diff --git a/pkg/front_end/test/spell_checking_list_tests.txt b/pkg/front_end/test/spell_checking_list_tests.txt
index 393b913f29b..9c10ad6201c 100644
--- a/pkg/front_end/test/spell_checking_list_tests.txt
+++ b/pkg/front_end/test/spell_checking_list_tests.txt
@@ -291,6 +291,7 @@ expansive
 explainer
 extern
 f\u
+fa
 fac
 faking
 falling
@@ -349,9 +350,12 @@ greeting
 gtgt
 gulp
 gunk
+ha
 hackish
 hardcoding
 hardly
+hb
+hc
 hest
 heuristics
 hi
@@ -411,6 +415,8 @@ ish
 it'll
 italic
 iter
+ja
+jc
 jlcontreras
 joo
 jumped
diff --git a/pkg/front_end/testcases/dart2js/inline_class/external.dart.strong.expect b/pkg/front_end/testcases/dart2js/inline_class/external.dart.strong.expect
index 476514e5872..4bd0577e7c7 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/external.dart.strong.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/external.dart.strong.expect
@@ -37,41 +37,41 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends self::B>(lowered final self::B #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends self::B>(T) → T
-  return <T extends self::B>(T t) → T => self::B|genericMethod<T>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|genericMethod<T extends self::B /* = self::A */>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends self::B /* = self::A */>(T) → T
+  return <T extends self::B /* = self::A */>(T t) → T => self::B|genericMethod<T>(#this, t);
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
-external static inline-class-member method B|staticGenericMethod<T extends self::B>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = self::B|(a);
-  self::B b2 = self::B|named(0);
+  self::B /* = self::A */ b1 = self::B|(a);
+  self::B /* = self::A */ b2 = self::B|named(0);
   a = self::B|get#field(b1);
   self::B|set#field(b1, a);
   a = self::B|method(b1);
-  b2 = self::B|genericMethod<self::B>(b2, b2);
+  b2 = self::B|genericMethod<self::B /* = self::A */>(b2, b2);
   b1 = self::B|get#getter(b2);
   self::B|set#setter(b1, b2);
   a = self::B|staticField;
   self::B|staticField = a;
   a = self::B|staticMethod();
-  b2 = self::B|staticGenericMethod<self::B>(b2);
+  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
   b1 = self::B|staticGetter;
   self::B|staticSetter = b2;
 }
diff --git a/pkg/front_end/testcases/dart2js/inline_class/external.dart.strong.transformed.expect b/pkg/front_end/testcases/dart2js/inline_class/external.dart.strong.transformed.expect
index cd0ee857940..c6b9fda9588 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/external.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/external.dart.strong.transformed.expect
@@ -38,43 +38,43 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
-  return js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
-  return js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), i);
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
+  return js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
+  return js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => js_2::_callMethodUnchecked0<self::A>(#this, "method");
-external static inline-class-member method B|genericMethod<T extends self::B>(lowered final self::B #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends self::B>(T) → T
-  return <T extends self::B>(T t) → T => js_2::callMethod<T>(#this, "genericMethod", <dynamic>[t]);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|genericMethod<T extends self::B /* = self::A */>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends self::B /* = self::A */>(T) → T
+  return <T extends self::B /* = self::A */>(T t) → T => js_2::callMethod<T>(#this, "genericMethod", <dynamic>[t]);
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
-external static inline-class-member method B|staticGenericMethod<T extends self::B>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
-  self::B b2 = js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), 0);
+  self::B /* = self::A */ b1 = js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
+  self::B /* = self::A */ b2 = js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), 0);
   a = js_2::getProperty<self::A>(b1, "field");
   js_2::setProperty<self::A>(b1, "field", a);
   a = js_2::_callMethodUnchecked0<self::A>(b1, "method");
-  b2 = js_2::callMethod<self::B>(b2, "genericMethod", <dynamic>[b2]);
-  b1 = js_2::getProperty<self::B>(b2, "getter");
-  js_2::setProperty<self::B>(b1, "setter", b2);
+  b2 = js_2::callMethod<self::B /* = self::A */>(b2, "genericMethod", <dynamic>[b2]);
+  b1 = js_2::getProperty<self::B /* = self::A */>(b2, "getter");
+  js_2::setProperty<self::B /* = self::A */>(b1, "setter", b2);
   a = js_2::getProperty<self::A>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticField");
   js_2::setProperty<self::A>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticField", a);
   a = js_2::_callMethodUnchecked0<self::A>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticMethod");
-  b2 = js_2::callMethod<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticGenericMethod", <dynamic>[b2]);
-  b1 = js_2::getProperty<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticGetter");
-  js_2::setProperty<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticSetter", b2);
+  b2 = js_2::callMethod<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticGenericMethod", <dynamic>[b2]);
+  b1 = js_2::getProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticGetter");
+  js_2::setProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticSetter", b2);
 }
 
 constants  {
diff --git a/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.expect b/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.expect
index 476514e5872..4bd0577e7c7 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.expect
@@ -37,41 +37,41 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends self::B>(lowered final self::B #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends self::B>(T) → T
-  return <T extends self::B>(T t) → T => self::B|genericMethod<T>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|genericMethod<T extends self::B /* = self::A */>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends self::B /* = self::A */>(T) → T
+  return <T extends self::B /* = self::A */>(T t) → T => self::B|genericMethod<T>(#this, t);
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
-external static inline-class-member method B|staticGenericMethod<T extends self::B>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = self::B|(a);
-  self::B b2 = self::B|named(0);
+  self::B /* = self::A */ b1 = self::B|(a);
+  self::B /* = self::A */ b2 = self::B|named(0);
   a = self::B|get#field(b1);
   self::B|set#field(b1, a);
   a = self::B|method(b1);
-  b2 = self::B|genericMethod<self::B>(b2, b2);
+  b2 = self::B|genericMethod<self::B /* = self::A */>(b2, b2);
   b1 = self::B|get#getter(b2);
   self::B|set#setter(b1, b2);
   a = self::B|staticField;
   self::B|staticField = a;
   a = self::B|staticMethod();
-  b2 = self::B|staticGenericMethod<self::B>(b2);
+  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
   b1 = self::B|staticGetter;
   self::B|staticSetter = b2;
 }
diff --git a/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.modular.expect b/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.modular.expect
index 476514e5872..4bd0577e7c7 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.modular.expect
@@ -37,41 +37,41 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends self::B>(lowered final self::B #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends self::B>(T) → T
-  return <T extends self::B>(T t) → T => self::B|genericMethod<T>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|genericMethod<T extends self::B /* = self::A */>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends self::B /* = self::A */>(T) → T
+  return <T extends self::B /* = self::A */>(T t) → T => self::B|genericMethod<T>(#this, t);
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
-external static inline-class-member method B|staticGenericMethod<T extends self::B>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = self::B|(a);
-  self::B b2 = self::B|named(0);
+  self::B /* = self::A */ b1 = self::B|(a);
+  self::B /* = self::A */ b2 = self::B|named(0);
   a = self::B|get#field(b1);
   self::B|set#field(b1, a);
   a = self::B|method(b1);
-  b2 = self::B|genericMethod<self::B>(b2, b2);
+  b2 = self::B|genericMethod<self::B /* = self::A */>(b2, b2);
   b1 = self::B|get#getter(b2);
   self::B|set#setter(b1, b2);
   a = self::B|staticField;
   self::B|staticField = a;
   a = self::B|staticMethod();
-  b2 = self::B|staticGenericMethod<self::B>(b2);
+  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
   b1 = self::B|staticGetter;
   self::B|staticSetter = b2;
 }
diff --git a/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.outline.expect b/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.outline.expect
index 71f7236fe5e..7015a9f5b75 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.outline.expect
@@ -36,28 +36,28 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends self::B>(lowered final self::B #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends self::B>(T) → T
-  return <T extends self::B>(T t) → T => self::B|genericMethod<T>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|genericMethod<T extends self::B /* = self::A */>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends self::B /* = self::A */>(T) → T
+  return <T extends self::B /* = self::A */>(T t) → T => self::B|genericMethod<T>(#this, t);
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
-external static inline-class-member method B|staticGenericMethod<T extends self::B>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void
   ;
 
diff --git a/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.transformed.expect b/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.transformed.expect
index cd0ee857940..c6b9fda9588 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.transformed.expect
@@ -38,43 +38,43 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
-  return js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
-  return js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), i);
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
+  return js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
+  return js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => js_2::_callMethodUnchecked0<self::A>(#this, "method");
-external static inline-class-member method B|genericMethod<T extends self::B>(lowered final self::B #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends self::B>(T) → T
-  return <T extends self::B>(T t) → T => js_2::callMethod<T>(#this, "genericMethod", <dynamic>[t]);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|genericMethod<T extends self::B /* = self::A */>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends self::B /* = self::A */>(T) → T
+  return <T extends self::B /* = self::A */>(T t) → T => js_2::callMethod<T>(#this, "genericMethod", <dynamic>[t]);
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
-external static inline-class-member method B|staticGenericMethod<T extends self::B>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
-  self::B b2 = js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), 0);
+  self::B /* = self::A */ b1 = js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
+  self::B /* = self::A */ b2 = js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), 0);
   a = js_2::getProperty<self::A>(b1, "field");
   js_2::setProperty<self::A>(b1, "field", a);
   a = js_2::_callMethodUnchecked0<self::A>(b1, "method");
-  b2 = js_2::callMethod<self::B>(b2, "genericMethod", <dynamic>[b2]);
-  b1 = js_2::getProperty<self::B>(b2, "getter");
-  js_2::setProperty<self::B>(b1, "setter", b2);
+  b2 = js_2::callMethod<self::B /* = self::A */>(b2, "genericMethod", <dynamic>[b2]);
+  b1 = js_2::getProperty<self::B /* = self::A */>(b2, "getter");
+  js_2::setProperty<self::B /* = self::A */>(b1, "setter", b2);
   a = js_2::getProperty<self::A>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticField");
   js_2::setProperty<self::A>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticField", a);
   a = js_2::_callMethodUnchecked0<self::A>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticMethod");
-  b2 = js_2::callMethod<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticGenericMethod", <dynamic>[b2]);
-  b1 = js_2::getProperty<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticGetter");
-  js_2::setProperty<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticSetter", b2);
+  b2 = js_2::callMethod<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticGenericMethod", <dynamic>[b2]);
+  b1 = js_2::getProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticGetter");
+  js_2::setProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticSetter", b2);
 }
 
 constants  {
diff --git a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.strong.expect b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.strong.expect
index 5b15c989ea7..04ecd65685d 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.strong.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.strong.expect
@@ -18,40 +18,40 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method J|_(core::int i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(core::int i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.strong.transformed.expect b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.strong.transformed.expect
index 5b15c989ea7..04ecd65685d 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.strong.transformed.expect
@@ -18,40 +18,40 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method J|_(core::int i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(core::int i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.expect b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.expect
index 8bb96fd5ab2..415dbdd774d 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.expect
@@ -18,40 +18,40 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method J|_(core::int i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(core::int i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.modular.expect b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.modular.expect
index 8bb96fd5ab2..415dbdd774d 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.modular.expect
@@ -18,40 +18,40 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method J|_(core::int i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(core::int i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.outline.expect b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.outline.expect
index a12caa52c2e..74a17bc5f71 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.outline.expect
@@ -18,25 +18,25 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static inline-class-member method I|() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
   ;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   ;
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method J|_(core::int i) → self::J
+static inline-class-member method J|_(core::int i) → self::J /* = core::int */
   ;
-static inline-class-member method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   ;
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%>
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> /* = self::K|_::T% */
   ;
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.transformed.expect b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.transformed.expect
index 8bb96fd5ab2..415dbdd774d 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.transformed.expect
@@ -18,40 +18,40 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method J|_(core::int i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(core::int i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.strong.expect b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.strong.expect
index 476514e5872..4bd0577e7c7 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.strong.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.strong.expect
@@ -37,41 +37,41 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends self::B>(lowered final self::B #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends self::B>(T) → T
-  return <T extends self::B>(T t) → T => self::B|genericMethod<T>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|genericMethod<T extends self::B /* = self::A */>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends self::B /* = self::A */>(T) → T
+  return <T extends self::B /* = self::A */>(T t) → T => self::B|genericMethod<T>(#this, t);
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
-external static inline-class-member method B|staticGenericMethod<T extends self::B>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = self::B|(a);
-  self::B b2 = self::B|named(0);
+  self::B /* = self::A */ b1 = self::B|(a);
+  self::B /* = self::A */ b2 = self::B|named(0);
   a = self::B|get#field(b1);
   self::B|set#field(b1, a);
   a = self::B|method(b1);
-  b2 = self::B|genericMethod<self::B>(b2, b2);
+  b2 = self::B|genericMethod<self::B /* = self::A */>(b2, b2);
   b1 = self::B|get#getter(b2);
   self::B|set#setter(b1, b2);
   a = self::B|staticField;
   self::B|staticField = a;
   a = self::B|staticMethod();
-  b2 = self::B|staticGenericMethod<self::B>(b2);
+  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
   b1 = self::B|staticGetter;
   self::B|staticSetter = b2;
 }
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.strong.transformed.expect b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.strong.transformed.expect
index cd0ee857940..c6b9fda9588 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.strong.transformed.expect
@@ -38,43 +38,43 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
-  return js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
-  return js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), i);
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
+  return js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
+  return js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => js_2::_callMethodUnchecked0<self::A>(#this, "method");
-external static inline-class-member method B|genericMethod<T extends self::B>(lowered final self::B #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends self::B>(T) → T
-  return <T extends self::B>(T t) → T => js_2::callMethod<T>(#this, "genericMethod", <dynamic>[t]);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|genericMethod<T extends self::B /* = self::A */>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends self::B /* = self::A */>(T) → T
+  return <T extends self::B /* = self::A */>(T t) → T => js_2::callMethod<T>(#this, "genericMethod", <dynamic>[t]);
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
-external static inline-class-member method B|staticGenericMethod<T extends self::B>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
-  self::B b2 = js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), 0);
+  self::B /* = self::A */ b1 = js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
+  self::B /* = self::A */ b2 = js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), 0);
   a = js_2::getProperty<self::A>(b1, "field");
   js_2::setProperty<self::A>(b1, "field", a);
   a = js_2::_callMethodUnchecked0<self::A>(b1, "method");
-  b2 = js_2::callMethod<self::B>(b2, "genericMethod", <dynamic>[b2]);
-  b1 = js_2::getProperty<self::B>(b2, "getter");
-  js_2::setProperty<self::B>(b1, "setter", b2);
+  b2 = js_2::callMethod<self::B /* = self::A */>(b2, "genericMethod", <dynamic>[b2]);
+  b1 = js_2::getProperty<self::B /* = self::A */>(b2, "getter");
+  js_2::setProperty<self::B /* = self::A */>(b1, "setter", b2);
   a = js_2::getProperty<self::A>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticField");
   js_2::setProperty<self::A>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticField", a);
   a = js_2::_callMethodUnchecked0<self::A>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticMethod");
-  b2 = js_2::callMethod<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticGenericMethod", <dynamic>[b2]);
-  b1 = js_2::getProperty<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticGetter");
-  js_2::setProperty<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticSetter", b2);
+  b2 = js_2::callMethod<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticGenericMethod", <dynamic>[b2]);
+  b1 = js_2::getProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticGetter");
+  js_2::setProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticSetter", b2);
 }
 
 constants  {
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.expect b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.expect
index 476514e5872..4bd0577e7c7 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.expect
@@ -37,41 +37,41 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends self::B>(lowered final self::B #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends self::B>(T) → T
-  return <T extends self::B>(T t) → T => self::B|genericMethod<T>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|genericMethod<T extends self::B /* = self::A */>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends self::B /* = self::A */>(T) → T
+  return <T extends self::B /* = self::A */>(T t) → T => self::B|genericMethod<T>(#this, t);
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
-external static inline-class-member method B|staticGenericMethod<T extends self::B>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = self::B|(a);
-  self::B b2 = self::B|named(0);
+  self::B /* = self::A */ b1 = self::B|(a);
+  self::B /* = self::A */ b2 = self::B|named(0);
   a = self::B|get#field(b1);
   self::B|set#field(b1, a);
   a = self::B|method(b1);
-  b2 = self::B|genericMethod<self::B>(b2, b2);
+  b2 = self::B|genericMethod<self::B /* = self::A */>(b2, b2);
   b1 = self::B|get#getter(b2);
   self::B|set#setter(b1, b2);
   a = self::B|staticField;
   self::B|staticField = a;
   a = self::B|staticMethod();
-  b2 = self::B|staticGenericMethod<self::B>(b2);
+  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
   b1 = self::B|staticGetter;
   self::B|staticSetter = b2;
 }
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.modular.expect b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.modular.expect
index 476514e5872..4bd0577e7c7 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.modular.expect
@@ -37,41 +37,41 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends self::B>(lowered final self::B #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends self::B>(T) → T
-  return <T extends self::B>(T t) → T => self::B|genericMethod<T>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|genericMethod<T extends self::B /* = self::A */>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends self::B /* = self::A */>(T) → T
+  return <T extends self::B /* = self::A */>(T t) → T => self::B|genericMethod<T>(#this, t);
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
-external static inline-class-member method B|staticGenericMethod<T extends self::B>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = self::B|(a);
-  self::B b2 = self::B|named(0);
+  self::B /* = self::A */ b1 = self::B|(a);
+  self::B /* = self::A */ b2 = self::B|named(0);
   a = self::B|get#field(b1);
   self::B|set#field(b1, a);
   a = self::B|method(b1);
-  b2 = self::B|genericMethod<self::B>(b2, b2);
+  b2 = self::B|genericMethod<self::B /* = self::A */>(b2, b2);
   b1 = self::B|get#getter(b2);
   self::B|set#setter(b1, b2);
   a = self::B|staticField;
   self::B|staticField = a;
   a = self::B|staticMethod();
-  b2 = self::B|staticGenericMethod<self::B>(b2);
+  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
   b1 = self::B|staticGetter;
   self::B|staticSetter = b2;
 }
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.outline.expect b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.outline.expect
index e521f766882..144b6b4bbcb 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.outline.expect
@@ -36,28 +36,28 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends self::B>(lowered final self::B #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends self::B>(T) → T
-  return <T extends self::B>(T t) → T => self::B|genericMethod<T>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|genericMethod<T extends self::B /* = self::A */>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends self::B /* = self::A */>(T) → T
+  return <T extends self::B /* = self::A */>(T t) → T => self::B|genericMethod<T>(#this, t);
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
-external static inline-class-member method B|staticGenericMethod<T extends self::B>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void
   ;
 
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.transformed.expect b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.transformed.expect
index cd0ee857940..c6b9fda9588 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.transformed.expect
@@ -38,43 +38,43 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
-  return js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
-  return js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), i);
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
+  return js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
+  return js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => js_2::_callMethodUnchecked0<self::A>(#this, "method");
-external static inline-class-member method B|genericMethod<T extends self::B>(lowered final self::B #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends self::B>(T) → T
-  return <T extends self::B>(T t) → T => js_2::callMethod<T>(#this, "genericMethod", <dynamic>[t]);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|genericMethod<T extends self::B /* = self::A */>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends self::B /* = self::A */>(T) → T
+  return <T extends self::B /* = self::A */>(T t) → T => js_2::callMethod<T>(#this, "genericMethod", <dynamic>[t]);
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
-external static inline-class-member method B|staticGenericMethod<T extends self::B>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T t) → self::B|staticGenericMethod::T;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
-  self::B b2 = js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), 0);
+  self::B /* = self::A */ b1 = js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
+  self::B /* = self::A */ b2 = js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), 0);
   a = js_2::getProperty<self::A>(b1, "field");
   js_2::setProperty<self::A>(b1, "field", a);
   a = js_2::_callMethodUnchecked0<self::A>(b1, "method");
-  b2 = js_2::callMethod<self::B>(b2, "genericMethod", <dynamic>[b2]);
-  b1 = js_2::getProperty<self::B>(b2, "getter");
-  js_2::setProperty<self::B>(b1, "setter", b2);
+  b2 = js_2::callMethod<self::B /* = self::A */>(b2, "genericMethod", <dynamic>[b2]);
+  b1 = js_2::getProperty<self::B /* = self::A */>(b2, "getter");
+  js_2::setProperty<self::B /* = self::A */>(b1, "setter", b2);
   a = js_2::getProperty<self::A>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticField");
   js_2::setProperty<self::A>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticField", a);
   a = js_2::_callMethodUnchecked0<self::A>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticMethod");
-  b2 = js_2::callMethod<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticGenericMethod", <dynamic>[b2]);
-  b1 = js_2::getProperty<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticGetter");
-  js_2::setProperty<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticSetter", b2);
+  b2 = js_2::callMethod<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticGenericMethod", <dynamic>[b2]);
+  b1 = js_2::getProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticGetter");
+  js_2::setProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), "staticSetter", b2);
 }
 
 constants  {
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.strong.expect b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.strong.expect
index 5b15c989ea7..04ecd65685d 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.strong.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.strong.expect
@@ -18,40 +18,40 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method J|_(core::int i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(core::int i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.strong.transformed.expect b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.strong.transformed.expect
index 5b15c989ea7..04ecd65685d 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.strong.transformed.expect
@@ -18,40 +18,40 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method J|_(core::int i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(core::int i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.expect b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.expect
index 8bb96fd5ab2..415dbdd774d 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.expect
@@ -18,40 +18,40 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method J|_(core::int i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(core::int i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.modular.expect b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.modular.expect
index 8bb96fd5ab2..415dbdd774d 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.modular.expect
@@ -18,40 +18,40 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method J|_(core::int i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(core::int i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.outline.expect b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.outline.expect
index a12caa52c2e..74a17bc5f71 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.outline.expect
@@ -18,25 +18,25 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static inline-class-member method I|() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
   ;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   ;
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method J|_(core::int i) → self::J
+static inline-class-member method J|_(core::int i) → self::J /* = core::int */
   ;
-static inline-class-member method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   ;
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%>
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> /* = self::K|_::T% */
   ;
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.transformed.expect b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.transformed.expect
index 8bb96fd5ab2..415dbdd774d 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.transformed.expect
@@ -18,40 +18,40 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method J|_(core::int i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(core::int i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/inline_class/annotations.dart.strong.expect b/pkg/front_end/testcases/inline_class/annotations.dart.strong.expect
index 7e8714a7524..e2254bf7562 100644
--- a/pkg/front_end/testcases/inline_class/annotations.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/annotations.dart.strong.expect
@@ -10,15 +10,15 @@ extension type A(core::int i) {
   tearoff • = self::A|_#new#tearOff;
 }
 @#C2
-static inline-class-member method A|(core::int i) → self::A {
-  lowered final self::A #this = i;
+static inline-class-member method A|(core::int i) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(core::int i) → self::A
+static inline-class-member method A|_#new#tearOff(core::int i) → self::A /* = core::int */
   return self::A|(i);
 @#C2
-static inline-class-member method A|m(lowered final self::A #this) → void {}
-static inline-class-member method A|get#m(lowered final self::A #this) → () → void
+static inline-class-member method A|m(lowered final self::A /* = core::int */ #this) → void {}
+static inline-class-member method A|get#m(lowered final self::A /* = core::int */ #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/annotations.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/annotations.dart.strong.transformed.expect
index 7e8714a7524..e2254bf7562 100644
--- a/pkg/front_end/testcases/inline_class/annotations.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/annotations.dart.strong.transformed.expect
@@ -10,15 +10,15 @@ extension type A(core::int i) {
   tearoff • = self::A|_#new#tearOff;
 }
 @#C2
-static inline-class-member method A|(core::int i) → self::A {
-  lowered final self::A #this = i;
+static inline-class-member method A|(core::int i) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(core::int i) → self::A
+static inline-class-member method A|_#new#tearOff(core::int i) → self::A /* = core::int */
   return self::A|(i);
 @#C2
-static inline-class-member method A|m(lowered final self::A #this) → void {}
-static inline-class-member method A|get#m(lowered final self::A #this) → () → void
+static inline-class-member method A|m(lowered final self::A /* = core::int */ #this) → void {}
+static inline-class-member method A|get#m(lowered final self::A /* = core::int */ #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/annotations.dart.weak.expect b/pkg/front_end/testcases/inline_class/annotations.dart.weak.expect
index 7e8714a7524..e2254bf7562 100644
--- a/pkg/front_end/testcases/inline_class/annotations.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/annotations.dart.weak.expect
@@ -10,15 +10,15 @@ extension type A(core::int i) {
   tearoff • = self::A|_#new#tearOff;
 }
 @#C2
-static inline-class-member method A|(core::int i) → self::A {
-  lowered final self::A #this = i;
+static inline-class-member method A|(core::int i) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(core::int i) → self::A
+static inline-class-member method A|_#new#tearOff(core::int i) → self::A /* = core::int */
   return self::A|(i);
 @#C2
-static inline-class-member method A|m(lowered final self::A #this) → void {}
-static inline-class-member method A|get#m(lowered final self::A #this) → () → void
+static inline-class-member method A|m(lowered final self::A /* = core::int */ #this) → void {}
+static inline-class-member method A|get#m(lowered final self::A /* = core::int */ #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/annotations.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/annotations.dart.weak.modular.expect
index 7e8714a7524..e2254bf7562 100644
--- a/pkg/front_end/testcases/inline_class/annotations.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/annotations.dart.weak.modular.expect
@@ -10,15 +10,15 @@ extension type A(core::int i) {
   tearoff • = self::A|_#new#tearOff;
 }
 @#C2
-static inline-class-member method A|(core::int i) → self::A {
-  lowered final self::A #this = i;
+static inline-class-member method A|(core::int i) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(core::int i) → self::A
+static inline-class-member method A|_#new#tearOff(core::int i) → self::A /* = core::int */
   return self::A|(i);
 @#C2
-static inline-class-member method A|m(lowered final self::A #this) → void {}
-static inline-class-member method A|get#m(lowered final self::A #this) → () → void
+static inline-class-member method A|m(lowered final self::A /* = core::int */ #this) → void {}
+static inline-class-member method A|get#m(lowered final self::A /* = core::int */ #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/annotations.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/annotations.dart.weak.outline.expect
index 20d4b04c0a7..90dd0f74941 100644
--- a/pkg/front_end/testcases/inline_class/annotations.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/annotations.dart.weak.outline.expect
@@ -10,14 +10,14 @@ extension type A(core::int i) {
   tearoff • = self::A|_#new#tearOff;
 }
 @core::Deprecated::•("")
-static inline-class-member method A|(core::int i) → self::A
+static inline-class-member method A|(core::int i) → self::A /* = core::int */
   ;
-static inline-class-member method A|_#new#tearOff(core::int i) → self::A
+static inline-class-member method A|_#new#tearOff(core::int i) → self::A /* = core::int */
   return self::A|(i);
 @core::Deprecated::•("")
-static inline-class-member method A|m(lowered final self::A #this) → void
+static inline-class-member method A|m(lowered final self::A /* = core::int */ #this) → void
   ;
-static inline-class-member method A|get#m(lowered final self::A #this) → () → void
+static inline-class-member method A|get#m(lowered final self::A /* = core::int */ #this) → () → void
   return () → void => self::A|m(#this);
 
 
diff --git a/pkg/front_end/testcases/inline_class/annotations.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/annotations.dart.weak.transformed.expect
index 7e8714a7524..e2254bf7562 100644
--- a/pkg/front_end/testcases/inline_class/annotations.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/annotations.dart.weak.transformed.expect
@@ -10,15 +10,15 @@ extension type A(core::int i) {
   tearoff • = self::A|_#new#tearOff;
 }
 @#C2
-static inline-class-member method A|(core::int i) → self::A {
-  lowered final self::A #this = i;
+static inline-class-member method A|(core::int i) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(core::int i) → self::A
+static inline-class-member method A|_#new#tearOff(core::int i) → self::A /* = core::int */
   return self::A|(i);
 @#C2
-static inline-class-member method A|m(lowered final self::A #this) → void {}
-static inline-class-member method A|get#m(lowered final self::A #this) → () → void
+static inline-class-member method A|m(lowered final self::A /* = core::int */ #this) → void {}
+static inline-class-member method A|get#m(lowered final self::A /* = core::int */ #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/const_constructor.dart.strong.expect b/pkg/front_end/testcases/inline_class/const_constructor.dart.strong.expect
index 22dd6ce9e15..b8a2742867d 100644
--- a/pkg/front_end/testcases/inline_class/const_constructor.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/const_constructor.dart.strong.expect
@@ -32,29 +32,29 @@ extension type Class(core::int i) {
   static redirecting-factory redirect2 = self::Class|redirect2;
   static tearoff redirect2 = self::Class|_#redirect2#tearOff;
 }
-static inline-class-member method Class|(core::int i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|(core::int i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#new#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|named(core::int i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|named(core::int i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|named(i);
-static inline-class-member method Class|redirect(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|fact(core::int i) → self::Class
+static inline-class-member method Class|fact(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|fact(i);
-static inline-class-member method Class|redirect2(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect2(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/const_constructor.dart:20:9: Error: Cannot invoke a non-'const' constructor where a const expression is expected.
diff --git a/pkg/front_end/testcases/inline_class/const_constructor.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/const_constructor.dart.strong.transformed.expect
index 22dd6ce9e15..b8a2742867d 100644
--- a/pkg/front_end/testcases/inline_class/const_constructor.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/const_constructor.dart.strong.transformed.expect
@@ -32,29 +32,29 @@ extension type Class(core::int i) {
   static redirecting-factory redirect2 = self::Class|redirect2;
   static tearoff redirect2 = self::Class|_#redirect2#tearOff;
 }
-static inline-class-member method Class|(core::int i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|(core::int i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#new#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|named(core::int i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|named(core::int i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|named(i);
-static inline-class-member method Class|redirect(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|fact(core::int i) → self::Class
+static inline-class-member method Class|fact(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|fact(i);
-static inline-class-member method Class|redirect2(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect2(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/const_constructor.dart:20:9: Error: Cannot invoke a non-'const' constructor where a const expression is expected.
diff --git a/pkg/front_end/testcases/inline_class/const_constructor.dart.weak.expect b/pkg/front_end/testcases/inline_class/const_constructor.dart.weak.expect
index 22dd6ce9e15..b8a2742867d 100644
--- a/pkg/front_end/testcases/inline_class/const_constructor.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/const_constructor.dart.weak.expect
@@ -32,29 +32,29 @@ extension type Class(core::int i) {
   static redirecting-factory redirect2 = self::Class|redirect2;
   static tearoff redirect2 = self::Class|_#redirect2#tearOff;
 }
-static inline-class-member method Class|(core::int i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|(core::int i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#new#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|named(core::int i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|named(core::int i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|named(i);
-static inline-class-member method Class|redirect(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|fact(core::int i) → self::Class
+static inline-class-member method Class|fact(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|fact(i);
-static inline-class-member method Class|redirect2(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect2(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/const_constructor.dart:20:9: Error: Cannot invoke a non-'const' constructor where a const expression is expected.
diff --git a/pkg/front_end/testcases/inline_class/const_constructor.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/const_constructor.dart.weak.modular.expect
index 22dd6ce9e15..b8a2742867d 100644
--- a/pkg/front_end/testcases/inline_class/const_constructor.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/const_constructor.dart.weak.modular.expect
@@ -32,29 +32,29 @@ extension type Class(core::int i) {
   static redirecting-factory redirect2 = self::Class|redirect2;
   static tearoff redirect2 = self::Class|_#redirect2#tearOff;
 }
-static inline-class-member method Class|(core::int i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|(core::int i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#new#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|named(core::int i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|named(core::int i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|named(i);
-static inline-class-member method Class|redirect(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|fact(core::int i) → self::Class
+static inline-class-member method Class|fact(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|fact(i);
-static inline-class-member method Class|redirect2(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect2(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/const_constructor.dart:20:9: Error: Cannot invoke a non-'const' constructor where a const expression is expected.
diff --git a/pkg/front_end/testcases/inline_class/const_constructor.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/const_constructor.dart.weak.outline.expect
index d3de92d0744..68786b110ad 100644
--- a/pkg/front_end/testcases/inline_class/const_constructor.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/const_constructor.dart.weak.outline.expect
@@ -14,25 +14,25 @@ extension type Class(core::int i) {
   static redirecting-factory redirect2 = self::Class|redirect2;
   static tearoff redirect2 = self::Class|_#redirect2#tearOff;
 }
-static inline-class-member method Class|(core::int i) → self::Class
+static inline-class-member method Class|(core::int i) → self::Class /* = core::int */
   ;
-static inline-class-member method Class|_#new#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#new#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|named(core::int i) → self::Class
+static inline-class-member method Class|named(core::int i) → self::Class /* = core::int */
   ;
-static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|named(i);
-static inline-class-member method Class|redirect(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|fact(core::int i) → self::Class
+static inline-class-member method Class|fact(core::int i) → self::Class /* = core::int */
   ;
-static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|fact(i);
-static inline-class-member method Class|redirect2(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect2(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
 static method test() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/const_constructor.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/const_constructor.dart.weak.transformed.expect
index 22dd6ce9e15..b8a2742867d 100644
--- a/pkg/front_end/testcases/inline_class/const_constructor.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/const_constructor.dart.weak.transformed.expect
@@ -32,29 +32,29 @@ extension type Class(core::int i) {
   static redirecting-factory redirect2 = self::Class|redirect2;
   static tearoff redirect2 = self::Class|_#redirect2#tearOff;
 }
-static inline-class-member method Class|(core::int i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|(core::int i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#new#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|named(core::int i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|named(core::int i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|named(i);
-static inline-class-member method Class|redirect(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|fact(core::int i) → self::Class
+static inline-class-member method Class|fact(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|fact(i);
-static inline-class-member method Class|redirect2(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect2(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/const_constructor.dart:20:9: Error: Cannot invoke a non-'const' constructor where a const expression is expected.
diff --git a/pkg/front_end/testcases/inline_class/constructor_access.dart.strong.expect b/pkg/front_end/testcases/inline_class/constructor_access.dart.strong.expect
index 3522022976f..26d1582ceaf 100644
--- a/pkg/front_end/testcases/inline_class/constructor_access.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_access.dart.strong.expect
@@ -12,43 +12,43 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::GenericClass|;
   tearoff • = self::GenericClass|_#new#tearOff;
 }
-static inline-class-member method Class|(core::int it) → self::Class {
-  lowered final self::Class #this = it;
+static inline-class-member method Class|(core::int it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#new#tearOff(core::int it) → self::Class /* = core::int */
   return self::Class|(it);
-static inline-class-member method Class|named(core::int it) → self::Class {
-  lowered final self::Class #this = it.{core::num::+}(1){(core::num) → core::int};
+static inline-class-member method Class|named(core::int it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class /* = core::int */
   return self::Class|named(it);
-static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> {
-  lowered final self::GenericClass<self::GenericClass|::T%> #this = it;
+static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ {
+  lowered final self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
+static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%> /* = self::GenericClass|_#new#tearOff::T% */
   return self::GenericClass|<self::GenericClass|_#new#tearOff::T%>(it);
 static method main() → dynamic {
-  self::Class a = self::Class|(3);
-  self::Class b = self::Class|(4);
-  self::Class b2 = #C1(4){(core::int) → self::Class};
-  self::Class c = self::Class|named(5);
-  self::Class c2 = #C2(5){(core::int) → self::Class};
-  self::GenericClass<core::String> d = self::GenericClass|<core::String>("foo");
-  self::GenericClass<core::String> d2 = #C4("foo"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> d3 = #C3<core::String>("foo"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e = self::GenericClass|<core::String>("bar");
-  self::GenericClass<core::String> e2 = #C4("bar"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e3 = #C3<core::String>("bar"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::int> f = self::GenericClass|<core::int>(42);
-  self::GenericClass<core::int> f2 = #C5(42){(core::int) → self::GenericClass<core::int>};
-  self::GenericClass<core::int> f3 = #C3<core::int>(42){(core::int) → self::GenericClass<core::int>};
-  self::GenericClass<core::int> g = self::GenericClass|<core::int>(87);
-  self::GenericClass<core::int> g2 = #C3<core::int>(87){(core::int) → self::GenericClass<core::int>};
-  self::GenericClass<core::num> h = self::GenericClass|<core::num>(123);
-  self::GenericClass<core::num> h2 = #C3<core::num>(123){(core::num) → self::GenericClass<core::num>};
+  self::Class /* = core::int */ a = self::Class|(3);
+  self::Class /* = core::int */ b = self::Class|(4);
+  self::Class /* = core::int */ b2 = #C1(4){(core::int) → self::Class /* = core::int */};
+  self::Class /* = core::int */ c = self::Class|named(5);
+  self::Class /* = core::int */ c2 = #C2(5){(core::int) → self::Class /* = core::int */};
+  self::GenericClass<core::String> /* = core::String */ d = self::GenericClass|<core::String>("foo");
+  self::GenericClass<core::String> /* = core::String */ d2 = #C4("foo"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ d3 = #C3<core::String>("foo"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e = self::GenericClass|<core::String>("bar");
+  self::GenericClass<core::String> /* = core::String */ e2 = #C4("bar"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e3 = #C3<core::String>("bar"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::int> /* = core::int */ f = self::GenericClass|<core::int>(42);
+  self::GenericClass<core::int> /* = core::int */ f2 = #C5(42){(core::int) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::int> /* = core::int */ f3 = #C3<core::int>(42){(core::int) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::int> /* = core::int */ g = self::GenericClass|<core::int>(87);
+  self::GenericClass<core::int> /* = core::int */ g2 = #C3<core::int>(87){(core::int) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::num> /* = core::num */ h = self::GenericClass|<core::num>(123);
+  self::GenericClass<core::num> /* = core::num */ h2 = #C3<core::num>(123){(core::num) → self::GenericClass<core::num> /* = core::num */};
   self::expect(3, a as{Unchecked} core::int);
   self::expect(3, a);
   self::expect(4, b as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/constructor_access.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/constructor_access.dart.strong.transformed.expect
index 3522022976f..26d1582ceaf 100644
--- a/pkg/front_end/testcases/inline_class/constructor_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_access.dart.strong.transformed.expect
@@ -12,43 +12,43 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::GenericClass|;
   tearoff • = self::GenericClass|_#new#tearOff;
 }
-static inline-class-member method Class|(core::int it) → self::Class {
-  lowered final self::Class #this = it;
+static inline-class-member method Class|(core::int it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#new#tearOff(core::int it) → self::Class /* = core::int */
   return self::Class|(it);
-static inline-class-member method Class|named(core::int it) → self::Class {
-  lowered final self::Class #this = it.{core::num::+}(1){(core::num) → core::int};
+static inline-class-member method Class|named(core::int it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class /* = core::int */
   return self::Class|named(it);
-static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> {
-  lowered final self::GenericClass<self::GenericClass|::T%> #this = it;
+static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ {
+  lowered final self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
+static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%> /* = self::GenericClass|_#new#tearOff::T% */
   return self::GenericClass|<self::GenericClass|_#new#tearOff::T%>(it);
 static method main() → dynamic {
-  self::Class a = self::Class|(3);
-  self::Class b = self::Class|(4);
-  self::Class b2 = #C1(4){(core::int) → self::Class};
-  self::Class c = self::Class|named(5);
-  self::Class c2 = #C2(5){(core::int) → self::Class};
-  self::GenericClass<core::String> d = self::GenericClass|<core::String>("foo");
-  self::GenericClass<core::String> d2 = #C4("foo"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> d3 = #C3<core::String>("foo"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e = self::GenericClass|<core::String>("bar");
-  self::GenericClass<core::String> e2 = #C4("bar"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e3 = #C3<core::String>("bar"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::int> f = self::GenericClass|<core::int>(42);
-  self::GenericClass<core::int> f2 = #C5(42){(core::int) → self::GenericClass<core::int>};
-  self::GenericClass<core::int> f3 = #C3<core::int>(42){(core::int) → self::GenericClass<core::int>};
-  self::GenericClass<core::int> g = self::GenericClass|<core::int>(87);
-  self::GenericClass<core::int> g2 = #C3<core::int>(87){(core::int) → self::GenericClass<core::int>};
-  self::GenericClass<core::num> h = self::GenericClass|<core::num>(123);
-  self::GenericClass<core::num> h2 = #C3<core::num>(123){(core::num) → self::GenericClass<core::num>};
+  self::Class /* = core::int */ a = self::Class|(3);
+  self::Class /* = core::int */ b = self::Class|(4);
+  self::Class /* = core::int */ b2 = #C1(4){(core::int) → self::Class /* = core::int */};
+  self::Class /* = core::int */ c = self::Class|named(5);
+  self::Class /* = core::int */ c2 = #C2(5){(core::int) → self::Class /* = core::int */};
+  self::GenericClass<core::String> /* = core::String */ d = self::GenericClass|<core::String>("foo");
+  self::GenericClass<core::String> /* = core::String */ d2 = #C4("foo"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ d3 = #C3<core::String>("foo"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e = self::GenericClass|<core::String>("bar");
+  self::GenericClass<core::String> /* = core::String */ e2 = #C4("bar"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e3 = #C3<core::String>("bar"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::int> /* = core::int */ f = self::GenericClass|<core::int>(42);
+  self::GenericClass<core::int> /* = core::int */ f2 = #C5(42){(core::int) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::int> /* = core::int */ f3 = #C3<core::int>(42){(core::int) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::int> /* = core::int */ g = self::GenericClass|<core::int>(87);
+  self::GenericClass<core::int> /* = core::int */ g2 = #C3<core::int>(87){(core::int) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::num> /* = core::num */ h = self::GenericClass|<core::num>(123);
+  self::GenericClass<core::num> /* = core::num */ h2 = #C3<core::num>(123){(core::num) → self::GenericClass<core::num> /* = core::num */};
   self::expect(3, a as{Unchecked} core::int);
   self::expect(3, a);
   self::expect(4, b as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.expect b/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.expect
index 64868a06ad4..8836c1c123d 100644
--- a/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.expect
@@ -12,43 +12,43 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::GenericClass|;
   tearoff • = self::GenericClass|_#new#tearOff;
 }
-static inline-class-member method Class|(core::int it) → self::Class {
-  lowered final self::Class #this = it;
+static inline-class-member method Class|(core::int it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#new#tearOff(core::int it) → self::Class /* = core::int */
   return self::Class|(it);
-static inline-class-member method Class|named(core::int it) → self::Class {
-  lowered final self::Class #this = it.{core::num::+}(1){(core::num) → core::int};
+static inline-class-member method Class|named(core::int it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class /* = core::int */
   return self::Class|named(it);
-static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> {
-  lowered final self::GenericClass<self::GenericClass|::T%> #this = it;
+static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ {
+  lowered final self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
+static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%> /* = self::GenericClass|_#new#tearOff::T% */
   return self::GenericClass|<self::GenericClass|_#new#tearOff::T%>(it);
 static method main() → dynamic {
-  self::Class a = self::Class|(3);
-  self::Class b = self::Class|(4);
-  self::Class b2 = #C1(4){(core::int) → self::Class};
-  self::Class c = self::Class|named(5);
-  self::Class c2 = #C2(5){(core::int) → self::Class};
-  self::GenericClass<core::String> d = self::GenericClass|<core::String>("foo");
-  self::GenericClass<core::String> d2 = #C4("foo"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> d3 = #C3<core::String>("foo"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e = self::GenericClass|<core::String>("bar");
-  self::GenericClass<core::String> e2 = #C4("bar"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e3 = #C3<core::String>("bar"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::int> f = self::GenericClass|<core::int>(42);
-  self::GenericClass<core::int> f2 = #C5(42){(core::int) → self::GenericClass<core::int>};
-  self::GenericClass<core::int> f3 = #C3<core::int>(42){(core::int) → self::GenericClass<core::int>};
-  self::GenericClass<core::int> g = self::GenericClass|<core::int>(87);
-  self::GenericClass<core::int> g2 = #C3<core::int>(87){(core::int) → self::GenericClass<core::int>};
-  self::GenericClass<core::num> h = self::GenericClass|<core::num>(123);
-  self::GenericClass<core::num> h2 = #C3<core::num>(123){(core::num) → self::GenericClass<core::num>};
+  self::Class /* = core::int */ a = self::Class|(3);
+  self::Class /* = core::int */ b = self::Class|(4);
+  self::Class /* = core::int */ b2 = #C1(4){(core::int) → self::Class /* = core::int */};
+  self::Class /* = core::int */ c = self::Class|named(5);
+  self::Class /* = core::int */ c2 = #C2(5){(core::int) → self::Class /* = core::int */};
+  self::GenericClass<core::String> /* = core::String */ d = self::GenericClass|<core::String>("foo");
+  self::GenericClass<core::String> /* = core::String */ d2 = #C4("foo"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ d3 = #C3<core::String>("foo"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e = self::GenericClass|<core::String>("bar");
+  self::GenericClass<core::String> /* = core::String */ e2 = #C4("bar"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e3 = #C3<core::String>("bar"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::int> /* = core::int */ f = self::GenericClass|<core::int>(42);
+  self::GenericClass<core::int> /* = core::int */ f2 = #C5(42){(core::int) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::int> /* = core::int */ f3 = #C3<core::int>(42){(core::int) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::int> /* = core::int */ g = self::GenericClass|<core::int>(87);
+  self::GenericClass<core::int> /* = core::int */ g2 = #C3<core::int>(87){(core::int) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::num> /* = core::num */ h = self::GenericClass|<core::num>(123);
+  self::GenericClass<core::num> /* = core::num */ h2 = #C3<core::num>(123){(core::num) → self::GenericClass<core::num> /* = core::num */};
   self::expect(3, a as{Unchecked} core::int);
   self::expect(3, a);
   self::expect(4, b as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.modular.expect
index 64868a06ad4..8836c1c123d 100644
--- a/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.modular.expect
@@ -12,43 +12,43 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::GenericClass|;
   tearoff • = self::GenericClass|_#new#tearOff;
 }
-static inline-class-member method Class|(core::int it) → self::Class {
-  lowered final self::Class #this = it;
+static inline-class-member method Class|(core::int it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#new#tearOff(core::int it) → self::Class /* = core::int */
   return self::Class|(it);
-static inline-class-member method Class|named(core::int it) → self::Class {
-  lowered final self::Class #this = it.{core::num::+}(1){(core::num) → core::int};
+static inline-class-member method Class|named(core::int it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class /* = core::int */
   return self::Class|named(it);
-static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> {
-  lowered final self::GenericClass<self::GenericClass|::T%> #this = it;
+static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ {
+  lowered final self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
+static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%> /* = self::GenericClass|_#new#tearOff::T% */
   return self::GenericClass|<self::GenericClass|_#new#tearOff::T%>(it);
 static method main() → dynamic {
-  self::Class a = self::Class|(3);
-  self::Class b = self::Class|(4);
-  self::Class b2 = #C1(4){(core::int) → self::Class};
-  self::Class c = self::Class|named(5);
-  self::Class c2 = #C2(5){(core::int) → self::Class};
-  self::GenericClass<core::String> d = self::GenericClass|<core::String>("foo");
-  self::GenericClass<core::String> d2 = #C4("foo"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> d3 = #C3<core::String>("foo"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e = self::GenericClass|<core::String>("bar");
-  self::GenericClass<core::String> e2 = #C4("bar"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e3 = #C3<core::String>("bar"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::int> f = self::GenericClass|<core::int>(42);
-  self::GenericClass<core::int> f2 = #C5(42){(core::int) → self::GenericClass<core::int>};
-  self::GenericClass<core::int> f3 = #C3<core::int>(42){(core::int) → self::GenericClass<core::int>};
-  self::GenericClass<core::int> g = self::GenericClass|<core::int>(87);
-  self::GenericClass<core::int> g2 = #C3<core::int>(87){(core::int) → self::GenericClass<core::int>};
-  self::GenericClass<core::num> h = self::GenericClass|<core::num>(123);
-  self::GenericClass<core::num> h2 = #C3<core::num>(123){(core::num) → self::GenericClass<core::num>};
+  self::Class /* = core::int */ a = self::Class|(3);
+  self::Class /* = core::int */ b = self::Class|(4);
+  self::Class /* = core::int */ b2 = #C1(4){(core::int) → self::Class /* = core::int */};
+  self::Class /* = core::int */ c = self::Class|named(5);
+  self::Class /* = core::int */ c2 = #C2(5){(core::int) → self::Class /* = core::int */};
+  self::GenericClass<core::String> /* = core::String */ d = self::GenericClass|<core::String>("foo");
+  self::GenericClass<core::String> /* = core::String */ d2 = #C4("foo"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ d3 = #C3<core::String>("foo"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e = self::GenericClass|<core::String>("bar");
+  self::GenericClass<core::String> /* = core::String */ e2 = #C4("bar"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e3 = #C3<core::String>("bar"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::int> /* = core::int */ f = self::GenericClass|<core::int>(42);
+  self::GenericClass<core::int> /* = core::int */ f2 = #C5(42){(core::int) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::int> /* = core::int */ f3 = #C3<core::int>(42){(core::int) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::int> /* = core::int */ g = self::GenericClass|<core::int>(87);
+  self::GenericClass<core::int> /* = core::int */ g2 = #C3<core::int>(87){(core::int) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::num> /* = core::num */ h = self::GenericClass|<core::num>(123);
+  self::GenericClass<core::num> /* = core::num */ h2 = #C3<core::num>(123){(core::num) → self::GenericClass<core::num> /* = core::num */};
   self::expect(3, a as{Unchecked} core::int);
   self::expect(3, a);
   self::expect(4, b as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.outline.expect
index 321119ea7fc..50e6bc74ff1 100644
--- a/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.outline.expect
@@ -12,17 +12,17 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::GenericClass|;
   tearoff • = self::GenericClass|_#new#tearOff;
 }
-static inline-class-member method Class|(core::int it) → self::Class
+static inline-class-member method Class|(core::int it) → self::Class /* = core::int */
   ;
-static inline-class-member method Class|_#new#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#new#tearOff(core::int it) → self::Class /* = core::int */
   return self::Class|(it);
-static inline-class-member method Class|named(core::int it) → self::Class
+static inline-class-member method Class|named(core::int it) → self::Class /* = core::int */
   ;
-static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class /* = core::int */
   return self::Class|named(it);
-static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%>
+static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */
   ;
-static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
+static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%> /* = self::GenericClass|_#new#tearOff::T% */
   return self::GenericClass|<self::GenericClass|_#new#tearOff::T%>(it);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.transformed.expect
index 64868a06ad4..8836c1c123d 100644
--- a/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.transformed.expect
@@ -12,43 +12,43 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::GenericClass|;
   tearoff • = self::GenericClass|_#new#tearOff;
 }
-static inline-class-member method Class|(core::int it) → self::Class {
-  lowered final self::Class #this = it;
+static inline-class-member method Class|(core::int it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#new#tearOff(core::int it) → self::Class /* = core::int */
   return self::Class|(it);
-static inline-class-member method Class|named(core::int it) → self::Class {
-  lowered final self::Class #this = it.{core::num::+}(1){(core::num) → core::int};
+static inline-class-member method Class|named(core::int it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class /* = core::int */
   return self::Class|named(it);
-static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> {
-  lowered final self::GenericClass<self::GenericClass|::T%> #this = it;
+static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ {
+  lowered final self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
+static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%> /* = self::GenericClass|_#new#tearOff::T% */
   return self::GenericClass|<self::GenericClass|_#new#tearOff::T%>(it);
 static method main() → dynamic {
-  self::Class a = self::Class|(3);
-  self::Class b = self::Class|(4);
-  self::Class b2 = #C1(4){(core::int) → self::Class};
-  self::Class c = self::Class|named(5);
-  self::Class c2 = #C2(5){(core::int) → self::Class};
-  self::GenericClass<core::String> d = self::GenericClass|<core::String>("foo");
-  self::GenericClass<core::String> d2 = #C4("foo"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> d3 = #C3<core::String>("foo"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e = self::GenericClass|<core::String>("bar");
-  self::GenericClass<core::String> e2 = #C4("bar"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e3 = #C3<core::String>("bar"){(core::String) → self::GenericClass<core::String>};
-  self::GenericClass<core::int> f = self::GenericClass|<core::int>(42);
-  self::GenericClass<core::int> f2 = #C5(42){(core::int) → self::GenericClass<core::int>};
-  self::GenericClass<core::int> f3 = #C3<core::int>(42){(core::int) → self::GenericClass<core::int>};
-  self::GenericClass<core::int> g = self::GenericClass|<core::int>(87);
-  self::GenericClass<core::int> g2 = #C3<core::int>(87){(core::int) → self::GenericClass<core::int>};
-  self::GenericClass<core::num> h = self::GenericClass|<core::num>(123);
-  self::GenericClass<core::num> h2 = #C3<core::num>(123){(core::num) → self::GenericClass<core::num>};
+  self::Class /* = core::int */ a = self::Class|(3);
+  self::Class /* = core::int */ b = self::Class|(4);
+  self::Class /* = core::int */ b2 = #C1(4){(core::int) → self::Class /* = core::int */};
+  self::Class /* = core::int */ c = self::Class|named(5);
+  self::Class /* = core::int */ c2 = #C2(5){(core::int) → self::Class /* = core::int */};
+  self::GenericClass<core::String> /* = core::String */ d = self::GenericClass|<core::String>("foo");
+  self::GenericClass<core::String> /* = core::String */ d2 = #C4("foo"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ d3 = #C3<core::String>("foo"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e = self::GenericClass|<core::String>("bar");
+  self::GenericClass<core::String> /* = core::String */ e2 = #C4("bar"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e3 = #C3<core::String>("bar"){(core::String) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::int> /* = core::int */ f = self::GenericClass|<core::int>(42);
+  self::GenericClass<core::int> /* = core::int */ f2 = #C5(42){(core::int) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::int> /* = core::int */ f3 = #C3<core::int>(42){(core::int) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::int> /* = core::int */ g = self::GenericClass|<core::int>(87);
+  self::GenericClass<core::int> /* = core::int */ g2 = #C3<core::int>(87){(core::int) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::num> /* = core::num */ h = self::GenericClass|<core::num>(123);
+  self::GenericClass<core::num> /* = core::num */ h2 = #C3<core::num>(123){(core::num) → self::GenericClass<core::num> /* = core::num */};
   self::expect(3, a as{Unchecked} core::int);
   self::expect(3, a);
   self::expect(4, b as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.strong.expect b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.strong.expect
index 41949be39ee..fafc24c1bb6 100644
--- a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.strong.expect
@@ -34,99 +34,99 @@ extension type Class2<T extends core::Object? = dynamic>(T% it) {
   constructor named6 = self::Class2|named6;
   tearoff named6 = self::Class2|_#named6#tearOff;
 }
-static inline-class-member method Class1|(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named1(it, additional);
-static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named2(it, additional);
-static inline-class-member method Class1|named3(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named3(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|named3(it);
-static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named4(additional, it);
-static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named5(additional, it);
-static inline-class-member method Class1|named6(core::String text) → self::Class1 {
-  lowered final self::Class1 #this = text.{core::String::length}{core::int};
+static inline-class-member method Class1|named6(core::String text) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = text.{core::String::length}{core::int};
   return #this;
 }
-static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1
+static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1 /* = core::int */
   return self::Class1|named6(text);
-static inline-class-member method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> {
-  lowered final self::Class2<self::Class2|::T%> #this = it;
+static inline-class-member method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ {
+  lowered final self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%>
+static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%> /* = self::Class2|_#new#tearOff::T% */
   return self::Class2|<self::Class2|_#new#tearOff::T%>(it);
-static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
-  lowered final self::Class2<self::Class2|named1::T%> #this = it;
+static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ {
+  lowered final self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
+static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%> /* = self::Class2|_#named1#tearOff::T% */
   return self::Class2|named1<self::Class2|_#named1#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
-  lowered final self::Class2<self::Class2|named2::T%> #this = it;
+static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ {
+  lowered final self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
+static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%> /* = self::Class2|_#named2#tearOff::T% */
   return self::Class2|named2<self::Class2|_#named2#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
-  lowered final self::Class2<self::Class2|named3::T%> #this = it;
+static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ {
+  lowered final self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
+static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%> /* = self::Class2|_#named3#tearOff::T% */
   return self::Class2|named3<self::Class2|_#named3#tearOff::T%>(it);
-static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
-  lowered final self::Class2<self::Class2|named4::T%> #this = it;
+static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ {
+  lowered final self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
+static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%> /* = self::Class2|_#named4#tearOff::T% */
   return self::Class2|named4<self::Class2|_#named4#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
-  lowered final self::Class2<self::Class2|named5::T%> #this = it;
+static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ {
+  lowered final self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
+static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%> /* = self::Class2|_#named5#tearOff::T% */
   return self::Class2|named5<self::Class2|_#named5#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
-  lowered final self::Class2<self::Class2|named6::T%> #this = list.{core::Iterable::first}{self::Class2|named6::T%};
+static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ {
+  lowered final self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ #this = list.{core::Iterable::first}{self::Class2|named6::T%};
   return #this;
 }
-static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
+static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%> /* = self::Class2|_#named6#tearOff::T% */
   return self::Class2|named6<self::Class2|_#named6#tearOff::T%>(list);
diff --git a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.strong.transformed.expect
index 41949be39ee..fafc24c1bb6 100644
--- a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.strong.transformed.expect
@@ -34,99 +34,99 @@ extension type Class2<T extends core::Object? = dynamic>(T% it) {
   constructor named6 = self::Class2|named6;
   tearoff named6 = self::Class2|_#named6#tearOff;
 }
-static inline-class-member method Class1|(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named1(it, additional);
-static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named2(it, additional);
-static inline-class-member method Class1|named3(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named3(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|named3(it);
-static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named4(additional, it);
-static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named5(additional, it);
-static inline-class-member method Class1|named6(core::String text) → self::Class1 {
-  lowered final self::Class1 #this = text.{core::String::length}{core::int};
+static inline-class-member method Class1|named6(core::String text) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = text.{core::String::length}{core::int};
   return #this;
 }
-static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1
+static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1 /* = core::int */
   return self::Class1|named6(text);
-static inline-class-member method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> {
-  lowered final self::Class2<self::Class2|::T%> #this = it;
+static inline-class-member method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ {
+  lowered final self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%>
+static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%> /* = self::Class2|_#new#tearOff::T% */
   return self::Class2|<self::Class2|_#new#tearOff::T%>(it);
-static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
-  lowered final self::Class2<self::Class2|named1::T%> #this = it;
+static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ {
+  lowered final self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
+static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%> /* = self::Class2|_#named1#tearOff::T% */
   return self::Class2|named1<self::Class2|_#named1#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
-  lowered final self::Class2<self::Class2|named2::T%> #this = it;
+static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ {
+  lowered final self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
+static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%> /* = self::Class2|_#named2#tearOff::T% */
   return self::Class2|named2<self::Class2|_#named2#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
-  lowered final self::Class2<self::Class2|named3::T%> #this = it;
+static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ {
+  lowered final self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
+static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%> /* = self::Class2|_#named3#tearOff::T% */
   return self::Class2|named3<self::Class2|_#named3#tearOff::T%>(it);
-static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
-  lowered final self::Class2<self::Class2|named4::T%> #this = it;
+static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ {
+  lowered final self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
+static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%> /* = self::Class2|_#named4#tearOff::T% */
   return self::Class2|named4<self::Class2|_#named4#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
-  lowered final self::Class2<self::Class2|named5::T%> #this = it;
+static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ {
+  lowered final self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
+static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%> /* = self::Class2|_#named5#tearOff::T% */
   return self::Class2|named5<self::Class2|_#named5#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
-  lowered final self::Class2<self::Class2|named6::T%> #this = list.{core::Iterable::first}{self::Class2|named6::T%};
+static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ {
+  lowered final self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ #this = list.{core::Iterable::first}{self::Class2|named6::T%};
   return #this;
 }
-static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
+static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%> /* = self::Class2|_#named6#tearOff::T% */
   return self::Class2|named6<self::Class2|_#named6#tearOff::T%>(list);
diff --git a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.expect b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.expect
index 41949be39ee..fafc24c1bb6 100644
--- a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.expect
@@ -34,99 +34,99 @@ extension type Class2<T extends core::Object? = dynamic>(T% it) {
   constructor named6 = self::Class2|named6;
   tearoff named6 = self::Class2|_#named6#tearOff;
 }
-static inline-class-member method Class1|(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named1(it, additional);
-static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named2(it, additional);
-static inline-class-member method Class1|named3(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named3(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|named3(it);
-static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named4(additional, it);
-static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named5(additional, it);
-static inline-class-member method Class1|named6(core::String text) → self::Class1 {
-  lowered final self::Class1 #this = text.{core::String::length}{core::int};
+static inline-class-member method Class1|named6(core::String text) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = text.{core::String::length}{core::int};
   return #this;
 }
-static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1
+static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1 /* = core::int */
   return self::Class1|named6(text);
-static inline-class-member method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> {
-  lowered final self::Class2<self::Class2|::T%> #this = it;
+static inline-class-member method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ {
+  lowered final self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%>
+static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%> /* = self::Class2|_#new#tearOff::T% */
   return self::Class2|<self::Class2|_#new#tearOff::T%>(it);
-static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
-  lowered final self::Class2<self::Class2|named1::T%> #this = it;
+static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ {
+  lowered final self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
+static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%> /* = self::Class2|_#named1#tearOff::T% */
   return self::Class2|named1<self::Class2|_#named1#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
-  lowered final self::Class2<self::Class2|named2::T%> #this = it;
+static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ {
+  lowered final self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
+static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%> /* = self::Class2|_#named2#tearOff::T% */
   return self::Class2|named2<self::Class2|_#named2#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
-  lowered final self::Class2<self::Class2|named3::T%> #this = it;
+static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ {
+  lowered final self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
+static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%> /* = self::Class2|_#named3#tearOff::T% */
   return self::Class2|named3<self::Class2|_#named3#tearOff::T%>(it);
-static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
-  lowered final self::Class2<self::Class2|named4::T%> #this = it;
+static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ {
+  lowered final self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
+static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%> /* = self::Class2|_#named4#tearOff::T% */
   return self::Class2|named4<self::Class2|_#named4#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
-  lowered final self::Class2<self::Class2|named5::T%> #this = it;
+static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ {
+  lowered final self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
+static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%> /* = self::Class2|_#named5#tearOff::T% */
   return self::Class2|named5<self::Class2|_#named5#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
-  lowered final self::Class2<self::Class2|named6::T%> #this = list.{core::Iterable::first}{self::Class2|named6::T%};
+static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ {
+  lowered final self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ #this = list.{core::Iterable::first}{self::Class2|named6::T%};
   return #this;
 }
-static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
+static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%> /* = self::Class2|_#named6#tearOff::T% */
   return self::Class2|named6<self::Class2|_#named6#tearOff::T%>(list);
diff --git a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.modular.expect
index 41949be39ee..fafc24c1bb6 100644
--- a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.modular.expect
@@ -34,99 +34,99 @@ extension type Class2<T extends core::Object? = dynamic>(T% it) {
   constructor named6 = self::Class2|named6;
   tearoff named6 = self::Class2|_#named6#tearOff;
 }
-static inline-class-member method Class1|(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named1(it, additional);
-static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named2(it, additional);
-static inline-class-member method Class1|named3(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named3(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|named3(it);
-static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named4(additional, it);
-static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named5(additional, it);
-static inline-class-member method Class1|named6(core::String text) → self::Class1 {
-  lowered final self::Class1 #this = text.{core::String::length}{core::int};
+static inline-class-member method Class1|named6(core::String text) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = text.{core::String::length}{core::int};
   return #this;
 }
-static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1
+static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1 /* = core::int */
   return self::Class1|named6(text);
-static inline-class-member method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> {
-  lowered final self::Class2<self::Class2|::T%> #this = it;
+static inline-class-member method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ {
+  lowered final self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%>
+static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%> /* = self::Class2|_#new#tearOff::T% */
   return self::Class2|<self::Class2|_#new#tearOff::T%>(it);
-static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
-  lowered final self::Class2<self::Class2|named1::T%> #this = it;
+static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ {
+  lowered final self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
+static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%> /* = self::Class2|_#named1#tearOff::T% */
   return self::Class2|named1<self::Class2|_#named1#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
-  lowered final self::Class2<self::Class2|named2::T%> #this = it;
+static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ {
+  lowered final self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
+static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%> /* = self::Class2|_#named2#tearOff::T% */
   return self::Class2|named2<self::Class2|_#named2#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
-  lowered final self::Class2<self::Class2|named3::T%> #this = it;
+static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ {
+  lowered final self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
+static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%> /* = self::Class2|_#named3#tearOff::T% */
   return self::Class2|named3<self::Class2|_#named3#tearOff::T%>(it);
-static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
-  lowered final self::Class2<self::Class2|named4::T%> #this = it;
+static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ {
+  lowered final self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
+static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%> /* = self::Class2|_#named4#tearOff::T% */
   return self::Class2|named4<self::Class2|_#named4#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
-  lowered final self::Class2<self::Class2|named5::T%> #this = it;
+static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ {
+  lowered final self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
+static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%> /* = self::Class2|_#named5#tearOff::T% */
   return self::Class2|named5<self::Class2|_#named5#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
-  lowered final self::Class2<self::Class2|named6::T%> #this = list.{core::Iterable::first}{self::Class2|named6::T%};
+static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ {
+  lowered final self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ #this = list.{core::Iterable::first}{self::Class2|named6::T%};
   return #this;
 }
-static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
+static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%> /* = self::Class2|_#named6#tearOff::T% */
   return self::Class2|named6<self::Class2|_#named6#tearOff::T%>(list);
diff --git a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.outline.expect
index 5dd4755b68a..120ebb987e4 100644
--- a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.outline.expect
@@ -34,59 +34,59 @@ extension type Class2<T extends core::Object? = dynamic>(T% it) {
   constructor named6 = self::Class2|named6;
   tearoff named6 = self::Class2|_#named6#tearOff;
 }
-static inline-class-member method Class1|(core::int it) → self::Class1
+static inline-class-member method Class1|(core::int it) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named1(it, additional);
-static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named2(it, additional);
-static inline-class-member method Class1|named3(core::int it) → self::Class1
+static inline-class-member method Class1|named3(core::int it) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|named3(it);
-static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named4(additional, it);
-static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named5(additional, it);
-static inline-class-member method Class1|named6(core::String text) → self::Class1
+static inline-class-member method Class1|named6(core::String text) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1
+static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1 /* = core::int */
   return self::Class1|named6(text);
-static inline-class-member method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%>
+static inline-class-member method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> /* = self::Class2|::T% */
   ;
-static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%>
+static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%> /* = self::Class2|_#new#tearOff::T% */
   return self::Class2|<self::Class2|_#new#tearOff::T%>(it);
-static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%>
+static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */
   ;
-static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
+static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%> /* = self::Class2|_#named1#tearOff::T% */
   return self::Class2|named1<self::Class2|_#named1#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%>
+static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */
   ;
-static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
+static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%> /* = self::Class2|_#named2#tearOff::T% */
   return self::Class2|named2<self::Class2|_#named2#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%>
+static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */
   ;
-static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
+static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%> /* = self::Class2|_#named3#tearOff::T% */
   return self::Class2|named3<self::Class2|_#named3#tearOff::T%>(it);
-static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%>
+static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */
   ;
-static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
+static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%> /* = self::Class2|_#named4#tearOff::T% */
   return self::Class2|named4<self::Class2|_#named4#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%>
+static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */
   ;
-static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
+static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%> /* = self::Class2|_#named5#tearOff::T% */
   return self::Class2|named5<self::Class2|_#named5#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%>
+static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */
   ;
-static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
+static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%> /* = self::Class2|_#named6#tearOff::T% */
   return self::Class2|named6<self::Class2|_#named6#tearOff::T%>(list);
diff --git a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.transformed.expect
index 41949be39ee..fafc24c1bb6 100644
--- a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.transformed.expect
@@ -34,99 +34,99 @@ extension type Class2<T extends core::Object? = dynamic>(T% it) {
   constructor named6 = self::Class2|named6;
   tearoff named6 = self::Class2|_#named6#tearOff;
 }
-static inline-class-member method Class1|(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named1(it, additional);
-static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named2(it, additional);
-static inline-class-member method Class1|named3(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named3(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|named3(it);
-static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named4(additional, it);
-static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named5(additional, it);
-static inline-class-member method Class1|named6(core::String text) → self::Class1 {
-  lowered final self::Class1 #this = text.{core::String::length}{core::int};
+static inline-class-member method Class1|named6(core::String text) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = text.{core::String::length}{core::int};
   return #this;
 }
-static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1
+static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1 /* = core::int */
   return self::Class1|named6(text);
-static inline-class-member method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> {
-  lowered final self::Class2<self::Class2|::T%> #this = it;
+static inline-class-member method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ {
+  lowered final self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%>
+static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%> /* = self::Class2|_#new#tearOff::T% */
   return self::Class2|<self::Class2|_#new#tearOff::T%>(it);
-static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
-  lowered final self::Class2<self::Class2|named1::T%> #this = it;
+static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ {
+  lowered final self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
+static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%> /* = self::Class2|_#named1#tearOff::T% */
   return self::Class2|named1<self::Class2|_#named1#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
-  lowered final self::Class2<self::Class2|named2::T%> #this = it;
+static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ {
+  lowered final self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
+static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%> /* = self::Class2|_#named2#tearOff::T% */
   return self::Class2|named2<self::Class2|_#named2#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
-  lowered final self::Class2<self::Class2|named3::T%> #this = it;
+static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ {
+  lowered final self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
+static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%> /* = self::Class2|_#named3#tearOff::T% */
   return self::Class2|named3<self::Class2|_#named3#tearOff::T%>(it);
-static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
-  lowered final self::Class2<self::Class2|named4::T%> #this = it;
+static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ {
+  lowered final self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
+static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%> /* = self::Class2|_#named4#tearOff::T% */
   return self::Class2|named4<self::Class2|_#named4#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
-  lowered final self::Class2<self::Class2|named5::T%> #this = it;
+static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ {
+  lowered final self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
+static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%> /* = self::Class2|_#named5#tearOff::T% */
   return self::Class2|named5<self::Class2|_#named5#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
-  lowered final self::Class2<self::Class2|named6::T%> #this = list.{core::Iterable::first}{self::Class2|named6::T%};
+static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ {
+  lowered final self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ #this = list.{core::Iterable::first}{self::Class2|named6::T%};
   return #this;
 }
-static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
+static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%> /* = self::Class2|_#named6#tearOff::T% */
   return self::Class2|named6<self::Class2|_#named6#tearOff::T%>(list);
diff --git a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.strong.expect b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.strong.expect
index 29573f5f9b7..118a61b2739 100644
--- a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.strong.expect
@@ -14,23 +14,23 @@ extension type I2(core::int it) {
   constructor • = self::I2|;
   tearoff • = self::I2|_#new#tearOff;
 }
-static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I {
-  lowered final self::I #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
+static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
+static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I /* = core::int */
   return self::I|(x, y);
-static inline-class-member method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
-static inline-class-member method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
+static inline-class-member method I|m(lowered final self::I /* = core::int */ #this, core::String s, [core::int i = #C2]) → void {}
+static inline-class-member method I|get#m(lowered final self::I /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C2]) → void => self::I|m(#this, s, i);
-static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
-  lowered final self::I2 #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
+static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 /* = core::int */ {
+  lowered final self::I2 /* = core::int */ #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
+static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2 /* = core::int */
   return self::I2|(x, y: y);
-static inline-class-member method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
-static inline-class-member method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
+static inline-class-member method I2|m(lowered final self::I2 /* = core::int */ #this, core::String s, {core::int i = #C2}) → void {}
+static inline-class-member method I2|get#m(lowered final self::I2 /* = core::int */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C2}) → void => self::I2|m(#this, s, i: i);
 static method main() → dynamic {
   self::expect(42, self::I|(0));
diff --git a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.strong.transformed.expect
index 29573f5f9b7..118a61b2739 100644
--- a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.strong.transformed.expect
@@ -14,23 +14,23 @@ extension type I2(core::int it) {
   constructor • = self::I2|;
   tearoff • = self::I2|_#new#tearOff;
 }
-static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I {
-  lowered final self::I #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
+static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
+static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I /* = core::int */
   return self::I|(x, y);
-static inline-class-member method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
-static inline-class-member method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
+static inline-class-member method I|m(lowered final self::I /* = core::int */ #this, core::String s, [core::int i = #C2]) → void {}
+static inline-class-member method I|get#m(lowered final self::I /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C2]) → void => self::I|m(#this, s, i);
-static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
-  lowered final self::I2 #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
+static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 /* = core::int */ {
+  lowered final self::I2 /* = core::int */ #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
+static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2 /* = core::int */
   return self::I2|(x, y: y);
-static inline-class-member method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
-static inline-class-member method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
+static inline-class-member method I2|m(lowered final self::I2 /* = core::int */ #this, core::String s, {core::int i = #C2}) → void {}
+static inline-class-member method I2|get#m(lowered final self::I2 /* = core::int */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C2}) → void => self::I2|m(#this, s, i: i);
 static method main() → dynamic {
   self::expect(42, self::I|(0));
diff --git a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.expect b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.expect
index 29573f5f9b7..118a61b2739 100644
--- a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.expect
@@ -14,23 +14,23 @@ extension type I2(core::int it) {
   constructor • = self::I2|;
   tearoff • = self::I2|_#new#tearOff;
 }
-static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I {
-  lowered final self::I #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
+static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
+static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I /* = core::int */
   return self::I|(x, y);
-static inline-class-member method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
-static inline-class-member method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
+static inline-class-member method I|m(lowered final self::I /* = core::int */ #this, core::String s, [core::int i = #C2]) → void {}
+static inline-class-member method I|get#m(lowered final self::I /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C2]) → void => self::I|m(#this, s, i);
-static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
-  lowered final self::I2 #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
+static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 /* = core::int */ {
+  lowered final self::I2 /* = core::int */ #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
+static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2 /* = core::int */
   return self::I2|(x, y: y);
-static inline-class-member method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
-static inline-class-member method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
+static inline-class-member method I2|m(lowered final self::I2 /* = core::int */ #this, core::String s, {core::int i = #C2}) → void {}
+static inline-class-member method I2|get#m(lowered final self::I2 /* = core::int */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C2}) → void => self::I2|m(#this, s, i: i);
 static method main() → dynamic {
   self::expect(42, self::I|(0));
diff --git a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.modular.expect
index 29573f5f9b7..118a61b2739 100644
--- a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.modular.expect
@@ -14,23 +14,23 @@ extension type I2(core::int it) {
   constructor • = self::I2|;
   tearoff • = self::I2|_#new#tearOff;
 }
-static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I {
-  lowered final self::I #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
+static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
+static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I /* = core::int */
   return self::I|(x, y);
-static inline-class-member method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
-static inline-class-member method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
+static inline-class-member method I|m(lowered final self::I /* = core::int */ #this, core::String s, [core::int i = #C2]) → void {}
+static inline-class-member method I|get#m(lowered final self::I /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C2]) → void => self::I|m(#this, s, i);
-static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
-  lowered final self::I2 #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
+static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 /* = core::int */ {
+  lowered final self::I2 /* = core::int */ #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
+static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2 /* = core::int */
   return self::I2|(x, y: y);
-static inline-class-member method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
-static inline-class-member method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
+static inline-class-member method I2|m(lowered final self::I2 /* = core::int */ #this, core::String s, {core::int i = #C2}) → void {}
+static inline-class-member method I2|get#m(lowered final self::I2 /* = core::int */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C2}) → void => self::I2|m(#this, s, i: i);
 static method main() → dynamic {
   self::expect(42, self::I|(0));
diff --git a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.outline.expect
index a54b0cd6ba4..846402b8d30 100644
--- a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.outline.expect
@@ -14,21 +14,21 @@ extension type I2(core::int it) {
   constructor • = self::I2|;
   tearoff • = self::I2|_#new#tearOff;
 }
-static inline-class-member method I|(core::int x, [core::int? y = null]) → self::I
+static inline-class-member method I|(core::int x, [core::int? y = null]) → self::I /* = core::int */
   ;
-static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
+static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I /* = core::int */
   return self::I|(x, y);
-static inline-class-member method I|m(lowered final self::I #this, core::String s, [has-declared-initializer core::int i]) → void
+static inline-class-member method I|m(lowered final self::I /* = core::int */ #this, core::String s, [has-declared-initializer core::int i]) → void
   ;
-static inline-class-member method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
+static inline-class-member method I|get#m(lowered final self::I /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i]) → void => self::I|m(#this, s, i);
-static inline-class-member method I2|(core::int x, {core::int? y = null}) → self::I2
+static inline-class-member method I2|(core::int x, {core::int? y = null}) → self::I2 /* = core::int */
   ;
-static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
+static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2 /* = core::int */
   return self::I2|(x, y: y);
-static inline-class-member method I2|m(lowered final self::I2 #this, core::String s, {has-declared-initializer core::int i}) → void
+static inline-class-member method I2|m(lowered final self::I2 /* = core::int */ #this, core::String s, {has-declared-initializer core::int i}) → void
   ;
-static inline-class-member method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
+static inline-class-member method I2|get#m(lowered final self::I2 /* = core::int */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i}) → void => self::I2|m(#this, s, i: i);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.transformed.expect
index 29573f5f9b7..118a61b2739 100644
--- a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.transformed.expect
@@ -14,23 +14,23 @@ extension type I2(core::int it) {
   constructor • = self::I2|;
   tearoff • = self::I2|_#new#tearOff;
 }
-static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I {
-  lowered final self::I #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
+static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
+static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I /* = core::int */
   return self::I|(x, y);
-static inline-class-member method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
-static inline-class-member method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
+static inline-class-member method I|m(lowered final self::I /* = core::int */ #this, core::String s, [core::int i = #C2]) → void {}
+static inline-class-member method I|get#m(lowered final self::I /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C2]) → void => self::I|m(#this, s, i);
-static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
-  lowered final self::I2 #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
+static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 /* = core::int */ {
+  lowered final self::I2 /* = core::int */ #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
+static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2 /* = core::int */
   return self::I2|(x, y: y);
-static inline-class-member method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
-static inline-class-member method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
+static inline-class-member method I2|m(lowered final self::I2 /* = core::int */ #this, core::String s, {core::int i = #C2}) → void {}
+static inline-class-member method I2|get#m(lowered final self::I2 /* = core::int */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C2}) → void => self::I2|m(#this, s, i: i);
 static method main() → dynamic {
   self::expect(42, self::I|(0));
diff --git a/pkg/front_end/testcases/inline_class/constructors.dart.strong.expect b/pkg/front_end/testcases/inline_class/constructors.dart.strong.expect
index 24241399c3f..d9552a61b6f 100644
--- a/pkg/front_end/testcases/inline_class/constructors.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/constructors.dart.strong.expect
@@ -10,15 +10,15 @@ extension type Class2(core::int field) {
   constructor • = self::Class2|;
   tearoff • = self::Class2|_#new#tearOff;
 }
-static inline-class-member method Class1|(core::int field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(core::int field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|(core::int field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(core::int field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2 /* = core::int */
   return self::Class2|(field);
diff --git a/pkg/front_end/testcases/inline_class/constructors.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/constructors.dart.strong.transformed.expect
index 24241399c3f..d9552a61b6f 100644
--- a/pkg/front_end/testcases/inline_class/constructors.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/constructors.dart.strong.transformed.expect
@@ -10,15 +10,15 @@ extension type Class2(core::int field) {
   constructor • = self::Class2|;
   tearoff • = self::Class2|_#new#tearOff;
 }
-static inline-class-member method Class1|(core::int field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(core::int field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|(core::int field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(core::int field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2 /* = core::int */
   return self::Class2|(field);
diff --git a/pkg/front_end/testcases/inline_class/constructors.dart.weak.expect b/pkg/front_end/testcases/inline_class/constructors.dart.weak.expect
index 24241399c3f..d9552a61b6f 100644
--- a/pkg/front_end/testcases/inline_class/constructors.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/constructors.dart.weak.expect
@@ -10,15 +10,15 @@ extension type Class2(core::int field) {
   constructor • = self::Class2|;
   tearoff • = self::Class2|_#new#tearOff;
 }
-static inline-class-member method Class1|(core::int field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(core::int field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|(core::int field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(core::int field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2 /* = core::int */
   return self::Class2|(field);
diff --git a/pkg/front_end/testcases/inline_class/constructors.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/constructors.dart.weak.modular.expect
index 24241399c3f..d9552a61b6f 100644
--- a/pkg/front_end/testcases/inline_class/constructors.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/constructors.dart.weak.modular.expect
@@ -10,15 +10,15 @@ extension type Class2(core::int field) {
   constructor • = self::Class2|;
   tearoff • = self::Class2|_#new#tearOff;
 }
-static inline-class-member method Class1|(core::int field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(core::int field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|(core::int field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(core::int field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2 /* = core::int */
   return self::Class2|(field);
diff --git a/pkg/front_end/testcases/inline_class/constructors.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/constructors.dart.weak.outline.expect
index 603763ce9af..390bee828e1 100644
--- a/pkg/front_end/testcases/inline_class/constructors.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/constructors.dart.weak.outline.expect
@@ -10,11 +10,11 @@ extension type Class2(core::int field) {
   constructor • = self::Class2|;
   tearoff • = self::Class2|_#new#tearOff;
 }
-static inline-class-member method Class1|(core::int field) → self::Class1
+static inline-class-member method Class1|(core::int field) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|(core::int field) → self::Class2
+static inline-class-member method Class2|(core::int field) → self::Class2 /* = core::int */
   ;
-static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2 /* = core::int */
   return self::Class2|(field);
diff --git a/pkg/front_end/testcases/inline_class/constructors.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/constructors.dart.weak.transformed.expect
index 24241399c3f..d9552a61b6f 100644
--- a/pkg/front_end/testcases/inline_class/constructors.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/constructors.dart.weak.transformed.expect
@@ -10,15 +10,15 @@ extension type Class2(core::int field) {
   constructor • = self::Class2|;
   tearoff • = self::Class2|_#new#tearOff;
 }
-static inline-class-member method Class1|(core::int field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(core::int field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|(core::int field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(core::int field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2 /* = core::int */
   return self::Class2|(field);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.strong.expect
index 359b7646332..f9393d5b704 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.strong.expect
@@ -24,26 +24,26 @@ extension type E(self::B it) implements self::B {
   constructor • = self::E|;
   tearoff • = self::E|_#new#tearOff;
 }
-extension type F(self::B it) implements self::E {
+extension type F(self::B it) implements self::E /* = self::B */ {
   constructor • = self::F|;
   tearoff • = self::F|_#new#tearOff;
 }
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = self::B */ {
+  lowered final self::E /* = self::B */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = self::B */
   return self::E|(it);
-static inline-class-member method F|(dynamic it) → self::F {
-  lowered final self::F #this = it;
+static inline-class-member method F|(dynamic it) → self::F /* = self::B */ {
+  lowered final self::F /* = self::B */ #this = it;
   return #this;
 }
-static inline-class-member method F|_#new#tearOff(dynamic it) → self::F
+static inline-class-member method F|_#new#tearOff(dynamic it) → self::F /* = self::B */
   return self::F|(it);
 static method main() → dynamic {
   self::B b = new self::B::•();
-  self::E e = self::E|(b);
-  self::F f = self::F|(b);
+  self::E /* = self::B */ e = self::E|(b);
+  self::F /* = self::B */ f = self::F|(b);
   self::expect(42, b.{self::A::field}{core::int});
   self::expect(42, e.{self::A::field}{core::int});
   self::expect(42, f.{self::A::field}{core::int});
diff --git a/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.strong.transformed.expect
index 359b7646332..f9393d5b704 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.strong.transformed.expect
@@ -24,26 +24,26 @@ extension type E(self::B it) implements self::B {
   constructor • = self::E|;
   tearoff • = self::E|_#new#tearOff;
 }
-extension type F(self::B it) implements self::E {
+extension type F(self::B it) implements self::E /* = self::B */ {
   constructor • = self::F|;
   tearoff • = self::F|_#new#tearOff;
 }
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = self::B */ {
+  lowered final self::E /* = self::B */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = self::B */
   return self::E|(it);
-static inline-class-member method F|(dynamic it) → self::F {
-  lowered final self::F #this = it;
+static inline-class-member method F|(dynamic it) → self::F /* = self::B */ {
+  lowered final self::F /* = self::B */ #this = it;
   return #this;
 }
-static inline-class-member method F|_#new#tearOff(dynamic it) → self::F
+static inline-class-member method F|_#new#tearOff(dynamic it) → self::F /* = self::B */
   return self::F|(it);
 static method main() → dynamic {
   self::B b = new self::B::•();
-  self::E e = self::E|(b);
-  self::F f = self::F|(b);
+  self::E /* = self::B */ e = self::E|(b);
+  self::F /* = self::B */ f = self::F|(b);
   self::expect(42, b.{self::A::field}{core::int});
   self::expect(42, e.{self::A::field}{core::int});
   self::expect(42, f.{self::A::field}{core::int});
diff --git a/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.weak.expect
index 359b7646332..f9393d5b704 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.weak.expect
@@ -24,26 +24,26 @@ extension type E(self::B it) implements self::B {
   constructor • = self::E|;
   tearoff • = self::E|_#new#tearOff;
 }
-extension type F(self::B it) implements self::E {
+extension type F(self::B it) implements self::E /* = self::B */ {
   constructor • = self::F|;
   tearoff • = self::F|_#new#tearOff;
 }
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = self::B */ {
+  lowered final self::E /* = self::B */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = self::B */
   return self::E|(it);
-static inline-class-member method F|(dynamic it) → self::F {
-  lowered final self::F #this = it;
+static inline-class-member method F|(dynamic it) → self::F /* = self::B */ {
+  lowered final self::F /* = self::B */ #this = it;
   return #this;
 }
-static inline-class-member method F|_#new#tearOff(dynamic it) → self::F
+static inline-class-member method F|_#new#tearOff(dynamic it) → self::F /* = self::B */
   return self::F|(it);
 static method main() → dynamic {
   self::B b = new self::B::•();
-  self::E e = self::E|(b);
-  self::F f = self::F|(b);
+  self::E /* = self::B */ e = self::E|(b);
+  self::F /* = self::B */ f = self::F|(b);
   self::expect(42, b.{self::A::field}{core::int});
   self::expect(42, e.{self::A::field}{core::int});
   self::expect(42, f.{self::A::field}{core::int});
diff --git a/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.weak.modular.expect
index 359b7646332..f9393d5b704 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.weak.modular.expect
@@ -24,26 +24,26 @@ extension type E(self::B it) implements self::B {
   constructor • = self::E|;
   tearoff • = self::E|_#new#tearOff;
 }
-extension type F(self::B it) implements self::E {
+extension type F(self::B it) implements self::E /* = self::B */ {
   constructor • = self::F|;
   tearoff • = self::F|_#new#tearOff;
 }
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = self::B */ {
+  lowered final self::E /* = self::B */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = self::B */
   return self::E|(it);
-static inline-class-member method F|(dynamic it) → self::F {
-  lowered final self::F #this = it;
+static inline-class-member method F|(dynamic it) → self::F /* = self::B */ {
+  lowered final self::F /* = self::B */ #this = it;
   return #this;
 }
-static inline-class-member method F|_#new#tearOff(dynamic it) → self::F
+static inline-class-member method F|_#new#tearOff(dynamic it) → self::F /* = self::B */
   return self::F|(it);
 static method main() → dynamic {
   self::B b = new self::B::•();
-  self::E e = self::E|(b);
-  self::F f = self::F|(b);
+  self::E /* = self::B */ e = self::E|(b);
+  self::F /* = self::B */ f = self::F|(b);
   self::expect(42, b.{self::A::field}{core::int});
   self::expect(42, e.{self::A::field}{core::int});
   self::expect(42, f.{self::A::field}{core::int});
diff --git a/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.weak.outline.expect
index d5b3e0ff33c..e207433913f 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.weak.outline.expect
@@ -21,17 +21,17 @@ extension type E(self::B it) implements self::B {
   constructor • = self::E|;
   tearoff • = self::E|_#new#tearOff;
 }
-extension type F(self::B it) implements self::E {
+extension type F(self::B it) implements self::E /* = self::B */ {
   constructor • = self::F|;
   tearoff • = self::F|_#new#tearOff;
 }
-static inline-class-member method E|(dynamic it) → self::E
+static inline-class-member method E|(dynamic it) → self::E /* = self::B */
   ;
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = self::B */
   return self::E|(it);
-static inline-class-member method F|(dynamic it) → self::F
+static inline-class-member method F|(dynamic it) → self::F /* = self::B */
   ;
-static inline-class-member method F|_#new#tearOff(dynamic it) → self::F
+static inline-class-member method F|_#new#tearOff(dynamic it) → self::F /* = self::B */
   return self::F|(it);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.weak.transformed.expect
index 359b7646332..f9393d5b704 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/access_non_extension_type_members.dart.weak.transformed.expect
@@ -24,26 +24,26 @@ extension type E(self::B it) implements self::B {
   constructor • = self::E|;
   tearoff • = self::E|_#new#tearOff;
 }
-extension type F(self::B it) implements self::E {
+extension type F(self::B it) implements self::E /* = self::B */ {
   constructor • = self::F|;
   tearoff • = self::F|_#new#tearOff;
 }
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = self::B */ {
+  lowered final self::E /* = self::B */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = self::B */
   return self::E|(it);
-static inline-class-member method F|(dynamic it) → self::F {
-  lowered final self::F #this = it;
+static inline-class-member method F|(dynamic it) → self::F /* = self::B */ {
+  lowered final self::F /* = self::B */ #this = it;
   return #this;
 }
-static inline-class-member method F|_#new#tearOff(dynamic it) → self::F
+static inline-class-member method F|_#new#tearOff(dynamic it) → self::F /* = self::B */
   return self::F|(it);
 static method main() → dynamic {
   self::B b = new self::B::•();
-  self::E e = self::E|(b);
-  self::F f = self::F|(b);
+  self::E /* = self::B */ e = self::E|(b);
+  self::F /* = self::B */ f = self::F|(b);
   self::expect(42, b.{self::A::field}{core::int});
   self::expect(42, e.{self::A::field}{core::int});
   self::expect(42, f.{self::A::field}{core::int});
diff --git a/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.strong.expect
index eca38fb1106..dbafacc300d 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.strong.expect
@@ -11,22 +11,22 @@ extension type A(core::int i) {
   constructor constructor = self::A|constructor;
   tearoff constructor = self::A|_#constructor#tearOff;
 }
-static inline-class-member method A|(@#C2 dynamic i) → self::A {
-  lowered final self::A #this = i;
+static inline-class-member method A|(@#C2 dynamic i) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(dynamic i) → self::A
+static inline-class-member method A|_#new#tearOff(dynamic i) → self::A /* = core::int */
   return self::A|(i);
 @#C2
-static inline-class-member method A|constructor(core::int i) → self::A {
-  lowered final self::A #this = i;
+static inline-class-member method A|constructor(core::int i) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method A|_#constructor#tearOff(core::int i) → self::A
+static inline-class-member method A|_#constructor#tearOff(core::int i) → self::A /* = core::int */
   return self::A|constructor(i);
 @#C2
-static inline-class-member method A|m(lowered final self::A #this) → void {}
-static inline-class-member method A|get#m(lowered final self::A #this) → () → void
+static inline-class-member method A|m(lowered final self::A /* = core::int */ #this) → void {}
+static inline-class-member method A|get#m(lowered final self::A /* = core::int */ #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.strong.transformed.expect
index eca38fb1106..dbafacc300d 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.strong.transformed.expect
@@ -11,22 +11,22 @@ extension type A(core::int i) {
   constructor constructor = self::A|constructor;
   tearoff constructor = self::A|_#constructor#tearOff;
 }
-static inline-class-member method A|(@#C2 dynamic i) → self::A {
-  lowered final self::A #this = i;
+static inline-class-member method A|(@#C2 dynamic i) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(dynamic i) → self::A
+static inline-class-member method A|_#new#tearOff(dynamic i) → self::A /* = core::int */
   return self::A|(i);
 @#C2
-static inline-class-member method A|constructor(core::int i) → self::A {
-  lowered final self::A #this = i;
+static inline-class-member method A|constructor(core::int i) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method A|_#constructor#tearOff(core::int i) → self::A
+static inline-class-member method A|_#constructor#tearOff(core::int i) → self::A /* = core::int */
   return self::A|constructor(i);
 @#C2
-static inline-class-member method A|m(lowered final self::A #this) → void {}
-static inline-class-member method A|get#m(lowered final self::A #this) → () → void
+static inline-class-member method A|m(lowered final self::A /* = core::int */ #this) → void {}
+static inline-class-member method A|get#m(lowered final self::A /* = core::int */ #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.weak.expect
index eca38fb1106..dbafacc300d 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.weak.expect
@@ -11,22 +11,22 @@ extension type A(core::int i) {
   constructor constructor = self::A|constructor;
   tearoff constructor = self::A|_#constructor#tearOff;
 }
-static inline-class-member method A|(@#C2 dynamic i) → self::A {
-  lowered final self::A #this = i;
+static inline-class-member method A|(@#C2 dynamic i) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(dynamic i) → self::A
+static inline-class-member method A|_#new#tearOff(dynamic i) → self::A /* = core::int */
   return self::A|(i);
 @#C2
-static inline-class-member method A|constructor(core::int i) → self::A {
-  lowered final self::A #this = i;
+static inline-class-member method A|constructor(core::int i) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method A|_#constructor#tearOff(core::int i) → self::A
+static inline-class-member method A|_#constructor#tearOff(core::int i) → self::A /* = core::int */
   return self::A|constructor(i);
 @#C2
-static inline-class-member method A|m(lowered final self::A #this) → void {}
-static inline-class-member method A|get#m(lowered final self::A #this) → () → void
+static inline-class-member method A|m(lowered final self::A /* = core::int */ #this) → void {}
+static inline-class-member method A|get#m(lowered final self::A /* = core::int */ #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.weak.modular.expect
index eca38fb1106..dbafacc300d 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.weak.modular.expect
@@ -11,22 +11,22 @@ extension type A(core::int i) {
   constructor constructor = self::A|constructor;
   tearoff constructor = self::A|_#constructor#tearOff;
 }
-static inline-class-member method A|(@#C2 dynamic i) → self::A {
-  lowered final self::A #this = i;
+static inline-class-member method A|(@#C2 dynamic i) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(dynamic i) → self::A
+static inline-class-member method A|_#new#tearOff(dynamic i) → self::A /* = core::int */
   return self::A|(i);
 @#C2
-static inline-class-member method A|constructor(core::int i) → self::A {
-  lowered final self::A #this = i;
+static inline-class-member method A|constructor(core::int i) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method A|_#constructor#tearOff(core::int i) → self::A
+static inline-class-member method A|_#constructor#tearOff(core::int i) → self::A /* = core::int */
   return self::A|constructor(i);
 @#C2
-static inline-class-member method A|m(lowered final self::A #this) → void {}
-static inline-class-member method A|get#m(lowered final self::A #this) → () → void
+static inline-class-member method A|m(lowered final self::A /* = core::int */ #this) → void {}
+static inline-class-member method A|get#m(lowered final self::A /* = core::int */ #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.weak.outline.expect
index f7eb126a375..62227a338f8 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.weak.outline.expect
@@ -11,19 +11,19 @@ extension type A(core::int i) {
   constructor constructor = self::A|constructor;
   tearoff constructor = self::A|_#constructor#tearOff;
 }
-static inline-class-member method A|(dynamic i) → self::A
+static inline-class-member method A|(dynamic i) → self::A /* = core::int */
   ;
-static inline-class-member method A|_#new#tearOff(dynamic i) → self::A
+static inline-class-member method A|_#new#tearOff(dynamic i) → self::A /* = core::int */
   return self::A|(i);
 @core::Deprecated::•("")
-static inline-class-member method A|constructor(core::int i) → self::A
+static inline-class-member method A|constructor(core::int i) → self::A /* = core::int */
   ;
-static inline-class-member method A|_#constructor#tearOff(core::int i) → self::A
+static inline-class-member method A|_#constructor#tearOff(core::int i) → self::A /* = core::int */
   return self::A|constructor(i);
 @core::Deprecated::•("")
-static inline-class-member method A|m(lowered final self::A #this) → void
+static inline-class-member method A|m(lowered final self::A /* = core::int */ #this) → void
   ;
-static inline-class-member method A|get#m(lowered final self::A #this) → () → void
+static inline-class-member method A|get#m(lowered final self::A /* = core::int */ #this) → () → void
   return () → void => self::A|m(#this);
 
 
diff --git a/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.weak.transformed.expect
index eca38fb1106..dbafacc300d 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/annotations.dart.weak.transformed.expect
@@ -11,22 +11,22 @@ extension type A(core::int i) {
   constructor constructor = self::A|constructor;
   tearoff constructor = self::A|_#constructor#tearOff;
 }
-static inline-class-member method A|(@#C2 dynamic i) → self::A {
-  lowered final self::A #this = i;
+static inline-class-member method A|(@#C2 dynamic i) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(dynamic i) → self::A
+static inline-class-member method A|_#new#tearOff(dynamic i) → self::A /* = core::int */
   return self::A|(i);
 @#C2
-static inline-class-member method A|constructor(core::int i) → self::A {
-  lowered final self::A #this = i;
+static inline-class-member method A|constructor(core::int i) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method A|_#constructor#tearOff(core::int i) → self::A
+static inline-class-member method A|_#constructor#tearOff(core::int i) → self::A /* = core::int */
   return self::A|constructor(i);
 @#C2
-static inline-class-member method A|m(lowered final self::A #this) → void {}
-static inline-class-member method A|get#m(lowered final self::A #this) → () → void
+static inline-class-member method A|m(lowered final self::A /* = core::int */ #this) → void {}
+static inline-class-member method A|get#m(lowered final self::A /* = core::int */ #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.strong.expect
index c50e2a6d090..362c8de816d 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.strong.expect
@@ -32,29 +32,29 @@ extension type Class(core::int i) {
   static redirecting-factory redirect2 = self::Class|redirect2;
   static tearoff redirect2 = self::Class|_#redirect2#tearOff;
 }
-static inline-class-member method Class|(dynamic i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|(dynamic i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(dynamic i) → self::Class
+static inline-class-member method Class|_#new#tearOff(dynamic i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|named(core::int i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|named(core::int i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|named(i);
-static inline-class-member method Class|redirect(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|fact(core::int i) → self::Class
+static inline-class-member method Class|fact(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|fact(i);
-static inline-class-member method Class|redirect2(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect2(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart:16:9: Error: Cannot invoke a non-'const' constructor where a const expression is expected.
diff --git a/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.strong.transformed.expect
index c50e2a6d090..362c8de816d 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.strong.transformed.expect
@@ -32,29 +32,29 @@ extension type Class(core::int i) {
   static redirecting-factory redirect2 = self::Class|redirect2;
   static tearoff redirect2 = self::Class|_#redirect2#tearOff;
 }
-static inline-class-member method Class|(dynamic i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|(dynamic i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(dynamic i) → self::Class
+static inline-class-member method Class|_#new#tearOff(dynamic i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|named(core::int i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|named(core::int i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|named(i);
-static inline-class-member method Class|redirect(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|fact(core::int i) → self::Class
+static inline-class-member method Class|fact(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|fact(i);
-static inline-class-member method Class|redirect2(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect2(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart:16:9: Error: Cannot invoke a non-'const' constructor where a const expression is expected.
diff --git a/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.weak.expect
index c50e2a6d090..362c8de816d 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.weak.expect
@@ -32,29 +32,29 @@ extension type Class(core::int i) {
   static redirecting-factory redirect2 = self::Class|redirect2;
   static tearoff redirect2 = self::Class|_#redirect2#tearOff;
 }
-static inline-class-member method Class|(dynamic i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|(dynamic i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(dynamic i) → self::Class
+static inline-class-member method Class|_#new#tearOff(dynamic i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|named(core::int i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|named(core::int i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|named(i);
-static inline-class-member method Class|redirect(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|fact(core::int i) → self::Class
+static inline-class-member method Class|fact(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|fact(i);
-static inline-class-member method Class|redirect2(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect2(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart:16:9: Error: Cannot invoke a non-'const' constructor where a const expression is expected.
diff --git a/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.weak.modular.expect
index c50e2a6d090..362c8de816d 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.weak.modular.expect
@@ -32,29 +32,29 @@ extension type Class(core::int i) {
   static redirecting-factory redirect2 = self::Class|redirect2;
   static tearoff redirect2 = self::Class|_#redirect2#tearOff;
 }
-static inline-class-member method Class|(dynamic i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|(dynamic i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(dynamic i) → self::Class
+static inline-class-member method Class|_#new#tearOff(dynamic i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|named(core::int i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|named(core::int i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|named(i);
-static inline-class-member method Class|redirect(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|fact(core::int i) → self::Class
+static inline-class-member method Class|fact(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|fact(i);
-static inline-class-member method Class|redirect2(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect2(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart:16:9: Error: Cannot invoke a non-'const' constructor where a const expression is expected.
diff --git a/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.weak.outline.expect
index c8e528810dc..f96841059d4 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.weak.outline.expect
@@ -14,25 +14,25 @@ extension type Class(core::int i) {
   static redirecting-factory redirect2 = self::Class|redirect2;
   static tearoff redirect2 = self::Class|_#redirect2#tearOff;
 }
-static inline-class-member method Class|(dynamic i) → self::Class
+static inline-class-member method Class|(dynamic i) → self::Class /* = core::int */
   ;
-static inline-class-member method Class|_#new#tearOff(dynamic i) → self::Class
+static inline-class-member method Class|_#new#tearOff(dynamic i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|named(core::int i) → self::Class
+static inline-class-member method Class|named(core::int i) → self::Class /* = core::int */
   ;
-static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|named(i);
-static inline-class-member method Class|redirect(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|fact(core::int i) → self::Class
+static inline-class-member method Class|fact(core::int i) → self::Class /* = core::int */
   ;
-static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|fact(i);
-static inline-class-member method Class|redirect2(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect2(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
 static method test() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.weak.transformed.expect
index c50e2a6d090..362c8de816d 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart.weak.transformed.expect
@@ -32,29 +32,29 @@ extension type Class(core::int i) {
   static redirecting-factory redirect2 = self::Class|redirect2;
   static tearoff redirect2 = self::Class|_#redirect2#tearOff;
 }
-static inline-class-member method Class|(dynamic i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|(dynamic i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(dynamic i) → self::Class
+static inline-class-member method Class|_#new#tearOff(dynamic i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|named(core::int i) → self::Class {
-  lowered final self::Class #this = i;
+static inline-class-member method Class|named(core::int i) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|named(i);
-static inline-class-member method Class|redirect(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|fact(core::int i) → self::Class
+static inline-class-member method Class|fact(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
-static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#fact#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|fact(i);
-static inline-class-member method Class|redirect2(core::int i) → self::Class /* redirection-target: self::Class| */
+static inline-class-member method Class|redirect2(core::int i) → self::Class /* = core::int */ /* redirection-target: self::Class| */
   return self::Class|(i);
-static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class
+static inline-class-member method Class|_#redirect2#tearOff(core::int i) → self::Class /* = core::int */
   return self::Class|(i);
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/extension_types/const_constructor.dart:16:9: Error: Cannot invoke a non-'const' constructor where a const expression is expected.
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.strong.expect
index 6ec44584fe7..ac0d23f91cc 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.strong.expect
@@ -12,43 +12,43 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::GenericClass|;
   tearoff • = self::GenericClass|_#new#tearOff;
 }
-static inline-class-member method Class|(dynamic it) → self::Class {
-  lowered final self::Class #this = it;
+static inline-class-member method Class|(dynamic it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(dynamic it) → self::Class
+static inline-class-member method Class|_#new#tearOff(dynamic it) → self::Class /* = core::int */
   return self::Class|(it);
-static inline-class-member method Class|named(core::int it) → self::Class {
-  lowered final self::Class #this = it.{core::num::+}(1){(core::num) → core::int};
+static inline-class-member method Class|named(core::int it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class /* = core::int */
   return self::Class|named(it);
-static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|::T%> {
-  lowered final self::GenericClass<self::GenericClass|::T%> #this = it;
+static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ {
+  lowered final self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
+static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%> /* = self::GenericClass|_#new#tearOff::T% */
   return self::GenericClass|<self::GenericClass|_#new#tearOff::T%>(it);
 static method main() → dynamic {
-  self::Class a = self::Class|(3);
-  self::Class b = self::Class|(4);
-  self::Class b2 = #C1(4){(dynamic) → self::Class};
-  self::Class c = self::Class|named(5);
-  self::Class c2 = #C2(5){(core::int) → self::Class};
-  self::GenericClass<core::String> d = self::GenericClass|<core::String>("foo");
-  self::GenericClass<core::String> d2 = #C4("foo"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> d3 = #C3<core::String>("foo"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e = self::GenericClass|<core::String>("bar");
-  self::GenericClass<core::String> e2 = #C4("bar"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e3 = #C3<core::String>("bar"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::int> f = self::GenericClass|<core::int>(42);
-  self::GenericClass<core::int> f2 = #C5(42){(dynamic) → self::GenericClass<core::int>};
-  self::GenericClass<core::int> f3 = #C3<core::int>(42){(dynamic) → self::GenericClass<core::int>};
-  self::GenericClass<dynamic> g = self::GenericClass|<dynamic>(87);
-  self::GenericClass<dynamic> g2 = #C3<dynamic>(87){(dynamic) → self::GenericClass<dynamic>};
-  self::GenericClass<core::num> h = self::GenericClass|<core::num>(123);
-  self::GenericClass<core::num> h2 = #C3<core::num>(123){(dynamic) → self::GenericClass<core::num>};
+  self::Class /* = core::int */ a = self::Class|(3);
+  self::Class /* = core::int */ b = self::Class|(4);
+  self::Class /* = core::int */ b2 = #C1(4){(dynamic) → self::Class /* = core::int */};
+  self::Class /* = core::int */ c = self::Class|named(5);
+  self::Class /* = core::int */ c2 = #C2(5){(core::int) → self::Class /* = core::int */};
+  self::GenericClass<core::String> /* = core::String */ d = self::GenericClass|<core::String>("foo");
+  self::GenericClass<core::String> /* = core::String */ d2 = #C4("foo"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ d3 = #C3<core::String>("foo"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e = self::GenericClass|<core::String>("bar");
+  self::GenericClass<core::String> /* = core::String */ e2 = #C4("bar"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e3 = #C3<core::String>("bar"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::int> /* = core::int */ f = self::GenericClass|<core::int>(42);
+  self::GenericClass<core::int> /* = core::int */ f2 = #C5(42){(dynamic) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::int> /* = core::int */ f3 = #C3<core::int>(42){(dynamic) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<dynamic> /* = dynamic */ g = self::GenericClass|<dynamic>(87);
+  self::GenericClass<dynamic> /* = dynamic */ g2 = #C3<dynamic>(87){(dynamic) → self::GenericClass<dynamic> /* = dynamic */};
+  self::GenericClass<core::num> /* = core::num */ h = self::GenericClass|<core::num>(123);
+  self::GenericClass<core::num> /* = core::num */ h2 = #C3<core::num>(123){(dynamic) → self::GenericClass<core::num> /* = core::num */};
   self::expect(3, a as{Unchecked} core::int);
   self::expect(3, a);
   self::expect(4, b as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.strong.transformed.expect
index 6ec44584fe7..ac0d23f91cc 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.strong.transformed.expect
@@ -12,43 +12,43 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::GenericClass|;
   tearoff • = self::GenericClass|_#new#tearOff;
 }
-static inline-class-member method Class|(dynamic it) → self::Class {
-  lowered final self::Class #this = it;
+static inline-class-member method Class|(dynamic it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(dynamic it) → self::Class
+static inline-class-member method Class|_#new#tearOff(dynamic it) → self::Class /* = core::int */
   return self::Class|(it);
-static inline-class-member method Class|named(core::int it) → self::Class {
-  lowered final self::Class #this = it.{core::num::+}(1){(core::num) → core::int};
+static inline-class-member method Class|named(core::int it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class /* = core::int */
   return self::Class|named(it);
-static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|::T%> {
-  lowered final self::GenericClass<self::GenericClass|::T%> #this = it;
+static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ {
+  lowered final self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
+static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%> /* = self::GenericClass|_#new#tearOff::T% */
   return self::GenericClass|<self::GenericClass|_#new#tearOff::T%>(it);
 static method main() → dynamic {
-  self::Class a = self::Class|(3);
-  self::Class b = self::Class|(4);
-  self::Class b2 = #C1(4){(dynamic) → self::Class};
-  self::Class c = self::Class|named(5);
-  self::Class c2 = #C2(5){(core::int) → self::Class};
-  self::GenericClass<core::String> d = self::GenericClass|<core::String>("foo");
-  self::GenericClass<core::String> d2 = #C4("foo"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> d3 = #C3<core::String>("foo"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e = self::GenericClass|<core::String>("bar");
-  self::GenericClass<core::String> e2 = #C4("bar"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e3 = #C3<core::String>("bar"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::int> f = self::GenericClass|<core::int>(42);
-  self::GenericClass<core::int> f2 = #C5(42){(dynamic) → self::GenericClass<core::int>};
-  self::GenericClass<core::int> f3 = #C3<core::int>(42){(dynamic) → self::GenericClass<core::int>};
-  self::GenericClass<dynamic> g = self::GenericClass|<dynamic>(87);
-  self::GenericClass<dynamic> g2 = #C3<dynamic>(87){(dynamic) → self::GenericClass<dynamic>};
-  self::GenericClass<core::num> h = self::GenericClass|<core::num>(123);
-  self::GenericClass<core::num> h2 = #C3<core::num>(123){(dynamic) → self::GenericClass<core::num>};
+  self::Class /* = core::int */ a = self::Class|(3);
+  self::Class /* = core::int */ b = self::Class|(4);
+  self::Class /* = core::int */ b2 = #C1(4){(dynamic) → self::Class /* = core::int */};
+  self::Class /* = core::int */ c = self::Class|named(5);
+  self::Class /* = core::int */ c2 = #C2(5){(core::int) → self::Class /* = core::int */};
+  self::GenericClass<core::String> /* = core::String */ d = self::GenericClass|<core::String>("foo");
+  self::GenericClass<core::String> /* = core::String */ d2 = #C4("foo"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ d3 = #C3<core::String>("foo"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e = self::GenericClass|<core::String>("bar");
+  self::GenericClass<core::String> /* = core::String */ e2 = #C4("bar"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e3 = #C3<core::String>("bar"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::int> /* = core::int */ f = self::GenericClass|<core::int>(42);
+  self::GenericClass<core::int> /* = core::int */ f2 = #C5(42){(dynamic) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::int> /* = core::int */ f3 = #C3<core::int>(42){(dynamic) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<dynamic> /* = dynamic */ g = self::GenericClass|<dynamic>(87);
+  self::GenericClass<dynamic> /* = dynamic */ g2 = #C3<dynamic>(87){(dynamic) → self::GenericClass<dynamic> /* = dynamic */};
+  self::GenericClass<core::num> /* = core::num */ h = self::GenericClass|<core::num>(123);
+  self::GenericClass<core::num> /* = core::num */ h2 = #C3<core::num>(123){(dynamic) → self::GenericClass<core::num> /* = core::num */};
   self::expect(3, a as{Unchecked} core::int);
   self::expect(3, a);
   self::expect(4, b as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.weak.expect
index b28b48db08a..4a60fd4d9c2 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.weak.expect
@@ -12,43 +12,43 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::GenericClass|;
   tearoff • = self::GenericClass|_#new#tearOff;
 }
-static inline-class-member method Class|(dynamic it) → self::Class {
-  lowered final self::Class #this = it;
+static inline-class-member method Class|(dynamic it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(dynamic it) → self::Class
+static inline-class-member method Class|_#new#tearOff(dynamic it) → self::Class /* = core::int */
   return self::Class|(it);
-static inline-class-member method Class|named(core::int it) → self::Class {
-  lowered final self::Class #this = it.{core::num::+}(1){(core::num) → core::int};
+static inline-class-member method Class|named(core::int it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class /* = core::int */
   return self::Class|named(it);
-static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|::T%> {
-  lowered final self::GenericClass<self::GenericClass|::T%> #this = it;
+static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ {
+  lowered final self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
+static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%> /* = self::GenericClass|_#new#tearOff::T% */
   return self::GenericClass|<self::GenericClass|_#new#tearOff::T%>(it);
 static method main() → dynamic {
-  self::Class a = self::Class|(3);
-  self::Class b = self::Class|(4);
-  self::Class b2 = #C1(4){(dynamic) → self::Class};
-  self::Class c = self::Class|named(5);
-  self::Class c2 = #C2(5){(core::int) → self::Class};
-  self::GenericClass<core::String> d = self::GenericClass|<core::String>("foo");
-  self::GenericClass<core::String> d2 = #C4("foo"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> d3 = #C3<core::String>("foo"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e = self::GenericClass|<core::String>("bar");
-  self::GenericClass<core::String> e2 = #C4("bar"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e3 = #C3<core::String>("bar"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::int> f = self::GenericClass|<core::int>(42);
-  self::GenericClass<core::int> f2 = #C5(42){(dynamic) → self::GenericClass<core::int>};
-  self::GenericClass<core::int> f3 = #C3<core::int>(42){(dynamic) → self::GenericClass<core::int>};
-  self::GenericClass<dynamic> g = self::GenericClass|<dynamic>(87);
-  self::GenericClass<dynamic> g2 = #C3<dynamic>(87){(dynamic) → self::GenericClass<dynamic>};
-  self::GenericClass<core::num> h = self::GenericClass|<core::num>(123);
-  self::GenericClass<core::num> h2 = #C3<core::num>(123){(dynamic) → self::GenericClass<core::num>};
+  self::Class /* = core::int */ a = self::Class|(3);
+  self::Class /* = core::int */ b = self::Class|(4);
+  self::Class /* = core::int */ b2 = #C1(4){(dynamic) → self::Class /* = core::int */};
+  self::Class /* = core::int */ c = self::Class|named(5);
+  self::Class /* = core::int */ c2 = #C2(5){(core::int) → self::Class /* = core::int */};
+  self::GenericClass<core::String> /* = core::String */ d = self::GenericClass|<core::String>("foo");
+  self::GenericClass<core::String> /* = core::String */ d2 = #C4("foo"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ d3 = #C3<core::String>("foo"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e = self::GenericClass|<core::String>("bar");
+  self::GenericClass<core::String> /* = core::String */ e2 = #C4("bar"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e3 = #C3<core::String>("bar"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::int> /* = core::int */ f = self::GenericClass|<core::int>(42);
+  self::GenericClass<core::int> /* = core::int */ f2 = #C5(42){(dynamic) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::int> /* = core::int */ f3 = #C3<core::int>(42){(dynamic) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<dynamic> /* = dynamic */ g = self::GenericClass|<dynamic>(87);
+  self::GenericClass<dynamic> /* = dynamic */ g2 = #C3<dynamic>(87){(dynamic) → self::GenericClass<dynamic> /* = dynamic */};
+  self::GenericClass<core::num> /* = core::num */ h = self::GenericClass|<core::num>(123);
+  self::GenericClass<core::num> /* = core::num */ h2 = #C3<core::num>(123){(dynamic) → self::GenericClass<core::num> /* = core::num */};
   self::expect(3, a as{Unchecked} core::int);
   self::expect(3, a);
   self::expect(4, b as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.weak.modular.expect
index b28b48db08a..4a60fd4d9c2 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.weak.modular.expect
@@ -12,43 +12,43 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::GenericClass|;
   tearoff • = self::GenericClass|_#new#tearOff;
 }
-static inline-class-member method Class|(dynamic it) → self::Class {
-  lowered final self::Class #this = it;
+static inline-class-member method Class|(dynamic it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(dynamic it) → self::Class
+static inline-class-member method Class|_#new#tearOff(dynamic it) → self::Class /* = core::int */
   return self::Class|(it);
-static inline-class-member method Class|named(core::int it) → self::Class {
-  lowered final self::Class #this = it.{core::num::+}(1){(core::num) → core::int};
+static inline-class-member method Class|named(core::int it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class /* = core::int */
   return self::Class|named(it);
-static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|::T%> {
-  lowered final self::GenericClass<self::GenericClass|::T%> #this = it;
+static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ {
+  lowered final self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
+static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%> /* = self::GenericClass|_#new#tearOff::T% */
   return self::GenericClass|<self::GenericClass|_#new#tearOff::T%>(it);
 static method main() → dynamic {
-  self::Class a = self::Class|(3);
-  self::Class b = self::Class|(4);
-  self::Class b2 = #C1(4){(dynamic) → self::Class};
-  self::Class c = self::Class|named(5);
-  self::Class c2 = #C2(5){(core::int) → self::Class};
-  self::GenericClass<core::String> d = self::GenericClass|<core::String>("foo");
-  self::GenericClass<core::String> d2 = #C4("foo"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> d3 = #C3<core::String>("foo"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e = self::GenericClass|<core::String>("bar");
-  self::GenericClass<core::String> e2 = #C4("bar"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e3 = #C3<core::String>("bar"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::int> f = self::GenericClass|<core::int>(42);
-  self::GenericClass<core::int> f2 = #C5(42){(dynamic) → self::GenericClass<core::int>};
-  self::GenericClass<core::int> f3 = #C3<core::int>(42){(dynamic) → self::GenericClass<core::int>};
-  self::GenericClass<dynamic> g = self::GenericClass|<dynamic>(87);
-  self::GenericClass<dynamic> g2 = #C3<dynamic>(87){(dynamic) → self::GenericClass<dynamic>};
-  self::GenericClass<core::num> h = self::GenericClass|<core::num>(123);
-  self::GenericClass<core::num> h2 = #C3<core::num>(123){(dynamic) → self::GenericClass<core::num>};
+  self::Class /* = core::int */ a = self::Class|(3);
+  self::Class /* = core::int */ b = self::Class|(4);
+  self::Class /* = core::int */ b2 = #C1(4){(dynamic) → self::Class /* = core::int */};
+  self::Class /* = core::int */ c = self::Class|named(5);
+  self::Class /* = core::int */ c2 = #C2(5){(core::int) → self::Class /* = core::int */};
+  self::GenericClass<core::String> /* = core::String */ d = self::GenericClass|<core::String>("foo");
+  self::GenericClass<core::String> /* = core::String */ d2 = #C4("foo"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ d3 = #C3<core::String>("foo"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e = self::GenericClass|<core::String>("bar");
+  self::GenericClass<core::String> /* = core::String */ e2 = #C4("bar"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e3 = #C3<core::String>("bar"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::int> /* = core::int */ f = self::GenericClass|<core::int>(42);
+  self::GenericClass<core::int> /* = core::int */ f2 = #C5(42){(dynamic) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::int> /* = core::int */ f3 = #C3<core::int>(42){(dynamic) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<dynamic> /* = dynamic */ g = self::GenericClass|<dynamic>(87);
+  self::GenericClass<dynamic> /* = dynamic */ g2 = #C3<dynamic>(87){(dynamic) → self::GenericClass<dynamic> /* = dynamic */};
+  self::GenericClass<core::num> /* = core::num */ h = self::GenericClass|<core::num>(123);
+  self::GenericClass<core::num> /* = core::num */ h2 = #C3<core::num>(123){(dynamic) → self::GenericClass<core::num> /* = core::num */};
   self::expect(3, a as{Unchecked} core::int);
   self::expect(3, a);
   self::expect(4, b as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.weak.outline.expect
index ba770cfb88f..b07424b6dd5 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.weak.outline.expect
@@ -12,17 +12,17 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::GenericClass|;
   tearoff • = self::GenericClass|_#new#tearOff;
 }
-static inline-class-member method Class|(dynamic it) → self::Class
+static inline-class-member method Class|(dynamic it) → self::Class /* = core::int */
   ;
-static inline-class-member method Class|_#new#tearOff(dynamic it) → self::Class
+static inline-class-member method Class|_#new#tearOff(dynamic it) → self::Class /* = core::int */
   return self::Class|(it);
-static inline-class-member method Class|named(core::int it) → self::Class
+static inline-class-member method Class|named(core::int it) → self::Class /* = core::int */
   ;
-static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class /* = core::int */
   return self::Class|named(it);
-static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|::T%>
+static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */
   ;
-static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
+static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%> /* = self::GenericClass|_#new#tearOff::T% */
   return self::GenericClass|<self::GenericClass|_#new#tearOff::T%>(it);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.weak.transformed.expect
index b28b48db08a..4a60fd4d9c2 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructor_access.dart.weak.transformed.expect
@@ -12,43 +12,43 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::GenericClass|;
   tearoff • = self::GenericClass|_#new#tearOff;
 }
-static inline-class-member method Class|(dynamic it) → self::Class {
-  lowered final self::Class #this = it;
+static inline-class-member method Class|(dynamic it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class|_#new#tearOff(dynamic it) → self::Class
+static inline-class-member method Class|_#new#tearOff(dynamic it) → self::Class /* = core::int */
   return self::Class|(it);
-static inline-class-member method Class|named(core::int it) → self::Class {
-  lowered final self::Class #this = it.{core::num::+}(1){(core::num) → core::int};
+static inline-class-member method Class|named(core::int it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class /* = core::int */
   return self::Class|named(it);
-static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|::T%> {
-  lowered final self::GenericClass<self::GenericClass|::T%> #this = it;
+static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ {
+  lowered final self::GenericClass<self::GenericClass|::T%> /* = self::GenericClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
+static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%> /* = self::GenericClass|_#new#tearOff::T% */
   return self::GenericClass|<self::GenericClass|_#new#tearOff::T%>(it);
 static method main() → dynamic {
-  self::Class a = self::Class|(3);
-  self::Class b = self::Class|(4);
-  self::Class b2 = #C1(4){(dynamic) → self::Class};
-  self::Class c = self::Class|named(5);
-  self::Class c2 = #C2(5){(core::int) → self::Class};
-  self::GenericClass<core::String> d = self::GenericClass|<core::String>("foo");
-  self::GenericClass<core::String> d2 = #C4("foo"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> d3 = #C3<core::String>("foo"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e = self::GenericClass|<core::String>("bar");
-  self::GenericClass<core::String> e2 = #C4("bar"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::String> e3 = #C3<core::String>("bar"){(dynamic) → self::GenericClass<core::String>};
-  self::GenericClass<core::int> f = self::GenericClass|<core::int>(42);
-  self::GenericClass<core::int> f2 = #C5(42){(dynamic) → self::GenericClass<core::int>};
-  self::GenericClass<core::int> f3 = #C3<core::int>(42){(dynamic) → self::GenericClass<core::int>};
-  self::GenericClass<dynamic> g = self::GenericClass|<dynamic>(87);
-  self::GenericClass<dynamic> g2 = #C3<dynamic>(87){(dynamic) → self::GenericClass<dynamic>};
-  self::GenericClass<core::num> h = self::GenericClass|<core::num>(123);
-  self::GenericClass<core::num> h2 = #C3<core::num>(123){(dynamic) → self::GenericClass<core::num>};
+  self::Class /* = core::int */ a = self::Class|(3);
+  self::Class /* = core::int */ b = self::Class|(4);
+  self::Class /* = core::int */ b2 = #C1(4){(dynamic) → self::Class /* = core::int */};
+  self::Class /* = core::int */ c = self::Class|named(5);
+  self::Class /* = core::int */ c2 = #C2(5){(core::int) → self::Class /* = core::int */};
+  self::GenericClass<core::String> /* = core::String */ d = self::GenericClass|<core::String>("foo");
+  self::GenericClass<core::String> /* = core::String */ d2 = #C4("foo"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ d3 = #C3<core::String>("foo"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e = self::GenericClass|<core::String>("bar");
+  self::GenericClass<core::String> /* = core::String */ e2 = #C4("bar"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::String> /* = core::String */ e3 = #C3<core::String>("bar"){(dynamic) → self::GenericClass<core::String> /* = core::String */};
+  self::GenericClass<core::int> /* = core::int */ f = self::GenericClass|<core::int>(42);
+  self::GenericClass<core::int> /* = core::int */ f2 = #C5(42){(dynamic) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<core::int> /* = core::int */ f3 = #C3<core::int>(42){(dynamic) → self::GenericClass<core::int> /* = core::int */};
+  self::GenericClass<dynamic> /* = dynamic */ g = self::GenericClass|<dynamic>(87);
+  self::GenericClass<dynamic> /* = dynamic */ g2 = #C3<dynamic>(87){(dynamic) → self::GenericClass<dynamic> /* = dynamic */};
+  self::GenericClass<core::num> /* = core::num */ h = self::GenericClass|<core::num>(123);
+  self::GenericClass<core::num> /* = core::num */ h2 = #C3<core::num>(123){(dynamic) → self::GenericClass<core::num> /* = core::num */};
   self::expect(3, a as{Unchecked} core::int);
   self::expect(3, a);
   self::expect(4, b as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.strong.expect
index 68afa1a4247..5ed48c623dc 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.strong.expect
@@ -34,99 +34,99 @@ extension type Class2<T extends core::Object? = dynamic>(T% it) {
   constructor named6 = self::Class2|named6;
   tearoff named6 = self::Class2|_#named6#tearOff;
 }
-static inline-class-member method Class1|(dynamic it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(dynamic it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named1(it, additional);
-static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named2(it, additional);
-static inline-class-member method Class1|named3(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named3(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|named3(it);
-static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named4(additional, it);
-static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named5(additional, it);
-static inline-class-member method Class1|named6(core::String text) → self::Class1 {
-  lowered final self::Class1 #this = text.{core::String::length}{core::int};
+static inline-class-member method Class1|named6(core::String text) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = text.{core::String::length}{core::int};
   return #this;
 }
-static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1
+static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1 /* = core::int */
   return self::Class1|named6(text);
-static inline-class-member method Class2|<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|::T%> {
-  lowered final self::Class2<self::Class2|::T%> #this = it;
+static inline-class-member method Class2|<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ {
+  lowered final self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|_#new#tearOff::T%>
+static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|_#new#tearOff::T%> /* = self::Class2|_#new#tearOff::T% */
   return self::Class2|<self::Class2|_#new#tearOff::T%>(it);
-static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
-  lowered final self::Class2<self::Class2|named1::T%> #this = it;
+static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ {
+  lowered final self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
+static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%> /* = self::Class2|_#named1#tearOff::T% */
   return self::Class2|named1<self::Class2|_#named1#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
-  lowered final self::Class2<self::Class2|named2::T%> #this = it;
+static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ {
+  lowered final self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
+static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%> /* = self::Class2|_#named2#tearOff::T% */
   return self::Class2|named2<self::Class2|_#named2#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
-  lowered final self::Class2<self::Class2|named3::T%> #this = it;
+static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ {
+  lowered final self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
+static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%> /* = self::Class2|_#named3#tearOff::T% */
   return self::Class2|named3<self::Class2|_#named3#tearOff::T%>(it);
-static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
-  lowered final self::Class2<self::Class2|named4::T%> #this = it;
+static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ {
+  lowered final self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
+static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%> /* = self::Class2|_#named4#tearOff::T% */
   return self::Class2|named4<self::Class2|_#named4#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
-  lowered final self::Class2<self::Class2|named5::T%> #this = it;
+static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ {
+  lowered final self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
+static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%> /* = self::Class2|_#named5#tearOff::T% */
   return self::Class2|named5<self::Class2|_#named5#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
-  lowered final self::Class2<self::Class2|named6::T%> #this = list.{core::Iterable::first}{self::Class2|named6::T%};
+static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ {
+  lowered final self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ #this = list.{core::Iterable::first}{self::Class2|named6::T%};
   return #this;
 }
-static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
+static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%> /* = self::Class2|_#named6#tearOff::T% */
   return self::Class2|named6<self::Class2|_#named6#tearOff::T%>(list);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.strong.transformed.expect
index 68afa1a4247..5ed48c623dc 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.strong.transformed.expect
@@ -34,99 +34,99 @@ extension type Class2<T extends core::Object? = dynamic>(T% it) {
   constructor named6 = self::Class2|named6;
   tearoff named6 = self::Class2|_#named6#tearOff;
 }
-static inline-class-member method Class1|(dynamic it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(dynamic it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named1(it, additional);
-static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named2(it, additional);
-static inline-class-member method Class1|named3(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named3(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|named3(it);
-static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named4(additional, it);
-static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named5(additional, it);
-static inline-class-member method Class1|named6(core::String text) → self::Class1 {
-  lowered final self::Class1 #this = text.{core::String::length}{core::int};
+static inline-class-member method Class1|named6(core::String text) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = text.{core::String::length}{core::int};
   return #this;
 }
-static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1
+static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1 /* = core::int */
   return self::Class1|named6(text);
-static inline-class-member method Class2|<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|::T%> {
-  lowered final self::Class2<self::Class2|::T%> #this = it;
+static inline-class-member method Class2|<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ {
+  lowered final self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|_#new#tearOff::T%>
+static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|_#new#tearOff::T%> /* = self::Class2|_#new#tearOff::T% */
   return self::Class2|<self::Class2|_#new#tearOff::T%>(it);
-static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
-  lowered final self::Class2<self::Class2|named1::T%> #this = it;
+static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ {
+  lowered final self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
+static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%> /* = self::Class2|_#named1#tearOff::T% */
   return self::Class2|named1<self::Class2|_#named1#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
-  lowered final self::Class2<self::Class2|named2::T%> #this = it;
+static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ {
+  lowered final self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
+static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%> /* = self::Class2|_#named2#tearOff::T% */
   return self::Class2|named2<self::Class2|_#named2#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
-  lowered final self::Class2<self::Class2|named3::T%> #this = it;
+static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ {
+  lowered final self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
+static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%> /* = self::Class2|_#named3#tearOff::T% */
   return self::Class2|named3<self::Class2|_#named3#tearOff::T%>(it);
-static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
-  lowered final self::Class2<self::Class2|named4::T%> #this = it;
+static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ {
+  lowered final self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
+static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%> /* = self::Class2|_#named4#tearOff::T% */
   return self::Class2|named4<self::Class2|_#named4#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
-  lowered final self::Class2<self::Class2|named5::T%> #this = it;
+static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ {
+  lowered final self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
+static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%> /* = self::Class2|_#named5#tearOff::T% */
   return self::Class2|named5<self::Class2|_#named5#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
-  lowered final self::Class2<self::Class2|named6::T%> #this = list.{core::Iterable::first}{self::Class2|named6::T%};
+static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ {
+  lowered final self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ #this = list.{core::Iterable::first}{self::Class2|named6::T%};
   return #this;
 }
-static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
+static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%> /* = self::Class2|_#named6#tearOff::T% */
   return self::Class2|named6<self::Class2|_#named6#tearOff::T%>(list);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.weak.expect
index 68afa1a4247..5ed48c623dc 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.weak.expect
@@ -34,99 +34,99 @@ extension type Class2<T extends core::Object? = dynamic>(T% it) {
   constructor named6 = self::Class2|named6;
   tearoff named6 = self::Class2|_#named6#tearOff;
 }
-static inline-class-member method Class1|(dynamic it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(dynamic it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named1(it, additional);
-static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named2(it, additional);
-static inline-class-member method Class1|named3(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named3(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|named3(it);
-static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named4(additional, it);
-static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named5(additional, it);
-static inline-class-member method Class1|named6(core::String text) → self::Class1 {
-  lowered final self::Class1 #this = text.{core::String::length}{core::int};
+static inline-class-member method Class1|named6(core::String text) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = text.{core::String::length}{core::int};
   return #this;
 }
-static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1
+static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1 /* = core::int */
   return self::Class1|named6(text);
-static inline-class-member method Class2|<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|::T%> {
-  lowered final self::Class2<self::Class2|::T%> #this = it;
+static inline-class-member method Class2|<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ {
+  lowered final self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|_#new#tearOff::T%>
+static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|_#new#tearOff::T%> /* = self::Class2|_#new#tearOff::T% */
   return self::Class2|<self::Class2|_#new#tearOff::T%>(it);
-static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
-  lowered final self::Class2<self::Class2|named1::T%> #this = it;
+static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ {
+  lowered final self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
+static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%> /* = self::Class2|_#named1#tearOff::T% */
   return self::Class2|named1<self::Class2|_#named1#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
-  lowered final self::Class2<self::Class2|named2::T%> #this = it;
+static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ {
+  lowered final self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
+static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%> /* = self::Class2|_#named2#tearOff::T% */
   return self::Class2|named2<self::Class2|_#named2#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
-  lowered final self::Class2<self::Class2|named3::T%> #this = it;
+static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ {
+  lowered final self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
+static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%> /* = self::Class2|_#named3#tearOff::T% */
   return self::Class2|named3<self::Class2|_#named3#tearOff::T%>(it);
-static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
-  lowered final self::Class2<self::Class2|named4::T%> #this = it;
+static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ {
+  lowered final self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
+static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%> /* = self::Class2|_#named4#tearOff::T% */
   return self::Class2|named4<self::Class2|_#named4#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
-  lowered final self::Class2<self::Class2|named5::T%> #this = it;
+static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ {
+  lowered final self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
+static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%> /* = self::Class2|_#named5#tearOff::T% */
   return self::Class2|named5<self::Class2|_#named5#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
-  lowered final self::Class2<self::Class2|named6::T%> #this = list.{core::Iterable::first}{self::Class2|named6::T%};
+static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ {
+  lowered final self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ #this = list.{core::Iterable::first}{self::Class2|named6::T%};
   return #this;
 }
-static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
+static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%> /* = self::Class2|_#named6#tearOff::T% */
   return self::Class2|named6<self::Class2|_#named6#tearOff::T%>(list);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.weak.modular.expect
index 68afa1a4247..5ed48c623dc 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.weak.modular.expect
@@ -34,99 +34,99 @@ extension type Class2<T extends core::Object? = dynamic>(T% it) {
   constructor named6 = self::Class2|named6;
   tearoff named6 = self::Class2|_#named6#tearOff;
 }
-static inline-class-member method Class1|(dynamic it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(dynamic it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named1(it, additional);
-static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named2(it, additional);
-static inline-class-member method Class1|named3(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named3(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|named3(it);
-static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named4(additional, it);
-static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named5(additional, it);
-static inline-class-member method Class1|named6(core::String text) → self::Class1 {
-  lowered final self::Class1 #this = text.{core::String::length}{core::int};
+static inline-class-member method Class1|named6(core::String text) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = text.{core::String::length}{core::int};
   return #this;
 }
-static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1
+static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1 /* = core::int */
   return self::Class1|named6(text);
-static inline-class-member method Class2|<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|::T%> {
-  lowered final self::Class2<self::Class2|::T%> #this = it;
+static inline-class-member method Class2|<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ {
+  lowered final self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|_#new#tearOff::T%>
+static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|_#new#tearOff::T%> /* = self::Class2|_#new#tearOff::T% */
   return self::Class2|<self::Class2|_#new#tearOff::T%>(it);
-static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
-  lowered final self::Class2<self::Class2|named1::T%> #this = it;
+static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ {
+  lowered final self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
+static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%> /* = self::Class2|_#named1#tearOff::T% */
   return self::Class2|named1<self::Class2|_#named1#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
-  lowered final self::Class2<self::Class2|named2::T%> #this = it;
+static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ {
+  lowered final self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
+static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%> /* = self::Class2|_#named2#tearOff::T% */
   return self::Class2|named2<self::Class2|_#named2#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
-  lowered final self::Class2<self::Class2|named3::T%> #this = it;
+static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ {
+  lowered final self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
+static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%> /* = self::Class2|_#named3#tearOff::T% */
   return self::Class2|named3<self::Class2|_#named3#tearOff::T%>(it);
-static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
-  lowered final self::Class2<self::Class2|named4::T%> #this = it;
+static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ {
+  lowered final self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
+static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%> /* = self::Class2|_#named4#tearOff::T% */
   return self::Class2|named4<self::Class2|_#named4#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
-  lowered final self::Class2<self::Class2|named5::T%> #this = it;
+static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ {
+  lowered final self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
+static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%> /* = self::Class2|_#named5#tearOff::T% */
   return self::Class2|named5<self::Class2|_#named5#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
-  lowered final self::Class2<self::Class2|named6::T%> #this = list.{core::Iterable::first}{self::Class2|named6::T%};
+static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ {
+  lowered final self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ #this = list.{core::Iterable::first}{self::Class2|named6::T%};
   return #this;
 }
-static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
+static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%> /* = self::Class2|_#named6#tearOff::T% */
   return self::Class2|named6<self::Class2|_#named6#tearOff::T%>(list);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.weak.outline.expect
index 75c262a6942..836e124a98e 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.weak.outline.expect
@@ -34,59 +34,59 @@ extension type Class2<T extends core::Object? = dynamic>(T% it) {
   constructor named6 = self::Class2|named6;
   tearoff named6 = self::Class2|_#named6#tearOff;
 }
-static inline-class-member method Class1|(dynamic it) → self::Class1
+static inline-class-member method Class1|(dynamic it) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named1(it, additional);
-static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named2(it, additional);
-static inline-class-member method Class1|named3(core::int it) → self::Class1
+static inline-class-member method Class1|named3(core::int it) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|named3(it);
-static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named4(additional, it);
-static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named5(additional, it);
-static inline-class-member method Class1|named6(core::String text) → self::Class1
+static inline-class-member method Class1|named6(core::String text) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1
+static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1 /* = core::int */
   return self::Class1|named6(text);
-static inline-class-member method Class2|<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|::T%>
+static inline-class-member method Class2|<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|::T%> /* = self::Class2|::T% */
   ;
-static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|_#new#tearOff::T%>
+static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|_#new#tearOff::T%> /* = self::Class2|_#new#tearOff::T% */
   return self::Class2|<self::Class2|_#new#tearOff::T%>(it);
-static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%>
+static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */
   ;
-static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
+static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%> /* = self::Class2|_#named1#tearOff::T% */
   return self::Class2|named1<self::Class2|_#named1#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%>
+static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */
   ;
-static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
+static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%> /* = self::Class2|_#named2#tearOff::T% */
   return self::Class2|named2<self::Class2|_#named2#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%>
+static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */
   ;
-static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
+static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%> /* = self::Class2|_#named3#tearOff::T% */
   return self::Class2|named3<self::Class2|_#named3#tearOff::T%>(it);
-static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%>
+static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */
   ;
-static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
+static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%> /* = self::Class2|_#named4#tearOff::T% */
   return self::Class2|named4<self::Class2|_#named4#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%>
+static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */
   ;
-static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
+static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%> /* = self::Class2|_#named5#tearOff::T% */
   return self::Class2|named5<self::Class2|_#named5#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%>
+static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */
   ;
-static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
+static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%> /* = self::Class2|_#named6#tearOff::T% */
   return self::Class2|named6<self::Class2|_#named6#tearOff::T%>(list);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.weak.transformed.expect
index 68afa1a4247..5ed48c623dc 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructor_bodies.dart.weak.transformed.expect
@@ -34,99 +34,99 @@ extension type Class2<T extends core::Object? = dynamic>(T% it) {
   constructor named6 = self::Class2|named6;
   tearoff named6 = self::Class2|_#named6#tearOff;
 }
-static inline-class-member method Class1|(dynamic it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(dynamic it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named1(it, additional);
-static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1 /* = core::int */
   return self::Class1|named2(it, additional);
-static inline-class-member method Class1|named3(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named3(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|named3(it);
-static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named4(additional, it);
-static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1 /* = core::int */
   return self::Class1|named5(additional, it);
-static inline-class-member method Class1|named6(core::String text) → self::Class1 {
-  lowered final self::Class1 #this = text.{core::String::length}{core::int};
+static inline-class-member method Class1|named6(core::String text) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = text.{core::String::length}{core::int};
   return #this;
 }
-static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1
+static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1 /* = core::int */
   return self::Class1|named6(text);
-static inline-class-member method Class2|<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|::T%> {
-  lowered final self::Class2<self::Class2|::T%> #this = it;
+static inline-class-member method Class2|<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ {
+  lowered final self::Class2<self::Class2|::T%> /* = self::Class2|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|_#new#tearOff::T%>
+static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class2<self::Class2|_#new#tearOff::T%> /* = self::Class2|_#new#tearOff::T% */
   return self::Class2|<self::Class2|_#new#tearOff::T%>(it);
-static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
-  lowered final self::Class2<self::Class2|named1::T%> #this = it;
+static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ {
+  lowered final self::Class2<self::Class2|named1::T%> /* = self::Class2|named1::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
+static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%> /* = self::Class2|_#named1#tearOff::T% */
   return self::Class2|named1<self::Class2|_#named1#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
-  lowered final self::Class2<self::Class2|named2::T%> #this = it;
+static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ {
+  lowered final self::Class2<self::Class2|named2::T%> /* = self::Class2|named2::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
+static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%> /* = self::Class2|_#named2#tearOff::T% */
   return self::Class2|named2<self::Class2|_#named2#tearOff::T%>(it, additional);
-static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
-  lowered final self::Class2<self::Class2|named3::T%> #this = it;
+static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ {
+  lowered final self::Class2<self::Class2|named3::T%> /* = self::Class2|named3::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
+static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%> /* = self::Class2|_#named3#tearOff::T% */
   return self::Class2|named3<self::Class2|_#named3#tearOff::T%>(it);
-static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
-  lowered final self::Class2<self::Class2|named4::T%> #this = it;
+static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ {
+  lowered final self::Class2<self::Class2|named4::T%> /* = self::Class2|named4::T% */ #this = it;
   return #this;
 }
-static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
+static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%> /* = self::Class2|_#named4#tearOff::T% */
   return self::Class2|named4<self::Class2|_#named4#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
-  lowered final self::Class2<self::Class2|named5::T%> #this = it;
+static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ {
+  lowered final self::Class2<self::Class2|named5::T%> /* = self::Class2|named5::T% */ #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
+static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%> /* = self::Class2|_#named5#tearOff::T% */
   return self::Class2|named5<self::Class2|_#named5#tearOff::T%>(additional, it);
-static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
-  lowered final self::Class2<self::Class2|named6::T%> #this = list.{core::Iterable::first}{self::Class2|named6::T%};
+static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ {
+  lowered final self::Class2<self::Class2|named6::T%> /* = self::Class2|named6::T% */ #this = list.{core::Iterable::first}{self::Class2|named6::T%};
   return #this;
 }
-static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
+static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%> /* = self::Class2|_#named6#tearOff::T% */
   return self::Class2|named6<self::Class2|_#named6#tearOff::T%>(list);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.strong.expect
index e67c62cdd3d..769ed61b6f4 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.strong.expect
@@ -18,35 +18,35 @@ extension type I2(core::int it) {
   constructor • = self::I2|;
   tearoff • = self::I2|_#new#tearOff;
 }
-static inline-class-member method I|_(dynamic it) → self::I {
-  lowered final self::I #this = it;
+static inline-class-member method I|_(dynamic it) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method I|_#_#tearOff(dynamic it) → self::I
+static inline-class-member method I|_#_#tearOff(dynamic it) → self::I /* = core::int */
   return self::I|_(it);
-static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I {
-  lowered final self::I #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
+static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
+static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I /* = core::int */
   return self::I|(x, y);
-static inline-class-member method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
-static inline-class-member method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
+static inline-class-member method I|m(lowered final self::I /* = core::int */ #this, core::String s, [core::int i = #C2]) → void {}
+static inline-class-member method I|get#m(lowered final self::I /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C2]) → void => self::I|m(#this, s, i);
-static inline-class-member method I2|_(dynamic it) → self::I2 {
-  lowered final self::I2 #this = it;
+static inline-class-member method I2|_(dynamic it) → self::I2 /* = core::int */ {
+  lowered final self::I2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method I2|_#_#tearOff(dynamic it) → self::I2
+static inline-class-member method I2|_#_#tearOff(dynamic it) → self::I2 /* = core::int */
   return self::I2|_(it);
-static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
-  lowered final self::I2 #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
+static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 /* = core::int */ {
+  lowered final self::I2 /* = core::int */ #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
+static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2 /* = core::int */
   return self::I2|(x, y: y);
-static inline-class-member method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
-static inline-class-member method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
+static inline-class-member method I2|m(lowered final self::I2 /* = core::int */ #this, core::String s, {core::int i = #C2}) → void {}
+static inline-class-member method I2|get#m(lowered final self::I2 /* = core::int */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C2}) → void => self::I2|m(#this, s, i: i);
 static method main() → dynamic {
   self::expect(42, self::I|(0));
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.strong.transformed.expect
index e67c62cdd3d..769ed61b6f4 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.strong.transformed.expect
@@ -18,35 +18,35 @@ extension type I2(core::int it) {
   constructor • = self::I2|;
   tearoff • = self::I2|_#new#tearOff;
 }
-static inline-class-member method I|_(dynamic it) → self::I {
-  lowered final self::I #this = it;
+static inline-class-member method I|_(dynamic it) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method I|_#_#tearOff(dynamic it) → self::I
+static inline-class-member method I|_#_#tearOff(dynamic it) → self::I /* = core::int */
   return self::I|_(it);
-static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I {
-  lowered final self::I #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
+static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
+static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I /* = core::int */
   return self::I|(x, y);
-static inline-class-member method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
-static inline-class-member method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
+static inline-class-member method I|m(lowered final self::I /* = core::int */ #this, core::String s, [core::int i = #C2]) → void {}
+static inline-class-member method I|get#m(lowered final self::I /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C2]) → void => self::I|m(#this, s, i);
-static inline-class-member method I2|_(dynamic it) → self::I2 {
-  lowered final self::I2 #this = it;
+static inline-class-member method I2|_(dynamic it) → self::I2 /* = core::int */ {
+  lowered final self::I2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method I2|_#_#tearOff(dynamic it) → self::I2
+static inline-class-member method I2|_#_#tearOff(dynamic it) → self::I2 /* = core::int */
   return self::I2|_(it);
-static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
-  lowered final self::I2 #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
+static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 /* = core::int */ {
+  lowered final self::I2 /* = core::int */ #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
+static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2 /* = core::int */
   return self::I2|(x, y: y);
-static inline-class-member method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
-static inline-class-member method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
+static inline-class-member method I2|m(lowered final self::I2 /* = core::int */ #this, core::String s, {core::int i = #C2}) → void {}
+static inline-class-member method I2|get#m(lowered final self::I2 /* = core::int */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C2}) → void => self::I2|m(#this, s, i: i);
 static method main() → dynamic {
   self::expect(42, self::I|(0));
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.weak.expect
index e67c62cdd3d..769ed61b6f4 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.weak.expect
@@ -18,35 +18,35 @@ extension type I2(core::int it) {
   constructor • = self::I2|;
   tearoff • = self::I2|_#new#tearOff;
 }
-static inline-class-member method I|_(dynamic it) → self::I {
-  lowered final self::I #this = it;
+static inline-class-member method I|_(dynamic it) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method I|_#_#tearOff(dynamic it) → self::I
+static inline-class-member method I|_#_#tearOff(dynamic it) → self::I /* = core::int */
   return self::I|_(it);
-static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I {
-  lowered final self::I #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
+static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
+static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I /* = core::int */
   return self::I|(x, y);
-static inline-class-member method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
-static inline-class-member method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
+static inline-class-member method I|m(lowered final self::I /* = core::int */ #this, core::String s, [core::int i = #C2]) → void {}
+static inline-class-member method I|get#m(lowered final self::I /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C2]) → void => self::I|m(#this, s, i);
-static inline-class-member method I2|_(dynamic it) → self::I2 {
-  lowered final self::I2 #this = it;
+static inline-class-member method I2|_(dynamic it) → self::I2 /* = core::int */ {
+  lowered final self::I2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method I2|_#_#tearOff(dynamic it) → self::I2
+static inline-class-member method I2|_#_#tearOff(dynamic it) → self::I2 /* = core::int */
   return self::I2|_(it);
-static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
-  lowered final self::I2 #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
+static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 /* = core::int */ {
+  lowered final self::I2 /* = core::int */ #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
+static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2 /* = core::int */
   return self::I2|(x, y: y);
-static inline-class-member method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
-static inline-class-member method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
+static inline-class-member method I2|m(lowered final self::I2 /* = core::int */ #this, core::String s, {core::int i = #C2}) → void {}
+static inline-class-member method I2|get#m(lowered final self::I2 /* = core::int */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C2}) → void => self::I2|m(#this, s, i: i);
 static method main() → dynamic {
   self::expect(42, self::I|(0));
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.weak.modular.expect
index e67c62cdd3d..769ed61b6f4 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.weak.modular.expect
@@ -18,35 +18,35 @@ extension type I2(core::int it) {
   constructor • = self::I2|;
   tearoff • = self::I2|_#new#tearOff;
 }
-static inline-class-member method I|_(dynamic it) → self::I {
-  lowered final self::I #this = it;
+static inline-class-member method I|_(dynamic it) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method I|_#_#tearOff(dynamic it) → self::I
+static inline-class-member method I|_#_#tearOff(dynamic it) → self::I /* = core::int */
   return self::I|_(it);
-static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I {
-  lowered final self::I #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
+static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
+static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I /* = core::int */
   return self::I|(x, y);
-static inline-class-member method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
-static inline-class-member method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
+static inline-class-member method I|m(lowered final self::I /* = core::int */ #this, core::String s, [core::int i = #C2]) → void {}
+static inline-class-member method I|get#m(lowered final self::I /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C2]) → void => self::I|m(#this, s, i);
-static inline-class-member method I2|_(dynamic it) → self::I2 {
-  lowered final self::I2 #this = it;
+static inline-class-member method I2|_(dynamic it) → self::I2 /* = core::int */ {
+  lowered final self::I2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method I2|_#_#tearOff(dynamic it) → self::I2
+static inline-class-member method I2|_#_#tearOff(dynamic it) → self::I2 /* = core::int */
   return self::I2|_(it);
-static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
-  lowered final self::I2 #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
+static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 /* = core::int */ {
+  lowered final self::I2 /* = core::int */ #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
+static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2 /* = core::int */
   return self::I2|(x, y: y);
-static inline-class-member method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
-static inline-class-member method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
+static inline-class-member method I2|m(lowered final self::I2 /* = core::int */ #this, core::String s, {core::int i = #C2}) → void {}
+static inline-class-member method I2|get#m(lowered final self::I2 /* = core::int */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C2}) → void => self::I2|m(#this, s, i: i);
 static method main() → dynamic {
   self::expect(42, self::I|(0));
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.weak.outline.expect
index 393918a9439..f7fcd935a16 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.weak.outline.expect
@@ -18,29 +18,29 @@ extension type I2(core::int it) {
   constructor • = self::I2|;
   tearoff • = self::I2|_#new#tearOff;
 }
-static inline-class-member method I|_(dynamic it) → self::I
+static inline-class-member method I|_(dynamic it) → self::I /* = core::int */
   ;
-static inline-class-member method I|_#_#tearOff(dynamic it) → self::I
+static inline-class-member method I|_#_#tearOff(dynamic it) → self::I /* = core::int */
   return self::I|_(it);
-static inline-class-member method I|(core::int x, [core::int? y = null]) → self::I
+static inline-class-member method I|(core::int x, [core::int? y = null]) → self::I /* = core::int */
   ;
-static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
+static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I /* = core::int */
   return self::I|(x, y);
-static inline-class-member method I|m(lowered final self::I #this, core::String s, [has-declared-initializer core::int i]) → void
+static inline-class-member method I|m(lowered final self::I /* = core::int */ #this, core::String s, [has-declared-initializer core::int i]) → void
   ;
-static inline-class-member method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
+static inline-class-member method I|get#m(lowered final self::I /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i]) → void => self::I|m(#this, s, i);
-static inline-class-member method I2|_(dynamic it) → self::I2
+static inline-class-member method I2|_(dynamic it) → self::I2 /* = core::int */
   ;
-static inline-class-member method I2|_#_#tearOff(dynamic it) → self::I2
+static inline-class-member method I2|_#_#tearOff(dynamic it) → self::I2 /* = core::int */
   return self::I2|_(it);
-static inline-class-member method I2|(core::int x, {core::int? y = null}) → self::I2
+static inline-class-member method I2|(core::int x, {core::int? y = null}) → self::I2 /* = core::int */
   ;
-static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
+static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2 /* = core::int */
   return self::I2|(x, y: y);
-static inline-class-member method I2|m(lowered final self::I2 #this, core::String s, {has-declared-initializer core::int i}) → void
+static inline-class-member method I2|m(lowered final self::I2 /* = core::int */ #this, core::String s, {has-declared-initializer core::int i}) → void
   ;
-static inline-class-member method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
+static inline-class-member method I2|get#m(lowered final self::I2 /* = core::int */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i}) → void => self::I2|m(#this, s, i: i);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.weak.transformed.expect
index e67c62cdd3d..769ed61b6f4 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructor_formal_parameters.dart.weak.transformed.expect
@@ -18,35 +18,35 @@ extension type I2(core::int it) {
   constructor • = self::I2|;
   tearoff • = self::I2|_#new#tearOff;
 }
-static inline-class-member method I|_(dynamic it) → self::I {
-  lowered final self::I #this = it;
+static inline-class-member method I|_(dynamic it) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method I|_#_#tearOff(dynamic it) → self::I
+static inline-class-member method I|_#_#tearOff(dynamic it) → self::I /* = core::int */
   return self::I|_(it);
-static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I {
-  lowered final self::I #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
+static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
+static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I /* = core::int */
   return self::I|(x, y);
-static inline-class-member method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
-static inline-class-member method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
+static inline-class-member method I|m(lowered final self::I /* = core::int */ #this, core::String s, [core::int i = #C2]) → void {}
+static inline-class-member method I|get#m(lowered final self::I /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C2]) → void => self::I|m(#this, s, i);
-static inline-class-member method I2|_(dynamic it) → self::I2 {
-  lowered final self::I2 #this = it;
+static inline-class-member method I2|_(dynamic it) → self::I2 /* = core::int */ {
+  lowered final self::I2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method I2|_#_#tearOff(dynamic it) → self::I2
+static inline-class-member method I2|_#_#tearOff(dynamic it) → self::I2 /* = core::int */
   return self::I2|_(it);
-static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
-  lowered final self::I2 #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
+static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 /* = core::int */ {
+  lowered final self::I2 /* = core::int */ #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
+static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2 /* = core::int */
   return self::I2|(x, y: y);
-static inline-class-member method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
-static inline-class-member method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
+static inline-class-member method I2|m(lowered final self::I2 /* = core::int */ #this, core::String s, {core::int i = #C2}) → void {}
+static inline-class-member method I2|get#m(lowered final self::I2 /* = core::int */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C2}) → void => self::I2|m(#this, s, i: i);
 static method main() → dynamic {
   self::expect(42, self::I|(0));
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.strong.expect
index 9dbccd0d321..ae5e8922f68 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.strong.expect
@@ -10,15 +10,15 @@ extension type Class2(core::int field) {
   constructor • = self::Class2|;
   tearoff • = self::Class2|_#new#tearOff;
 }
-static inline-class-member method Class1|(dynamic field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(dynamic field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(dynamic field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(dynamic field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|(dynamic field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(dynamic field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(dynamic field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(dynamic field) → self::Class2 /* = core::int */
   return self::Class2|(field);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.strong.transformed.expect
index 9dbccd0d321..ae5e8922f68 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.strong.transformed.expect
@@ -10,15 +10,15 @@ extension type Class2(core::int field) {
   constructor • = self::Class2|;
   tearoff • = self::Class2|_#new#tearOff;
 }
-static inline-class-member method Class1|(dynamic field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(dynamic field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(dynamic field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(dynamic field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|(dynamic field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(dynamic field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(dynamic field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(dynamic field) → self::Class2 /* = core::int */
   return self::Class2|(field);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.weak.expect
index 9dbccd0d321..ae5e8922f68 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.weak.expect
@@ -10,15 +10,15 @@ extension type Class2(core::int field) {
   constructor • = self::Class2|;
   tearoff • = self::Class2|_#new#tearOff;
 }
-static inline-class-member method Class1|(dynamic field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(dynamic field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(dynamic field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(dynamic field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|(dynamic field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(dynamic field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(dynamic field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(dynamic field) → self::Class2 /* = core::int */
   return self::Class2|(field);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.weak.modular.expect
index 9dbccd0d321..ae5e8922f68 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.weak.modular.expect
@@ -10,15 +10,15 @@ extension type Class2(core::int field) {
   constructor • = self::Class2|;
   tearoff • = self::Class2|_#new#tearOff;
 }
-static inline-class-member method Class1|(dynamic field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(dynamic field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(dynamic field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(dynamic field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|(dynamic field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(dynamic field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(dynamic field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(dynamic field) → self::Class2 /* = core::int */
   return self::Class2|(field);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.weak.outline.expect
index abc72f86443..6e06252723c 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.weak.outline.expect
@@ -10,11 +10,11 @@ extension type Class2(core::int field) {
   constructor • = self::Class2|;
   tearoff • = self::Class2|_#new#tearOff;
 }
-static inline-class-member method Class1|(dynamic field) → self::Class1
+static inline-class-member method Class1|(dynamic field) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#new#tearOff(dynamic field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(dynamic field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|(dynamic field) → self::Class2
+static inline-class-member method Class2|(dynamic field) → self::Class2 /* = core::int */
   ;
-static inline-class-member method Class2|_#new#tearOff(dynamic field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(dynamic field) → self::Class2 /* = core::int */
   return self::Class2|(field);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.weak.transformed.expect
index 9dbccd0d321..ae5e8922f68 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/constructors.dart.weak.transformed.expect
@@ -10,15 +10,15 @@ extension type Class2(core::int field) {
   constructor • = self::Class2|;
   tearoff • = self::Class2|_#new#tearOff;
 }
-static inline-class-member method Class1|(dynamic field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(dynamic field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(dynamic field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(dynamic field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|(dynamic field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(dynamic field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(dynamic field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(dynamic field) → self::Class2 /* = core::int */
   return self::Class2|(field);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.strong.expect
index 7aeee30689d..cc10b407d29 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.strong.expect
@@ -53,39 +53,39 @@ extension type F(core::int it) {
   constructor • = self::F|;
   tearoff • = self::F|_#new#tearOff;
 }
-static inline-class-member method A|(dynamic it) → self::A {
-  lowered final self::A #this = it;
+static inline-class-member method A|(dynamic it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(dynamic it) → self::A
+static inline-class-member method A|_#new#tearOff(dynamic it) → self::A /* = core::int */
   return self::A|(it);
-static inline-class-member method B|(dynamic it) → self::B {
-  lowered final self::B #this = it;
+static inline-class-member method B|(dynamic it) → self::B /* = core::int */ {
+  lowered final self::B /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff(dynamic it) → self::B
+static inline-class-member method B|_#new#tearOff(dynamic it) → self::B /* = core::int */
   return self::B|(it);
-static inline-class-member method C|(dynamic it) → self::C {
-  lowered final self::C #this = it;
+static inline-class-member method C|(dynamic it) → self::C /* = core::int */ {
+  lowered final self::C /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C|_#new#tearOff(dynamic it) → self::C
+static inline-class-member method C|_#new#tearOff(dynamic it) → self::C /* = core::int */
   return self::C|(it);
-static inline-class-member method D|(dynamic it) → self::D {
-  lowered final self::D #this = it;
+static inline-class-member method D|(dynamic it) → self::D /* = core::int */ {
+  lowered final self::D /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D|_#new#tearOff(dynamic it) → self::D
+static inline-class-member method D|_#new#tearOff(dynamic it) → self::D /* = core::int */
   return self::D|(it);
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = core::int */ {
+  lowered final self::E /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = core::int */
   return self::E|(it);
-static inline-class-member method F|(dynamic it) → self::F {
-  lowered final self::F #this = it;
+static inline-class-member method F|(dynamic it) → self::F /* = core::int */ {
+  lowered final self::F /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method F|_#new#tearOff(dynamic it) → self::F
+static inline-class-member method F|_#new#tearOff(dynamic it) → self::F /* = core::int */
   return self::F|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.strong.transformed.expect
index 7aeee30689d..cc10b407d29 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.strong.transformed.expect
@@ -53,39 +53,39 @@ extension type F(core::int it) {
   constructor • = self::F|;
   tearoff • = self::F|_#new#tearOff;
 }
-static inline-class-member method A|(dynamic it) → self::A {
-  lowered final self::A #this = it;
+static inline-class-member method A|(dynamic it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(dynamic it) → self::A
+static inline-class-member method A|_#new#tearOff(dynamic it) → self::A /* = core::int */
   return self::A|(it);
-static inline-class-member method B|(dynamic it) → self::B {
-  lowered final self::B #this = it;
+static inline-class-member method B|(dynamic it) → self::B /* = core::int */ {
+  lowered final self::B /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff(dynamic it) → self::B
+static inline-class-member method B|_#new#tearOff(dynamic it) → self::B /* = core::int */
   return self::B|(it);
-static inline-class-member method C|(dynamic it) → self::C {
-  lowered final self::C #this = it;
+static inline-class-member method C|(dynamic it) → self::C /* = core::int */ {
+  lowered final self::C /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C|_#new#tearOff(dynamic it) → self::C
+static inline-class-member method C|_#new#tearOff(dynamic it) → self::C /* = core::int */
   return self::C|(it);
-static inline-class-member method D|(dynamic it) → self::D {
-  lowered final self::D #this = it;
+static inline-class-member method D|(dynamic it) → self::D /* = core::int */ {
+  lowered final self::D /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D|_#new#tearOff(dynamic it) → self::D
+static inline-class-member method D|_#new#tearOff(dynamic it) → self::D /* = core::int */
   return self::D|(it);
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = core::int */ {
+  lowered final self::E /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = core::int */
   return self::E|(it);
-static inline-class-member method F|(dynamic it) → self::F {
-  lowered final self::F #this = it;
+static inline-class-member method F|(dynamic it) → self::F /* = core::int */ {
+  lowered final self::F /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method F|_#new#tearOff(dynamic it) → self::F
+static inline-class-member method F|_#new#tearOff(dynamic it) → self::F /* = core::int */
   return self::F|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.weak.expect
index 7aeee30689d..cc10b407d29 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.weak.expect
@@ -53,39 +53,39 @@ extension type F(core::int it) {
   constructor • = self::F|;
   tearoff • = self::F|_#new#tearOff;
 }
-static inline-class-member method A|(dynamic it) → self::A {
-  lowered final self::A #this = it;
+static inline-class-member method A|(dynamic it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(dynamic it) → self::A
+static inline-class-member method A|_#new#tearOff(dynamic it) → self::A /* = core::int */
   return self::A|(it);
-static inline-class-member method B|(dynamic it) → self::B {
-  lowered final self::B #this = it;
+static inline-class-member method B|(dynamic it) → self::B /* = core::int */ {
+  lowered final self::B /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff(dynamic it) → self::B
+static inline-class-member method B|_#new#tearOff(dynamic it) → self::B /* = core::int */
   return self::B|(it);
-static inline-class-member method C|(dynamic it) → self::C {
-  lowered final self::C #this = it;
+static inline-class-member method C|(dynamic it) → self::C /* = core::int */ {
+  lowered final self::C /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C|_#new#tearOff(dynamic it) → self::C
+static inline-class-member method C|_#new#tearOff(dynamic it) → self::C /* = core::int */
   return self::C|(it);
-static inline-class-member method D|(dynamic it) → self::D {
-  lowered final self::D #this = it;
+static inline-class-member method D|(dynamic it) → self::D /* = core::int */ {
+  lowered final self::D /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D|_#new#tearOff(dynamic it) → self::D
+static inline-class-member method D|_#new#tearOff(dynamic it) → self::D /* = core::int */
   return self::D|(it);
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = core::int */ {
+  lowered final self::E /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = core::int */
   return self::E|(it);
-static inline-class-member method F|(dynamic it) → self::F {
-  lowered final self::F #this = it;
+static inline-class-member method F|(dynamic it) → self::F /* = core::int */ {
+  lowered final self::F /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method F|_#new#tearOff(dynamic it) → self::F
+static inline-class-member method F|_#new#tearOff(dynamic it) → self::F /* = core::int */
   return self::F|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.weak.modular.expect
index 7aeee30689d..cc10b407d29 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.weak.modular.expect
@@ -53,39 +53,39 @@ extension type F(core::int it) {
   constructor • = self::F|;
   tearoff • = self::F|_#new#tearOff;
 }
-static inline-class-member method A|(dynamic it) → self::A {
-  lowered final self::A #this = it;
+static inline-class-member method A|(dynamic it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(dynamic it) → self::A
+static inline-class-member method A|_#new#tearOff(dynamic it) → self::A /* = core::int */
   return self::A|(it);
-static inline-class-member method B|(dynamic it) → self::B {
-  lowered final self::B #this = it;
+static inline-class-member method B|(dynamic it) → self::B /* = core::int */ {
+  lowered final self::B /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff(dynamic it) → self::B
+static inline-class-member method B|_#new#tearOff(dynamic it) → self::B /* = core::int */
   return self::B|(it);
-static inline-class-member method C|(dynamic it) → self::C {
-  lowered final self::C #this = it;
+static inline-class-member method C|(dynamic it) → self::C /* = core::int */ {
+  lowered final self::C /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C|_#new#tearOff(dynamic it) → self::C
+static inline-class-member method C|_#new#tearOff(dynamic it) → self::C /* = core::int */
   return self::C|(it);
-static inline-class-member method D|(dynamic it) → self::D {
-  lowered final self::D #this = it;
+static inline-class-member method D|(dynamic it) → self::D /* = core::int */ {
+  lowered final self::D /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D|_#new#tearOff(dynamic it) → self::D
+static inline-class-member method D|_#new#tearOff(dynamic it) → self::D /* = core::int */
   return self::D|(it);
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = core::int */ {
+  lowered final self::E /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = core::int */
   return self::E|(it);
-static inline-class-member method F|(dynamic it) → self::F {
-  lowered final self::F #this = it;
+static inline-class-member method F|(dynamic it) → self::F /* = core::int */ {
+  lowered final self::F /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method F|_#new#tearOff(dynamic it) → self::F
+static inline-class-member method F|_#new#tearOff(dynamic it) → self::F /* = core::int */
   return self::F|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.weak.outline.expect
index c58f1ae4078..d5245a84f56 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.weak.outline.expect
@@ -53,27 +53,27 @@ extension type F(core::int it) {
   constructor • = self::F|;
   tearoff • = self::F|_#new#tearOff;
 }
-static inline-class-member method A|(dynamic it) → self::A
+static inline-class-member method A|(dynamic it) → self::A /* = core::int */
   ;
-static inline-class-member method A|_#new#tearOff(dynamic it) → self::A
+static inline-class-member method A|_#new#tearOff(dynamic it) → self::A /* = core::int */
   return self::A|(it);
-static inline-class-member method B|(dynamic it) → self::B
+static inline-class-member method B|(dynamic it) → self::B /* = core::int */
   ;
-static inline-class-member method B|_#new#tearOff(dynamic it) → self::B
+static inline-class-member method B|_#new#tearOff(dynamic it) → self::B /* = core::int */
   return self::B|(it);
-static inline-class-member method C|(dynamic it) → self::C
+static inline-class-member method C|(dynamic it) → self::C /* = core::int */
   ;
-static inline-class-member method C|_#new#tearOff(dynamic it) → self::C
+static inline-class-member method C|_#new#tearOff(dynamic it) → self::C /* = core::int */
   return self::C|(it);
-static inline-class-member method D|(dynamic it) → self::D
+static inline-class-member method D|(dynamic it) → self::D /* = core::int */
   ;
-static inline-class-member method D|_#new#tearOff(dynamic it) → self::D
+static inline-class-member method D|_#new#tearOff(dynamic it) → self::D /* = core::int */
   return self::D|(it);
-static inline-class-member method E|(dynamic it) → self::E
+static inline-class-member method E|(dynamic it) → self::E /* = core::int */
   ;
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = core::int */
   return self::E|(it);
-static inline-class-member method F|(dynamic it) → self::F
+static inline-class-member method F|(dynamic it) → self::F /* = core::int */
   ;
-static inline-class-member method F|_#new#tearOff(dynamic it) → self::F
+static inline-class-member method F|_#new#tearOff(dynamic it) → self::F /* = core::int */
   return self::F|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.weak.transformed.expect
index 7aeee30689d..cc10b407d29 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/cyclic_extension_types.dart.weak.transformed.expect
@@ -53,39 +53,39 @@ extension type F(core::int it) {
   constructor • = self::F|;
   tearoff • = self::F|_#new#tearOff;
 }
-static inline-class-member method A|(dynamic it) → self::A {
-  lowered final self::A #this = it;
+static inline-class-member method A|(dynamic it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(dynamic it) → self::A
+static inline-class-member method A|_#new#tearOff(dynamic it) → self::A /* = core::int */
   return self::A|(it);
-static inline-class-member method B|(dynamic it) → self::B {
-  lowered final self::B #this = it;
+static inline-class-member method B|(dynamic it) → self::B /* = core::int */ {
+  lowered final self::B /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff(dynamic it) → self::B
+static inline-class-member method B|_#new#tearOff(dynamic it) → self::B /* = core::int */
   return self::B|(it);
-static inline-class-member method C|(dynamic it) → self::C {
-  lowered final self::C #this = it;
+static inline-class-member method C|(dynamic it) → self::C /* = core::int */ {
+  lowered final self::C /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C|_#new#tearOff(dynamic it) → self::C
+static inline-class-member method C|_#new#tearOff(dynamic it) → self::C /* = core::int */
   return self::C|(it);
-static inline-class-member method D|(dynamic it) → self::D {
-  lowered final self::D #this = it;
+static inline-class-member method D|(dynamic it) → self::D /* = core::int */ {
+  lowered final self::D /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D|_#new#tearOff(dynamic it) → self::D
+static inline-class-member method D|_#new#tearOff(dynamic it) → self::D /* = core::int */
   return self::D|(it);
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = core::int */ {
+  lowered final self::E /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = core::int */
   return self::E|(it);
-static inline-class-member method F|(dynamic it) → self::F {
-  lowered final self::F #this = it;
+static inline-class-member method F|(dynamic it) → self::F /* = core::int */ {
+  lowered final self::F /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method F|_#new#tearOff(dynamic it) → self::F
+static inline-class-member method F|_#new#tearOff(dynamic it) → self::F /* = core::int */
   return self::F|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.strong.expect
index 9d381d2fe93..f5a49655b5c 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.strong.expect
@@ -194,23 +194,23 @@ library;
 import self as self;
 import "dart:core" as core;
 
-typedef Alias9 = self::E9;
-typedef Alias10<unrelated T extends core::Object? = dynamic> = self::E10<T%>;
-typedef Alias11 = () → self::E11;
-typedef Alias12 = (self::E12) → void;
-typedef Alias13 = <T extends self::E13 = dynamic>() → void;
+typedef Alias9 = self::E9 /* = invalid-type */;
+typedef Alias10<unrelated T extends core::Object? = dynamic> = self::E10<T%> /* = invalid-type */;
+typedef Alias11 = () → self::E11 /* = invalid-type */;
+typedef Alias12 = (self::E12 /* = invalid-type */) → void;
+typedef Alias13 = <T extends self::E13 /* = invalid-type */ = dynamic>() → void;
 typedef Alias14<unrelated T extends core::Object? = dynamic> = core::int;
 typedef Alias15<T extends core::Object? = dynamic> = core::List<T%>;
-typedef Alias16a<unrelated T extends core::Object? = dynamic> = core::List<self::E16b>;
-typedef Alias16b<unrelated T extends core::Object? = dynamic> = core::List<self::E16a>;
-typedef Alias18a<unrelated T extends core::Object? = dynamic> = (self::E18) → void;
+typedef Alias16a<unrelated T extends core::Object? = dynamic> = core::List<self::E16b /* = invalid-type */>;
+typedef Alias16b<unrelated T extends core::Object? = dynamic> = core::List<self::E16a /* = invalid-type */>;
+typedef Alias18a<unrelated T extends core::Object? = dynamic> = (self::E18 /* = invalid-type */) → void;
 typedef Alias18b<contravariant T extends core::Object? = dynamic> = (T%) → void;
 typedef Alias20 = invalid-type;
 typedef Alias21 = core::int;
 typedef Alias22a = invalid-type;
 typedef Alias22b = core::int;
-typedef Alias23<T extends self::E23> = core::List<T>;
-typedef Alias24<T extends self::E24<T> = self::E24<dynamic>> = core::List<T>;
+typedef Alias23<T extends self::E23 /* = invalid-type */> = core::List<T>;
+typedef Alias24<T extends self::E24<T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */> = core::List<T>;
 extension type E1(invalid-type it) {
   constructor • = self::E1|;
   tearoff • = self::E1|_#new#tearOff;
@@ -303,7 +303,7 @@ extension type E18(invalid-type it) {
   constructor • = self::E18|;
   tearoff • = self::E18|_#new#tearOff;
 }
-extension type E19a((self::E19b, self::E19b) it) {
+extension type E19a((self::E19b /* = core::int */, self::E19b /* = core::int */) it) {
   constructor • = self::E19a|;
   tearoff • = self::E19a|_#new#tearOff;
 }
@@ -331,235 +331,235 @@ extension type E24<T extends core::Object? = dynamic>(invalid-type it) {
   constructor • = self::E24|;
   tearoff • = self::E24|_#new#tearOff;
 }
-static inline-class-member method E1|(dynamic it) → self::E1 {
-  lowered final self::E1 #this = it;
+static inline-class-member method E1|(dynamic it) → self::E1 /* = invalid-type */ {
+  lowered final self::E1 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E1|_#new#tearOff(dynamic it) → self::E1
+static inline-class-member method E1|_#new#tearOff(dynamic it) → self::E1 /* = invalid-type */
   return self::E1|(it);
-static inline-class-member method E2a|(dynamic it) → self::E2a {
-  lowered final self::E2a #this = it;
+static inline-class-member method E2a|(dynamic it) → self::E2a /* = invalid-type */ {
+  lowered final self::E2a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E2a|_#new#tearOff(dynamic it) → self::E2a
+static inline-class-member method E2a|_#new#tearOff(dynamic it) → self::E2a /* = invalid-type */
   return self::E2a|(it);
-static inline-class-member method E2b|(dynamic it) → self::E2b {
-  lowered final self::E2b #this = it;
+static inline-class-member method E2b|(dynamic it) → self::E2b /* = invalid-type */ {
+  lowered final self::E2b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E2b|_#new#tearOff(dynamic it) → self::E2b
+static inline-class-member method E2b|_#new#tearOff(dynamic it) → self::E2b /* = invalid-type */
   return self::E2b|(it);
-static inline-class-member method E3a|(dynamic it) → self::E3a {
-  lowered final self::E3a #this = it;
+static inline-class-member method E3a|(dynamic it) → self::E3a /* = invalid-type */ {
+  lowered final self::E3a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E3a|_#new#tearOff(dynamic it) → self::E3a
+static inline-class-member method E3a|_#new#tearOff(dynamic it) → self::E3a /* = invalid-type */
   return self::E3a|(it);
-static inline-class-member method E3b|(dynamic it) → self::E3b {
-  lowered final self::E3b #this = it;
+static inline-class-member method E3b|(dynamic it) → self::E3b /* = invalid-type */ {
+  lowered final self::E3b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E3b|_#new#tearOff(dynamic it) → self::E3b
+static inline-class-member method E3b|_#new#tearOff(dynamic it) → self::E3b /* = invalid-type */
   return self::E3b|(it);
-static inline-class-member method E3c|(dynamic it) → self::E3c {
-  lowered final self::E3c #this = it;
+static inline-class-member method E3c|(dynamic it) → self::E3c /* = invalid-type */ {
+  lowered final self::E3c /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E3c|_#new#tearOff(dynamic it) → self::E3c
+static inline-class-member method E3c|_#new#tearOff(dynamic it) → self::E3c /* = invalid-type */
   return self::E3c|(it);
-static inline-class-member method E4|(dynamic it) → self::E4 {
-  lowered final self::E4 #this = it;
+static inline-class-member method E4|(dynamic it) → self::E4 /* = invalid-type */ {
+  lowered final self::E4 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E4|_#new#tearOff(dynamic it) → self::E4
+static inline-class-member method E4|_#new#tearOff(dynamic it) → self::E4 /* = invalid-type */
   return self::E4|(it);
-static inline-class-member method E5|(dynamic it) → self::E5 {
-  lowered final self::E5 #this = it;
+static inline-class-member method E5|(dynamic it) → self::E5 /* = invalid-type */ {
+  lowered final self::E5 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E5|_#new#tearOff(dynamic it) → self::E5
+static inline-class-member method E5|_#new#tearOff(dynamic it) → self::E5 /* = invalid-type */
   return self::E5|(it);
-static inline-class-member method E6|(dynamic it) → self::E6 {
-  lowered final self::E6 #this = it;
+static inline-class-member method E6|(dynamic it) → self::E6 /* = invalid-type */ {
+  lowered final self::E6 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E6|_#new#tearOff(dynamic it) → self::E6
+static inline-class-member method E6|_#new#tearOff(dynamic it) → self::E6 /* = invalid-type */
   return self::E6|(it);
-static inline-class-member method E7|_#new#tearOff(dynamic it) → self::E7
+static inline-class-member method E7|_#new#tearOff(dynamic it) → self::E7 /* = invalid-type */
   return self::E7|(it);
-static inline-class-member method E7|(dynamic it) → self::E7 {
-  lowered final self::E7 #this = it;
+static inline-class-member method E7|(dynamic it) → self::E7 /* = invalid-type */ {
+  lowered final self::E7 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E8|<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|::T%> {
-  lowered final self::E8<self::E8|::T%> #this = it;
+static inline-class-member method E8|<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|::T%> /* = invalid-type */ {
+  lowered final self::E8<self::E8|::T%> /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E8|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|_#new#tearOff::T%>
+static inline-class-member method E8|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|_#new#tearOff::T%> /* = invalid-type */
   return self::E8|<self::E8|_#new#tearOff::T%>(it);
-static inline-class-member method E9|(dynamic it) → self::E9 {
-  lowered final self::E9 #this = it;
+static inline-class-member method E9|(dynamic it) → self::E9 /* = invalid-type */ {
+  lowered final self::E9 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E9|_#new#tearOff(dynamic it) → self::E9
+static inline-class-member method E9|_#new#tearOff(dynamic it) → self::E9 /* = invalid-type */
   return self::E9|(it);
-static inline-class-member method E10|<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|::T%> {
-  lowered final self::E10<self::E10|::T%> #this = it;
+static inline-class-member method E10|<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|::T%> /* = invalid-type */ {
+  lowered final self::E10<self::E10|::T%> /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E10|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|_#new#tearOff::T%>
+static inline-class-member method E10|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|_#new#tearOff::T%> /* = invalid-type */
   return self::E10|<self::E10|_#new#tearOff::T%>(it);
-static inline-class-member method E11|(dynamic it) → self::E11 {
-  lowered final self::E11 #this = it;
+static inline-class-member method E11|(dynamic it) → self::E11 /* = invalid-type */ {
+  lowered final self::E11 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E11|_#new#tearOff(dynamic it) → self::E11
+static inline-class-member method E11|_#new#tearOff(dynamic it) → self::E11 /* = invalid-type */
   return self::E11|(it);
-static inline-class-member method E12|(dynamic it) → self::E12 {
-  lowered final self::E12 #this = it;
+static inline-class-member method E12|(dynamic it) → self::E12 /* = invalid-type */ {
+  lowered final self::E12 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E12|_#new#tearOff(dynamic it) → self::E12
+static inline-class-member method E12|_#new#tearOff(dynamic it) → self::E12 /* = invalid-type */
   return self::E12|(it);
-static inline-class-member method E13|(dynamic it) → self::E13 {
-  lowered final self::E13 #this = it;
+static inline-class-member method E13|(dynamic it) → self::E13 /* = invalid-type */ {
+  lowered final self::E13 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E13|_#new#tearOff(dynamic it) → self::E13
+static inline-class-member method E13|_#new#tearOff(dynamic it) → self::E13 /* = invalid-type */
   return self::E13|(it);
-static inline-class-member method E14|(dynamic it) → self::E14 {
-  lowered final self::E14 #this = it;
+static inline-class-member method E14|(dynamic it) → self::E14 /* = core::int */ {
+  lowered final self::E14 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E14|_#new#tearOff(dynamic it) → self::E14
+static inline-class-member method E14|_#new#tearOff(dynamic it) → self::E14 /* = core::int */
   return self::E14|(it);
-static inline-class-member method E15a|(dynamic it) → self::E15a {
-  lowered final self::E15a #this = it;
+static inline-class-member method E15a|(dynamic it) → self::E15a /* = invalid-type */ {
+  lowered final self::E15a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E15a|_#new#tearOff(dynamic it) → self::E15a
+static inline-class-member method E15a|_#new#tearOff(dynamic it) → self::E15a /* = invalid-type */
   return self::E15a|(it);
-static inline-class-member method E15b|(dynamic it) → self::E15b {
-  lowered final self::E15b #this = it;
+static inline-class-member method E15b|(dynamic it) → self::E15b /* = invalid-type */ {
+  lowered final self::E15b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E15b|_#new#tearOff(dynamic it) → self::E15b
+static inline-class-member method E15b|_#new#tearOff(dynamic it) → self::E15b /* = invalid-type */
   return self::E15b|(it);
-static inline-class-member method E16a|(dynamic it) → self::E16a {
-  lowered final self::E16a #this = it;
+static inline-class-member method E16a|(dynamic it) → self::E16a /* = invalid-type */ {
+  lowered final self::E16a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E16a|_#new#tearOff(dynamic it) → self::E16a
+static inline-class-member method E16a|_#new#tearOff(dynamic it) → self::E16a /* = invalid-type */
   return self::E16a|(it);
-static inline-class-member method E16b|(dynamic it) → self::E16b {
-  lowered final self::E16b #this = it;
+static inline-class-member method E16b|(dynamic it) → self::E16b /* = invalid-type */ {
+  lowered final self::E16b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E16b|_#new#tearOff(dynamic it) → self::E16b
+static inline-class-member method E16b|_#new#tearOff(dynamic it) → self::E16b /* = invalid-type */
   return self::E16b|(it);
-static inline-class-member method E17|(dynamic it) → self::E17 {
-  lowered final self::E17 #this = it;
+static inline-class-member method E17|(dynamic it) → self::E17 /* = invalid-type */ {
+  lowered final self::E17 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E17|_#new#tearOff(dynamic it) → self::E17
+static inline-class-member method E17|_#new#tearOff(dynamic it) → self::E17 /* = invalid-type */
   return self::E17|(it);
-static inline-class-member method E18|(dynamic it) → self::E18 {
-  lowered final self::E18 #this = it;
+static inline-class-member method E18|(dynamic it) → self::E18 /* = invalid-type */ {
+  lowered final self::E18 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E18|_#new#tearOff(dynamic it) → self::E18
+static inline-class-member method E18|_#new#tearOff(dynamic it) → self::E18 /* = invalid-type */
   return self::E18|(it);
-static inline-class-member method E19a|(dynamic it) → self::E19a {
-  lowered final self::E19a #this = it;
+static inline-class-member method E19a|(dynamic it) → self::E19a /* =(self::E19b /* = core::int */, self::E19b /* = core::int */) */ {
+  lowered final self::E19a /* =(self::E19b /* = core::int */, self::E19b /* = core::int */) */ #this = it;
   return #this;
 }
-static inline-class-member method E19a|_#new#tearOff(dynamic it) → self::E19a
+static inline-class-member method E19a|_#new#tearOff(dynamic it) → self::E19a /* =(self::E19b /* = core::int */, self::E19b /* = core::int */) */
   return self::E19a|(it);
-static inline-class-member method E19b|(dynamic it) → self::E19b {
-  lowered final self::E19b #this = it;
+static inline-class-member method E19b|(dynamic it) → self::E19b /* = core::int */ {
+  lowered final self::E19b /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E19b|_#new#tearOff(dynamic it) → self::E19b
+static inline-class-member method E19b|_#new#tearOff(dynamic it) → self::E19b /* = core::int */
   return self::E19b|(it);
-static inline-class-member method E20|(dynamic it) → self::E20 {
-  lowered final self::E20 #this = it;
+static inline-class-member method E20|(dynamic it) → self::E20 /* = invalid-type */ {
+  lowered final self::E20 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E20|_#new#tearOff(dynamic it) → self::E20
+static inline-class-member method E20|_#new#tearOff(dynamic it) → self::E20 /* = invalid-type */
   return self::E20|(it);
-static inline-class-member method E21|(dynamic it) → self::E21 {
-  lowered final self::E21 #this = it;
+static inline-class-member method E21|(dynamic it) → self::E21 /* = invalid-type */ {
+  lowered final self::E21 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E21|_#new#tearOff(dynamic it) → self::E21
+static inline-class-member method E21|_#new#tearOff(dynamic it) → self::E21 /* = invalid-type */
   return self::E21|(it);
-static inline-class-member method E22|(dynamic it) → self::E22 {
-  lowered final self::E22 #this = it;
+static inline-class-member method E22|(dynamic it) → self::E22 /* = invalid-type */ {
+  lowered final self::E22 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E22|_#new#tearOff(dynamic it) → self::E22
+static inline-class-member method E22|_#new#tearOff(dynamic it) → self::E22 /* = invalid-type */
   return self::E22|(it);
-static inline-class-member method E23|(dynamic it) → self::E23 {
-  lowered final self::E23 #this = it;
+static inline-class-member method E23|(dynamic it) → self::E23 /* = invalid-type */ {
+  lowered final self::E23 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E23|_#new#tearOff(dynamic it) → self::E23
+static inline-class-member method E23|_#new#tearOff(dynamic it) → self::E23 /* = invalid-type */
   return self::E23|(it);
-static inline-class-member method E24|<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|::T%> {
-  lowered final self::E24<self::E24|::T%> #this = it;
+static inline-class-member method E24|<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|::T%> /* = invalid-type */ {
+  lowered final self::E24<self::E24|::T%> /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E24|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|_#new#tearOff::T%>
+static inline-class-member method E24|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|_#new#tearOff::T%> /* = invalid-type */
   return self::E24|<self::E24|_#new#tearOff::T%>(it);
 static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/integers_patch.dart */ _#Alias14#fromEnvironment#tearOff<unrelated T extends core::Object? = dynamic>(core::String name, {core::int defaultValue = #C1}) → core::int
   return core::int::fromEnvironment(name, defaultValue: defaultValue);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16b fill, {core::bool growable = #C2}) → core::List<self::E16b>
-  return core::List::filled<self::E16b>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16b>
-  return core::List::empty<self::E16b>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16b>
-  return core::List::from<self::E16b>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16b> elements, {core::bool growable = #C3}) → core::List<self::E16b>
-  return core::List::of<self::E16b>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16b generator, {core::bool growable = #C3}) → core::List<self::E16b>
-  return core::List::generate<self::E16b>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16b>
-  return core::List::unmodifiable<self::E16b>(elements);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16a fill, {core::bool growable = #C2}) → core::List<self::E16a>
-  return core::List::filled<self::E16a>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16a>
-  return core::List::empty<self::E16a>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16a>
-  return core::List::from<self::E16a>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16a> elements, {core::bool growable = #C3}) → core::List<self::E16a>
-  return core::List::of<self::E16a>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16a generator, {core::bool growable = #C3}) → core::List<self::E16a>
-  return core::List::generate<self::E16a>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16a>
-  return core::List::unmodifiable<self::E16a>(elements);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#filled#tearOff<T extends self::E23>(core::int length, self::_#Alias23#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias23#filled#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16b /* = invalid-type */ fill, {core::bool growable = #C2}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::filled<self::E16b /* = invalid-type */>(length, fill, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::empty<self::E16b /* = invalid-type */>(growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::from<self::E16b /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16b /* = invalid-type */> elements, {core::bool growable = #C3}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::of<self::E16b /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16b /* = invalid-type */ generator, {core::bool growable = #C3}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::generate<self::E16b /* = invalid-type */>(length, generator, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16b /* = invalid-type */>
+  return core::List::unmodifiable<self::E16b /* = invalid-type */>(elements);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16a /* = invalid-type */ fill, {core::bool growable = #C2}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::filled<self::E16a /* = invalid-type */>(length, fill, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::empty<self::E16a /* = invalid-type */>(growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::from<self::E16a /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16a /* = invalid-type */> elements, {core::bool growable = #C3}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::of<self::E16a /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16a /* = invalid-type */ generator, {core::bool growable = #C3}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::generate<self::E16a /* = invalid-type */>(length, generator, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16a /* = invalid-type */>
+  return core::List::unmodifiable<self::E16a /* = invalid-type */>(elements);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#filled#tearOff<T extends self::E23 /* = invalid-type */>(core::int length, self::_#Alias23#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias23#filled#tearOff::T>
   return core::List::filled<self::_#Alias23#filled#tearOff::T>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#empty#tearOff<T extends self::E23>({core::bool growable = #C2}) → core::List<self::_#Alias23#empty#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#empty#tearOff<T extends self::E23 /* = invalid-type */>({core::bool growable = #C2}) → core::List<self::_#Alias23#empty#tearOff::T>
   return core::List::empty<self::_#Alias23#empty#tearOff::T>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#from#tearOff<T extends self::E23>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#from#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#from#tearOff<T extends self::E23 /* = invalid-type */>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#from#tearOff::T>
   return core::List::from<self::_#Alias23#from#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#of#tearOff<T extends self::E23>(core::Iterable<self::_#Alias23#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#of#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#of#tearOff<T extends self::E23 /* = invalid-type */>(core::Iterable<self::_#Alias23#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#of#tearOff::T>
   return core::List::of<self::_#Alias23#of#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#generate#tearOff<T extends self::E23>(core::int length, (core::int) → self::_#Alias23#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias23#generate#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#generate#tearOff<T extends self::E23 /* = invalid-type */>(core::int length, (core::int) → self::_#Alias23#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias23#generate#tearOff::T>
   return core::List::generate<self::_#Alias23#generate#tearOff::T>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#unmodifiable#tearOff<T extends self::E23>(core::Iterable<dynamic> elements) → core::List<self::_#Alias23#unmodifiable#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#unmodifiable#tearOff<T extends self::E23 /* = invalid-type */>(core::Iterable<dynamic> elements) → core::List<self::_#Alias23#unmodifiable#tearOff::T>
   return core::List::unmodifiable<self::_#Alias23#unmodifiable#tearOff::T>(elements);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#filled#tearOff<T extends self::E24<self::_#Alias24#filled#tearOff::T> = self::E24<dynamic>>(core::int length, self::_#Alias24#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias24#filled#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#filled#tearOff<T extends self::E24<self::_#Alias24#filled#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::int length, self::_#Alias24#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias24#filled#tearOff::T>
   return core::List::filled<self::_#Alias24#filled#tearOff::T>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#empty#tearOff<T extends self::E24<self::_#Alias24#empty#tearOff::T> = self::E24<dynamic>>({core::bool growable = #C2}) → core::List<self::_#Alias24#empty#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#empty#tearOff<T extends self::E24<self::_#Alias24#empty#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>({core::bool growable = #C2}) → core::List<self::_#Alias24#empty#tearOff::T>
   return core::List::empty<self::_#Alias24#empty#tearOff::T>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#from#tearOff<T extends self::E24<self::_#Alias24#from#tearOff::T> = self::E24<dynamic>>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#from#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#from#tearOff<T extends self::E24<self::_#Alias24#from#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#from#tearOff::T>
   return core::List::from<self::_#Alias24#from#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#of#tearOff<T extends self::E24<self::_#Alias24#of#tearOff::T> = self::E24<dynamic>>(core::Iterable<self::_#Alias24#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#of#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#of#tearOff<T extends self::E24<self::_#Alias24#of#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::Iterable<self::_#Alias24#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#of#tearOff::T>
   return core::List::of<self::_#Alias24#of#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#generate#tearOff<T extends self::E24<self::_#Alias24#generate#tearOff::T> = self::E24<dynamic>>(core::int length, (core::int) → self::_#Alias24#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias24#generate#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#generate#tearOff<T extends self::E24<self::_#Alias24#generate#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::int length, (core::int) → self::_#Alias24#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias24#generate#tearOff::T>
   return core::List::generate<self::_#Alias24#generate#tearOff::T>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#unmodifiable#tearOff<T extends self::E24<self::_#Alias24#unmodifiable#tearOff::T> = self::E24<dynamic>>(core::Iterable<dynamic> elements) → core::List<self::_#Alias24#unmodifiable#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#unmodifiable#tearOff<T extends self::E24<self::_#Alias24#unmodifiable#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::Iterable<dynamic> elements) → core::List<self::_#Alias24#unmodifiable#tearOff::T>
   return core::List::unmodifiable<self::_#Alias24#unmodifiable#tearOff::T>(elements);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.strong.transformed.expect
index 9d381d2fe93..f5a49655b5c 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.strong.transformed.expect
@@ -194,23 +194,23 @@ library;
 import self as self;
 import "dart:core" as core;
 
-typedef Alias9 = self::E9;
-typedef Alias10<unrelated T extends core::Object? = dynamic> = self::E10<T%>;
-typedef Alias11 = () → self::E11;
-typedef Alias12 = (self::E12) → void;
-typedef Alias13 = <T extends self::E13 = dynamic>() → void;
+typedef Alias9 = self::E9 /* = invalid-type */;
+typedef Alias10<unrelated T extends core::Object? = dynamic> = self::E10<T%> /* = invalid-type */;
+typedef Alias11 = () → self::E11 /* = invalid-type */;
+typedef Alias12 = (self::E12 /* = invalid-type */) → void;
+typedef Alias13 = <T extends self::E13 /* = invalid-type */ = dynamic>() → void;
 typedef Alias14<unrelated T extends core::Object? = dynamic> = core::int;
 typedef Alias15<T extends core::Object? = dynamic> = core::List<T%>;
-typedef Alias16a<unrelated T extends core::Object? = dynamic> = core::List<self::E16b>;
-typedef Alias16b<unrelated T extends core::Object? = dynamic> = core::List<self::E16a>;
-typedef Alias18a<unrelated T extends core::Object? = dynamic> = (self::E18) → void;
+typedef Alias16a<unrelated T extends core::Object? = dynamic> = core::List<self::E16b /* = invalid-type */>;
+typedef Alias16b<unrelated T extends core::Object? = dynamic> = core::List<self::E16a /* = invalid-type */>;
+typedef Alias18a<unrelated T extends core::Object? = dynamic> = (self::E18 /* = invalid-type */) → void;
 typedef Alias18b<contravariant T extends core::Object? = dynamic> = (T%) → void;
 typedef Alias20 = invalid-type;
 typedef Alias21 = core::int;
 typedef Alias22a = invalid-type;
 typedef Alias22b = core::int;
-typedef Alias23<T extends self::E23> = core::List<T>;
-typedef Alias24<T extends self::E24<T> = self::E24<dynamic>> = core::List<T>;
+typedef Alias23<T extends self::E23 /* = invalid-type */> = core::List<T>;
+typedef Alias24<T extends self::E24<T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */> = core::List<T>;
 extension type E1(invalid-type it) {
   constructor • = self::E1|;
   tearoff • = self::E1|_#new#tearOff;
@@ -303,7 +303,7 @@ extension type E18(invalid-type it) {
   constructor • = self::E18|;
   tearoff • = self::E18|_#new#tearOff;
 }
-extension type E19a((self::E19b, self::E19b) it) {
+extension type E19a((self::E19b /* = core::int */, self::E19b /* = core::int */) it) {
   constructor • = self::E19a|;
   tearoff • = self::E19a|_#new#tearOff;
 }
@@ -331,235 +331,235 @@ extension type E24<T extends core::Object? = dynamic>(invalid-type it) {
   constructor • = self::E24|;
   tearoff • = self::E24|_#new#tearOff;
 }
-static inline-class-member method E1|(dynamic it) → self::E1 {
-  lowered final self::E1 #this = it;
+static inline-class-member method E1|(dynamic it) → self::E1 /* = invalid-type */ {
+  lowered final self::E1 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E1|_#new#tearOff(dynamic it) → self::E1
+static inline-class-member method E1|_#new#tearOff(dynamic it) → self::E1 /* = invalid-type */
   return self::E1|(it);
-static inline-class-member method E2a|(dynamic it) → self::E2a {
-  lowered final self::E2a #this = it;
+static inline-class-member method E2a|(dynamic it) → self::E2a /* = invalid-type */ {
+  lowered final self::E2a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E2a|_#new#tearOff(dynamic it) → self::E2a
+static inline-class-member method E2a|_#new#tearOff(dynamic it) → self::E2a /* = invalid-type */
   return self::E2a|(it);
-static inline-class-member method E2b|(dynamic it) → self::E2b {
-  lowered final self::E2b #this = it;
+static inline-class-member method E2b|(dynamic it) → self::E2b /* = invalid-type */ {
+  lowered final self::E2b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E2b|_#new#tearOff(dynamic it) → self::E2b
+static inline-class-member method E2b|_#new#tearOff(dynamic it) → self::E2b /* = invalid-type */
   return self::E2b|(it);
-static inline-class-member method E3a|(dynamic it) → self::E3a {
-  lowered final self::E3a #this = it;
+static inline-class-member method E3a|(dynamic it) → self::E3a /* = invalid-type */ {
+  lowered final self::E3a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E3a|_#new#tearOff(dynamic it) → self::E3a
+static inline-class-member method E3a|_#new#tearOff(dynamic it) → self::E3a /* = invalid-type */
   return self::E3a|(it);
-static inline-class-member method E3b|(dynamic it) → self::E3b {
-  lowered final self::E3b #this = it;
+static inline-class-member method E3b|(dynamic it) → self::E3b /* = invalid-type */ {
+  lowered final self::E3b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E3b|_#new#tearOff(dynamic it) → self::E3b
+static inline-class-member method E3b|_#new#tearOff(dynamic it) → self::E3b /* = invalid-type */
   return self::E3b|(it);
-static inline-class-member method E3c|(dynamic it) → self::E3c {
-  lowered final self::E3c #this = it;
+static inline-class-member method E3c|(dynamic it) → self::E3c /* = invalid-type */ {
+  lowered final self::E3c /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E3c|_#new#tearOff(dynamic it) → self::E3c
+static inline-class-member method E3c|_#new#tearOff(dynamic it) → self::E3c /* = invalid-type */
   return self::E3c|(it);
-static inline-class-member method E4|(dynamic it) → self::E4 {
-  lowered final self::E4 #this = it;
+static inline-class-member method E4|(dynamic it) → self::E4 /* = invalid-type */ {
+  lowered final self::E4 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E4|_#new#tearOff(dynamic it) → self::E4
+static inline-class-member method E4|_#new#tearOff(dynamic it) → self::E4 /* = invalid-type */
   return self::E4|(it);
-static inline-class-member method E5|(dynamic it) → self::E5 {
-  lowered final self::E5 #this = it;
+static inline-class-member method E5|(dynamic it) → self::E5 /* = invalid-type */ {
+  lowered final self::E5 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E5|_#new#tearOff(dynamic it) → self::E5
+static inline-class-member method E5|_#new#tearOff(dynamic it) → self::E5 /* = invalid-type */
   return self::E5|(it);
-static inline-class-member method E6|(dynamic it) → self::E6 {
-  lowered final self::E6 #this = it;
+static inline-class-member method E6|(dynamic it) → self::E6 /* = invalid-type */ {
+  lowered final self::E6 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E6|_#new#tearOff(dynamic it) → self::E6
+static inline-class-member method E6|_#new#tearOff(dynamic it) → self::E6 /* = invalid-type */
   return self::E6|(it);
-static inline-class-member method E7|_#new#tearOff(dynamic it) → self::E7
+static inline-class-member method E7|_#new#tearOff(dynamic it) → self::E7 /* = invalid-type */
   return self::E7|(it);
-static inline-class-member method E7|(dynamic it) → self::E7 {
-  lowered final self::E7 #this = it;
+static inline-class-member method E7|(dynamic it) → self::E7 /* = invalid-type */ {
+  lowered final self::E7 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E8|<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|::T%> {
-  lowered final self::E8<self::E8|::T%> #this = it;
+static inline-class-member method E8|<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|::T%> /* = invalid-type */ {
+  lowered final self::E8<self::E8|::T%> /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E8|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|_#new#tearOff::T%>
+static inline-class-member method E8|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|_#new#tearOff::T%> /* = invalid-type */
   return self::E8|<self::E8|_#new#tearOff::T%>(it);
-static inline-class-member method E9|(dynamic it) → self::E9 {
-  lowered final self::E9 #this = it;
+static inline-class-member method E9|(dynamic it) → self::E9 /* = invalid-type */ {
+  lowered final self::E9 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E9|_#new#tearOff(dynamic it) → self::E9
+static inline-class-member method E9|_#new#tearOff(dynamic it) → self::E9 /* = invalid-type */
   return self::E9|(it);
-static inline-class-member method E10|<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|::T%> {
-  lowered final self::E10<self::E10|::T%> #this = it;
+static inline-class-member method E10|<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|::T%> /* = invalid-type */ {
+  lowered final self::E10<self::E10|::T%> /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E10|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|_#new#tearOff::T%>
+static inline-class-member method E10|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|_#new#tearOff::T%> /* = invalid-type */
   return self::E10|<self::E10|_#new#tearOff::T%>(it);
-static inline-class-member method E11|(dynamic it) → self::E11 {
-  lowered final self::E11 #this = it;
+static inline-class-member method E11|(dynamic it) → self::E11 /* = invalid-type */ {
+  lowered final self::E11 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E11|_#new#tearOff(dynamic it) → self::E11
+static inline-class-member method E11|_#new#tearOff(dynamic it) → self::E11 /* = invalid-type */
   return self::E11|(it);
-static inline-class-member method E12|(dynamic it) → self::E12 {
-  lowered final self::E12 #this = it;
+static inline-class-member method E12|(dynamic it) → self::E12 /* = invalid-type */ {
+  lowered final self::E12 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E12|_#new#tearOff(dynamic it) → self::E12
+static inline-class-member method E12|_#new#tearOff(dynamic it) → self::E12 /* = invalid-type */
   return self::E12|(it);
-static inline-class-member method E13|(dynamic it) → self::E13 {
-  lowered final self::E13 #this = it;
+static inline-class-member method E13|(dynamic it) → self::E13 /* = invalid-type */ {
+  lowered final self::E13 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E13|_#new#tearOff(dynamic it) → self::E13
+static inline-class-member method E13|_#new#tearOff(dynamic it) → self::E13 /* = invalid-type */
   return self::E13|(it);
-static inline-class-member method E14|(dynamic it) → self::E14 {
-  lowered final self::E14 #this = it;
+static inline-class-member method E14|(dynamic it) → self::E14 /* = core::int */ {
+  lowered final self::E14 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E14|_#new#tearOff(dynamic it) → self::E14
+static inline-class-member method E14|_#new#tearOff(dynamic it) → self::E14 /* = core::int */
   return self::E14|(it);
-static inline-class-member method E15a|(dynamic it) → self::E15a {
-  lowered final self::E15a #this = it;
+static inline-class-member method E15a|(dynamic it) → self::E15a /* = invalid-type */ {
+  lowered final self::E15a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E15a|_#new#tearOff(dynamic it) → self::E15a
+static inline-class-member method E15a|_#new#tearOff(dynamic it) → self::E15a /* = invalid-type */
   return self::E15a|(it);
-static inline-class-member method E15b|(dynamic it) → self::E15b {
-  lowered final self::E15b #this = it;
+static inline-class-member method E15b|(dynamic it) → self::E15b /* = invalid-type */ {
+  lowered final self::E15b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E15b|_#new#tearOff(dynamic it) → self::E15b
+static inline-class-member method E15b|_#new#tearOff(dynamic it) → self::E15b /* = invalid-type */
   return self::E15b|(it);
-static inline-class-member method E16a|(dynamic it) → self::E16a {
-  lowered final self::E16a #this = it;
+static inline-class-member method E16a|(dynamic it) → self::E16a /* = invalid-type */ {
+  lowered final self::E16a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E16a|_#new#tearOff(dynamic it) → self::E16a
+static inline-class-member method E16a|_#new#tearOff(dynamic it) → self::E16a /* = invalid-type */
   return self::E16a|(it);
-static inline-class-member method E16b|(dynamic it) → self::E16b {
-  lowered final self::E16b #this = it;
+static inline-class-member method E16b|(dynamic it) → self::E16b /* = invalid-type */ {
+  lowered final self::E16b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E16b|_#new#tearOff(dynamic it) → self::E16b
+static inline-class-member method E16b|_#new#tearOff(dynamic it) → self::E16b /* = invalid-type */
   return self::E16b|(it);
-static inline-class-member method E17|(dynamic it) → self::E17 {
-  lowered final self::E17 #this = it;
+static inline-class-member method E17|(dynamic it) → self::E17 /* = invalid-type */ {
+  lowered final self::E17 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E17|_#new#tearOff(dynamic it) → self::E17
+static inline-class-member method E17|_#new#tearOff(dynamic it) → self::E17 /* = invalid-type */
   return self::E17|(it);
-static inline-class-member method E18|(dynamic it) → self::E18 {
-  lowered final self::E18 #this = it;
+static inline-class-member method E18|(dynamic it) → self::E18 /* = invalid-type */ {
+  lowered final self::E18 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E18|_#new#tearOff(dynamic it) → self::E18
+static inline-class-member method E18|_#new#tearOff(dynamic it) → self::E18 /* = invalid-type */
   return self::E18|(it);
-static inline-class-member method E19a|(dynamic it) → self::E19a {
-  lowered final self::E19a #this = it;
+static inline-class-member method E19a|(dynamic it) → self::E19a /* =(self::E19b /* = core::int */, self::E19b /* = core::int */) */ {
+  lowered final self::E19a /* =(self::E19b /* = core::int */, self::E19b /* = core::int */) */ #this = it;
   return #this;
 }
-static inline-class-member method E19a|_#new#tearOff(dynamic it) → self::E19a
+static inline-class-member method E19a|_#new#tearOff(dynamic it) → self::E19a /* =(self::E19b /* = core::int */, self::E19b /* = core::int */) */
   return self::E19a|(it);
-static inline-class-member method E19b|(dynamic it) → self::E19b {
-  lowered final self::E19b #this = it;
+static inline-class-member method E19b|(dynamic it) → self::E19b /* = core::int */ {
+  lowered final self::E19b /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E19b|_#new#tearOff(dynamic it) → self::E19b
+static inline-class-member method E19b|_#new#tearOff(dynamic it) → self::E19b /* = core::int */
   return self::E19b|(it);
-static inline-class-member method E20|(dynamic it) → self::E20 {
-  lowered final self::E20 #this = it;
+static inline-class-member method E20|(dynamic it) → self::E20 /* = invalid-type */ {
+  lowered final self::E20 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E20|_#new#tearOff(dynamic it) → self::E20
+static inline-class-member method E20|_#new#tearOff(dynamic it) → self::E20 /* = invalid-type */
   return self::E20|(it);
-static inline-class-member method E21|(dynamic it) → self::E21 {
-  lowered final self::E21 #this = it;
+static inline-class-member method E21|(dynamic it) → self::E21 /* = invalid-type */ {
+  lowered final self::E21 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E21|_#new#tearOff(dynamic it) → self::E21
+static inline-class-member method E21|_#new#tearOff(dynamic it) → self::E21 /* = invalid-type */
   return self::E21|(it);
-static inline-class-member method E22|(dynamic it) → self::E22 {
-  lowered final self::E22 #this = it;
+static inline-class-member method E22|(dynamic it) → self::E22 /* = invalid-type */ {
+  lowered final self::E22 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E22|_#new#tearOff(dynamic it) → self::E22
+static inline-class-member method E22|_#new#tearOff(dynamic it) → self::E22 /* = invalid-type */
   return self::E22|(it);
-static inline-class-member method E23|(dynamic it) → self::E23 {
-  lowered final self::E23 #this = it;
+static inline-class-member method E23|(dynamic it) → self::E23 /* = invalid-type */ {
+  lowered final self::E23 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E23|_#new#tearOff(dynamic it) → self::E23
+static inline-class-member method E23|_#new#tearOff(dynamic it) → self::E23 /* = invalid-type */
   return self::E23|(it);
-static inline-class-member method E24|<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|::T%> {
-  lowered final self::E24<self::E24|::T%> #this = it;
+static inline-class-member method E24|<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|::T%> /* = invalid-type */ {
+  lowered final self::E24<self::E24|::T%> /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E24|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|_#new#tearOff::T%>
+static inline-class-member method E24|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|_#new#tearOff::T%> /* = invalid-type */
   return self::E24|<self::E24|_#new#tearOff::T%>(it);
 static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/integers_patch.dart */ _#Alias14#fromEnvironment#tearOff<unrelated T extends core::Object? = dynamic>(core::String name, {core::int defaultValue = #C1}) → core::int
   return core::int::fromEnvironment(name, defaultValue: defaultValue);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16b fill, {core::bool growable = #C2}) → core::List<self::E16b>
-  return core::List::filled<self::E16b>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16b>
-  return core::List::empty<self::E16b>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16b>
-  return core::List::from<self::E16b>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16b> elements, {core::bool growable = #C3}) → core::List<self::E16b>
-  return core::List::of<self::E16b>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16b generator, {core::bool growable = #C3}) → core::List<self::E16b>
-  return core::List::generate<self::E16b>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16b>
-  return core::List::unmodifiable<self::E16b>(elements);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16a fill, {core::bool growable = #C2}) → core::List<self::E16a>
-  return core::List::filled<self::E16a>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16a>
-  return core::List::empty<self::E16a>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16a>
-  return core::List::from<self::E16a>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16a> elements, {core::bool growable = #C3}) → core::List<self::E16a>
-  return core::List::of<self::E16a>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16a generator, {core::bool growable = #C3}) → core::List<self::E16a>
-  return core::List::generate<self::E16a>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16a>
-  return core::List::unmodifiable<self::E16a>(elements);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#filled#tearOff<T extends self::E23>(core::int length, self::_#Alias23#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias23#filled#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16b /* = invalid-type */ fill, {core::bool growable = #C2}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::filled<self::E16b /* = invalid-type */>(length, fill, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::empty<self::E16b /* = invalid-type */>(growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::from<self::E16b /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16b /* = invalid-type */> elements, {core::bool growable = #C3}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::of<self::E16b /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16b /* = invalid-type */ generator, {core::bool growable = #C3}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::generate<self::E16b /* = invalid-type */>(length, generator, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16b /* = invalid-type */>
+  return core::List::unmodifiable<self::E16b /* = invalid-type */>(elements);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16a /* = invalid-type */ fill, {core::bool growable = #C2}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::filled<self::E16a /* = invalid-type */>(length, fill, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::empty<self::E16a /* = invalid-type */>(growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::from<self::E16a /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16a /* = invalid-type */> elements, {core::bool growable = #C3}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::of<self::E16a /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16a /* = invalid-type */ generator, {core::bool growable = #C3}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::generate<self::E16a /* = invalid-type */>(length, generator, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16a /* = invalid-type */>
+  return core::List::unmodifiable<self::E16a /* = invalid-type */>(elements);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#filled#tearOff<T extends self::E23 /* = invalid-type */>(core::int length, self::_#Alias23#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias23#filled#tearOff::T>
   return core::List::filled<self::_#Alias23#filled#tearOff::T>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#empty#tearOff<T extends self::E23>({core::bool growable = #C2}) → core::List<self::_#Alias23#empty#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#empty#tearOff<T extends self::E23 /* = invalid-type */>({core::bool growable = #C2}) → core::List<self::_#Alias23#empty#tearOff::T>
   return core::List::empty<self::_#Alias23#empty#tearOff::T>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#from#tearOff<T extends self::E23>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#from#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#from#tearOff<T extends self::E23 /* = invalid-type */>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#from#tearOff::T>
   return core::List::from<self::_#Alias23#from#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#of#tearOff<T extends self::E23>(core::Iterable<self::_#Alias23#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#of#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#of#tearOff<T extends self::E23 /* = invalid-type */>(core::Iterable<self::_#Alias23#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#of#tearOff::T>
   return core::List::of<self::_#Alias23#of#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#generate#tearOff<T extends self::E23>(core::int length, (core::int) → self::_#Alias23#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias23#generate#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#generate#tearOff<T extends self::E23 /* = invalid-type */>(core::int length, (core::int) → self::_#Alias23#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias23#generate#tearOff::T>
   return core::List::generate<self::_#Alias23#generate#tearOff::T>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#unmodifiable#tearOff<T extends self::E23>(core::Iterable<dynamic> elements) → core::List<self::_#Alias23#unmodifiable#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#unmodifiable#tearOff<T extends self::E23 /* = invalid-type */>(core::Iterable<dynamic> elements) → core::List<self::_#Alias23#unmodifiable#tearOff::T>
   return core::List::unmodifiable<self::_#Alias23#unmodifiable#tearOff::T>(elements);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#filled#tearOff<T extends self::E24<self::_#Alias24#filled#tearOff::T> = self::E24<dynamic>>(core::int length, self::_#Alias24#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias24#filled#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#filled#tearOff<T extends self::E24<self::_#Alias24#filled#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::int length, self::_#Alias24#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias24#filled#tearOff::T>
   return core::List::filled<self::_#Alias24#filled#tearOff::T>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#empty#tearOff<T extends self::E24<self::_#Alias24#empty#tearOff::T> = self::E24<dynamic>>({core::bool growable = #C2}) → core::List<self::_#Alias24#empty#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#empty#tearOff<T extends self::E24<self::_#Alias24#empty#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>({core::bool growable = #C2}) → core::List<self::_#Alias24#empty#tearOff::T>
   return core::List::empty<self::_#Alias24#empty#tearOff::T>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#from#tearOff<T extends self::E24<self::_#Alias24#from#tearOff::T> = self::E24<dynamic>>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#from#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#from#tearOff<T extends self::E24<self::_#Alias24#from#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#from#tearOff::T>
   return core::List::from<self::_#Alias24#from#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#of#tearOff<T extends self::E24<self::_#Alias24#of#tearOff::T> = self::E24<dynamic>>(core::Iterable<self::_#Alias24#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#of#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#of#tearOff<T extends self::E24<self::_#Alias24#of#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::Iterable<self::_#Alias24#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#of#tearOff::T>
   return core::List::of<self::_#Alias24#of#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#generate#tearOff<T extends self::E24<self::_#Alias24#generate#tearOff::T> = self::E24<dynamic>>(core::int length, (core::int) → self::_#Alias24#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias24#generate#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#generate#tearOff<T extends self::E24<self::_#Alias24#generate#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::int length, (core::int) → self::_#Alias24#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias24#generate#tearOff::T>
   return core::List::generate<self::_#Alias24#generate#tearOff::T>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#unmodifiable#tearOff<T extends self::E24<self::_#Alias24#unmodifiable#tearOff::T> = self::E24<dynamic>>(core::Iterable<dynamic> elements) → core::List<self::_#Alias24#unmodifiable#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#unmodifiable#tearOff<T extends self::E24<self::_#Alias24#unmodifiable#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::Iterable<dynamic> elements) → core::List<self::_#Alias24#unmodifiable#tearOff::T>
   return core::List::unmodifiable<self::_#Alias24#unmodifiable#tearOff::T>(elements);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.weak.expect
index 9d381d2fe93..f5a49655b5c 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.weak.expect
@@ -194,23 +194,23 @@ library;
 import self as self;
 import "dart:core" as core;
 
-typedef Alias9 = self::E9;
-typedef Alias10<unrelated T extends core::Object? = dynamic> = self::E10<T%>;
-typedef Alias11 = () → self::E11;
-typedef Alias12 = (self::E12) → void;
-typedef Alias13 = <T extends self::E13 = dynamic>() → void;
+typedef Alias9 = self::E9 /* = invalid-type */;
+typedef Alias10<unrelated T extends core::Object? = dynamic> = self::E10<T%> /* = invalid-type */;
+typedef Alias11 = () → self::E11 /* = invalid-type */;
+typedef Alias12 = (self::E12 /* = invalid-type */) → void;
+typedef Alias13 = <T extends self::E13 /* = invalid-type */ = dynamic>() → void;
 typedef Alias14<unrelated T extends core::Object? = dynamic> = core::int;
 typedef Alias15<T extends core::Object? = dynamic> = core::List<T%>;
-typedef Alias16a<unrelated T extends core::Object? = dynamic> = core::List<self::E16b>;
-typedef Alias16b<unrelated T extends core::Object? = dynamic> = core::List<self::E16a>;
-typedef Alias18a<unrelated T extends core::Object? = dynamic> = (self::E18) → void;
+typedef Alias16a<unrelated T extends core::Object? = dynamic> = core::List<self::E16b /* = invalid-type */>;
+typedef Alias16b<unrelated T extends core::Object? = dynamic> = core::List<self::E16a /* = invalid-type */>;
+typedef Alias18a<unrelated T extends core::Object? = dynamic> = (self::E18 /* = invalid-type */) → void;
 typedef Alias18b<contravariant T extends core::Object? = dynamic> = (T%) → void;
 typedef Alias20 = invalid-type;
 typedef Alias21 = core::int;
 typedef Alias22a = invalid-type;
 typedef Alias22b = core::int;
-typedef Alias23<T extends self::E23> = core::List<T>;
-typedef Alias24<T extends self::E24<T> = self::E24<dynamic>> = core::List<T>;
+typedef Alias23<T extends self::E23 /* = invalid-type */> = core::List<T>;
+typedef Alias24<T extends self::E24<T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */> = core::List<T>;
 extension type E1(invalid-type it) {
   constructor • = self::E1|;
   tearoff • = self::E1|_#new#tearOff;
@@ -303,7 +303,7 @@ extension type E18(invalid-type it) {
   constructor • = self::E18|;
   tearoff • = self::E18|_#new#tearOff;
 }
-extension type E19a((self::E19b, self::E19b) it) {
+extension type E19a((self::E19b /* = core::int */, self::E19b /* = core::int */) it) {
   constructor • = self::E19a|;
   tearoff • = self::E19a|_#new#tearOff;
 }
@@ -331,235 +331,235 @@ extension type E24<T extends core::Object? = dynamic>(invalid-type it) {
   constructor • = self::E24|;
   tearoff • = self::E24|_#new#tearOff;
 }
-static inline-class-member method E1|(dynamic it) → self::E1 {
-  lowered final self::E1 #this = it;
+static inline-class-member method E1|(dynamic it) → self::E1 /* = invalid-type */ {
+  lowered final self::E1 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E1|_#new#tearOff(dynamic it) → self::E1
+static inline-class-member method E1|_#new#tearOff(dynamic it) → self::E1 /* = invalid-type */
   return self::E1|(it);
-static inline-class-member method E2a|(dynamic it) → self::E2a {
-  lowered final self::E2a #this = it;
+static inline-class-member method E2a|(dynamic it) → self::E2a /* = invalid-type */ {
+  lowered final self::E2a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E2a|_#new#tearOff(dynamic it) → self::E2a
+static inline-class-member method E2a|_#new#tearOff(dynamic it) → self::E2a /* = invalid-type */
   return self::E2a|(it);
-static inline-class-member method E2b|(dynamic it) → self::E2b {
-  lowered final self::E2b #this = it;
+static inline-class-member method E2b|(dynamic it) → self::E2b /* = invalid-type */ {
+  lowered final self::E2b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E2b|_#new#tearOff(dynamic it) → self::E2b
+static inline-class-member method E2b|_#new#tearOff(dynamic it) → self::E2b /* = invalid-type */
   return self::E2b|(it);
-static inline-class-member method E3a|(dynamic it) → self::E3a {
-  lowered final self::E3a #this = it;
+static inline-class-member method E3a|(dynamic it) → self::E3a /* = invalid-type */ {
+  lowered final self::E3a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E3a|_#new#tearOff(dynamic it) → self::E3a
+static inline-class-member method E3a|_#new#tearOff(dynamic it) → self::E3a /* = invalid-type */
   return self::E3a|(it);
-static inline-class-member method E3b|(dynamic it) → self::E3b {
-  lowered final self::E3b #this = it;
+static inline-class-member method E3b|(dynamic it) → self::E3b /* = invalid-type */ {
+  lowered final self::E3b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E3b|_#new#tearOff(dynamic it) → self::E3b
+static inline-class-member method E3b|_#new#tearOff(dynamic it) → self::E3b /* = invalid-type */
   return self::E3b|(it);
-static inline-class-member method E3c|(dynamic it) → self::E3c {
-  lowered final self::E3c #this = it;
+static inline-class-member method E3c|(dynamic it) → self::E3c /* = invalid-type */ {
+  lowered final self::E3c /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E3c|_#new#tearOff(dynamic it) → self::E3c
+static inline-class-member method E3c|_#new#tearOff(dynamic it) → self::E3c /* = invalid-type */
   return self::E3c|(it);
-static inline-class-member method E4|(dynamic it) → self::E4 {
-  lowered final self::E4 #this = it;
+static inline-class-member method E4|(dynamic it) → self::E4 /* = invalid-type */ {
+  lowered final self::E4 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E4|_#new#tearOff(dynamic it) → self::E4
+static inline-class-member method E4|_#new#tearOff(dynamic it) → self::E4 /* = invalid-type */
   return self::E4|(it);
-static inline-class-member method E5|(dynamic it) → self::E5 {
-  lowered final self::E5 #this = it;
+static inline-class-member method E5|(dynamic it) → self::E5 /* = invalid-type */ {
+  lowered final self::E5 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E5|_#new#tearOff(dynamic it) → self::E5
+static inline-class-member method E5|_#new#tearOff(dynamic it) → self::E5 /* = invalid-type */
   return self::E5|(it);
-static inline-class-member method E6|(dynamic it) → self::E6 {
-  lowered final self::E6 #this = it;
+static inline-class-member method E6|(dynamic it) → self::E6 /* = invalid-type */ {
+  lowered final self::E6 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E6|_#new#tearOff(dynamic it) → self::E6
+static inline-class-member method E6|_#new#tearOff(dynamic it) → self::E6 /* = invalid-type */
   return self::E6|(it);
-static inline-class-member method E7|_#new#tearOff(dynamic it) → self::E7
+static inline-class-member method E7|_#new#tearOff(dynamic it) → self::E7 /* = invalid-type */
   return self::E7|(it);
-static inline-class-member method E7|(dynamic it) → self::E7 {
-  lowered final self::E7 #this = it;
+static inline-class-member method E7|(dynamic it) → self::E7 /* = invalid-type */ {
+  lowered final self::E7 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E8|<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|::T%> {
-  lowered final self::E8<self::E8|::T%> #this = it;
+static inline-class-member method E8|<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|::T%> /* = invalid-type */ {
+  lowered final self::E8<self::E8|::T%> /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E8|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|_#new#tearOff::T%>
+static inline-class-member method E8|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|_#new#tearOff::T%> /* = invalid-type */
   return self::E8|<self::E8|_#new#tearOff::T%>(it);
-static inline-class-member method E9|(dynamic it) → self::E9 {
-  lowered final self::E9 #this = it;
+static inline-class-member method E9|(dynamic it) → self::E9 /* = invalid-type */ {
+  lowered final self::E9 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E9|_#new#tearOff(dynamic it) → self::E9
+static inline-class-member method E9|_#new#tearOff(dynamic it) → self::E9 /* = invalid-type */
   return self::E9|(it);
-static inline-class-member method E10|<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|::T%> {
-  lowered final self::E10<self::E10|::T%> #this = it;
+static inline-class-member method E10|<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|::T%> /* = invalid-type */ {
+  lowered final self::E10<self::E10|::T%> /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E10|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|_#new#tearOff::T%>
+static inline-class-member method E10|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|_#new#tearOff::T%> /* = invalid-type */
   return self::E10|<self::E10|_#new#tearOff::T%>(it);
-static inline-class-member method E11|(dynamic it) → self::E11 {
-  lowered final self::E11 #this = it;
+static inline-class-member method E11|(dynamic it) → self::E11 /* = invalid-type */ {
+  lowered final self::E11 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E11|_#new#tearOff(dynamic it) → self::E11
+static inline-class-member method E11|_#new#tearOff(dynamic it) → self::E11 /* = invalid-type */
   return self::E11|(it);
-static inline-class-member method E12|(dynamic it) → self::E12 {
-  lowered final self::E12 #this = it;
+static inline-class-member method E12|(dynamic it) → self::E12 /* = invalid-type */ {
+  lowered final self::E12 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E12|_#new#tearOff(dynamic it) → self::E12
+static inline-class-member method E12|_#new#tearOff(dynamic it) → self::E12 /* = invalid-type */
   return self::E12|(it);
-static inline-class-member method E13|(dynamic it) → self::E13 {
-  lowered final self::E13 #this = it;
+static inline-class-member method E13|(dynamic it) → self::E13 /* = invalid-type */ {
+  lowered final self::E13 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E13|_#new#tearOff(dynamic it) → self::E13
+static inline-class-member method E13|_#new#tearOff(dynamic it) → self::E13 /* = invalid-type */
   return self::E13|(it);
-static inline-class-member method E14|(dynamic it) → self::E14 {
-  lowered final self::E14 #this = it;
+static inline-class-member method E14|(dynamic it) → self::E14 /* = core::int */ {
+  lowered final self::E14 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E14|_#new#tearOff(dynamic it) → self::E14
+static inline-class-member method E14|_#new#tearOff(dynamic it) → self::E14 /* = core::int */
   return self::E14|(it);
-static inline-class-member method E15a|(dynamic it) → self::E15a {
-  lowered final self::E15a #this = it;
+static inline-class-member method E15a|(dynamic it) → self::E15a /* = invalid-type */ {
+  lowered final self::E15a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E15a|_#new#tearOff(dynamic it) → self::E15a
+static inline-class-member method E15a|_#new#tearOff(dynamic it) → self::E15a /* = invalid-type */
   return self::E15a|(it);
-static inline-class-member method E15b|(dynamic it) → self::E15b {
-  lowered final self::E15b #this = it;
+static inline-class-member method E15b|(dynamic it) → self::E15b /* = invalid-type */ {
+  lowered final self::E15b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E15b|_#new#tearOff(dynamic it) → self::E15b
+static inline-class-member method E15b|_#new#tearOff(dynamic it) → self::E15b /* = invalid-type */
   return self::E15b|(it);
-static inline-class-member method E16a|(dynamic it) → self::E16a {
-  lowered final self::E16a #this = it;
+static inline-class-member method E16a|(dynamic it) → self::E16a /* = invalid-type */ {
+  lowered final self::E16a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E16a|_#new#tearOff(dynamic it) → self::E16a
+static inline-class-member method E16a|_#new#tearOff(dynamic it) → self::E16a /* = invalid-type */
   return self::E16a|(it);
-static inline-class-member method E16b|(dynamic it) → self::E16b {
-  lowered final self::E16b #this = it;
+static inline-class-member method E16b|(dynamic it) → self::E16b /* = invalid-type */ {
+  lowered final self::E16b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E16b|_#new#tearOff(dynamic it) → self::E16b
+static inline-class-member method E16b|_#new#tearOff(dynamic it) → self::E16b /* = invalid-type */
   return self::E16b|(it);
-static inline-class-member method E17|(dynamic it) → self::E17 {
-  lowered final self::E17 #this = it;
+static inline-class-member method E17|(dynamic it) → self::E17 /* = invalid-type */ {
+  lowered final self::E17 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E17|_#new#tearOff(dynamic it) → self::E17
+static inline-class-member method E17|_#new#tearOff(dynamic it) → self::E17 /* = invalid-type */
   return self::E17|(it);
-static inline-class-member method E18|(dynamic it) → self::E18 {
-  lowered final self::E18 #this = it;
+static inline-class-member method E18|(dynamic it) → self::E18 /* = invalid-type */ {
+  lowered final self::E18 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E18|_#new#tearOff(dynamic it) → self::E18
+static inline-class-member method E18|_#new#tearOff(dynamic it) → self::E18 /* = invalid-type */
   return self::E18|(it);
-static inline-class-member method E19a|(dynamic it) → self::E19a {
-  lowered final self::E19a #this = it;
+static inline-class-member method E19a|(dynamic it) → self::E19a /* =(self::E19b /* = core::int */, self::E19b /* = core::int */) */ {
+  lowered final self::E19a /* =(self::E19b /* = core::int */, self::E19b /* = core::int */) */ #this = it;
   return #this;
 }
-static inline-class-member method E19a|_#new#tearOff(dynamic it) → self::E19a
+static inline-class-member method E19a|_#new#tearOff(dynamic it) → self::E19a /* =(self::E19b /* = core::int */, self::E19b /* = core::int */) */
   return self::E19a|(it);
-static inline-class-member method E19b|(dynamic it) → self::E19b {
-  lowered final self::E19b #this = it;
+static inline-class-member method E19b|(dynamic it) → self::E19b /* = core::int */ {
+  lowered final self::E19b /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E19b|_#new#tearOff(dynamic it) → self::E19b
+static inline-class-member method E19b|_#new#tearOff(dynamic it) → self::E19b /* = core::int */
   return self::E19b|(it);
-static inline-class-member method E20|(dynamic it) → self::E20 {
-  lowered final self::E20 #this = it;
+static inline-class-member method E20|(dynamic it) → self::E20 /* = invalid-type */ {
+  lowered final self::E20 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E20|_#new#tearOff(dynamic it) → self::E20
+static inline-class-member method E20|_#new#tearOff(dynamic it) → self::E20 /* = invalid-type */
   return self::E20|(it);
-static inline-class-member method E21|(dynamic it) → self::E21 {
-  lowered final self::E21 #this = it;
+static inline-class-member method E21|(dynamic it) → self::E21 /* = invalid-type */ {
+  lowered final self::E21 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E21|_#new#tearOff(dynamic it) → self::E21
+static inline-class-member method E21|_#new#tearOff(dynamic it) → self::E21 /* = invalid-type */
   return self::E21|(it);
-static inline-class-member method E22|(dynamic it) → self::E22 {
-  lowered final self::E22 #this = it;
+static inline-class-member method E22|(dynamic it) → self::E22 /* = invalid-type */ {
+  lowered final self::E22 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E22|_#new#tearOff(dynamic it) → self::E22
+static inline-class-member method E22|_#new#tearOff(dynamic it) → self::E22 /* = invalid-type */
   return self::E22|(it);
-static inline-class-member method E23|(dynamic it) → self::E23 {
-  lowered final self::E23 #this = it;
+static inline-class-member method E23|(dynamic it) → self::E23 /* = invalid-type */ {
+  lowered final self::E23 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E23|_#new#tearOff(dynamic it) → self::E23
+static inline-class-member method E23|_#new#tearOff(dynamic it) → self::E23 /* = invalid-type */
   return self::E23|(it);
-static inline-class-member method E24|<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|::T%> {
-  lowered final self::E24<self::E24|::T%> #this = it;
+static inline-class-member method E24|<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|::T%> /* = invalid-type */ {
+  lowered final self::E24<self::E24|::T%> /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E24|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|_#new#tearOff::T%>
+static inline-class-member method E24|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|_#new#tearOff::T%> /* = invalid-type */
   return self::E24|<self::E24|_#new#tearOff::T%>(it);
 static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/integers_patch.dart */ _#Alias14#fromEnvironment#tearOff<unrelated T extends core::Object? = dynamic>(core::String name, {core::int defaultValue = #C1}) → core::int
   return core::int::fromEnvironment(name, defaultValue: defaultValue);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16b fill, {core::bool growable = #C2}) → core::List<self::E16b>
-  return core::List::filled<self::E16b>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16b>
-  return core::List::empty<self::E16b>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16b>
-  return core::List::from<self::E16b>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16b> elements, {core::bool growable = #C3}) → core::List<self::E16b>
-  return core::List::of<self::E16b>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16b generator, {core::bool growable = #C3}) → core::List<self::E16b>
-  return core::List::generate<self::E16b>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16b>
-  return core::List::unmodifiable<self::E16b>(elements);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16a fill, {core::bool growable = #C2}) → core::List<self::E16a>
-  return core::List::filled<self::E16a>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16a>
-  return core::List::empty<self::E16a>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16a>
-  return core::List::from<self::E16a>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16a> elements, {core::bool growable = #C3}) → core::List<self::E16a>
-  return core::List::of<self::E16a>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16a generator, {core::bool growable = #C3}) → core::List<self::E16a>
-  return core::List::generate<self::E16a>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16a>
-  return core::List::unmodifiable<self::E16a>(elements);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#filled#tearOff<T extends self::E23>(core::int length, self::_#Alias23#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias23#filled#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16b /* = invalid-type */ fill, {core::bool growable = #C2}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::filled<self::E16b /* = invalid-type */>(length, fill, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::empty<self::E16b /* = invalid-type */>(growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::from<self::E16b /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16b /* = invalid-type */> elements, {core::bool growable = #C3}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::of<self::E16b /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16b /* = invalid-type */ generator, {core::bool growable = #C3}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::generate<self::E16b /* = invalid-type */>(length, generator, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16b /* = invalid-type */>
+  return core::List::unmodifiable<self::E16b /* = invalid-type */>(elements);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16a /* = invalid-type */ fill, {core::bool growable = #C2}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::filled<self::E16a /* = invalid-type */>(length, fill, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::empty<self::E16a /* = invalid-type */>(growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::from<self::E16a /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16a /* = invalid-type */> elements, {core::bool growable = #C3}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::of<self::E16a /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16a /* = invalid-type */ generator, {core::bool growable = #C3}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::generate<self::E16a /* = invalid-type */>(length, generator, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16a /* = invalid-type */>
+  return core::List::unmodifiable<self::E16a /* = invalid-type */>(elements);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#filled#tearOff<T extends self::E23 /* = invalid-type */>(core::int length, self::_#Alias23#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias23#filled#tearOff::T>
   return core::List::filled<self::_#Alias23#filled#tearOff::T>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#empty#tearOff<T extends self::E23>({core::bool growable = #C2}) → core::List<self::_#Alias23#empty#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#empty#tearOff<T extends self::E23 /* = invalid-type */>({core::bool growable = #C2}) → core::List<self::_#Alias23#empty#tearOff::T>
   return core::List::empty<self::_#Alias23#empty#tearOff::T>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#from#tearOff<T extends self::E23>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#from#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#from#tearOff<T extends self::E23 /* = invalid-type */>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#from#tearOff::T>
   return core::List::from<self::_#Alias23#from#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#of#tearOff<T extends self::E23>(core::Iterable<self::_#Alias23#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#of#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#of#tearOff<T extends self::E23 /* = invalid-type */>(core::Iterable<self::_#Alias23#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#of#tearOff::T>
   return core::List::of<self::_#Alias23#of#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#generate#tearOff<T extends self::E23>(core::int length, (core::int) → self::_#Alias23#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias23#generate#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#generate#tearOff<T extends self::E23 /* = invalid-type */>(core::int length, (core::int) → self::_#Alias23#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias23#generate#tearOff::T>
   return core::List::generate<self::_#Alias23#generate#tearOff::T>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#unmodifiable#tearOff<T extends self::E23>(core::Iterable<dynamic> elements) → core::List<self::_#Alias23#unmodifiable#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#unmodifiable#tearOff<T extends self::E23 /* = invalid-type */>(core::Iterable<dynamic> elements) → core::List<self::_#Alias23#unmodifiable#tearOff::T>
   return core::List::unmodifiable<self::_#Alias23#unmodifiable#tearOff::T>(elements);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#filled#tearOff<T extends self::E24<self::_#Alias24#filled#tearOff::T> = self::E24<dynamic>>(core::int length, self::_#Alias24#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias24#filled#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#filled#tearOff<T extends self::E24<self::_#Alias24#filled#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::int length, self::_#Alias24#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias24#filled#tearOff::T>
   return core::List::filled<self::_#Alias24#filled#tearOff::T>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#empty#tearOff<T extends self::E24<self::_#Alias24#empty#tearOff::T> = self::E24<dynamic>>({core::bool growable = #C2}) → core::List<self::_#Alias24#empty#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#empty#tearOff<T extends self::E24<self::_#Alias24#empty#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>({core::bool growable = #C2}) → core::List<self::_#Alias24#empty#tearOff::T>
   return core::List::empty<self::_#Alias24#empty#tearOff::T>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#from#tearOff<T extends self::E24<self::_#Alias24#from#tearOff::T> = self::E24<dynamic>>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#from#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#from#tearOff<T extends self::E24<self::_#Alias24#from#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#from#tearOff::T>
   return core::List::from<self::_#Alias24#from#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#of#tearOff<T extends self::E24<self::_#Alias24#of#tearOff::T> = self::E24<dynamic>>(core::Iterable<self::_#Alias24#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#of#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#of#tearOff<T extends self::E24<self::_#Alias24#of#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::Iterable<self::_#Alias24#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#of#tearOff::T>
   return core::List::of<self::_#Alias24#of#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#generate#tearOff<T extends self::E24<self::_#Alias24#generate#tearOff::T> = self::E24<dynamic>>(core::int length, (core::int) → self::_#Alias24#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias24#generate#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#generate#tearOff<T extends self::E24<self::_#Alias24#generate#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::int length, (core::int) → self::_#Alias24#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias24#generate#tearOff::T>
   return core::List::generate<self::_#Alias24#generate#tearOff::T>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#unmodifiable#tearOff<T extends self::E24<self::_#Alias24#unmodifiable#tearOff::T> = self::E24<dynamic>>(core::Iterable<dynamic> elements) → core::List<self::_#Alias24#unmodifiable#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#unmodifiable#tearOff<T extends self::E24<self::_#Alias24#unmodifiable#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::Iterable<dynamic> elements) → core::List<self::_#Alias24#unmodifiable#tearOff::T>
   return core::List::unmodifiable<self::_#Alias24#unmodifiable#tearOff::T>(elements);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.weak.modular.expect
index 9d381d2fe93..f5a49655b5c 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.weak.modular.expect
@@ -194,23 +194,23 @@ library;
 import self as self;
 import "dart:core" as core;
 
-typedef Alias9 = self::E9;
-typedef Alias10<unrelated T extends core::Object? = dynamic> = self::E10<T%>;
-typedef Alias11 = () → self::E11;
-typedef Alias12 = (self::E12) → void;
-typedef Alias13 = <T extends self::E13 = dynamic>() → void;
+typedef Alias9 = self::E9 /* = invalid-type */;
+typedef Alias10<unrelated T extends core::Object? = dynamic> = self::E10<T%> /* = invalid-type */;
+typedef Alias11 = () → self::E11 /* = invalid-type */;
+typedef Alias12 = (self::E12 /* = invalid-type */) → void;
+typedef Alias13 = <T extends self::E13 /* = invalid-type */ = dynamic>() → void;
 typedef Alias14<unrelated T extends core::Object? = dynamic> = core::int;
 typedef Alias15<T extends core::Object? = dynamic> = core::List<T%>;
-typedef Alias16a<unrelated T extends core::Object? = dynamic> = core::List<self::E16b>;
-typedef Alias16b<unrelated T extends core::Object? = dynamic> = core::List<self::E16a>;
-typedef Alias18a<unrelated T extends core::Object? = dynamic> = (self::E18) → void;
+typedef Alias16a<unrelated T extends core::Object? = dynamic> = core::List<self::E16b /* = invalid-type */>;
+typedef Alias16b<unrelated T extends core::Object? = dynamic> = core::List<self::E16a /* = invalid-type */>;
+typedef Alias18a<unrelated T extends core::Object? = dynamic> = (self::E18 /* = invalid-type */) → void;
 typedef Alias18b<contravariant T extends core::Object? = dynamic> = (T%) → void;
 typedef Alias20 = invalid-type;
 typedef Alias21 = core::int;
 typedef Alias22a = invalid-type;
 typedef Alias22b = core::int;
-typedef Alias23<T extends self::E23> = core::List<T>;
-typedef Alias24<T extends self::E24<T> = self::E24<dynamic>> = core::List<T>;
+typedef Alias23<T extends self::E23 /* = invalid-type */> = core::List<T>;
+typedef Alias24<T extends self::E24<T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */> = core::List<T>;
 extension type E1(invalid-type it) {
   constructor • = self::E1|;
   tearoff • = self::E1|_#new#tearOff;
@@ -303,7 +303,7 @@ extension type E18(invalid-type it) {
   constructor • = self::E18|;
   tearoff • = self::E18|_#new#tearOff;
 }
-extension type E19a((self::E19b, self::E19b) it) {
+extension type E19a((self::E19b /* = core::int */, self::E19b /* = core::int */) it) {
   constructor • = self::E19a|;
   tearoff • = self::E19a|_#new#tearOff;
 }
@@ -331,235 +331,235 @@ extension type E24<T extends core::Object? = dynamic>(invalid-type it) {
   constructor • = self::E24|;
   tearoff • = self::E24|_#new#tearOff;
 }
-static inline-class-member method E1|(dynamic it) → self::E1 {
-  lowered final self::E1 #this = it;
+static inline-class-member method E1|(dynamic it) → self::E1 /* = invalid-type */ {
+  lowered final self::E1 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E1|_#new#tearOff(dynamic it) → self::E1
+static inline-class-member method E1|_#new#tearOff(dynamic it) → self::E1 /* = invalid-type */
   return self::E1|(it);
-static inline-class-member method E2a|(dynamic it) → self::E2a {
-  lowered final self::E2a #this = it;
+static inline-class-member method E2a|(dynamic it) → self::E2a /* = invalid-type */ {
+  lowered final self::E2a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E2a|_#new#tearOff(dynamic it) → self::E2a
+static inline-class-member method E2a|_#new#tearOff(dynamic it) → self::E2a /* = invalid-type */
   return self::E2a|(it);
-static inline-class-member method E2b|(dynamic it) → self::E2b {
-  lowered final self::E2b #this = it;
+static inline-class-member method E2b|(dynamic it) → self::E2b /* = invalid-type */ {
+  lowered final self::E2b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E2b|_#new#tearOff(dynamic it) → self::E2b
+static inline-class-member method E2b|_#new#tearOff(dynamic it) → self::E2b /* = invalid-type */
   return self::E2b|(it);
-static inline-class-member method E3a|(dynamic it) → self::E3a {
-  lowered final self::E3a #this = it;
+static inline-class-member method E3a|(dynamic it) → self::E3a /* = invalid-type */ {
+  lowered final self::E3a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E3a|_#new#tearOff(dynamic it) → self::E3a
+static inline-class-member method E3a|_#new#tearOff(dynamic it) → self::E3a /* = invalid-type */
   return self::E3a|(it);
-static inline-class-member method E3b|(dynamic it) → self::E3b {
-  lowered final self::E3b #this = it;
+static inline-class-member method E3b|(dynamic it) → self::E3b /* = invalid-type */ {
+  lowered final self::E3b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E3b|_#new#tearOff(dynamic it) → self::E3b
+static inline-class-member method E3b|_#new#tearOff(dynamic it) → self::E3b /* = invalid-type */
   return self::E3b|(it);
-static inline-class-member method E3c|(dynamic it) → self::E3c {
-  lowered final self::E3c #this = it;
+static inline-class-member method E3c|(dynamic it) → self::E3c /* = invalid-type */ {
+  lowered final self::E3c /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E3c|_#new#tearOff(dynamic it) → self::E3c
+static inline-class-member method E3c|_#new#tearOff(dynamic it) → self::E3c /* = invalid-type */
   return self::E3c|(it);
-static inline-class-member method E4|(dynamic it) → self::E4 {
-  lowered final self::E4 #this = it;
+static inline-class-member method E4|(dynamic it) → self::E4 /* = invalid-type */ {
+  lowered final self::E4 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E4|_#new#tearOff(dynamic it) → self::E4
+static inline-class-member method E4|_#new#tearOff(dynamic it) → self::E4 /* = invalid-type */
   return self::E4|(it);
-static inline-class-member method E5|(dynamic it) → self::E5 {
-  lowered final self::E5 #this = it;
+static inline-class-member method E5|(dynamic it) → self::E5 /* = invalid-type */ {
+  lowered final self::E5 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E5|_#new#tearOff(dynamic it) → self::E5
+static inline-class-member method E5|_#new#tearOff(dynamic it) → self::E5 /* = invalid-type */
   return self::E5|(it);
-static inline-class-member method E6|(dynamic it) → self::E6 {
-  lowered final self::E6 #this = it;
+static inline-class-member method E6|(dynamic it) → self::E6 /* = invalid-type */ {
+  lowered final self::E6 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E6|_#new#tearOff(dynamic it) → self::E6
+static inline-class-member method E6|_#new#tearOff(dynamic it) → self::E6 /* = invalid-type */
   return self::E6|(it);
-static inline-class-member method E7|_#new#tearOff(dynamic it) → self::E7
+static inline-class-member method E7|_#new#tearOff(dynamic it) → self::E7 /* = invalid-type */
   return self::E7|(it);
-static inline-class-member method E7|(dynamic it) → self::E7 {
-  lowered final self::E7 #this = it;
+static inline-class-member method E7|(dynamic it) → self::E7 /* = invalid-type */ {
+  lowered final self::E7 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E8|<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|::T%> {
-  lowered final self::E8<self::E8|::T%> #this = it;
+static inline-class-member method E8|<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|::T%> /* = invalid-type */ {
+  lowered final self::E8<self::E8|::T%> /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E8|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|_#new#tearOff::T%>
+static inline-class-member method E8|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|_#new#tearOff::T%> /* = invalid-type */
   return self::E8|<self::E8|_#new#tearOff::T%>(it);
-static inline-class-member method E9|(dynamic it) → self::E9 {
-  lowered final self::E9 #this = it;
+static inline-class-member method E9|(dynamic it) → self::E9 /* = invalid-type */ {
+  lowered final self::E9 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E9|_#new#tearOff(dynamic it) → self::E9
+static inline-class-member method E9|_#new#tearOff(dynamic it) → self::E9 /* = invalid-type */
   return self::E9|(it);
-static inline-class-member method E10|<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|::T%> {
-  lowered final self::E10<self::E10|::T%> #this = it;
+static inline-class-member method E10|<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|::T%> /* = invalid-type */ {
+  lowered final self::E10<self::E10|::T%> /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E10|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|_#new#tearOff::T%>
+static inline-class-member method E10|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|_#new#tearOff::T%> /* = invalid-type */
   return self::E10|<self::E10|_#new#tearOff::T%>(it);
-static inline-class-member method E11|(dynamic it) → self::E11 {
-  lowered final self::E11 #this = it;
+static inline-class-member method E11|(dynamic it) → self::E11 /* = invalid-type */ {
+  lowered final self::E11 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E11|_#new#tearOff(dynamic it) → self::E11
+static inline-class-member method E11|_#new#tearOff(dynamic it) → self::E11 /* = invalid-type */
   return self::E11|(it);
-static inline-class-member method E12|(dynamic it) → self::E12 {
-  lowered final self::E12 #this = it;
+static inline-class-member method E12|(dynamic it) → self::E12 /* = invalid-type */ {
+  lowered final self::E12 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E12|_#new#tearOff(dynamic it) → self::E12
+static inline-class-member method E12|_#new#tearOff(dynamic it) → self::E12 /* = invalid-type */
   return self::E12|(it);
-static inline-class-member method E13|(dynamic it) → self::E13 {
-  lowered final self::E13 #this = it;
+static inline-class-member method E13|(dynamic it) → self::E13 /* = invalid-type */ {
+  lowered final self::E13 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E13|_#new#tearOff(dynamic it) → self::E13
+static inline-class-member method E13|_#new#tearOff(dynamic it) → self::E13 /* = invalid-type */
   return self::E13|(it);
-static inline-class-member method E14|(dynamic it) → self::E14 {
-  lowered final self::E14 #this = it;
+static inline-class-member method E14|(dynamic it) → self::E14 /* = core::int */ {
+  lowered final self::E14 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E14|_#new#tearOff(dynamic it) → self::E14
+static inline-class-member method E14|_#new#tearOff(dynamic it) → self::E14 /* = core::int */
   return self::E14|(it);
-static inline-class-member method E15a|(dynamic it) → self::E15a {
-  lowered final self::E15a #this = it;
+static inline-class-member method E15a|(dynamic it) → self::E15a /* = invalid-type */ {
+  lowered final self::E15a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E15a|_#new#tearOff(dynamic it) → self::E15a
+static inline-class-member method E15a|_#new#tearOff(dynamic it) → self::E15a /* = invalid-type */
   return self::E15a|(it);
-static inline-class-member method E15b|(dynamic it) → self::E15b {
-  lowered final self::E15b #this = it;
+static inline-class-member method E15b|(dynamic it) → self::E15b /* = invalid-type */ {
+  lowered final self::E15b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E15b|_#new#tearOff(dynamic it) → self::E15b
+static inline-class-member method E15b|_#new#tearOff(dynamic it) → self::E15b /* = invalid-type */
   return self::E15b|(it);
-static inline-class-member method E16a|(dynamic it) → self::E16a {
-  lowered final self::E16a #this = it;
+static inline-class-member method E16a|(dynamic it) → self::E16a /* = invalid-type */ {
+  lowered final self::E16a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E16a|_#new#tearOff(dynamic it) → self::E16a
+static inline-class-member method E16a|_#new#tearOff(dynamic it) → self::E16a /* = invalid-type */
   return self::E16a|(it);
-static inline-class-member method E16b|(dynamic it) → self::E16b {
-  lowered final self::E16b #this = it;
+static inline-class-member method E16b|(dynamic it) → self::E16b /* = invalid-type */ {
+  lowered final self::E16b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E16b|_#new#tearOff(dynamic it) → self::E16b
+static inline-class-member method E16b|_#new#tearOff(dynamic it) → self::E16b /* = invalid-type */
   return self::E16b|(it);
-static inline-class-member method E17|(dynamic it) → self::E17 {
-  lowered final self::E17 #this = it;
+static inline-class-member method E17|(dynamic it) → self::E17 /* = invalid-type */ {
+  lowered final self::E17 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E17|_#new#tearOff(dynamic it) → self::E17
+static inline-class-member method E17|_#new#tearOff(dynamic it) → self::E17 /* = invalid-type */
   return self::E17|(it);
-static inline-class-member method E18|(dynamic it) → self::E18 {
-  lowered final self::E18 #this = it;
+static inline-class-member method E18|(dynamic it) → self::E18 /* = invalid-type */ {
+  lowered final self::E18 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E18|_#new#tearOff(dynamic it) → self::E18
+static inline-class-member method E18|_#new#tearOff(dynamic it) → self::E18 /* = invalid-type */
   return self::E18|(it);
-static inline-class-member method E19a|(dynamic it) → self::E19a {
-  lowered final self::E19a #this = it;
+static inline-class-member method E19a|(dynamic it) → self::E19a /* =(self::E19b /* = core::int */, self::E19b /* = core::int */) */ {
+  lowered final self::E19a /* =(self::E19b /* = core::int */, self::E19b /* = core::int */) */ #this = it;
   return #this;
 }
-static inline-class-member method E19a|_#new#tearOff(dynamic it) → self::E19a
+static inline-class-member method E19a|_#new#tearOff(dynamic it) → self::E19a /* =(self::E19b /* = core::int */, self::E19b /* = core::int */) */
   return self::E19a|(it);
-static inline-class-member method E19b|(dynamic it) → self::E19b {
-  lowered final self::E19b #this = it;
+static inline-class-member method E19b|(dynamic it) → self::E19b /* = core::int */ {
+  lowered final self::E19b /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E19b|_#new#tearOff(dynamic it) → self::E19b
+static inline-class-member method E19b|_#new#tearOff(dynamic it) → self::E19b /* = core::int */
   return self::E19b|(it);
-static inline-class-member method E20|(dynamic it) → self::E20 {
-  lowered final self::E20 #this = it;
+static inline-class-member method E20|(dynamic it) → self::E20 /* = invalid-type */ {
+  lowered final self::E20 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E20|_#new#tearOff(dynamic it) → self::E20
+static inline-class-member method E20|_#new#tearOff(dynamic it) → self::E20 /* = invalid-type */
   return self::E20|(it);
-static inline-class-member method E21|(dynamic it) → self::E21 {
-  lowered final self::E21 #this = it;
+static inline-class-member method E21|(dynamic it) → self::E21 /* = invalid-type */ {
+  lowered final self::E21 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E21|_#new#tearOff(dynamic it) → self::E21
+static inline-class-member method E21|_#new#tearOff(dynamic it) → self::E21 /* = invalid-type */
   return self::E21|(it);
-static inline-class-member method E22|(dynamic it) → self::E22 {
-  lowered final self::E22 #this = it;
+static inline-class-member method E22|(dynamic it) → self::E22 /* = invalid-type */ {
+  lowered final self::E22 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E22|_#new#tearOff(dynamic it) → self::E22
+static inline-class-member method E22|_#new#tearOff(dynamic it) → self::E22 /* = invalid-type */
   return self::E22|(it);
-static inline-class-member method E23|(dynamic it) → self::E23 {
-  lowered final self::E23 #this = it;
+static inline-class-member method E23|(dynamic it) → self::E23 /* = invalid-type */ {
+  lowered final self::E23 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E23|_#new#tearOff(dynamic it) → self::E23
+static inline-class-member method E23|_#new#tearOff(dynamic it) → self::E23 /* = invalid-type */
   return self::E23|(it);
-static inline-class-member method E24|<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|::T%> {
-  lowered final self::E24<self::E24|::T%> #this = it;
+static inline-class-member method E24|<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|::T%> /* = invalid-type */ {
+  lowered final self::E24<self::E24|::T%> /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E24|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|_#new#tearOff::T%>
+static inline-class-member method E24|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|_#new#tearOff::T%> /* = invalid-type */
   return self::E24|<self::E24|_#new#tearOff::T%>(it);
 static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/integers_patch.dart */ _#Alias14#fromEnvironment#tearOff<unrelated T extends core::Object? = dynamic>(core::String name, {core::int defaultValue = #C1}) → core::int
   return core::int::fromEnvironment(name, defaultValue: defaultValue);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16b fill, {core::bool growable = #C2}) → core::List<self::E16b>
-  return core::List::filled<self::E16b>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16b>
-  return core::List::empty<self::E16b>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16b>
-  return core::List::from<self::E16b>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16b> elements, {core::bool growable = #C3}) → core::List<self::E16b>
-  return core::List::of<self::E16b>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16b generator, {core::bool growable = #C3}) → core::List<self::E16b>
-  return core::List::generate<self::E16b>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16b>
-  return core::List::unmodifiable<self::E16b>(elements);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16a fill, {core::bool growable = #C2}) → core::List<self::E16a>
-  return core::List::filled<self::E16a>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16a>
-  return core::List::empty<self::E16a>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16a>
-  return core::List::from<self::E16a>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16a> elements, {core::bool growable = #C3}) → core::List<self::E16a>
-  return core::List::of<self::E16a>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16a generator, {core::bool growable = #C3}) → core::List<self::E16a>
-  return core::List::generate<self::E16a>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16a>
-  return core::List::unmodifiable<self::E16a>(elements);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#filled#tearOff<T extends self::E23>(core::int length, self::_#Alias23#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias23#filled#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16b /* = invalid-type */ fill, {core::bool growable = #C2}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::filled<self::E16b /* = invalid-type */>(length, fill, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::empty<self::E16b /* = invalid-type */>(growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::from<self::E16b /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16b /* = invalid-type */> elements, {core::bool growable = #C3}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::of<self::E16b /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16b /* = invalid-type */ generator, {core::bool growable = #C3}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::generate<self::E16b /* = invalid-type */>(length, generator, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16b /* = invalid-type */>
+  return core::List::unmodifiable<self::E16b /* = invalid-type */>(elements);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16a /* = invalid-type */ fill, {core::bool growable = #C2}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::filled<self::E16a /* = invalid-type */>(length, fill, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::empty<self::E16a /* = invalid-type */>(growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::from<self::E16a /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16a /* = invalid-type */> elements, {core::bool growable = #C3}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::of<self::E16a /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16a /* = invalid-type */ generator, {core::bool growable = #C3}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::generate<self::E16a /* = invalid-type */>(length, generator, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16a /* = invalid-type */>
+  return core::List::unmodifiable<self::E16a /* = invalid-type */>(elements);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#filled#tearOff<T extends self::E23 /* = invalid-type */>(core::int length, self::_#Alias23#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias23#filled#tearOff::T>
   return core::List::filled<self::_#Alias23#filled#tearOff::T>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#empty#tearOff<T extends self::E23>({core::bool growable = #C2}) → core::List<self::_#Alias23#empty#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#empty#tearOff<T extends self::E23 /* = invalid-type */>({core::bool growable = #C2}) → core::List<self::_#Alias23#empty#tearOff::T>
   return core::List::empty<self::_#Alias23#empty#tearOff::T>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#from#tearOff<T extends self::E23>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#from#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#from#tearOff<T extends self::E23 /* = invalid-type */>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#from#tearOff::T>
   return core::List::from<self::_#Alias23#from#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#of#tearOff<T extends self::E23>(core::Iterable<self::_#Alias23#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#of#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#of#tearOff<T extends self::E23 /* = invalid-type */>(core::Iterable<self::_#Alias23#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#of#tearOff::T>
   return core::List::of<self::_#Alias23#of#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#generate#tearOff<T extends self::E23>(core::int length, (core::int) → self::_#Alias23#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias23#generate#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#generate#tearOff<T extends self::E23 /* = invalid-type */>(core::int length, (core::int) → self::_#Alias23#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias23#generate#tearOff::T>
   return core::List::generate<self::_#Alias23#generate#tearOff::T>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#unmodifiable#tearOff<T extends self::E23>(core::Iterable<dynamic> elements) → core::List<self::_#Alias23#unmodifiable#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#unmodifiable#tearOff<T extends self::E23 /* = invalid-type */>(core::Iterable<dynamic> elements) → core::List<self::_#Alias23#unmodifiable#tearOff::T>
   return core::List::unmodifiable<self::_#Alias23#unmodifiable#tearOff::T>(elements);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#filled#tearOff<T extends self::E24<self::_#Alias24#filled#tearOff::T> = self::E24<dynamic>>(core::int length, self::_#Alias24#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias24#filled#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#filled#tearOff<T extends self::E24<self::_#Alias24#filled#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::int length, self::_#Alias24#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias24#filled#tearOff::T>
   return core::List::filled<self::_#Alias24#filled#tearOff::T>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#empty#tearOff<T extends self::E24<self::_#Alias24#empty#tearOff::T> = self::E24<dynamic>>({core::bool growable = #C2}) → core::List<self::_#Alias24#empty#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#empty#tearOff<T extends self::E24<self::_#Alias24#empty#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>({core::bool growable = #C2}) → core::List<self::_#Alias24#empty#tearOff::T>
   return core::List::empty<self::_#Alias24#empty#tearOff::T>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#from#tearOff<T extends self::E24<self::_#Alias24#from#tearOff::T> = self::E24<dynamic>>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#from#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#from#tearOff<T extends self::E24<self::_#Alias24#from#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#from#tearOff::T>
   return core::List::from<self::_#Alias24#from#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#of#tearOff<T extends self::E24<self::_#Alias24#of#tearOff::T> = self::E24<dynamic>>(core::Iterable<self::_#Alias24#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#of#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#of#tearOff<T extends self::E24<self::_#Alias24#of#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::Iterable<self::_#Alias24#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#of#tearOff::T>
   return core::List::of<self::_#Alias24#of#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#generate#tearOff<T extends self::E24<self::_#Alias24#generate#tearOff::T> = self::E24<dynamic>>(core::int length, (core::int) → self::_#Alias24#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias24#generate#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#generate#tearOff<T extends self::E24<self::_#Alias24#generate#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::int length, (core::int) → self::_#Alias24#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias24#generate#tearOff::T>
   return core::List::generate<self::_#Alias24#generate#tearOff::T>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#unmodifiable#tearOff<T extends self::E24<self::_#Alias24#unmodifiable#tearOff::T> = self::E24<dynamic>>(core::Iterable<dynamic> elements) → core::List<self::_#Alias24#unmodifiable#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#unmodifiable#tearOff<T extends self::E24<self::_#Alias24#unmodifiable#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::Iterable<dynamic> elements) → core::List<self::_#Alias24#unmodifiable#tearOff::T>
   return core::List::unmodifiable<self::_#Alias24#unmodifiable#tearOff::T>(elements);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.weak.outline.expect
index 96a356413d0..b65ad3e2523 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.weak.outline.expect
@@ -194,23 +194,23 @@ library;
 import self as self;
 import "dart:core" as core;
 
-typedef Alias9 = self::E9;
-typedef Alias10<unrelated T extends core::Object? = dynamic> = self::E10<T%>;
-typedef Alias11 = () → self::E11;
-typedef Alias12 = (self::E12) → void;
-typedef Alias13 = <T extends self::E13 = dynamic>() → void;
+typedef Alias9 = self::E9 /* = invalid-type */;
+typedef Alias10<unrelated T extends core::Object? = dynamic> = self::E10<T%> /* = invalid-type */;
+typedef Alias11 = () → self::E11 /* = invalid-type */;
+typedef Alias12 = (self::E12 /* = invalid-type */) → void;
+typedef Alias13 = <T extends self::E13 /* = invalid-type */ = dynamic>() → void;
 typedef Alias14<unrelated T extends core::Object? = dynamic> = core::int;
 typedef Alias15<T extends core::Object? = dynamic> = core::List<T%>;
-typedef Alias16a<unrelated T extends core::Object? = dynamic> = core::List<self::E16b>;
-typedef Alias16b<unrelated T extends core::Object? = dynamic> = core::List<self::E16a>;
-typedef Alias18a<unrelated T extends core::Object? = dynamic> = (self::E18) → void;
+typedef Alias16a<unrelated T extends core::Object? = dynamic> = core::List<self::E16b /* = invalid-type */>;
+typedef Alias16b<unrelated T extends core::Object? = dynamic> = core::List<self::E16a /* = invalid-type */>;
+typedef Alias18a<unrelated T extends core::Object? = dynamic> = (self::E18 /* = invalid-type */) → void;
 typedef Alias18b<contravariant T extends core::Object? = dynamic> = (T%) → void;
 typedef Alias20 = invalid-type;
 typedef Alias21 = core::int;
 typedef Alias22a = invalid-type;
 typedef Alias22b = core::int;
-typedef Alias23<T extends self::E23> = core::List<T>;
-typedef Alias24<T extends self::E24<T> = self::E24<dynamic>> = core::List<T>;
+typedef Alias23<T extends self::E23 /* = invalid-type */> = core::List<T>;
+typedef Alias24<T extends self::E24<T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */> = core::List<T>;
 extension type E1(invalid-type it) {
   constructor • = self::E1|;
   tearoff • = self::E1|_#new#tearOff;
@@ -303,7 +303,7 @@ extension type E18(invalid-type it) {
   constructor • = self::E18|;
   tearoff • = self::E18|_#new#tearOff;
 }
-extension type E19a((self::E19b, self::E19b) it) {
+extension type E19a((self::E19b /* = core::int */, self::E19b /* = core::int */) it) {
   constructor • = self::E19a|;
   tearoff • = self::E19a|_#new#tearOff;
 }
@@ -331,173 +331,173 @@ extension type E24<T extends core::Object? = dynamic>(invalid-type it) {
   constructor • = self::E24|;
   tearoff • = self::E24|_#new#tearOff;
 }
-static inline-class-member method E1|(dynamic it) → self::E1
+static inline-class-member method E1|(dynamic it) → self::E1 /* = invalid-type */
   ;
-static inline-class-member method E1|_#new#tearOff(dynamic it) → self::E1
+static inline-class-member method E1|_#new#tearOff(dynamic it) → self::E1 /* = invalid-type */
   return self::E1|(it);
-static inline-class-member method E2a|(dynamic it) → self::E2a
+static inline-class-member method E2a|(dynamic it) → self::E2a /* = invalid-type */
   ;
-static inline-class-member method E2a|_#new#tearOff(dynamic it) → self::E2a
+static inline-class-member method E2a|_#new#tearOff(dynamic it) → self::E2a /* = invalid-type */
   return self::E2a|(it);
-static inline-class-member method E2b|(dynamic it) → self::E2b
+static inline-class-member method E2b|(dynamic it) → self::E2b /* = invalid-type */
   ;
-static inline-class-member method E2b|_#new#tearOff(dynamic it) → self::E2b
+static inline-class-member method E2b|_#new#tearOff(dynamic it) → self::E2b /* = invalid-type */
   return self::E2b|(it);
-static inline-class-member method E3a|(dynamic it) → self::E3a
+static inline-class-member method E3a|(dynamic it) → self::E3a /* = invalid-type */
   ;
-static inline-class-member method E3a|_#new#tearOff(dynamic it) → self::E3a
+static inline-class-member method E3a|_#new#tearOff(dynamic it) → self::E3a /* = invalid-type */
   return self::E3a|(it);
-static inline-class-member method E3b|(dynamic it) → self::E3b
+static inline-class-member method E3b|(dynamic it) → self::E3b /* = invalid-type */
   ;
-static inline-class-member method E3b|_#new#tearOff(dynamic it) → self::E3b
+static inline-class-member method E3b|_#new#tearOff(dynamic it) → self::E3b /* = invalid-type */
   return self::E3b|(it);
-static inline-class-member method E3c|(dynamic it) → self::E3c
+static inline-class-member method E3c|(dynamic it) → self::E3c /* = invalid-type */
   ;
-static inline-class-member method E3c|_#new#tearOff(dynamic it) → self::E3c
+static inline-class-member method E3c|_#new#tearOff(dynamic it) → self::E3c /* = invalid-type */
   return self::E3c|(it);
-static inline-class-member method E4|(dynamic it) → self::E4
+static inline-class-member method E4|(dynamic it) → self::E4 /* = invalid-type */
   ;
-static inline-class-member method E4|_#new#tearOff(dynamic it) → self::E4
+static inline-class-member method E4|_#new#tearOff(dynamic it) → self::E4 /* = invalid-type */
   return self::E4|(it);
-static inline-class-member method E5|(dynamic it) → self::E5
+static inline-class-member method E5|(dynamic it) → self::E5 /* = invalid-type */
   ;
-static inline-class-member method E5|_#new#tearOff(dynamic it) → self::E5
+static inline-class-member method E5|_#new#tearOff(dynamic it) → self::E5 /* = invalid-type */
   return self::E5|(it);
-static inline-class-member method E6|(dynamic it) → self::E6
+static inline-class-member method E6|(dynamic it) → self::E6 /* = invalid-type */
   ;
-static inline-class-member method E6|_#new#tearOff(dynamic it) → self::E6
+static inline-class-member method E6|_#new#tearOff(dynamic it) → self::E6 /* = invalid-type */
   return self::E6|(it);
-static inline-class-member method E7|_#new#tearOff(dynamic it) → self::E7
+static inline-class-member method E7|_#new#tearOff(dynamic it) → self::E7 /* = invalid-type */
   return self::E7|(it);
-static inline-class-member method E7|(dynamic it) → self::E7
+static inline-class-member method E7|(dynamic it) → self::E7 /* = invalid-type */
   ;
-static inline-class-member method E8|<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|::T%>
+static inline-class-member method E8|<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|::T%> /* = invalid-type */
   ;
-static inline-class-member method E8|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|_#new#tearOff::T%>
+static inline-class-member method E8|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|_#new#tearOff::T%> /* = invalid-type */
   return self::E8|<self::E8|_#new#tearOff::T%>(it);
-static inline-class-member method E9|(dynamic it) → self::E9
+static inline-class-member method E9|(dynamic it) → self::E9 /* = invalid-type */
   ;
-static inline-class-member method E9|_#new#tearOff(dynamic it) → self::E9
+static inline-class-member method E9|_#new#tearOff(dynamic it) → self::E9 /* = invalid-type */
   return self::E9|(it);
-static inline-class-member method E10|<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|::T%>
+static inline-class-member method E10|<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|::T%> /* = invalid-type */
   ;
-static inline-class-member method E10|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|_#new#tearOff::T%>
+static inline-class-member method E10|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|_#new#tearOff::T%> /* = invalid-type */
   return self::E10|<self::E10|_#new#tearOff::T%>(it);
-static inline-class-member method E11|(dynamic it) → self::E11
+static inline-class-member method E11|(dynamic it) → self::E11 /* = invalid-type */
   ;
-static inline-class-member method E11|_#new#tearOff(dynamic it) → self::E11
+static inline-class-member method E11|_#new#tearOff(dynamic it) → self::E11 /* = invalid-type */
   return self::E11|(it);
-static inline-class-member method E12|(dynamic it) → self::E12
+static inline-class-member method E12|(dynamic it) → self::E12 /* = invalid-type */
   ;
-static inline-class-member method E12|_#new#tearOff(dynamic it) → self::E12
+static inline-class-member method E12|_#new#tearOff(dynamic it) → self::E12 /* = invalid-type */
   return self::E12|(it);
-static inline-class-member method E13|(dynamic it) → self::E13
+static inline-class-member method E13|(dynamic it) → self::E13 /* = invalid-type */
   ;
-static inline-class-member method E13|_#new#tearOff(dynamic it) → self::E13
+static inline-class-member method E13|_#new#tearOff(dynamic it) → self::E13 /* = invalid-type */
   return self::E13|(it);
-static inline-class-member method E14|(dynamic it) → self::E14
+static inline-class-member method E14|(dynamic it) → self::E14 /* = core::int */
   ;
-static inline-class-member method E14|_#new#tearOff(dynamic it) → self::E14
+static inline-class-member method E14|_#new#tearOff(dynamic it) → self::E14 /* = core::int */
   return self::E14|(it);
-static inline-class-member method E15a|(dynamic it) → self::E15a
+static inline-class-member method E15a|(dynamic it) → self::E15a /* = invalid-type */
   ;
-static inline-class-member method E15a|_#new#tearOff(dynamic it) → self::E15a
+static inline-class-member method E15a|_#new#tearOff(dynamic it) → self::E15a /* = invalid-type */
   return self::E15a|(it);
-static inline-class-member method E15b|(dynamic it) → self::E15b
+static inline-class-member method E15b|(dynamic it) → self::E15b /* = invalid-type */
   ;
-static inline-class-member method E15b|_#new#tearOff(dynamic it) → self::E15b
+static inline-class-member method E15b|_#new#tearOff(dynamic it) → self::E15b /* = invalid-type */
   return self::E15b|(it);
-static inline-class-member method E16a|(dynamic it) → self::E16a
+static inline-class-member method E16a|(dynamic it) → self::E16a /* = invalid-type */
   ;
-static inline-class-member method E16a|_#new#tearOff(dynamic it) → self::E16a
+static inline-class-member method E16a|_#new#tearOff(dynamic it) → self::E16a /* = invalid-type */
   return self::E16a|(it);
-static inline-class-member method E16b|(dynamic it) → self::E16b
+static inline-class-member method E16b|(dynamic it) → self::E16b /* = invalid-type */
   ;
-static inline-class-member method E16b|_#new#tearOff(dynamic it) → self::E16b
+static inline-class-member method E16b|_#new#tearOff(dynamic it) → self::E16b /* = invalid-type */
   return self::E16b|(it);
-static inline-class-member method E17|(dynamic it) → self::E17
+static inline-class-member method E17|(dynamic it) → self::E17 /* = invalid-type */
   ;
-static inline-class-member method E17|_#new#tearOff(dynamic it) → self::E17
+static inline-class-member method E17|_#new#tearOff(dynamic it) → self::E17 /* = invalid-type */
   return self::E17|(it);
-static inline-class-member method E18|(dynamic it) → self::E18
+static inline-class-member method E18|(dynamic it) → self::E18 /* = invalid-type */
   ;
-static inline-class-member method E18|_#new#tearOff(dynamic it) → self::E18
+static inline-class-member method E18|_#new#tearOff(dynamic it) → self::E18 /* = invalid-type */
   return self::E18|(it);
-static inline-class-member method E19a|(dynamic it) → self::E19a
+static inline-class-member method E19a|(dynamic it) → self::E19a /* =(self::E19b /* = core::int */, self::E19b /* = core::int */) */
   ;
-static inline-class-member method E19a|_#new#tearOff(dynamic it) → self::E19a
+static inline-class-member method E19a|_#new#tearOff(dynamic it) → self::E19a /* =(self::E19b /* = core::int */, self::E19b /* = core::int */) */
   return self::E19a|(it);
-static inline-class-member method E19b|(dynamic it) → self::E19b
+static inline-class-member method E19b|(dynamic it) → self::E19b /* = core::int */
   ;
-static inline-class-member method E19b|_#new#tearOff(dynamic it) → self::E19b
+static inline-class-member method E19b|_#new#tearOff(dynamic it) → self::E19b /* = core::int */
   return self::E19b|(it);
-static inline-class-member method E20|(dynamic it) → self::E20
+static inline-class-member method E20|(dynamic it) → self::E20 /* = invalid-type */
   ;
-static inline-class-member method E20|_#new#tearOff(dynamic it) → self::E20
+static inline-class-member method E20|_#new#tearOff(dynamic it) → self::E20 /* = invalid-type */
   return self::E20|(it);
-static inline-class-member method E21|(dynamic it) → self::E21
+static inline-class-member method E21|(dynamic it) → self::E21 /* = invalid-type */
   ;
-static inline-class-member method E21|_#new#tearOff(dynamic it) → self::E21
+static inline-class-member method E21|_#new#tearOff(dynamic it) → self::E21 /* = invalid-type */
   return self::E21|(it);
-static inline-class-member method E22|(dynamic it) → self::E22
+static inline-class-member method E22|(dynamic it) → self::E22 /* = invalid-type */
   ;
-static inline-class-member method E22|_#new#tearOff(dynamic it) → self::E22
+static inline-class-member method E22|_#new#tearOff(dynamic it) → self::E22 /* = invalid-type */
   return self::E22|(it);
-static inline-class-member method E23|(dynamic it) → self::E23
+static inline-class-member method E23|(dynamic it) → self::E23 /* = invalid-type */
   ;
-static inline-class-member method E23|_#new#tearOff(dynamic it) → self::E23
+static inline-class-member method E23|_#new#tearOff(dynamic it) → self::E23 /* = invalid-type */
   return self::E23|(it);
-static inline-class-member method E24|<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|::T%>
+static inline-class-member method E24|<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|::T%> /* = invalid-type */
   ;
-static inline-class-member method E24|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|_#new#tearOff::T%>
+static inline-class-member method E24|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|_#new#tearOff::T%> /* = invalid-type */
   return self::E24|<self::E24|_#new#tearOff::T%>(it);
 static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/integers_patch.dart */ _#Alias14#fromEnvironment#tearOff<unrelated T extends core::Object? = dynamic>(core::String name, {has-declared-initializer core::int defaultValue}) → core::int
   return core::int::fromEnvironment(name, defaultValue: defaultValue);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16b fill, {has-declared-initializer core::bool growable}) → core::List<self::E16b>
-  return core::List::filled<self::E16b>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#empty#tearOff<unrelated T extends core::Object? = dynamic>({has-declared-initializer core::bool growable}) → core::List<self::E16b>
-  return core::List::empty<self::E16b>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {has-declared-initializer core::bool growable}) → core::List<self::E16b>
-  return core::List::from<self::E16b>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16b> elements, {has-declared-initializer core::bool growable}) → core::List<self::E16b>
-  return core::List::of<self::E16b>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16b generator, {has-declared-initializer core::bool growable}) → core::List<self::E16b>
-  return core::List::generate<self::E16b>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16b>
-  return core::List::unmodifiable<self::E16b>(elements);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16a fill, {has-declared-initializer core::bool growable}) → core::List<self::E16a>
-  return core::List::filled<self::E16a>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#empty#tearOff<unrelated T extends core::Object? = dynamic>({has-declared-initializer core::bool growable}) → core::List<self::E16a>
-  return core::List::empty<self::E16a>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {has-declared-initializer core::bool growable}) → core::List<self::E16a>
-  return core::List::from<self::E16a>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16a> elements, {has-declared-initializer core::bool growable}) → core::List<self::E16a>
-  return core::List::of<self::E16a>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16a generator, {has-declared-initializer core::bool growable}) → core::List<self::E16a>
-  return core::List::generate<self::E16a>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16a>
-  return core::List::unmodifiable<self::E16a>(elements);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#filled#tearOff<T extends self::E23>(core::int length, self::_#Alias23#filled#tearOff::T fill, {has-declared-initializer core::bool growable}) → core::List<self::_#Alias23#filled#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16b /* = invalid-type */ fill, {has-declared-initializer core::bool growable}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::filled<self::E16b /* = invalid-type */>(length, fill, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#empty#tearOff<unrelated T extends core::Object? = dynamic>({has-declared-initializer core::bool growable}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::empty<self::E16b /* = invalid-type */>(growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {has-declared-initializer core::bool growable}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::from<self::E16b /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16b /* = invalid-type */> elements, {has-declared-initializer core::bool growable}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::of<self::E16b /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16b /* = invalid-type */ generator, {has-declared-initializer core::bool growable}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::generate<self::E16b /* = invalid-type */>(length, generator, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16b /* = invalid-type */>
+  return core::List::unmodifiable<self::E16b /* = invalid-type */>(elements);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16a /* = invalid-type */ fill, {has-declared-initializer core::bool growable}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::filled<self::E16a /* = invalid-type */>(length, fill, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#empty#tearOff<unrelated T extends core::Object? = dynamic>({has-declared-initializer core::bool growable}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::empty<self::E16a /* = invalid-type */>(growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {has-declared-initializer core::bool growable}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::from<self::E16a /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16a /* = invalid-type */> elements, {has-declared-initializer core::bool growable}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::of<self::E16a /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16a /* = invalid-type */ generator, {has-declared-initializer core::bool growable}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::generate<self::E16a /* = invalid-type */>(length, generator, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16a /* = invalid-type */>
+  return core::List::unmodifiable<self::E16a /* = invalid-type */>(elements);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#filled#tearOff<T extends self::E23 /* = invalid-type */>(core::int length, self::_#Alias23#filled#tearOff::T fill, {has-declared-initializer core::bool growable}) → core::List<self::_#Alias23#filled#tearOff::T>
   return core::List::filled<self::_#Alias23#filled#tearOff::T>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#empty#tearOff<T extends self::E23>({has-declared-initializer core::bool growable}) → core::List<self::_#Alias23#empty#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#empty#tearOff<T extends self::E23 /* = invalid-type */>({has-declared-initializer core::bool growable}) → core::List<self::_#Alias23#empty#tearOff::T>
   return core::List::empty<self::_#Alias23#empty#tearOff::T>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#from#tearOff<T extends self::E23>(core::Iterable<dynamic> elements, {has-declared-initializer core::bool growable}) → core::List<self::_#Alias23#from#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#from#tearOff<T extends self::E23 /* = invalid-type */>(core::Iterable<dynamic> elements, {has-declared-initializer core::bool growable}) → core::List<self::_#Alias23#from#tearOff::T>
   return core::List::from<self::_#Alias23#from#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#of#tearOff<T extends self::E23>(core::Iterable<self::_#Alias23#of#tearOff::T> elements, {has-declared-initializer core::bool growable}) → core::List<self::_#Alias23#of#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#of#tearOff<T extends self::E23 /* = invalid-type */>(core::Iterable<self::_#Alias23#of#tearOff::T> elements, {has-declared-initializer core::bool growable}) → core::List<self::_#Alias23#of#tearOff::T>
   return core::List::of<self::_#Alias23#of#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#generate#tearOff<T extends self::E23>(core::int length, (core::int) → self::_#Alias23#generate#tearOff::T generator, {has-declared-initializer core::bool growable}) → core::List<self::_#Alias23#generate#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#generate#tearOff<T extends self::E23 /* = invalid-type */>(core::int length, (core::int) → self::_#Alias23#generate#tearOff::T generator, {has-declared-initializer core::bool growable}) → core::List<self::_#Alias23#generate#tearOff::T>
   return core::List::generate<self::_#Alias23#generate#tearOff::T>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#unmodifiable#tearOff<T extends self::E23>(core::Iterable<dynamic> elements) → core::List<self::_#Alias23#unmodifiable#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#unmodifiable#tearOff<T extends self::E23 /* = invalid-type */>(core::Iterable<dynamic> elements) → core::List<self::_#Alias23#unmodifiable#tearOff::T>
   return core::List::unmodifiable<self::_#Alias23#unmodifiable#tearOff::T>(elements);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#filled#tearOff<T extends self::E24<self::_#Alias24#filled#tearOff::T> = self::E24<dynamic>>(core::int length, self::_#Alias24#filled#tearOff::T fill, {has-declared-initializer core::bool growable}) → core::List<self::_#Alias24#filled#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#filled#tearOff<T extends self::E24<self::_#Alias24#filled#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::int length, self::_#Alias24#filled#tearOff::T fill, {has-declared-initializer core::bool growable}) → core::List<self::_#Alias24#filled#tearOff::T>
   return core::List::filled<self::_#Alias24#filled#tearOff::T>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#empty#tearOff<T extends self::E24<self::_#Alias24#empty#tearOff::T> = self::E24<dynamic>>({has-declared-initializer core::bool growable}) → core::List<self::_#Alias24#empty#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#empty#tearOff<T extends self::E24<self::_#Alias24#empty#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>({has-declared-initializer core::bool growable}) → core::List<self::_#Alias24#empty#tearOff::T>
   return core::List::empty<self::_#Alias24#empty#tearOff::T>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#from#tearOff<T extends self::E24<self::_#Alias24#from#tearOff::T> = self::E24<dynamic>>(core::Iterable<dynamic> elements, {has-declared-initializer core::bool growable}) → core::List<self::_#Alias24#from#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#from#tearOff<T extends self::E24<self::_#Alias24#from#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::Iterable<dynamic> elements, {has-declared-initializer core::bool growable}) → core::List<self::_#Alias24#from#tearOff::T>
   return core::List::from<self::_#Alias24#from#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#of#tearOff<T extends self::E24<self::_#Alias24#of#tearOff::T> = self::E24<dynamic>>(core::Iterable<self::_#Alias24#of#tearOff::T> elements, {has-declared-initializer core::bool growable}) → core::List<self::_#Alias24#of#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#of#tearOff<T extends self::E24<self::_#Alias24#of#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::Iterable<self::_#Alias24#of#tearOff::T> elements, {has-declared-initializer core::bool growable}) → core::List<self::_#Alias24#of#tearOff::T>
   return core::List::of<self::_#Alias24#of#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#generate#tearOff<T extends self::E24<self::_#Alias24#generate#tearOff::T> = self::E24<dynamic>>(core::int length, (core::int) → self::_#Alias24#generate#tearOff::T generator, {has-declared-initializer core::bool growable}) → core::List<self::_#Alias24#generate#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#generate#tearOff<T extends self::E24<self::_#Alias24#generate#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::int length, (core::int) → self::_#Alias24#generate#tearOff::T generator, {has-declared-initializer core::bool growable}) → core::List<self::_#Alias24#generate#tearOff::T>
   return core::List::generate<self::_#Alias24#generate#tearOff::T>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#unmodifiable#tearOff<T extends self::E24<self::_#Alias24#unmodifiable#tearOff::T> = self::E24<dynamic>>(core::Iterable<dynamic> elements) → core::List<self::_#Alias24#unmodifiable#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#unmodifiable#tearOff<T extends self::E24<self::_#Alias24#unmodifiable#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::Iterable<dynamic> elements) → core::List<self::_#Alias24#unmodifiable#tearOff::T>
   return core::List::unmodifiable<self::_#Alias24#unmodifiable#tearOff::T>(elements);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.weak.transformed.expect
index 9d381d2fe93..f5a49655b5c 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/cyclic_representation_type.dart.weak.transformed.expect
@@ -194,23 +194,23 @@ library;
 import self as self;
 import "dart:core" as core;
 
-typedef Alias9 = self::E9;
-typedef Alias10<unrelated T extends core::Object? = dynamic> = self::E10<T%>;
-typedef Alias11 = () → self::E11;
-typedef Alias12 = (self::E12) → void;
-typedef Alias13 = <T extends self::E13 = dynamic>() → void;
+typedef Alias9 = self::E9 /* = invalid-type */;
+typedef Alias10<unrelated T extends core::Object? = dynamic> = self::E10<T%> /* = invalid-type */;
+typedef Alias11 = () → self::E11 /* = invalid-type */;
+typedef Alias12 = (self::E12 /* = invalid-type */) → void;
+typedef Alias13 = <T extends self::E13 /* = invalid-type */ = dynamic>() → void;
 typedef Alias14<unrelated T extends core::Object? = dynamic> = core::int;
 typedef Alias15<T extends core::Object? = dynamic> = core::List<T%>;
-typedef Alias16a<unrelated T extends core::Object? = dynamic> = core::List<self::E16b>;
-typedef Alias16b<unrelated T extends core::Object? = dynamic> = core::List<self::E16a>;
-typedef Alias18a<unrelated T extends core::Object? = dynamic> = (self::E18) → void;
+typedef Alias16a<unrelated T extends core::Object? = dynamic> = core::List<self::E16b /* = invalid-type */>;
+typedef Alias16b<unrelated T extends core::Object? = dynamic> = core::List<self::E16a /* = invalid-type */>;
+typedef Alias18a<unrelated T extends core::Object? = dynamic> = (self::E18 /* = invalid-type */) → void;
 typedef Alias18b<contravariant T extends core::Object? = dynamic> = (T%) → void;
 typedef Alias20 = invalid-type;
 typedef Alias21 = core::int;
 typedef Alias22a = invalid-type;
 typedef Alias22b = core::int;
-typedef Alias23<T extends self::E23> = core::List<T>;
-typedef Alias24<T extends self::E24<T> = self::E24<dynamic>> = core::List<T>;
+typedef Alias23<T extends self::E23 /* = invalid-type */> = core::List<T>;
+typedef Alias24<T extends self::E24<T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */> = core::List<T>;
 extension type E1(invalid-type it) {
   constructor • = self::E1|;
   tearoff • = self::E1|_#new#tearOff;
@@ -303,7 +303,7 @@ extension type E18(invalid-type it) {
   constructor • = self::E18|;
   tearoff • = self::E18|_#new#tearOff;
 }
-extension type E19a((self::E19b, self::E19b) it) {
+extension type E19a((self::E19b /* = core::int */, self::E19b /* = core::int */) it) {
   constructor • = self::E19a|;
   tearoff • = self::E19a|_#new#tearOff;
 }
@@ -331,235 +331,235 @@ extension type E24<T extends core::Object? = dynamic>(invalid-type it) {
   constructor • = self::E24|;
   tearoff • = self::E24|_#new#tearOff;
 }
-static inline-class-member method E1|(dynamic it) → self::E1 {
-  lowered final self::E1 #this = it;
+static inline-class-member method E1|(dynamic it) → self::E1 /* = invalid-type */ {
+  lowered final self::E1 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E1|_#new#tearOff(dynamic it) → self::E1
+static inline-class-member method E1|_#new#tearOff(dynamic it) → self::E1 /* = invalid-type */
   return self::E1|(it);
-static inline-class-member method E2a|(dynamic it) → self::E2a {
-  lowered final self::E2a #this = it;
+static inline-class-member method E2a|(dynamic it) → self::E2a /* = invalid-type */ {
+  lowered final self::E2a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E2a|_#new#tearOff(dynamic it) → self::E2a
+static inline-class-member method E2a|_#new#tearOff(dynamic it) → self::E2a /* = invalid-type */
   return self::E2a|(it);
-static inline-class-member method E2b|(dynamic it) → self::E2b {
-  lowered final self::E2b #this = it;
+static inline-class-member method E2b|(dynamic it) → self::E2b /* = invalid-type */ {
+  lowered final self::E2b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E2b|_#new#tearOff(dynamic it) → self::E2b
+static inline-class-member method E2b|_#new#tearOff(dynamic it) → self::E2b /* = invalid-type */
   return self::E2b|(it);
-static inline-class-member method E3a|(dynamic it) → self::E3a {
-  lowered final self::E3a #this = it;
+static inline-class-member method E3a|(dynamic it) → self::E3a /* = invalid-type */ {
+  lowered final self::E3a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E3a|_#new#tearOff(dynamic it) → self::E3a
+static inline-class-member method E3a|_#new#tearOff(dynamic it) → self::E3a /* = invalid-type */
   return self::E3a|(it);
-static inline-class-member method E3b|(dynamic it) → self::E3b {
-  lowered final self::E3b #this = it;
+static inline-class-member method E3b|(dynamic it) → self::E3b /* = invalid-type */ {
+  lowered final self::E3b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E3b|_#new#tearOff(dynamic it) → self::E3b
+static inline-class-member method E3b|_#new#tearOff(dynamic it) → self::E3b /* = invalid-type */
   return self::E3b|(it);
-static inline-class-member method E3c|(dynamic it) → self::E3c {
-  lowered final self::E3c #this = it;
+static inline-class-member method E3c|(dynamic it) → self::E3c /* = invalid-type */ {
+  lowered final self::E3c /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E3c|_#new#tearOff(dynamic it) → self::E3c
+static inline-class-member method E3c|_#new#tearOff(dynamic it) → self::E3c /* = invalid-type */
   return self::E3c|(it);
-static inline-class-member method E4|(dynamic it) → self::E4 {
-  lowered final self::E4 #this = it;
+static inline-class-member method E4|(dynamic it) → self::E4 /* = invalid-type */ {
+  lowered final self::E4 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E4|_#new#tearOff(dynamic it) → self::E4
+static inline-class-member method E4|_#new#tearOff(dynamic it) → self::E4 /* = invalid-type */
   return self::E4|(it);
-static inline-class-member method E5|(dynamic it) → self::E5 {
-  lowered final self::E5 #this = it;
+static inline-class-member method E5|(dynamic it) → self::E5 /* = invalid-type */ {
+  lowered final self::E5 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E5|_#new#tearOff(dynamic it) → self::E5
+static inline-class-member method E5|_#new#tearOff(dynamic it) → self::E5 /* = invalid-type */
   return self::E5|(it);
-static inline-class-member method E6|(dynamic it) → self::E6 {
-  lowered final self::E6 #this = it;
+static inline-class-member method E6|(dynamic it) → self::E6 /* = invalid-type */ {
+  lowered final self::E6 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E6|_#new#tearOff(dynamic it) → self::E6
+static inline-class-member method E6|_#new#tearOff(dynamic it) → self::E6 /* = invalid-type */
   return self::E6|(it);
-static inline-class-member method E7|_#new#tearOff(dynamic it) → self::E7
+static inline-class-member method E7|_#new#tearOff(dynamic it) → self::E7 /* = invalid-type */
   return self::E7|(it);
-static inline-class-member method E7|(dynamic it) → self::E7 {
-  lowered final self::E7 #this = it;
+static inline-class-member method E7|(dynamic it) → self::E7 /* = invalid-type */ {
+  lowered final self::E7 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E8|<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|::T%> {
-  lowered final self::E8<self::E8|::T%> #this = it;
+static inline-class-member method E8|<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|::T%> /* = invalid-type */ {
+  lowered final self::E8<self::E8|::T%> /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E8|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|_#new#tearOff::T%>
+static inline-class-member method E8|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E8<self::E8|_#new#tearOff::T%> /* = invalid-type */
   return self::E8|<self::E8|_#new#tearOff::T%>(it);
-static inline-class-member method E9|(dynamic it) → self::E9 {
-  lowered final self::E9 #this = it;
+static inline-class-member method E9|(dynamic it) → self::E9 /* = invalid-type */ {
+  lowered final self::E9 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E9|_#new#tearOff(dynamic it) → self::E9
+static inline-class-member method E9|_#new#tearOff(dynamic it) → self::E9 /* = invalid-type */
   return self::E9|(it);
-static inline-class-member method E10|<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|::T%> {
-  lowered final self::E10<self::E10|::T%> #this = it;
+static inline-class-member method E10|<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|::T%> /* = invalid-type */ {
+  lowered final self::E10<self::E10|::T%> /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E10|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|_#new#tearOff::T%>
+static inline-class-member method E10|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E10<self::E10|_#new#tearOff::T%> /* = invalid-type */
   return self::E10|<self::E10|_#new#tearOff::T%>(it);
-static inline-class-member method E11|(dynamic it) → self::E11 {
-  lowered final self::E11 #this = it;
+static inline-class-member method E11|(dynamic it) → self::E11 /* = invalid-type */ {
+  lowered final self::E11 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E11|_#new#tearOff(dynamic it) → self::E11
+static inline-class-member method E11|_#new#tearOff(dynamic it) → self::E11 /* = invalid-type */
   return self::E11|(it);
-static inline-class-member method E12|(dynamic it) → self::E12 {
-  lowered final self::E12 #this = it;
+static inline-class-member method E12|(dynamic it) → self::E12 /* = invalid-type */ {
+  lowered final self::E12 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E12|_#new#tearOff(dynamic it) → self::E12
+static inline-class-member method E12|_#new#tearOff(dynamic it) → self::E12 /* = invalid-type */
   return self::E12|(it);
-static inline-class-member method E13|(dynamic it) → self::E13 {
-  lowered final self::E13 #this = it;
+static inline-class-member method E13|(dynamic it) → self::E13 /* = invalid-type */ {
+  lowered final self::E13 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E13|_#new#tearOff(dynamic it) → self::E13
+static inline-class-member method E13|_#new#tearOff(dynamic it) → self::E13 /* = invalid-type */
   return self::E13|(it);
-static inline-class-member method E14|(dynamic it) → self::E14 {
-  lowered final self::E14 #this = it;
+static inline-class-member method E14|(dynamic it) → self::E14 /* = core::int */ {
+  lowered final self::E14 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E14|_#new#tearOff(dynamic it) → self::E14
+static inline-class-member method E14|_#new#tearOff(dynamic it) → self::E14 /* = core::int */
   return self::E14|(it);
-static inline-class-member method E15a|(dynamic it) → self::E15a {
-  lowered final self::E15a #this = it;
+static inline-class-member method E15a|(dynamic it) → self::E15a /* = invalid-type */ {
+  lowered final self::E15a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E15a|_#new#tearOff(dynamic it) → self::E15a
+static inline-class-member method E15a|_#new#tearOff(dynamic it) → self::E15a /* = invalid-type */
   return self::E15a|(it);
-static inline-class-member method E15b|(dynamic it) → self::E15b {
-  lowered final self::E15b #this = it;
+static inline-class-member method E15b|(dynamic it) → self::E15b /* = invalid-type */ {
+  lowered final self::E15b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E15b|_#new#tearOff(dynamic it) → self::E15b
+static inline-class-member method E15b|_#new#tearOff(dynamic it) → self::E15b /* = invalid-type */
   return self::E15b|(it);
-static inline-class-member method E16a|(dynamic it) → self::E16a {
-  lowered final self::E16a #this = it;
+static inline-class-member method E16a|(dynamic it) → self::E16a /* = invalid-type */ {
+  lowered final self::E16a /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E16a|_#new#tearOff(dynamic it) → self::E16a
+static inline-class-member method E16a|_#new#tearOff(dynamic it) → self::E16a /* = invalid-type */
   return self::E16a|(it);
-static inline-class-member method E16b|(dynamic it) → self::E16b {
-  lowered final self::E16b #this = it;
+static inline-class-member method E16b|(dynamic it) → self::E16b /* = invalid-type */ {
+  lowered final self::E16b /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E16b|_#new#tearOff(dynamic it) → self::E16b
+static inline-class-member method E16b|_#new#tearOff(dynamic it) → self::E16b /* = invalid-type */
   return self::E16b|(it);
-static inline-class-member method E17|(dynamic it) → self::E17 {
-  lowered final self::E17 #this = it;
+static inline-class-member method E17|(dynamic it) → self::E17 /* = invalid-type */ {
+  lowered final self::E17 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E17|_#new#tearOff(dynamic it) → self::E17
+static inline-class-member method E17|_#new#tearOff(dynamic it) → self::E17 /* = invalid-type */
   return self::E17|(it);
-static inline-class-member method E18|(dynamic it) → self::E18 {
-  lowered final self::E18 #this = it;
+static inline-class-member method E18|(dynamic it) → self::E18 /* = invalid-type */ {
+  lowered final self::E18 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E18|_#new#tearOff(dynamic it) → self::E18
+static inline-class-member method E18|_#new#tearOff(dynamic it) → self::E18 /* = invalid-type */
   return self::E18|(it);
-static inline-class-member method E19a|(dynamic it) → self::E19a {
-  lowered final self::E19a #this = it;
+static inline-class-member method E19a|(dynamic it) → self::E19a /* =(self::E19b /* = core::int */, self::E19b /* = core::int */) */ {
+  lowered final self::E19a /* =(self::E19b /* = core::int */, self::E19b /* = core::int */) */ #this = it;
   return #this;
 }
-static inline-class-member method E19a|_#new#tearOff(dynamic it) → self::E19a
+static inline-class-member method E19a|_#new#tearOff(dynamic it) → self::E19a /* =(self::E19b /* = core::int */, self::E19b /* = core::int */) */
   return self::E19a|(it);
-static inline-class-member method E19b|(dynamic it) → self::E19b {
-  lowered final self::E19b #this = it;
+static inline-class-member method E19b|(dynamic it) → self::E19b /* = core::int */ {
+  lowered final self::E19b /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E19b|_#new#tearOff(dynamic it) → self::E19b
+static inline-class-member method E19b|_#new#tearOff(dynamic it) → self::E19b /* = core::int */
   return self::E19b|(it);
-static inline-class-member method E20|(dynamic it) → self::E20 {
-  lowered final self::E20 #this = it;
+static inline-class-member method E20|(dynamic it) → self::E20 /* = invalid-type */ {
+  lowered final self::E20 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E20|_#new#tearOff(dynamic it) → self::E20
+static inline-class-member method E20|_#new#tearOff(dynamic it) → self::E20 /* = invalid-type */
   return self::E20|(it);
-static inline-class-member method E21|(dynamic it) → self::E21 {
-  lowered final self::E21 #this = it;
+static inline-class-member method E21|(dynamic it) → self::E21 /* = invalid-type */ {
+  lowered final self::E21 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E21|_#new#tearOff(dynamic it) → self::E21
+static inline-class-member method E21|_#new#tearOff(dynamic it) → self::E21 /* = invalid-type */
   return self::E21|(it);
-static inline-class-member method E22|(dynamic it) → self::E22 {
-  lowered final self::E22 #this = it;
+static inline-class-member method E22|(dynamic it) → self::E22 /* = invalid-type */ {
+  lowered final self::E22 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E22|_#new#tearOff(dynamic it) → self::E22
+static inline-class-member method E22|_#new#tearOff(dynamic it) → self::E22 /* = invalid-type */
   return self::E22|(it);
-static inline-class-member method E23|(dynamic it) → self::E23 {
-  lowered final self::E23 #this = it;
+static inline-class-member method E23|(dynamic it) → self::E23 /* = invalid-type */ {
+  lowered final self::E23 /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E23|_#new#tearOff(dynamic it) → self::E23
+static inline-class-member method E23|_#new#tearOff(dynamic it) → self::E23 /* = invalid-type */
   return self::E23|(it);
-static inline-class-member method E24|<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|::T%> {
-  lowered final self::E24<self::E24|::T%> #this = it;
+static inline-class-member method E24|<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|::T%> /* = invalid-type */ {
+  lowered final self::E24<self::E24|::T%> /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method E24|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|_#new#tearOff::T%>
+static inline-class-member method E24|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::E24<self::E24|_#new#tearOff::T%> /* = invalid-type */
   return self::E24|<self::E24|_#new#tearOff::T%>(it);
 static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/integers_patch.dart */ _#Alias14#fromEnvironment#tearOff<unrelated T extends core::Object? = dynamic>(core::String name, {core::int defaultValue = #C1}) → core::int
   return core::int::fromEnvironment(name, defaultValue: defaultValue);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16b fill, {core::bool growable = #C2}) → core::List<self::E16b>
-  return core::List::filled<self::E16b>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16b>
-  return core::List::empty<self::E16b>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16b>
-  return core::List::from<self::E16b>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16b> elements, {core::bool growable = #C3}) → core::List<self::E16b>
-  return core::List::of<self::E16b>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16b generator, {core::bool growable = #C3}) → core::List<self::E16b>
-  return core::List::generate<self::E16b>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16b>
-  return core::List::unmodifiable<self::E16b>(elements);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16a fill, {core::bool growable = #C2}) → core::List<self::E16a>
-  return core::List::filled<self::E16a>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16a>
-  return core::List::empty<self::E16a>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16a>
-  return core::List::from<self::E16a>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16a> elements, {core::bool growable = #C3}) → core::List<self::E16a>
-  return core::List::of<self::E16a>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16a generator, {core::bool growable = #C3}) → core::List<self::E16a>
-  return core::List::generate<self::E16a>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16a>
-  return core::List::unmodifiable<self::E16a>(elements);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#filled#tearOff<T extends self::E23>(core::int length, self::_#Alias23#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias23#filled#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16b /* = invalid-type */ fill, {core::bool growable = #C2}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::filled<self::E16b /* = invalid-type */>(length, fill, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::empty<self::E16b /* = invalid-type */>(growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::from<self::E16b /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16b /* = invalid-type */> elements, {core::bool growable = #C3}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::of<self::E16b /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16b /* = invalid-type */ generator, {core::bool growable = #C3}) → core::List<self::E16b /* = invalid-type */>
+  return core::List::generate<self::E16b /* = invalid-type */>(length, generator, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16a#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16b /* = invalid-type */>
+  return core::List::unmodifiable<self::E16b /* = invalid-type */>(elements);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#filled#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, self::E16a /* = invalid-type */ fill, {core::bool growable = #C2}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::filled<self::E16a /* = invalid-type */>(length, fill, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#empty#tearOff<unrelated T extends core::Object? = dynamic>({core::bool growable = #C2}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::empty<self::E16a /* = invalid-type */>(growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#from#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::from<self::E16a /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#of#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<self::E16a /* = invalid-type */> elements, {core::bool growable = #C3}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::of<self::E16a /* = invalid-type */>(elements, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#generate#tearOff<unrelated T extends core::Object? = dynamic>(core::int length, (core::int) → self::E16a /* = invalid-type */ generator, {core::bool growable = #C3}) → core::List<self::E16a /* = invalid-type */>
+  return core::List::generate<self::E16a /* = invalid-type */>(length, generator, growable: growable);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias16b#unmodifiable#tearOff<unrelated T extends core::Object? = dynamic>(core::Iterable<dynamic> elements) → core::List<self::E16a /* = invalid-type */>
+  return core::List::unmodifiable<self::E16a /* = invalid-type */>(elements);
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#filled#tearOff<T extends self::E23 /* = invalid-type */>(core::int length, self::_#Alias23#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias23#filled#tearOff::T>
   return core::List::filled<self::_#Alias23#filled#tearOff::T>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#empty#tearOff<T extends self::E23>({core::bool growable = #C2}) → core::List<self::_#Alias23#empty#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#empty#tearOff<T extends self::E23 /* = invalid-type */>({core::bool growable = #C2}) → core::List<self::_#Alias23#empty#tearOff::T>
   return core::List::empty<self::_#Alias23#empty#tearOff::T>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#from#tearOff<T extends self::E23>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#from#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#from#tearOff<T extends self::E23 /* = invalid-type */>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#from#tearOff::T>
   return core::List::from<self::_#Alias23#from#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#of#tearOff<T extends self::E23>(core::Iterable<self::_#Alias23#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#of#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#of#tearOff<T extends self::E23 /* = invalid-type */>(core::Iterable<self::_#Alias23#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias23#of#tearOff::T>
   return core::List::of<self::_#Alias23#of#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#generate#tearOff<T extends self::E23>(core::int length, (core::int) → self::_#Alias23#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias23#generate#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#generate#tearOff<T extends self::E23 /* = invalid-type */>(core::int length, (core::int) → self::_#Alias23#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias23#generate#tearOff::T>
   return core::List::generate<self::_#Alias23#generate#tearOff::T>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#unmodifiable#tearOff<T extends self::E23>(core::Iterable<dynamic> elements) → core::List<self::_#Alias23#unmodifiable#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias23#unmodifiable#tearOff<T extends self::E23 /* = invalid-type */>(core::Iterable<dynamic> elements) → core::List<self::_#Alias23#unmodifiable#tearOff::T>
   return core::List::unmodifiable<self::_#Alias23#unmodifiable#tearOff::T>(elements);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#filled#tearOff<T extends self::E24<self::_#Alias24#filled#tearOff::T> = self::E24<dynamic>>(core::int length, self::_#Alias24#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias24#filled#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#filled#tearOff<T extends self::E24<self::_#Alias24#filled#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::int length, self::_#Alias24#filled#tearOff::T fill, {core::bool growable = #C2}) → core::List<self::_#Alias24#filled#tearOff::T>
   return core::List::filled<self::_#Alias24#filled#tearOff::T>(length, fill, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#empty#tearOff<T extends self::E24<self::_#Alias24#empty#tearOff::T> = self::E24<dynamic>>({core::bool growable = #C2}) → core::List<self::_#Alias24#empty#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#empty#tearOff<T extends self::E24<self::_#Alias24#empty#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>({core::bool growable = #C2}) → core::List<self::_#Alias24#empty#tearOff::T>
   return core::List::empty<self::_#Alias24#empty#tearOff::T>(growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#from#tearOff<T extends self::E24<self::_#Alias24#from#tearOff::T> = self::E24<dynamic>>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#from#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#from#tearOff<T extends self::E24<self::_#Alias24#from#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::Iterable<dynamic> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#from#tearOff::T>
   return core::List::from<self::_#Alias24#from#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#of#tearOff<T extends self::E24<self::_#Alias24#of#tearOff::T> = self::E24<dynamic>>(core::Iterable<self::_#Alias24#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#of#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#of#tearOff<T extends self::E24<self::_#Alias24#of#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::Iterable<self::_#Alias24#of#tearOff::T> elements, {core::bool growable = #C3}) → core::List<self::_#Alias24#of#tearOff::T>
   return core::List::of<self::_#Alias24#of#tearOff::T>(elements, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#generate#tearOff<T extends self::E24<self::_#Alias24#generate#tearOff::T> = self::E24<dynamic>>(core::int length, (core::int) → self::_#Alias24#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias24#generate#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#generate#tearOff<T extends self::E24<self::_#Alias24#generate#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::int length, (core::int) → self::_#Alias24#generate#tearOff::T generator, {core::bool growable = #C3}) → core::List<self::_#Alias24#generate#tearOff::T>
   return core::List::generate<self::_#Alias24#generate#tearOff::T>(length, generator, growable: growable);
-static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#unmodifiable#tearOff<T extends self::E24<self::_#Alias24#unmodifiable#tearOff::T> = self::E24<dynamic>>(core::Iterable<dynamic> elements) → core::List<self::_#Alias24#unmodifiable#tearOff::T>
+static method /* from org-dartlang-sdk:///sdk/lib/_internal/vm_shared/lib/array_patch.dart */ _#Alias24#unmodifiable#tearOff<T extends self::E24<self::_#Alias24#unmodifiable#tearOff::T> /* = invalid-type */ = self::E24<dynamic> /* = invalid-type */>(core::Iterable<dynamic> elements) → core::List<self::_#Alias24#unmodifiable#tearOff::T>
   return core::List::unmodifiable<self::_#Alias24#unmodifiable#tearOff::T>(elements);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.strong.expect
index 47eccebb1dc..9f84a45d8be 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.strong.expect
@@ -6,7 +6,7 @@ extension type ExtensionType1(core::int it) {
   constructor • = self::ExtensionType1|;
   tearoff • = self::ExtensionType1|_#new#tearOff;
 }
-extension type ExtensionType2(core::int it) implements self::ExtensionType1, core::int {
+extension type ExtensionType2(core::int it) implements self::ExtensionType1 /* = core::int */, core::int {
   constructor • = self::ExtensionType2|;
   tearoff • = self::ExtensionType2|_#new#tearOff;
 }
@@ -49,81 +49,81 @@ extension type ExtensionType7<T extends core::num>(core::int it) {
   tearoff id = self::ExtensionType7|_#id#tearOff;
 }
 static field core::int ExtensionType4|staticField = 42;
-static inline-class-member method ExtensionType1|(dynamic it) → self::ExtensionType1 {
-  lowered final self::ExtensionType1 #this = it;
+static inline-class-member method ExtensionType1|(dynamic it) → self::ExtensionType1 /* = core::int */ {
+  lowered final self::ExtensionType1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType1|_#new#tearOff(dynamic it) → self::ExtensionType1
+static inline-class-member method ExtensionType1|_#new#tearOff(dynamic it) → self::ExtensionType1 /* = core::int */
   return self::ExtensionType1|(it);
-static inline-class-member method ExtensionType2|(dynamic it) → self::ExtensionType2 {
-  lowered final self::ExtensionType2 #this = it;
+static inline-class-member method ExtensionType2|(dynamic it) → self::ExtensionType2 /* = core::int */ {
+  lowered final self::ExtensionType2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType2|_#new#tearOff(dynamic it) → self::ExtensionType2
+static inline-class-member method ExtensionType2|_#new#tearOff(dynamic it) → self::ExtensionType2 /* = core::int */
   return self::ExtensionType2|(it);
-static inline-class-member method ExtensionType3|<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|::T> {
-  lowered final self::ExtensionType3<self::ExtensionType3|::T> #this = it;
+static inline-class-member method ExtensionType3|<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|::T> /* = self::ExtensionType3|::T */ {
+  lowered final self::ExtensionType3<self::ExtensionType3|::T> /* = self::ExtensionType3|::T */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType3|_#new#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|_#new#tearOff::T>
+static inline-class-member method ExtensionType3|_#new#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|_#new#tearOff::T> /* = self::ExtensionType3|_#new#tearOff::T */
   return self::ExtensionType3|<self::ExtensionType3|_#new#tearOff::T>(it);
-static inline-class-member method ExtensionType4|(dynamic it) → self::ExtensionType4 {
-  lowered final self::ExtensionType4 #this = it;
+static inline-class-member method ExtensionType4|(dynamic it) → self::ExtensionType4 /* = core::int */ {
+  lowered final self::ExtensionType4 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType4|_#new#tearOff(dynamic it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#new#tearOff(dynamic it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|constructor(core::int it) → self::ExtensionType4 {
-  lowered final self::ExtensionType4 #this = it;
+static inline-class-member method ExtensionType4|constructor(core::int it) → self::ExtensionType4 /* = core::int */ {
+  lowered final self::ExtensionType4 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType4|_#constructor#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#constructor#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|constructor(it);
-static inline-class-member method ExtensionType4|redirect(core::int it) → self::ExtensionType4 {
-  lowered final self::ExtensionType4 #this;
+static inline-class-member method ExtensionType4|redirect(core::int it) → self::ExtensionType4 /* = core::int */ {
+  lowered final self::ExtensionType4 /* = core::int */ #this;
   #this = self::ExtensionType4|(it);
   return #this;
 }
-static inline-class-member method ExtensionType4|_#redirect#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#redirect#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|redirect(it);
-static inline-class-member method ExtensionType4|fact(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|fact(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|_#fact#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#fact#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|fact(it);
-static inline-class-member method ExtensionType4|redirectingFactory(core::int it) → self::ExtensionType4 /* redirection-target: self::ExtensionType4| */
+static inline-class-member method ExtensionType4|redirectingFactory(core::int it) → self::ExtensionType4 /* = core::int */ /* redirection-target: self::ExtensionType4| */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|_#redirectingFactory#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#redirectingFactory#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|get#getter(lowered final self::ExtensionType4 #this) → core::int
+static inline-class-member method ExtensionType4|get#getter(lowered final self::ExtensionType4 /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType4|set#setter(lowered final self::ExtensionType4 #this, core::int value) → void {}
-static inline-class-member method ExtensionType4|method(lowered final self::ExtensionType4 #this) → core::int
+static inline-class-member method ExtensionType4|set#setter(lowered final self::ExtensionType4 /* = core::int */ #this, core::int value) → void {}
+static inline-class-member method ExtensionType4|method(lowered final self::ExtensionType4 /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType4|get#method(lowered final self::ExtensionType4 #this) → () → core::int
+static inline-class-member method ExtensionType4|get#method(lowered final self::ExtensionType4 /* = core::int */ #this) → () → core::int
   return () → core::int => self::ExtensionType4|method(#this);
-static inline-class-member method ExtensionType4|[](lowered final self::ExtensionType4 #this, core::int index) → core::int
+static inline-class-member method ExtensionType4|[](lowered final self::ExtensionType4 /* = core::int */ #this, core::int index) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType4|[]=(lowered final self::ExtensionType4 #this, core::int index, core::int value) → void {}
+static inline-class-member method ExtensionType4|[]=(lowered final self::ExtensionType4 /* = core::int */ #this, core::int index, core::int value) → void {}
 static inline-class-member get ExtensionType4|staticGetter() → core::int
   return 42;
 static inline-class-member set ExtensionType4|staticSetter(core::int value) → void {}
 static inline-class-member method ExtensionType4|staticMethod() → core::int
   return 42;
-static inline-class-member method ExtensionType5|(dynamic it) → self::ExtensionType5 {
-  lowered final self::ExtensionType5 #this = it;
+static inline-class-member method ExtensionType5|(dynamic it) → self::ExtensionType5 /* = core::int */ {
+  lowered final self::ExtensionType5 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType5|_#new#tearOff(dynamic it) → self::ExtensionType5
+static inline-class-member method ExtensionType5|_#new#tearOff(dynamic it) → self::ExtensionType5 /* = core::int */
   return self::ExtensionType5|(it);
-static inline-class-member method ExtensionType6|id(dynamic it) → self::ExtensionType6 {
-  lowered final self::ExtensionType6 #this = it;
+static inline-class-member method ExtensionType6|id(dynamic it) → self::ExtensionType6 /* = core::int */ {
+  lowered final self::ExtensionType6 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType6|_#id#tearOff(dynamic it) → self::ExtensionType6
+static inline-class-member method ExtensionType6|_#id#tearOff(dynamic it) → self::ExtensionType6 /* = core::int */
   return self::ExtensionType6|id(it);
-static inline-class-member method ExtensionType7|id<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|id::T> {
-  lowered final self::ExtensionType7<self::ExtensionType7|id::T> #this = it;
+static inline-class-member method ExtensionType7|id<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|id::T> /* = core::int */ {
+  lowered final self::ExtensionType7<self::ExtensionType7|id::T> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType7|_#id#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|_#id#tearOff::T>
+static inline-class-member method ExtensionType7|_#id#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|_#id#tearOff::T> /* = core::int */
   return self::ExtensionType7|id<self::ExtensionType7|_#id#tearOff::T>(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.strong.transformed.expect
index 47eccebb1dc..9f84a45d8be 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.strong.transformed.expect
@@ -6,7 +6,7 @@ extension type ExtensionType1(core::int it) {
   constructor • = self::ExtensionType1|;
   tearoff • = self::ExtensionType1|_#new#tearOff;
 }
-extension type ExtensionType2(core::int it) implements self::ExtensionType1, core::int {
+extension type ExtensionType2(core::int it) implements self::ExtensionType1 /* = core::int */, core::int {
   constructor • = self::ExtensionType2|;
   tearoff • = self::ExtensionType2|_#new#tearOff;
 }
@@ -49,81 +49,81 @@ extension type ExtensionType7<T extends core::num>(core::int it) {
   tearoff id = self::ExtensionType7|_#id#tearOff;
 }
 static field core::int ExtensionType4|staticField = 42;
-static inline-class-member method ExtensionType1|(dynamic it) → self::ExtensionType1 {
-  lowered final self::ExtensionType1 #this = it;
+static inline-class-member method ExtensionType1|(dynamic it) → self::ExtensionType1 /* = core::int */ {
+  lowered final self::ExtensionType1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType1|_#new#tearOff(dynamic it) → self::ExtensionType1
+static inline-class-member method ExtensionType1|_#new#tearOff(dynamic it) → self::ExtensionType1 /* = core::int */
   return self::ExtensionType1|(it);
-static inline-class-member method ExtensionType2|(dynamic it) → self::ExtensionType2 {
-  lowered final self::ExtensionType2 #this = it;
+static inline-class-member method ExtensionType2|(dynamic it) → self::ExtensionType2 /* = core::int */ {
+  lowered final self::ExtensionType2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType2|_#new#tearOff(dynamic it) → self::ExtensionType2
+static inline-class-member method ExtensionType2|_#new#tearOff(dynamic it) → self::ExtensionType2 /* = core::int */
   return self::ExtensionType2|(it);
-static inline-class-member method ExtensionType3|<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|::T> {
-  lowered final self::ExtensionType3<self::ExtensionType3|::T> #this = it;
+static inline-class-member method ExtensionType3|<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|::T> /* = self::ExtensionType3|::T */ {
+  lowered final self::ExtensionType3<self::ExtensionType3|::T> /* = self::ExtensionType3|::T */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType3|_#new#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|_#new#tearOff::T>
+static inline-class-member method ExtensionType3|_#new#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|_#new#tearOff::T> /* = self::ExtensionType3|_#new#tearOff::T */
   return self::ExtensionType3|<self::ExtensionType3|_#new#tearOff::T>(it);
-static inline-class-member method ExtensionType4|(dynamic it) → self::ExtensionType4 {
-  lowered final self::ExtensionType4 #this = it;
+static inline-class-member method ExtensionType4|(dynamic it) → self::ExtensionType4 /* = core::int */ {
+  lowered final self::ExtensionType4 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType4|_#new#tearOff(dynamic it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#new#tearOff(dynamic it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|constructor(core::int it) → self::ExtensionType4 {
-  lowered final self::ExtensionType4 #this = it;
+static inline-class-member method ExtensionType4|constructor(core::int it) → self::ExtensionType4 /* = core::int */ {
+  lowered final self::ExtensionType4 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType4|_#constructor#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#constructor#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|constructor(it);
-static inline-class-member method ExtensionType4|redirect(core::int it) → self::ExtensionType4 {
-  lowered final self::ExtensionType4 #this;
+static inline-class-member method ExtensionType4|redirect(core::int it) → self::ExtensionType4 /* = core::int */ {
+  lowered final self::ExtensionType4 /* = core::int */ #this;
   #this = self::ExtensionType4|(it);
   return #this;
 }
-static inline-class-member method ExtensionType4|_#redirect#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#redirect#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|redirect(it);
-static inline-class-member method ExtensionType4|fact(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|fact(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|_#fact#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#fact#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|fact(it);
-static inline-class-member method ExtensionType4|redirectingFactory(core::int it) → self::ExtensionType4 /* redirection-target: self::ExtensionType4| */
+static inline-class-member method ExtensionType4|redirectingFactory(core::int it) → self::ExtensionType4 /* = core::int */ /* redirection-target: self::ExtensionType4| */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|_#redirectingFactory#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#redirectingFactory#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|get#getter(lowered final self::ExtensionType4 #this) → core::int
+static inline-class-member method ExtensionType4|get#getter(lowered final self::ExtensionType4 /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType4|set#setter(lowered final self::ExtensionType4 #this, core::int value) → void {}
-static inline-class-member method ExtensionType4|method(lowered final self::ExtensionType4 #this) → core::int
+static inline-class-member method ExtensionType4|set#setter(lowered final self::ExtensionType4 /* = core::int */ #this, core::int value) → void {}
+static inline-class-member method ExtensionType4|method(lowered final self::ExtensionType4 /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType4|get#method(lowered final self::ExtensionType4 #this) → () → core::int
+static inline-class-member method ExtensionType4|get#method(lowered final self::ExtensionType4 /* = core::int */ #this) → () → core::int
   return () → core::int => self::ExtensionType4|method(#this);
-static inline-class-member method ExtensionType4|[](lowered final self::ExtensionType4 #this, core::int index) → core::int
+static inline-class-member method ExtensionType4|[](lowered final self::ExtensionType4 /* = core::int */ #this, core::int index) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType4|[]=(lowered final self::ExtensionType4 #this, core::int index, core::int value) → void {}
+static inline-class-member method ExtensionType4|[]=(lowered final self::ExtensionType4 /* = core::int */ #this, core::int index, core::int value) → void {}
 static inline-class-member get ExtensionType4|staticGetter() → core::int
   return 42;
 static inline-class-member set ExtensionType4|staticSetter(core::int value) → void {}
 static inline-class-member method ExtensionType4|staticMethod() → core::int
   return 42;
-static inline-class-member method ExtensionType5|(dynamic it) → self::ExtensionType5 {
-  lowered final self::ExtensionType5 #this = it;
+static inline-class-member method ExtensionType5|(dynamic it) → self::ExtensionType5 /* = core::int */ {
+  lowered final self::ExtensionType5 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType5|_#new#tearOff(dynamic it) → self::ExtensionType5
+static inline-class-member method ExtensionType5|_#new#tearOff(dynamic it) → self::ExtensionType5 /* = core::int */
   return self::ExtensionType5|(it);
-static inline-class-member method ExtensionType6|id(dynamic it) → self::ExtensionType6 {
-  lowered final self::ExtensionType6 #this = it;
+static inline-class-member method ExtensionType6|id(dynamic it) → self::ExtensionType6 /* = core::int */ {
+  lowered final self::ExtensionType6 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType6|_#id#tearOff(dynamic it) → self::ExtensionType6
+static inline-class-member method ExtensionType6|_#id#tearOff(dynamic it) → self::ExtensionType6 /* = core::int */
   return self::ExtensionType6|id(it);
-static inline-class-member method ExtensionType7|id<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|id::T> {
-  lowered final self::ExtensionType7<self::ExtensionType7|id::T> #this = it;
+static inline-class-member method ExtensionType7|id<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|id::T> /* = core::int */ {
+  lowered final self::ExtensionType7<self::ExtensionType7|id::T> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType7|_#id#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|_#id#tearOff::T>
+static inline-class-member method ExtensionType7|_#id#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|_#id#tearOff::T> /* = core::int */
   return self::ExtensionType7|id<self::ExtensionType7|_#id#tearOff::T>(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.weak.expect
index 47eccebb1dc..9f84a45d8be 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.weak.expect
@@ -6,7 +6,7 @@ extension type ExtensionType1(core::int it) {
   constructor • = self::ExtensionType1|;
   tearoff • = self::ExtensionType1|_#new#tearOff;
 }
-extension type ExtensionType2(core::int it) implements self::ExtensionType1, core::int {
+extension type ExtensionType2(core::int it) implements self::ExtensionType1 /* = core::int */, core::int {
   constructor • = self::ExtensionType2|;
   tearoff • = self::ExtensionType2|_#new#tearOff;
 }
@@ -49,81 +49,81 @@ extension type ExtensionType7<T extends core::num>(core::int it) {
   tearoff id = self::ExtensionType7|_#id#tearOff;
 }
 static field core::int ExtensionType4|staticField = 42;
-static inline-class-member method ExtensionType1|(dynamic it) → self::ExtensionType1 {
-  lowered final self::ExtensionType1 #this = it;
+static inline-class-member method ExtensionType1|(dynamic it) → self::ExtensionType1 /* = core::int */ {
+  lowered final self::ExtensionType1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType1|_#new#tearOff(dynamic it) → self::ExtensionType1
+static inline-class-member method ExtensionType1|_#new#tearOff(dynamic it) → self::ExtensionType1 /* = core::int */
   return self::ExtensionType1|(it);
-static inline-class-member method ExtensionType2|(dynamic it) → self::ExtensionType2 {
-  lowered final self::ExtensionType2 #this = it;
+static inline-class-member method ExtensionType2|(dynamic it) → self::ExtensionType2 /* = core::int */ {
+  lowered final self::ExtensionType2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType2|_#new#tearOff(dynamic it) → self::ExtensionType2
+static inline-class-member method ExtensionType2|_#new#tearOff(dynamic it) → self::ExtensionType2 /* = core::int */
   return self::ExtensionType2|(it);
-static inline-class-member method ExtensionType3|<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|::T> {
-  lowered final self::ExtensionType3<self::ExtensionType3|::T> #this = it;
+static inline-class-member method ExtensionType3|<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|::T> /* = self::ExtensionType3|::T */ {
+  lowered final self::ExtensionType3<self::ExtensionType3|::T> /* = self::ExtensionType3|::T */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType3|_#new#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|_#new#tearOff::T>
+static inline-class-member method ExtensionType3|_#new#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|_#new#tearOff::T> /* = self::ExtensionType3|_#new#tearOff::T */
   return self::ExtensionType3|<self::ExtensionType3|_#new#tearOff::T>(it);
-static inline-class-member method ExtensionType4|(dynamic it) → self::ExtensionType4 {
-  lowered final self::ExtensionType4 #this = it;
+static inline-class-member method ExtensionType4|(dynamic it) → self::ExtensionType4 /* = core::int */ {
+  lowered final self::ExtensionType4 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType4|_#new#tearOff(dynamic it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#new#tearOff(dynamic it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|constructor(core::int it) → self::ExtensionType4 {
-  lowered final self::ExtensionType4 #this = it;
+static inline-class-member method ExtensionType4|constructor(core::int it) → self::ExtensionType4 /* = core::int */ {
+  lowered final self::ExtensionType4 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType4|_#constructor#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#constructor#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|constructor(it);
-static inline-class-member method ExtensionType4|redirect(core::int it) → self::ExtensionType4 {
-  lowered final self::ExtensionType4 #this;
+static inline-class-member method ExtensionType4|redirect(core::int it) → self::ExtensionType4 /* = core::int */ {
+  lowered final self::ExtensionType4 /* = core::int */ #this;
   #this = self::ExtensionType4|(it);
   return #this;
 }
-static inline-class-member method ExtensionType4|_#redirect#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#redirect#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|redirect(it);
-static inline-class-member method ExtensionType4|fact(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|fact(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|_#fact#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#fact#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|fact(it);
-static inline-class-member method ExtensionType4|redirectingFactory(core::int it) → self::ExtensionType4 /* redirection-target: self::ExtensionType4| */
+static inline-class-member method ExtensionType4|redirectingFactory(core::int it) → self::ExtensionType4 /* = core::int */ /* redirection-target: self::ExtensionType4| */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|_#redirectingFactory#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#redirectingFactory#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|get#getter(lowered final self::ExtensionType4 #this) → core::int
+static inline-class-member method ExtensionType4|get#getter(lowered final self::ExtensionType4 /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType4|set#setter(lowered final self::ExtensionType4 #this, core::int value) → void {}
-static inline-class-member method ExtensionType4|method(lowered final self::ExtensionType4 #this) → core::int
+static inline-class-member method ExtensionType4|set#setter(lowered final self::ExtensionType4 /* = core::int */ #this, core::int value) → void {}
+static inline-class-member method ExtensionType4|method(lowered final self::ExtensionType4 /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType4|get#method(lowered final self::ExtensionType4 #this) → () → core::int
+static inline-class-member method ExtensionType4|get#method(lowered final self::ExtensionType4 /* = core::int */ #this) → () → core::int
   return () → core::int => self::ExtensionType4|method(#this);
-static inline-class-member method ExtensionType4|[](lowered final self::ExtensionType4 #this, core::int index) → core::int
+static inline-class-member method ExtensionType4|[](lowered final self::ExtensionType4 /* = core::int */ #this, core::int index) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType4|[]=(lowered final self::ExtensionType4 #this, core::int index, core::int value) → void {}
+static inline-class-member method ExtensionType4|[]=(lowered final self::ExtensionType4 /* = core::int */ #this, core::int index, core::int value) → void {}
 static inline-class-member get ExtensionType4|staticGetter() → core::int
   return 42;
 static inline-class-member set ExtensionType4|staticSetter(core::int value) → void {}
 static inline-class-member method ExtensionType4|staticMethod() → core::int
   return 42;
-static inline-class-member method ExtensionType5|(dynamic it) → self::ExtensionType5 {
-  lowered final self::ExtensionType5 #this = it;
+static inline-class-member method ExtensionType5|(dynamic it) → self::ExtensionType5 /* = core::int */ {
+  lowered final self::ExtensionType5 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType5|_#new#tearOff(dynamic it) → self::ExtensionType5
+static inline-class-member method ExtensionType5|_#new#tearOff(dynamic it) → self::ExtensionType5 /* = core::int */
   return self::ExtensionType5|(it);
-static inline-class-member method ExtensionType6|id(dynamic it) → self::ExtensionType6 {
-  lowered final self::ExtensionType6 #this = it;
+static inline-class-member method ExtensionType6|id(dynamic it) → self::ExtensionType6 /* = core::int */ {
+  lowered final self::ExtensionType6 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType6|_#id#tearOff(dynamic it) → self::ExtensionType6
+static inline-class-member method ExtensionType6|_#id#tearOff(dynamic it) → self::ExtensionType6 /* = core::int */
   return self::ExtensionType6|id(it);
-static inline-class-member method ExtensionType7|id<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|id::T> {
-  lowered final self::ExtensionType7<self::ExtensionType7|id::T> #this = it;
+static inline-class-member method ExtensionType7|id<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|id::T> /* = core::int */ {
+  lowered final self::ExtensionType7<self::ExtensionType7|id::T> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType7|_#id#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|_#id#tearOff::T>
+static inline-class-member method ExtensionType7|_#id#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|_#id#tearOff::T> /* = core::int */
   return self::ExtensionType7|id<self::ExtensionType7|_#id#tearOff::T>(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.weak.modular.expect
index 47eccebb1dc..9f84a45d8be 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.weak.modular.expect
@@ -6,7 +6,7 @@ extension type ExtensionType1(core::int it) {
   constructor • = self::ExtensionType1|;
   tearoff • = self::ExtensionType1|_#new#tearOff;
 }
-extension type ExtensionType2(core::int it) implements self::ExtensionType1, core::int {
+extension type ExtensionType2(core::int it) implements self::ExtensionType1 /* = core::int */, core::int {
   constructor • = self::ExtensionType2|;
   tearoff • = self::ExtensionType2|_#new#tearOff;
 }
@@ -49,81 +49,81 @@ extension type ExtensionType7<T extends core::num>(core::int it) {
   tearoff id = self::ExtensionType7|_#id#tearOff;
 }
 static field core::int ExtensionType4|staticField = 42;
-static inline-class-member method ExtensionType1|(dynamic it) → self::ExtensionType1 {
-  lowered final self::ExtensionType1 #this = it;
+static inline-class-member method ExtensionType1|(dynamic it) → self::ExtensionType1 /* = core::int */ {
+  lowered final self::ExtensionType1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType1|_#new#tearOff(dynamic it) → self::ExtensionType1
+static inline-class-member method ExtensionType1|_#new#tearOff(dynamic it) → self::ExtensionType1 /* = core::int */
   return self::ExtensionType1|(it);
-static inline-class-member method ExtensionType2|(dynamic it) → self::ExtensionType2 {
-  lowered final self::ExtensionType2 #this = it;
+static inline-class-member method ExtensionType2|(dynamic it) → self::ExtensionType2 /* = core::int */ {
+  lowered final self::ExtensionType2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType2|_#new#tearOff(dynamic it) → self::ExtensionType2
+static inline-class-member method ExtensionType2|_#new#tearOff(dynamic it) → self::ExtensionType2 /* = core::int */
   return self::ExtensionType2|(it);
-static inline-class-member method ExtensionType3|<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|::T> {
-  lowered final self::ExtensionType3<self::ExtensionType3|::T> #this = it;
+static inline-class-member method ExtensionType3|<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|::T> /* = self::ExtensionType3|::T */ {
+  lowered final self::ExtensionType3<self::ExtensionType3|::T> /* = self::ExtensionType3|::T */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType3|_#new#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|_#new#tearOff::T>
+static inline-class-member method ExtensionType3|_#new#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|_#new#tearOff::T> /* = self::ExtensionType3|_#new#tearOff::T */
   return self::ExtensionType3|<self::ExtensionType3|_#new#tearOff::T>(it);
-static inline-class-member method ExtensionType4|(dynamic it) → self::ExtensionType4 {
-  lowered final self::ExtensionType4 #this = it;
+static inline-class-member method ExtensionType4|(dynamic it) → self::ExtensionType4 /* = core::int */ {
+  lowered final self::ExtensionType4 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType4|_#new#tearOff(dynamic it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#new#tearOff(dynamic it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|constructor(core::int it) → self::ExtensionType4 {
-  lowered final self::ExtensionType4 #this = it;
+static inline-class-member method ExtensionType4|constructor(core::int it) → self::ExtensionType4 /* = core::int */ {
+  lowered final self::ExtensionType4 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType4|_#constructor#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#constructor#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|constructor(it);
-static inline-class-member method ExtensionType4|redirect(core::int it) → self::ExtensionType4 {
-  lowered final self::ExtensionType4 #this;
+static inline-class-member method ExtensionType4|redirect(core::int it) → self::ExtensionType4 /* = core::int */ {
+  lowered final self::ExtensionType4 /* = core::int */ #this;
   #this = self::ExtensionType4|(it);
   return #this;
 }
-static inline-class-member method ExtensionType4|_#redirect#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#redirect#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|redirect(it);
-static inline-class-member method ExtensionType4|fact(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|fact(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|_#fact#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#fact#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|fact(it);
-static inline-class-member method ExtensionType4|redirectingFactory(core::int it) → self::ExtensionType4 /* redirection-target: self::ExtensionType4| */
+static inline-class-member method ExtensionType4|redirectingFactory(core::int it) → self::ExtensionType4 /* = core::int */ /* redirection-target: self::ExtensionType4| */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|_#redirectingFactory#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#redirectingFactory#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|get#getter(lowered final self::ExtensionType4 #this) → core::int
+static inline-class-member method ExtensionType4|get#getter(lowered final self::ExtensionType4 /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType4|set#setter(lowered final self::ExtensionType4 #this, core::int value) → void {}
-static inline-class-member method ExtensionType4|method(lowered final self::ExtensionType4 #this) → core::int
+static inline-class-member method ExtensionType4|set#setter(lowered final self::ExtensionType4 /* = core::int */ #this, core::int value) → void {}
+static inline-class-member method ExtensionType4|method(lowered final self::ExtensionType4 /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType4|get#method(lowered final self::ExtensionType4 #this) → () → core::int
+static inline-class-member method ExtensionType4|get#method(lowered final self::ExtensionType4 /* = core::int */ #this) → () → core::int
   return () → core::int => self::ExtensionType4|method(#this);
-static inline-class-member method ExtensionType4|[](lowered final self::ExtensionType4 #this, core::int index) → core::int
+static inline-class-member method ExtensionType4|[](lowered final self::ExtensionType4 /* = core::int */ #this, core::int index) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType4|[]=(lowered final self::ExtensionType4 #this, core::int index, core::int value) → void {}
+static inline-class-member method ExtensionType4|[]=(lowered final self::ExtensionType4 /* = core::int */ #this, core::int index, core::int value) → void {}
 static inline-class-member get ExtensionType4|staticGetter() → core::int
   return 42;
 static inline-class-member set ExtensionType4|staticSetter(core::int value) → void {}
 static inline-class-member method ExtensionType4|staticMethod() → core::int
   return 42;
-static inline-class-member method ExtensionType5|(dynamic it) → self::ExtensionType5 {
-  lowered final self::ExtensionType5 #this = it;
+static inline-class-member method ExtensionType5|(dynamic it) → self::ExtensionType5 /* = core::int */ {
+  lowered final self::ExtensionType5 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType5|_#new#tearOff(dynamic it) → self::ExtensionType5
+static inline-class-member method ExtensionType5|_#new#tearOff(dynamic it) → self::ExtensionType5 /* = core::int */
   return self::ExtensionType5|(it);
-static inline-class-member method ExtensionType6|id(dynamic it) → self::ExtensionType6 {
-  lowered final self::ExtensionType6 #this = it;
+static inline-class-member method ExtensionType6|id(dynamic it) → self::ExtensionType6 /* = core::int */ {
+  lowered final self::ExtensionType6 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType6|_#id#tearOff(dynamic it) → self::ExtensionType6
+static inline-class-member method ExtensionType6|_#id#tearOff(dynamic it) → self::ExtensionType6 /* = core::int */
   return self::ExtensionType6|id(it);
-static inline-class-member method ExtensionType7|id<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|id::T> {
-  lowered final self::ExtensionType7<self::ExtensionType7|id::T> #this = it;
+static inline-class-member method ExtensionType7|id<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|id::T> /* = core::int */ {
+  lowered final self::ExtensionType7<self::ExtensionType7|id::T> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType7|_#id#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|_#id#tearOff::T>
+static inline-class-member method ExtensionType7|_#id#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|_#id#tearOff::T> /* = core::int */
   return self::ExtensionType7|id<self::ExtensionType7|_#id#tearOff::T>(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.weak.outline.expect
index f80ce4589a5..54c847cb380 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.weak.outline.expect
@@ -6,7 +6,7 @@ extension type ExtensionType1(core::int it) {
   constructor • = self::ExtensionType1|;
   tearoff • = self::ExtensionType1|_#new#tearOff;
 }
-extension type ExtensionType2(core::int it) implements self::ExtensionType1, core::int {
+extension type ExtensionType2(core::int it) implements self::ExtensionType1 /* = core::int */, core::int {
   constructor • = self::ExtensionType2|;
   tearoff • = self::ExtensionType2|_#new#tearOff;
 }
@@ -49,49 +49,49 @@ extension type ExtensionType7<T extends core::num>(core::int it) {
   tearoff id = self::ExtensionType7|_#id#tearOff;
 }
 static field core::int ExtensionType4|staticField;
-static inline-class-member method ExtensionType1|(dynamic it) → self::ExtensionType1
+static inline-class-member method ExtensionType1|(dynamic it) → self::ExtensionType1 /* = core::int */
   ;
-static inline-class-member method ExtensionType1|_#new#tearOff(dynamic it) → self::ExtensionType1
+static inline-class-member method ExtensionType1|_#new#tearOff(dynamic it) → self::ExtensionType1 /* = core::int */
   return self::ExtensionType1|(it);
-static inline-class-member method ExtensionType2|(dynamic it) → self::ExtensionType2
+static inline-class-member method ExtensionType2|(dynamic it) → self::ExtensionType2 /* = core::int */
   ;
-static inline-class-member method ExtensionType2|_#new#tearOff(dynamic it) → self::ExtensionType2
+static inline-class-member method ExtensionType2|_#new#tearOff(dynamic it) → self::ExtensionType2 /* = core::int */
   return self::ExtensionType2|(it);
-static inline-class-member method ExtensionType3|<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|::T>
+static inline-class-member method ExtensionType3|<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|::T> /* = self::ExtensionType3|::T */
   ;
-static inline-class-member method ExtensionType3|_#new#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|_#new#tearOff::T>
+static inline-class-member method ExtensionType3|_#new#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|_#new#tearOff::T> /* = self::ExtensionType3|_#new#tearOff::T */
   return self::ExtensionType3|<self::ExtensionType3|_#new#tearOff::T>(it);
-static inline-class-member method ExtensionType4|(dynamic it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|(dynamic it) → self::ExtensionType4 /* = core::int */
   ;
-static inline-class-member method ExtensionType4|_#new#tearOff(dynamic it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#new#tearOff(dynamic it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|constructor(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|constructor(core::int it) → self::ExtensionType4 /* = core::int */
   ;
-static inline-class-member method ExtensionType4|_#constructor#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#constructor#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|constructor(it);
-static inline-class-member method ExtensionType4|redirect(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|redirect(core::int it) → self::ExtensionType4 /* = core::int */
   ;
-static inline-class-member method ExtensionType4|_#redirect#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#redirect#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|redirect(it);
-static inline-class-member method ExtensionType4|fact(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|fact(core::int it) → self::ExtensionType4 /* = core::int */
   ;
-static inline-class-member method ExtensionType4|_#fact#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#fact#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|fact(it);
-static inline-class-member method ExtensionType4|redirectingFactory(core::int it) → self::ExtensionType4 /* redirection-target: self::ExtensionType4| */
+static inline-class-member method ExtensionType4|redirectingFactory(core::int it) → self::ExtensionType4 /* = core::int */ /* redirection-target: self::ExtensionType4| */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|_#redirectingFactory#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#redirectingFactory#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|get#getter(lowered final self::ExtensionType4 #this) → core::int
+static inline-class-member method ExtensionType4|get#getter(lowered final self::ExtensionType4 /* = core::int */ #this) → core::int
   ;
-static inline-class-member method ExtensionType4|set#setter(lowered final self::ExtensionType4 #this, core::int value) → void
+static inline-class-member method ExtensionType4|set#setter(lowered final self::ExtensionType4 /* = core::int */ #this, core::int value) → void
   ;
-static inline-class-member method ExtensionType4|method(lowered final self::ExtensionType4 #this) → core::int
+static inline-class-member method ExtensionType4|method(lowered final self::ExtensionType4 /* = core::int */ #this) → core::int
   ;
-static inline-class-member method ExtensionType4|get#method(lowered final self::ExtensionType4 #this) → () → core::int
+static inline-class-member method ExtensionType4|get#method(lowered final self::ExtensionType4 /* = core::int */ #this) → () → core::int
   return () → core::int => self::ExtensionType4|method(#this);
-static inline-class-member method ExtensionType4|[](lowered final self::ExtensionType4 #this, core::int index) → core::int
+static inline-class-member method ExtensionType4|[](lowered final self::ExtensionType4 /* = core::int */ #this, core::int index) → core::int
   ;
-static inline-class-member method ExtensionType4|[]=(lowered final self::ExtensionType4 #this, core::int index, core::int value) → void
+static inline-class-member method ExtensionType4|[]=(lowered final self::ExtensionType4 /* = core::int */ #this, core::int index, core::int value) → void
   ;
 static inline-class-member get ExtensionType4|staticGetter() → core::int
   ;
@@ -99,15 +99,15 @@ static inline-class-member set ExtensionType4|staticSetter(core::int value) →
   ;
 static inline-class-member method ExtensionType4|staticMethod() → core::int
   ;
-static inline-class-member method ExtensionType5|(dynamic it) → self::ExtensionType5
+static inline-class-member method ExtensionType5|(dynamic it) → self::ExtensionType5 /* = core::int */
   ;
-static inline-class-member method ExtensionType5|_#new#tearOff(dynamic it) → self::ExtensionType5
+static inline-class-member method ExtensionType5|_#new#tearOff(dynamic it) → self::ExtensionType5 /* = core::int */
   return self::ExtensionType5|(it);
-static inline-class-member method ExtensionType6|id(dynamic it) → self::ExtensionType6
+static inline-class-member method ExtensionType6|id(dynamic it) → self::ExtensionType6 /* = core::int */
   ;
-static inline-class-member method ExtensionType6|_#id#tearOff(dynamic it) → self::ExtensionType6
+static inline-class-member method ExtensionType6|_#id#tearOff(dynamic it) → self::ExtensionType6 /* = core::int */
   return self::ExtensionType6|id(it);
-static inline-class-member method ExtensionType7|id<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|id::T>
+static inline-class-member method ExtensionType7|id<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|id::T> /* = core::int */
   ;
-static inline-class-member method ExtensionType7|_#id#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|_#id#tearOff::T>
+static inline-class-member method ExtensionType7|_#id#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|_#id#tearOff::T> /* = core::int */
   return self::ExtensionType7|id<self::ExtensionType7|_#id#tearOff::T>(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.weak.transformed.expect
index 47eccebb1dc..9f84a45d8be 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/extension_type_declarations.dart.weak.transformed.expect
@@ -6,7 +6,7 @@ extension type ExtensionType1(core::int it) {
   constructor • = self::ExtensionType1|;
   tearoff • = self::ExtensionType1|_#new#tearOff;
 }
-extension type ExtensionType2(core::int it) implements self::ExtensionType1, core::int {
+extension type ExtensionType2(core::int it) implements self::ExtensionType1 /* = core::int */, core::int {
   constructor • = self::ExtensionType2|;
   tearoff • = self::ExtensionType2|_#new#tearOff;
 }
@@ -49,81 +49,81 @@ extension type ExtensionType7<T extends core::num>(core::int it) {
   tearoff id = self::ExtensionType7|_#id#tearOff;
 }
 static field core::int ExtensionType4|staticField = 42;
-static inline-class-member method ExtensionType1|(dynamic it) → self::ExtensionType1 {
-  lowered final self::ExtensionType1 #this = it;
+static inline-class-member method ExtensionType1|(dynamic it) → self::ExtensionType1 /* = core::int */ {
+  lowered final self::ExtensionType1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType1|_#new#tearOff(dynamic it) → self::ExtensionType1
+static inline-class-member method ExtensionType1|_#new#tearOff(dynamic it) → self::ExtensionType1 /* = core::int */
   return self::ExtensionType1|(it);
-static inline-class-member method ExtensionType2|(dynamic it) → self::ExtensionType2 {
-  lowered final self::ExtensionType2 #this = it;
+static inline-class-member method ExtensionType2|(dynamic it) → self::ExtensionType2 /* = core::int */ {
+  lowered final self::ExtensionType2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType2|_#new#tearOff(dynamic it) → self::ExtensionType2
+static inline-class-member method ExtensionType2|_#new#tearOff(dynamic it) → self::ExtensionType2 /* = core::int */
   return self::ExtensionType2|(it);
-static inline-class-member method ExtensionType3|<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|::T> {
-  lowered final self::ExtensionType3<self::ExtensionType3|::T> #this = it;
+static inline-class-member method ExtensionType3|<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|::T> /* = self::ExtensionType3|::T */ {
+  lowered final self::ExtensionType3<self::ExtensionType3|::T> /* = self::ExtensionType3|::T */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType3|_#new#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|_#new#tearOff::T>
+static inline-class-member method ExtensionType3|_#new#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType3<self::ExtensionType3|_#new#tearOff::T> /* = self::ExtensionType3|_#new#tearOff::T */
   return self::ExtensionType3|<self::ExtensionType3|_#new#tearOff::T>(it);
-static inline-class-member method ExtensionType4|(dynamic it) → self::ExtensionType4 {
-  lowered final self::ExtensionType4 #this = it;
+static inline-class-member method ExtensionType4|(dynamic it) → self::ExtensionType4 /* = core::int */ {
+  lowered final self::ExtensionType4 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType4|_#new#tearOff(dynamic it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#new#tearOff(dynamic it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|constructor(core::int it) → self::ExtensionType4 {
-  lowered final self::ExtensionType4 #this = it;
+static inline-class-member method ExtensionType4|constructor(core::int it) → self::ExtensionType4 /* = core::int */ {
+  lowered final self::ExtensionType4 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType4|_#constructor#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#constructor#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|constructor(it);
-static inline-class-member method ExtensionType4|redirect(core::int it) → self::ExtensionType4 {
-  lowered final self::ExtensionType4 #this;
+static inline-class-member method ExtensionType4|redirect(core::int it) → self::ExtensionType4 /* = core::int */ {
+  lowered final self::ExtensionType4 /* = core::int */ #this;
   #this = self::ExtensionType4|(it);
   return #this;
 }
-static inline-class-member method ExtensionType4|_#redirect#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#redirect#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|redirect(it);
-static inline-class-member method ExtensionType4|fact(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|fact(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|_#fact#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#fact#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|fact(it);
-static inline-class-member method ExtensionType4|redirectingFactory(core::int it) → self::ExtensionType4 /* redirection-target: self::ExtensionType4| */
+static inline-class-member method ExtensionType4|redirectingFactory(core::int it) → self::ExtensionType4 /* = core::int */ /* redirection-target: self::ExtensionType4| */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|_#redirectingFactory#tearOff(core::int it) → self::ExtensionType4
+static inline-class-member method ExtensionType4|_#redirectingFactory#tearOff(core::int it) → self::ExtensionType4 /* = core::int */
   return self::ExtensionType4|(it);
-static inline-class-member method ExtensionType4|get#getter(lowered final self::ExtensionType4 #this) → core::int
+static inline-class-member method ExtensionType4|get#getter(lowered final self::ExtensionType4 /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType4|set#setter(lowered final self::ExtensionType4 #this, core::int value) → void {}
-static inline-class-member method ExtensionType4|method(lowered final self::ExtensionType4 #this) → core::int
+static inline-class-member method ExtensionType4|set#setter(lowered final self::ExtensionType4 /* = core::int */ #this, core::int value) → void {}
+static inline-class-member method ExtensionType4|method(lowered final self::ExtensionType4 /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType4|get#method(lowered final self::ExtensionType4 #this) → () → core::int
+static inline-class-member method ExtensionType4|get#method(lowered final self::ExtensionType4 /* = core::int */ #this) → () → core::int
   return () → core::int => self::ExtensionType4|method(#this);
-static inline-class-member method ExtensionType4|[](lowered final self::ExtensionType4 #this, core::int index) → core::int
+static inline-class-member method ExtensionType4|[](lowered final self::ExtensionType4 /* = core::int */ #this, core::int index) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType4|[]=(lowered final self::ExtensionType4 #this, core::int index, core::int value) → void {}
+static inline-class-member method ExtensionType4|[]=(lowered final self::ExtensionType4 /* = core::int */ #this, core::int index, core::int value) → void {}
 static inline-class-member get ExtensionType4|staticGetter() → core::int
   return 42;
 static inline-class-member set ExtensionType4|staticSetter(core::int value) → void {}
 static inline-class-member method ExtensionType4|staticMethod() → core::int
   return 42;
-static inline-class-member method ExtensionType5|(dynamic it) → self::ExtensionType5 {
-  lowered final self::ExtensionType5 #this = it;
+static inline-class-member method ExtensionType5|(dynamic it) → self::ExtensionType5 /* = core::int */ {
+  lowered final self::ExtensionType5 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType5|_#new#tearOff(dynamic it) → self::ExtensionType5
+static inline-class-member method ExtensionType5|_#new#tearOff(dynamic it) → self::ExtensionType5 /* = core::int */
   return self::ExtensionType5|(it);
-static inline-class-member method ExtensionType6|id(dynamic it) → self::ExtensionType6 {
-  lowered final self::ExtensionType6 #this = it;
+static inline-class-member method ExtensionType6|id(dynamic it) → self::ExtensionType6 /* = core::int */ {
+  lowered final self::ExtensionType6 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType6|_#id#tearOff(dynamic it) → self::ExtensionType6
+static inline-class-member method ExtensionType6|_#id#tearOff(dynamic it) → self::ExtensionType6 /* = core::int */
   return self::ExtensionType6|id(it);
-static inline-class-member method ExtensionType7|id<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|id::T> {
-  lowered final self::ExtensionType7<self::ExtensionType7|id::T> #this = it;
+static inline-class-member method ExtensionType7|id<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|id::T> /* = core::int */ {
+  lowered final self::ExtensionType7<self::ExtensionType7|id::T> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType7|_#id#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|_#id#tearOff::T>
+static inline-class-member method ExtensionType7|_#id#tearOff<T extends core::num = dynamic>(dynamic it) → self::ExtensionType7<self::ExtensionType7|_#id#tearOff::T> /* = core::int */
   return self::ExtensionType7|id<self::ExtensionType7|_#id#tearOff::T>(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/external.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/external.dart.strong.expect
index 1e7519f1e32..f386cdf448e 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/external.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/external.dart.strong.expect
@@ -37,43 +37,43 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-static inline-class-member method B|_(dynamic a) → self::B {
-  lowered final self::B #this = a;
+static inline-class-member method B|_(dynamic a) → self::B /* = self::A */ {
+  lowered final self::B /* = self::A */ #this = a;
   return #this;
 }
-static inline-class-member method B|_#_#tearOff(dynamic a) → self::B
+static inline-class-member method B|_#_#tearOff(dynamic a) → self::B /* = self::A */
   return self::B|_(a);
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends self::B>(lowered final self::B #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends self::B>(T) → T
-  return <T extends self::B>(T t) → T => self::B|genericMethod<T>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|genericMethod<T extends self::B /* = self::A */>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends self::B /* = self::A */>(T) → T
+  return <T extends self::B /* = self::A */>(T t) → T => self::B|genericMethod<T>(#this, t);
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
 external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = self::B|(a);
-  self::B b2 = self::B|named(0);
+  self::B /* = self::A */ b1 = self::B|(a);
+  self::B /* = self::A */ b2 = self::B|named(0);
   a = self::B|get#field(b1);
   self::B|set#field(b1, a);
   a = self::B|method(b1);
   () → self::A f1 = self::B|get#method(b1);
-  b2 = self::B|genericMethod<self::B>(b2, b2);
-  <T extends self::B>(T) → T f2 = self::B|get#genericMethod(b2);
+  b2 = self::B|genericMethod<self::B /* = self::A */>(b2, b2);
+  <T extends self::B /* = self::A */>(T) → T f2 = self::B|get#genericMethod(b2);
   (core::int) → core::int f3 = self::B|get#genericMethod(b2)<core::int>;
   b1 = self::B|get#getter(b2);
   self::B|set#setter(b1, b2);
@@ -81,7 +81,7 @@ static method method(self::A a) → void {
   self::B|staticField = a;
   a = self::B|staticMethod();
   () → self::A f4 = #C1;
-  b2 = self::B|staticGenericMethod<self::B>(b2);
+  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
   <T extends core::Object? = dynamic>(T%) → T% f5 = #C2;
   (core::String) → core::String f6 = #C3;
   b1 = self::B|staticGetter;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/external.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/external.dart.strong.transformed.expect
index 1e7519f1e32..f386cdf448e 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/external.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/external.dart.strong.transformed.expect
@@ -37,43 +37,43 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-static inline-class-member method B|_(dynamic a) → self::B {
-  lowered final self::B #this = a;
+static inline-class-member method B|_(dynamic a) → self::B /* = self::A */ {
+  lowered final self::B /* = self::A */ #this = a;
   return #this;
 }
-static inline-class-member method B|_#_#tearOff(dynamic a) → self::B
+static inline-class-member method B|_#_#tearOff(dynamic a) → self::B /* = self::A */
   return self::B|_(a);
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends self::B>(lowered final self::B #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends self::B>(T) → T
-  return <T extends self::B>(T t) → T => self::B|genericMethod<T>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|genericMethod<T extends self::B /* = self::A */>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends self::B /* = self::A */>(T) → T
+  return <T extends self::B /* = self::A */>(T t) → T => self::B|genericMethod<T>(#this, t);
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
 external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = self::B|(a);
-  self::B b2 = self::B|named(0);
+  self::B /* = self::A */ b1 = self::B|(a);
+  self::B /* = self::A */ b2 = self::B|named(0);
   a = self::B|get#field(b1);
   self::B|set#field(b1, a);
   a = self::B|method(b1);
   () → self::A f1 = self::B|get#method(b1);
-  b2 = self::B|genericMethod<self::B>(b2, b2);
-  <T extends self::B>(T) → T f2 = self::B|get#genericMethod(b2);
+  b2 = self::B|genericMethod<self::B /* = self::A */>(b2, b2);
+  <T extends self::B /* = self::A */>(T) → T f2 = self::B|get#genericMethod(b2);
   (core::int) → core::int f3 = self::B|get#genericMethod(b2)<core::int>;
   b1 = self::B|get#getter(b2);
   self::B|set#setter(b1, b2);
@@ -81,7 +81,7 @@ static method method(self::A a) → void {
   self::B|staticField = a;
   a = self::B|staticMethod();
   () → self::A f4 = #C1;
-  b2 = self::B|staticGenericMethod<self::B>(b2);
+  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
   <T extends core::Object? = dynamic>(T%) → T% f5 = #C2;
   (core::String) → core::String f6 = #C3;
   b1 = self::B|staticGetter;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/external.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/external.dart.weak.expect
index 597de539bf6..5dc61aa6852 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/external.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/external.dart.weak.expect
@@ -37,43 +37,43 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-static inline-class-member method B|_(dynamic a) → self::B {
-  lowered final self::B #this = a;
+static inline-class-member method B|_(dynamic a) → self::B /* = self::A */ {
+  lowered final self::B /* = self::A */ #this = a;
   return #this;
 }
-static inline-class-member method B|_#_#tearOff(dynamic a) → self::B
+static inline-class-member method B|_#_#tearOff(dynamic a) → self::B /* = self::A */
   return self::B|_(a);
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends self::B>(lowered final self::B #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends self::B>(T) → T
-  return <T extends self::B>(T t) → T => self::B|genericMethod<T>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|genericMethod<T extends self::B /* = self::A */>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends self::B /* = self::A */>(T) → T
+  return <T extends self::B /* = self::A */>(T t) → T => self::B|genericMethod<T>(#this, t);
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
 external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = self::B|(a);
-  self::B b2 = self::B|named(0);
+  self::B /* = self::A */ b1 = self::B|(a);
+  self::B /* = self::A */ b2 = self::B|named(0);
   a = self::B|get#field(b1);
   self::B|set#field(b1, a);
   a = self::B|method(b1);
   () → self::A f1 = self::B|get#method(b1);
-  b2 = self::B|genericMethod<self::B>(b2, b2);
-  <T extends self::B>(T) → T f2 = self::B|get#genericMethod(b2);
+  b2 = self::B|genericMethod<self::B /* = self::A */>(b2, b2);
+  <T extends self::B /* = self::A */>(T) → T f2 = self::B|get#genericMethod(b2);
   (core::int) → core::int f3 = self::B|get#genericMethod(b2)<core::int>;
   b1 = self::B|get#getter(b2);
   self::B|set#setter(b1, b2);
@@ -81,7 +81,7 @@ static method method(self::A a) → void {
   self::B|staticField = a;
   a = self::B|staticMethod();
   () → self::A f4 = #C1;
-  b2 = self::B|staticGenericMethod<self::B>(b2);
+  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
   <T extends core::Object? = dynamic>(T%) → T% f5 = #C2;
   (core::String) → core::String f6 = #C3;
   b1 = self::B|staticGetter;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/external.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/external.dart.weak.modular.expect
index 597de539bf6..5dc61aa6852 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/external.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/external.dart.weak.modular.expect
@@ -37,43 +37,43 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-static inline-class-member method B|_(dynamic a) → self::B {
-  lowered final self::B #this = a;
+static inline-class-member method B|_(dynamic a) → self::B /* = self::A */ {
+  lowered final self::B /* = self::A */ #this = a;
   return #this;
 }
-static inline-class-member method B|_#_#tearOff(dynamic a) → self::B
+static inline-class-member method B|_#_#tearOff(dynamic a) → self::B /* = self::A */
   return self::B|_(a);
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends self::B>(lowered final self::B #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends self::B>(T) → T
-  return <T extends self::B>(T t) → T => self::B|genericMethod<T>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|genericMethod<T extends self::B /* = self::A */>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends self::B /* = self::A */>(T) → T
+  return <T extends self::B /* = self::A */>(T t) → T => self::B|genericMethod<T>(#this, t);
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
 external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = self::B|(a);
-  self::B b2 = self::B|named(0);
+  self::B /* = self::A */ b1 = self::B|(a);
+  self::B /* = self::A */ b2 = self::B|named(0);
   a = self::B|get#field(b1);
   self::B|set#field(b1, a);
   a = self::B|method(b1);
   () → self::A f1 = self::B|get#method(b1);
-  b2 = self::B|genericMethod<self::B>(b2, b2);
-  <T extends self::B>(T) → T f2 = self::B|get#genericMethod(b2);
+  b2 = self::B|genericMethod<self::B /* = self::A */>(b2, b2);
+  <T extends self::B /* = self::A */>(T) → T f2 = self::B|get#genericMethod(b2);
   (core::int) → core::int f3 = self::B|get#genericMethod(b2)<core::int>;
   b1 = self::B|get#getter(b2);
   self::B|set#setter(b1, b2);
@@ -81,7 +81,7 @@ static method method(self::A a) → void {
   self::B|staticField = a;
   a = self::B|staticMethod();
   () → self::A f4 = #C1;
-  b2 = self::B|staticGenericMethod<self::B>(b2);
+  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
   <T extends core::Object? = dynamic>(T%) → T% f5 = #C2;
   (core::String) → core::String f6 = #C3;
   b1 = self::B|staticGetter;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/external.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/external.dart.weak.outline.expect
index c3c36e694f7..27b3887261e 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/external.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/external.dart.weak.outline.expect
@@ -28,31 +28,31 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-static inline-class-member method B|_(dynamic a) → self::B
+static inline-class-member method B|_(dynamic a) → self::B /* = self::A */
   ;
-static inline-class-member method B|_#_#tearOff(dynamic a) → self::B
+static inline-class-member method B|_#_#tearOff(dynamic a) → self::B /* = self::A */
   return self::B|_(a);
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends self::B>(lowered final self::B #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends self::B>(T) → T
-  return <T extends self::B>(T t) → T => self::B|genericMethod<T>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|genericMethod<T extends self::B /* = self::A */>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends self::B /* = self::A */>(T) → T
+  return <T extends self::B /* = self::A */>(T t) → T => self::B|genericMethod<T>(#this, t);
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
 external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/external.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/external.dart.weak.transformed.expect
index 597de539bf6..5dc61aa6852 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/external.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/external.dart.weak.transformed.expect
@@ -37,43 +37,43 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-static inline-class-member method B|_(dynamic a) → self::B {
-  lowered final self::B #this = a;
+static inline-class-member method B|_(dynamic a) → self::B /* = self::A */ {
+  lowered final self::B /* = self::A */ #this = a;
   return #this;
 }
-static inline-class-member method B|_#_#tearOff(dynamic a) → self::B
+static inline-class-member method B|_#_#tearOff(dynamic a) → self::B /* = self::A */
   return self::B|_(a);
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends self::B>(lowered final self::B #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends self::B>(T) → T
-  return <T extends self::B>(T t) → T => self::B|genericMethod<T>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|genericMethod<T extends self::B /* = self::A */>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T t) → self::B|genericMethod::T;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends self::B /* = self::A */>(T) → T
+  return <T extends self::B /* = self::A */>(T t) → T => self::B|genericMethod<T>(#this, t);
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
 external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = self::B|(a);
-  self::B b2 = self::B|named(0);
+  self::B /* = self::A */ b1 = self::B|(a);
+  self::B /* = self::A */ b2 = self::B|named(0);
   a = self::B|get#field(b1);
   self::B|set#field(b1, a);
   a = self::B|method(b1);
   () → self::A f1 = self::B|get#method(b1);
-  b2 = self::B|genericMethod<self::B>(b2, b2);
-  <T extends self::B>(T) → T f2 = self::B|get#genericMethod(b2);
+  b2 = self::B|genericMethod<self::B /* = self::A */>(b2, b2);
+  <T extends self::B /* = self::A */>(T) → T f2 = self::B|get#genericMethod(b2);
   (core::int) → core::int f3 = self::B|get#genericMethod(b2)<core::int>;
   b1 = self::B|get#getter(b2);
   self::B|set#setter(b1, b2);
@@ -81,7 +81,7 @@ static method method(self::A a) → void {
   self::B|staticField = a;
   a = self::B|staticMethod();
   () → self::A f4 = #C1;
-  b2 = self::B|staticGenericMethod<self::B>(b2);
+  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
   <T extends core::Object? = dynamic>(T%) → T% f5 = #C2;
   (core::String) → core::String f6 = #C3;
   b1 = self::B|staticGetter;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.strong.expect
index 381d49be46e..00bb75e2c44 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.strong.expect
@@ -337,13 +337,13 @@ extension type ErroneousInlineClass(core::int a) {
   tearoff • = self::ErroneousInlineClass|_#new#tearOff;
 }
 static extension-member method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
-static inline-class-member method InlineClass|(dynamic it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(dynamic it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → void {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:15:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -363,15 +363,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = 42; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = 42;
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → void
   return () → void => self::InlineClass|test(#this);
-static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
-  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> #this = it;
+static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ {
+  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
+static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%> /* = self::GenericInlineClass|_#new#tearOff::T% */
   return self::GenericInlineClass|<self::GenericInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
+static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> /* = self::GenericInlineClass|test::T% */ #this, self::GenericInlineClass|test::T% t) → void {
   self::GenericInlineClass|test::T% a1 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   self::GenericInlineClass|test::T% a2 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:26:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T'.
@@ -391,15 +391,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = t; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = t;
 }
-static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
+static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> /* = self::GenericInlineClass|get#test::T% */ #this) → (self::GenericInlineClass|get#test::T%) → void
   return (self::GenericInlineClass|get#test::T% t) → void => self::GenericInlineClass|test<self::GenericInlineClass|get#test::T%>(#this, t);
-static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
-  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> #this = it;
+static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ {
+  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
+static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%> /* = () → self::FunctionInlineClass|_#new#tearOff::T% */
   return self::FunctionInlineClass|<self::FunctionInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
+static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> /* = () → self::FunctionInlineClass|test::T% */ #this, () → self::FunctionInlineClass|test::T% t) → void {
   () → self::FunctionInlineClass|test::T% a1 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   () → self::FunctionInlineClass|test::T% a2 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:37:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T Function()'.
@@ -423,15 +423,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   self::FunctionInlineClass|test::T% d3 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
   self::FunctionInlineClass|test::T% d4 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
 }
-static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
+static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> /* = () → self::FunctionInlineClass|get#test::T% */ #this) → (() → self::FunctionInlineClass|get#test::T%) → void
   return (() → self::FunctionInlineClass|get#test::T% t) → void => self::FunctionInlineClass|test<self::FunctionInlineClass|get#test::T%>(#this, t);
-static inline-class-member method GenericFunctionInlineClass|(dynamic it) → self::GenericFunctionInlineClass {
-  lowered final self::GenericFunctionInlineClass #this = it;
+static inline-class-member method GenericFunctionInlineClass|(dynamic it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ {
+  lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(dynamic it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(dynamic it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */
   return self::GenericFunctionInlineClass|(it);
-static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
+static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → void {
   <T extends core::Object? = dynamic>() → T% a1 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   <T extends core::Object? = dynamic>() → T% a2 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   () → core::int a3 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>;
@@ -459,15 +459,15 @@ Try correcting the name to the name of an existing getter, or defining a getter
   core::int e1 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
   core::int e2 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
 }
-static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
+static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → () → void
   return () → void => self::GenericFunctionInlineClass|test(#this);
-static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
-  lowered final self::DynamicInlineClass #this = it;
+static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass /* = dynamic */ {
+  lowered final self::DynamicInlineClass /* = dynamic */ #this = it;
   return #this;
 }
-static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass /* = dynamic */
   return self::DynamicInlineClass|(it);
-static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
+static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → void {
   dynamic a1 = #this as{Unchecked} dynamic;
   dynamic a2 = #this as{Unchecked} dynamic;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:72:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
@@ -491,15 +491,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   dynamic d3 = (#this as{Unchecked} dynamic){dynamic}.call();
   dynamic d4 = (#this as{Unchecked} dynamic){dynamic}.call();
 }
-static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
+static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → () → void
   return () → void => self::DynamicInlineClass|test(#this);
-static inline-class-member method ErroneousInlineClass|(dynamic a, dynamic b) → self::ErroneousInlineClass {
-  lowered final self::ErroneousInlineClass #this = b;
+static inline-class-member method ErroneousInlineClass|(dynamic a, dynamic b) → self::ErroneousInlineClass /* = core::int */ {
+  lowered final self::ErroneousInlineClass /* = core::int */ #this = b;
   return #this;
 }
-static inline-class-member method ErroneousInlineClass|_#new#tearOff(dynamic a, dynamic b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|_#new#tearOff(dynamic a, dynamic b) → self::ErroneousInlineClass /* = core::int */
   return self::ErroneousInlineClass|(a, b);
-static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
+static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   dynamic a3 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:87:19: Error: The getter 'b' isn't defined for the class 'ErroneousInlineClass'.
@@ -575,9 +575,9 @@ Try correcting the name to the name of an existing getter, or defining a getter
     var e4 = b.call(); // Error
              ^" in #this{<unresolved>}.b{dynamic}.call();
 }
-static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
+static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → () → void
   return () → void => self::ErroneousInlineClass|test(#this);
-static method test(self::InlineClass inlineClass, self::GenericInlineClass<core::String> genericInlineClass, self::FunctionInlineClass<core::String> functionInlineClass, self::GenericFunctionInlineClass genericFunctionInlineClass, self::DynamicInlineClass dynamicInlineClass, self::ErroneousInlineClass erroneousInlineClass, #lib1::PrivateInlineClass privateInlineClass) → void {
+static method test(self::InlineClass /* = core::int */ inlineClass, self::GenericInlineClass<core::String> /* = core::String */ genericInlineClass, self::FunctionInlineClass<core::String> /* = () → core::String */ functionInlineClass, self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ genericFunctionInlineClass, self::DynamicInlineClass /* = dynamic */ dynamicInlineClass, self::ErroneousInlineClass /* = core::int */ erroneousInlineClass, #lib1::PrivateInlineClass /* = core::int */ privateInlineClass) → void {
   core::int a1 = inlineClass as{Unchecked} core::int;
   invalid-type a2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:118:26: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
 Try changing the operand or remove the type arguments.
@@ -694,13 +694,13 @@ extension type PrivateInlineClass(core::int _it) {
   constructor • = self2::PrivateInlineClass|;
   tearoff • = self2::PrivateInlineClass|_#new#tearOff;
 }
-static inline-class-member method PrivateInlineClass|(dynamic _it) → self2::PrivateInlineClass {
-  lowered final self2::PrivateInlineClass #this = _it;
+static inline-class-member method PrivateInlineClass|(dynamic _it) → self2::PrivateInlineClass /* = core::int */ {
+  lowered final self2::PrivateInlineClass /* = core::int */ #this = _it;
   return #this;
 }
-static inline-class-member method PrivateInlineClass|_#new#tearOff(dynamic _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|_#new#tearOff(dynamic _it) → self2::PrivateInlineClass /* = core::int */
   return self2::PrivateInlineClass|(_it);
-static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
+static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access_lib.dart:9:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -720,5 +720,5 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = _it = 42; // Error, should not resolve to extension method.
              ^^^" in #this{<unresolved>}._it = 42;
 }
-static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
+static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → () → void
   return () → void => self2::PrivateInlineClass|test(#this);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.strong.transformed.expect
index 381d49be46e..00bb75e2c44 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.strong.transformed.expect
@@ -337,13 +337,13 @@ extension type ErroneousInlineClass(core::int a) {
   tearoff • = self::ErroneousInlineClass|_#new#tearOff;
 }
 static extension-member method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
-static inline-class-member method InlineClass|(dynamic it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(dynamic it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → void {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:15:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -363,15 +363,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = 42; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = 42;
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → void
   return () → void => self::InlineClass|test(#this);
-static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
-  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> #this = it;
+static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ {
+  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
+static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%> /* = self::GenericInlineClass|_#new#tearOff::T% */
   return self::GenericInlineClass|<self::GenericInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
+static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> /* = self::GenericInlineClass|test::T% */ #this, self::GenericInlineClass|test::T% t) → void {
   self::GenericInlineClass|test::T% a1 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   self::GenericInlineClass|test::T% a2 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:26:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T'.
@@ -391,15 +391,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = t; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = t;
 }
-static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
+static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> /* = self::GenericInlineClass|get#test::T% */ #this) → (self::GenericInlineClass|get#test::T%) → void
   return (self::GenericInlineClass|get#test::T% t) → void => self::GenericInlineClass|test<self::GenericInlineClass|get#test::T%>(#this, t);
-static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
-  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> #this = it;
+static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ {
+  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
+static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%> /* = () → self::FunctionInlineClass|_#new#tearOff::T% */
   return self::FunctionInlineClass|<self::FunctionInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
+static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> /* = () → self::FunctionInlineClass|test::T% */ #this, () → self::FunctionInlineClass|test::T% t) → void {
   () → self::FunctionInlineClass|test::T% a1 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   () → self::FunctionInlineClass|test::T% a2 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:37:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T Function()'.
@@ -423,15 +423,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   self::FunctionInlineClass|test::T% d3 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
   self::FunctionInlineClass|test::T% d4 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
 }
-static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
+static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> /* = () → self::FunctionInlineClass|get#test::T% */ #this) → (() → self::FunctionInlineClass|get#test::T%) → void
   return (() → self::FunctionInlineClass|get#test::T% t) → void => self::FunctionInlineClass|test<self::FunctionInlineClass|get#test::T%>(#this, t);
-static inline-class-member method GenericFunctionInlineClass|(dynamic it) → self::GenericFunctionInlineClass {
-  lowered final self::GenericFunctionInlineClass #this = it;
+static inline-class-member method GenericFunctionInlineClass|(dynamic it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ {
+  lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(dynamic it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(dynamic it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */
   return self::GenericFunctionInlineClass|(it);
-static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
+static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → void {
   <T extends core::Object? = dynamic>() → T% a1 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   <T extends core::Object? = dynamic>() → T% a2 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   () → core::int a3 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>;
@@ -459,15 +459,15 @@ Try correcting the name to the name of an existing getter, or defining a getter
   core::int e1 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
   core::int e2 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
 }
-static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
+static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → () → void
   return () → void => self::GenericFunctionInlineClass|test(#this);
-static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
-  lowered final self::DynamicInlineClass #this = it;
+static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass /* = dynamic */ {
+  lowered final self::DynamicInlineClass /* = dynamic */ #this = it;
   return #this;
 }
-static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass /* = dynamic */
   return self::DynamicInlineClass|(it);
-static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
+static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → void {
   dynamic a1 = #this as{Unchecked} dynamic;
   dynamic a2 = #this as{Unchecked} dynamic;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:72:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
@@ -491,15 +491,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   dynamic d3 = (#this as{Unchecked} dynamic){dynamic}.call();
   dynamic d4 = (#this as{Unchecked} dynamic){dynamic}.call();
 }
-static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
+static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → () → void
   return () → void => self::DynamicInlineClass|test(#this);
-static inline-class-member method ErroneousInlineClass|(dynamic a, dynamic b) → self::ErroneousInlineClass {
-  lowered final self::ErroneousInlineClass #this = b;
+static inline-class-member method ErroneousInlineClass|(dynamic a, dynamic b) → self::ErroneousInlineClass /* = core::int */ {
+  lowered final self::ErroneousInlineClass /* = core::int */ #this = b;
   return #this;
 }
-static inline-class-member method ErroneousInlineClass|_#new#tearOff(dynamic a, dynamic b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|_#new#tearOff(dynamic a, dynamic b) → self::ErroneousInlineClass /* = core::int */
   return self::ErroneousInlineClass|(a, b);
-static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
+static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   dynamic a3 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:87:19: Error: The getter 'b' isn't defined for the class 'ErroneousInlineClass'.
@@ -575,9 +575,9 @@ Try correcting the name to the name of an existing getter, or defining a getter
     var e4 = b.call(); // Error
              ^" in #this{<unresolved>}.b{dynamic}.call();
 }
-static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
+static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → () → void
   return () → void => self::ErroneousInlineClass|test(#this);
-static method test(self::InlineClass inlineClass, self::GenericInlineClass<core::String> genericInlineClass, self::FunctionInlineClass<core::String> functionInlineClass, self::GenericFunctionInlineClass genericFunctionInlineClass, self::DynamicInlineClass dynamicInlineClass, self::ErroneousInlineClass erroneousInlineClass, #lib1::PrivateInlineClass privateInlineClass) → void {
+static method test(self::InlineClass /* = core::int */ inlineClass, self::GenericInlineClass<core::String> /* = core::String */ genericInlineClass, self::FunctionInlineClass<core::String> /* = () → core::String */ functionInlineClass, self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ genericFunctionInlineClass, self::DynamicInlineClass /* = dynamic */ dynamicInlineClass, self::ErroneousInlineClass /* = core::int */ erroneousInlineClass, #lib1::PrivateInlineClass /* = core::int */ privateInlineClass) → void {
   core::int a1 = inlineClass as{Unchecked} core::int;
   invalid-type a2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:118:26: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
 Try changing the operand or remove the type arguments.
@@ -694,13 +694,13 @@ extension type PrivateInlineClass(core::int _it) {
   constructor • = self2::PrivateInlineClass|;
   tearoff • = self2::PrivateInlineClass|_#new#tearOff;
 }
-static inline-class-member method PrivateInlineClass|(dynamic _it) → self2::PrivateInlineClass {
-  lowered final self2::PrivateInlineClass #this = _it;
+static inline-class-member method PrivateInlineClass|(dynamic _it) → self2::PrivateInlineClass /* = core::int */ {
+  lowered final self2::PrivateInlineClass /* = core::int */ #this = _it;
   return #this;
 }
-static inline-class-member method PrivateInlineClass|_#new#tearOff(dynamic _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|_#new#tearOff(dynamic _it) → self2::PrivateInlineClass /* = core::int */
   return self2::PrivateInlineClass|(_it);
-static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
+static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access_lib.dart:9:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -720,5 +720,5 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = _it = 42; // Error, should not resolve to extension method.
              ^^^" in #this{<unresolved>}._it = 42;
 }
-static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
+static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → () → void
   return () → void => self2::PrivateInlineClass|test(#this);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.weak.expect
index 381d49be46e..00bb75e2c44 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.weak.expect
@@ -337,13 +337,13 @@ extension type ErroneousInlineClass(core::int a) {
   tearoff • = self::ErroneousInlineClass|_#new#tearOff;
 }
 static extension-member method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
-static inline-class-member method InlineClass|(dynamic it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(dynamic it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → void {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:15:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -363,15 +363,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = 42; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = 42;
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → void
   return () → void => self::InlineClass|test(#this);
-static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
-  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> #this = it;
+static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ {
+  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
+static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%> /* = self::GenericInlineClass|_#new#tearOff::T% */
   return self::GenericInlineClass|<self::GenericInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
+static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> /* = self::GenericInlineClass|test::T% */ #this, self::GenericInlineClass|test::T% t) → void {
   self::GenericInlineClass|test::T% a1 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   self::GenericInlineClass|test::T% a2 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:26:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T'.
@@ -391,15 +391,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = t; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = t;
 }
-static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
+static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> /* = self::GenericInlineClass|get#test::T% */ #this) → (self::GenericInlineClass|get#test::T%) → void
   return (self::GenericInlineClass|get#test::T% t) → void => self::GenericInlineClass|test<self::GenericInlineClass|get#test::T%>(#this, t);
-static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
-  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> #this = it;
+static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ {
+  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
+static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%> /* = () → self::FunctionInlineClass|_#new#tearOff::T% */
   return self::FunctionInlineClass|<self::FunctionInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
+static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> /* = () → self::FunctionInlineClass|test::T% */ #this, () → self::FunctionInlineClass|test::T% t) → void {
   () → self::FunctionInlineClass|test::T% a1 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   () → self::FunctionInlineClass|test::T% a2 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:37:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T Function()'.
@@ -423,15 +423,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   self::FunctionInlineClass|test::T% d3 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
   self::FunctionInlineClass|test::T% d4 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
 }
-static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
+static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> /* = () → self::FunctionInlineClass|get#test::T% */ #this) → (() → self::FunctionInlineClass|get#test::T%) → void
   return (() → self::FunctionInlineClass|get#test::T% t) → void => self::FunctionInlineClass|test<self::FunctionInlineClass|get#test::T%>(#this, t);
-static inline-class-member method GenericFunctionInlineClass|(dynamic it) → self::GenericFunctionInlineClass {
-  lowered final self::GenericFunctionInlineClass #this = it;
+static inline-class-member method GenericFunctionInlineClass|(dynamic it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ {
+  lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(dynamic it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(dynamic it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */
   return self::GenericFunctionInlineClass|(it);
-static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
+static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → void {
   <T extends core::Object? = dynamic>() → T% a1 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   <T extends core::Object? = dynamic>() → T% a2 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   () → core::int a3 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>;
@@ -459,15 +459,15 @@ Try correcting the name to the name of an existing getter, or defining a getter
   core::int e1 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
   core::int e2 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
 }
-static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
+static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → () → void
   return () → void => self::GenericFunctionInlineClass|test(#this);
-static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
-  lowered final self::DynamicInlineClass #this = it;
+static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass /* = dynamic */ {
+  lowered final self::DynamicInlineClass /* = dynamic */ #this = it;
   return #this;
 }
-static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass /* = dynamic */
   return self::DynamicInlineClass|(it);
-static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
+static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → void {
   dynamic a1 = #this as{Unchecked} dynamic;
   dynamic a2 = #this as{Unchecked} dynamic;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:72:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
@@ -491,15 +491,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   dynamic d3 = (#this as{Unchecked} dynamic){dynamic}.call();
   dynamic d4 = (#this as{Unchecked} dynamic){dynamic}.call();
 }
-static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
+static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → () → void
   return () → void => self::DynamicInlineClass|test(#this);
-static inline-class-member method ErroneousInlineClass|(dynamic a, dynamic b) → self::ErroneousInlineClass {
-  lowered final self::ErroneousInlineClass #this = b;
+static inline-class-member method ErroneousInlineClass|(dynamic a, dynamic b) → self::ErroneousInlineClass /* = core::int */ {
+  lowered final self::ErroneousInlineClass /* = core::int */ #this = b;
   return #this;
 }
-static inline-class-member method ErroneousInlineClass|_#new#tearOff(dynamic a, dynamic b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|_#new#tearOff(dynamic a, dynamic b) → self::ErroneousInlineClass /* = core::int */
   return self::ErroneousInlineClass|(a, b);
-static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
+static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   dynamic a3 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:87:19: Error: The getter 'b' isn't defined for the class 'ErroneousInlineClass'.
@@ -575,9 +575,9 @@ Try correcting the name to the name of an existing getter, or defining a getter
     var e4 = b.call(); // Error
              ^" in #this{<unresolved>}.b{dynamic}.call();
 }
-static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
+static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → () → void
   return () → void => self::ErroneousInlineClass|test(#this);
-static method test(self::InlineClass inlineClass, self::GenericInlineClass<core::String> genericInlineClass, self::FunctionInlineClass<core::String> functionInlineClass, self::GenericFunctionInlineClass genericFunctionInlineClass, self::DynamicInlineClass dynamicInlineClass, self::ErroneousInlineClass erroneousInlineClass, #lib1::PrivateInlineClass privateInlineClass) → void {
+static method test(self::InlineClass /* = core::int */ inlineClass, self::GenericInlineClass<core::String> /* = core::String */ genericInlineClass, self::FunctionInlineClass<core::String> /* = () → core::String */ functionInlineClass, self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ genericFunctionInlineClass, self::DynamicInlineClass /* = dynamic */ dynamicInlineClass, self::ErroneousInlineClass /* = core::int */ erroneousInlineClass, #lib1::PrivateInlineClass /* = core::int */ privateInlineClass) → void {
   core::int a1 = inlineClass as{Unchecked} core::int;
   invalid-type a2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:118:26: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
 Try changing the operand or remove the type arguments.
@@ -694,13 +694,13 @@ extension type PrivateInlineClass(core::int _it) {
   constructor • = self2::PrivateInlineClass|;
   tearoff • = self2::PrivateInlineClass|_#new#tearOff;
 }
-static inline-class-member method PrivateInlineClass|(dynamic _it) → self2::PrivateInlineClass {
-  lowered final self2::PrivateInlineClass #this = _it;
+static inline-class-member method PrivateInlineClass|(dynamic _it) → self2::PrivateInlineClass /* = core::int */ {
+  lowered final self2::PrivateInlineClass /* = core::int */ #this = _it;
   return #this;
 }
-static inline-class-member method PrivateInlineClass|_#new#tearOff(dynamic _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|_#new#tearOff(dynamic _it) → self2::PrivateInlineClass /* = core::int */
   return self2::PrivateInlineClass|(_it);
-static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
+static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access_lib.dart:9:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -720,5 +720,5 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = _it = 42; // Error, should not resolve to extension method.
              ^^^" in #this{<unresolved>}._it = 42;
 }
-static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
+static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → () → void
   return () → void => self2::PrivateInlineClass|test(#this);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.weak.modular.expect
index 381d49be46e..00bb75e2c44 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.weak.modular.expect
@@ -337,13 +337,13 @@ extension type ErroneousInlineClass(core::int a) {
   tearoff • = self::ErroneousInlineClass|_#new#tearOff;
 }
 static extension-member method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
-static inline-class-member method InlineClass|(dynamic it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(dynamic it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → void {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:15:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -363,15 +363,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = 42; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = 42;
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → void
   return () → void => self::InlineClass|test(#this);
-static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
-  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> #this = it;
+static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ {
+  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
+static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%> /* = self::GenericInlineClass|_#new#tearOff::T% */
   return self::GenericInlineClass|<self::GenericInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
+static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> /* = self::GenericInlineClass|test::T% */ #this, self::GenericInlineClass|test::T% t) → void {
   self::GenericInlineClass|test::T% a1 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   self::GenericInlineClass|test::T% a2 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:26:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T'.
@@ -391,15 +391,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = t; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = t;
 }
-static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
+static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> /* = self::GenericInlineClass|get#test::T% */ #this) → (self::GenericInlineClass|get#test::T%) → void
   return (self::GenericInlineClass|get#test::T% t) → void => self::GenericInlineClass|test<self::GenericInlineClass|get#test::T%>(#this, t);
-static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
-  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> #this = it;
+static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ {
+  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
+static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%> /* = () → self::FunctionInlineClass|_#new#tearOff::T% */
   return self::FunctionInlineClass|<self::FunctionInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
+static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> /* = () → self::FunctionInlineClass|test::T% */ #this, () → self::FunctionInlineClass|test::T% t) → void {
   () → self::FunctionInlineClass|test::T% a1 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   () → self::FunctionInlineClass|test::T% a2 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:37:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T Function()'.
@@ -423,15 +423,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   self::FunctionInlineClass|test::T% d3 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
   self::FunctionInlineClass|test::T% d4 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
 }
-static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
+static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> /* = () → self::FunctionInlineClass|get#test::T% */ #this) → (() → self::FunctionInlineClass|get#test::T%) → void
   return (() → self::FunctionInlineClass|get#test::T% t) → void => self::FunctionInlineClass|test<self::FunctionInlineClass|get#test::T%>(#this, t);
-static inline-class-member method GenericFunctionInlineClass|(dynamic it) → self::GenericFunctionInlineClass {
-  lowered final self::GenericFunctionInlineClass #this = it;
+static inline-class-member method GenericFunctionInlineClass|(dynamic it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ {
+  lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(dynamic it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(dynamic it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */
   return self::GenericFunctionInlineClass|(it);
-static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
+static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → void {
   <T extends core::Object? = dynamic>() → T% a1 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   <T extends core::Object? = dynamic>() → T% a2 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   () → core::int a3 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>;
@@ -459,15 +459,15 @@ Try correcting the name to the name of an existing getter, or defining a getter
   core::int e1 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
   core::int e2 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
 }
-static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
+static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → () → void
   return () → void => self::GenericFunctionInlineClass|test(#this);
-static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
-  lowered final self::DynamicInlineClass #this = it;
+static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass /* = dynamic */ {
+  lowered final self::DynamicInlineClass /* = dynamic */ #this = it;
   return #this;
 }
-static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass /* = dynamic */
   return self::DynamicInlineClass|(it);
-static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
+static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → void {
   dynamic a1 = #this as{Unchecked} dynamic;
   dynamic a2 = #this as{Unchecked} dynamic;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:72:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
@@ -491,15 +491,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   dynamic d3 = (#this as{Unchecked} dynamic){dynamic}.call();
   dynamic d4 = (#this as{Unchecked} dynamic){dynamic}.call();
 }
-static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
+static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → () → void
   return () → void => self::DynamicInlineClass|test(#this);
-static inline-class-member method ErroneousInlineClass|(dynamic a, dynamic b) → self::ErroneousInlineClass {
-  lowered final self::ErroneousInlineClass #this = b;
+static inline-class-member method ErroneousInlineClass|(dynamic a, dynamic b) → self::ErroneousInlineClass /* = core::int */ {
+  lowered final self::ErroneousInlineClass /* = core::int */ #this = b;
   return #this;
 }
-static inline-class-member method ErroneousInlineClass|_#new#tearOff(dynamic a, dynamic b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|_#new#tearOff(dynamic a, dynamic b) → self::ErroneousInlineClass /* = core::int */
   return self::ErroneousInlineClass|(a, b);
-static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
+static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   dynamic a3 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:87:19: Error: The getter 'b' isn't defined for the class 'ErroneousInlineClass'.
@@ -575,9 +575,9 @@ Try correcting the name to the name of an existing getter, or defining a getter
     var e4 = b.call(); // Error
              ^" in #this{<unresolved>}.b{dynamic}.call();
 }
-static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
+static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → () → void
   return () → void => self::ErroneousInlineClass|test(#this);
-static method test(self::InlineClass inlineClass, self::GenericInlineClass<core::String> genericInlineClass, self::FunctionInlineClass<core::String> functionInlineClass, self::GenericFunctionInlineClass genericFunctionInlineClass, self::DynamicInlineClass dynamicInlineClass, self::ErroneousInlineClass erroneousInlineClass, #lib1::PrivateInlineClass privateInlineClass) → void {
+static method test(self::InlineClass /* = core::int */ inlineClass, self::GenericInlineClass<core::String> /* = core::String */ genericInlineClass, self::FunctionInlineClass<core::String> /* = () → core::String */ functionInlineClass, self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ genericFunctionInlineClass, self::DynamicInlineClass /* = dynamic */ dynamicInlineClass, self::ErroneousInlineClass /* = core::int */ erroneousInlineClass, #lib1::PrivateInlineClass /* = core::int */ privateInlineClass) → void {
   core::int a1 = inlineClass as{Unchecked} core::int;
   invalid-type a2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:118:26: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
 Try changing the operand or remove the type arguments.
@@ -694,13 +694,13 @@ extension type PrivateInlineClass(core::int _it) {
   constructor • = self2::PrivateInlineClass|;
   tearoff • = self2::PrivateInlineClass|_#new#tearOff;
 }
-static inline-class-member method PrivateInlineClass|(dynamic _it) → self2::PrivateInlineClass {
-  lowered final self2::PrivateInlineClass #this = _it;
+static inline-class-member method PrivateInlineClass|(dynamic _it) → self2::PrivateInlineClass /* = core::int */ {
+  lowered final self2::PrivateInlineClass /* = core::int */ #this = _it;
   return #this;
 }
-static inline-class-member method PrivateInlineClass|_#new#tearOff(dynamic _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|_#new#tearOff(dynamic _it) → self2::PrivateInlineClass /* = core::int */
   return self2::PrivateInlineClass|(_it);
-static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
+static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access_lib.dart:9:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -720,5 +720,5 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = _it = 42; // Error, should not resolve to extension method.
              ^^^" in #this{<unresolved>}._it = 42;
 }
-static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
+static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → () → void
   return () → void => self2::PrivateInlineClass|test(#this);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.weak.outline.expect
index fe3c52ca4e5..ae96c28d314 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.weak.outline.expect
@@ -45,55 +45,55 @@ extension type ErroneousInlineClass(core::int a) {
 }
 static extension-member method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void
   ;
-static inline-class-member method InlineClass|(dynamic it) → self::InlineClass
+static inline-class-member method InlineClass|(dynamic it) → self::InlineClass /* = core::int */
   ;
-static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → void
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → void
   ;
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → void
   return () → void => self::InlineClass|test(#this);
-static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|::T%>
+static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */
   ;
-static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
+static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%> /* = self::GenericInlineClass|_#new#tearOff::T% */
   return self::GenericInlineClass|<self::GenericInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void
+static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> /* = self::GenericInlineClass|test::T% */ #this, self::GenericInlineClass|test::T% t) → void
   ;
-static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
+static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> /* = self::GenericInlineClass|get#test::T% */ #this) → (self::GenericInlineClass|get#test::T%) → void
   return (self::GenericInlineClass|get#test::T% t) → void => self::GenericInlineClass|test<self::GenericInlineClass|get#test::T%>(#this, t);
-static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%>
+static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */
   ;
-static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
+static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%> /* = () → self::FunctionInlineClass|_#new#tearOff::T% */
   return self::FunctionInlineClass|<self::FunctionInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void
+static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> /* = () → self::FunctionInlineClass|test::T% */ #this, () → self::FunctionInlineClass|test::T% t) → void
   ;
-static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
+static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> /* = () → self::FunctionInlineClass|get#test::T% */ #this) → (() → self::FunctionInlineClass|get#test::T%) → void
   return (() → self::FunctionInlineClass|get#test::T% t) → void => self::FunctionInlineClass|test<self::FunctionInlineClass|get#test::T%>(#this, t);
-static inline-class-member method GenericFunctionInlineClass|(dynamic it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|(dynamic it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */
   ;
-static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(dynamic it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(dynamic it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */
   return self::GenericFunctionInlineClass|(it);
-static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void
+static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → void
   ;
-static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
+static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → () → void
   return () → void => self::GenericFunctionInlineClass|test(#this);
-static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass /* = dynamic */
   ;
-static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass /* = dynamic */
   return self::DynamicInlineClass|(it);
-static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void
+static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → void
   ;
-static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
+static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → () → void
   return () → void => self::DynamicInlineClass|test(#this);
-static inline-class-member method ErroneousInlineClass|(dynamic a, dynamic b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|(dynamic a, dynamic b) → self::ErroneousInlineClass /* = core::int */
   ;
-static inline-class-member method ErroneousInlineClass|_#new#tearOff(dynamic a, dynamic b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|_#new#tearOff(dynamic a, dynamic b) → self::ErroneousInlineClass /* = core::int */
   return self::ErroneousInlineClass|(a, b);
-static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void
+static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → void
   ;
-static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
+static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → () → void
   return () → void => self::ErroneousInlineClass|test(#this);
-static method test(self::InlineClass inlineClass, self::GenericInlineClass<core::String> genericInlineClass, self::FunctionInlineClass<core::String> functionInlineClass, self::GenericFunctionInlineClass genericFunctionInlineClass, self::DynamicInlineClass dynamicInlineClass, self::ErroneousInlineClass erroneousInlineClass, #lib1::PrivateInlineClass privateInlineClass) → void
+static method test(self::InlineClass /* = core::int */ inlineClass, self::GenericInlineClass<core::String> /* = core::String */ genericInlineClass, self::FunctionInlineClass<core::String> /* = () → core::String */ functionInlineClass, self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ genericFunctionInlineClass, self::DynamicInlineClass /* = dynamic */ dynamicInlineClass, self::ErroneousInlineClass /* = core::int */ erroneousInlineClass, #lib1::PrivateInlineClass /* = core::int */ privateInlineClass) → void
   ;
 
 library;
@@ -106,11 +106,11 @@ extension type PrivateInlineClass(core::int _it) {
   constructor • = self2::PrivateInlineClass|;
   tearoff • = self2::PrivateInlineClass|_#new#tearOff;
 }
-static inline-class-member method PrivateInlineClass|(dynamic _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|(dynamic _it) → self2::PrivateInlineClass /* = core::int */
   ;
-static inline-class-member method PrivateInlineClass|_#new#tearOff(dynamic _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|_#new#tearOff(dynamic _it) → self2::PrivateInlineClass /* = core::int */
   return self2::PrivateInlineClass|(_it);
-static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void
+static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → void
   ;
-static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
+static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → () → void
   return () → void => self2::PrivateInlineClass|test(#this);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.weak.transformed.expect
index 381d49be46e..00bb75e2c44 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/field_access.dart.weak.transformed.expect
@@ -337,13 +337,13 @@ extension type ErroneousInlineClass(core::int a) {
   tearoff • = self::ErroneousInlineClass|_#new#tearOff;
 }
 static extension-member method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
-static inline-class-member method InlineClass|(dynamic it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(dynamic it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → void {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:15:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -363,15 +363,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = 42; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = 42;
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → void
   return () → void => self::InlineClass|test(#this);
-static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
-  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> #this = it;
+static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ {
+  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
+static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%> /* = self::GenericInlineClass|_#new#tearOff::T% */
   return self::GenericInlineClass|<self::GenericInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
+static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> /* = self::GenericInlineClass|test::T% */ #this, self::GenericInlineClass|test::T% t) → void {
   self::GenericInlineClass|test::T% a1 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   self::GenericInlineClass|test::T% a2 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:26:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T'.
@@ -391,15 +391,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = t; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = t;
 }
-static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
+static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> /* = self::GenericInlineClass|get#test::T% */ #this) → (self::GenericInlineClass|get#test::T%) → void
   return (self::GenericInlineClass|get#test::T% t) → void => self::GenericInlineClass|test<self::GenericInlineClass|get#test::T%>(#this, t);
-static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
-  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> #this = it;
+static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ {
+  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
+static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%> /* = () → self::FunctionInlineClass|_#new#tearOff::T% */
   return self::FunctionInlineClass|<self::FunctionInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
+static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> /* = () → self::FunctionInlineClass|test::T% */ #this, () → self::FunctionInlineClass|test::T% t) → void {
   () → self::FunctionInlineClass|test::T% a1 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   () → self::FunctionInlineClass|test::T% a2 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:37:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T Function()'.
@@ -423,15 +423,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   self::FunctionInlineClass|test::T% d3 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
   self::FunctionInlineClass|test::T% d4 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
 }
-static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
+static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> /* = () → self::FunctionInlineClass|get#test::T% */ #this) → (() → self::FunctionInlineClass|get#test::T%) → void
   return (() → self::FunctionInlineClass|get#test::T% t) → void => self::FunctionInlineClass|test<self::FunctionInlineClass|get#test::T%>(#this, t);
-static inline-class-member method GenericFunctionInlineClass|(dynamic it) → self::GenericFunctionInlineClass {
-  lowered final self::GenericFunctionInlineClass #this = it;
+static inline-class-member method GenericFunctionInlineClass|(dynamic it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ {
+  lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(dynamic it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(dynamic it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */
   return self::GenericFunctionInlineClass|(it);
-static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
+static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → void {
   <T extends core::Object? = dynamic>() → T% a1 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   <T extends core::Object? = dynamic>() → T% a2 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   () → core::int a3 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>;
@@ -459,15 +459,15 @@ Try correcting the name to the name of an existing getter, or defining a getter
   core::int e1 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
   core::int e2 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
 }
-static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
+static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → () → void
   return () → void => self::GenericFunctionInlineClass|test(#this);
-static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
-  lowered final self::DynamicInlineClass #this = it;
+static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass /* = dynamic */ {
+  lowered final self::DynamicInlineClass /* = dynamic */ #this = it;
   return #this;
 }
-static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass /* = dynamic */
   return self::DynamicInlineClass|(it);
-static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
+static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → void {
   dynamic a1 = #this as{Unchecked} dynamic;
   dynamic a2 = #this as{Unchecked} dynamic;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:72:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
@@ -491,15 +491,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   dynamic d3 = (#this as{Unchecked} dynamic){dynamic}.call();
   dynamic d4 = (#this as{Unchecked} dynamic){dynamic}.call();
 }
-static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
+static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → () → void
   return () → void => self::DynamicInlineClass|test(#this);
-static inline-class-member method ErroneousInlineClass|(dynamic a, dynamic b) → self::ErroneousInlineClass {
-  lowered final self::ErroneousInlineClass #this = b;
+static inline-class-member method ErroneousInlineClass|(dynamic a, dynamic b) → self::ErroneousInlineClass /* = core::int */ {
+  lowered final self::ErroneousInlineClass /* = core::int */ #this = b;
   return #this;
 }
-static inline-class-member method ErroneousInlineClass|_#new#tearOff(dynamic a, dynamic b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|_#new#tearOff(dynamic a, dynamic b) → self::ErroneousInlineClass /* = core::int */
   return self::ErroneousInlineClass|(a, b);
-static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
+static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   dynamic a3 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:87:19: Error: The getter 'b' isn't defined for the class 'ErroneousInlineClass'.
@@ -575,9 +575,9 @@ Try correcting the name to the name of an existing getter, or defining a getter
     var e4 = b.call(); // Error
              ^" in #this{<unresolved>}.b{dynamic}.call();
 }
-static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
+static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → () → void
   return () → void => self::ErroneousInlineClass|test(#this);
-static method test(self::InlineClass inlineClass, self::GenericInlineClass<core::String> genericInlineClass, self::FunctionInlineClass<core::String> functionInlineClass, self::GenericFunctionInlineClass genericFunctionInlineClass, self::DynamicInlineClass dynamicInlineClass, self::ErroneousInlineClass erroneousInlineClass, #lib1::PrivateInlineClass privateInlineClass) → void {
+static method test(self::InlineClass /* = core::int */ inlineClass, self::GenericInlineClass<core::String> /* = core::String */ genericInlineClass, self::FunctionInlineClass<core::String> /* = () → core::String */ functionInlineClass, self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ genericFunctionInlineClass, self::DynamicInlineClass /* = dynamic */ dynamicInlineClass, self::ErroneousInlineClass /* = core::int */ erroneousInlineClass, #lib1::PrivateInlineClass /* = core::int */ privateInlineClass) → void {
   core::int a1 = inlineClass as{Unchecked} core::int;
   invalid-type a2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access.dart:118:26: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
 Try changing the operand or remove the type arguments.
@@ -694,13 +694,13 @@ extension type PrivateInlineClass(core::int _it) {
   constructor • = self2::PrivateInlineClass|;
   tearoff • = self2::PrivateInlineClass|_#new#tearOff;
 }
-static inline-class-member method PrivateInlineClass|(dynamic _it) → self2::PrivateInlineClass {
-  lowered final self2::PrivateInlineClass #this = _it;
+static inline-class-member method PrivateInlineClass|(dynamic _it) → self2::PrivateInlineClass /* = core::int */ {
+  lowered final self2::PrivateInlineClass /* = core::int */ #this = _it;
   return #this;
 }
-static inline-class-member method PrivateInlineClass|_#new#tearOff(dynamic _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|_#new#tearOff(dynamic _it) → self2::PrivateInlineClass /* = core::int */
   return self2::PrivateInlineClass|(_it);
-static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
+static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/field_access_lib.dart:9:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -720,5 +720,5 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = _it = 42; // Error, should not resolve to extension method.
              ^^^" in #this{<unresolved>}._it = 42;
 }
-static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
+static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → () → void
   return () → void => self2::PrivateInlineClass|test(#this);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.strong.expect
index d228260192a..05d1aa971d5 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.strong.expect
@@ -15,7 +15,7 @@ import "dart:core" as core;
 import "org-dartlang-testcase:///main_lib2.dart";
 
 static method main() → dynamic {
-  mai2::ExtensionType e1 = mai2::ExtensionType|(42);
+  mai2::ExtensionType /* = core::int */ e1 = mai2::ExtensionType|(42);
   mai::expect(42, mai2::ExtensionType|instanceMethod(e1));
   mai::expect(42, mai2::ExtensionType|get#instanceMethod(e1)(){() → core::int});
   mai::expect(43, mai2::ExtensionType|+(e1, 1));
@@ -29,15 +29,15 @@ static method main() → dynamic {
   mai2::ExtensionType|staticSetter = 124;
   mai::expect(124, mai2::ExtensionType|staticField);
   mai::expect(124, mai2::ExtensionType|staticGetter);
-  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType});
+  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType /* = core::int */});
   mai::expect(43, mai2::ExtensionType|named(42));
-  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType});
+  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(44, mai2::ExtensionType|redirectingGenerative(42));
-  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType});
+  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(45, mai2::ExtensionType|fact(42));
-  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType});
+  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(42, mai2::ExtensionType|(42));
-  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType});
+  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType /* = core::int */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
@@ -70,42 +70,42 @@ extension type ExtensionType(core::int it) {
   static tearoff redirectingFactory = mai2::ExtensionType|_#redirectingFactory#tearOff;
 }
 static field core::int ExtensionType|staticField = 123;
-static inline-class-member method ExtensionType|(dynamic it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this = it;
+static inline-class-member method ExtensionType|(dynamic it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|named(core::int it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this = it.{core::num::+}(1){(core::num) → core::int};
+static inline-class-member method ExtensionType|named(core::int it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|named(it);
-static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this;
+static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this;
   #this = mai2::ExtensionType|(it.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|redirectingGenerative(it);
-static inline-class-member method ExtensionType|fact(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|fact(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it.{core::num::+}(3){(core::num) → core::int});
-static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|fact(it);
-static inline-class-member method ExtensionType|redirectingFactory(core::int it) → mai2::ExtensionType /* redirection-target: mai2::ExtensionType| */
+static inline-class-member method ExtensionType|redirectingFactory(core::int it) → mai2::ExtensionType /* = core::int */ /* redirection-target: mai2::ExtensionType| */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|instanceMethod(lowered final mai2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|instanceMethod(lowered final mai2::ExtensionType /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType|get#instanceMethod(lowered final mai2::ExtensionType #this) → () → core::int
+static inline-class-member method ExtensionType|get#instanceMethod(lowered final mai2::ExtensionType /* = core::int */ #this) → () → core::int
   return () → core::int => mai2::ExtensionType|instanceMethod(#this);
-static inline-class-member method ExtensionType|+(lowered final mai2::ExtensionType #this, core::int i) → core::int
+static inline-class-member method ExtensionType|+(lowered final mai2::ExtensionType /* = core::int */ #this, core::int i) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(i){(core::num) → core::int};
-static inline-class-member method ExtensionType|get#instanceGetter(lowered final mai2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|get#instanceGetter(lowered final mai2::ExtensionType /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType|set#instanceSetter(lowered final mai2::ExtensionType #this, core::int value) → void {}
+static inline-class-member method ExtensionType|set#instanceSetter(lowered final mai2::ExtensionType /* = core::int */ #this, core::int value) → void {}
 static inline-class-member method ExtensionType|staticMethod() → core::int
   return 87;
 static inline-class-member get ExtensionType|staticGetter() → core::int
diff --git a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.strong.transformed.expect
index d228260192a..05d1aa971d5 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.strong.transformed.expect
@@ -15,7 +15,7 @@ import "dart:core" as core;
 import "org-dartlang-testcase:///main_lib2.dart";
 
 static method main() → dynamic {
-  mai2::ExtensionType e1 = mai2::ExtensionType|(42);
+  mai2::ExtensionType /* = core::int */ e1 = mai2::ExtensionType|(42);
   mai::expect(42, mai2::ExtensionType|instanceMethod(e1));
   mai::expect(42, mai2::ExtensionType|get#instanceMethod(e1)(){() → core::int});
   mai::expect(43, mai2::ExtensionType|+(e1, 1));
@@ -29,15 +29,15 @@ static method main() → dynamic {
   mai2::ExtensionType|staticSetter = 124;
   mai::expect(124, mai2::ExtensionType|staticField);
   mai::expect(124, mai2::ExtensionType|staticGetter);
-  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType});
+  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType /* = core::int */});
   mai::expect(43, mai2::ExtensionType|named(42));
-  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType});
+  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(44, mai2::ExtensionType|redirectingGenerative(42));
-  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType});
+  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(45, mai2::ExtensionType|fact(42));
-  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType});
+  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(42, mai2::ExtensionType|(42));
-  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType});
+  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType /* = core::int */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
@@ -70,42 +70,42 @@ extension type ExtensionType(core::int it) {
   static tearoff redirectingFactory = mai2::ExtensionType|_#redirectingFactory#tearOff;
 }
 static field core::int ExtensionType|staticField = 123;
-static inline-class-member method ExtensionType|(dynamic it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this = it;
+static inline-class-member method ExtensionType|(dynamic it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|named(core::int it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this = it.{core::num::+}(1){(core::num) → core::int};
+static inline-class-member method ExtensionType|named(core::int it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|named(it);
-static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this;
+static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this;
   #this = mai2::ExtensionType|(it.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|redirectingGenerative(it);
-static inline-class-member method ExtensionType|fact(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|fact(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it.{core::num::+}(3){(core::num) → core::int});
-static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|fact(it);
-static inline-class-member method ExtensionType|redirectingFactory(core::int it) → mai2::ExtensionType /* redirection-target: mai2::ExtensionType| */
+static inline-class-member method ExtensionType|redirectingFactory(core::int it) → mai2::ExtensionType /* = core::int */ /* redirection-target: mai2::ExtensionType| */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|instanceMethod(lowered final mai2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|instanceMethod(lowered final mai2::ExtensionType /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType|get#instanceMethod(lowered final mai2::ExtensionType #this) → () → core::int
+static inline-class-member method ExtensionType|get#instanceMethod(lowered final mai2::ExtensionType /* = core::int */ #this) → () → core::int
   return () → core::int => mai2::ExtensionType|instanceMethod(#this);
-static inline-class-member method ExtensionType|+(lowered final mai2::ExtensionType #this, core::int i) → core::int
+static inline-class-member method ExtensionType|+(lowered final mai2::ExtensionType /* = core::int */ #this, core::int i) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(i){(core::num) → core::int};
-static inline-class-member method ExtensionType|get#instanceGetter(lowered final mai2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|get#instanceGetter(lowered final mai2::ExtensionType /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType|set#instanceSetter(lowered final mai2::ExtensionType #this, core::int value) → void {}
+static inline-class-member method ExtensionType|set#instanceSetter(lowered final mai2::ExtensionType /* = core::int */ #this, core::int value) → void {}
 static inline-class-member method ExtensionType|staticMethod() → core::int
   return 87;
 static inline-class-member get ExtensionType|staticGetter() → core::int
diff --git a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.weak.expect
index d228260192a..05d1aa971d5 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.weak.expect
@@ -15,7 +15,7 @@ import "dart:core" as core;
 import "org-dartlang-testcase:///main_lib2.dart";
 
 static method main() → dynamic {
-  mai2::ExtensionType e1 = mai2::ExtensionType|(42);
+  mai2::ExtensionType /* = core::int */ e1 = mai2::ExtensionType|(42);
   mai::expect(42, mai2::ExtensionType|instanceMethod(e1));
   mai::expect(42, mai2::ExtensionType|get#instanceMethod(e1)(){() → core::int});
   mai::expect(43, mai2::ExtensionType|+(e1, 1));
@@ -29,15 +29,15 @@ static method main() → dynamic {
   mai2::ExtensionType|staticSetter = 124;
   mai::expect(124, mai2::ExtensionType|staticField);
   mai::expect(124, mai2::ExtensionType|staticGetter);
-  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType});
+  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType /* = core::int */});
   mai::expect(43, mai2::ExtensionType|named(42));
-  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType});
+  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(44, mai2::ExtensionType|redirectingGenerative(42));
-  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType});
+  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(45, mai2::ExtensionType|fact(42));
-  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType});
+  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(42, mai2::ExtensionType|(42));
-  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType});
+  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType /* = core::int */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
@@ -70,42 +70,42 @@ extension type ExtensionType(core::int it) {
   static tearoff redirectingFactory = mai2::ExtensionType|_#redirectingFactory#tearOff;
 }
 static field core::int ExtensionType|staticField = 123;
-static inline-class-member method ExtensionType|(dynamic it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this = it;
+static inline-class-member method ExtensionType|(dynamic it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|named(core::int it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this = it.{core::num::+}(1){(core::num) → core::int};
+static inline-class-member method ExtensionType|named(core::int it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|named(it);
-static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this;
+static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this;
   #this = mai2::ExtensionType|(it.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|redirectingGenerative(it);
-static inline-class-member method ExtensionType|fact(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|fact(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it.{core::num::+}(3){(core::num) → core::int});
-static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|fact(it);
-static inline-class-member method ExtensionType|redirectingFactory(core::int it) → mai2::ExtensionType /* redirection-target: mai2::ExtensionType| */
+static inline-class-member method ExtensionType|redirectingFactory(core::int it) → mai2::ExtensionType /* = core::int */ /* redirection-target: mai2::ExtensionType| */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|instanceMethod(lowered final mai2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|instanceMethod(lowered final mai2::ExtensionType /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType|get#instanceMethod(lowered final mai2::ExtensionType #this) → () → core::int
+static inline-class-member method ExtensionType|get#instanceMethod(lowered final mai2::ExtensionType /* = core::int */ #this) → () → core::int
   return () → core::int => mai2::ExtensionType|instanceMethod(#this);
-static inline-class-member method ExtensionType|+(lowered final mai2::ExtensionType #this, core::int i) → core::int
+static inline-class-member method ExtensionType|+(lowered final mai2::ExtensionType /* = core::int */ #this, core::int i) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(i){(core::num) → core::int};
-static inline-class-member method ExtensionType|get#instanceGetter(lowered final mai2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|get#instanceGetter(lowered final mai2::ExtensionType /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType|set#instanceSetter(lowered final mai2::ExtensionType #this, core::int value) → void {}
+static inline-class-member method ExtensionType|set#instanceSetter(lowered final mai2::ExtensionType /* = core::int */ #this, core::int value) → void {}
 static inline-class-member method ExtensionType|staticMethod() → core::int
   return 87;
 static inline-class-member get ExtensionType|staticGetter() → core::int
diff --git a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.weak.modular.expect
index 668167a0fa3..d1413afe988 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.weak.modular.expect
@@ -15,7 +15,7 @@ import "dart:core" as core;
 import "org-dartlang-testcase:///main_lib2.dart";
 
 static method main() → dynamic {
-  mai2::ExtensionType e1 = mai2::ExtensionType|(42);
+  mai2::ExtensionType /* = core::int */ e1 = mai2::ExtensionType|(42);
   mai::expect(42, mai2::ExtensionType|instanceMethod(e1));
   mai::expect(42, mai2::ExtensionType|get#instanceMethod(e1)(){() → core::int});
   mai::expect(43, mai2::ExtensionType|+(e1, 1));
@@ -29,15 +29,15 @@ static method main() → dynamic {
   mai2::ExtensionType|staticSetter = 124;
   mai::expect(124, mai2::ExtensionType|staticField);
   mai::expect(124, mai2::ExtensionType|staticGetter);
-  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType});
+  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType /* = core::int */});
   mai::expect(43, mai2::ExtensionType|named(42));
-  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType});
+  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(44, mai2::ExtensionType|redirectingGenerative(42));
-  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType});
+  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(45, mai2::ExtensionType|fact(42));
-  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType});
+  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(42, mai2::ExtensionType|(42));
-  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType});
+  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType /* = core::int */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.weak.outline.expect
index 25bdee2cc53..c4384a426c5 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.weak.outline.expect
@@ -43,35 +43,35 @@ extension type ExtensionType(core::int it) {
   static tearoff redirectingFactory = self2::ExtensionType|_#redirectingFactory#tearOff;
 }
 static field core::int ExtensionType|staticField;
-static inline-class-member method ExtensionType|(dynamic it) → self2::ExtensionType
+static inline-class-member method ExtensionType|(dynamic it) → self2::ExtensionType /* = core::int */
   ;
-static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → self2::ExtensionType
+static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → self2::ExtensionType /* = core::int */
   return self2::ExtensionType|(it);
-static inline-class-member method ExtensionType|named(core::int it) → self2::ExtensionType
+static inline-class-member method ExtensionType|named(core::int it) → self2::ExtensionType /* = core::int */
   ;
-static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → self2::ExtensionType
+static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → self2::ExtensionType /* = core::int */
   return self2::ExtensionType|named(it);
-static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → self2::ExtensionType
+static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → self2::ExtensionType /* = core::int */
   ;
-static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → self2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → self2::ExtensionType /* = core::int */
   return self2::ExtensionType|redirectingGenerative(it);
-static inline-class-member method ExtensionType|fact(core::int it) → self2::ExtensionType
+static inline-class-member method ExtensionType|fact(core::int it) → self2::ExtensionType /* = core::int */
   ;
-static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → self2::ExtensionType
+static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → self2::ExtensionType /* = core::int */
   return self2::ExtensionType|fact(it);
-static inline-class-member method ExtensionType|redirectingFactory(core::int it) → self2::ExtensionType /* redirection-target: self2::ExtensionType| */
+static inline-class-member method ExtensionType|redirectingFactory(core::int it) → self2::ExtensionType /* = core::int */ /* redirection-target: self2::ExtensionType| */
   return self2::ExtensionType|(it);
-static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → self2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → self2::ExtensionType /* = core::int */
   return self2::ExtensionType|(it);
-static inline-class-member method ExtensionType|instanceMethod(lowered final self2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|instanceMethod(lowered final self2::ExtensionType /* = core::int */ #this) → core::int
   ;
-static inline-class-member method ExtensionType|get#instanceMethod(lowered final self2::ExtensionType #this) → () → core::int
+static inline-class-member method ExtensionType|get#instanceMethod(lowered final self2::ExtensionType /* = core::int */ #this) → () → core::int
   return () → core::int => self2::ExtensionType|instanceMethod(#this);
-static inline-class-member method ExtensionType|+(lowered final self2::ExtensionType #this, core::int i) → core::int
+static inline-class-member method ExtensionType|+(lowered final self2::ExtensionType /* = core::int */ #this, core::int i) → core::int
   ;
-static inline-class-member method ExtensionType|get#instanceGetter(lowered final self2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|get#instanceGetter(lowered final self2::ExtensionType /* = core::int */ #this) → core::int
   ;
-static inline-class-member method ExtensionType|set#instanceSetter(lowered final self2::ExtensionType #this, core::int value) → void
+static inline-class-member method ExtensionType|set#instanceSetter(lowered final self2::ExtensionType /* = core::int */ #this, core::int value) → void
   ;
 static inline-class-member method ExtensionType|staticMethod() → core::int
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.weak.transformed.expect
index d228260192a..05d1aa971d5 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.dart.weak.transformed.expect
@@ -15,7 +15,7 @@ import "dart:core" as core;
 import "org-dartlang-testcase:///main_lib2.dart";
 
 static method main() → dynamic {
-  mai2::ExtensionType e1 = mai2::ExtensionType|(42);
+  mai2::ExtensionType /* = core::int */ e1 = mai2::ExtensionType|(42);
   mai::expect(42, mai2::ExtensionType|instanceMethod(e1));
   mai::expect(42, mai2::ExtensionType|get#instanceMethod(e1)(){() → core::int});
   mai::expect(43, mai2::ExtensionType|+(e1, 1));
@@ -29,15 +29,15 @@ static method main() → dynamic {
   mai2::ExtensionType|staticSetter = 124;
   mai::expect(124, mai2::ExtensionType|staticField);
   mai::expect(124, mai2::ExtensionType|staticGetter);
-  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType});
+  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType /* = core::int */});
   mai::expect(43, mai2::ExtensionType|named(42));
-  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType});
+  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(44, mai2::ExtensionType|redirectingGenerative(42));
-  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType});
+  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(45, mai2::ExtensionType|fact(42));
-  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType});
+  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(42, mai2::ExtensionType|(42));
-  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType});
+  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType /* = core::int */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
@@ -70,42 +70,42 @@ extension type ExtensionType(core::int it) {
   static tearoff redirectingFactory = mai2::ExtensionType|_#redirectingFactory#tearOff;
 }
 static field core::int ExtensionType|staticField = 123;
-static inline-class-member method ExtensionType|(dynamic it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this = it;
+static inline-class-member method ExtensionType|(dynamic it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|named(core::int it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this = it.{core::num::+}(1){(core::num) → core::int};
+static inline-class-member method ExtensionType|named(core::int it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|named(it);
-static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this;
+static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this;
   #this = mai2::ExtensionType|(it.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|redirectingGenerative(it);
-static inline-class-member method ExtensionType|fact(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|fact(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it.{core::num::+}(3){(core::num) → core::int});
-static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|fact(it);
-static inline-class-member method ExtensionType|redirectingFactory(core::int it) → mai2::ExtensionType /* redirection-target: mai2::ExtensionType| */
+static inline-class-member method ExtensionType|redirectingFactory(core::int it) → mai2::ExtensionType /* = core::int */ /* redirection-target: mai2::ExtensionType| */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|instanceMethod(lowered final mai2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|instanceMethod(lowered final mai2::ExtensionType /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType|get#instanceMethod(lowered final mai2::ExtensionType #this) → () → core::int
+static inline-class-member method ExtensionType|get#instanceMethod(lowered final mai2::ExtensionType /* = core::int */ #this) → () → core::int
   return () → core::int => mai2::ExtensionType|instanceMethod(#this);
-static inline-class-member method ExtensionType|+(lowered final mai2::ExtensionType #this, core::int i) → core::int
+static inline-class-member method ExtensionType|+(lowered final mai2::ExtensionType /* = core::int */ #this, core::int i) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(i){(core::num) → core::int};
-static inline-class-member method ExtensionType|get#instanceGetter(lowered final mai2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|get#instanceGetter(lowered final mai2::ExtensionType /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType|set#instanceSetter(lowered final mai2::ExtensionType #this, core::int value) → void {}
+static inline-class-member method ExtensionType|set#instanceSetter(lowered final mai2::ExtensionType /* = core::int */ #this, core::int value) → void {}
 static inline-class-member method ExtensionType|staticMethod() → core::int
   return 87;
 static inline-class-member get ExtensionType|staticGetter() → core::int
diff --git a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.strong.expect
index d228260192a..05d1aa971d5 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.strong.expect
@@ -15,7 +15,7 @@ import "dart:core" as core;
 import "org-dartlang-testcase:///main_lib2.dart";
 
 static method main() → dynamic {
-  mai2::ExtensionType e1 = mai2::ExtensionType|(42);
+  mai2::ExtensionType /* = core::int */ e1 = mai2::ExtensionType|(42);
   mai::expect(42, mai2::ExtensionType|instanceMethod(e1));
   mai::expect(42, mai2::ExtensionType|get#instanceMethod(e1)(){() → core::int});
   mai::expect(43, mai2::ExtensionType|+(e1, 1));
@@ -29,15 +29,15 @@ static method main() → dynamic {
   mai2::ExtensionType|staticSetter = 124;
   mai::expect(124, mai2::ExtensionType|staticField);
   mai::expect(124, mai2::ExtensionType|staticGetter);
-  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType});
+  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType /* = core::int */});
   mai::expect(43, mai2::ExtensionType|named(42));
-  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType});
+  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(44, mai2::ExtensionType|redirectingGenerative(42));
-  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType});
+  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(45, mai2::ExtensionType|fact(42));
-  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType});
+  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(42, mai2::ExtensionType|(42));
-  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType});
+  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType /* = core::int */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
@@ -70,42 +70,42 @@ extension type ExtensionType(core::int it) {
   static tearoff redirectingFactory = mai2::ExtensionType|_#redirectingFactory#tearOff;
 }
 static field core::int ExtensionType|staticField = 123;
-static inline-class-member method ExtensionType|(dynamic it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this = it;
+static inline-class-member method ExtensionType|(dynamic it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|named(core::int it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this = it.{core::num::+}(1){(core::num) → core::int};
+static inline-class-member method ExtensionType|named(core::int it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|named(it);
-static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this;
+static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this;
   #this = mai2::ExtensionType|(it.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|redirectingGenerative(it);
-static inline-class-member method ExtensionType|fact(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|fact(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it.{core::num::+}(3){(core::num) → core::int});
-static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|fact(it);
-static inline-class-member method ExtensionType|redirectingFactory(core::int it) → mai2::ExtensionType /* redirection-target: mai2::ExtensionType| */
+static inline-class-member method ExtensionType|redirectingFactory(core::int it) → mai2::ExtensionType /* = core::int */ /* redirection-target: mai2::ExtensionType| */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|instanceMethod(lowered final mai2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|instanceMethod(lowered final mai2::ExtensionType /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType|get#instanceMethod(lowered final mai2::ExtensionType #this) → () → core::int
+static inline-class-member method ExtensionType|get#instanceMethod(lowered final mai2::ExtensionType /* = core::int */ #this) → () → core::int
   return () → core::int => mai2::ExtensionType|instanceMethod(#this);
-static inline-class-member method ExtensionType|+(lowered final mai2::ExtensionType #this, core::int i) → core::int
+static inline-class-member method ExtensionType|+(lowered final mai2::ExtensionType /* = core::int */ #this, core::int i) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(i){(core::num) → core::int};
-static inline-class-member method ExtensionType|get#instanceGetter(lowered final mai2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|get#instanceGetter(lowered final mai2::ExtensionType /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType|set#instanceSetter(lowered final mai2::ExtensionType #this, core::int value) → void {}
+static inline-class-member method ExtensionType|set#instanceSetter(lowered final mai2::ExtensionType /* = core::int */ #this, core::int value) → void {}
 static inline-class-member method ExtensionType|staticMethod() → core::int
   return 87;
 static inline-class-member get ExtensionType|staticGetter() → core::int
diff --git a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.strong.transformed.expect
index d228260192a..05d1aa971d5 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.strong.transformed.expect
@@ -15,7 +15,7 @@ import "dart:core" as core;
 import "org-dartlang-testcase:///main_lib2.dart";
 
 static method main() → dynamic {
-  mai2::ExtensionType e1 = mai2::ExtensionType|(42);
+  mai2::ExtensionType /* = core::int */ e1 = mai2::ExtensionType|(42);
   mai::expect(42, mai2::ExtensionType|instanceMethod(e1));
   mai::expect(42, mai2::ExtensionType|get#instanceMethod(e1)(){() → core::int});
   mai::expect(43, mai2::ExtensionType|+(e1, 1));
@@ -29,15 +29,15 @@ static method main() → dynamic {
   mai2::ExtensionType|staticSetter = 124;
   mai::expect(124, mai2::ExtensionType|staticField);
   mai::expect(124, mai2::ExtensionType|staticGetter);
-  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType});
+  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType /* = core::int */});
   mai::expect(43, mai2::ExtensionType|named(42));
-  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType});
+  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(44, mai2::ExtensionType|redirectingGenerative(42));
-  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType});
+  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(45, mai2::ExtensionType|fact(42));
-  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType});
+  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(42, mai2::ExtensionType|(42));
-  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType});
+  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType /* = core::int */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
@@ -70,42 +70,42 @@ extension type ExtensionType(core::int it) {
   static tearoff redirectingFactory = mai2::ExtensionType|_#redirectingFactory#tearOff;
 }
 static field core::int ExtensionType|staticField = 123;
-static inline-class-member method ExtensionType|(dynamic it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this = it;
+static inline-class-member method ExtensionType|(dynamic it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|named(core::int it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this = it.{core::num::+}(1){(core::num) → core::int};
+static inline-class-member method ExtensionType|named(core::int it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|named(it);
-static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this;
+static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this;
   #this = mai2::ExtensionType|(it.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|redirectingGenerative(it);
-static inline-class-member method ExtensionType|fact(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|fact(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it.{core::num::+}(3){(core::num) → core::int});
-static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|fact(it);
-static inline-class-member method ExtensionType|redirectingFactory(core::int it) → mai2::ExtensionType /* redirection-target: mai2::ExtensionType| */
+static inline-class-member method ExtensionType|redirectingFactory(core::int it) → mai2::ExtensionType /* = core::int */ /* redirection-target: mai2::ExtensionType| */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|instanceMethod(lowered final mai2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|instanceMethod(lowered final mai2::ExtensionType /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType|get#instanceMethod(lowered final mai2::ExtensionType #this) → () → core::int
+static inline-class-member method ExtensionType|get#instanceMethod(lowered final mai2::ExtensionType /* = core::int */ #this) → () → core::int
   return () → core::int => mai2::ExtensionType|instanceMethod(#this);
-static inline-class-member method ExtensionType|+(lowered final mai2::ExtensionType #this, core::int i) → core::int
+static inline-class-member method ExtensionType|+(lowered final mai2::ExtensionType /* = core::int */ #this, core::int i) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(i){(core::num) → core::int};
-static inline-class-member method ExtensionType|get#instanceGetter(lowered final mai2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|get#instanceGetter(lowered final mai2::ExtensionType /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType|set#instanceSetter(lowered final mai2::ExtensionType #this, core::int value) → void {}
+static inline-class-member method ExtensionType|set#instanceSetter(lowered final mai2::ExtensionType /* = core::int */ #this, core::int value) → void {}
 static inline-class-member method ExtensionType|staticMethod() → core::int
   return 87;
 static inline-class-member get ExtensionType|staticGetter() → core::int
diff --git a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.weak.expect
index d228260192a..05d1aa971d5 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.weak.expect
@@ -15,7 +15,7 @@ import "dart:core" as core;
 import "org-dartlang-testcase:///main_lib2.dart";
 
 static method main() → dynamic {
-  mai2::ExtensionType e1 = mai2::ExtensionType|(42);
+  mai2::ExtensionType /* = core::int */ e1 = mai2::ExtensionType|(42);
   mai::expect(42, mai2::ExtensionType|instanceMethod(e1));
   mai::expect(42, mai2::ExtensionType|get#instanceMethod(e1)(){() → core::int});
   mai::expect(43, mai2::ExtensionType|+(e1, 1));
@@ -29,15 +29,15 @@ static method main() → dynamic {
   mai2::ExtensionType|staticSetter = 124;
   mai::expect(124, mai2::ExtensionType|staticField);
   mai::expect(124, mai2::ExtensionType|staticGetter);
-  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType});
+  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType /* = core::int */});
   mai::expect(43, mai2::ExtensionType|named(42));
-  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType});
+  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(44, mai2::ExtensionType|redirectingGenerative(42));
-  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType});
+  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(45, mai2::ExtensionType|fact(42));
-  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType});
+  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(42, mai2::ExtensionType|(42));
-  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType});
+  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType /* = core::int */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
@@ -70,42 +70,42 @@ extension type ExtensionType(core::int it) {
   static tearoff redirectingFactory = mai2::ExtensionType|_#redirectingFactory#tearOff;
 }
 static field core::int ExtensionType|staticField = 123;
-static inline-class-member method ExtensionType|(dynamic it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this = it;
+static inline-class-member method ExtensionType|(dynamic it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|named(core::int it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this = it.{core::num::+}(1){(core::num) → core::int};
+static inline-class-member method ExtensionType|named(core::int it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|named(it);
-static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this;
+static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this;
   #this = mai2::ExtensionType|(it.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|redirectingGenerative(it);
-static inline-class-member method ExtensionType|fact(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|fact(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it.{core::num::+}(3){(core::num) → core::int});
-static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|fact(it);
-static inline-class-member method ExtensionType|redirectingFactory(core::int it) → mai2::ExtensionType /* redirection-target: mai2::ExtensionType| */
+static inline-class-member method ExtensionType|redirectingFactory(core::int it) → mai2::ExtensionType /* = core::int */ /* redirection-target: mai2::ExtensionType| */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|instanceMethod(lowered final mai2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|instanceMethod(lowered final mai2::ExtensionType /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType|get#instanceMethod(lowered final mai2::ExtensionType #this) → () → core::int
+static inline-class-member method ExtensionType|get#instanceMethod(lowered final mai2::ExtensionType /* = core::int */ #this) → () → core::int
   return () → core::int => mai2::ExtensionType|instanceMethod(#this);
-static inline-class-member method ExtensionType|+(lowered final mai2::ExtensionType #this, core::int i) → core::int
+static inline-class-member method ExtensionType|+(lowered final mai2::ExtensionType /* = core::int */ #this, core::int i) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(i){(core::num) → core::int};
-static inline-class-member method ExtensionType|get#instanceGetter(lowered final mai2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|get#instanceGetter(lowered final mai2::ExtensionType /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType|set#instanceSetter(lowered final mai2::ExtensionType #this, core::int value) → void {}
+static inline-class-member method ExtensionType|set#instanceSetter(lowered final mai2::ExtensionType /* = core::int */ #this, core::int value) → void {}
 static inline-class-member method ExtensionType|staticMethod() → core::int
   return 87;
 static inline-class-member get ExtensionType|staticGetter() → core::int
diff --git a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.weak.modular.expect
index d228260192a..05d1aa971d5 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.weak.modular.expect
@@ -15,7 +15,7 @@ import "dart:core" as core;
 import "org-dartlang-testcase:///main_lib2.dart";
 
 static method main() → dynamic {
-  mai2::ExtensionType e1 = mai2::ExtensionType|(42);
+  mai2::ExtensionType /* = core::int */ e1 = mai2::ExtensionType|(42);
   mai::expect(42, mai2::ExtensionType|instanceMethod(e1));
   mai::expect(42, mai2::ExtensionType|get#instanceMethod(e1)(){() → core::int});
   mai::expect(43, mai2::ExtensionType|+(e1, 1));
@@ -29,15 +29,15 @@ static method main() → dynamic {
   mai2::ExtensionType|staticSetter = 124;
   mai::expect(124, mai2::ExtensionType|staticField);
   mai::expect(124, mai2::ExtensionType|staticGetter);
-  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType});
+  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType /* = core::int */});
   mai::expect(43, mai2::ExtensionType|named(42));
-  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType});
+  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(44, mai2::ExtensionType|redirectingGenerative(42));
-  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType});
+  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(45, mai2::ExtensionType|fact(42));
-  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType});
+  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(42, mai2::ExtensionType|(42));
-  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType});
+  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType /* = core::int */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
@@ -70,42 +70,42 @@ extension type ExtensionType(core::int it) {
   static tearoff redirectingFactory = mai2::ExtensionType|_#redirectingFactory#tearOff;
 }
 static field core::int ExtensionType|staticField = 123;
-static inline-class-member method ExtensionType|(dynamic it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this = it;
+static inline-class-member method ExtensionType|(dynamic it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|named(core::int it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this = it.{core::num::+}(1){(core::num) → core::int};
+static inline-class-member method ExtensionType|named(core::int it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|named(it);
-static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this;
+static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this;
   #this = mai2::ExtensionType|(it.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|redirectingGenerative(it);
-static inline-class-member method ExtensionType|fact(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|fact(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it.{core::num::+}(3){(core::num) → core::int});
-static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|fact(it);
-static inline-class-member method ExtensionType|redirectingFactory(core::int it) → mai2::ExtensionType /* redirection-target: mai2::ExtensionType| */
+static inline-class-member method ExtensionType|redirectingFactory(core::int it) → mai2::ExtensionType /* = core::int */ /* redirection-target: mai2::ExtensionType| */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|instanceMethod(lowered final mai2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|instanceMethod(lowered final mai2::ExtensionType /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType|get#instanceMethod(lowered final mai2::ExtensionType #this) → () → core::int
+static inline-class-member method ExtensionType|get#instanceMethod(lowered final mai2::ExtensionType /* = core::int */ #this) → () → core::int
   return () → core::int => mai2::ExtensionType|instanceMethod(#this);
-static inline-class-member method ExtensionType|+(lowered final mai2::ExtensionType #this, core::int i) → core::int
+static inline-class-member method ExtensionType|+(lowered final mai2::ExtensionType /* = core::int */ #this, core::int i) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(i){(core::num) → core::int};
-static inline-class-member method ExtensionType|get#instanceGetter(lowered final mai2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|get#instanceGetter(lowered final mai2::ExtensionType /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType|set#instanceSetter(lowered final mai2::ExtensionType #this, core::int value) → void {}
+static inline-class-member method ExtensionType|set#instanceSetter(lowered final mai2::ExtensionType /* = core::int */ #this, core::int value) → void {}
 static inline-class-member method ExtensionType|staticMethod() → core::int
   return 87;
 static inline-class-member get ExtensionType|staticGetter() → core::int
diff --git a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.weak.outline.expect
index 25bdee2cc53..c4384a426c5 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.weak.outline.expect
@@ -43,35 +43,35 @@ extension type ExtensionType(core::int it) {
   static tearoff redirectingFactory = self2::ExtensionType|_#redirectingFactory#tearOff;
 }
 static field core::int ExtensionType|staticField;
-static inline-class-member method ExtensionType|(dynamic it) → self2::ExtensionType
+static inline-class-member method ExtensionType|(dynamic it) → self2::ExtensionType /* = core::int */
   ;
-static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → self2::ExtensionType
+static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → self2::ExtensionType /* = core::int */
   return self2::ExtensionType|(it);
-static inline-class-member method ExtensionType|named(core::int it) → self2::ExtensionType
+static inline-class-member method ExtensionType|named(core::int it) → self2::ExtensionType /* = core::int */
   ;
-static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → self2::ExtensionType
+static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → self2::ExtensionType /* = core::int */
   return self2::ExtensionType|named(it);
-static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → self2::ExtensionType
+static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → self2::ExtensionType /* = core::int */
   ;
-static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → self2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → self2::ExtensionType /* = core::int */
   return self2::ExtensionType|redirectingGenerative(it);
-static inline-class-member method ExtensionType|fact(core::int it) → self2::ExtensionType
+static inline-class-member method ExtensionType|fact(core::int it) → self2::ExtensionType /* = core::int */
   ;
-static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → self2::ExtensionType
+static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → self2::ExtensionType /* = core::int */
   return self2::ExtensionType|fact(it);
-static inline-class-member method ExtensionType|redirectingFactory(core::int it) → self2::ExtensionType /* redirection-target: self2::ExtensionType| */
+static inline-class-member method ExtensionType|redirectingFactory(core::int it) → self2::ExtensionType /* = core::int */ /* redirection-target: self2::ExtensionType| */
   return self2::ExtensionType|(it);
-static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → self2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → self2::ExtensionType /* = core::int */
   return self2::ExtensionType|(it);
-static inline-class-member method ExtensionType|instanceMethod(lowered final self2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|instanceMethod(lowered final self2::ExtensionType /* = core::int */ #this) → core::int
   ;
-static inline-class-member method ExtensionType|get#instanceMethod(lowered final self2::ExtensionType #this) → () → core::int
+static inline-class-member method ExtensionType|get#instanceMethod(lowered final self2::ExtensionType /* = core::int */ #this) → () → core::int
   return () → core::int => self2::ExtensionType|instanceMethod(#this);
-static inline-class-member method ExtensionType|+(lowered final self2::ExtensionType #this, core::int i) → core::int
+static inline-class-member method ExtensionType|+(lowered final self2::ExtensionType /* = core::int */ #this, core::int i) → core::int
   ;
-static inline-class-member method ExtensionType|get#instanceGetter(lowered final self2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|get#instanceGetter(lowered final self2::ExtensionType /* = core::int */ #this) → core::int
   ;
-static inline-class-member method ExtensionType|set#instanceSetter(lowered final self2::ExtensionType #this, core::int value) → void
+static inline-class-member method ExtensionType|set#instanceSetter(lowered final self2::ExtensionType /* = core::int */ #this, core::int value) → void
   ;
 static inline-class-member method ExtensionType|staticMethod() → core::int
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.weak.transformed.expect
index d228260192a..05d1aa971d5 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/from_dill/main.no_link.dart.weak.transformed.expect
@@ -15,7 +15,7 @@ import "dart:core" as core;
 import "org-dartlang-testcase:///main_lib2.dart";
 
 static method main() → dynamic {
-  mai2::ExtensionType e1 = mai2::ExtensionType|(42);
+  mai2::ExtensionType /* = core::int */ e1 = mai2::ExtensionType|(42);
   mai::expect(42, mai2::ExtensionType|instanceMethod(e1));
   mai::expect(42, mai2::ExtensionType|get#instanceMethod(e1)(){() → core::int});
   mai::expect(43, mai2::ExtensionType|+(e1, 1));
@@ -29,15 +29,15 @@ static method main() → dynamic {
   mai2::ExtensionType|staticSetter = 124;
   mai::expect(124, mai2::ExtensionType|staticField);
   mai::expect(124, mai2::ExtensionType|staticGetter);
-  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType});
+  mai::expect(42, #C2(42){(dynamic) → mai2::ExtensionType /* = core::int */});
   mai::expect(43, mai2::ExtensionType|named(42));
-  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType});
+  mai::expect(43, #C3(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(44, mai2::ExtensionType|redirectingGenerative(42));
-  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType});
+  mai::expect(44, #C4(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(45, mai2::ExtensionType|fact(42));
-  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType});
+  mai::expect(45, #C5(42){(core::int) → mai2::ExtensionType /* = core::int */});
   mai::expect(42, mai2::ExtensionType|(42));
-  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType});
+  mai::expect(42, #C6(42){(core::int) → mai2::ExtensionType /* = core::int */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
@@ -70,42 +70,42 @@ extension type ExtensionType(core::int it) {
   static tearoff redirectingFactory = mai2::ExtensionType|_#redirectingFactory#tearOff;
 }
 static field core::int ExtensionType|staticField = 123;
-static inline-class-member method ExtensionType|(dynamic it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this = it;
+static inline-class-member method ExtensionType|(dynamic it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|named(core::int it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this = it.{core::num::+}(1){(core::num) → core::int};
+static inline-class-member method ExtensionType|named(core::int it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#named#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|named(it);
-static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → mai2::ExtensionType {
-  lowered final mai2::ExtensionType #this;
+static inline-class-member method ExtensionType|redirectingGenerative(core::int it) → mai2::ExtensionType /* = core::int */ {
+  lowered final mai2::ExtensionType /* = core::int */ #this;
   #this = mai2::ExtensionType|(it.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingGenerative#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|redirectingGenerative(it);
-static inline-class-member method ExtensionType|fact(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|fact(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it.{core::num::+}(3){(core::num) → core::int});
-static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#fact#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|fact(it);
-static inline-class-member method ExtensionType|redirectingFactory(core::int it) → mai2::ExtensionType /* redirection-target: mai2::ExtensionType| */
+static inline-class-member method ExtensionType|redirectingFactory(core::int it) → mai2::ExtensionType /* = core::int */ /* redirection-target: mai2::ExtensionType| */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → mai2::ExtensionType
+static inline-class-member method ExtensionType|_#redirectingFactory#tearOff(core::int it) → mai2::ExtensionType /* = core::int */
   return mai2::ExtensionType|(it);
-static inline-class-member method ExtensionType|instanceMethod(lowered final mai2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|instanceMethod(lowered final mai2::ExtensionType /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType|get#instanceMethod(lowered final mai2::ExtensionType #this) → () → core::int
+static inline-class-member method ExtensionType|get#instanceMethod(lowered final mai2::ExtensionType /* = core::int */ #this) → () → core::int
   return () → core::int => mai2::ExtensionType|instanceMethod(#this);
-static inline-class-member method ExtensionType|+(lowered final mai2::ExtensionType #this, core::int i) → core::int
+static inline-class-member method ExtensionType|+(lowered final mai2::ExtensionType /* = core::int */ #this, core::int i) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(i){(core::num) → core::int};
-static inline-class-member method ExtensionType|get#instanceGetter(lowered final mai2::ExtensionType #this) → core::int
+static inline-class-member method ExtensionType|get#instanceGetter(lowered final mai2::ExtensionType /* = core::int */ #this) → core::int
   return #this as{Unchecked} core::int;
-static inline-class-member method ExtensionType|set#instanceSetter(lowered final mai2::ExtensionType #this, core::int value) → void {}
+static inline-class-member method ExtensionType|set#instanceSetter(lowered final mai2::ExtensionType /* = core::int */ #this, core::int value) → void {}
 static inline-class-member method ExtensionType|staticMethod() → core::int
   return 87;
 static inline-class-member get ExtensionType|staticGetter() → core::int
diff --git a/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.strong.expect
index 3b8f74ab355..8205e714c17 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.strong.expect
@@ -16,9 +16,9 @@ extension type C(core::int i) { // from org-dartlang-testcase:///has_part_of_lib
   constructor • = has::C|;
   tearoff • = has::_#new#tearOff;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(dynamic i) → has::C {
-  lowered final has::C #this = i;
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(dynamic i) → has::C /* = core::int */ {
+  lowered final has::C /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(dynamic i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(dynamic i) → has::C /* = core::int */
   return has::C|(i);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.strong.transformed.expect
index 3b8f74ab355..8205e714c17 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.strong.transformed.expect
@@ -16,9 +16,9 @@ extension type C(core::int i) { // from org-dartlang-testcase:///has_part_of_lib
   constructor • = has::C|;
   tearoff • = has::_#new#tearOff;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(dynamic i) → has::C {
-  lowered final has::C #this = i;
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(dynamic i) → has::C /* = core::int */ {
+  lowered final has::C /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(dynamic i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(dynamic i) → has::C /* = core::int */
   return has::C|(i);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.weak.expect
index 3b8f74ab355..8205e714c17 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.weak.expect
@@ -16,9 +16,9 @@ extension type C(core::int i) { // from org-dartlang-testcase:///has_part_of_lib
   constructor • = has::C|;
   tearoff • = has::_#new#tearOff;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(dynamic i) → has::C {
-  lowered final has::C #this = i;
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(dynamic i) → has::C /* = core::int */ {
+  lowered final has::C /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(dynamic i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(dynamic i) → has::C /* = core::int */
   return has::C|(i);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.weak.modular.expect
index 3b8f74ab355..8205e714c17 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.weak.modular.expect
@@ -16,9 +16,9 @@ extension type C(core::int i) { // from org-dartlang-testcase:///has_part_of_lib
   constructor • = has::C|;
   tearoff • = has::_#new#tearOff;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(dynamic i) → has::C {
-  lowered final has::C #this = i;
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(dynamic i) → has::C /* = core::int */ {
+  lowered final has::C /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(dynamic i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(dynamic i) → has::C /* = core::int */
   return has::C|(i);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.weak.outline.expect
index c1792911a17..181c1bb8efe 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.weak.outline.expect
@@ -17,7 +17,7 @@ extension type C(core::int i) { // from org-dartlang-testcase:///has_part_of_lib
   constructor • = has::C|;
   tearoff • = has::_#new#tearOff;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(dynamic i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(dynamic i) → has::C /* = core::int */
   ;
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(dynamic i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(dynamic i) → has::C /* = core::int */
   return has::C|(i);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.weak.transformed.expect
index 3b8f74ab355..8205e714c17 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/has_export.dart.weak.transformed.expect
@@ -16,9 +16,9 @@ extension type C(core::int i) { // from org-dartlang-testcase:///has_part_of_lib
   constructor • = has::C|;
   tearoff • = has::_#new#tearOff;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(dynamic i) → has::C {
-  lowered final has::C #this = i;
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(dynamic i) → has::C /* = core::int */ {
+  lowered final has::C /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(dynamic i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(dynamic i) → has::C /* = core::int */
   return has::C|(i);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.strong.expect
index 0f251c09c8f..2df0ca39fcd 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.strong.expect
@@ -91,7 +91,7 @@ import "dart:async";
 typedef RecordType = (core::int, core::String);
 typedef FunctionType = () → void;
 typedef NullableInterfaceType = core::String?;
-typedef NullableExtensionType = self::ExtensionType?;
+typedef NullableExtensionType = self::ExtensionType? /* = core::int? */;
 typedef Alias = self::Class;
 typedef GenericAlias<T extends core::Object? = dynamic> = self::GenericClass<T%>;
 class Class extends core::Object {
@@ -154,7 +154,7 @@ extension type ET_NullableInterfaceType(core::String? it) {
   constructor • = self::ET_NullableInterfaceType|;
   tearoff • = self::ET_NullableInterfaceType|_#new#tearOff;
 }
-extension type ET_NullableExtensionType(self::ExtensionType? it) {
+extension type ET_NullableExtensionType(self::ExtensionType? /* = core::int? */ it) {
   constructor • = self::ET_NullableExtensionType|;
   tearoff • = self::ET_NullableExtensionType|_#new#tearOff;
 }
@@ -186,143 +186,143 @@ extension type ET_GenericAlias<T extends core::Object? = dynamic>(self::GenericC
   constructor • = self::ET_GenericAlias|;
   tearoff • = self::ET_GenericAlias|_#new#tearOff;
 }
-extension type ET_ExtensionType(self::ExtensionType it) implements self::ExtensionType {
+extension type ET_ExtensionType(self::ExtensionType /* = core::int */ it) implements self::ExtensionType /* = core::int */ {
   constructor • = self::ET_ExtensionType|;
   tearoff • = self::ET_ExtensionType|_#new#tearOff;
 }
-extension type ET_GenericExtensionType<T extends core::Object? = dynamic>(self::GenericExtensionType<T%> it) implements self::GenericExtensionType<T%> {
+extension type ET_GenericExtensionType<T extends core::Object? = dynamic>(self::GenericExtensionType<T%> /* = T% */ it) implements self::GenericExtensionType<T%> /* = T% */ {
   constructor • = self::ET_GenericExtensionType|;
   tearoff • = self::ET_GenericExtensionType|_#new#tearOff;
 }
-static inline-class-member method ExtensionType|(dynamic it) → self::ExtensionType {
-  lowered final self::ExtensionType #this = it;
+static inline-class-member method ExtensionType|(dynamic it) → self::ExtensionType /* = core::int */ {
+  lowered final self::ExtensionType /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → self::ExtensionType
+static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → self::ExtensionType /* = core::int */
   return self::ExtensionType|(it);
-static inline-class-member method GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|::T%> {
-  lowered final self::GenericExtensionType<self::GenericExtensionType|::T%> #this = it;
+static inline-class-member method GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|::T%> /* = self::GenericExtensionType|::T% */ {
+  lowered final self::GenericExtensionType<self::GenericExtensionType|::T%> /* = self::GenericExtensionType|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|_#new#tearOff::T%>
+static inline-class-member method GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|_#new#tearOff::T%> /* = self::GenericExtensionType|_#new#tearOff::T% */
   return self::GenericExtensionType|<self::GenericExtensionType|_#new#tearOff::T%>(it);
-static inline-class-member method ET_Null|(dynamic it) → self::ET_Null {
-  lowered final self::ET_Null #this = it;
+static inline-class-member method ET_Null|(dynamic it) → self::ET_Null /* = Null */ {
+  lowered final self::ET_Null /* = Null */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Null|_#new#tearOff(dynamic it) → self::ET_Null
+static inline-class-member method ET_Null|_#new#tearOff(dynamic it) → self::ET_Null /* = Null */
   return self::ET_Null|(it);
-static inline-class-member method ET_Dynamic|(dynamic it) → self::ET_Dynamic {
-  lowered final self::ET_Dynamic #this = it;
+static inline-class-member method ET_Dynamic|(dynamic it) → self::ET_Dynamic /* = dynamic */ {
+  lowered final self::ET_Dynamic /* = dynamic */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Dynamic|_#new#tearOff(dynamic it) → self::ET_Dynamic
+static inline-class-member method ET_Dynamic|_#new#tearOff(dynamic it) → self::ET_Dynamic /* = dynamic */
   return self::ET_Dynamic|(it);
-static inline-class-member method ET_Void|(dynamic it) → self::ET_Void {
-  lowered final self::ET_Void #this = it;
+static inline-class-member method ET_Void|(dynamic it) → self::ET_Void /* = Never */ {
+  lowered final self::ET_Void /* = Never */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Void|_#new#tearOff(dynamic it) → self::ET_Void
+static inline-class-member method ET_Void|_#new#tearOff(dynamic it) → self::ET_Void /* = Never */
   return self::ET_Void|(it);
-static inline-class-member method ET_Never|(dynamic it) → self::ET_Never {
-  lowered final self::ET_Never #this = it;
+static inline-class-member method ET_Never|(dynamic it) → self::ET_Never /* = Never */ {
+  lowered final self::ET_Never /* = Never */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Never|_#new#tearOff(dynamic it) → self::ET_Never
+static inline-class-member method ET_Never|_#new#tearOff(dynamic it) → self::ET_Never /* = Never */
   return self::ET_Never|(it);
-static inline-class-member method ET_Object|(dynamic it) → self::ET_Object {
-  lowered final self::ET_Object #this = it;
+static inline-class-member method ET_Object|(dynamic it) → self::ET_Object /* = core::Object */ {
+  lowered final self::ET_Object /* = core::Object */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Object|_#new#tearOff(dynamic it) → self::ET_Object
+static inline-class-member method ET_Object|_#new#tearOff(dynamic it) → self::ET_Object /* = core::Object */
   return self::ET_Object|(it);
-static inline-class-member method ET_Record|(dynamic it) → self::ET_Record {
-  lowered final self::ET_Record #this = it;
+static inline-class-member method ET_Record|(dynamic it) → self::ET_Record /* = core::Record */ {
+  lowered final self::ET_Record /* = core::Record */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Record|_#new#tearOff(dynamic it) → self::ET_Record
+static inline-class-member method ET_Record|_#new#tearOff(dynamic it) → self::ET_Record /* = core::Record */
   return self::ET_Record|(it);
-static inline-class-member method ET_RecordType|(dynamic it) → self::ET_RecordType {
-  lowered final self::ET_RecordType #this = it;
+static inline-class-member method ET_RecordType|(dynamic it) → self::ET_RecordType /* =(core::int, core::String) */ {
+  lowered final self::ET_RecordType /* =(core::int, core::String) */ #this = it;
   return #this;
 }
-static inline-class-member method ET_RecordType|_#new#tearOff(dynamic it) → self::ET_RecordType
+static inline-class-member method ET_RecordType|_#new#tearOff(dynamic it) → self::ET_RecordType /* =(core::int, core::String) */
   return self::ET_RecordType|(it);
-static inline-class-member method ET_Function|(dynamic it) → self::ET_Function {
-  lowered final self::ET_Function #this = it;
+static inline-class-member method ET_Function|(dynamic it) → self::ET_Function /* = core::Function */ {
+  lowered final self::ET_Function /* = core::Function */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Function|_#new#tearOff(dynamic it) → self::ET_Function
+static inline-class-member method ET_Function|_#new#tearOff(dynamic it) → self::ET_Function /* = core::Function */
   return self::ET_Function|(it);
-static inline-class-member method ET_FunctionType|(dynamic it) → self::ET_FunctionType {
-  lowered final self::ET_FunctionType #this = it;
+static inline-class-member method ET_FunctionType|(dynamic it) → self::ET_FunctionType /* = () → void */ {
+  lowered final self::ET_FunctionType /* = () → void */ #this = it;
   return #this;
 }
-static inline-class-member method ET_FunctionType|_#new#tearOff(dynamic it) → self::ET_FunctionType
+static inline-class-member method ET_FunctionType|_#new#tearOff(dynamic it) → self::ET_FunctionType /* = () → void */
   return self::ET_FunctionType|(it);
-static inline-class-member method ET_NullableInterfaceType|(dynamic it) → self::ET_NullableInterfaceType {
-  lowered final self::ET_NullableInterfaceType #this = it;
+static inline-class-member method ET_NullableInterfaceType|(dynamic it) → self::ET_NullableInterfaceType /* = core::String? */ {
+  lowered final self::ET_NullableInterfaceType /* = core::String? */ #this = it;
   return #this;
 }
-static inline-class-member method ET_NullableInterfaceType|_#new#tearOff(dynamic it) → self::ET_NullableInterfaceType
+static inline-class-member method ET_NullableInterfaceType|_#new#tearOff(dynamic it) → self::ET_NullableInterfaceType /* = core::String? */
   return self::ET_NullableInterfaceType|(it);
-static inline-class-member method ET_NullableExtensionType|(dynamic it) → self::ET_NullableExtensionType {
-  lowered final self::ET_NullableExtensionType #this = it;
+static inline-class-member method ET_NullableExtensionType|(dynamic it) → self::ET_NullableExtensionType /* = core::int? */ {
+  lowered final self::ET_NullableExtensionType /* = core::int? */ #this = it;
   return #this;
 }
-static inline-class-member method ET_NullableExtensionType|_#new#tearOff(dynamic it) → self::ET_NullableExtensionType
+static inline-class-member method ET_NullableExtensionType|_#new#tearOff(dynamic it) → self::ET_NullableExtensionType /* = core::int? */
   return self::ET_NullableExtensionType|(it);
-static inline-class-member method ET_FutureOr|(dynamic it) → self::ET_FutureOr {
-  lowered final self::ET_FutureOr #this = it;
+static inline-class-member method ET_FutureOr|(dynamic it) → self::ET_FutureOr /* = FutureOr<core::int>*/ {
+  lowered final self::ET_FutureOr /* = FutureOr<core::int>*/ #this = it;
   return #this;
 }
-static inline-class-member method ET_FutureOr|_#new#tearOff(dynamic it) → self::ET_FutureOr
+static inline-class-member method ET_FutureOr|_#new#tearOff(dynamic it) → self::ET_FutureOr /* = FutureOr<core::int>*/
   return self::ET_FutureOr|(it);
-static inline-class-member method ET_Extension|_#new#tearOff(dynamic it) → self::ET_Extension
+static inline-class-member method ET_Extension|_#new#tearOff(dynamic it) → self::ET_Extension /* = Never */
   return self::ET_Extension|(it);
-static inline-class-member method ET_Extension|(dynamic it) → self::ET_Extension {
-  lowered final self::ET_Extension #this = it;
+static inline-class-member method ET_Extension|(dynamic it) → self::ET_Extension /* = Never */ {
+  lowered final self::ET_Extension /* = Never */ #this = it;
   return #this;
 }
-static inline-class-member method ET_TypeVariable|<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|::T%> {
-  lowered final self::ET_TypeVariable<self::ET_TypeVariable|::T%> #this = it;
+static inline-class-member method ET_TypeVariable|<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|::T%> /* = self::ET_TypeVariable|::T% */ {
+  lowered final self::ET_TypeVariable<self::ET_TypeVariable|::T%> /* = self::ET_TypeVariable|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method ET_TypeVariable|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|_#new#tearOff::T%>
+static inline-class-member method ET_TypeVariable|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|_#new#tearOff::T%> /* = self::ET_TypeVariable|_#new#tearOff::T% */
   return self::ET_TypeVariable|<self::ET_TypeVariable|_#new#tearOff::T%>(it);
-static inline-class-member method ET_Class|(dynamic it) → self::ET_Class {
-  lowered final self::ET_Class #this = it;
+static inline-class-member method ET_Class|(dynamic it) → self::ET_Class /* = self::Class */ {
+  lowered final self::ET_Class /* = self::Class */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Class|_#new#tearOff(dynamic it) → self::ET_Class
+static inline-class-member method ET_Class|_#new#tearOff(dynamic it) → self::ET_Class /* = self::Class */
   return self::ET_Class|(it);
-static inline-class-member method ET_GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|::T%> {
-  lowered final self::ET_GenericClass<self::ET_GenericClass|::T%> #this = it;
+static inline-class-member method ET_GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|::T%> /* = self::GenericClass<self::ET_GenericClass|::T%> */ {
+  lowered final self::ET_GenericClass<self::ET_GenericClass|::T%> /* = self::GenericClass<self::ET_GenericClass|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method ET_GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|_#new#tearOff::T%>
+static inline-class-member method ET_GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|_#new#tearOff::T%> /* = self::GenericClass<self::ET_GenericClass|_#new#tearOff::T%> */
   return self::ET_GenericClass|<self::ET_GenericClass|_#new#tearOff::T%>(it);
-static inline-class-member method ET_Alias|(dynamic it) → self::ET_Alias {
-  lowered final self::ET_Alias #this = it;
+static inline-class-member method ET_Alias|(dynamic it) → self::ET_Alias /* = self::Class */ {
+  lowered final self::ET_Alias /* = self::Class */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Alias|_#new#tearOff(dynamic it) → self::ET_Alias
+static inline-class-member method ET_Alias|_#new#tearOff(dynamic it) → self::ET_Alias /* = self::Class */
   return self::ET_Alias|(it);
-static inline-class-member method ET_GenericAlias|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|::T%> {
-  lowered final self::ET_GenericAlias<self::ET_GenericAlias|::T%> #this = it;
+static inline-class-member method ET_GenericAlias|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|::T%> /* = self::GenericClass<self::ET_GenericAlias|::T%> */ {
+  lowered final self::ET_GenericAlias<self::ET_GenericAlias|::T%> /* = self::GenericClass<self::ET_GenericAlias|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method ET_GenericAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|_#new#tearOff::T%>
+static inline-class-member method ET_GenericAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|_#new#tearOff::T%> /* = self::GenericClass<self::ET_GenericAlias|_#new#tearOff::T%> */
   return self::ET_GenericAlias|<self::ET_GenericAlias|_#new#tearOff::T%>(it);
-static inline-class-member method ET_ExtensionType|(dynamic it) → self::ET_ExtensionType {
-  lowered final self::ET_ExtensionType #this = it;
+static inline-class-member method ET_ExtensionType|(dynamic it) → self::ET_ExtensionType /* = core::int */ {
+  lowered final self::ET_ExtensionType /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ET_ExtensionType|_#new#tearOff(dynamic it) → self::ET_ExtensionType
+static inline-class-member method ET_ExtensionType|_#new#tearOff(dynamic it) → self::ET_ExtensionType /* = core::int */
   return self::ET_ExtensionType|(it);
-static inline-class-member method ET_GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> {
-  lowered final self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> #this = it;
+static inline-class-member method ET_GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> /* = self::ET_GenericExtensionType|::T% */ {
+  lowered final self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> /* = self::ET_GenericExtensionType|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method ET_GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|_#new#tearOff::T%>
+static inline-class-member method ET_GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|_#new#tearOff::T%> /* = self::ET_GenericExtensionType|_#new#tearOff::T% */
   return self::ET_GenericExtensionType|<self::ET_GenericExtensionType|_#new#tearOff::T%>(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.strong.transformed.expect
index 0f251c09c8f..2df0ca39fcd 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.strong.transformed.expect
@@ -91,7 +91,7 @@ import "dart:async";
 typedef RecordType = (core::int, core::String);
 typedef FunctionType = () → void;
 typedef NullableInterfaceType = core::String?;
-typedef NullableExtensionType = self::ExtensionType?;
+typedef NullableExtensionType = self::ExtensionType? /* = core::int? */;
 typedef Alias = self::Class;
 typedef GenericAlias<T extends core::Object? = dynamic> = self::GenericClass<T%>;
 class Class extends core::Object {
@@ -154,7 +154,7 @@ extension type ET_NullableInterfaceType(core::String? it) {
   constructor • = self::ET_NullableInterfaceType|;
   tearoff • = self::ET_NullableInterfaceType|_#new#tearOff;
 }
-extension type ET_NullableExtensionType(self::ExtensionType? it) {
+extension type ET_NullableExtensionType(self::ExtensionType? /* = core::int? */ it) {
   constructor • = self::ET_NullableExtensionType|;
   tearoff • = self::ET_NullableExtensionType|_#new#tearOff;
 }
@@ -186,143 +186,143 @@ extension type ET_GenericAlias<T extends core::Object? = dynamic>(self::GenericC
   constructor • = self::ET_GenericAlias|;
   tearoff • = self::ET_GenericAlias|_#new#tearOff;
 }
-extension type ET_ExtensionType(self::ExtensionType it) implements self::ExtensionType {
+extension type ET_ExtensionType(self::ExtensionType /* = core::int */ it) implements self::ExtensionType /* = core::int */ {
   constructor • = self::ET_ExtensionType|;
   tearoff • = self::ET_ExtensionType|_#new#tearOff;
 }
-extension type ET_GenericExtensionType<T extends core::Object? = dynamic>(self::GenericExtensionType<T%> it) implements self::GenericExtensionType<T%> {
+extension type ET_GenericExtensionType<T extends core::Object? = dynamic>(self::GenericExtensionType<T%> /* = T% */ it) implements self::GenericExtensionType<T%> /* = T% */ {
   constructor • = self::ET_GenericExtensionType|;
   tearoff • = self::ET_GenericExtensionType|_#new#tearOff;
 }
-static inline-class-member method ExtensionType|(dynamic it) → self::ExtensionType {
-  lowered final self::ExtensionType #this = it;
+static inline-class-member method ExtensionType|(dynamic it) → self::ExtensionType /* = core::int */ {
+  lowered final self::ExtensionType /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → self::ExtensionType
+static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → self::ExtensionType /* = core::int */
   return self::ExtensionType|(it);
-static inline-class-member method GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|::T%> {
-  lowered final self::GenericExtensionType<self::GenericExtensionType|::T%> #this = it;
+static inline-class-member method GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|::T%> /* = self::GenericExtensionType|::T% */ {
+  lowered final self::GenericExtensionType<self::GenericExtensionType|::T%> /* = self::GenericExtensionType|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|_#new#tearOff::T%>
+static inline-class-member method GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|_#new#tearOff::T%> /* = self::GenericExtensionType|_#new#tearOff::T% */
   return self::GenericExtensionType|<self::GenericExtensionType|_#new#tearOff::T%>(it);
-static inline-class-member method ET_Null|(dynamic it) → self::ET_Null {
-  lowered final self::ET_Null #this = it;
+static inline-class-member method ET_Null|(dynamic it) → self::ET_Null /* = Null */ {
+  lowered final self::ET_Null /* = Null */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Null|_#new#tearOff(dynamic it) → self::ET_Null
+static inline-class-member method ET_Null|_#new#tearOff(dynamic it) → self::ET_Null /* = Null */
   return self::ET_Null|(it);
-static inline-class-member method ET_Dynamic|(dynamic it) → self::ET_Dynamic {
-  lowered final self::ET_Dynamic #this = it;
+static inline-class-member method ET_Dynamic|(dynamic it) → self::ET_Dynamic /* = dynamic */ {
+  lowered final self::ET_Dynamic /* = dynamic */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Dynamic|_#new#tearOff(dynamic it) → self::ET_Dynamic
+static inline-class-member method ET_Dynamic|_#new#tearOff(dynamic it) → self::ET_Dynamic /* = dynamic */
   return self::ET_Dynamic|(it);
-static inline-class-member method ET_Void|(dynamic it) → self::ET_Void {
-  lowered final self::ET_Void #this = it;
+static inline-class-member method ET_Void|(dynamic it) → self::ET_Void /* = Never */ {
+  lowered final self::ET_Void /* = Never */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Void|_#new#tearOff(dynamic it) → self::ET_Void
+static inline-class-member method ET_Void|_#new#tearOff(dynamic it) → self::ET_Void /* = Never */
   return self::ET_Void|(it);
-static inline-class-member method ET_Never|(dynamic it) → self::ET_Never {
-  lowered final self::ET_Never #this = it;
+static inline-class-member method ET_Never|(dynamic it) → self::ET_Never /* = Never */ {
+  lowered final self::ET_Never /* = Never */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Never|_#new#tearOff(dynamic it) → self::ET_Never
+static inline-class-member method ET_Never|_#new#tearOff(dynamic it) → self::ET_Never /* = Never */
   return self::ET_Never|(it);
-static inline-class-member method ET_Object|(dynamic it) → self::ET_Object {
-  lowered final self::ET_Object #this = it;
+static inline-class-member method ET_Object|(dynamic it) → self::ET_Object /* = core::Object */ {
+  lowered final self::ET_Object /* = core::Object */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Object|_#new#tearOff(dynamic it) → self::ET_Object
+static inline-class-member method ET_Object|_#new#tearOff(dynamic it) → self::ET_Object /* = core::Object */
   return self::ET_Object|(it);
-static inline-class-member method ET_Record|(dynamic it) → self::ET_Record {
-  lowered final self::ET_Record #this = it;
+static inline-class-member method ET_Record|(dynamic it) → self::ET_Record /* = core::Record */ {
+  lowered final self::ET_Record /* = core::Record */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Record|_#new#tearOff(dynamic it) → self::ET_Record
+static inline-class-member method ET_Record|_#new#tearOff(dynamic it) → self::ET_Record /* = core::Record */
   return self::ET_Record|(it);
-static inline-class-member method ET_RecordType|(dynamic it) → self::ET_RecordType {
-  lowered final self::ET_RecordType #this = it;
+static inline-class-member method ET_RecordType|(dynamic it) → self::ET_RecordType /* =(core::int, core::String) */ {
+  lowered final self::ET_RecordType /* =(core::int, core::String) */ #this = it;
   return #this;
 }
-static inline-class-member method ET_RecordType|_#new#tearOff(dynamic it) → self::ET_RecordType
+static inline-class-member method ET_RecordType|_#new#tearOff(dynamic it) → self::ET_RecordType /* =(core::int, core::String) */
   return self::ET_RecordType|(it);
-static inline-class-member method ET_Function|(dynamic it) → self::ET_Function {
-  lowered final self::ET_Function #this = it;
+static inline-class-member method ET_Function|(dynamic it) → self::ET_Function /* = core::Function */ {
+  lowered final self::ET_Function /* = core::Function */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Function|_#new#tearOff(dynamic it) → self::ET_Function
+static inline-class-member method ET_Function|_#new#tearOff(dynamic it) → self::ET_Function /* = core::Function */
   return self::ET_Function|(it);
-static inline-class-member method ET_FunctionType|(dynamic it) → self::ET_FunctionType {
-  lowered final self::ET_FunctionType #this = it;
+static inline-class-member method ET_FunctionType|(dynamic it) → self::ET_FunctionType /* = () → void */ {
+  lowered final self::ET_FunctionType /* = () → void */ #this = it;
   return #this;
 }
-static inline-class-member method ET_FunctionType|_#new#tearOff(dynamic it) → self::ET_FunctionType
+static inline-class-member method ET_FunctionType|_#new#tearOff(dynamic it) → self::ET_FunctionType /* = () → void */
   return self::ET_FunctionType|(it);
-static inline-class-member method ET_NullableInterfaceType|(dynamic it) → self::ET_NullableInterfaceType {
-  lowered final self::ET_NullableInterfaceType #this = it;
+static inline-class-member method ET_NullableInterfaceType|(dynamic it) → self::ET_NullableInterfaceType /* = core::String? */ {
+  lowered final self::ET_NullableInterfaceType /* = core::String? */ #this = it;
   return #this;
 }
-static inline-class-member method ET_NullableInterfaceType|_#new#tearOff(dynamic it) → self::ET_NullableInterfaceType
+static inline-class-member method ET_NullableInterfaceType|_#new#tearOff(dynamic it) → self::ET_NullableInterfaceType /* = core::String? */
   return self::ET_NullableInterfaceType|(it);
-static inline-class-member method ET_NullableExtensionType|(dynamic it) → self::ET_NullableExtensionType {
-  lowered final self::ET_NullableExtensionType #this = it;
+static inline-class-member method ET_NullableExtensionType|(dynamic it) → self::ET_NullableExtensionType /* = core::int? */ {
+  lowered final self::ET_NullableExtensionType /* = core::int? */ #this = it;
   return #this;
 }
-static inline-class-member method ET_NullableExtensionType|_#new#tearOff(dynamic it) → self::ET_NullableExtensionType
+static inline-class-member method ET_NullableExtensionType|_#new#tearOff(dynamic it) → self::ET_NullableExtensionType /* = core::int? */
   return self::ET_NullableExtensionType|(it);
-static inline-class-member method ET_FutureOr|(dynamic it) → self::ET_FutureOr {
-  lowered final self::ET_FutureOr #this = it;
+static inline-class-member method ET_FutureOr|(dynamic it) → self::ET_FutureOr /* = FutureOr<core::int>*/ {
+  lowered final self::ET_FutureOr /* = FutureOr<core::int>*/ #this = it;
   return #this;
 }
-static inline-class-member method ET_FutureOr|_#new#tearOff(dynamic it) → self::ET_FutureOr
+static inline-class-member method ET_FutureOr|_#new#tearOff(dynamic it) → self::ET_FutureOr /* = FutureOr<core::int>*/
   return self::ET_FutureOr|(it);
-static inline-class-member method ET_Extension|_#new#tearOff(dynamic it) → self::ET_Extension
+static inline-class-member method ET_Extension|_#new#tearOff(dynamic it) → self::ET_Extension /* = Never */
   return self::ET_Extension|(it);
-static inline-class-member method ET_Extension|(dynamic it) → self::ET_Extension {
-  lowered final self::ET_Extension #this = it;
+static inline-class-member method ET_Extension|(dynamic it) → self::ET_Extension /* = Never */ {
+  lowered final self::ET_Extension /* = Never */ #this = it;
   return #this;
 }
-static inline-class-member method ET_TypeVariable|<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|::T%> {
-  lowered final self::ET_TypeVariable<self::ET_TypeVariable|::T%> #this = it;
+static inline-class-member method ET_TypeVariable|<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|::T%> /* = self::ET_TypeVariable|::T% */ {
+  lowered final self::ET_TypeVariable<self::ET_TypeVariable|::T%> /* = self::ET_TypeVariable|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method ET_TypeVariable|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|_#new#tearOff::T%>
+static inline-class-member method ET_TypeVariable|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|_#new#tearOff::T%> /* = self::ET_TypeVariable|_#new#tearOff::T% */
   return self::ET_TypeVariable|<self::ET_TypeVariable|_#new#tearOff::T%>(it);
-static inline-class-member method ET_Class|(dynamic it) → self::ET_Class {
-  lowered final self::ET_Class #this = it;
+static inline-class-member method ET_Class|(dynamic it) → self::ET_Class /* = self::Class */ {
+  lowered final self::ET_Class /* = self::Class */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Class|_#new#tearOff(dynamic it) → self::ET_Class
+static inline-class-member method ET_Class|_#new#tearOff(dynamic it) → self::ET_Class /* = self::Class */
   return self::ET_Class|(it);
-static inline-class-member method ET_GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|::T%> {
-  lowered final self::ET_GenericClass<self::ET_GenericClass|::T%> #this = it;
+static inline-class-member method ET_GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|::T%> /* = self::GenericClass<self::ET_GenericClass|::T%> */ {
+  lowered final self::ET_GenericClass<self::ET_GenericClass|::T%> /* = self::GenericClass<self::ET_GenericClass|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method ET_GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|_#new#tearOff::T%>
+static inline-class-member method ET_GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|_#new#tearOff::T%> /* = self::GenericClass<self::ET_GenericClass|_#new#tearOff::T%> */
   return self::ET_GenericClass|<self::ET_GenericClass|_#new#tearOff::T%>(it);
-static inline-class-member method ET_Alias|(dynamic it) → self::ET_Alias {
-  lowered final self::ET_Alias #this = it;
+static inline-class-member method ET_Alias|(dynamic it) → self::ET_Alias /* = self::Class */ {
+  lowered final self::ET_Alias /* = self::Class */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Alias|_#new#tearOff(dynamic it) → self::ET_Alias
+static inline-class-member method ET_Alias|_#new#tearOff(dynamic it) → self::ET_Alias /* = self::Class */
   return self::ET_Alias|(it);
-static inline-class-member method ET_GenericAlias|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|::T%> {
-  lowered final self::ET_GenericAlias<self::ET_GenericAlias|::T%> #this = it;
+static inline-class-member method ET_GenericAlias|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|::T%> /* = self::GenericClass<self::ET_GenericAlias|::T%> */ {
+  lowered final self::ET_GenericAlias<self::ET_GenericAlias|::T%> /* = self::GenericClass<self::ET_GenericAlias|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method ET_GenericAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|_#new#tearOff::T%>
+static inline-class-member method ET_GenericAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|_#new#tearOff::T%> /* = self::GenericClass<self::ET_GenericAlias|_#new#tearOff::T%> */
   return self::ET_GenericAlias|<self::ET_GenericAlias|_#new#tearOff::T%>(it);
-static inline-class-member method ET_ExtensionType|(dynamic it) → self::ET_ExtensionType {
-  lowered final self::ET_ExtensionType #this = it;
+static inline-class-member method ET_ExtensionType|(dynamic it) → self::ET_ExtensionType /* = core::int */ {
+  lowered final self::ET_ExtensionType /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ET_ExtensionType|_#new#tearOff(dynamic it) → self::ET_ExtensionType
+static inline-class-member method ET_ExtensionType|_#new#tearOff(dynamic it) → self::ET_ExtensionType /* = core::int */
   return self::ET_ExtensionType|(it);
-static inline-class-member method ET_GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> {
-  lowered final self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> #this = it;
+static inline-class-member method ET_GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> /* = self::ET_GenericExtensionType|::T% */ {
+  lowered final self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> /* = self::ET_GenericExtensionType|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method ET_GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|_#new#tearOff::T%>
+static inline-class-member method ET_GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|_#new#tearOff::T%> /* = self::ET_GenericExtensionType|_#new#tearOff::T% */
   return self::ET_GenericExtensionType|<self::ET_GenericExtensionType|_#new#tearOff::T%>(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.weak.expect
index 0f251c09c8f..2df0ca39fcd 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.weak.expect
@@ -91,7 +91,7 @@ import "dart:async";
 typedef RecordType = (core::int, core::String);
 typedef FunctionType = () → void;
 typedef NullableInterfaceType = core::String?;
-typedef NullableExtensionType = self::ExtensionType?;
+typedef NullableExtensionType = self::ExtensionType? /* = core::int? */;
 typedef Alias = self::Class;
 typedef GenericAlias<T extends core::Object? = dynamic> = self::GenericClass<T%>;
 class Class extends core::Object {
@@ -154,7 +154,7 @@ extension type ET_NullableInterfaceType(core::String? it) {
   constructor • = self::ET_NullableInterfaceType|;
   tearoff • = self::ET_NullableInterfaceType|_#new#tearOff;
 }
-extension type ET_NullableExtensionType(self::ExtensionType? it) {
+extension type ET_NullableExtensionType(self::ExtensionType? /* = core::int? */ it) {
   constructor • = self::ET_NullableExtensionType|;
   tearoff • = self::ET_NullableExtensionType|_#new#tearOff;
 }
@@ -186,143 +186,143 @@ extension type ET_GenericAlias<T extends core::Object? = dynamic>(self::GenericC
   constructor • = self::ET_GenericAlias|;
   tearoff • = self::ET_GenericAlias|_#new#tearOff;
 }
-extension type ET_ExtensionType(self::ExtensionType it) implements self::ExtensionType {
+extension type ET_ExtensionType(self::ExtensionType /* = core::int */ it) implements self::ExtensionType /* = core::int */ {
   constructor • = self::ET_ExtensionType|;
   tearoff • = self::ET_ExtensionType|_#new#tearOff;
 }
-extension type ET_GenericExtensionType<T extends core::Object? = dynamic>(self::GenericExtensionType<T%> it) implements self::GenericExtensionType<T%> {
+extension type ET_GenericExtensionType<T extends core::Object? = dynamic>(self::GenericExtensionType<T%> /* = T% */ it) implements self::GenericExtensionType<T%> /* = T% */ {
   constructor • = self::ET_GenericExtensionType|;
   tearoff • = self::ET_GenericExtensionType|_#new#tearOff;
 }
-static inline-class-member method ExtensionType|(dynamic it) → self::ExtensionType {
-  lowered final self::ExtensionType #this = it;
+static inline-class-member method ExtensionType|(dynamic it) → self::ExtensionType /* = core::int */ {
+  lowered final self::ExtensionType /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → self::ExtensionType
+static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → self::ExtensionType /* = core::int */
   return self::ExtensionType|(it);
-static inline-class-member method GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|::T%> {
-  lowered final self::GenericExtensionType<self::GenericExtensionType|::T%> #this = it;
+static inline-class-member method GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|::T%> /* = self::GenericExtensionType|::T% */ {
+  lowered final self::GenericExtensionType<self::GenericExtensionType|::T%> /* = self::GenericExtensionType|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|_#new#tearOff::T%>
+static inline-class-member method GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|_#new#tearOff::T%> /* = self::GenericExtensionType|_#new#tearOff::T% */
   return self::GenericExtensionType|<self::GenericExtensionType|_#new#tearOff::T%>(it);
-static inline-class-member method ET_Null|(dynamic it) → self::ET_Null {
-  lowered final self::ET_Null #this = it;
+static inline-class-member method ET_Null|(dynamic it) → self::ET_Null /* = Null */ {
+  lowered final self::ET_Null /* = Null */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Null|_#new#tearOff(dynamic it) → self::ET_Null
+static inline-class-member method ET_Null|_#new#tearOff(dynamic it) → self::ET_Null /* = Null */
   return self::ET_Null|(it);
-static inline-class-member method ET_Dynamic|(dynamic it) → self::ET_Dynamic {
-  lowered final self::ET_Dynamic #this = it;
+static inline-class-member method ET_Dynamic|(dynamic it) → self::ET_Dynamic /* = dynamic */ {
+  lowered final self::ET_Dynamic /* = dynamic */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Dynamic|_#new#tearOff(dynamic it) → self::ET_Dynamic
+static inline-class-member method ET_Dynamic|_#new#tearOff(dynamic it) → self::ET_Dynamic /* = dynamic */
   return self::ET_Dynamic|(it);
-static inline-class-member method ET_Void|(dynamic it) → self::ET_Void {
-  lowered final self::ET_Void #this = it;
+static inline-class-member method ET_Void|(dynamic it) → self::ET_Void /* = Never */ {
+  lowered final self::ET_Void /* = Never */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Void|_#new#tearOff(dynamic it) → self::ET_Void
+static inline-class-member method ET_Void|_#new#tearOff(dynamic it) → self::ET_Void /* = Never */
   return self::ET_Void|(it);
-static inline-class-member method ET_Never|(dynamic it) → self::ET_Never {
-  lowered final self::ET_Never #this = it;
+static inline-class-member method ET_Never|(dynamic it) → self::ET_Never /* = Never */ {
+  lowered final self::ET_Never /* = Never */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Never|_#new#tearOff(dynamic it) → self::ET_Never
+static inline-class-member method ET_Never|_#new#tearOff(dynamic it) → self::ET_Never /* = Never */
   return self::ET_Never|(it);
-static inline-class-member method ET_Object|(dynamic it) → self::ET_Object {
-  lowered final self::ET_Object #this = it;
+static inline-class-member method ET_Object|(dynamic it) → self::ET_Object /* = core::Object */ {
+  lowered final self::ET_Object /* = core::Object */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Object|_#new#tearOff(dynamic it) → self::ET_Object
+static inline-class-member method ET_Object|_#new#tearOff(dynamic it) → self::ET_Object /* = core::Object */
   return self::ET_Object|(it);
-static inline-class-member method ET_Record|(dynamic it) → self::ET_Record {
-  lowered final self::ET_Record #this = it;
+static inline-class-member method ET_Record|(dynamic it) → self::ET_Record /* = core::Record */ {
+  lowered final self::ET_Record /* = core::Record */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Record|_#new#tearOff(dynamic it) → self::ET_Record
+static inline-class-member method ET_Record|_#new#tearOff(dynamic it) → self::ET_Record /* = core::Record */
   return self::ET_Record|(it);
-static inline-class-member method ET_RecordType|(dynamic it) → self::ET_RecordType {
-  lowered final self::ET_RecordType #this = it;
+static inline-class-member method ET_RecordType|(dynamic it) → self::ET_RecordType /* =(core::int, core::String) */ {
+  lowered final self::ET_RecordType /* =(core::int, core::String) */ #this = it;
   return #this;
 }
-static inline-class-member method ET_RecordType|_#new#tearOff(dynamic it) → self::ET_RecordType
+static inline-class-member method ET_RecordType|_#new#tearOff(dynamic it) → self::ET_RecordType /* =(core::int, core::String) */
   return self::ET_RecordType|(it);
-static inline-class-member method ET_Function|(dynamic it) → self::ET_Function {
-  lowered final self::ET_Function #this = it;
+static inline-class-member method ET_Function|(dynamic it) → self::ET_Function /* = core::Function */ {
+  lowered final self::ET_Function /* = core::Function */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Function|_#new#tearOff(dynamic it) → self::ET_Function
+static inline-class-member method ET_Function|_#new#tearOff(dynamic it) → self::ET_Function /* = core::Function */
   return self::ET_Function|(it);
-static inline-class-member method ET_FunctionType|(dynamic it) → self::ET_FunctionType {
-  lowered final self::ET_FunctionType #this = it;
+static inline-class-member method ET_FunctionType|(dynamic it) → self::ET_FunctionType /* = () → void */ {
+  lowered final self::ET_FunctionType /* = () → void */ #this = it;
   return #this;
 }
-static inline-class-member method ET_FunctionType|_#new#tearOff(dynamic it) → self::ET_FunctionType
+static inline-class-member method ET_FunctionType|_#new#tearOff(dynamic it) → self::ET_FunctionType /* = () → void */
   return self::ET_FunctionType|(it);
-static inline-class-member method ET_NullableInterfaceType|(dynamic it) → self::ET_NullableInterfaceType {
-  lowered final self::ET_NullableInterfaceType #this = it;
+static inline-class-member method ET_NullableInterfaceType|(dynamic it) → self::ET_NullableInterfaceType /* = core::String? */ {
+  lowered final self::ET_NullableInterfaceType /* = core::String? */ #this = it;
   return #this;
 }
-static inline-class-member method ET_NullableInterfaceType|_#new#tearOff(dynamic it) → self::ET_NullableInterfaceType
+static inline-class-member method ET_NullableInterfaceType|_#new#tearOff(dynamic it) → self::ET_NullableInterfaceType /* = core::String? */
   return self::ET_NullableInterfaceType|(it);
-static inline-class-member method ET_NullableExtensionType|(dynamic it) → self::ET_NullableExtensionType {
-  lowered final self::ET_NullableExtensionType #this = it;
+static inline-class-member method ET_NullableExtensionType|(dynamic it) → self::ET_NullableExtensionType /* = core::int? */ {
+  lowered final self::ET_NullableExtensionType /* = core::int? */ #this = it;
   return #this;
 }
-static inline-class-member method ET_NullableExtensionType|_#new#tearOff(dynamic it) → self::ET_NullableExtensionType
+static inline-class-member method ET_NullableExtensionType|_#new#tearOff(dynamic it) → self::ET_NullableExtensionType /* = core::int? */
   return self::ET_NullableExtensionType|(it);
-static inline-class-member method ET_FutureOr|(dynamic it) → self::ET_FutureOr {
-  lowered final self::ET_FutureOr #this = it;
+static inline-class-member method ET_FutureOr|(dynamic it) → self::ET_FutureOr /* = FutureOr<core::int>*/ {
+  lowered final self::ET_FutureOr /* = FutureOr<core::int>*/ #this = it;
   return #this;
 }
-static inline-class-member method ET_FutureOr|_#new#tearOff(dynamic it) → self::ET_FutureOr
+static inline-class-member method ET_FutureOr|_#new#tearOff(dynamic it) → self::ET_FutureOr /* = FutureOr<core::int>*/
   return self::ET_FutureOr|(it);
-static inline-class-member method ET_Extension|_#new#tearOff(dynamic it) → self::ET_Extension
+static inline-class-member method ET_Extension|_#new#tearOff(dynamic it) → self::ET_Extension /* = Never */
   return self::ET_Extension|(it);
-static inline-class-member method ET_Extension|(dynamic it) → self::ET_Extension {
-  lowered final self::ET_Extension #this = it;
+static inline-class-member method ET_Extension|(dynamic it) → self::ET_Extension /* = Never */ {
+  lowered final self::ET_Extension /* = Never */ #this = it;
   return #this;
 }
-static inline-class-member method ET_TypeVariable|<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|::T%> {
-  lowered final self::ET_TypeVariable<self::ET_TypeVariable|::T%> #this = it;
+static inline-class-member method ET_TypeVariable|<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|::T%> /* = self::ET_TypeVariable|::T% */ {
+  lowered final self::ET_TypeVariable<self::ET_TypeVariable|::T%> /* = self::ET_TypeVariable|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method ET_TypeVariable|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|_#new#tearOff::T%>
+static inline-class-member method ET_TypeVariable|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|_#new#tearOff::T%> /* = self::ET_TypeVariable|_#new#tearOff::T% */
   return self::ET_TypeVariable|<self::ET_TypeVariable|_#new#tearOff::T%>(it);
-static inline-class-member method ET_Class|(dynamic it) → self::ET_Class {
-  lowered final self::ET_Class #this = it;
+static inline-class-member method ET_Class|(dynamic it) → self::ET_Class /* = self::Class */ {
+  lowered final self::ET_Class /* = self::Class */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Class|_#new#tearOff(dynamic it) → self::ET_Class
+static inline-class-member method ET_Class|_#new#tearOff(dynamic it) → self::ET_Class /* = self::Class */
   return self::ET_Class|(it);
-static inline-class-member method ET_GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|::T%> {
-  lowered final self::ET_GenericClass<self::ET_GenericClass|::T%> #this = it;
+static inline-class-member method ET_GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|::T%> /* = self::GenericClass<self::ET_GenericClass|::T%> */ {
+  lowered final self::ET_GenericClass<self::ET_GenericClass|::T%> /* = self::GenericClass<self::ET_GenericClass|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method ET_GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|_#new#tearOff::T%>
+static inline-class-member method ET_GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|_#new#tearOff::T%> /* = self::GenericClass<self::ET_GenericClass|_#new#tearOff::T%> */
   return self::ET_GenericClass|<self::ET_GenericClass|_#new#tearOff::T%>(it);
-static inline-class-member method ET_Alias|(dynamic it) → self::ET_Alias {
-  lowered final self::ET_Alias #this = it;
+static inline-class-member method ET_Alias|(dynamic it) → self::ET_Alias /* = self::Class */ {
+  lowered final self::ET_Alias /* = self::Class */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Alias|_#new#tearOff(dynamic it) → self::ET_Alias
+static inline-class-member method ET_Alias|_#new#tearOff(dynamic it) → self::ET_Alias /* = self::Class */
   return self::ET_Alias|(it);
-static inline-class-member method ET_GenericAlias|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|::T%> {
-  lowered final self::ET_GenericAlias<self::ET_GenericAlias|::T%> #this = it;
+static inline-class-member method ET_GenericAlias|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|::T%> /* = self::GenericClass<self::ET_GenericAlias|::T%> */ {
+  lowered final self::ET_GenericAlias<self::ET_GenericAlias|::T%> /* = self::GenericClass<self::ET_GenericAlias|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method ET_GenericAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|_#new#tearOff::T%>
+static inline-class-member method ET_GenericAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|_#new#tearOff::T%> /* = self::GenericClass<self::ET_GenericAlias|_#new#tearOff::T%> */
   return self::ET_GenericAlias|<self::ET_GenericAlias|_#new#tearOff::T%>(it);
-static inline-class-member method ET_ExtensionType|(dynamic it) → self::ET_ExtensionType {
-  lowered final self::ET_ExtensionType #this = it;
+static inline-class-member method ET_ExtensionType|(dynamic it) → self::ET_ExtensionType /* = core::int */ {
+  lowered final self::ET_ExtensionType /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ET_ExtensionType|_#new#tearOff(dynamic it) → self::ET_ExtensionType
+static inline-class-member method ET_ExtensionType|_#new#tearOff(dynamic it) → self::ET_ExtensionType /* = core::int */
   return self::ET_ExtensionType|(it);
-static inline-class-member method ET_GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> {
-  lowered final self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> #this = it;
+static inline-class-member method ET_GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> /* = self::ET_GenericExtensionType|::T% */ {
+  lowered final self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> /* = self::ET_GenericExtensionType|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method ET_GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|_#new#tearOff::T%>
+static inline-class-member method ET_GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|_#new#tearOff::T%> /* = self::ET_GenericExtensionType|_#new#tearOff::T% */
   return self::ET_GenericExtensionType|<self::ET_GenericExtensionType|_#new#tearOff::T%>(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.weak.modular.expect
index 0f251c09c8f..2df0ca39fcd 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.weak.modular.expect
@@ -91,7 +91,7 @@ import "dart:async";
 typedef RecordType = (core::int, core::String);
 typedef FunctionType = () → void;
 typedef NullableInterfaceType = core::String?;
-typedef NullableExtensionType = self::ExtensionType?;
+typedef NullableExtensionType = self::ExtensionType? /* = core::int? */;
 typedef Alias = self::Class;
 typedef GenericAlias<T extends core::Object? = dynamic> = self::GenericClass<T%>;
 class Class extends core::Object {
@@ -154,7 +154,7 @@ extension type ET_NullableInterfaceType(core::String? it) {
   constructor • = self::ET_NullableInterfaceType|;
   tearoff • = self::ET_NullableInterfaceType|_#new#tearOff;
 }
-extension type ET_NullableExtensionType(self::ExtensionType? it) {
+extension type ET_NullableExtensionType(self::ExtensionType? /* = core::int? */ it) {
   constructor • = self::ET_NullableExtensionType|;
   tearoff • = self::ET_NullableExtensionType|_#new#tearOff;
 }
@@ -186,143 +186,143 @@ extension type ET_GenericAlias<T extends core::Object? = dynamic>(self::GenericC
   constructor • = self::ET_GenericAlias|;
   tearoff • = self::ET_GenericAlias|_#new#tearOff;
 }
-extension type ET_ExtensionType(self::ExtensionType it) implements self::ExtensionType {
+extension type ET_ExtensionType(self::ExtensionType /* = core::int */ it) implements self::ExtensionType /* = core::int */ {
   constructor • = self::ET_ExtensionType|;
   tearoff • = self::ET_ExtensionType|_#new#tearOff;
 }
-extension type ET_GenericExtensionType<T extends core::Object? = dynamic>(self::GenericExtensionType<T%> it) implements self::GenericExtensionType<T%> {
+extension type ET_GenericExtensionType<T extends core::Object? = dynamic>(self::GenericExtensionType<T%> /* = T% */ it) implements self::GenericExtensionType<T%> /* = T% */ {
   constructor • = self::ET_GenericExtensionType|;
   tearoff • = self::ET_GenericExtensionType|_#new#tearOff;
 }
-static inline-class-member method ExtensionType|(dynamic it) → self::ExtensionType {
-  lowered final self::ExtensionType #this = it;
+static inline-class-member method ExtensionType|(dynamic it) → self::ExtensionType /* = core::int */ {
+  lowered final self::ExtensionType /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → self::ExtensionType
+static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → self::ExtensionType /* = core::int */
   return self::ExtensionType|(it);
-static inline-class-member method GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|::T%> {
-  lowered final self::GenericExtensionType<self::GenericExtensionType|::T%> #this = it;
+static inline-class-member method GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|::T%> /* = self::GenericExtensionType|::T% */ {
+  lowered final self::GenericExtensionType<self::GenericExtensionType|::T%> /* = self::GenericExtensionType|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|_#new#tearOff::T%>
+static inline-class-member method GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|_#new#tearOff::T%> /* = self::GenericExtensionType|_#new#tearOff::T% */
   return self::GenericExtensionType|<self::GenericExtensionType|_#new#tearOff::T%>(it);
-static inline-class-member method ET_Null|(dynamic it) → self::ET_Null {
-  lowered final self::ET_Null #this = it;
+static inline-class-member method ET_Null|(dynamic it) → self::ET_Null /* = Null */ {
+  lowered final self::ET_Null /* = Null */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Null|_#new#tearOff(dynamic it) → self::ET_Null
+static inline-class-member method ET_Null|_#new#tearOff(dynamic it) → self::ET_Null /* = Null */
   return self::ET_Null|(it);
-static inline-class-member method ET_Dynamic|(dynamic it) → self::ET_Dynamic {
-  lowered final self::ET_Dynamic #this = it;
+static inline-class-member method ET_Dynamic|(dynamic it) → self::ET_Dynamic /* = dynamic */ {
+  lowered final self::ET_Dynamic /* = dynamic */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Dynamic|_#new#tearOff(dynamic it) → self::ET_Dynamic
+static inline-class-member method ET_Dynamic|_#new#tearOff(dynamic it) → self::ET_Dynamic /* = dynamic */
   return self::ET_Dynamic|(it);
-static inline-class-member method ET_Void|(dynamic it) → self::ET_Void {
-  lowered final self::ET_Void #this = it;
+static inline-class-member method ET_Void|(dynamic it) → self::ET_Void /* = Never */ {
+  lowered final self::ET_Void /* = Never */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Void|_#new#tearOff(dynamic it) → self::ET_Void
+static inline-class-member method ET_Void|_#new#tearOff(dynamic it) → self::ET_Void /* = Never */
   return self::ET_Void|(it);
-static inline-class-member method ET_Never|(dynamic it) → self::ET_Never {
-  lowered final self::ET_Never #this = it;
+static inline-class-member method ET_Never|(dynamic it) → self::ET_Never /* = Never */ {
+  lowered final self::ET_Never /* = Never */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Never|_#new#tearOff(dynamic it) → self::ET_Never
+static inline-class-member method ET_Never|_#new#tearOff(dynamic it) → self::ET_Never /* = Never */
   return self::ET_Never|(it);
-static inline-class-member method ET_Object|(dynamic it) → self::ET_Object {
-  lowered final self::ET_Object #this = it;
+static inline-class-member method ET_Object|(dynamic it) → self::ET_Object /* = core::Object */ {
+  lowered final self::ET_Object /* = core::Object */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Object|_#new#tearOff(dynamic it) → self::ET_Object
+static inline-class-member method ET_Object|_#new#tearOff(dynamic it) → self::ET_Object /* = core::Object */
   return self::ET_Object|(it);
-static inline-class-member method ET_Record|(dynamic it) → self::ET_Record {
-  lowered final self::ET_Record #this = it;
+static inline-class-member method ET_Record|(dynamic it) → self::ET_Record /* = core::Record */ {
+  lowered final self::ET_Record /* = core::Record */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Record|_#new#tearOff(dynamic it) → self::ET_Record
+static inline-class-member method ET_Record|_#new#tearOff(dynamic it) → self::ET_Record /* = core::Record */
   return self::ET_Record|(it);
-static inline-class-member method ET_RecordType|(dynamic it) → self::ET_RecordType {
-  lowered final self::ET_RecordType #this = it;
+static inline-class-member method ET_RecordType|(dynamic it) → self::ET_RecordType /* =(core::int, core::String) */ {
+  lowered final self::ET_RecordType /* =(core::int, core::String) */ #this = it;
   return #this;
 }
-static inline-class-member method ET_RecordType|_#new#tearOff(dynamic it) → self::ET_RecordType
+static inline-class-member method ET_RecordType|_#new#tearOff(dynamic it) → self::ET_RecordType /* =(core::int, core::String) */
   return self::ET_RecordType|(it);
-static inline-class-member method ET_Function|(dynamic it) → self::ET_Function {
-  lowered final self::ET_Function #this = it;
+static inline-class-member method ET_Function|(dynamic it) → self::ET_Function /* = core::Function */ {
+  lowered final self::ET_Function /* = core::Function */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Function|_#new#tearOff(dynamic it) → self::ET_Function
+static inline-class-member method ET_Function|_#new#tearOff(dynamic it) → self::ET_Function /* = core::Function */
   return self::ET_Function|(it);
-static inline-class-member method ET_FunctionType|(dynamic it) → self::ET_FunctionType {
-  lowered final self::ET_FunctionType #this = it;
+static inline-class-member method ET_FunctionType|(dynamic it) → self::ET_FunctionType /* = () → void */ {
+  lowered final self::ET_FunctionType /* = () → void */ #this = it;
   return #this;
 }
-static inline-class-member method ET_FunctionType|_#new#tearOff(dynamic it) → self::ET_FunctionType
+static inline-class-member method ET_FunctionType|_#new#tearOff(dynamic it) → self::ET_FunctionType /* = () → void */
   return self::ET_FunctionType|(it);
-static inline-class-member method ET_NullableInterfaceType|(dynamic it) → self::ET_NullableInterfaceType {
-  lowered final self::ET_NullableInterfaceType #this = it;
+static inline-class-member method ET_NullableInterfaceType|(dynamic it) → self::ET_NullableInterfaceType /* = core::String? */ {
+  lowered final self::ET_NullableInterfaceType /* = core::String? */ #this = it;
   return #this;
 }
-static inline-class-member method ET_NullableInterfaceType|_#new#tearOff(dynamic it) → self::ET_NullableInterfaceType
+static inline-class-member method ET_NullableInterfaceType|_#new#tearOff(dynamic it) → self::ET_NullableInterfaceType /* = core::String? */
   return self::ET_NullableInterfaceType|(it);
-static inline-class-member method ET_NullableExtensionType|(dynamic it) → self::ET_NullableExtensionType {
-  lowered final self::ET_NullableExtensionType #this = it;
+static inline-class-member method ET_NullableExtensionType|(dynamic it) → self::ET_NullableExtensionType /* = core::int? */ {
+  lowered final self::ET_NullableExtensionType /* = core::int? */ #this = it;
   return #this;
 }
-static inline-class-member method ET_NullableExtensionType|_#new#tearOff(dynamic it) → self::ET_NullableExtensionType
+static inline-class-member method ET_NullableExtensionType|_#new#tearOff(dynamic it) → self::ET_NullableExtensionType /* = core::int? */
   return self::ET_NullableExtensionType|(it);
-static inline-class-member method ET_FutureOr|(dynamic it) → self::ET_FutureOr {
-  lowered final self::ET_FutureOr #this = it;
+static inline-class-member method ET_FutureOr|(dynamic it) → self::ET_FutureOr /* = FutureOr<core::int>*/ {
+  lowered final self::ET_FutureOr /* = FutureOr<core::int>*/ #this = it;
   return #this;
 }
-static inline-class-member method ET_FutureOr|_#new#tearOff(dynamic it) → self::ET_FutureOr
+static inline-class-member method ET_FutureOr|_#new#tearOff(dynamic it) → self::ET_FutureOr /* = FutureOr<core::int>*/
   return self::ET_FutureOr|(it);
-static inline-class-member method ET_Extension|_#new#tearOff(dynamic it) → self::ET_Extension
+static inline-class-member method ET_Extension|_#new#tearOff(dynamic it) → self::ET_Extension /* = Never */
   return self::ET_Extension|(it);
-static inline-class-member method ET_Extension|(dynamic it) → self::ET_Extension {
-  lowered final self::ET_Extension #this = it;
+static inline-class-member method ET_Extension|(dynamic it) → self::ET_Extension /* = Never */ {
+  lowered final self::ET_Extension /* = Never */ #this = it;
   return #this;
 }
-static inline-class-member method ET_TypeVariable|<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|::T%> {
-  lowered final self::ET_TypeVariable<self::ET_TypeVariable|::T%> #this = it;
+static inline-class-member method ET_TypeVariable|<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|::T%> /* = self::ET_TypeVariable|::T% */ {
+  lowered final self::ET_TypeVariable<self::ET_TypeVariable|::T%> /* = self::ET_TypeVariable|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method ET_TypeVariable|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|_#new#tearOff::T%>
+static inline-class-member method ET_TypeVariable|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|_#new#tearOff::T%> /* = self::ET_TypeVariable|_#new#tearOff::T% */
   return self::ET_TypeVariable|<self::ET_TypeVariable|_#new#tearOff::T%>(it);
-static inline-class-member method ET_Class|(dynamic it) → self::ET_Class {
-  lowered final self::ET_Class #this = it;
+static inline-class-member method ET_Class|(dynamic it) → self::ET_Class /* = self::Class */ {
+  lowered final self::ET_Class /* = self::Class */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Class|_#new#tearOff(dynamic it) → self::ET_Class
+static inline-class-member method ET_Class|_#new#tearOff(dynamic it) → self::ET_Class /* = self::Class */
   return self::ET_Class|(it);
-static inline-class-member method ET_GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|::T%> {
-  lowered final self::ET_GenericClass<self::ET_GenericClass|::T%> #this = it;
+static inline-class-member method ET_GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|::T%> /* = self::GenericClass<self::ET_GenericClass|::T%> */ {
+  lowered final self::ET_GenericClass<self::ET_GenericClass|::T%> /* = self::GenericClass<self::ET_GenericClass|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method ET_GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|_#new#tearOff::T%>
+static inline-class-member method ET_GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|_#new#tearOff::T%> /* = self::GenericClass<self::ET_GenericClass|_#new#tearOff::T%> */
   return self::ET_GenericClass|<self::ET_GenericClass|_#new#tearOff::T%>(it);
-static inline-class-member method ET_Alias|(dynamic it) → self::ET_Alias {
-  lowered final self::ET_Alias #this = it;
+static inline-class-member method ET_Alias|(dynamic it) → self::ET_Alias /* = self::Class */ {
+  lowered final self::ET_Alias /* = self::Class */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Alias|_#new#tearOff(dynamic it) → self::ET_Alias
+static inline-class-member method ET_Alias|_#new#tearOff(dynamic it) → self::ET_Alias /* = self::Class */
   return self::ET_Alias|(it);
-static inline-class-member method ET_GenericAlias|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|::T%> {
-  lowered final self::ET_GenericAlias<self::ET_GenericAlias|::T%> #this = it;
+static inline-class-member method ET_GenericAlias|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|::T%> /* = self::GenericClass<self::ET_GenericAlias|::T%> */ {
+  lowered final self::ET_GenericAlias<self::ET_GenericAlias|::T%> /* = self::GenericClass<self::ET_GenericAlias|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method ET_GenericAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|_#new#tearOff::T%>
+static inline-class-member method ET_GenericAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|_#new#tearOff::T%> /* = self::GenericClass<self::ET_GenericAlias|_#new#tearOff::T%> */
   return self::ET_GenericAlias|<self::ET_GenericAlias|_#new#tearOff::T%>(it);
-static inline-class-member method ET_ExtensionType|(dynamic it) → self::ET_ExtensionType {
-  lowered final self::ET_ExtensionType #this = it;
+static inline-class-member method ET_ExtensionType|(dynamic it) → self::ET_ExtensionType /* = core::int */ {
+  lowered final self::ET_ExtensionType /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ET_ExtensionType|_#new#tearOff(dynamic it) → self::ET_ExtensionType
+static inline-class-member method ET_ExtensionType|_#new#tearOff(dynamic it) → self::ET_ExtensionType /* = core::int */
   return self::ET_ExtensionType|(it);
-static inline-class-member method ET_GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> {
-  lowered final self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> #this = it;
+static inline-class-member method ET_GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> /* = self::ET_GenericExtensionType|::T% */ {
+  lowered final self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> /* = self::ET_GenericExtensionType|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method ET_GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|_#new#tearOff::T%>
+static inline-class-member method ET_GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|_#new#tearOff::T%> /* = self::ET_GenericExtensionType|_#new#tearOff::T% */
   return self::ET_GenericExtensionType|<self::ET_GenericExtensionType|_#new#tearOff::T%>(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.weak.outline.expect
index 8720578f618..6a2903a17d1 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.weak.outline.expect
@@ -91,7 +91,7 @@ import "dart:async";
 typedef RecordType = (core::int, core::String);
 typedef FunctionType = () → void;
 typedef NullableInterfaceType = core::String?;
-typedef NullableExtensionType = self::ExtensionType?;
+typedef NullableExtensionType = self::ExtensionType? /* = core::int? */;
 typedef Alias = self::Class;
 typedef GenericAlias<T extends core::Object? = dynamic> = self::GenericClass<T%>;
 class Class extends core::Object {
@@ -152,7 +152,7 @@ extension type ET_NullableInterfaceType(core::String? it) {
   constructor • = self::ET_NullableInterfaceType|;
   tearoff • = self::ET_NullableInterfaceType|_#new#tearOff;
 }
-extension type ET_NullableExtensionType(self::ExtensionType? it) {
+extension type ET_NullableExtensionType(self::ExtensionType? /* = core::int? */ it) {
   constructor • = self::ET_NullableExtensionType|;
   tearoff • = self::ET_NullableExtensionType|_#new#tearOff;
 }
@@ -184,99 +184,99 @@ extension type ET_GenericAlias<T extends core::Object? = dynamic>(self::GenericC
   constructor • = self::ET_GenericAlias|;
   tearoff • = self::ET_GenericAlias|_#new#tearOff;
 }
-extension type ET_ExtensionType(self::ExtensionType it) implements self::ExtensionType {
+extension type ET_ExtensionType(self::ExtensionType /* = core::int */ it) implements self::ExtensionType /* = core::int */ {
   constructor • = self::ET_ExtensionType|;
   tearoff • = self::ET_ExtensionType|_#new#tearOff;
 }
-extension type ET_GenericExtensionType<T extends core::Object? = dynamic>(self::GenericExtensionType<T%> it) implements self::GenericExtensionType<T%> {
+extension type ET_GenericExtensionType<T extends core::Object? = dynamic>(self::GenericExtensionType<T%> /* = T% */ it) implements self::GenericExtensionType<T%> /* = T% */ {
   constructor • = self::ET_GenericExtensionType|;
   tearoff • = self::ET_GenericExtensionType|_#new#tearOff;
 }
-static inline-class-member method ExtensionType|(dynamic it) → self::ExtensionType
+static inline-class-member method ExtensionType|(dynamic it) → self::ExtensionType /* = core::int */
   ;
-static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → self::ExtensionType
+static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → self::ExtensionType /* = core::int */
   return self::ExtensionType|(it);
-static inline-class-member method GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|::T%>
+static inline-class-member method GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|::T%> /* = self::GenericExtensionType|::T% */
   ;
-static inline-class-member method GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|_#new#tearOff::T%>
+static inline-class-member method GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|_#new#tearOff::T%> /* = self::GenericExtensionType|_#new#tearOff::T% */
   return self::GenericExtensionType|<self::GenericExtensionType|_#new#tearOff::T%>(it);
-static inline-class-member method ET_Null|(dynamic it) → self::ET_Null
+static inline-class-member method ET_Null|(dynamic it) → self::ET_Null /* = Null */
   ;
-static inline-class-member method ET_Null|_#new#tearOff(dynamic it) → self::ET_Null
+static inline-class-member method ET_Null|_#new#tearOff(dynamic it) → self::ET_Null /* = Null */
   return self::ET_Null|(it);
-static inline-class-member method ET_Dynamic|(dynamic it) → self::ET_Dynamic
+static inline-class-member method ET_Dynamic|(dynamic it) → self::ET_Dynamic /* = dynamic */
   ;
-static inline-class-member method ET_Dynamic|_#new#tearOff(dynamic it) → self::ET_Dynamic
+static inline-class-member method ET_Dynamic|_#new#tearOff(dynamic it) → self::ET_Dynamic /* = dynamic */
   return self::ET_Dynamic|(it);
-static inline-class-member method ET_Void|(dynamic it) → self::ET_Void
+static inline-class-member method ET_Void|(dynamic it) → self::ET_Void /* = Never */
   ;
-static inline-class-member method ET_Void|_#new#tearOff(dynamic it) → self::ET_Void
+static inline-class-member method ET_Void|_#new#tearOff(dynamic it) → self::ET_Void /* = Never */
   return self::ET_Void|(it);
-static inline-class-member method ET_Never|(dynamic it) → self::ET_Never
+static inline-class-member method ET_Never|(dynamic it) → self::ET_Never /* = Never */
   ;
-static inline-class-member method ET_Never|_#new#tearOff(dynamic it) → self::ET_Never
+static inline-class-member method ET_Never|_#new#tearOff(dynamic it) → self::ET_Never /* = Never */
   return self::ET_Never|(it);
-static inline-class-member method ET_Object|(dynamic it) → self::ET_Object
+static inline-class-member method ET_Object|(dynamic it) → self::ET_Object /* = core::Object */
   ;
-static inline-class-member method ET_Object|_#new#tearOff(dynamic it) → self::ET_Object
+static inline-class-member method ET_Object|_#new#tearOff(dynamic it) → self::ET_Object /* = core::Object */
   return self::ET_Object|(it);
-static inline-class-member method ET_Record|(dynamic it) → self::ET_Record
+static inline-class-member method ET_Record|(dynamic it) → self::ET_Record /* = core::Record */
   ;
-static inline-class-member method ET_Record|_#new#tearOff(dynamic it) → self::ET_Record
+static inline-class-member method ET_Record|_#new#tearOff(dynamic it) → self::ET_Record /* = core::Record */
   return self::ET_Record|(it);
-static inline-class-member method ET_RecordType|(dynamic it) → self::ET_RecordType
+static inline-class-member method ET_RecordType|(dynamic it) → self::ET_RecordType /* =(core::int, core::String) */
   ;
-static inline-class-member method ET_RecordType|_#new#tearOff(dynamic it) → self::ET_RecordType
+static inline-class-member method ET_RecordType|_#new#tearOff(dynamic it) → self::ET_RecordType /* =(core::int, core::String) */
   return self::ET_RecordType|(it);
-static inline-class-member method ET_Function|(dynamic it) → self::ET_Function
+static inline-class-member method ET_Function|(dynamic it) → self::ET_Function /* = core::Function */
   ;
-static inline-class-member method ET_Function|_#new#tearOff(dynamic it) → self::ET_Function
+static inline-class-member method ET_Function|_#new#tearOff(dynamic it) → self::ET_Function /* = core::Function */
   return self::ET_Function|(it);
-static inline-class-member method ET_FunctionType|(dynamic it) → self::ET_FunctionType
+static inline-class-member method ET_FunctionType|(dynamic it) → self::ET_FunctionType /* = () → void */
   ;
-static inline-class-member method ET_FunctionType|_#new#tearOff(dynamic it) → self::ET_FunctionType
+static inline-class-member method ET_FunctionType|_#new#tearOff(dynamic it) → self::ET_FunctionType /* = () → void */
   return self::ET_FunctionType|(it);
-static inline-class-member method ET_NullableInterfaceType|(dynamic it) → self::ET_NullableInterfaceType
+static inline-class-member method ET_NullableInterfaceType|(dynamic it) → self::ET_NullableInterfaceType /* = core::String? */
   ;
-static inline-class-member method ET_NullableInterfaceType|_#new#tearOff(dynamic it) → self::ET_NullableInterfaceType
+static inline-class-member method ET_NullableInterfaceType|_#new#tearOff(dynamic it) → self::ET_NullableInterfaceType /* = core::String? */
   return self::ET_NullableInterfaceType|(it);
-static inline-class-member method ET_NullableExtensionType|(dynamic it) → self::ET_NullableExtensionType
+static inline-class-member method ET_NullableExtensionType|(dynamic it) → self::ET_NullableExtensionType /* = core::int? */
   ;
-static inline-class-member method ET_NullableExtensionType|_#new#tearOff(dynamic it) → self::ET_NullableExtensionType
+static inline-class-member method ET_NullableExtensionType|_#new#tearOff(dynamic it) → self::ET_NullableExtensionType /* = core::int? */
   return self::ET_NullableExtensionType|(it);
-static inline-class-member method ET_FutureOr|(dynamic it) → self::ET_FutureOr
+static inline-class-member method ET_FutureOr|(dynamic it) → self::ET_FutureOr /* = FutureOr<core::int>*/
   ;
-static inline-class-member method ET_FutureOr|_#new#tearOff(dynamic it) → self::ET_FutureOr
+static inline-class-member method ET_FutureOr|_#new#tearOff(dynamic it) → self::ET_FutureOr /* = FutureOr<core::int>*/
   return self::ET_FutureOr|(it);
-static inline-class-member method ET_Extension|_#new#tearOff(dynamic it) → self::ET_Extension
+static inline-class-member method ET_Extension|_#new#tearOff(dynamic it) → self::ET_Extension /* = Never */
   return self::ET_Extension|(it);
-static inline-class-member method ET_Extension|(dynamic it) → self::ET_Extension
+static inline-class-member method ET_Extension|(dynamic it) → self::ET_Extension /* = Never */
   ;
-static inline-class-member method ET_TypeVariable|<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|::T%>
+static inline-class-member method ET_TypeVariable|<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|::T%> /* = self::ET_TypeVariable|::T% */
   ;
-static inline-class-member method ET_TypeVariable|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|_#new#tearOff::T%>
+static inline-class-member method ET_TypeVariable|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|_#new#tearOff::T%> /* = self::ET_TypeVariable|_#new#tearOff::T% */
   return self::ET_TypeVariable|<self::ET_TypeVariable|_#new#tearOff::T%>(it);
-static inline-class-member method ET_Class|(dynamic it) → self::ET_Class
+static inline-class-member method ET_Class|(dynamic it) → self::ET_Class /* = self::Class */
   ;
-static inline-class-member method ET_Class|_#new#tearOff(dynamic it) → self::ET_Class
+static inline-class-member method ET_Class|_#new#tearOff(dynamic it) → self::ET_Class /* = self::Class */
   return self::ET_Class|(it);
-static inline-class-member method ET_GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|::T%>
+static inline-class-member method ET_GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|::T%> /* = self::GenericClass<self::ET_GenericClass|::T%> */
   ;
-static inline-class-member method ET_GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|_#new#tearOff::T%>
+static inline-class-member method ET_GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|_#new#tearOff::T%> /* = self::GenericClass<self::ET_GenericClass|_#new#tearOff::T%> */
   return self::ET_GenericClass|<self::ET_GenericClass|_#new#tearOff::T%>(it);
-static inline-class-member method ET_Alias|(dynamic it) → self::ET_Alias
+static inline-class-member method ET_Alias|(dynamic it) → self::ET_Alias /* = self::Class */
   ;
-static inline-class-member method ET_Alias|_#new#tearOff(dynamic it) → self::ET_Alias
+static inline-class-member method ET_Alias|_#new#tearOff(dynamic it) → self::ET_Alias /* = self::Class */
   return self::ET_Alias|(it);
-static inline-class-member method ET_GenericAlias|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|::T%>
+static inline-class-member method ET_GenericAlias|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|::T%> /* = self::GenericClass<self::ET_GenericAlias|::T%> */
   ;
-static inline-class-member method ET_GenericAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|_#new#tearOff::T%>
+static inline-class-member method ET_GenericAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|_#new#tearOff::T%> /* = self::GenericClass<self::ET_GenericAlias|_#new#tearOff::T%> */
   return self::ET_GenericAlias|<self::ET_GenericAlias|_#new#tearOff::T%>(it);
-static inline-class-member method ET_ExtensionType|(dynamic it) → self::ET_ExtensionType
+static inline-class-member method ET_ExtensionType|(dynamic it) → self::ET_ExtensionType /* = core::int */
   ;
-static inline-class-member method ET_ExtensionType|_#new#tearOff(dynamic it) → self::ET_ExtensionType
+static inline-class-member method ET_ExtensionType|_#new#tearOff(dynamic it) → self::ET_ExtensionType /* = core::int */
   return self::ET_ExtensionType|(it);
-static inline-class-member method ET_GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%>
+static inline-class-member method ET_GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> /* = self::ET_GenericExtensionType|::T% */
   ;
-static inline-class-member method ET_GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|_#new#tearOff::T%>
+static inline-class-member method ET_GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|_#new#tearOff::T%> /* = self::ET_GenericExtensionType|_#new#tearOff::T% */
   return self::ET_GenericExtensionType|<self::ET_GenericExtensionType|_#new#tearOff::T%>(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.weak.transformed.expect
index 0f251c09c8f..2df0ca39fcd 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/implement_all.dart.weak.transformed.expect
@@ -91,7 +91,7 @@ import "dart:async";
 typedef RecordType = (core::int, core::String);
 typedef FunctionType = () → void;
 typedef NullableInterfaceType = core::String?;
-typedef NullableExtensionType = self::ExtensionType?;
+typedef NullableExtensionType = self::ExtensionType? /* = core::int? */;
 typedef Alias = self::Class;
 typedef GenericAlias<T extends core::Object? = dynamic> = self::GenericClass<T%>;
 class Class extends core::Object {
@@ -154,7 +154,7 @@ extension type ET_NullableInterfaceType(core::String? it) {
   constructor • = self::ET_NullableInterfaceType|;
   tearoff • = self::ET_NullableInterfaceType|_#new#tearOff;
 }
-extension type ET_NullableExtensionType(self::ExtensionType? it) {
+extension type ET_NullableExtensionType(self::ExtensionType? /* = core::int? */ it) {
   constructor • = self::ET_NullableExtensionType|;
   tearoff • = self::ET_NullableExtensionType|_#new#tearOff;
 }
@@ -186,143 +186,143 @@ extension type ET_GenericAlias<T extends core::Object? = dynamic>(self::GenericC
   constructor • = self::ET_GenericAlias|;
   tearoff • = self::ET_GenericAlias|_#new#tearOff;
 }
-extension type ET_ExtensionType(self::ExtensionType it) implements self::ExtensionType {
+extension type ET_ExtensionType(self::ExtensionType /* = core::int */ it) implements self::ExtensionType /* = core::int */ {
   constructor • = self::ET_ExtensionType|;
   tearoff • = self::ET_ExtensionType|_#new#tearOff;
 }
-extension type ET_GenericExtensionType<T extends core::Object? = dynamic>(self::GenericExtensionType<T%> it) implements self::GenericExtensionType<T%> {
+extension type ET_GenericExtensionType<T extends core::Object? = dynamic>(self::GenericExtensionType<T%> /* = T% */ it) implements self::GenericExtensionType<T%> /* = T% */ {
   constructor • = self::ET_GenericExtensionType|;
   tearoff • = self::ET_GenericExtensionType|_#new#tearOff;
 }
-static inline-class-member method ExtensionType|(dynamic it) → self::ExtensionType {
-  lowered final self::ExtensionType #this = it;
+static inline-class-member method ExtensionType|(dynamic it) → self::ExtensionType /* = core::int */ {
+  lowered final self::ExtensionType /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → self::ExtensionType
+static inline-class-member method ExtensionType|_#new#tearOff(dynamic it) → self::ExtensionType /* = core::int */
   return self::ExtensionType|(it);
-static inline-class-member method GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|::T%> {
-  lowered final self::GenericExtensionType<self::GenericExtensionType|::T%> #this = it;
+static inline-class-member method GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|::T%> /* = self::GenericExtensionType|::T% */ {
+  lowered final self::GenericExtensionType<self::GenericExtensionType|::T%> /* = self::GenericExtensionType|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|_#new#tearOff::T%>
+static inline-class-member method GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericExtensionType<self::GenericExtensionType|_#new#tearOff::T%> /* = self::GenericExtensionType|_#new#tearOff::T% */
   return self::GenericExtensionType|<self::GenericExtensionType|_#new#tearOff::T%>(it);
-static inline-class-member method ET_Null|(dynamic it) → self::ET_Null {
-  lowered final self::ET_Null #this = it;
+static inline-class-member method ET_Null|(dynamic it) → self::ET_Null /* = Null */ {
+  lowered final self::ET_Null /* = Null */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Null|_#new#tearOff(dynamic it) → self::ET_Null
+static inline-class-member method ET_Null|_#new#tearOff(dynamic it) → self::ET_Null /* = Null */
   return self::ET_Null|(it);
-static inline-class-member method ET_Dynamic|(dynamic it) → self::ET_Dynamic {
-  lowered final self::ET_Dynamic #this = it;
+static inline-class-member method ET_Dynamic|(dynamic it) → self::ET_Dynamic /* = dynamic */ {
+  lowered final self::ET_Dynamic /* = dynamic */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Dynamic|_#new#tearOff(dynamic it) → self::ET_Dynamic
+static inline-class-member method ET_Dynamic|_#new#tearOff(dynamic it) → self::ET_Dynamic /* = dynamic */
   return self::ET_Dynamic|(it);
-static inline-class-member method ET_Void|(dynamic it) → self::ET_Void {
-  lowered final self::ET_Void #this = it;
+static inline-class-member method ET_Void|(dynamic it) → self::ET_Void /* = Never */ {
+  lowered final self::ET_Void /* = Never */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Void|_#new#tearOff(dynamic it) → self::ET_Void
+static inline-class-member method ET_Void|_#new#tearOff(dynamic it) → self::ET_Void /* = Never */
   return self::ET_Void|(it);
-static inline-class-member method ET_Never|(dynamic it) → self::ET_Never {
-  lowered final self::ET_Never #this = it;
+static inline-class-member method ET_Never|(dynamic it) → self::ET_Never /* = Never */ {
+  lowered final self::ET_Never /* = Never */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Never|_#new#tearOff(dynamic it) → self::ET_Never
+static inline-class-member method ET_Never|_#new#tearOff(dynamic it) → self::ET_Never /* = Never */
   return self::ET_Never|(it);
-static inline-class-member method ET_Object|(dynamic it) → self::ET_Object {
-  lowered final self::ET_Object #this = it;
+static inline-class-member method ET_Object|(dynamic it) → self::ET_Object /* = core::Object */ {
+  lowered final self::ET_Object /* = core::Object */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Object|_#new#tearOff(dynamic it) → self::ET_Object
+static inline-class-member method ET_Object|_#new#tearOff(dynamic it) → self::ET_Object /* = core::Object */
   return self::ET_Object|(it);
-static inline-class-member method ET_Record|(dynamic it) → self::ET_Record {
-  lowered final self::ET_Record #this = it;
+static inline-class-member method ET_Record|(dynamic it) → self::ET_Record /* = core::Record */ {
+  lowered final self::ET_Record /* = core::Record */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Record|_#new#tearOff(dynamic it) → self::ET_Record
+static inline-class-member method ET_Record|_#new#tearOff(dynamic it) → self::ET_Record /* = core::Record */
   return self::ET_Record|(it);
-static inline-class-member method ET_RecordType|(dynamic it) → self::ET_RecordType {
-  lowered final self::ET_RecordType #this = it;
+static inline-class-member method ET_RecordType|(dynamic it) → self::ET_RecordType /* =(core::int, core::String) */ {
+  lowered final self::ET_RecordType /* =(core::int, core::String) */ #this = it;
   return #this;
 }
-static inline-class-member method ET_RecordType|_#new#tearOff(dynamic it) → self::ET_RecordType
+static inline-class-member method ET_RecordType|_#new#tearOff(dynamic it) → self::ET_RecordType /* =(core::int, core::String) */
   return self::ET_RecordType|(it);
-static inline-class-member method ET_Function|(dynamic it) → self::ET_Function {
-  lowered final self::ET_Function #this = it;
+static inline-class-member method ET_Function|(dynamic it) → self::ET_Function /* = core::Function */ {
+  lowered final self::ET_Function /* = core::Function */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Function|_#new#tearOff(dynamic it) → self::ET_Function
+static inline-class-member method ET_Function|_#new#tearOff(dynamic it) → self::ET_Function /* = core::Function */
   return self::ET_Function|(it);
-static inline-class-member method ET_FunctionType|(dynamic it) → self::ET_FunctionType {
-  lowered final self::ET_FunctionType #this = it;
+static inline-class-member method ET_FunctionType|(dynamic it) → self::ET_FunctionType /* = () → void */ {
+  lowered final self::ET_FunctionType /* = () → void */ #this = it;
   return #this;
 }
-static inline-class-member method ET_FunctionType|_#new#tearOff(dynamic it) → self::ET_FunctionType
+static inline-class-member method ET_FunctionType|_#new#tearOff(dynamic it) → self::ET_FunctionType /* = () → void */
   return self::ET_FunctionType|(it);
-static inline-class-member method ET_NullableInterfaceType|(dynamic it) → self::ET_NullableInterfaceType {
-  lowered final self::ET_NullableInterfaceType #this = it;
+static inline-class-member method ET_NullableInterfaceType|(dynamic it) → self::ET_NullableInterfaceType /* = core::String? */ {
+  lowered final self::ET_NullableInterfaceType /* = core::String? */ #this = it;
   return #this;
 }
-static inline-class-member method ET_NullableInterfaceType|_#new#tearOff(dynamic it) → self::ET_NullableInterfaceType
+static inline-class-member method ET_NullableInterfaceType|_#new#tearOff(dynamic it) → self::ET_NullableInterfaceType /* = core::String? */
   return self::ET_NullableInterfaceType|(it);
-static inline-class-member method ET_NullableExtensionType|(dynamic it) → self::ET_NullableExtensionType {
-  lowered final self::ET_NullableExtensionType #this = it;
+static inline-class-member method ET_NullableExtensionType|(dynamic it) → self::ET_NullableExtensionType /* = core::int? */ {
+  lowered final self::ET_NullableExtensionType /* = core::int? */ #this = it;
   return #this;
 }
-static inline-class-member method ET_NullableExtensionType|_#new#tearOff(dynamic it) → self::ET_NullableExtensionType
+static inline-class-member method ET_NullableExtensionType|_#new#tearOff(dynamic it) → self::ET_NullableExtensionType /* = core::int? */
   return self::ET_NullableExtensionType|(it);
-static inline-class-member method ET_FutureOr|(dynamic it) → self::ET_FutureOr {
-  lowered final self::ET_FutureOr #this = it;
+static inline-class-member method ET_FutureOr|(dynamic it) → self::ET_FutureOr /* = FutureOr<core::int>*/ {
+  lowered final self::ET_FutureOr /* = FutureOr<core::int>*/ #this = it;
   return #this;
 }
-static inline-class-member method ET_FutureOr|_#new#tearOff(dynamic it) → self::ET_FutureOr
+static inline-class-member method ET_FutureOr|_#new#tearOff(dynamic it) → self::ET_FutureOr /* = FutureOr<core::int>*/
   return self::ET_FutureOr|(it);
-static inline-class-member method ET_Extension|_#new#tearOff(dynamic it) → self::ET_Extension
+static inline-class-member method ET_Extension|_#new#tearOff(dynamic it) → self::ET_Extension /* = Never */
   return self::ET_Extension|(it);
-static inline-class-member method ET_Extension|(dynamic it) → self::ET_Extension {
-  lowered final self::ET_Extension #this = it;
+static inline-class-member method ET_Extension|(dynamic it) → self::ET_Extension /* = Never */ {
+  lowered final self::ET_Extension /* = Never */ #this = it;
   return #this;
 }
-static inline-class-member method ET_TypeVariable|<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|::T%> {
-  lowered final self::ET_TypeVariable<self::ET_TypeVariable|::T%> #this = it;
+static inline-class-member method ET_TypeVariable|<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|::T%> /* = self::ET_TypeVariable|::T% */ {
+  lowered final self::ET_TypeVariable<self::ET_TypeVariable|::T%> /* = self::ET_TypeVariable|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method ET_TypeVariable|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|_#new#tearOff::T%>
+static inline-class-member method ET_TypeVariable|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_TypeVariable<self::ET_TypeVariable|_#new#tearOff::T%> /* = self::ET_TypeVariable|_#new#tearOff::T% */
   return self::ET_TypeVariable|<self::ET_TypeVariable|_#new#tearOff::T%>(it);
-static inline-class-member method ET_Class|(dynamic it) → self::ET_Class {
-  lowered final self::ET_Class #this = it;
+static inline-class-member method ET_Class|(dynamic it) → self::ET_Class /* = self::Class */ {
+  lowered final self::ET_Class /* = self::Class */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Class|_#new#tearOff(dynamic it) → self::ET_Class
+static inline-class-member method ET_Class|_#new#tearOff(dynamic it) → self::ET_Class /* = self::Class */
   return self::ET_Class|(it);
-static inline-class-member method ET_GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|::T%> {
-  lowered final self::ET_GenericClass<self::ET_GenericClass|::T%> #this = it;
+static inline-class-member method ET_GenericClass|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|::T%> /* = self::GenericClass<self::ET_GenericClass|::T%> */ {
+  lowered final self::ET_GenericClass<self::ET_GenericClass|::T%> /* = self::GenericClass<self::ET_GenericClass|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method ET_GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|_#new#tearOff::T%>
+static inline-class-member method ET_GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericClass<self::ET_GenericClass|_#new#tearOff::T%> /* = self::GenericClass<self::ET_GenericClass|_#new#tearOff::T%> */
   return self::ET_GenericClass|<self::ET_GenericClass|_#new#tearOff::T%>(it);
-static inline-class-member method ET_Alias|(dynamic it) → self::ET_Alias {
-  lowered final self::ET_Alias #this = it;
+static inline-class-member method ET_Alias|(dynamic it) → self::ET_Alias /* = self::Class */ {
+  lowered final self::ET_Alias /* = self::Class */ #this = it;
   return #this;
 }
-static inline-class-member method ET_Alias|_#new#tearOff(dynamic it) → self::ET_Alias
+static inline-class-member method ET_Alias|_#new#tearOff(dynamic it) → self::ET_Alias /* = self::Class */
   return self::ET_Alias|(it);
-static inline-class-member method ET_GenericAlias|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|::T%> {
-  lowered final self::ET_GenericAlias<self::ET_GenericAlias|::T%> #this = it;
+static inline-class-member method ET_GenericAlias|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|::T%> /* = self::GenericClass<self::ET_GenericAlias|::T%> */ {
+  lowered final self::ET_GenericAlias<self::ET_GenericAlias|::T%> /* = self::GenericClass<self::ET_GenericAlias|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method ET_GenericAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|_#new#tearOff::T%>
+static inline-class-member method ET_GenericAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericAlias<self::ET_GenericAlias|_#new#tearOff::T%> /* = self::GenericClass<self::ET_GenericAlias|_#new#tearOff::T%> */
   return self::ET_GenericAlias|<self::ET_GenericAlias|_#new#tearOff::T%>(it);
-static inline-class-member method ET_ExtensionType|(dynamic it) → self::ET_ExtensionType {
-  lowered final self::ET_ExtensionType #this = it;
+static inline-class-member method ET_ExtensionType|(dynamic it) → self::ET_ExtensionType /* = core::int */ {
+  lowered final self::ET_ExtensionType /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method ET_ExtensionType|_#new#tearOff(dynamic it) → self::ET_ExtensionType
+static inline-class-member method ET_ExtensionType|_#new#tearOff(dynamic it) → self::ET_ExtensionType /* = core::int */
   return self::ET_ExtensionType|(it);
-static inline-class-member method ET_GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> {
-  lowered final self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> #this = it;
+static inline-class-member method ET_GenericExtensionType|<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> /* = self::ET_GenericExtensionType|::T% */ {
+  lowered final self::ET_GenericExtensionType<self::ET_GenericExtensionType|::T%> /* = self::ET_GenericExtensionType|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method ET_GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|_#new#tearOff::T%>
+static inline-class-member method ET_GenericExtensionType|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::ET_GenericExtensionType<self::ET_GenericExtensionType|_#new#tearOff::T%> /* = self::ET_GenericExtensionType|_#new#tearOff::T% */
   return self::ET_GenericExtensionType|<self::ET_GenericExtensionType|_#new#tearOff::T%>(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/implements.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/implements.dart.strong.expect
index 6aab37ca262..2174dfe034d 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/implements.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/implements.dart.strong.expect
@@ -212,75 +212,75 @@ extension type B<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::B|;
   tearoff • = self::B|_#new#tearOff;
 }
-extension type C1(core::int it) implements self::A {
+extension type C1(core::int it) implements self::A /* = core::int */ {
   method methodC1 = self::C1|methodC1;
   tearoff methodC1 = self::C1|get#methodC1;
   constructor • = self::C1|;
   tearoff • = self::C1|_#new#tearOff;
 }
-extension type C2(core::int it) implements self::A, self::B<core::int> {
+extension type C2(core::int it) implements self::A /* = core::int */, self::B<core::int> /* = core::int */ {
   method methodC2 = self::C2|methodC2;
   tearoff methodC2 = self::C2|get#methodC2;
   constructor • = self::C2|;
   tearoff • = self::C2|_#new#tearOff;
 }
-extension type D1(core::int it) implements self::C1 {
+extension type D1(core::int it) implements self::C1 /* = core::int */ {
   method methodD1 = self::D1|methodD1;
   tearoff methodD1 = self::D1|get#methodD1;
   constructor • = self::D1|;
   tearoff • = self::D1|_#new#tearOff;
 }
-static inline-class-member method A|(dynamic it) → self::A {
-  lowered final self::A #this = it;
+static inline-class-member method A|(dynamic it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(dynamic it) → self::A
+static inline-class-member method A|_#new#tearOff(dynamic it) → self::A /* = core::int */
   return self::A|(it);
-static inline-class-member method A|methodA(lowered final self::A #this) → core::int
+static inline-class-member method A|methodA(lowered final self::A /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(5){(core::num) → core::int};
-static inline-class-member method A|get#methodA(lowered final self::A #this) → () → core::int
+static inline-class-member method A|get#methodA(lowered final self::A /* = core::int */ #this) → () → core::int
   return () → core::int => self::A|methodA(#this);
-static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> /* = self::B|::T% */ {
+  lowered final self::B<self::B|::T%> /* = self::B|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%> /* = self::B|_#new#tearOff::T% */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
+static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> /* = self::B|methodB::T% */ #this) → self::B|methodB::T%
   return #this as{Unchecked} self::B|methodB::T%;
-static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
+static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> /* = self::B|get#methodB::T% */ #this) → () → self::B|get#methodB::T%
   return () → self::B|get#methodB::T% => self::B|methodB<self::B|get#methodB::T%>(#this);
-static inline-class-member method C1|(dynamic it) → self::C1 {
-  lowered final self::C1 #this = it;
+static inline-class-member method C1|(dynamic it) → self::C1 /* = core::int */ {
+  lowered final self::C1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C1|_#new#tearOff(dynamic it) → self::C1
+static inline-class-member method C1|_#new#tearOff(dynamic it) → self::C1 /* = core::int */
   return self::C1|(it);
-static inline-class-member method C1|methodC1(lowered final self::C1 #this) → core::int
+static inline-class-member method C1|methodC1(lowered final self::C1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(42){(core::num) → core::int};
-static inline-class-member method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
+static inline-class-member method C1|get#methodC1(lowered final self::C1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C1|methodC1(#this);
-static inline-class-member method C2|(dynamic it) → self::C2 {
-  lowered final self::C2 #this = it;
+static inline-class-member method C2|(dynamic it) → self::C2 /* = core::int */ {
+  lowered final self::C2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C2|_#new#tearOff(dynamic it) → self::C2
+static inline-class-member method C2|_#new#tearOff(dynamic it) → self::C2 /* = core::int */
   return self::C2|(it);
-static inline-class-member method C2|methodC2(lowered final self::C2 #this) → core::int
+static inline-class-member method C2|methodC2(lowered final self::C2 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(87){(core::num) → core::int};
-static inline-class-member method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
+static inline-class-member method C2|get#methodC2(lowered final self::C2 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C2|methodC2(#this);
-static inline-class-member method D1|(dynamic it) → self::D1 {
-  lowered final self::D1 #this = it;
+static inline-class-member method D1|(dynamic it) → self::D1 /* = core::int */ {
+  lowered final self::D1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D1|_#new#tearOff(dynamic it) → self::D1
+static inline-class-member method D1|_#new#tearOff(dynamic it) → self::D1 /* = core::int */
   return self::D1|(it);
-static inline-class-member method D1|methodD1(lowered final self::D1 #this) → core::int
+static inline-class-member method D1|methodD1(lowered final self::D1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(123){(core::num) → core::int};
-static inline-class-member method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
+static inline-class-member method D1|get#methodD1(lowered final self::D1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::D1|methodD1(#this);
-static method errors(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method errors(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:26:5: Error: The method 'methodB' isn't defined for the class 'A'.
 Try correcting the name to the name of an existing method, or defining a method named 'methodB'.
   a.methodB(); // Error
@@ -359,81 +359,81 @@ Try correcting the name to the name of an existing method, or defining a method
      ^^^^^^^^" in d1{<unresolved>}.methodC2();
   a = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:51:7: Error: A value of type 'B<String>' can't be assigned to a variable of type 'A'.
   a = b1; // Error
-      ^" in b1 as{TypeError} self::A;
+      ^" in b1 as{TypeError} self::A /* = core::int */;
   a = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:52:7: Error: A value of type 'B<num>' can't be assigned to a variable of type 'A'.
   a = b2; // Error
-      ^" in b2 as{TypeError} self::A;
+      ^" in b2 as{TypeError} self::A /* = core::int */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:54:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<String>'.
   b1 = a; // Error
-       ^" in a as{TypeError} self::B<core::String>;
+       ^" in a as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:55:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'B<String>'.
   b1 = b2; // Error
-       ^" in b2 as{TypeError} self::B<core::String>;
+       ^" in b2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:56:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<String>'.
   b1 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::String>;
+       ^" in c1 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:57:8: Error: A value of type 'C2' can't be assigned to a variable of type 'B<String>'.
   b1 = c2; // Error
-       ^" in c2 as{TypeError} self::B<core::String>;
+       ^" in c2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:58:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<String>'.
   b1 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::String>;
+       ^" in d1 as{TypeError} self::B<core::String> /* = core::String */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:60:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<num>'.
   b2 = a; // Error
-       ^" in a as{TypeError} self::B<core::num>;
+       ^" in a as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:61:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'B<num>'.
   b2 = b1; // Error
-       ^" in b1 as{TypeError} self::B<core::num>;
+       ^" in b1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:62:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<num>'.
   b2 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::num>;
+       ^" in c1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:63:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<num>'.
   b2 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::num>;
+       ^" in d1 as{TypeError} self::B<core::num> /* = core::num */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:65:8: Error: A value of type 'A' can't be assigned to a variable of type 'C1'.
   c1 = a; // Error
-       ^" in a as{TypeError} self::C1;
+       ^" in a as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:66:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C1'.
   c1 = b1; // Error
-       ^" in b1 as{TypeError} self::C1;
+       ^" in b1 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:67:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C1'.
   c1 = b2; // Error
-       ^" in b2 as{TypeError} self::C1;
+       ^" in b2 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:68:8: Error: A value of type 'C2' can't be assigned to a variable of type 'C1'.
   c1 = c2; // Error
-       ^" in c2 as{TypeError} self::C1;
+       ^" in c2 as{TypeError} self::C1 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:70:8: Error: A value of type 'A' can't be assigned to a variable of type 'C2'.
   c2 = a; // Error
-       ^" in a as{TypeError} self::C2;
+       ^" in a as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:71:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C2'.
   c2 = b1; // Error
-       ^" in b1 as{TypeError} self::C2;
+       ^" in b1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:72:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C2'.
   c2 = b2; // Error
-       ^" in b2 as{TypeError} self::C2;
+       ^" in b2 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:73:8: Error: A value of type 'C1' can't be assigned to a variable of type 'C2'.
   c2 = c1; // Error
-       ^" in c1 as{TypeError} self::C2;
+       ^" in c1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:74:8: Error: A value of type 'D1' can't be assigned to a variable of type 'C2'.
   c2 = d1; // Error
-       ^" in d1 as{TypeError} self::C2;
+       ^" in d1 as{TypeError} self::C2 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:76:8: Error: A value of type 'A' can't be assigned to a variable of type 'D1'.
   d1 = a; // Error
-       ^" in a as{TypeError} self::D1;
+       ^" in a as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:77:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'D1'.
   d1 = b1; // Error
-       ^" in b1 as{TypeError} self::D1;
+       ^" in b1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:78:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'D1'.
   d1 = b2; // Error
-       ^" in b2 as{TypeError} self::D1;
+       ^" in b2 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:79:8: Error: A value of type 'C1' can't be assigned to a variable of type 'D1'.
   d1 = c1; // Error
-       ^" in c1 as{TypeError} self::D1;
+       ^" in c1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:80:8: Error: A value of type 'C2' can't be assigned to a variable of type 'D1'.
   d1 = c2; // Error
-       ^" in c2 as{TypeError} self::D1;
+       ^" in c2 as{TypeError} self::D1 /* = core::int */;
 }
-static method method(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method method(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   self::expect(0.{core::num::+}(5){(core::num) → core::int}, self::A|methodA(a));
   self::expect("0", self::B|methodB<core::String>(b1));
   self::expect(1.{core::num::+}(0){(core::num) → core::int}, self::B|methodB<core::num>(b2));
diff --git a/pkg/front_end/testcases/inline_class/extension_types/implements.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/implements.dart.strong.transformed.expect
index 2a378e19eab..570ebd2fb4a 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/implements.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/implements.dart.strong.transformed.expect
@@ -212,75 +212,75 @@ extension type B<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::B|;
   tearoff • = self::B|_#new#tearOff;
 }
-extension type C1(core::int it) implements self::A {
+extension type C1(core::int it) implements self::A /* = core::int */ {
   method methodC1 = self::C1|methodC1;
   tearoff methodC1 = self::C1|get#methodC1;
   constructor • = self::C1|;
   tearoff • = self::C1|_#new#tearOff;
 }
-extension type C2(core::int it) implements self::A, self::B<core::int> {
+extension type C2(core::int it) implements self::A /* = core::int */, self::B<core::int> /* = core::int */ {
   method methodC2 = self::C2|methodC2;
   tearoff methodC2 = self::C2|get#methodC2;
   constructor • = self::C2|;
   tearoff • = self::C2|_#new#tearOff;
 }
-extension type D1(core::int it) implements self::C1 {
+extension type D1(core::int it) implements self::C1 /* = core::int */ {
   method methodD1 = self::D1|methodD1;
   tearoff methodD1 = self::D1|get#methodD1;
   constructor • = self::D1|;
   tearoff • = self::D1|_#new#tearOff;
 }
-static inline-class-member method A|(dynamic it) → self::A {
-  lowered final self::A #this = it;
+static inline-class-member method A|(dynamic it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(dynamic it) → self::A
+static inline-class-member method A|_#new#tearOff(dynamic it) → self::A /* = core::int */
   return self::A|(it);
-static inline-class-member method A|methodA(lowered final self::A #this) → core::int
+static inline-class-member method A|methodA(lowered final self::A /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(5){(core::num) → core::int};
-static inline-class-member method A|get#methodA(lowered final self::A #this) → () → core::int
+static inline-class-member method A|get#methodA(lowered final self::A /* = core::int */ #this) → () → core::int
   return () → core::int => self::A|methodA(#this);
-static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> /* = self::B|::T% */ {
+  lowered final self::B<self::B|::T%> /* = self::B|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%> /* = self::B|_#new#tearOff::T% */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
+static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> /* = self::B|methodB::T% */ #this) → self::B|methodB::T%
   return #this as{Unchecked} self::B|methodB::T%;
-static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
+static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> /* = self::B|get#methodB::T% */ #this) → () → self::B|get#methodB::T%
   return () → self::B|get#methodB::T% => self::B|methodB<self::B|get#methodB::T%>(#this);
-static inline-class-member method C1|(dynamic it) → self::C1 {
-  lowered final self::C1 #this = it;
+static inline-class-member method C1|(dynamic it) → self::C1 /* = core::int */ {
+  lowered final self::C1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C1|_#new#tearOff(dynamic it) → self::C1
+static inline-class-member method C1|_#new#tearOff(dynamic it) → self::C1 /* = core::int */
   return self::C1|(it);
-static inline-class-member method C1|methodC1(lowered final self::C1 #this) → core::int
+static inline-class-member method C1|methodC1(lowered final self::C1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(42){(core::num) → core::int};
-static inline-class-member method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
+static inline-class-member method C1|get#methodC1(lowered final self::C1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C1|methodC1(#this);
-static inline-class-member method C2|(dynamic it) → self::C2 {
-  lowered final self::C2 #this = it;
+static inline-class-member method C2|(dynamic it) → self::C2 /* = core::int */ {
+  lowered final self::C2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C2|_#new#tearOff(dynamic it) → self::C2
+static inline-class-member method C2|_#new#tearOff(dynamic it) → self::C2 /* = core::int */
   return self::C2|(it);
-static inline-class-member method C2|methodC2(lowered final self::C2 #this) → core::int
+static inline-class-member method C2|methodC2(lowered final self::C2 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(87){(core::num) → core::int};
-static inline-class-member method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
+static inline-class-member method C2|get#methodC2(lowered final self::C2 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C2|methodC2(#this);
-static inline-class-member method D1|(dynamic it) → self::D1 {
-  lowered final self::D1 #this = it;
+static inline-class-member method D1|(dynamic it) → self::D1 /* = core::int */ {
+  lowered final self::D1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D1|_#new#tearOff(dynamic it) → self::D1
+static inline-class-member method D1|_#new#tearOff(dynamic it) → self::D1 /* = core::int */
   return self::D1|(it);
-static inline-class-member method D1|methodD1(lowered final self::D1 #this) → core::int
+static inline-class-member method D1|methodD1(lowered final self::D1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(123){(core::num) → core::int};
-static inline-class-member method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
+static inline-class-member method D1|get#methodD1(lowered final self::D1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::D1|methodD1(#this);
-static method errors(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method errors(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:26:5: Error: The method 'methodB' isn't defined for the class 'A'.
 Try correcting the name to the name of an existing method, or defining a method named 'methodB'.
   a.methodB(); // Error
@@ -359,81 +359,81 @@ Try correcting the name to the name of an existing method, or defining a method
      ^^^^^^^^" in d1{<unresolved>}.methodC2();
   a = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:51:7: Error: A value of type 'B<String>' can't be assigned to a variable of type 'A'.
   a = b1; // Error
-      ^" in b1 as{TypeError} self::A;
+      ^" in b1 as{TypeError} self::A /* = core::int */;
   a = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:52:7: Error: A value of type 'B<num>' can't be assigned to a variable of type 'A'.
   a = b2; // Error
-      ^" in b2 as{TypeError} self::A;
+      ^" in b2 as{TypeError} self::A /* = core::int */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:54:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<String>'.
   b1 = a; // Error
-       ^" in a as{TypeError} self::B<core::String>;
+       ^" in a as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:55:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'B<String>'.
   b1 = b2; // Error
-       ^" in b2 as{TypeError} self::B<core::String>;
+       ^" in b2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:56:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<String>'.
   b1 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::String>;
+       ^" in c1 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:57:8: Error: A value of type 'C2' can't be assigned to a variable of type 'B<String>'.
   b1 = c2; // Error
-       ^" in c2 as{TypeError} self::B<core::String>;
+       ^" in c2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:58:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<String>'.
   b1 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::String>;
+       ^" in d1 as{TypeError} self::B<core::String> /* = core::String */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:60:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<num>'.
   b2 = a; // Error
-       ^" in a as{TypeError} self::B<core::num>;
+       ^" in a as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:61:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'B<num>'.
   b2 = b1; // Error
-       ^" in b1 as{TypeError} self::B<core::num>;
+       ^" in b1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:62:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<num>'.
   b2 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::num>;
+       ^" in c1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:63:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<num>'.
   b2 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::num>;
+       ^" in d1 as{TypeError} self::B<core::num> /* = core::num */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:65:8: Error: A value of type 'A' can't be assigned to a variable of type 'C1'.
   c1 = a; // Error
-       ^" in a as{TypeError} self::C1;
+       ^" in a as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:66:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C1'.
   c1 = b1; // Error
-       ^" in b1 as{TypeError} self::C1;
+       ^" in b1 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:67:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C1'.
   c1 = b2; // Error
-       ^" in b2 as{TypeError} self::C1;
+       ^" in b2 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:68:8: Error: A value of type 'C2' can't be assigned to a variable of type 'C1'.
   c1 = c2; // Error
-       ^" in c2 as{TypeError} self::C1;
+       ^" in c2 as{TypeError} self::C1 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:70:8: Error: A value of type 'A' can't be assigned to a variable of type 'C2'.
   c2 = a; // Error
-       ^" in a as{TypeError} self::C2;
+       ^" in a as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:71:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C2'.
   c2 = b1; // Error
-       ^" in b1 as{TypeError} self::C2;
+       ^" in b1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:72:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C2'.
   c2 = b2; // Error
-       ^" in b2 as{TypeError} self::C2;
+       ^" in b2 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:73:8: Error: A value of type 'C1' can't be assigned to a variable of type 'C2'.
   c2 = c1; // Error
-       ^" in c1 as{TypeError} self::C2;
+       ^" in c1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:74:8: Error: A value of type 'D1' can't be assigned to a variable of type 'C2'.
   c2 = d1; // Error
-       ^" in d1 as{TypeError} self::C2;
+       ^" in d1 as{TypeError} self::C2 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:76:8: Error: A value of type 'A' can't be assigned to a variable of type 'D1'.
   d1 = a; // Error
-       ^" in a as{TypeError} self::D1;
+       ^" in a as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:77:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'D1'.
   d1 = b1; // Error
-       ^" in b1 as{TypeError} self::D1;
+       ^" in b1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:78:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'D1'.
   d1 = b2; // Error
-       ^" in b2 as{TypeError} self::D1;
+       ^" in b2 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:79:8: Error: A value of type 'C1' can't be assigned to a variable of type 'D1'.
   d1 = c1; // Error
-       ^" in c1 as{TypeError} self::D1;
+       ^" in c1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:80:8: Error: A value of type 'C2' can't be assigned to a variable of type 'D1'.
   d1 = c2; // Error
-       ^" in c2 as{TypeError} self::D1;
+       ^" in c2 as{TypeError} self::D1 /* = core::int */;
 }
-static method method(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method method(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   self::expect(0.{core::num::+}(5){(core::num) → core::int}, self::A|methodA(a));
   self::expect("0", self::B|methodB<core::String>(b1));
   self::expect(1.{core::num::+}(0){(core::num) → core::int}, self::B|methodB<core::num>(b2));
diff --git a/pkg/front_end/testcases/inline_class/extension_types/implements.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/implements.dart.weak.expect
index 6aab37ca262..2174dfe034d 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/implements.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/implements.dart.weak.expect
@@ -212,75 +212,75 @@ extension type B<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::B|;
   tearoff • = self::B|_#new#tearOff;
 }
-extension type C1(core::int it) implements self::A {
+extension type C1(core::int it) implements self::A /* = core::int */ {
   method methodC1 = self::C1|methodC1;
   tearoff methodC1 = self::C1|get#methodC1;
   constructor • = self::C1|;
   tearoff • = self::C1|_#new#tearOff;
 }
-extension type C2(core::int it) implements self::A, self::B<core::int> {
+extension type C2(core::int it) implements self::A /* = core::int */, self::B<core::int> /* = core::int */ {
   method methodC2 = self::C2|methodC2;
   tearoff methodC2 = self::C2|get#methodC2;
   constructor • = self::C2|;
   tearoff • = self::C2|_#new#tearOff;
 }
-extension type D1(core::int it) implements self::C1 {
+extension type D1(core::int it) implements self::C1 /* = core::int */ {
   method methodD1 = self::D1|methodD1;
   tearoff methodD1 = self::D1|get#methodD1;
   constructor • = self::D1|;
   tearoff • = self::D1|_#new#tearOff;
 }
-static inline-class-member method A|(dynamic it) → self::A {
-  lowered final self::A #this = it;
+static inline-class-member method A|(dynamic it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(dynamic it) → self::A
+static inline-class-member method A|_#new#tearOff(dynamic it) → self::A /* = core::int */
   return self::A|(it);
-static inline-class-member method A|methodA(lowered final self::A #this) → core::int
+static inline-class-member method A|methodA(lowered final self::A /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(5){(core::num) → core::int};
-static inline-class-member method A|get#methodA(lowered final self::A #this) → () → core::int
+static inline-class-member method A|get#methodA(lowered final self::A /* = core::int */ #this) → () → core::int
   return () → core::int => self::A|methodA(#this);
-static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> /* = self::B|::T% */ {
+  lowered final self::B<self::B|::T%> /* = self::B|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%> /* = self::B|_#new#tearOff::T% */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
+static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> /* = self::B|methodB::T% */ #this) → self::B|methodB::T%
   return #this as{Unchecked} self::B|methodB::T%;
-static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
+static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> /* = self::B|get#methodB::T% */ #this) → () → self::B|get#methodB::T%
   return () → self::B|get#methodB::T% => self::B|methodB<self::B|get#methodB::T%>(#this);
-static inline-class-member method C1|(dynamic it) → self::C1 {
-  lowered final self::C1 #this = it;
+static inline-class-member method C1|(dynamic it) → self::C1 /* = core::int */ {
+  lowered final self::C1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C1|_#new#tearOff(dynamic it) → self::C1
+static inline-class-member method C1|_#new#tearOff(dynamic it) → self::C1 /* = core::int */
   return self::C1|(it);
-static inline-class-member method C1|methodC1(lowered final self::C1 #this) → core::int
+static inline-class-member method C1|methodC1(lowered final self::C1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(42){(core::num) → core::int};
-static inline-class-member method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
+static inline-class-member method C1|get#methodC1(lowered final self::C1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C1|methodC1(#this);
-static inline-class-member method C2|(dynamic it) → self::C2 {
-  lowered final self::C2 #this = it;
+static inline-class-member method C2|(dynamic it) → self::C2 /* = core::int */ {
+  lowered final self::C2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C2|_#new#tearOff(dynamic it) → self::C2
+static inline-class-member method C2|_#new#tearOff(dynamic it) → self::C2 /* = core::int */
   return self::C2|(it);
-static inline-class-member method C2|methodC2(lowered final self::C2 #this) → core::int
+static inline-class-member method C2|methodC2(lowered final self::C2 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(87){(core::num) → core::int};
-static inline-class-member method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
+static inline-class-member method C2|get#methodC2(lowered final self::C2 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C2|methodC2(#this);
-static inline-class-member method D1|(dynamic it) → self::D1 {
-  lowered final self::D1 #this = it;
+static inline-class-member method D1|(dynamic it) → self::D1 /* = core::int */ {
+  lowered final self::D1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D1|_#new#tearOff(dynamic it) → self::D1
+static inline-class-member method D1|_#new#tearOff(dynamic it) → self::D1 /* = core::int */
   return self::D1|(it);
-static inline-class-member method D1|methodD1(lowered final self::D1 #this) → core::int
+static inline-class-member method D1|methodD1(lowered final self::D1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(123){(core::num) → core::int};
-static inline-class-member method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
+static inline-class-member method D1|get#methodD1(lowered final self::D1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::D1|methodD1(#this);
-static method errors(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method errors(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:26:5: Error: The method 'methodB' isn't defined for the class 'A'.
 Try correcting the name to the name of an existing method, or defining a method named 'methodB'.
   a.methodB(); // Error
@@ -359,81 +359,81 @@ Try correcting the name to the name of an existing method, or defining a method
      ^^^^^^^^" in d1{<unresolved>}.methodC2();
   a = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:51:7: Error: A value of type 'B<String>' can't be assigned to a variable of type 'A'.
   a = b1; // Error
-      ^" in b1 as{TypeError} self::A;
+      ^" in b1 as{TypeError} self::A /* = core::int */;
   a = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:52:7: Error: A value of type 'B<num>' can't be assigned to a variable of type 'A'.
   a = b2; // Error
-      ^" in b2 as{TypeError} self::A;
+      ^" in b2 as{TypeError} self::A /* = core::int */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:54:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<String>'.
   b1 = a; // Error
-       ^" in a as{TypeError} self::B<core::String>;
+       ^" in a as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:55:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'B<String>'.
   b1 = b2; // Error
-       ^" in b2 as{TypeError} self::B<core::String>;
+       ^" in b2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:56:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<String>'.
   b1 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::String>;
+       ^" in c1 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:57:8: Error: A value of type 'C2' can't be assigned to a variable of type 'B<String>'.
   b1 = c2; // Error
-       ^" in c2 as{TypeError} self::B<core::String>;
+       ^" in c2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:58:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<String>'.
   b1 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::String>;
+       ^" in d1 as{TypeError} self::B<core::String> /* = core::String */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:60:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<num>'.
   b2 = a; // Error
-       ^" in a as{TypeError} self::B<core::num>;
+       ^" in a as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:61:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'B<num>'.
   b2 = b1; // Error
-       ^" in b1 as{TypeError} self::B<core::num>;
+       ^" in b1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:62:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<num>'.
   b2 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::num>;
+       ^" in c1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:63:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<num>'.
   b2 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::num>;
+       ^" in d1 as{TypeError} self::B<core::num> /* = core::num */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:65:8: Error: A value of type 'A' can't be assigned to a variable of type 'C1'.
   c1 = a; // Error
-       ^" in a as{TypeError} self::C1;
+       ^" in a as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:66:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C1'.
   c1 = b1; // Error
-       ^" in b1 as{TypeError} self::C1;
+       ^" in b1 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:67:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C1'.
   c1 = b2; // Error
-       ^" in b2 as{TypeError} self::C1;
+       ^" in b2 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:68:8: Error: A value of type 'C2' can't be assigned to a variable of type 'C1'.
   c1 = c2; // Error
-       ^" in c2 as{TypeError} self::C1;
+       ^" in c2 as{TypeError} self::C1 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:70:8: Error: A value of type 'A' can't be assigned to a variable of type 'C2'.
   c2 = a; // Error
-       ^" in a as{TypeError} self::C2;
+       ^" in a as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:71:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C2'.
   c2 = b1; // Error
-       ^" in b1 as{TypeError} self::C2;
+       ^" in b1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:72:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C2'.
   c2 = b2; // Error
-       ^" in b2 as{TypeError} self::C2;
+       ^" in b2 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:73:8: Error: A value of type 'C1' can't be assigned to a variable of type 'C2'.
   c2 = c1; // Error
-       ^" in c1 as{TypeError} self::C2;
+       ^" in c1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:74:8: Error: A value of type 'D1' can't be assigned to a variable of type 'C2'.
   c2 = d1; // Error
-       ^" in d1 as{TypeError} self::C2;
+       ^" in d1 as{TypeError} self::C2 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:76:8: Error: A value of type 'A' can't be assigned to a variable of type 'D1'.
   d1 = a; // Error
-       ^" in a as{TypeError} self::D1;
+       ^" in a as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:77:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'D1'.
   d1 = b1; // Error
-       ^" in b1 as{TypeError} self::D1;
+       ^" in b1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:78:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'D1'.
   d1 = b2; // Error
-       ^" in b2 as{TypeError} self::D1;
+       ^" in b2 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:79:8: Error: A value of type 'C1' can't be assigned to a variable of type 'D1'.
   d1 = c1; // Error
-       ^" in c1 as{TypeError} self::D1;
+       ^" in c1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:80:8: Error: A value of type 'C2' can't be assigned to a variable of type 'D1'.
   d1 = c2; // Error
-       ^" in c2 as{TypeError} self::D1;
+       ^" in c2 as{TypeError} self::D1 /* = core::int */;
 }
-static method method(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method method(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   self::expect(0.{core::num::+}(5){(core::num) → core::int}, self::A|methodA(a));
   self::expect("0", self::B|methodB<core::String>(b1));
   self::expect(1.{core::num::+}(0){(core::num) → core::int}, self::B|methodB<core::num>(b2));
diff --git a/pkg/front_end/testcases/inline_class/extension_types/implements.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/implements.dart.weak.modular.expect
index 6aab37ca262..2174dfe034d 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/implements.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/implements.dart.weak.modular.expect
@@ -212,75 +212,75 @@ extension type B<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::B|;
   tearoff • = self::B|_#new#tearOff;
 }
-extension type C1(core::int it) implements self::A {
+extension type C1(core::int it) implements self::A /* = core::int */ {
   method methodC1 = self::C1|methodC1;
   tearoff methodC1 = self::C1|get#methodC1;
   constructor • = self::C1|;
   tearoff • = self::C1|_#new#tearOff;
 }
-extension type C2(core::int it) implements self::A, self::B<core::int> {
+extension type C2(core::int it) implements self::A /* = core::int */, self::B<core::int> /* = core::int */ {
   method methodC2 = self::C2|methodC2;
   tearoff methodC2 = self::C2|get#methodC2;
   constructor • = self::C2|;
   tearoff • = self::C2|_#new#tearOff;
 }
-extension type D1(core::int it) implements self::C1 {
+extension type D1(core::int it) implements self::C1 /* = core::int */ {
   method methodD1 = self::D1|methodD1;
   tearoff methodD1 = self::D1|get#methodD1;
   constructor • = self::D1|;
   tearoff • = self::D1|_#new#tearOff;
 }
-static inline-class-member method A|(dynamic it) → self::A {
-  lowered final self::A #this = it;
+static inline-class-member method A|(dynamic it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(dynamic it) → self::A
+static inline-class-member method A|_#new#tearOff(dynamic it) → self::A /* = core::int */
   return self::A|(it);
-static inline-class-member method A|methodA(lowered final self::A #this) → core::int
+static inline-class-member method A|methodA(lowered final self::A /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(5){(core::num) → core::int};
-static inline-class-member method A|get#methodA(lowered final self::A #this) → () → core::int
+static inline-class-member method A|get#methodA(lowered final self::A /* = core::int */ #this) → () → core::int
   return () → core::int => self::A|methodA(#this);
-static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> /* = self::B|::T% */ {
+  lowered final self::B<self::B|::T%> /* = self::B|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%> /* = self::B|_#new#tearOff::T% */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
+static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> /* = self::B|methodB::T% */ #this) → self::B|methodB::T%
   return #this as{Unchecked} self::B|methodB::T%;
-static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
+static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> /* = self::B|get#methodB::T% */ #this) → () → self::B|get#methodB::T%
   return () → self::B|get#methodB::T% => self::B|methodB<self::B|get#methodB::T%>(#this);
-static inline-class-member method C1|(dynamic it) → self::C1 {
-  lowered final self::C1 #this = it;
+static inline-class-member method C1|(dynamic it) → self::C1 /* = core::int */ {
+  lowered final self::C1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C1|_#new#tearOff(dynamic it) → self::C1
+static inline-class-member method C1|_#new#tearOff(dynamic it) → self::C1 /* = core::int */
   return self::C1|(it);
-static inline-class-member method C1|methodC1(lowered final self::C1 #this) → core::int
+static inline-class-member method C1|methodC1(lowered final self::C1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(42){(core::num) → core::int};
-static inline-class-member method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
+static inline-class-member method C1|get#methodC1(lowered final self::C1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C1|methodC1(#this);
-static inline-class-member method C2|(dynamic it) → self::C2 {
-  lowered final self::C2 #this = it;
+static inline-class-member method C2|(dynamic it) → self::C2 /* = core::int */ {
+  lowered final self::C2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C2|_#new#tearOff(dynamic it) → self::C2
+static inline-class-member method C2|_#new#tearOff(dynamic it) → self::C2 /* = core::int */
   return self::C2|(it);
-static inline-class-member method C2|methodC2(lowered final self::C2 #this) → core::int
+static inline-class-member method C2|methodC2(lowered final self::C2 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(87){(core::num) → core::int};
-static inline-class-member method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
+static inline-class-member method C2|get#methodC2(lowered final self::C2 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C2|methodC2(#this);
-static inline-class-member method D1|(dynamic it) → self::D1 {
-  lowered final self::D1 #this = it;
+static inline-class-member method D1|(dynamic it) → self::D1 /* = core::int */ {
+  lowered final self::D1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D1|_#new#tearOff(dynamic it) → self::D1
+static inline-class-member method D1|_#new#tearOff(dynamic it) → self::D1 /* = core::int */
   return self::D1|(it);
-static inline-class-member method D1|methodD1(lowered final self::D1 #this) → core::int
+static inline-class-member method D1|methodD1(lowered final self::D1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(123){(core::num) → core::int};
-static inline-class-member method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
+static inline-class-member method D1|get#methodD1(lowered final self::D1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::D1|methodD1(#this);
-static method errors(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method errors(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:26:5: Error: The method 'methodB' isn't defined for the class 'A'.
 Try correcting the name to the name of an existing method, or defining a method named 'methodB'.
   a.methodB(); // Error
@@ -359,81 +359,81 @@ Try correcting the name to the name of an existing method, or defining a method
      ^^^^^^^^" in d1{<unresolved>}.methodC2();
   a = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:51:7: Error: A value of type 'B<String>' can't be assigned to a variable of type 'A'.
   a = b1; // Error
-      ^" in b1 as{TypeError} self::A;
+      ^" in b1 as{TypeError} self::A /* = core::int */;
   a = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:52:7: Error: A value of type 'B<num>' can't be assigned to a variable of type 'A'.
   a = b2; // Error
-      ^" in b2 as{TypeError} self::A;
+      ^" in b2 as{TypeError} self::A /* = core::int */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:54:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<String>'.
   b1 = a; // Error
-       ^" in a as{TypeError} self::B<core::String>;
+       ^" in a as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:55:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'B<String>'.
   b1 = b2; // Error
-       ^" in b2 as{TypeError} self::B<core::String>;
+       ^" in b2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:56:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<String>'.
   b1 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::String>;
+       ^" in c1 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:57:8: Error: A value of type 'C2' can't be assigned to a variable of type 'B<String>'.
   b1 = c2; // Error
-       ^" in c2 as{TypeError} self::B<core::String>;
+       ^" in c2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:58:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<String>'.
   b1 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::String>;
+       ^" in d1 as{TypeError} self::B<core::String> /* = core::String */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:60:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<num>'.
   b2 = a; // Error
-       ^" in a as{TypeError} self::B<core::num>;
+       ^" in a as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:61:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'B<num>'.
   b2 = b1; // Error
-       ^" in b1 as{TypeError} self::B<core::num>;
+       ^" in b1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:62:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<num>'.
   b2 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::num>;
+       ^" in c1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:63:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<num>'.
   b2 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::num>;
+       ^" in d1 as{TypeError} self::B<core::num> /* = core::num */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:65:8: Error: A value of type 'A' can't be assigned to a variable of type 'C1'.
   c1 = a; // Error
-       ^" in a as{TypeError} self::C1;
+       ^" in a as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:66:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C1'.
   c1 = b1; // Error
-       ^" in b1 as{TypeError} self::C1;
+       ^" in b1 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:67:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C1'.
   c1 = b2; // Error
-       ^" in b2 as{TypeError} self::C1;
+       ^" in b2 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:68:8: Error: A value of type 'C2' can't be assigned to a variable of type 'C1'.
   c1 = c2; // Error
-       ^" in c2 as{TypeError} self::C1;
+       ^" in c2 as{TypeError} self::C1 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:70:8: Error: A value of type 'A' can't be assigned to a variable of type 'C2'.
   c2 = a; // Error
-       ^" in a as{TypeError} self::C2;
+       ^" in a as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:71:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C2'.
   c2 = b1; // Error
-       ^" in b1 as{TypeError} self::C2;
+       ^" in b1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:72:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C2'.
   c2 = b2; // Error
-       ^" in b2 as{TypeError} self::C2;
+       ^" in b2 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:73:8: Error: A value of type 'C1' can't be assigned to a variable of type 'C2'.
   c2 = c1; // Error
-       ^" in c1 as{TypeError} self::C2;
+       ^" in c1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:74:8: Error: A value of type 'D1' can't be assigned to a variable of type 'C2'.
   c2 = d1; // Error
-       ^" in d1 as{TypeError} self::C2;
+       ^" in d1 as{TypeError} self::C2 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:76:8: Error: A value of type 'A' can't be assigned to a variable of type 'D1'.
   d1 = a; // Error
-       ^" in a as{TypeError} self::D1;
+       ^" in a as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:77:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'D1'.
   d1 = b1; // Error
-       ^" in b1 as{TypeError} self::D1;
+       ^" in b1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:78:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'D1'.
   d1 = b2; // Error
-       ^" in b2 as{TypeError} self::D1;
+       ^" in b2 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:79:8: Error: A value of type 'C1' can't be assigned to a variable of type 'D1'.
   d1 = c1; // Error
-       ^" in c1 as{TypeError} self::D1;
+       ^" in c1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:80:8: Error: A value of type 'C2' can't be assigned to a variable of type 'D1'.
   d1 = c2; // Error
-       ^" in c2 as{TypeError} self::D1;
+       ^" in c2 as{TypeError} self::D1 /* = core::int */;
 }
-static method method(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method method(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   self::expect(0.{core::num::+}(5){(core::num) → core::int}, self::A|methodA(a));
   self::expect("0", self::B|methodB<core::String>(b1));
   self::expect(1.{core::num::+}(0){(core::num) → core::int}, self::B|methodB<core::num>(b2));
diff --git a/pkg/front_end/testcases/inline_class/extension_types/implements.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/implements.dart.weak.outline.expect
index d39e440d005..90e936a7584 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/implements.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/implements.dart.weak.outline.expect
@@ -14,67 +14,67 @@ extension type B<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::B|;
   tearoff • = self::B|_#new#tearOff;
 }
-extension type C1(core::int it) implements self::A {
+extension type C1(core::int it) implements self::A /* = core::int */ {
   method methodC1 = self::C1|methodC1;
   tearoff methodC1 = self::C1|get#methodC1;
   constructor • = self::C1|;
   tearoff • = self::C1|_#new#tearOff;
 }
-extension type C2(core::int it) implements self::A, self::B<core::int> {
+extension type C2(core::int it) implements self::A /* = core::int */, self::B<core::int> /* = core::int */ {
   method methodC2 = self::C2|methodC2;
   tearoff methodC2 = self::C2|get#methodC2;
   constructor • = self::C2|;
   tearoff • = self::C2|_#new#tearOff;
 }
-extension type D1(core::int it) implements self::C1 {
+extension type D1(core::int it) implements self::C1 /* = core::int */ {
   method methodD1 = self::D1|methodD1;
   tearoff methodD1 = self::D1|get#methodD1;
   constructor • = self::D1|;
   tearoff • = self::D1|_#new#tearOff;
 }
-static inline-class-member method A|(dynamic it) → self::A
+static inline-class-member method A|(dynamic it) → self::A /* = core::int */
   ;
-static inline-class-member method A|_#new#tearOff(dynamic it) → self::A
+static inline-class-member method A|_#new#tearOff(dynamic it) → self::A /* = core::int */
   return self::A|(it);
-static inline-class-member method A|methodA(lowered final self::A #this) → core::int
+static inline-class-member method A|methodA(lowered final self::A /* = core::int */ #this) → core::int
   ;
-static inline-class-member method A|get#methodA(lowered final self::A #this) → () → core::int
+static inline-class-member method A|get#methodA(lowered final self::A /* = core::int */ #this) → () → core::int
   return () → core::int => self::A|methodA(#this);
-static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%>
+static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> /* = self::B|::T% */
   ;
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%> /* = self::B|_#new#tearOff::T% */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
+static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> /* = self::B|methodB::T% */ #this) → self::B|methodB::T%
   ;
-static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
+static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> /* = self::B|get#methodB::T% */ #this) → () → self::B|get#methodB::T%
   return () → self::B|get#methodB::T% => self::B|methodB<self::B|get#methodB::T%>(#this);
-static inline-class-member method C1|(dynamic it) → self::C1
+static inline-class-member method C1|(dynamic it) → self::C1 /* = core::int */
   ;
-static inline-class-member method C1|_#new#tearOff(dynamic it) → self::C1
+static inline-class-member method C1|_#new#tearOff(dynamic it) → self::C1 /* = core::int */
   return self::C1|(it);
-static inline-class-member method C1|methodC1(lowered final self::C1 #this) → core::int
+static inline-class-member method C1|methodC1(lowered final self::C1 /* = core::int */ #this) → core::int
   ;
-static inline-class-member method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
+static inline-class-member method C1|get#methodC1(lowered final self::C1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C1|methodC1(#this);
-static inline-class-member method C2|(dynamic it) → self::C2
+static inline-class-member method C2|(dynamic it) → self::C2 /* = core::int */
   ;
-static inline-class-member method C2|_#new#tearOff(dynamic it) → self::C2
+static inline-class-member method C2|_#new#tearOff(dynamic it) → self::C2 /* = core::int */
   return self::C2|(it);
-static inline-class-member method C2|methodC2(lowered final self::C2 #this) → core::int
+static inline-class-member method C2|methodC2(lowered final self::C2 /* = core::int */ #this) → core::int
   ;
-static inline-class-member method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
+static inline-class-member method C2|get#methodC2(lowered final self::C2 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C2|methodC2(#this);
-static inline-class-member method D1|(dynamic it) → self::D1
+static inline-class-member method D1|(dynamic it) → self::D1 /* = core::int */
   ;
-static inline-class-member method D1|_#new#tearOff(dynamic it) → self::D1
+static inline-class-member method D1|_#new#tearOff(dynamic it) → self::D1 /* = core::int */
   return self::D1|(it);
-static inline-class-member method D1|methodD1(lowered final self::D1 #this) → core::int
+static inline-class-member method D1|methodD1(lowered final self::D1 /* = core::int */ #this) → core::int
   ;
-static inline-class-member method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
+static inline-class-member method D1|get#methodD1(lowered final self::D1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::D1|methodD1(#this);
-static method errors(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic
+static method errors(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic
   ;
-static method method(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic
+static method method(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/implements.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/implements.dart.weak.transformed.expect
index 2a378e19eab..570ebd2fb4a 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/implements.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/implements.dart.weak.transformed.expect
@@ -212,75 +212,75 @@ extension type B<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::B|;
   tearoff • = self::B|_#new#tearOff;
 }
-extension type C1(core::int it) implements self::A {
+extension type C1(core::int it) implements self::A /* = core::int */ {
   method methodC1 = self::C1|methodC1;
   tearoff methodC1 = self::C1|get#methodC1;
   constructor • = self::C1|;
   tearoff • = self::C1|_#new#tearOff;
 }
-extension type C2(core::int it) implements self::A, self::B<core::int> {
+extension type C2(core::int it) implements self::A /* = core::int */, self::B<core::int> /* = core::int */ {
   method methodC2 = self::C2|methodC2;
   tearoff methodC2 = self::C2|get#methodC2;
   constructor • = self::C2|;
   tearoff • = self::C2|_#new#tearOff;
 }
-extension type D1(core::int it) implements self::C1 {
+extension type D1(core::int it) implements self::C1 /* = core::int */ {
   method methodD1 = self::D1|methodD1;
   tearoff methodD1 = self::D1|get#methodD1;
   constructor • = self::D1|;
   tearoff • = self::D1|_#new#tearOff;
 }
-static inline-class-member method A|(dynamic it) → self::A {
-  lowered final self::A #this = it;
+static inline-class-member method A|(dynamic it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(dynamic it) → self::A
+static inline-class-member method A|_#new#tearOff(dynamic it) → self::A /* = core::int */
   return self::A|(it);
-static inline-class-member method A|methodA(lowered final self::A #this) → core::int
+static inline-class-member method A|methodA(lowered final self::A /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(5){(core::num) → core::int};
-static inline-class-member method A|get#methodA(lowered final self::A #this) → () → core::int
+static inline-class-member method A|get#methodA(lowered final self::A /* = core::int */ #this) → () → core::int
   return () → core::int => self::A|methodA(#this);
-static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> /* = self::B|::T% */ {
+  lowered final self::B<self::B|::T%> /* = self::B|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%> /* = self::B|_#new#tearOff::T% */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
+static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> /* = self::B|methodB::T% */ #this) → self::B|methodB::T%
   return #this as{Unchecked} self::B|methodB::T%;
-static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
+static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> /* = self::B|get#methodB::T% */ #this) → () → self::B|get#methodB::T%
   return () → self::B|get#methodB::T% => self::B|methodB<self::B|get#methodB::T%>(#this);
-static inline-class-member method C1|(dynamic it) → self::C1 {
-  lowered final self::C1 #this = it;
+static inline-class-member method C1|(dynamic it) → self::C1 /* = core::int */ {
+  lowered final self::C1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C1|_#new#tearOff(dynamic it) → self::C1
+static inline-class-member method C1|_#new#tearOff(dynamic it) → self::C1 /* = core::int */
   return self::C1|(it);
-static inline-class-member method C1|methodC1(lowered final self::C1 #this) → core::int
+static inline-class-member method C1|methodC1(lowered final self::C1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(42){(core::num) → core::int};
-static inline-class-member method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
+static inline-class-member method C1|get#methodC1(lowered final self::C1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C1|methodC1(#this);
-static inline-class-member method C2|(dynamic it) → self::C2 {
-  lowered final self::C2 #this = it;
+static inline-class-member method C2|(dynamic it) → self::C2 /* = core::int */ {
+  lowered final self::C2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C2|_#new#tearOff(dynamic it) → self::C2
+static inline-class-member method C2|_#new#tearOff(dynamic it) → self::C2 /* = core::int */
   return self::C2|(it);
-static inline-class-member method C2|methodC2(lowered final self::C2 #this) → core::int
+static inline-class-member method C2|methodC2(lowered final self::C2 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(87){(core::num) → core::int};
-static inline-class-member method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
+static inline-class-member method C2|get#methodC2(lowered final self::C2 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C2|methodC2(#this);
-static inline-class-member method D1|(dynamic it) → self::D1 {
-  lowered final self::D1 #this = it;
+static inline-class-member method D1|(dynamic it) → self::D1 /* = core::int */ {
+  lowered final self::D1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D1|_#new#tearOff(dynamic it) → self::D1
+static inline-class-member method D1|_#new#tearOff(dynamic it) → self::D1 /* = core::int */
   return self::D1|(it);
-static inline-class-member method D1|methodD1(lowered final self::D1 #this) → core::int
+static inline-class-member method D1|methodD1(lowered final self::D1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(123){(core::num) → core::int};
-static inline-class-member method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
+static inline-class-member method D1|get#methodD1(lowered final self::D1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::D1|methodD1(#this);
-static method errors(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method errors(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:26:5: Error: The method 'methodB' isn't defined for the class 'A'.
 Try correcting the name to the name of an existing method, or defining a method named 'methodB'.
   a.methodB(); // Error
@@ -359,81 +359,81 @@ Try correcting the name to the name of an existing method, or defining a method
      ^^^^^^^^" in d1{<unresolved>}.methodC2();
   a = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:51:7: Error: A value of type 'B<String>' can't be assigned to a variable of type 'A'.
   a = b1; // Error
-      ^" in b1 as{TypeError} self::A;
+      ^" in b1 as{TypeError} self::A /* = core::int */;
   a = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:52:7: Error: A value of type 'B<num>' can't be assigned to a variable of type 'A'.
   a = b2; // Error
-      ^" in b2 as{TypeError} self::A;
+      ^" in b2 as{TypeError} self::A /* = core::int */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:54:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<String>'.
   b1 = a; // Error
-       ^" in a as{TypeError} self::B<core::String>;
+       ^" in a as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:55:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'B<String>'.
   b1 = b2; // Error
-       ^" in b2 as{TypeError} self::B<core::String>;
+       ^" in b2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:56:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<String>'.
   b1 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::String>;
+       ^" in c1 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:57:8: Error: A value of type 'C2' can't be assigned to a variable of type 'B<String>'.
   b1 = c2; // Error
-       ^" in c2 as{TypeError} self::B<core::String>;
+       ^" in c2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:58:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<String>'.
   b1 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::String>;
+       ^" in d1 as{TypeError} self::B<core::String> /* = core::String */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:60:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<num>'.
   b2 = a; // Error
-       ^" in a as{TypeError} self::B<core::num>;
+       ^" in a as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:61:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'B<num>'.
   b2 = b1; // Error
-       ^" in b1 as{TypeError} self::B<core::num>;
+       ^" in b1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:62:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<num>'.
   b2 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::num>;
+       ^" in c1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:63:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<num>'.
   b2 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::num>;
+       ^" in d1 as{TypeError} self::B<core::num> /* = core::num */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:65:8: Error: A value of type 'A' can't be assigned to a variable of type 'C1'.
   c1 = a; // Error
-       ^" in a as{TypeError} self::C1;
+       ^" in a as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:66:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C1'.
   c1 = b1; // Error
-       ^" in b1 as{TypeError} self::C1;
+       ^" in b1 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:67:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C1'.
   c1 = b2; // Error
-       ^" in b2 as{TypeError} self::C1;
+       ^" in b2 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:68:8: Error: A value of type 'C2' can't be assigned to a variable of type 'C1'.
   c1 = c2; // Error
-       ^" in c2 as{TypeError} self::C1;
+       ^" in c2 as{TypeError} self::C1 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:70:8: Error: A value of type 'A' can't be assigned to a variable of type 'C2'.
   c2 = a; // Error
-       ^" in a as{TypeError} self::C2;
+       ^" in a as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:71:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C2'.
   c2 = b1; // Error
-       ^" in b1 as{TypeError} self::C2;
+       ^" in b1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:72:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C2'.
   c2 = b2; // Error
-       ^" in b2 as{TypeError} self::C2;
+       ^" in b2 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:73:8: Error: A value of type 'C1' can't be assigned to a variable of type 'C2'.
   c2 = c1; // Error
-       ^" in c1 as{TypeError} self::C2;
+       ^" in c1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:74:8: Error: A value of type 'D1' can't be assigned to a variable of type 'C2'.
   c2 = d1; // Error
-       ^" in d1 as{TypeError} self::C2;
+       ^" in d1 as{TypeError} self::C2 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:76:8: Error: A value of type 'A' can't be assigned to a variable of type 'D1'.
   d1 = a; // Error
-       ^" in a as{TypeError} self::D1;
+       ^" in a as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:77:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'D1'.
   d1 = b1; // Error
-       ^" in b1 as{TypeError} self::D1;
+       ^" in b1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:78:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'D1'.
   d1 = b2; // Error
-       ^" in b2 as{TypeError} self::D1;
+       ^" in b2 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:79:8: Error: A value of type 'C1' can't be assigned to a variable of type 'D1'.
   d1 = c1; // Error
-       ^" in c1 as{TypeError} self::D1;
+       ^" in c1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/implements.dart:80:8: Error: A value of type 'C2' can't be assigned to a variable of type 'D1'.
   d1 = c2; // Error
-       ^" in c2 as{TypeError} self::D1;
+       ^" in c2 as{TypeError} self::D1 /* = core::int */;
 }
-static method method(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method method(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   self::expect(0.{core::num::+}(5){(core::num) → core::int}, self::A|methodA(a));
   self::expect("0", self::B|methodB<core::String>(b1));
   self::expect(1.{core::num::+}(0){(core::num) → core::int}, self::B|methodB<core::num>(b2));
diff --git a/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.strong.expect
index 36a3f4b96f5..16f348048be 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.strong.expect
@@ -51,78 +51,78 @@ extension type Class6(core::int field) {
   constructor • = self::Class6|;
   tearoff • = self::Class6|_#new#tearOff;
 }
-static inline-class-member method Class1|_(dynamic field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|_(dynamic field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#_#tearOff(dynamic field) → self::Class1
+static inline-class-member method Class1|_#_#tearOff(dynamic field) → self::Class1 /* = core::int */
   return self::Class1|_(field);
-static inline-class-member method Class1|(core::int field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(core::int field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|_(dynamic field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|_(dynamic field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#_#tearOff(dynamic field) → self::Class2
+static inline-class-member method Class2|_#_#tearOff(dynamic field) → self::Class2 /* = core::int */
   return self::Class2|_(field);
-static inline-class-member method Class2|(core::int field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(core::int field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2 /* = core::int */
   return self::Class2|(field);
-static inline-class-member method Class3|_(dynamic field) → self::Class3 {
-  lowered final self::Class3 #this = field;
+static inline-class-member method Class3|_(dynamic field) → self::Class3 /* = core::int */ {
+  lowered final self::Class3 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class3|_#_#tearOff(dynamic field) → self::Class3
+static inline-class-member method Class3|_#_#tearOff(dynamic field) → self::Class3 /* = core::int */
   return self::Class3|_(field);
-static inline-class-member method Class4|_(dynamic field) → self::Class4 {
-  lowered final self::Class4 #this = field;
+static inline-class-member method Class4|_(dynamic field) → self::Class4 /* = core::int */ {
+  lowered final self::Class4 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class4|_#_#tearOff(dynamic field) → self::Class4
+static inline-class-member method Class4|_#_#tearOff(dynamic field) → self::Class4 /* = core::int */
   return self::Class4|_(field);
-static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
-  lowered final self::Class4 #this = field;
+static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */ {
+  lowered final self::Class4 /* = core::int */ #this = field;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/initializers.dart:16:27: Error: 'nonexisting' isn't an instance field of this class.
   Class4(this.field, this.nonexisting); // Error
                           ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */
   return self::Class4|(field, nonexisting);
-static inline-class-member method Class5|_(dynamic field) → self::Class5 {
-  lowered final self::Class5 #this = field;
+static inline-class-member method Class5|_(dynamic field) → self::Class5 /* = core::int */ {
+  lowered final self::Class5 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class5|_#_#tearOff(dynamic field) → self::Class5
+static inline-class-member method Class5|_#_#tearOff(dynamic field) → self::Class5 /* = core::int */
   return self::Class5|_(field);
-static inline-class-member method Class5|(core::int field) → self::Class5 {
-  lowered final self::Class5 #this = field;
+static inline-class-member method Class5|(core::int field) → self::Class5 /* = core::int */ {
+  lowered final self::Class5 /* = core::int */ #this = field;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/initializers.dart:20:35: Error: 'field' was already initialized by this constructor.
   Class5(this.field) : this.field = 42; // Error
                                   ^";
   return #this;
 }
-static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5
+static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5 /* = core::int */
   return self::Class5|(field);
-static inline-class-member method Class6|_(dynamic field) → self::Class6 {
-  lowered final self::Class6 #this = field;
+static inline-class-member method Class6|_(dynamic field) → self::Class6 /* = core::int */ {
+  lowered final self::Class6 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class6|_#_#tearOff(dynamic field) → self::Class6
+static inline-class-member method Class6|_#_#tearOff(dynamic field) → self::Class6 /* = core::int */
   return self::Class6|_(field);
-static inline-class-member method Class6|(core::int field) → self::Class6 {
-  lowered final self::Class6 #this = field;
+static inline-class-member method Class6|(core::int field) → self::Class6 /* = core::int */ {
+  lowered final self::Class6 /* = core::int */ #this = field;
   final dynamic #t3 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/initializers.dart:24:29: Error: 'nonexisting' isn't an instance field of this class.
   Class6(this.field) : this.nonexisting = 42; // Error
                             ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6
+static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6 /* = core::int */
   return self::Class6|(field);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.strong.transformed.expect
index 36a3f4b96f5..16f348048be 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.strong.transformed.expect
@@ -51,78 +51,78 @@ extension type Class6(core::int field) {
   constructor • = self::Class6|;
   tearoff • = self::Class6|_#new#tearOff;
 }
-static inline-class-member method Class1|_(dynamic field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|_(dynamic field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#_#tearOff(dynamic field) → self::Class1
+static inline-class-member method Class1|_#_#tearOff(dynamic field) → self::Class1 /* = core::int */
   return self::Class1|_(field);
-static inline-class-member method Class1|(core::int field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(core::int field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|_(dynamic field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|_(dynamic field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#_#tearOff(dynamic field) → self::Class2
+static inline-class-member method Class2|_#_#tearOff(dynamic field) → self::Class2 /* = core::int */
   return self::Class2|_(field);
-static inline-class-member method Class2|(core::int field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(core::int field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2 /* = core::int */
   return self::Class2|(field);
-static inline-class-member method Class3|_(dynamic field) → self::Class3 {
-  lowered final self::Class3 #this = field;
+static inline-class-member method Class3|_(dynamic field) → self::Class3 /* = core::int */ {
+  lowered final self::Class3 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class3|_#_#tearOff(dynamic field) → self::Class3
+static inline-class-member method Class3|_#_#tearOff(dynamic field) → self::Class3 /* = core::int */
   return self::Class3|_(field);
-static inline-class-member method Class4|_(dynamic field) → self::Class4 {
-  lowered final self::Class4 #this = field;
+static inline-class-member method Class4|_(dynamic field) → self::Class4 /* = core::int */ {
+  lowered final self::Class4 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class4|_#_#tearOff(dynamic field) → self::Class4
+static inline-class-member method Class4|_#_#tearOff(dynamic field) → self::Class4 /* = core::int */
   return self::Class4|_(field);
-static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
-  lowered final self::Class4 #this = field;
+static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */ {
+  lowered final self::Class4 /* = core::int */ #this = field;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/initializers.dart:16:27: Error: 'nonexisting' isn't an instance field of this class.
   Class4(this.field, this.nonexisting); // Error
                           ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */
   return self::Class4|(field, nonexisting);
-static inline-class-member method Class5|_(dynamic field) → self::Class5 {
-  lowered final self::Class5 #this = field;
+static inline-class-member method Class5|_(dynamic field) → self::Class5 /* = core::int */ {
+  lowered final self::Class5 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class5|_#_#tearOff(dynamic field) → self::Class5
+static inline-class-member method Class5|_#_#tearOff(dynamic field) → self::Class5 /* = core::int */
   return self::Class5|_(field);
-static inline-class-member method Class5|(core::int field) → self::Class5 {
-  lowered final self::Class5 #this = field;
+static inline-class-member method Class5|(core::int field) → self::Class5 /* = core::int */ {
+  lowered final self::Class5 /* = core::int */ #this = field;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/initializers.dart:20:35: Error: 'field' was already initialized by this constructor.
   Class5(this.field) : this.field = 42; // Error
                                   ^";
   return #this;
 }
-static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5
+static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5 /* = core::int */
   return self::Class5|(field);
-static inline-class-member method Class6|_(dynamic field) → self::Class6 {
-  lowered final self::Class6 #this = field;
+static inline-class-member method Class6|_(dynamic field) → self::Class6 /* = core::int */ {
+  lowered final self::Class6 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class6|_#_#tearOff(dynamic field) → self::Class6
+static inline-class-member method Class6|_#_#tearOff(dynamic field) → self::Class6 /* = core::int */
   return self::Class6|_(field);
-static inline-class-member method Class6|(core::int field) → self::Class6 {
-  lowered final self::Class6 #this = field;
+static inline-class-member method Class6|(core::int field) → self::Class6 /* = core::int */ {
+  lowered final self::Class6 /* = core::int */ #this = field;
   final dynamic #t3 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/initializers.dart:24:29: Error: 'nonexisting' isn't an instance field of this class.
   Class6(this.field) : this.nonexisting = 42; // Error
                             ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6
+static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6 /* = core::int */
   return self::Class6|(field);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.weak.expect
index 36a3f4b96f5..16f348048be 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.weak.expect
@@ -51,78 +51,78 @@ extension type Class6(core::int field) {
   constructor • = self::Class6|;
   tearoff • = self::Class6|_#new#tearOff;
 }
-static inline-class-member method Class1|_(dynamic field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|_(dynamic field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#_#tearOff(dynamic field) → self::Class1
+static inline-class-member method Class1|_#_#tearOff(dynamic field) → self::Class1 /* = core::int */
   return self::Class1|_(field);
-static inline-class-member method Class1|(core::int field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(core::int field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|_(dynamic field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|_(dynamic field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#_#tearOff(dynamic field) → self::Class2
+static inline-class-member method Class2|_#_#tearOff(dynamic field) → self::Class2 /* = core::int */
   return self::Class2|_(field);
-static inline-class-member method Class2|(core::int field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(core::int field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2 /* = core::int */
   return self::Class2|(field);
-static inline-class-member method Class3|_(dynamic field) → self::Class3 {
-  lowered final self::Class3 #this = field;
+static inline-class-member method Class3|_(dynamic field) → self::Class3 /* = core::int */ {
+  lowered final self::Class3 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class3|_#_#tearOff(dynamic field) → self::Class3
+static inline-class-member method Class3|_#_#tearOff(dynamic field) → self::Class3 /* = core::int */
   return self::Class3|_(field);
-static inline-class-member method Class4|_(dynamic field) → self::Class4 {
-  lowered final self::Class4 #this = field;
+static inline-class-member method Class4|_(dynamic field) → self::Class4 /* = core::int */ {
+  lowered final self::Class4 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class4|_#_#tearOff(dynamic field) → self::Class4
+static inline-class-member method Class4|_#_#tearOff(dynamic field) → self::Class4 /* = core::int */
   return self::Class4|_(field);
-static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
-  lowered final self::Class4 #this = field;
+static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */ {
+  lowered final self::Class4 /* = core::int */ #this = field;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/initializers.dart:16:27: Error: 'nonexisting' isn't an instance field of this class.
   Class4(this.field, this.nonexisting); // Error
                           ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */
   return self::Class4|(field, nonexisting);
-static inline-class-member method Class5|_(dynamic field) → self::Class5 {
-  lowered final self::Class5 #this = field;
+static inline-class-member method Class5|_(dynamic field) → self::Class5 /* = core::int */ {
+  lowered final self::Class5 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class5|_#_#tearOff(dynamic field) → self::Class5
+static inline-class-member method Class5|_#_#tearOff(dynamic field) → self::Class5 /* = core::int */
   return self::Class5|_(field);
-static inline-class-member method Class5|(core::int field) → self::Class5 {
-  lowered final self::Class5 #this = field;
+static inline-class-member method Class5|(core::int field) → self::Class5 /* = core::int */ {
+  lowered final self::Class5 /* = core::int */ #this = field;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/initializers.dart:20:35: Error: 'field' was already initialized by this constructor.
   Class5(this.field) : this.field = 42; // Error
                                   ^";
   return #this;
 }
-static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5
+static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5 /* = core::int */
   return self::Class5|(field);
-static inline-class-member method Class6|_(dynamic field) → self::Class6 {
-  lowered final self::Class6 #this = field;
+static inline-class-member method Class6|_(dynamic field) → self::Class6 /* = core::int */ {
+  lowered final self::Class6 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class6|_#_#tearOff(dynamic field) → self::Class6
+static inline-class-member method Class6|_#_#tearOff(dynamic field) → self::Class6 /* = core::int */
   return self::Class6|_(field);
-static inline-class-member method Class6|(core::int field) → self::Class6 {
-  lowered final self::Class6 #this = field;
+static inline-class-member method Class6|(core::int field) → self::Class6 /* = core::int */ {
+  lowered final self::Class6 /* = core::int */ #this = field;
   final dynamic #t3 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/initializers.dart:24:29: Error: 'nonexisting' isn't an instance field of this class.
   Class6(this.field) : this.nonexisting = 42; // Error
                             ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6
+static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6 /* = core::int */
   return self::Class6|(field);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.weak.modular.expect
index 36a3f4b96f5..16f348048be 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.weak.modular.expect
@@ -51,78 +51,78 @@ extension type Class6(core::int field) {
   constructor • = self::Class6|;
   tearoff • = self::Class6|_#new#tearOff;
 }
-static inline-class-member method Class1|_(dynamic field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|_(dynamic field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#_#tearOff(dynamic field) → self::Class1
+static inline-class-member method Class1|_#_#tearOff(dynamic field) → self::Class1 /* = core::int */
   return self::Class1|_(field);
-static inline-class-member method Class1|(core::int field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(core::int field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|_(dynamic field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|_(dynamic field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#_#tearOff(dynamic field) → self::Class2
+static inline-class-member method Class2|_#_#tearOff(dynamic field) → self::Class2 /* = core::int */
   return self::Class2|_(field);
-static inline-class-member method Class2|(core::int field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(core::int field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2 /* = core::int */
   return self::Class2|(field);
-static inline-class-member method Class3|_(dynamic field) → self::Class3 {
-  lowered final self::Class3 #this = field;
+static inline-class-member method Class3|_(dynamic field) → self::Class3 /* = core::int */ {
+  lowered final self::Class3 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class3|_#_#tearOff(dynamic field) → self::Class3
+static inline-class-member method Class3|_#_#tearOff(dynamic field) → self::Class3 /* = core::int */
   return self::Class3|_(field);
-static inline-class-member method Class4|_(dynamic field) → self::Class4 {
-  lowered final self::Class4 #this = field;
+static inline-class-member method Class4|_(dynamic field) → self::Class4 /* = core::int */ {
+  lowered final self::Class4 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class4|_#_#tearOff(dynamic field) → self::Class4
+static inline-class-member method Class4|_#_#tearOff(dynamic field) → self::Class4 /* = core::int */
   return self::Class4|_(field);
-static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
-  lowered final self::Class4 #this = field;
+static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */ {
+  lowered final self::Class4 /* = core::int */ #this = field;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/initializers.dart:16:27: Error: 'nonexisting' isn't an instance field of this class.
   Class4(this.field, this.nonexisting); // Error
                           ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */
   return self::Class4|(field, nonexisting);
-static inline-class-member method Class5|_(dynamic field) → self::Class5 {
-  lowered final self::Class5 #this = field;
+static inline-class-member method Class5|_(dynamic field) → self::Class5 /* = core::int */ {
+  lowered final self::Class5 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class5|_#_#tearOff(dynamic field) → self::Class5
+static inline-class-member method Class5|_#_#tearOff(dynamic field) → self::Class5 /* = core::int */
   return self::Class5|_(field);
-static inline-class-member method Class5|(core::int field) → self::Class5 {
-  lowered final self::Class5 #this = field;
+static inline-class-member method Class5|(core::int field) → self::Class5 /* = core::int */ {
+  lowered final self::Class5 /* = core::int */ #this = field;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/initializers.dart:20:35: Error: 'field' was already initialized by this constructor.
   Class5(this.field) : this.field = 42; // Error
                                   ^";
   return #this;
 }
-static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5
+static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5 /* = core::int */
   return self::Class5|(field);
-static inline-class-member method Class6|_(dynamic field) → self::Class6 {
-  lowered final self::Class6 #this = field;
+static inline-class-member method Class6|_(dynamic field) → self::Class6 /* = core::int */ {
+  lowered final self::Class6 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class6|_#_#tearOff(dynamic field) → self::Class6
+static inline-class-member method Class6|_#_#tearOff(dynamic field) → self::Class6 /* = core::int */
   return self::Class6|_(field);
-static inline-class-member method Class6|(core::int field) → self::Class6 {
-  lowered final self::Class6 #this = field;
+static inline-class-member method Class6|(core::int field) → self::Class6 /* = core::int */ {
+  lowered final self::Class6 /* = core::int */ #this = field;
   final dynamic #t3 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/initializers.dart:24:29: Error: 'nonexisting' isn't an instance field of this class.
   Class6(this.field) : this.nonexisting = 42; // Error
                             ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6
+static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6 /* = core::int */
   return self::Class6|(field);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.weak.outline.expect
index 9e31be93d9a..54f9abb4d71 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.weak.outline.expect
@@ -36,47 +36,47 @@ extension type Class6(core::int field) {
   constructor • = self::Class6|;
   tearoff • = self::Class6|_#new#tearOff;
 }
-static inline-class-member method Class1|_(dynamic field) → self::Class1
+static inline-class-member method Class1|_(dynamic field) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#_#tearOff(dynamic field) → self::Class1
+static inline-class-member method Class1|_#_#tearOff(dynamic field) → self::Class1 /* = core::int */
   return self::Class1|_(field);
-static inline-class-member method Class1|(core::int field) → self::Class1
+static inline-class-member method Class1|(core::int field) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|_(dynamic field) → self::Class2
+static inline-class-member method Class2|_(dynamic field) → self::Class2 /* = core::int */
   ;
-static inline-class-member method Class2|_#_#tearOff(dynamic field) → self::Class2
+static inline-class-member method Class2|_#_#tearOff(dynamic field) → self::Class2 /* = core::int */
   return self::Class2|_(field);
-static inline-class-member method Class2|(core::int field) → self::Class2
+static inline-class-member method Class2|(core::int field) → self::Class2 /* = core::int */
   ;
-static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2 /* = core::int */
   return self::Class2|(field);
-static inline-class-member method Class3|_(dynamic field) → self::Class3
+static inline-class-member method Class3|_(dynamic field) → self::Class3 /* = core::int */
   ;
-static inline-class-member method Class3|_#_#tearOff(dynamic field) → self::Class3
+static inline-class-member method Class3|_#_#tearOff(dynamic field) → self::Class3 /* = core::int */
   return self::Class3|_(field);
-static inline-class-member method Class4|_(dynamic field) → self::Class4
+static inline-class-member method Class4|_(dynamic field) → self::Class4 /* = core::int */
   ;
-static inline-class-member method Class4|_#_#tearOff(dynamic field) → self::Class4
+static inline-class-member method Class4|_#_#tearOff(dynamic field) → self::Class4 /* = core::int */
   return self::Class4|_(field);
-static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */
   ;
-static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */
   return self::Class4|(field, nonexisting);
-static inline-class-member method Class5|_(dynamic field) → self::Class5
+static inline-class-member method Class5|_(dynamic field) → self::Class5 /* = core::int */
   ;
-static inline-class-member method Class5|_#_#tearOff(dynamic field) → self::Class5
+static inline-class-member method Class5|_#_#tearOff(dynamic field) → self::Class5 /* = core::int */
   return self::Class5|_(field);
-static inline-class-member method Class5|(core::int field) → self::Class5
+static inline-class-member method Class5|(core::int field) → self::Class5 /* = core::int */
   ;
-static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5
+static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5 /* = core::int */
   return self::Class5|(field);
-static inline-class-member method Class6|_(dynamic field) → self::Class6
+static inline-class-member method Class6|_(dynamic field) → self::Class6 /* = core::int */
   ;
-static inline-class-member method Class6|_#_#tearOff(dynamic field) → self::Class6
+static inline-class-member method Class6|_#_#tearOff(dynamic field) → self::Class6 /* = core::int */
   return self::Class6|_(field);
-static inline-class-member method Class6|(core::int field) → self::Class6
+static inline-class-member method Class6|(core::int field) → self::Class6 /* = core::int */
   ;
-static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6
+static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6 /* = core::int */
   return self::Class6|(field);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.weak.transformed.expect
index 36a3f4b96f5..16f348048be 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/initializers.dart.weak.transformed.expect
@@ -51,78 +51,78 @@ extension type Class6(core::int field) {
   constructor • = self::Class6|;
   tearoff • = self::Class6|_#new#tearOff;
 }
-static inline-class-member method Class1|_(dynamic field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|_(dynamic field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#_#tearOff(dynamic field) → self::Class1
+static inline-class-member method Class1|_#_#tearOff(dynamic field) → self::Class1 /* = core::int */
   return self::Class1|_(field);
-static inline-class-member method Class1|(core::int field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(core::int field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|_(dynamic field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|_(dynamic field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#_#tearOff(dynamic field) → self::Class2
+static inline-class-member method Class2|_#_#tearOff(dynamic field) → self::Class2 /* = core::int */
   return self::Class2|_(field);
-static inline-class-member method Class2|(core::int field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(core::int field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2 /* = core::int */
   return self::Class2|(field);
-static inline-class-member method Class3|_(dynamic field) → self::Class3 {
-  lowered final self::Class3 #this = field;
+static inline-class-member method Class3|_(dynamic field) → self::Class3 /* = core::int */ {
+  lowered final self::Class3 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class3|_#_#tearOff(dynamic field) → self::Class3
+static inline-class-member method Class3|_#_#tearOff(dynamic field) → self::Class3 /* = core::int */
   return self::Class3|_(field);
-static inline-class-member method Class4|_(dynamic field) → self::Class4 {
-  lowered final self::Class4 #this = field;
+static inline-class-member method Class4|_(dynamic field) → self::Class4 /* = core::int */ {
+  lowered final self::Class4 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class4|_#_#tearOff(dynamic field) → self::Class4
+static inline-class-member method Class4|_#_#tearOff(dynamic field) → self::Class4 /* = core::int */
   return self::Class4|_(field);
-static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
-  lowered final self::Class4 #this = field;
+static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */ {
+  lowered final self::Class4 /* = core::int */ #this = field;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/initializers.dart:16:27: Error: 'nonexisting' isn't an instance field of this class.
   Class4(this.field, this.nonexisting); // Error
                           ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */
   return self::Class4|(field, nonexisting);
-static inline-class-member method Class5|_(dynamic field) → self::Class5 {
-  lowered final self::Class5 #this = field;
+static inline-class-member method Class5|_(dynamic field) → self::Class5 /* = core::int */ {
+  lowered final self::Class5 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class5|_#_#tearOff(dynamic field) → self::Class5
+static inline-class-member method Class5|_#_#tearOff(dynamic field) → self::Class5 /* = core::int */
   return self::Class5|_(field);
-static inline-class-member method Class5|(core::int field) → self::Class5 {
-  lowered final self::Class5 #this = field;
+static inline-class-member method Class5|(core::int field) → self::Class5 /* = core::int */ {
+  lowered final self::Class5 /* = core::int */ #this = field;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/initializers.dart:20:35: Error: 'field' was already initialized by this constructor.
   Class5(this.field) : this.field = 42; // Error
                                   ^";
   return #this;
 }
-static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5
+static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5 /* = core::int */
   return self::Class5|(field);
-static inline-class-member method Class6|_(dynamic field) → self::Class6 {
-  lowered final self::Class6 #this = field;
+static inline-class-member method Class6|_(dynamic field) → self::Class6 /* = core::int */ {
+  lowered final self::Class6 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class6|_#_#tearOff(dynamic field) → self::Class6
+static inline-class-member method Class6|_#_#tearOff(dynamic field) → self::Class6 /* = core::int */
   return self::Class6|_(field);
-static inline-class-member method Class6|(core::int field) → self::Class6 {
-  lowered final self::Class6 #this = field;
+static inline-class-member method Class6|(core::int field) → self::Class6 /* = core::int */ {
+  lowered final self::Class6 /* = core::int */ #this = field;
   final dynamic #t3 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/initializers.dart:24:29: Error: 'nonexisting' isn't an instance field of this class.
   Class6(this.field) : this.nonexisting = 42; // Error
                             ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6
+static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6 /* = core::int */
   return self::Class6|(field);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.strong.expect
index 5ab42480678..75c1dce4641 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.strong.expect
@@ -12,16 +12,16 @@ extension type Class3<T extends core::Object? = dynamic>(core::List<T%> it) {
   constructor • = self::Class3|;
   tearoff • = self::Class3|_#new#tearOff;
 }
-static inline-class-member method Class1|(dynamic it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(dynamic it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class3|<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|::T%> {
-  lowered final self::Class3<self::Class3|::T%> #this = it;
+static inline-class-member method Class3|<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ {
+  lowered final self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|_#new#tearOff::T%>
+static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|_#new#tearOff::T%> /* = core::List<self::Class3|_#new#tearOff::T%> */
   return self::Class3|<self::Class3|_#new#tearOff::T%>(it);
-static method method(self::Class1 c1, self::Class3<core::int> c3) → dynamic {}
+static method method(self::Class1 /* = core::int */ c1, self::Class3<core::int> /* = core::List<core::int> */ c3) → dynamic {}
diff --git a/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.strong.transformed.expect
index 5ab42480678..75c1dce4641 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.strong.transformed.expect
@@ -12,16 +12,16 @@ extension type Class3<T extends core::Object? = dynamic>(core::List<T%> it) {
   constructor • = self::Class3|;
   tearoff • = self::Class3|_#new#tearOff;
 }
-static inline-class-member method Class1|(dynamic it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(dynamic it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class3|<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|::T%> {
-  lowered final self::Class3<self::Class3|::T%> #this = it;
+static inline-class-member method Class3|<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ {
+  lowered final self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|_#new#tearOff::T%>
+static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|_#new#tearOff::T%> /* = core::List<self::Class3|_#new#tearOff::T%> */
   return self::Class3|<self::Class3|_#new#tearOff::T%>(it);
-static method method(self::Class1 c1, self::Class3<core::int> c3) → dynamic {}
+static method method(self::Class1 /* = core::int */ c1, self::Class3<core::int> /* = core::List<core::int> */ c3) → dynamic {}
diff --git a/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.weak.expect
index 5ab42480678..75c1dce4641 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.weak.expect
@@ -12,16 +12,16 @@ extension type Class3<T extends core::Object? = dynamic>(core::List<T%> it) {
   constructor • = self::Class3|;
   tearoff • = self::Class3|_#new#tearOff;
 }
-static inline-class-member method Class1|(dynamic it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(dynamic it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class3|<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|::T%> {
-  lowered final self::Class3<self::Class3|::T%> #this = it;
+static inline-class-member method Class3|<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ {
+  lowered final self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|_#new#tearOff::T%>
+static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|_#new#tearOff::T%> /* = core::List<self::Class3|_#new#tearOff::T%> */
   return self::Class3|<self::Class3|_#new#tearOff::T%>(it);
-static method method(self::Class1 c1, self::Class3<core::int> c3) → dynamic {}
+static method method(self::Class1 /* = core::int */ c1, self::Class3<core::int> /* = core::List<core::int> */ c3) → dynamic {}
diff --git a/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.weak.modular.expect
index 5ab42480678..75c1dce4641 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.weak.modular.expect
@@ -12,16 +12,16 @@ extension type Class3<T extends core::Object? = dynamic>(core::List<T%> it) {
   constructor • = self::Class3|;
   tearoff • = self::Class3|_#new#tearOff;
 }
-static inline-class-member method Class1|(dynamic it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(dynamic it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class3|<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|::T%> {
-  lowered final self::Class3<self::Class3|::T%> #this = it;
+static inline-class-member method Class3|<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ {
+  lowered final self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|_#new#tearOff::T%>
+static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|_#new#tearOff::T%> /* = core::List<self::Class3|_#new#tearOff::T%> */
   return self::Class3|<self::Class3|_#new#tearOff::T%>(it);
-static method method(self::Class1 c1, self::Class3<core::int> c3) → dynamic {}
+static method method(self::Class1 /* = core::int */ c1, self::Class3<core::int> /* = core::List<core::int> */ c3) → dynamic {}
diff --git a/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.weak.outline.expect
index feaf1fa07ac..d05e60b3a35 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.weak.outline.expect
@@ -12,13 +12,13 @@ extension type Class3<T extends core::Object? = dynamic>(core::List<T%> it) {
   constructor • = self::Class3|;
   tearoff • = self::Class3|_#new#tearOff;
 }
-static inline-class-member method Class1|(dynamic it) → self::Class1
+static inline-class-member method Class1|(dynamic it) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class3|<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|::T%>
+static inline-class-member method Class3|<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */
   ;
-static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|_#new#tearOff::T%>
+static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|_#new#tearOff::T%> /* = core::List<self::Class3|_#new#tearOff::T%> */
   return self::Class3|<self::Class3|_#new#tearOff::T%>(it);
-static method method(self::Class1 c1, self::Class3<core::int> c3) → dynamic
+static method method(self::Class1 /* = core::int */ c1, self::Class3<core::int> /* = core::List<core::int> */ c3) → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.weak.transformed.expect
index 5ab42480678..75c1dce4641 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/inline_class_declaration.dart.weak.transformed.expect
@@ -12,16 +12,16 @@ extension type Class3<T extends core::Object? = dynamic>(core::List<T%> it) {
   constructor • = self::Class3|;
   tearoff • = self::Class3|_#new#tearOff;
 }
-static inline-class-member method Class1|(dynamic it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(dynamic it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(dynamic it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class3|<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|::T%> {
-  lowered final self::Class3<self::Class3|::T%> #this = it;
+static inline-class-member method Class3|<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ {
+  lowered final self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|_#new#tearOff::T%>
+static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Class3<self::Class3|_#new#tearOff::T%> /* = core::List<self::Class3|_#new#tearOff::T%> */
   return self::Class3|<self::Class3|_#new#tearOff::T%>(it);
-static method method(self::Class1 c1, self::Class3<core::int> c3) → dynamic {}
+static method method(self::Class1 /* = core::int */ c1, self::Class3<core::int> /* = core::List<core::int> */ c3) → dynamic {}
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.strong.expect
index ba018a10b51..f6aefff828e 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.strong.expect
@@ -6,13 +6,13 @@ extension type I<X extends core::Object? = dynamic, Y extends core::Object? = dy
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|::X%, self::I|::Y%> {
-  lowered final self::I<self::I|::X%, self::I|::Y%> #this = value;
+static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ {
+  lowered final self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ #this = value;
   return #this;
 }
-static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
+static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%> /* = self::I|_#new#tearOff::X% */
   return self::I|<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>(value);
-static method f(self::I<core::int, core::String> i) → void {}
+static method f(self::I<core::int, core::String> /* = core::int */ i) → void {}
 static method main() → void {
   self::f(self::I|<core::int, core::String>(2));
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.strong.transformed.expect
index ba018a10b51..f6aefff828e 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.strong.transformed.expect
@@ -6,13 +6,13 @@ extension type I<X extends core::Object? = dynamic, Y extends core::Object? = dy
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|::X%, self::I|::Y%> {
-  lowered final self::I<self::I|::X%, self::I|::Y%> #this = value;
+static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ {
+  lowered final self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ #this = value;
   return #this;
 }
-static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
+static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%> /* = self::I|_#new#tearOff::X% */
   return self::I|<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>(value);
-static method f(self::I<core::int, core::String> i) → void {}
+static method f(self::I<core::int, core::String> /* = core::int */ i) → void {}
 static method main() → void {
   self::f(self::I|<core::int, core::String>(2));
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.weak.expect
index ba018a10b51..f6aefff828e 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.weak.expect
@@ -6,13 +6,13 @@ extension type I<X extends core::Object? = dynamic, Y extends core::Object? = dy
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|::X%, self::I|::Y%> {
-  lowered final self::I<self::I|::X%, self::I|::Y%> #this = value;
+static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ {
+  lowered final self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ #this = value;
   return #this;
 }
-static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
+static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%> /* = self::I|_#new#tearOff::X% */
   return self::I|<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>(value);
-static method f(self::I<core::int, core::String> i) → void {}
+static method f(self::I<core::int, core::String> /* = core::int */ i) → void {}
 static method main() → void {
   self::f(self::I|<core::int, core::String>(2));
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.weak.modular.expect
index ba018a10b51..f6aefff828e 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.weak.modular.expect
@@ -6,13 +6,13 @@ extension type I<X extends core::Object? = dynamic, Y extends core::Object? = dy
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|::X%, self::I|::Y%> {
-  lowered final self::I<self::I|::X%, self::I|::Y%> #this = value;
+static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ {
+  lowered final self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ #this = value;
   return #this;
 }
-static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
+static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%> /* = self::I|_#new#tearOff::X% */
   return self::I|<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>(value);
-static method f(self::I<core::int, core::String> i) → void {}
+static method f(self::I<core::int, core::String> /* = core::int */ i) → void {}
 static method main() → void {
   self::f(self::I|<core::int, core::String>(2));
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.weak.outline.expect
index fbacf794b6e..6c72a28763a 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.weak.outline.expect
@@ -6,11 +6,11 @@ extension type I<X extends core::Object? = dynamic, Y extends core::Object? = dy
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|::X%, self::I|::Y%>
+static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */
   ;
-static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
+static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%> /* = self::I|_#new#tearOff::X% */
   return self::I|<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>(value);
-static method f(self::I<core::int, core::String> i) → void
+static method f(self::I<core::int, core::String> /* = core::int */ i) → void
   ;
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.weak.transformed.expect
index ba018a10b51..f6aefff828e 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51146.dart.weak.transformed.expect
@@ -6,13 +6,13 @@ extension type I<X extends core::Object? = dynamic, Y extends core::Object? = dy
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|::X%, self::I|::Y%> {
-  lowered final self::I<self::I|::X%, self::I|::Y%> #this = value;
+static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ {
+  lowered final self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ #this = value;
   return #this;
 }
-static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
+static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(dynamic value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%> /* = self::I|_#new#tearOff::X% */
   return self::I|<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>(value);
-static method f(self::I<core::int, core::String> i) → void {}
+static method f(self::I<core::int, core::String> /* = core::int */ i) → void {}
 static method main() → void {
   self::f(self::I|<core::int, core::String>(2));
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.strong.expect
index 522c1d67eb9..dce45a1fc19 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.strong.expect
@@ -20,46 +20,46 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   static factory • = self::K|;
   static tearoff • = self::K|_#new#tearOff;
 }
-static inline-class-member method I|_(dynamic i) → self::I {
-  lowered final self::I #this = i;
+static inline-class-member method I|_(dynamic i) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method I|_#_#tearOff(dynamic i) → self::I
+static inline-class-member method I|_#_#tearOff(dynamic i) → self::I /* = core::int */
   return self::I|_(i);
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|_(dynamic i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(dynamic i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(dynamic i) → self::J
+static inline-class-member method J|_#_#tearOff(dynamic i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.strong.transformed.expect
index 522c1d67eb9..dce45a1fc19 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.strong.transformed.expect
@@ -20,46 +20,46 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   static factory • = self::K|;
   static tearoff • = self::K|_#new#tearOff;
 }
-static inline-class-member method I|_(dynamic i) → self::I {
-  lowered final self::I #this = i;
+static inline-class-member method I|_(dynamic i) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method I|_#_#tearOff(dynamic i) → self::I
+static inline-class-member method I|_#_#tearOff(dynamic i) → self::I /* = core::int */
   return self::I|_(i);
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|_(dynamic i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(dynamic i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(dynamic i) → self::J
+static inline-class-member method J|_#_#tearOff(dynamic i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.weak.expect
index 897f6161012..ee18017a9fe 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.weak.expect
@@ -20,46 +20,46 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   static factory • = self::K|;
   static tearoff • = self::K|_#new#tearOff;
 }
-static inline-class-member method I|_(dynamic i) → self::I {
-  lowered final self::I #this = i;
+static inline-class-member method I|_(dynamic i) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method I|_#_#tearOff(dynamic i) → self::I
+static inline-class-member method I|_#_#tearOff(dynamic i) → self::I /* = core::int */
   return self::I|_(i);
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|_(dynamic i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(dynamic i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(dynamic i) → self::J
+static inline-class-member method J|_#_#tearOff(dynamic i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.weak.modular.expect
index 897f6161012..ee18017a9fe 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.weak.modular.expect
@@ -20,46 +20,46 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   static factory • = self::K|;
   static tearoff • = self::K|_#new#tearOff;
 }
-static inline-class-member method I|_(dynamic i) → self::I {
-  lowered final self::I #this = i;
+static inline-class-member method I|_(dynamic i) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method I|_#_#tearOff(dynamic i) → self::I
+static inline-class-member method I|_#_#tearOff(dynamic i) → self::I /* = core::int */
   return self::I|_(i);
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|_(dynamic i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(dynamic i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(dynamic i) → self::J
+static inline-class-member method J|_#_#tearOff(dynamic i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.weak.outline.expect
index 9e551087ab6..f31f0ec6f81 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.weak.outline.expect
@@ -20,29 +20,29 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   static factory • = self::K|;
   static tearoff • = self::K|_#new#tearOff;
 }
-static inline-class-member method I|_(dynamic i) → self::I
+static inline-class-member method I|_(dynamic i) → self::I /* = core::int */
   ;
-static inline-class-member method I|_#_#tearOff(dynamic i) → self::I
+static inline-class-member method I|_#_#tearOff(dynamic i) → self::I /* = core::int */
   return self::I|_(i);
-static inline-class-member method I|() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
   ;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|_(dynamic i) → self::J
+static inline-class-member method J|_(dynamic i) → self::J /* = core::int */
   ;
-static inline-class-member method J|_#_#tearOff(dynamic i) → self::J
+static inline-class-member method J|_#_#tearOff(dynamic i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   ;
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_::T%>
+static inline-class-member method K|_<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_::T%> /* = self::K|_::T% */
   ;
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   ;
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.weak.transformed.expect
index 897f6161012..ee18017a9fe 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51285.dart.weak.transformed.expect
@@ -20,46 +20,46 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   static factory • = self::K|;
   static tearoff • = self::K|_#new#tearOff;
 }
-static inline-class-member method I|_(dynamic i) → self::I {
-  lowered final self::I #this = i;
+static inline-class-member method I|_(dynamic i) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method I|_#_#tearOff(dynamic i) → self::I
+static inline-class-member method I|_#_#tearOff(dynamic i) → self::I /* = core::int */
   return self::I|_(i);
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|_(dynamic i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(dynamic i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(dynamic i) → self::J
+static inline-class-member method J|_#_#tearOff(dynamic i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.strong.expect
index 65dca50dcee..396539a787b 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.strong.expect
@@ -8,12 +8,12 @@ extension type I(core::int _i) {
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static inline-class-member method I|(dynamic _i) → self::I {
-  lowered final self::I #this = _i;
+static inline-class-member method I|(dynamic _i) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = _i;
   return #this;
 }
-static inline-class-member method I|_#new#tearOff(dynamic _i) → self::I
+static inline-class-member method I|_#new#tearOff(dynamic _i) → self::I /* = core::int */
   return self::I|(_i);
-static inline-class-member method I|get#i(lowered final self::I #this) → core::int
+static inline-class-member method I|get#i(lowered final self::I /* = core::int */ #this) → core::int
   return 0;
-static inline-class-member method I|set#i(lowered final self::I #this, core::int val) → void {}
+static inline-class-member method I|set#i(lowered final self::I /* = core::int */ #this, core::int val) → void {}
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.strong.transformed.expect
index 65dca50dcee..396539a787b 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.strong.transformed.expect
@@ -8,12 +8,12 @@ extension type I(core::int _i) {
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static inline-class-member method I|(dynamic _i) → self::I {
-  lowered final self::I #this = _i;
+static inline-class-member method I|(dynamic _i) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = _i;
   return #this;
 }
-static inline-class-member method I|_#new#tearOff(dynamic _i) → self::I
+static inline-class-member method I|_#new#tearOff(dynamic _i) → self::I /* = core::int */
   return self::I|(_i);
-static inline-class-member method I|get#i(lowered final self::I #this) → core::int
+static inline-class-member method I|get#i(lowered final self::I /* = core::int */ #this) → core::int
   return 0;
-static inline-class-member method I|set#i(lowered final self::I #this, core::int val) → void {}
+static inline-class-member method I|set#i(lowered final self::I /* = core::int */ #this, core::int val) → void {}
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.weak.expect
index 65dca50dcee..396539a787b 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.weak.expect
@@ -8,12 +8,12 @@ extension type I(core::int _i) {
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static inline-class-member method I|(dynamic _i) → self::I {
-  lowered final self::I #this = _i;
+static inline-class-member method I|(dynamic _i) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = _i;
   return #this;
 }
-static inline-class-member method I|_#new#tearOff(dynamic _i) → self::I
+static inline-class-member method I|_#new#tearOff(dynamic _i) → self::I /* = core::int */
   return self::I|(_i);
-static inline-class-member method I|get#i(lowered final self::I #this) → core::int
+static inline-class-member method I|get#i(lowered final self::I /* = core::int */ #this) → core::int
   return 0;
-static inline-class-member method I|set#i(lowered final self::I #this, core::int val) → void {}
+static inline-class-member method I|set#i(lowered final self::I /* = core::int */ #this, core::int val) → void {}
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.weak.modular.expect
index 65dca50dcee..396539a787b 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.weak.modular.expect
@@ -8,12 +8,12 @@ extension type I(core::int _i) {
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static inline-class-member method I|(dynamic _i) → self::I {
-  lowered final self::I #this = _i;
+static inline-class-member method I|(dynamic _i) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = _i;
   return #this;
 }
-static inline-class-member method I|_#new#tearOff(dynamic _i) → self::I
+static inline-class-member method I|_#new#tearOff(dynamic _i) → self::I /* = core::int */
   return self::I|(_i);
-static inline-class-member method I|get#i(lowered final self::I #this) → core::int
+static inline-class-member method I|get#i(lowered final self::I /* = core::int */ #this) → core::int
   return 0;
-static inline-class-member method I|set#i(lowered final self::I #this, core::int val) → void {}
+static inline-class-member method I|set#i(lowered final self::I /* = core::int */ #this, core::int val) → void {}
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.weak.outline.expect
index 187f4ea98d7..9165748e4a7 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.weak.outline.expect
@@ -8,11 +8,11 @@ extension type I(core::int _i) {
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static inline-class-member method I|(dynamic _i) → self::I
+static inline-class-member method I|(dynamic _i) → self::I /* = core::int */
   ;
-static inline-class-member method I|_#new#tearOff(dynamic _i) → self::I
+static inline-class-member method I|_#new#tearOff(dynamic _i) → self::I /* = core::int */
   return self::I|(_i);
-static inline-class-member method I|get#i(lowered final self::I #this) → core::int
+static inline-class-member method I|get#i(lowered final self::I /* = core::int */ #this) → core::int
   ;
-static inline-class-member method I|set#i(lowered final self::I #this, core::int val) → void
+static inline-class-member method I|set#i(lowered final self::I /* = core::int */ #this, core::int val) → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.weak.transformed.expect
index 65dca50dcee..396539a787b 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51299.dart.weak.transformed.expect
@@ -8,12 +8,12 @@ extension type I(core::int _i) {
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static inline-class-member method I|(dynamic _i) → self::I {
-  lowered final self::I #this = _i;
+static inline-class-member method I|(dynamic _i) → self::I /* = core::int */ {
+  lowered final self::I /* = core::int */ #this = _i;
   return #this;
 }
-static inline-class-member method I|_#new#tearOff(dynamic _i) → self::I
+static inline-class-member method I|_#new#tearOff(dynamic _i) → self::I /* = core::int */
   return self::I|(_i);
-static inline-class-member method I|get#i(lowered final self::I #this) → core::int
+static inline-class-member method I|get#i(lowered final self::I /* = core::int */ #this) → core::int
   return 0;
-static inline-class-member method I|set#i(lowered final self::I #this, core::int val) → void {}
+static inline-class-member method I|set#i(lowered final self::I /* = core::int */ #this, core::int val) → void {}
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.strong.expect
index f7dc8b7284b..08e5e315f76 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.strong.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension ObjectToJSExportedDartObject on core::Object {
   get toJS = self::ObjectToJSExportedDartObject|get#toJS;
 }
-extension ListToJSArray on core::List<self::JSAny?> {
+extension ListToJSArray on core::List<self::JSAny? /* = core::Object? */> {
   get toJS = self::ListToJSArray|get#toJS;
 }
 extension DoubleToJSNumber on core::double {
@@ -15,58 +15,58 @@ extension type JSAny(core::Object value) {
   constructor • = self::JSAny|;
   tearoff • = self::JSAny|_#new#tearOff;
 }
-extension type JSObject(core::Object value) implements self::JSAny {
+extension type JSObject(core::Object value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSObject|;
   tearoff • = self::JSObject|_#new#tearOff;
 }
-extension type JSArray(core::List<self::JSAny?> value) implements self::JSObject {
+extension type JSArray(core::List<self::JSAny? /* = core::Object? */> value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSArray|;
   tearoff • = self::JSArray|_#new#tearOff;
 }
-extension type JSExportedDartObject(core::Object value) implements self::JSObject {
+extension type JSExportedDartObject(core::Object value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSExportedDartObject|;
   tearoff • = self::JSExportedDartObject|_#new#tearOff;
 }
-extension type JSNumber(core::double value) implements self::JSAny {
+extension type JSNumber(core::double value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSNumber|;
   tearoff • = self::JSNumber|_#new#tearOff;
 }
-static inline-class-member method JSAny|(dynamic value) → self::JSAny {
-  lowered final self::JSAny #this = value;
+static inline-class-member method JSAny|(dynamic value) → self::JSAny /* = core::Object */ {
+  lowered final self::JSAny /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSAny|_#new#tearOff(dynamic value) → self::JSAny
+static inline-class-member method JSAny|_#new#tearOff(dynamic value) → self::JSAny /* = core::Object */
   return self::JSAny|(value);
-static inline-class-member method JSObject|(dynamic value) → self::JSObject {
-  lowered final self::JSObject #this = value;
+static inline-class-member method JSObject|(dynamic value) → self::JSObject /* = core::Object */ {
+  lowered final self::JSObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSObject|_#new#tearOff(dynamic value) → self::JSObject
+static inline-class-member method JSObject|_#new#tearOff(dynamic value) → self::JSObject /* = core::Object */
   return self::JSObject|(value);
-static inline-class-member method JSArray|(dynamic value) → self::JSArray {
-  lowered final self::JSArray #this = value;
+static inline-class-member method JSArray|(dynamic value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ {
+  lowered final self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ #this = value;
   return #this;
 }
-static inline-class-member method JSArray|_#new#tearOff(dynamic value) → self::JSArray
+static inline-class-member method JSArray|_#new#tearOff(dynamic value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(value);
-static inline-class-member method JSExportedDartObject|(dynamic value) → self::JSExportedDartObject {
-  lowered final self::JSExportedDartObject #this = value;
+static inline-class-member method JSExportedDartObject|(dynamic value) → self::JSExportedDartObject /* = core::Object */ {
+  lowered final self::JSExportedDartObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSExportedDartObject|_#new#tearOff(dynamic value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|_#new#tearOff(dynamic value) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(value);
-static inline-class-member method JSNumber|(dynamic value) → self::JSNumber {
-  lowered final self::JSNumber #this = value;
+static inline-class-member method JSNumber|(dynamic value) → self::JSNumber /* = core::double */ {
+  lowered final self::JSNumber /* = core::double */ #this = value;
   return #this;
 }
-static inline-class-member method JSNumber|_#new#tearOff(dynamic value) → self::JSNumber
+static inline-class-member method JSNumber|_#new#tearOff(dynamic value) → self::JSNumber /* = core::double */
   return self::JSNumber|(value);
-static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
+static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(#this);
-static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
+static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny? /* = core::Object? */> #this) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(#this);
-static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
+static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber /* = core::double */
   return self::JSNumber|(#this);
 static method main() → void {
-  self::JSArray arr = self::ListToJSArray|get#toJS(<self::JSAny>[self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")]);
+  self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ arr = self::ListToJSArray|get#toJS(<self::JSAny /* = core::Object */>[self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")]);
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.strong.transformed.expect
index ae36123aeae..e29d4e1d111 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.strong.transformed.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension ObjectToJSExportedDartObject on core::Object {
   get toJS = self::ObjectToJSExportedDartObject|get#toJS;
 }
-extension ListToJSArray on core::List<self::JSAny?> {
+extension ListToJSArray on core::List<self::JSAny? /* = core::Object? */> {
   get toJS = self::ListToJSArray|get#toJS;
 }
 extension DoubleToJSNumber on core::double {
@@ -15,58 +15,58 @@ extension type JSAny(core::Object value) {
   constructor • = self::JSAny|;
   tearoff • = self::JSAny|_#new#tearOff;
 }
-extension type JSObject(core::Object value) implements self::JSAny {
+extension type JSObject(core::Object value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSObject|;
   tearoff • = self::JSObject|_#new#tearOff;
 }
-extension type JSArray(core::List<self::JSAny?> value) implements self::JSObject {
+extension type JSArray(core::List<self::JSAny? /* = core::Object? */> value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSArray|;
   tearoff • = self::JSArray|_#new#tearOff;
 }
-extension type JSExportedDartObject(core::Object value) implements self::JSObject {
+extension type JSExportedDartObject(core::Object value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSExportedDartObject|;
   tearoff • = self::JSExportedDartObject|_#new#tearOff;
 }
-extension type JSNumber(core::double value) implements self::JSAny {
+extension type JSNumber(core::double value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSNumber|;
   tearoff • = self::JSNumber|_#new#tearOff;
 }
-static inline-class-member method JSAny|(dynamic value) → self::JSAny {
-  lowered final self::JSAny #this = value;
+static inline-class-member method JSAny|(dynamic value) → self::JSAny /* = core::Object */ {
+  lowered final self::JSAny /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSAny|_#new#tearOff(dynamic value) → self::JSAny
+static inline-class-member method JSAny|_#new#tearOff(dynamic value) → self::JSAny /* = core::Object */
   return self::JSAny|(value);
-static inline-class-member method JSObject|(dynamic value) → self::JSObject {
-  lowered final self::JSObject #this = value;
+static inline-class-member method JSObject|(dynamic value) → self::JSObject /* = core::Object */ {
+  lowered final self::JSObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSObject|_#new#tearOff(dynamic value) → self::JSObject
+static inline-class-member method JSObject|_#new#tearOff(dynamic value) → self::JSObject /* = core::Object */
   return self::JSObject|(value);
-static inline-class-member method JSArray|(dynamic value) → self::JSArray {
-  lowered final self::JSArray #this = value;
+static inline-class-member method JSArray|(dynamic value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ {
+  lowered final self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ #this = value;
   return #this;
 }
-static inline-class-member method JSArray|_#new#tearOff(dynamic value) → self::JSArray
+static inline-class-member method JSArray|_#new#tearOff(dynamic value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(value);
-static inline-class-member method JSExportedDartObject|(dynamic value) → self::JSExportedDartObject {
-  lowered final self::JSExportedDartObject #this = value;
+static inline-class-member method JSExportedDartObject|(dynamic value) → self::JSExportedDartObject /* = core::Object */ {
+  lowered final self::JSExportedDartObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSExportedDartObject|_#new#tearOff(dynamic value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|_#new#tearOff(dynamic value) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(value);
-static inline-class-member method JSNumber|(dynamic value) → self::JSNumber {
-  lowered final self::JSNumber #this = value;
+static inline-class-member method JSNumber|(dynamic value) → self::JSNumber /* = core::double */ {
+  lowered final self::JSNumber /* = core::double */ #this = value;
   return #this;
 }
-static inline-class-member method JSNumber|_#new#tearOff(dynamic value) → self::JSNumber
+static inline-class-member method JSNumber|_#new#tearOff(dynamic value) → self::JSNumber /* = core::double */
   return self::JSNumber|(value);
-static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
+static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(#this);
-static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
+static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny? /* = core::Object? */> #this) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(#this);
-static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
+static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber /* = core::double */
   return self::JSNumber|(#this);
 static method main() → void {
-  self::JSArray arr = self::ListToJSArray|get#toJS(core::_GrowableList::_literal2<self::JSAny>(self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")));
+  self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ arr = self::ListToJSArray|get#toJS(core::_GrowableList::_literal2<self::JSAny /* = core::Object */>(self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")));
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.weak.expect
index f7dc8b7284b..08e5e315f76 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.weak.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension ObjectToJSExportedDartObject on core::Object {
   get toJS = self::ObjectToJSExportedDartObject|get#toJS;
 }
-extension ListToJSArray on core::List<self::JSAny?> {
+extension ListToJSArray on core::List<self::JSAny? /* = core::Object? */> {
   get toJS = self::ListToJSArray|get#toJS;
 }
 extension DoubleToJSNumber on core::double {
@@ -15,58 +15,58 @@ extension type JSAny(core::Object value) {
   constructor • = self::JSAny|;
   tearoff • = self::JSAny|_#new#tearOff;
 }
-extension type JSObject(core::Object value) implements self::JSAny {
+extension type JSObject(core::Object value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSObject|;
   tearoff • = self::JSObject|_#new#tearOff;
 }
-extension type JSArray(core::List<self::JSAny?> value) implements self::JSObject {
+extension type JSArray(core::List<self::JSAny? /* = core::Object? */> value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSArray|;
   tearoff • = self::JSArray|_#new#tearOff;
 }
-extension type JSExportedDartObject(core::Object value) implements self::JSObject {
+extension type JSExportedDartObject(core::Object value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSExportedDartObject|;
   tearoff • = self::JSExportedDartObject|_#new#tearOff;
 }
-extension type JSNumber(core::double value) implements self::JSAny {
+extension type JSNumber(core::double value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSNumber|;
   tearoff • = self::JSNumber|_#new#tearOff;
 }
-static inline-class-member method JSAny|(dynamic value) → self::JSAny {
-  lowered final self::JSAny #this = value;
+static inline-class-member method JSAny|(dynamic value) → self::JSAny /* = core::Object */ {
+  lowered final self::JSAny /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSAny|_#new#tearOff(dynamic value) → self::JSAny
+static inline-class-member method JSAny|_#new#tearOff(dynamic value) → self::JSAny /* = core::Object */
   return self::JSAny|(value);
-static inline-class-member method JSObject|(dynamic value) → self::JSObject {
-  lowered final self::JSObject #this = value;
+static inline-class-member method JSObject|(dynamic value) → self::JSObject /* = core::Object */ {
+  lowered final self::JSObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSObject|_#new#tearOff(dynamic value) → self::JSObject
+static inline-class-member method JSObject|_#new#tearOff(dynamic value) → self::JSObject /* = core::Object */
   return self::JSObject|(value);
-static inline-class-member method JSArray|(dynamic value) → self::JSArray {
-  lowered final self::JSArray #this = value;
+static inline-class-member method JSArray|(dynamic value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ {
+  lowered final self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ #this = value;
   return #this;
 }
-static inline-class-member method JSArray|_#new#tearOff(dynamic value) → self::JSArray
+static inline-class-member method JSArray|_#new#tearOff(dynamic value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(value);
-static inline-class-member method JSExportedDartObject|(dynamic value) → self::JSExportedDartObject {
-  lowered final self::JSExportedDartObject #this = value;
+static inline-class-member method JSExportedDartObject|(dynamic value) → self::JSExportedDartObject /* = core::Object */ {
+  lowered final self::JSExportedDartObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSExportedDartObject|_#new#tearOff(dynamic value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|_#new#tearOff(dynamic value) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(value);
-static inline-class-member method JSNumber|(dynamic value) → self::JSNumber {
-  lowered final self::JSNumber #this = value;
+static inline-class-member method JSNumber|(dynamic value) → self::JSNumber /* = core::double */ {
+  lowered final self::JSNumber /* = core::double */ #this = value;
   return #this;
 }
-static inline-class-member method JSNumber|_#new#tearOff(dynamic value) → self::JSNumber
+static inline-class-member method JSNumber|_#new#tearOff(dynamic value) → self::JSNumber /* = core::double */
   return self::JSNumber|(value);
-static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
+static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(#this);
-static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
+static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny? /* = core::Object? */> #this) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(#this);
-static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
+static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber /* = core::double */
   return self::JSNumber|(#this);
 static method main() → void {
-  self::JSArray arr = self::ListToJSArray|get#toJS(<self::JSAny>[self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")]);
+  self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ arr = self::ListToJSArray|get#toJS(<self::JSAny /* = core::Object */>[self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")]);
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.weak.modular.expect
index f7dc8b7284b..08e5e315f76 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.weak.modular.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension ObjectToJSExportedDartObject on core::Object {
   get toJS = self::ObjectToJSExportedDartObject|get#toJS;
 }
-extension ListToJSArray on core::List<self::JSAny?> {
+extension ListToJSArray on core::List<self::JSAny? /* = core::Object? */> {
   get toJS = self::ListToJSArray|get#toJS;
 }
 extension DoubleToJSNumber on core::double {
@@ -15,58 +15,58 @@ extension type JSAny(core::Object value) {
   constructor • = self::JSAny|;
   tearoff • = self::JSAny|_#new#tearOff;
 }
-extension type JSObject(core::Object value) implements self::JSAny {
+extension type JSObject(core::Object value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSObject|;
   tearoff • = self::JSObject|_#new#tearOff;
 }
-extension type JSArray(core::List<self::JSAny?> value) implements self::JSObject {
+extension type JSArray(core::List<self::JSAny? /* = core::Object? */> value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSArray|;
   tearoff • = self::JSArray|_#new#tearOff;
 }
-extension type JSExportedDartObject(core::Object value) implements self::JSObject {
+extension type JSExportedDartObject(core::Object value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSExportedDartObject|;
   tearoff • = self::JSExportedDartObject|_#new#tearOff;
 }
-extension type JSNumber(core::double value) implements self::JSAny {
+extension type JSNumber(core::double value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSNumber|;
   tearoff • = self::JSNumber|_#new#tearOff;
 }
-static inline-class-member method JSAny|(dynamic value) → self::JSAny {
-  lowered final self::JSAny #this = value;
+static inline-class-member method JSAny|(dynamic value) → self::JSAny /* = core::Object */ {
+  lowered final self::JSAny /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSAny|_#new#tearOff(dynamic value) → self::JSAny
+static inline-class-member method JSAny|_#new#tearOff(dynamic value) → self::JSAny /* = core::Object */
   return self::JSAny|(value);
-static inline-class-member method JSObject|(dynamic value) → self::JSObject {
-  lowered final self::JSObject #this = value;
+static inline-class-member method JSObject|(dynamic value) → self::JSObject /* = core::Object */ {
+  lowered final self::JSObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSObject|_#new#tearOff(dynamic value) → self::JSObject
+static inline-class-member method JSObject|_#new#tearOff(dynamic value) → self::JSObject /* = core::Object */
   return self::JSObject|(value);
-static inline-class-member method JSArray|(dynamic value) → self::JSArray {
-  lowered final self::JSArray #this = value;
+static inline-class-member method JSArray|(dynamic value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ {
+  lowered final self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ #this = value;
   return #this;
 }
-static inline-class-member method JSArray|_#new#tearOff(dynamic value) → self::JSArray
+static inline-class-member method JSArray|_#new#tearOff(dynamic value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(value);
-static inline-class-member method JSExportedDartObject|(dynamic value) → self::JSExportedDartObject {
-  lowered final self::JSExportedDartObject #this = value;
+static inline-class-member method JSExportedDartObject|(dynamic value) → self::JSExportedDartObject /* = core::Object */ {
+  lowered final self::JSExportedDartObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSExportedDartObject|_#new#tearOff(dynamic value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|_#new#tearOff(dynamic value) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(value);
-static inline-class-member method JSNumber|(dynamic value) → self::JSNumber {
-  lowered final self::JSNumber #this = value;
+static inline-class-member method JSNumber|(dynamic value) → self::JSNumber /* = core::double */ {
+  lowered final self::JSNumber /* = core::double */ #this = value;
   return #this;
 }
-static inline-class-member method JSNumber|_#new#tearOff(dynamic value) → self::JSNumber
+static inline-class-member method JSNumber|_#new#tearOff(dynamic value) → self::JSNumber /* = core::double */
   return self::JSNumber|(value);
-static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
+static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(#this);
-static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
+static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny? /* = core::Object? */> #this) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(#this);
-static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
+static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber /* = core::double */
   return self::JSNumber|(#this);
 static method main() → void {
-  self::JSArray arr = self::ListToJSArray|get#toJS(<self::JSAny>[self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")]);
+  self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ arr = self::ListToJSArray|get#toJS(<self::JSAny /* = core::Object */>[self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")]);
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.weak.outline.expect
index 3e7c3acf28d..9e8b0cceaa4 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.weak.outline.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension ObjectToJSExportedDartObject on core::Object {
   get toJS = self::ObjectToJSExportedDartObject|get#toJS;
 }
-extension ListToJSArray on core::List<self::JSAny?> {
+extension ListToJSArray on core::List<self::JSAny? /* = core::Object? */> {
   get toJS = self::ListToJSArray|get#toJS;
 }
 extension DoubleToJSNumber on core::double {
@@ -15,47 +15,47 @@ extension type JSAny(core::Object value) {
   constructor • = self::JSAny|;
   tearoff • = self::JSAny|_#new#tearOff;
 }
-extension type JSObject(core::Object value) implements self::JSAny {
+extension type JSObject(core::Object value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSObject|;
   tearoff • = self::JSObject|_#new#tearOff;
 }
-extension type JSArray(core::List<self::JSAny?> value) implements self::JSObject {
+extension type JSArray(core::List<self::JSAny? /* = core::Object? */> value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSArray|;
   tearoff • = self::JSArray|_#new#tearOff;
 }
-extension type JSExportedDartObject(core::Object value) implements self::JSObject {
+extension type JSExportedDartObject(core::Object value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSExportedDartObject|;
   tearoff • = self::JSExportedDartObject|_#new#tearOff;
 }
-extension type JSNumber(core::double value) implements self::JSAny {
+extension type JSNumber(core::double value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSNumber|;
   tearoff • = self::JSNumber|_#new#tearOff;
 }
-static inline-class-member method JSAny|(dynamic value) → self::JSAny
+static inline-class-member method JSAny|(dynamic value) → self::JSAny /* = core::Object */
   ;
-static inline-class-member method JSAny|_#new#tearOff(dynamic value) → self::JSAny
+static inline-class-member method JSAny|_#new#tearOff(dynamic value) → self::JSAny /* = core::Object */
   return self::JSAny|(value);
-static inline-class-member method JSObject|(dynamic value) → self::JSObject
+static inline-class-member method JSObject|(dynamic value) → self::JSObject /* = core::Object */
   ;
-static inline-class-member method JSObject|_#new#tearOff(dynamic value) → self::JSObject
+static inline-class-member method JSObject|_#new#tearOff(dynamic value) → self::JSObject /* = core::Object */
   return self::JSObject|(value);
-static inline-class-member method JSArray|(dynamic value) → self::JSArray
+static inline-class-member method JSArray|(dynamic value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   ;
-static inline-class-member method JSArray|_#new#tearOff(dynamic value) → self::JSArray
+static inline-class-member method JSArray|_#new#tearOff(dynamic value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(value);
-static inline-class-member method JSExportedDartObject|(dynamic value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|(dynamic value) → self::JSExportedDartObject /* = core::Object */
   ;
-static inline-class-member method JSExportedDartObject|_#new#tearOff(dynamic value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|_#new#tearOff(dynamic value) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(value);
-static inline-class-member method JSNumber|(dynamic value) → self::JSNumber
+static inline-class-member method JSNumber|(dynamic value) → self::JSNumber /* = core::double */
   ;
-static inline-class-member method JSNumber|_#new#tearOff(dynamic value) → self::JSNumber
+static inline-class-member method JSNumber|_#new#tearOff(dynamic value) → self::JSNumber /* = core::double */
   return self::JSNumber|(value);
-static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
+static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject /* = core::Object */
   ;
-static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
+static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny? /* = core::Object? */> #this) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   ;
-static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
+static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber /* = core::double */
   ;
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.weak.transformed.expect
index ae36123aeae..e29d4e1d111 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue51556.dart.weak.transformed.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension ObjectToJSExportedDartObject on core::Object {
   get toJS = self::ObjectToJSExportedDartObject|get#toJS;
 }
-extension ListToJSArray on core::List<self::JSAny?> {
+extension ListToJSArray on core::List<self::JSAny? /* = core::Object? */> {
   get toJS = self::ListToJSArray|get#toJS;
 }
 extension DoubleToJSNumber on core::double {
@@ -15,58 +15,58 @@ extension type JSAny(core::Object value) {
   constructor • = self::JSAny|;
   tearoff • = self::JSAny|_#new#tearOff;
 }
-extension type JSObject(core::Object value) implements self::JSAny {
+extension type JSObject(core::Object value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSObject|;
   tearoff • = self::JSObject|_#new#tearOff;
 }
-extension type JSArray(core::List<self::JSAny?> value) implements self::JSObject {
+extension type JSArray(core::List<self::JSAny? /* = core::Object? */> value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSArray|;
   tearoff • = self::JSArray|_#new#tearOff;
 }
-extension type JSExportedDartObject(core::Object value) implements self::JSObject {
+extension type JSExportedDartObject(core::Object value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSExportedDartObject|;
   tearoff • = self::JSExportedDartObject|_#new#tearOff;
 }
-extension type JSNumber(core::double value) implements self::JSAny {
+extension type JSNumber(core::double value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSNumber|;
   tearoff • = self::JSNumber|_#new#tearOff;
 }
-static inline-class-member method JSAny|(dynamic value) → self::JSAny {
-  lowered final self::JSAny #this = value;
+static inline-class-member method JSAny|(dynamic value) → self::JSAny /* = core::Object */ {
+  lowered final self::JSAny /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSAny|_#new#tearOff(dynamic value) → self::JSAny
+static inline-class-member method JSAny|_#new#tearOff(dynamic value) → self::JSAny /* = core::Object */
   return self::JSAny|(value);
-static inline-class-member method JSObject|(dynamic value) → self::JSObject {
-  lowered final self::JSObject #this = value;
+static inline-class-member method JSObject|(dynamic value) → self::JSObject /* = core::Object */ {
+  lowered final self::JSObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSObject|_#new#tearOff(dynamic value) → self::JSObject
+static inline-class-member method JSObject|_#new#tearOff(dynamic value) → self::JSObject /* = core::Object */
   return self::JSObject|(value);
-static inline-class-member method JSArray|(dynamic value) → self::JSArray {
-  lowered final self::JSArray #this = value;
+static inline-class-member method JSArray|(dynamic value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ {
+  lowered final self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ #this = value;
   return #this;
 }
-static inline-class-member method JSArray|_#new#tearOff(dynamic value) → self::JSArray
+static inline-class-member method JSArray|_#new#tearOff(dynamic value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(value);
-static inline-class-member method JSExportedDartObject|(dynamic value) → self::JSExportedDartObject {
-  lowered final self::JSExportedDartObject #this = value;
+static inline-class-member method JSExportedDartObject|(dynamic value) → self::JSExportedDartObject /* = core::Object */ {
+  lowered final self::JSExportedDartObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSExportedDartObject|_#new#tearOff(dynamic value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|_#new#tearOff(dynamic value) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(value);
-static inline-class-member method JSNumber|(dynamic value) → self::JSNumber {
-  lowered final self::JSNumber #this = value;
+static inline-class-member method JSNumber|(dynamic value) → self::JSNumber /* = core::double */ {
+  lowered final self::JSNumber /* = core::double */ #this = value;
   return #this;
 }
-static inline-class-member method JSNumber|_#new#tearOff(dynamic value) → self::JSNumber
+static inline-class-member method JSNumber|_#new#tearOff(dynamic value) → self::JSNumber /* = core::double */
   return self::JSNumber|(value);
-static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
+static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(#this);
-static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
+static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny? /* = core::Object? */> #this) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(#this);
-static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
+static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber /* = core::double */
   return self::JSNumber|(#this);
 static method main() → void {
-  self::JSArray arr = self::ListToJSArray|get#toJS(core::_GrowableList::_literal2<self::JSAny>(self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")));
+  self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ arr = self::ListToJSArray|get#toJS(core::_GrowableList::_literal2<self::JSAny /* = core::Object */>(self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")));
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.strong.expect
index 60718a67aa0..ad1ac13a2be 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.strong.expect
@@ -37,61 +37,61 @@ extension type Bar<T extends core::Object? = dynamic>(dynamic i) {
   constructor • = self::Bar|;
   tearoff • = self::Bar|_#new#tearOff;
 }
-static inline-class-member method Foo|_(dynamic i) → self::Foo {
-  lowered final self::Foo #this = i;
+static inline-class-member method Foo|_(dynamic i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Foo|_#_#tearOff(dynamic i) → self::Foo
+static inline-class-member method Foo|_#_#tearOff(dynamic i) → self::Foo /* = core::int */
   return self::Foo|_(i);
-static inline-class-member method Foo|(core::int i) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|(core::int i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|_(i.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo /* = core::int */
   return self::Foo|(i);
-static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|named(a, subtract: b);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed1(a, b);
-static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final core::int #t1 = b;
   #this = self::Foo|named(a, subtract: #t1);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed2(a, b);
-static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
-  lowered final self::Foo #this = value.{core::num::-}(subtract){(core::num) → core::int};
+static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = value.{core::num::-}(subtract){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
+static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo /* = core::int */
   return self::Foo|named(value, subtract: subtract);
-static inline-class-member method Foo|erroneous() → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|erroneous() → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/issue52119.dart:12:26: Error: Couldn't find constructor 'Foo.unresolved'.
   Foo.erroneous() : this.unresolved(); // Error
                          ^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo
+static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo /* = core::int */
   return self::Foo|erroneous();
-static inline-class-member method Bar|_<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_::T%> {
-  lowered final self::Bar<self::Bar|_::T%> #this = i;
+static inline-class-member method Bar|_<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_::T%> /* = dynamic */ {
+  lowered final self::Bar<self::Bar|_::T%> /* = dynamic */ #this = i;
   return #this;
 }
-static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_#_#tearOff::T%>
+static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_#_#tearOff::T%> /* = dynamic */
   return self::Bar|_<self::Bar|_#_#tearOff::T%>(i);
-static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
-  lowered final self::Bar<self::Bar|::T%> #this;
+static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> /* = dynamic */ {
+  lowered final self::Bar<self::Bar|::T%> /* = dynamic */ #this;
   #this = self::Bar|_<self::Bar|::T%>(i);
   return #this;
 }
-static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
+static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%> /* = dynamic */
   return self::Bar|<self::Bar|_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(44, self::Foo|(42) as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.strong.transformed.expect
index 60718a67aa0..ad1ac13a2be 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.strong.transformed.expect
@@ -37,61 +37,61 @@ extension type Bar<T extends core::Object? = dynamic>(dynamic i) {
   constructor • = self::Bar|;
   tearoff • = self::Bar|_#new#tearOff;
 }
-static inline-class-member method Foo|_(dynamic i) → self::Foo {
-  lowered final self::Foo #this = i;
+static inline-class-member method Foo|_(dynamic i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Foo|_#_#tearOff(dynamic i) → self::Foo
+static inline-class-member method Foo|_#_#tearOff(dynamic i) → self::Foo /* = core::int */
   return self::Foo|_(i);
-static inline-class-member method Foo|(core::int i) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|(core::int i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|_(i.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo /* = core::int */
   return self::Foo|(i);
-static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|named(a, subtract: b);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed1(a, b);
-static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final core::int #t1 = b;
   #this = self::Foo|named(a, subtract: #t1);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed2(a, b);
-static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
-  lowered final self::Foo #this = value.{core::num::-}(subtract){(core::num) → core::int};
+static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = value.{core::num::-}(subtract){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
+static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo /* = core::int */
   return self::Foo|named(value, subtract: subtract);
-static inline-class-member method Foo|erroneous() → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|erroneous() → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/issue52119.dart:12:26: Error: Couldn't find constructor 'Foo.unresolved'.
   Foo.erroneous() : this.unresolved(); // Error
                          ^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo
+static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo /* = core::int */
   return self::Foo|erroneous();
-static inline-class-member method Bar|_<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_::T%> {
-  lowered final self::Bar<self::Bar|_::T%> #this = i;
+static inline-class-member method Bar|_<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_::T%> /* = dynamic */ {
+  lowered final self::Bar<self::Bar|_::T%> /* = dynamic */ #this = i;
   return #this;
 }
-static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_#_#tearOff::T%>
+static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_#_#tearOff::T%> /* = dynamic */
   return self::Bar|_<self::Bar|_#_#tearOff::T%>(i);
-static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
-  lowered final self::Bar<self::Bar|::T%> #this;
+static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> /* = dynamic */ {
+  lowered final self::Bar<self::Bar|::T%> /* = dynamic */ #this;
   #this = self::Bar|_<self::Bar|::T%>(i);
   return #this;
 }
-static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
+static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%> /* = dynamic */
   return self::Bar|<self::Bar|_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(44, self::Foo|(42) as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.weak.expect
index 60718a67aa0..ad1ac13a2be 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.weak.expect
@@ -37,61 +37,61 @@ extension type Bar<T extends core::Object? = dynamic>(dynamic i) {
   constructor • = self::Bar|;
   tearoff • = self::Bar|_#new#tearOff;
 }
-static inline-class-member method Foo|_(dynamic i) → self::Foo {
-  lowered final self::Foo #this = i;
+static inline-class-member method Foo|_(dynamic i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Foo|_#_#tearOff(dynamic i) → self::Foo
+static inline-class-member method Foo|_#_#tearOff(dynamic i) → self::Foo /* = core::int */
   return self::Foo|_(i);
-static inline-class-member method Foo|(core::int i) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|(core::int i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|_(i.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo /* = core::int */
   return self::Foo|(i);
-static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|named(a, subtract: b);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed1(a, b);
-static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final core::int #t1 = b;
   #this = self::Foo|named(a, subtract: #t1);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed2(a, b);
-static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
-  lowered final self::Foo #this = value.{core::num::-}(subtract){(core::num) → core::int};
+static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = value.{core::num::-}(subtract){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
+static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo /* = core::int */
   return self::Foo|named(value, subtract: subtract);
-static inline-class-member method Foo|erroneous() → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|erroneous() → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/issue52119.dart:12:26: Error: Couldn't find constructor 'Foo.unresolved'.
   Foo.erroneous() : this.unresolved(); // Error
                          ^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo
+static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo /* = core::int */
   return self::Foo|erroneous();
-static inline-class-member method Bar|_<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_::T%> {
-  lowered final self::Bar<self::Bar|_::T%> #this = i;
+static inline-class-member method Bar|_<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_::T%> /* = dynamic */ {
+  lowered final self::Bar<self::Bar|_::T%> /* = dynamic */ #this = i;
   return #this;
 }
-static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_#_#tearOff::T%>
+static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_#_#tearOff::T%> /* = dynamic */
   return self::Bar|_<self::Bar|_#_#tearOff::T%>(i);
-static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
-  lowered final self::Bar<self::Bar|::T%> #this;
+static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> /* = dynamic */ {
+  lowered final self::Bar<self::Bar|::T%> /* = dynamic */ #this;
   #this = self::Bar|_<self::Bar|::T%>(i);
   return #this;
 }
-static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
+static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%> /* = dynamic */
   return self::Bar|<self::Bar|_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(44, self::Foo|(42) as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.weak.modular.expect
index 60718a67aa0..ad1ac13a2be 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.weak.modular.expect
@@ -37,61 +37,61 @@ extension type Bar<T extends core::Object? = dynamic>(dynamic i) {
   constructor • = self::Bar|;
   tearoff • = self::Bar|_#new#tearOff;
 }
-static inline-class-member method Foo|_(dynamic i) → self::Foo {
-  lowered final self::Foo #this = i;
+static inline-class-member method Foo|_(dynamic i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Foo|_#_#tearOff(dynamic i) → self::Foo
+static inline-class-member method Foo|_#_#tearOff(dynamic i) → self::Foo /* = core::int */
   return self::Foo|_(i);
-static inline-class-member method Foo|(core::int i) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|(core::int i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|_(i.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo /* = core::int */
   return self::Foo|(i);
-static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|named(a, subtract: b);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed1(a, b);
-static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final core::int #t1 = b;
   #this = self::Foo|named(a, subtract: #t1);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed2(a, b);
-static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
-  lowered final self::Foo #this = value.{core::num::-}(subtract){(core::num) → core::int};
+static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = value.{core::num::-}(subtract){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
+static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo /* = core::int */
   return self::Foo|named(value, subtract: subtract);
-static inline-class-member method Foo|erroneous() → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|erroneous() → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/issue52119.dart:12:26: Error: Couldn't find constructor 'Foo.unresolved'.
   Foo.erroneous() : this.unresolved(); // Error
                          ^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo
+static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo /* = core::int */
   return self::Foo|erroneous();
-static inline-class-member method Bar|_<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_::T%> {
-  lowered final self::Bar<self::Bar|_::T%> #this = i;
+static inline-class-member method Bar|_<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_::T%> /* = dynamic */ {
+  lowered final self::Bar<self::Bar|_::T%> /* = dynamic */ #this = i;
   return #this;
 }
-static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_#_#tearOff::T%>
+static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_#_#tearOff::T%> /* = dynamic */
   return self::Bar|_<self::Bar|_#_#tearOff::T%>(i);
-static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
-  lowered final self::Bar<self::Bar|::T%> #this;
+static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> /* = dynamic */ {
+  lowered final self::Bar<self::Bar|::T%> /* = dynamic */ #this;
   #this = self::Bar|_<self::Bar|::T%>(i);
   return #this;
 }
-static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
+static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%> /* = dynamic */
   return self::Bar|<self::Bar|_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(44, self::Foo|(42) as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.weak.outline.expect
index beece73b54a..9ec6bd34b83 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.weak.outline.expect
@@ -22,37 +22,37 @@ extension type Bar<T extends core::Object? = dynamic>(dynamic i) {
   constructor • = self::Bar|;
   tearoff • = self::Bar|_#new#tearOff;
 }
-static inline-class-member method Foo|_(dynamic i) → self::Foo
+static inline-class-member method Foo|_(dynamic i) → self::Foo /* = core::int */
   ;
-static inline-class-member method Foo|_#_#tearOff(dynamic i) → self::Foo
+static inline-class-member method Foo|_#_#tearOff(dynamic i) → self::Foo /* = core::int */
   return self::Foo|_(i);
-static inline-class-member method Foo|(core::int i) → self::Foo
+static inline-class-member method Foo|(core::int i) → self::Foo /* = core::int */
   ;
-static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo /* = core::int */
   return self::Foo|(i);
-static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo /* = core::int */
   ;
-static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed1(a, b);
-static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo /* = core::int */
   ;
-static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed2(a, b);
-static inline-class-member method Foo|named(core::int value, {required core::int subtract = null}) → self::Foo
+static inline-class-member method Foo|named(core::int value, {required core::int subtract = null}) → self::Foo /* = core::int */
   ;
-static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
+static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo /* = core::int */
   return self::Foo|named(value, subtract: subtract);
-static inline-class-member method Foo|erroneous() → self::Foo
+static inline-class-member method Foo|erroneous() → self::Foo /* = core::int */
   ;
-static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo
+static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo /* = core::int */
   return self::Foo|erroneous();
-static inline-class-member method Bar|_<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_::T%>
+static inline-class-member method Bar|_<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_::T%> /* = dynamic */
   ;
-static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_#_#tearOff::T%>
+static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_#_#tearOff::T%> /* = dynamic */
   return self::Bar|_<self::Bar|_#_#tearOff::T%>(i);
-static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%>
+static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> /* = dynamic */
   ;
-static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
+static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%> /* = dynamic */
   return self::Bar|<self::Bar|_#new#tearOff::T%>(i);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.weak.transformed.expect
index 60718a67aa0..ad1ac13a2be 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52119.dart.weak.transformed.expect
@@ -37,61 +37,61 @@ extension type Bar<T extends core::Object? = dynamic>(dynamic i) {
   constructor • = self::Bar|;
   tearoff • = self::Bar|_#new#tearOff;
 }
-static inline-class-member method Foo|_(dynamic i) → self::Foo {
-  lowered final self::Foo #this = i;
+static inline-class-member method Foo|_(dynamic i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Foo|_#_#tearOff(dynamic i) → self::Foo
+static inline-class-member method Foo|_#_#tearOff(dynamic i) → self::Foo /* = core::int */
   return self::Foo|_(i);
-static inline-class-member method Foo|(core::int i) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|(core::int i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|_(i.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo /* = core::int */
   return self::Foo|(i);
-static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|named(a, subtract: b);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed1(a, b);
-static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final core::int #t1 = b;
   #this = self::Foo|named(a, subtract: #t1);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed2(a, b);
-static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
-  lowered final self::Foo #this = value.{core::num::-}(subtract){(core::num) → core::int};
+static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = value.{core::num::-}(subtract){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
+static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo /* = core::int */
   return self::Foo|named(value, subtract: subtract);
-static inline-class-member method Foo|erroneous() → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|erroneous() → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/issue52119.dart:12:26: Error: Couldn't find constructor 'Foo.unresolved'.
   Foo.erroneous() : this.unresolved(); // Error
                          ^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo
+static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo /* = core::int */
   return self::Foo|erroneous();
-static inline-class-member method Bar|_<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_::T%> {
-  lowered final self::Bar<self::Bar|_::T%> #this = i;
+static inline-class-member method Bar|_<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_::T%> /* = dynamic */ {
+  lowered final self::Bar<self::Bar|_::T%> /* = dynamic */ #this = i;
   return #this;
 }
-static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_#_#tearOff::T%>
+static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(dynamic i) → self::Bar<self::Bar|_#_#tearOff::T%> /* = dynamic */
   return self::Bar|_<self::Bar|_#_#tearOff::T%>(i);
-static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
-  lowered final self::Bar<self::Bar|::T%> #this;
+static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> /* = dynamic */ {
+  lowered final self::Bar<self::Bar|::T%> /* = dynamic */ #this;
   #this = self::Bar|_<self::Bar|::T%>(i);
   return #this;
 }
-static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
+static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%> /* = dynamic */
   return self::Bar|<self::Bar|_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(44, self::Foo|(42) as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.strong.expect
index 9075d7c809b..b9defbc9589 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.strong.expect
@@ -10,27 +10,27 @@ extension type X(core::int obj) {
   constructor named = self::X|named;
   tearoff named = self::X|_#named#tearOff;
 }
-static inline-class-member method X|_(dynamic obj) → self::X {
-  lowered final self::X #this = obj;
+static inline-class-member method X|_(dynamic obj) → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = obj;
   return #this;
 }
-static inline-class-member method X|_#_#tearOff(dynamic obj) → self::X
+static inline-class-member method X|_#_#tearOff(dynamic obj) → self::X /* = core::int */
   return self::X|_(obj);
-static inline-class-member method X|() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#new#tearOff() → self::X
+static inline-class-member method X|_#new#tearOff() → self::X /* = core::int */
   return self::X|();
-static inline-class-member method X|named() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|named() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#named#tearOff() → self::X
+static inline-class-member method X|_#named#tearOff() → self::X /* = core::int */
   return self::X|named();
 static method main() → void {
-  core::print(#C1(){() → self::X} as{Unchecked} core::int);
-  core::print(#C2(){() → self::X} as{Unchecked} core::int);
+  core::print(#C1(){() → self::X /* = core::int */} as{Unchecked} core::int);
+  core::print(#C2(){() → self::X /* = core::int */} as{Unchecked} core::int);
 }
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.strong.transformed.expect
index 9075d7c809b..b9defbc9589 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.strong.transformed.expect
@@ -10,27 +10,27 @@ extension type X(core::int obj) {
   constructor named = self::X|named;
   tearoff named = self::X|_#named#tearOff;
 }
-static inline-class-member method X|_(dynamic obj) → self::X {
-  lowered final self::X #this = obj;
+static inline-class-member method X|_(dynamic obj) → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = obj;
   return #this;
 }
-static inline-class-member method X|_#_#tearOff(dynamic obj) → self::X
+static inline-class-member method X|_#_#tearOff(dynamic obj) → self::X /* = core::int */
   return self::X|_(obj);
-static inline-class-member method X|() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#new#tearOff() → self::X
+static inline-class-member method X|_#new#tearOff() → self::X /* = core::int */
   return self::X|();
-static inline-class-member method X|named() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|named() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#named#tearOff() → self::X
+static inline-class-member method X|_#named#tearOff() → self::X /* = core::int */
   return self::X|named();
 static method main() → void {
-  core::print(#C1(){() → self::X} as{Unchecked} core::int);
-  core::print(#C2(){() → self::X} as{Unchecked} core::int);
+  core::print(#C1(){() → self::X /* = core::int */} as{Unchecked} core::int);
+  core::print(#C2(){() → self::X /* = core::int */} as{Unchecked} core::int);
 }
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.weak.expect
index 9075d7c809b..b9defbc9589 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.weak.expect
@@ -10,27 +10,27 @@ extension type X(core::int obj) {
   constructor named = self::X|named;
   tearoff named = self::X|_#named#tearOff;
 }
-static inline-class-member method X|_(dynamic obj) → self::X {
-  lowered final self::X #this = obj;
+static inline-class-member method X|_(dynamic obj) → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = obj;
   return #this;
 }
-static inline-class-member method X|_#_#tearOff(dynamic obj) → self::X
+static inline-class-member method X|_#_#tearOff(dynamic obj) → self::X /* = core::int */
   return self::X|_(obj);
-static inline-class-member method X|() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#new#tearOff() → self::X
+static inline-class-member method X|_#new#tearOff() → self::X /* = core::int */
   return self::X|();
-static inline-class-member method X|named() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|named() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#named#tearOff() → self::X
+static inline-class-member method X|_#named#tearOff() → self::X /* = core::int */
   return self::X|named();
 static method main() → void {
-  core::print(#C1(){() → self::X} as{Unchecked} core::int);
-  core::print(#C2(){() → self::X} as{Unchecked} core::int);
+  core::print(#C1(){() → self::X /* = core::int */} as{Unchecked} core::int);
+  core::print(#C2(){() → self::X /* = core::int */} as{Unchecked} core::int);
 }
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.weak.modular.expect
index 9075d7c809b..b9defbc9589 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.weak.modular.expect
@@ -10,27 +10,27 @@ extension type X(core::int obj) {
   constructor named = self::X|named;
   tearoff named = self::X|_#named#tearOff;
 }
-static inline-class-member method X|_(dynamic obj) → self::X {
-  lowered final self::X #this = obj;
+static inline-class-member method X|_(dynamic obj) → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = obj;
   return #this;
 }
-static inline-class-member method X|_#_#tearOff(dynamic obj) → self::X
+static inline-class-member method X|_#_#tearOff(dynamic obj) → self::X /* = core::int */
   return self::X|_(obj);
-static inline-class-member method X|() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#new#tearOff() → self::X
+static inline-class-member method X|_#new#tearOff() → self::X /* = core::int */
   return self::X|();
-static inline-class-member method X|named() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|named() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#named#tearOff() → self::X
+static inline-class-member method X|_#named#tearOff() → self::X /* = core::int */
   return self::X|named();
 static method main() → void {
-  core::print(#C1(){() → self::X} as{Unchecked} core::int);
-  core::print(#C2(){() → self::X} as{Unchecked} core::int);
+  core::print(#C1(){() → self::X /* = core::int */} as{Unchecked} core::int);
+  core::print(#C2(){() → self::X /* = core::int */} as{Unchecked} core::int);
 }
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.weak.outline.expect
index 07780daa172..82e1518bee6 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.weak.outline.expect
@@ -10,17 +10,17 @@ extension type X(core::int obj) {
   constructor named = self::X|named;
   tearoff named = self::X|_#named#tearOff;
 }
-static inline-class-member method X|_(dynamic obj) → self::X
+static inline-class-member method X|_(dynamic obj) → self::X /* = core::int */
   ;
-static inline-class-member method X|_#_#tearOff(dynamic obj) → self::X
+static inline-class-member method X|_#_#tearOff(dynamic obj) → self::X /* = core::int */
   return self::X|_(obj);
-static inline-class-member method X|() → self::X
+static inline-class-member method X|() → self::X /* = core::int */
   ;
-static inline-class-member method X|_#new#tearOff() → self::X
+static inline-class-member method X|_#new#tearOff() → self::X /* = core::int */
   return self::X|();
-static inline-class-member method X|named() → self::X
+static inline-class-member method X|named() → self::X /* = core::int */
   ;
-static inline-class-member method X|_#named#tearOff() → self::X
+static inline-class-member method X|_#named#tearOff() → self::X /* = core::int */
   return self::X|named();
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.weak.transformed.expect
index 9075d7c809b..b9defbc9589 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52240.dart.weak.transformed.expect
@@ -10,27 +10,27 @@ extension type X(core::int obj) {
   constructor named = self::X|named;
   tearoff named = self::X|_#named#tearOff;
 }
-static inline-class-member method X|_(dynamic obj) → self::X {
-  lowered final self::X #this = obj;
+static inline-class-member method X|_(dynamic obj) → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = obj;
   return #this;
 }
-static inline-class-member method X|_#_#tearOff(dynamic obj) → self::X
+static inline-class-member method X|_#_#tearOff(dynamic obj) → self::X /* = core::int */
   return self::X|_(obj);
-static inline-class-member method X|() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#new#tearOff() → self::X
+static inline-class-member method X|_#new#tearOff() → self::X /* = core::int */
   return self::X|();
-static inline-class-member method X|named() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|named() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#named#tearOff() → self::X
+static inline-class-member method X|_#named#tearOff() → self::X /* = core::int */
   return self::X|named();
 static method main() → void {
-  core::print(#C1(){() → self::X} as{Unchecked} core::int);
-  core::print(#C2(){() → self::X} as{Unchecked} core::int);
+  core::print(#C1(){() → self::X /* = core::int */} as{Unchecked} core::int);
+  core::print(#C2(){() → self::X /* = core::int */} as{Unchecked} core::int);
 }
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.strong.expect
index 9b10b668208..c012eb634bb 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.strong.expect
@@ -14,21 +14,21 @@ extension type Id(core::int id) {
   constructor • = self::Id|;
   tearoff • = self::Id|_#new#tearOff;
 }
-static inline-class-member method Id|(dynamic id) → self::Id {
-  lowered final self::Id #this = id;
+static inline-class-member method Id|(dynamic id) → self::Id /* = core::int */ {
+  lowered final self::Id /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method Id|_#new#tearOff(dynamic id) → self::Id
+static inline-class-member method Id|_#new#tearOff(dynamic id) → self::Id /* = core::int */
   return self::Id|(id);
 static method test() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   core::print(invalid-expression "pkg/front_end/testcases/inline_class/extension_types/issue52284.dart:9:11: Error: The getter 'unresolved' isn't defined for the class 'Id'.
 Try correcting the name to the name of an existing getter, or defining a getter or field named 'unresolved'.
   print(c.unresolved); // Error
           ^^^^^^^^^^" in c{<unresolved>}.unresolved);
 }
 static method main() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   self::expect(#C1, c.{core::Object::runtimeType}{core::Type});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.strong.transformed.expect
index 9b10b668208..c012eb634bb 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.strong.transformed.expect
@@ -14,21 +14,21 @@ extension type Id(core::int id) {
   constructor • = self::Id|;
   tearoff • = self::Id|_#new#tearOff;
 }
-static inline-class-member method Id|(dynamic id) → self::Id {
-  lowered final self::Id #this = id;
+static inline-class-member method Id|(dynamic id) → self::Id /* = core::int */ {
+  lowered final self::Id /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method Id|_#new#tearOff(dynamic id) → self::Id
+static inline-class-member method Id|_#new#tearOff(dynamic id) → self::Id /* = core::int */
   return self::Id|(id);
 static method test() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   core::print(invalid-expression "pkg/front_end/testcases/inline_class/extension_types/issue52284.dart:9:11: Error: The getter 'unresolved' isn't defined for the class 'Id'.
 Try correcting the name to the name of an existing getter, or defining a getter or field named 'unresolved'.
   print(c.unresolved); // Error
           ^^^^^^^^^^" in c{<unresolved>}.unresolved);
 }
 static method main() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   self::expect(#C1, c.{core::Object::runtimeType}{core::Type});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.weak.expect
index 820bdbb4085..1b1a25be196 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.weak.expect
@@ -14,21 +14,21 @@ extension type Id(core::int id) {
   constructor • = self::Id|;
   tearoff • = self::Id|_#new#tearOff;
 }
-static inline-class-member method Id|(dynamic id) → self::Id {
-  lowered final self::Id #this = id;
+static inline-class-member method Id|(dynamic id) → self::Id /* = core::int */ {
+  lowered final self::Id /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method Id|_#new#tearOff(dynamic id) → self::Id
+static inline-class-member method Id|_#new#tearOff(dynamic id) → self::Id /* = core::int */
   return self::Id|(id);
 static method test() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   core::print(invalid-expression "pkg/front_end/testcases/inline_class/extension_types/issue52284.dart:9:11: Error: The getter 'unresolved' isn't defined for the class 'Id'.
 Try correcting the name to the name of an existing getter, or defining a getter or field named 'unresolved'.
   print(c.unresolved); // Error
           ^^^^^^^^^^" in c{<unresolved>}.unresolved);
 }
 static method main() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   self::expect(#C1, c.{core::Object::runtimeType}{core::Type});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.weak.modular.expect
index 820bdbb4085..1b1a25be196 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.weak.modular.expect
@@ -14,21 +14,21 @@ extension type Id(core::int id) {
   constructor • = self::Id|;
   tearoff • = self::Id|_#new#tearOff;
 }
-static inline-class-member method Id|(dynamic id) → self::Id {
-  lowered final self::Id #this = id;
+static inline-class-member method Id|(dynamic id) → self::Id /* = core::int */ {
+  lowered final self::Id /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method Id|_#new#tearOff(dynamic id) → self::Id
+static inline-class-member method Id|_#new#tearOff(dynamic id) → self::Id /* = core::int */
   return self::Id|(id);
 static method test() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   core::print(invalid-expression "pkg/front_end/testcases/inline_class/extension_types/issue52284.dart:9:11: Error: The getter 'unresolved' isn't defined for the class 'Id'.
 Try correcting the name to the name of an existing getter, or defining a getter or field named 'unresolved'.
   print(c.unresolved); // Error
           ^^^^^^^^^^" in c{<unresolved>}.unresolved);
 }
 static method main() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   self::expect(#C1, c.{core::Object::runtimeType}{core::Type});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.weak.outline.expect
index 05b91400ee8..d62cbf2038b 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.weak.outline.expect
@@ -6,9 +6,9 @@ extension type Id(core::int id) {
   constructor • = self::Id|;
   tearoff • = self::Id|_#new#tearOff;
 }
-static inline-class-member method Id|(dynamic id) → self::Id
+static inline-class-member method Id|(dynamic id) → self::Id /* = core::int */
   ;
-static inline-class-member method Id|_#new#tearOff(dynamic id) → self::Id
+static inline-class-member method Id|_#new#tearOff(dynamic id) → self::Id /* = core::int */
   return self::Id|(id);
 static method test() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.weak.transformed.expect
index 820bdbb4085..1b1a25be196 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52284.dart.weak.transformed.expect
@@ -14,21 +14,21 @@ extension type Id(core::int id) {
   constructor • = self::Id|;
   tearoff • = self::Id|_#new#tearOff;
 }
-static inline-class-member method Id|(dynamic id) → self::Id {
-  lowered final self::Id #this = id;
+static inline-class-member method Id|(dynamic id) → self::Id /* = core::int */ {
+  lowered final self::Id /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method Id|_#new#tearOff(dynamic id) → self::Id
+static inline-class-member method Id|_#new#tearOff(dynamic id) → self::Id /* = core::int */
   return self::Id|(id);
 static method test() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   core::print(invalid-expression "pkg/front_end/testcases/inline_class/extension_types/issue52284.dart:9:11: Error: The getter 'unresolved' isn't defined for the class 'Id'.
 Try correcting the name to the name of an existing getter, or defining a getter or field named 'unresolved'.
   print(c.unresolved); // Error
           ^^^^^^^^^^" in c{<unresolved>}.unresolved);
 }
 static method main() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   self::expect(#C1, c.{core::Object::runtimeType}{core::Type});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.strong.expect
index 44ff176e16e..6fce022f160 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.strong.expect
@@ -8,17 +8,17 @@ extension type IC1(core::int id) {
   static redirecting-factory f = self::IC1|f;
   static tearoff f = self::IC1|_#f#tearOff;
 }
-static inline-class-member method IC1|(dynamic id) → self::IC1 {
-  lowered final self::IC1 #this = id;
+static inline-class-member method IC1|(dynamic id) → self::IC1 /* = core::int */ {
+  lowered final self::IC1 /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method IC1|_#new#tearOff(dynamic id) → self::IC1
+static inline-class-member method IC1|_#new#tearOff(dynamic id) → self::IC1 /* = core::int */
   return self::IC1|(id);
-static inline-class-member method IC1|f(core::int id) → self::IC1 /* redirection-target: self::IC1| */
+static inline-class-member method IC1|f(core::int id) → self::IC1 /* = core::int */ /* redirection-target: self::IC1| */
   return self::IC1|(id);
-static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1
+static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1 /* = core::int */
   return self::IC1|(id);
 static method main() → dynamic {
-  self::IC1 ic1 = self::IC1|(1);
+  self::IC1 /* = core::int */ ic1 = self::IC1|(1);
   core::print(ic1 as{Unchecked} core::int);
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.strong.transformed.expect
index 44ff176e16e..6fce022f160 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.strong.transformed.expect
@@ -8,17 +8,17 @@ extension type IC1(core::int id) {
   static redirecting-factory f = self::IC1|f;
   static tearoff f = self::IC1|_#f#tearOff;
 }
-static inline-class-member method IC1|(dynamic id) → self::IC1 {
-  lowered final self::IC1 #this = id;
+static inline-class-member method IC1|(dynamic id) → self::IC1 /* = core::int */ {
+  lowered final self::IC1 /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method IC1|_#new#tearOff(dynamic id) → self::IC1
+static inline-class-member method IC1|_#new#tearOff(dynamic id) → self::IC1 /* = core::int */
   return self::IC1|(id);
-static inline-class-member method IC1|f(core::int id) → self::IC1 /* redirection-target: self::IC1| */
+static inline-class-member method IC1|f(core::int id) → self::IC1 /* = core::int */ /* redirection-target: self::IC1| */
   return self::IC1|(id);
-static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1
+static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1 /* = core::int */
   return self::IC1|(id);
 static method main() → dynamic {
-  self::IC1 ic1 = self::IC1|(1);
+  self::IC1 /* = core::int */ ic1 = self::IC1|(1);
   core::print(ic1 as{Unchecked} core::int);
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.weak.expect
index 44ff176e16e..6fce022f160 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.weak.expect
@@ -8,17 +8,17 @@ extension type IC1(core::int id) {
   static redirecting-factory f = self::IC1|f;
   static tearoff f = self::IC1|_#f#tearOff;
 }
-static inline-class-member method IC1|(dynamic id) → self::IC1 {
-  lowered final self::IC1 #this = id;
+static inline-class-member method IC1|(dynamic id) → self::IC1 /* = core::int */ {
+  lowered final self::IC1 /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method IC1|_#new#tearOff(dynamic id) → self::IC1
+static inline-class-member method IC1|_#new#tearOff(dynamic id) → self::IC1 /* = core::int */
   return self::IC1|(id);
-static inline-class-member method IC1|f(core::int id) → self::IC1 /* redirection-target: self::IC1| */
+static inline-class-member method IC1|f(core::int id) → self::IC1 /* = core::int */ /* redirection-target: self::IC1| */
   return self::IC1|(id);
-static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1
+static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1 /* = core::int */
   return self::IC1|(id);
 static method main() → dynamic {
-  self::IC1 ic1 = self::IC1|(1);
+  self::IC1 /* = core::int */ ic1 = self::IC1|(1);
   core::print(ic1 as{Unchecked} core::int);
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.weak.modular.expect
index 44ff176e16e..6fce022f160 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.weak.modular.expect
@@ -8,17 +8,17 @@ extension type IC1(core::int id) {
   static redirecting-factory f = self::IC1|f;
   static tearoff f = self::IC1|_#f#tearOff;
 }
-static inline-class-member method IC1|(dynamic id) → self::IC1 {
-  lowered final self::IC1 #this = id;
+static inline-class-member method IC1|(dynamic id) → self::IC1 /* = core::int */ {
+  lowered final self::IC1 /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method IC1|_#new#tearOff(dynamic id) → self::IC1
+static inline-class-member method IC1|_#new#tearOff(dynamic id) → self::IC1 /* = core::int */
   return self::IC1|(id);
-static inline-class-member method IC1|f(core::int id) → self::IC1 /* redirection-target: self::IC1| */
+static inline-class-member method IC1|f(core::int id) → self::IC1 /* = core::int */ /* redirection-target: self::IC1| */
   return self::IC1|(id);
-static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1
+static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1 /* = core::int */
   return self::IC1|(id);
 static method main() → dynamic {
-  self::IC1 ic1 = self::IC1|(1);
+  self::IC1 /* = core::int */ ic1 = self::IC1|(1);
   core::print(ic1 as{Unchecked} core::int);
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.weak.outline.expect
index 8b89304cba5..e831b519095 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.weak.outline.expect
@@ -8,13 +8,13 @@ extension type IC1(core::int id) {
   static redirecting-factory f = self::IC1|f;
   static tearoff f = self::IC1|_#f#tearOff;
 }
-static inline-class-member method IC1|(dynamic id) → self::IC1
+static inline-class-member method IC1|(dynamic id) → self::IC1 /* = core::int */
   ;
-static inline-class-member method IC1|_#new#tearOff(dynamic id) → self::IC1
+static inline-class-member method IC1|_#new#tearOff(dynamic id) → self::IC1 /* = core::int */
   return self::IC1|(id);
-static inline-class-member method IC1|f(core::int id) → self::IC1 /* redirection-target: self::IC1| */
+static inline-class-member method IC1|f(core::int id) → self::IC1 /* = core::int */ /* redirection-target: self::IC1| */
   return self::IC1|(id);
-static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1
+static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1 /* = core::int */
   return self::IC1|(id);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.weak.transformed.expect
index 44ff176e16e..6fce022f160 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52525.dart.weak.transformed.expect
@@ -8,17 +8,17 @@ extension type IC1(core::int id) {
   static redirecting-factory f = self::IC1|f;
   static tearoff f = self::IC1|_#f#tearOff;
 }
-static inline-class-member method IC1|(dynamic id) → self::IC1 {
-  lowered final self::IC1 #this = id;
+static inline-class-member method IC1|(dynamic id) → self::IC1 /* = core::int */ {
+  lowered final self::IC1 /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method IC1|_#new#tearOff(dynamic id) → self::IC1
+static inline-class-member method IC1|_#new#tearOff(dynamic id) → self::IC1 /* = core::int */
   return self::IC1|(id);
-static inline-class-member method IC1|f(core::int id) → self::IC1 /* redirection-target: self::IC1| */
+static inline-class-member method IC1|f(core::int id) → self::IC1 /* = core::int */ /* redirection-target: self::IC1| */
   return self::IC1|(id);
-static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1
+static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1 /* = core::int */
   return self::IC1|(id);
 static method main() → dynamic {
-  self::IC1 ic1 = self::IC1|(1);
+  self::IC1 /* = core::int */ ic1 = self::IC1|(1);
   core::print(ic1 as{Unchecked} core::int);
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.strong.expect
index 5198fa70e0b..2c461c570e3 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.strong.expect
@@ -15,23 +15,23 @@ extension type FooBaz(core::int i) implements self::Foo {
   constructor • = self::FooBaz|;
   tearoff • = self::FooBaz|_#new#tearOff;
 }
-static inline-class-member method FooBar|(dynamic i) → self::FooBar {
-  lowered final self::FooBar #this = i;
+static inline-class-member method FooBar|(dynamic i) → self::FooBar /* = core::int */ {
+  lowered final self::FooBar /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBar|_#new#tearOff(dynamic i) → self::FooBar
+static inline-class-member method FooBar|_#new#tearOff(dynamic i) → self::FooBar /* = core::int */
   return self::FooBar|(i);
-static inline-class-member method FooBaz|(dynamic i) → self::FooBaz {
-  lowered final self::FooBaz #this = i;
+static inline-class-member method FooBaz|(dynamic i) → self::FooBaz /* = core::int */ {
+  lowered final self::FooBaz /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBaz|_#new#tearOff(dynamic i) → self::FooBaz
+static inline-class-member method FooBaz|_#new#tearOff(dynamic i) → self::FooBaz /* = core::int */
   return self::FooBaz|(i);
 static method main() → void {
-  final self::FooBar a = self::FooBar|(0);
+  final self::FooBar /* = core::int */ a = self::FooBar|(0);
   #L1:
   {
-    final synthesized self::FooBar #0#0 = a;
+    final synthesized self::FooBar /* = core::int */ #0#0 = a;
     {
       final hoisted core::int a;
       if(let final dynamic #t1 = a = #0#0 as{Unchecked} core::int in true) {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.strong.transformed.expect
index db3ad03a9fc..ba73a59b67f 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.strong.transformed.expect
@@ -15,23 +15,23 @@ extension type FooBaz(core::int i) implements self::Foo {
   constructor • = self::FooBaz|;
   tearoff • = self::FooBaz|_#new#tearOff;
 }
-static inline-class-member method FooBar|(dynamic i) → self::FooBar {
-  lowered final self::FooBar #this = i;
+static inline-class-member method FooBar|(dynamic i) → self::FooBar /* = core::int */ {
+  lowered final self::FooBar /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBar|_#new#tearOff(dynamic i) → self::FooBar
+static inline-class-member method FooBar|_#new#tearOff(dynamic i) → self::FooBar /* = core::int */
   return self::FooBar|(i);
-static inline-class-member method FooBaz|(dynamic i) → self::FooBaz {
-  lowered final self::FooBaz #this = i;
+static inline-class-member method FooBaz|(dynamic i) → self::FooBaz /* = core::int */ {
+  lowered final self::FooBaz /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBaz|_#new#tearOff(dynamic i) → self::FooBaz
+static inline-class-member method FooBaz|_#new#tearOff(dynamic i) → self::FooBaz /* = core::int */
   return self::FooBaz|(i);
 static method main() → void {
-  final self::FooBar a = self::FooBar|(0);
+  final self::FooBar /* = core::int */ a = self::FooBar|(0);
   #L1:
   {
-    final synthesized self::FooBar #0#0 = a;
+    final synthesized self::FooBar /* = core::int */ #0#0 = a;
     {
       final hoisted core::int a;
       if(let final core::int #t1 = a = #0#0 as{Unchecked} core::int in true) {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.weak.expect
index 5198fa70e0b..2c461c570e3 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.weak.expect
@@ -15,23 +15,23 @@ extension type FooBaz(core::int i) implements self::Foo {
   constructor • = self::FooBaz|;
   tearoff • = self::FooBaz|_#new#tearOff;
 }
-static inline-class-member method FooBar|(dynamic i) → self::FooBar {
-  lowered final self::FooBar #this = i;
+static inline-class-member method FooBar|(dynamic i) → self::FooBar /* = core::int */ {
+  lowered final self::FooBar /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBar|_#new#tearOff(dynamic i) → self::FooBar
+static inline-class-member method FooBar|_#new#tearOff(dynamic i) → self::FooBar /* = core::int */
   return self::FooBar|(i);
-static inline-class-member method FooBaz|(dynamic i) → self::FooBaz {
-  lowered final self::FooBaz #this = i;
+static inline-class-member method FooBaz|(dynamic i) → self::FooBaz /* = core::int */ {
+  lowered final self::FooBaz /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBaz|_#new#tearOff(dynamic i) → self::FooBaz
+static inline-class-member method FooBaz|_#new#tearOff(dynamic i) → self::FooBaz /* = core::int */
   return self::FooBaz|(i);
 static method main() → void {
-  final self::FooBar a = self::FooBar|(0);
+  final self::FooBar /* = core::int */ a = self::FooBar|(0);
   #L1:
   {
-    final synthesized self::FooBar #0#0 = a;
+    final synthesized self::FooBar /* = core::int */ #0#0 = a;
     {
       final hoisted core::int a;
       if(let final dynamic #t1 = a = #0#0 as{Unchecked} core::int in true) {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.weak.modular.expect
index 5198fa70e0b..2c461c570e3 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.weak.modular.expect
@@ -15,23 +15,23 @@ extension type FooBaz(core::int i) implements self::Foo {
   constructor • = self::FooBaz|;
   tearoff • = self::FooBaz|_#new#tearOff;
 }
-static inline-class-member method FooBar|(dynamic i) → self::FooBar {
-  lowered final self::FooBar #this = i;
+static inline-class-member method FooBar|(dynamic i) → self::FooBar /* = core::int */ {
+  lowered final self::FooBar /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBar|_#new#tearOff(dynamic i) → self::FooBar
+static inline-class-member method FooBar|_#new#tearOff(dynamic i) → self::FooBar /* = core::int */
   return self::FooBar|(i);
-static inline-class-member method FooBaz|(dynamic i) → self::FooBaz {
-  lowered final self::FooBaz #this = i;
+static inline-class-member method FooBaz|(dynamic i) → self::FooBaz /* = core::int */ {
+  lowered final self::FooBaz /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBaz|_#new#tearOff(dynamic i) → self::FooBaz
+static inline-class-member method FooBaz|_#new#tearOff(dynamic i) → self::FooBaz /* = core::int */
   return self::FooBaz|(i);
 static method main() → void {
-  final self::FooBar a = self::FooBar|(0);
+  final self::FooBar /* = core::int */ a = self::FooBar|(0);
   #L1:
   {
-    final synthesized self::FooBar #0#0 = a;
+    final synthesized self::FooBar /* = core::int */ #0#0 = a;
     {
       final hoisted core::int a;
       if(let final dynamic #t1 = a = #0#0 as{Unchecked} core::int in true) {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.weak.outline.expect
index 3baba1808f3..1ccf2a1ee98 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.weak.outline.expect
@@ -14,13 +14,13 @@ extension type FooBaz(core::int i) implements self::Foo {
   constructor • = self::FooBaz|;
   tearoff • = self::FooBaz|_#new#tearOff;
 }
-static inline-class-member method FooBar|(dynamic i) → self::FooBar
+static inline-class-member method FooBar|(dynamic i) → self::FooBar /* = core::int */
   ;
-static inline-class-member method FooBar|_#new#tearOff(dynamic i) → self::FooBar
+static inline-class-member method FooBar|_#new#tearOff(dynamic i) → self::FooBar /* = core::int */
   return self::FooBar|(i);
-static inline-class-member method FooBaz|(dynamic i) → self::FooBaz
+static inline-class-member method FooBaz|(dynamic i) → self::FooBaz /* = core::int */
   ;
-static inline-class-member method FooBaz|_#new#tearOff(dynamic i) → self::FooBaz
+static inline-class-member method FooBaz|_#new#tearOff(dynamic i) → self::FooBaz /* = core::int */
   return self::FooBaz|(i);
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.weak.transformed.expect
index db3ad03a9fc..ba73a59b67f 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue52667.dart.weak.transformed.expect
@@ -15,23 +15,23 @@ extension type FooBaz(core::int i) implements self::Foo {
   constructor • = self::FooBaz|;
   tearoff • = self::FooBaz|_#new#tearOff;
 }
-static inline-class-member method FooBar|(dynamic i) → self::FooBar {
-  lowered final self::FooBar #this = i;
+static inline-class-member method FooBar|(dynamic i) → self::FooBar /* = core::int */ {
+  lowered final self::FooBar /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBar|_#new#tearOff(dynamic i) → self::FooBar
+static inline-class-member method FooBar|_#new#tearOff(dynamic i) → self::FooBar /* = core::int */
   return self::FooBar|(i);
-static inline-class-member method FooBaz|(dynamic i) → self::FooBaz {
-  lowered final self::FooBaz #this = i;
+static inline-class-member method FooBaz|(dynamic i) → self::FooBaz /* = core::int */ {
+  lowered final self::FooBaz /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBaz|_#new#tearOff(dynamic i) → self::FooBaz
+static inline-class-member method FooBaz|_#new#tearOff(dynamic i) → self::FooBaz /* = core::int */
   return self::FooBaz|(i);
 static method main() → void {
-  final self::FooBar a = self::FooBar|(0);
+  final self::FooBar /* = core::int */ a = self::FooBar|(0);
   #L1:
   {
-    final synthesized self::FooBar #0#0 = a;
+    final synthesized self::FooBar /* = core::int */ #0#0 = a;
     {
       final hoisted core::int a;
       if(let final core::int #t1 = a = #0#0 as{Unchecked} core::int in true) {
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.strong.expect
index d01f4feceed..e7025bd8c3d 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.strong.expect
@@ -21,16 +21,16 @@ library;
 import self as self;
 import "dart:core" as core;
 
-extension type V<T extends self::V<T> = self::V<dynamic>>(T id) {
+extension type V<T extends self::V<T> /* = T */ = self::V<dynamic> /* = dynamic */>(T id) {
   constructor • = self::V|;
   tearoff • = self::V|_#new#tearOff;
 }
-static inline-class-member method V|<T extends self::V<self::V|::T> = dynamic>(dynamic id) → self::V<self::V|::T> {
-  lowered final self::V<self::V|::T> #this = id;
+static inline-class-member method V|<T extends self::V<self::V|::T> /* = self::V|::T */ = dynamic>(dynamic id) → self::V<self::V|::T> /* = self::V|::T */ {
+  lowered final self::V<self::V|::T> /* = self::V|::T */ #this = id;
   return #this;
 }
-static inline-class-member method V|_#new#tearOff<T extends self::V<self::V|_#new#tearOff::T> = dynamic>(dynamic id) → self::V<self::V|_#new#tearOff::T>
+static inline-class-member method V|_#new#tearOff<T extends self::V<self::V|_#new#tearOff::T> /* = self::V|_#new#tearOff::T */ = dynamic>(dynamic id) → self::V<self::V|_#new#tearOff::T> /* = self::V|_#new#tearOff::T */
   return self::V|<self::V|_#new#tearOff::T>(id);
-static method test(self::V<self::V<dynamic>> v) → dynamic {
-  core::List<self::V<self::V<dynamic>>> l = <self::V<self::V<dynamic>>>[v];
+static method test(self::V<self::V<dynamic> /* = dynamic */> /* = dynamic */ v) → dynamic {
+  core::List<self::V<self::V<dynamic> /* = dynamic */> /* = dynamic */> l = <self::V<self::V<dynamic> /* = dynamic */> /* = dynamic */>[v];
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.strong.transformed.expect
index 759e27ab49c..358ff346d35 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.strong.transformed.expect
@@ -21,16 +21,16 @@ library;
 import self as self;
 import "dart:core" as core;
 
-extension type V<T extends self::V<T> = self::V<dynamic>>(T id) {
+extension type V<T extends self::V<T> /* = T */ = self::V<dynamic> /* = dynamic */>(T id) {
   constructor • = self::V|;
   tearoff • = self::V|_#new#tearOff;
 }
-static inline-class-member method V|<T extends self::V<self::V|::T> = dynamic>(dynamic id) → self::V<self::V|::T> {
-  lowered final self::V<self::V|::T> #this = id;
+static inline-class-member method V|<T extends self::V<self::V|::T> /* = self::V|::T */ = dynamic>(dynamic id) → self::V<self::V|::T> /* = self::V|::T */ {
+  lowered final self::V<self::V|::T> /* = self::V|::T */ #this = id;
   return #this;
 }
-static inline-class-member method V|_#new#tearOff<T extends self::V<self::V|_#new#tearOff::T> = dynamic>(dynamic id) → self::V<self::V|_#new#tearOff::T>
+static inline-class-member method V|_#new#tearOff<T extends self::V<self::V|_#new#tearOff::T> /* = self::V|_#new#tearOff::T */ = dynamic>(dynamic id) → self::V<self::V|_#new#tearOff::T> /* = self::V|_#new#tearOff::T */
   return self::V|<self::V|_#new#tearOff::T>(id);
-static method test(self::V<self::V<dynamic>> v) → dynamic {
-  core::List<self::V<self::V<dynamic>>> l = core::_GrowableList::_literal1<self::V<self::V<dynamic>>>(v);
+static method test(self::V<self::V<dynamic> /* = dynamic */> /* = dynamic */ v) → dynamic {
+  core::List<self::V<self::V<dynamic> /* = dynamic */> /* = dynamic */> l = core::_GrowableList::_literal1<self::V<self::V<dynamic> /* = dynamic */> /* = dynamic */>(v);
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.weak.expect
index d01f4feceed..e7025bd8c3d 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.weak.expect
@@ -21,16 +21,16 @@ library;
 import self as self;
 import "dart:core" as core;
 
-extension type V<T extends self::V<T> = self::V<dynamic>>(T id) {
+extension type V<T extends self::V<T> /* = T */ = self::V<dynamic> /* = dynamic */>(T id) {
   constructor • = self::V|;
   tearoff • = self::V|_#new#tearOff;
 }
-static inline-class-member method V|<T extends self::V<self::V|::T> = dynamic>(dynamic id) → self::V<self::V|::T> {
-  lowered final self::V<self::V|::T> #this = id;
+static inline-class-member method V|<T extends self::V<self::V|::T> /* = self::V|::T */ = dynamic>(dynamic id) → self::V<self::V|::T> /* = self::V|::T */ {
+  lowered final self::V<self::V|::T> /* = self::V|::T */ #this = id;
   return #this;
 }
-static inline-class-member method V|_#new#tearOff<T extends self::V<self::V|_#new#tearOff::T> = dynamic>(dynamic id) → self::V<self::V|_#new#tearOff::T>
+static inline-class-member method V|_#new#tearOff<T extends self::V<self::V|_#new#tearOff::T> /* = self::V|_#new#tearOff::T */ = dynamic>(dynamic id) → self::V<self::V|_#new#tearOff::T> /* = self::V|_#new#tearOff::T */
   return self::V|<self::V|_#new#tearOff::T>(id);
-static method test(self::V<self::V<dynamic>> v) → dynamic {
-  core::List<self::V<self::V<dynamic>>> l = <self::V<self::V<dynamic>>>[v];
+static method test(self::V<self::V<dynamic> /* = dynamic */> /* = dynamic */ v) → dynamic {
+  core::List<self::V<self::V<dynamic> /* = dynamic */> /* = dynamic */> l = <self::V<self::V<dynamic> /* = dynamic */> /* = dynamic */>[v];
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.weak.modular.expect
index d01f4feceed..e7025bd8c3d 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.weak.modular.expect
@@ -21,16 +21,16 @@ library;
 import self as self;
 import "dart:core" as core;
 
-extension type V<T extends self::V<T> = self::V<dynamic>>(T id) {
+extension type V<T extends self::V<T> /* = T */ = self::V<dynamic> /* = dynamic */>(T id) {
   constructor • = self::V|;
   tearoff • = self::V|_#new#tearOff;
 }
-static inline-class-member method V|<T extends self::V<self::V|::T> = dynamic>(dynamic id) → self::V<self::V|::T> {
-  lowered final self::V<self::V|::T> #this = id;
+static inline-class-member method V|<T extends self::V<self::V|::T> /* = self::V|::T */ = dynamic>(dynamic id) → self::V<self::V|::T> /* = self::V|::T */ {
+  lowered final self::V<self::V|::T> /* = self::V|::T */ #this = id;
   return #this;
 }
-static inline-class-member method V|_#new#tearOff<T extends self::V<self::V|_#new#tearOff::T> = dynamic>(dynamic id) → self::V<self::V|_#new#tearOff::T>
+static inline-class-member method V|_#new#tearOff<T extends self::V<self::V|_#new#tearOff::T> /* = self::V|_#new#tearOff::T */ = dynamic>(dynamic id) → self::V<self::V|_#new#tearOff::T> /* = self::V|_#new#tearOff::T */
   return self::V|<self::V|_#new#tearOff::T>(id);
-static method test(self::V<self::V<dynamic>> v) → dynamic {
-  core::List<self::V<self::V<dynamic>>> l = <self::V<self::V<dynamic>>>[v];
+static method test(self::V<self::V<dynamic> /* = dynamic */> /* = dynamic */ v) → dynamic {
+  core::List<self::V<self::V<dynamic> /* = dynamic */> /* = dynamic */> l = <self::V<self::V<dynamic> /* = dynamic */> /* = dynamic */>[v];
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.weak.outline.expect
index 54cce6d8d9a..1758c31f14a 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.weak.outline.expect
@@ -12,13 +12,13 @@ library;
 //
 import self as self;
 
-extension type V<T extends self::V<T> = self::V<dynamic>>(T id) {
+extension type V<T extends self::V<T> /* = T */ = self::V<dynamic> /* = dynamic */>(T id) {
   constructor • = self::V|;
   tearoff • = self::V|_#new#tearOff;
 }
-static inline-class-member method V|<T extends self::V<self::V|::T> = dynamic>(dynamic id) → self::V<self::V|::T>
+static inline-class-member method V|<T extends self::V<self::V|::T> /* = self::V|::T */ = dynamic>(dynamic id) → self::V<self::V|::T> /* = self::V|::T */
   ;
-static inline-class-member method V|_#new#tearOff<T extends self::V<self::V|_#new#tearOff::T> = dynamic>(dynamic id) → self::V<self::V|_#new#tearOff::T>
+static inline-class-member method V|_#new#tearOff<T extends self::V<self::V|_#new#tearOff::T> /* = self::V|_#new#tearOff::T */ = dynamic>(dynamic id) → self::V<self::V|_#new#tearOff::T> /* = self::V|_#new#tearOff::T */
   return self::V|<self::V|_#new#tearOff::T>(id);
-static method test(self::V<self::V<dynamic>> v) → dynamic
+static method test(self::V<self::V<dynamic> /* = dynamic */> /* = dynamic */ v) → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.weak.transformed.expect
index 759e27ab49c..358ff346d35 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/issue53123.dart.weak.transformed.expect
@@ -21,16 +21,16 @@ library;
 import self as self;
 import "dart:core" as core;
 
-extension type V<T extends self::V<T> = self::V<dynamic>>(T id) {
+extension type V<T extends self::V<T> /* = T */ = self::V<dynamic> /* = dynamic */>(T id) {
   constructor • = self::V|;
   tearoff • = self::V|_#new#tearOff;
 }
-static inline-class-member method V|<T extends self::V<self::V|::T> = dynamic>(dynamic id) → self::V<self::V|::T> {
-  lowered final self::V<self::V|::T> #this = id;
+static inline-class-member method V|<T extends self::V<self::V|::T> /* = self::V|::T */ = dynamic>(dynamic id) → self::V<self::V|::T> /* = self::V|::T */ {
+  lowered final self::V<self::V|::T> /* = self::V|::T */ #this = id;
   return #this;
 }
-static inline-class-member method V|_#new#tearOff<T extends self::V<self::V|_#new#tearOff::T> = dynamic>(dynamic id) → self::V<self::V|_#new#tearOff::T>
+static inline-class-member method V|_#new#tearOff<T extends self::V<self::V|_#new#tearOff::T> /* = self::V|_#new#tearOff::T */ = dynamic>(dynamic id) → self::V<self::V|_#new#tearOff::T> /* = self::V|_#new#tearOff::T */
   return self::V|<self::V|_#new#tearOff::T>(id);
-static method test(self::V<self::V<dynamic>> v) → dynamic {
-  core::List<self::V<self::V<dynamic>>> l = core::_GrowableList::_literal1<self::V<self::V<dynamic>>>(v);
+static method test(self::V<self::V<dynamic> /* = dynamic */> /* = dynamic */ v) → dynamic {
+  core::List<self::V<self::V<dynamic> /* = dynamic */> /* = dynamic */> l = core::_GrowableList::_literal1<self::V<self::V<dynamic> /* = dynamic */> /* = dynamic */>(v);
 }
diff --git a/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.strong.expect
index 3e22338472d..e905037bc71 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.strong.expect
@@ -15,17 +15,17 @@ extension type A(core::int value) {
   constructor name1 = self::A|name1;
   tearoff name1 = self::A|_#name1#tearOff;
 }
-static inline-class-member method A|_(dynamic value) → self::A {
-  lowered final self::A #this = value;
+static inline-class-member method A|_(dynamic value) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = value;
   return #this;
 }
-static inline-class-member method A|_#_#tearOff(dynamic value) → self::A
+static inline-class-member method A|_#_#tearOff(dynamic value) → self::A /* = core::int */
   return self::A|_(value);
-static inline-class-member method A|name1(core::int value) → self::A {
-  lowered final self::A #this = value;
+static inline-class-member method A|name1(core::int value) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = value;
   return #this;
 }
-static inline-class-member method A|_#name1#tearOff(core::int value) → self::A
+static inline-class-member method A|_#name1#tearOff(core::int value) → self::A /* = core::int */
   return self::A|name1(value);
 static method method() → void
   return invalid-expression "pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart:9:20: Error: Member not found: 'A.name2'.
diff --git a/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.strong.transformed.expect
index 3e22338472d..e905037bc71 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.strong.transformed.expect
@@ -15,17 +15,17 @@ extension type A(core::int value) {
   constructor name1 = self::A|name1;
   tearoff name1 = self::A|_#name1#tearOff;
 }
-static inline-class-member method A|_(dynamic value) → self::A {
-  lowered final self::A #this = value;
+static inline-class-member method A|_(dynamic value) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = value;
   return #this;
 }
-static inline-class-member method A|_#_#tearOff(dynamic value) → self::A
+static inline-class-member method A|_#_#tearOff(dynamic value) → self::A /* = core::int */
   return self::A|_(value);
-static inline-class-member method A|name1(core::int value) → self::A {
-  lowered final self::A #this = value;
+static inline-class-member method A|name1(core::int value) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = value;
   return #this;
 }
-static inline-class-member method A|_#name1#tearOff(core::int value) → self::A
+static inline-class-member method A|_#name1#tearOff(core::int value) → self::A /* = core::int */
   return self::A|name1(value);
 static method method() → void
   return invalid-expression "pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart:9:20: Error: Member not found: 'A.name2'.
diff --git a/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.weak.expect
index 3e22338472d..e905037bc71 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.weak.expect
@@ -15,17 +15,17 @@ extension type A(core::int value) {
   constructor name1 = self::A|name1;
   tearoff name1 = self::A|_#name1#tearOff;
 }
-static inline-class-member method A|_(dynamic value) → self::A {
-  lowered final self::A #this = value;
+static inline-class-member method A|_(dynamic value) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = value;
   return #this;
 }
-static inline-class-member method A|_#_#tearOff(dynamic value) → self::A
+static inline-class-member method A|_#_#tearOff(dynamic value) → self::A /* = core::int */
   return self::A|_(value);
-static inline-class-member method A|name1(core::int value) → self::A {
-  lowered final self::A #this = value;
+static inline-class-member method A|name1(core::int value) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = value;
   return #this;
 }
-static inline-class-member method A|_#name1#tearOff(core::int value) → self::A
+static inline-class-member method A|_#name1#tearOff(core::int value) → self::A /* = core::int */
   return self::A|name1(value);
 static method method() → void
   return invalid-expression "pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart:9:20: Error: Member not found: 'A.name2'.
diff --git a/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.weak.modular.expect
index 3e22338472d..e905037bc71 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.weak.modular.expect
@@ -15,17 +15,17 @@ extension type A(core::int value) {
   constructor name1 = self::A|name1;
   tearoff name1 = self::A|_#name1#tearOff;
 }
-static inline-class-member method A|_(dynamic value) → self::A {
-  lowered final self::A #this = value;
+static inline-class-member method A|_(dynamic value) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = value;
   return #this;
 }
-static inline-class-member method A|_#_#tearOff(dynamic value) → self::A
+static inline-class-member method A|_#_#tearOff(dynamic value) → self::A /* = core::int */
   return self::A|_(value);
-static inline-class-member method A|name1(core::int value) → self::A {
-  lowered final self::A #this = value;
+static inline-class-member method A|name1(core::int value) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = value;
   return #this;
 }
-static inline-class-member method A|_#name1#tearOff(core::int value) → self::A
+static inline-class-member method A|_#name1#tearOff(core::int value) → self::A /* = core::int */
   return self::A|name1(value);
 static method method() → void
   return invalid-expression "pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart:9:20: Error: Member not found: 'A.name2'.
diff --git a/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.weak.outline.expect
index 295adb9dce9..f9c5fe2f14d 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.weak.outline.expect
@@ -8,13 +8,13 @@ extension type A(core::int value) {
   constructor name1 = self::A|name1;
   tearoff name1 = self::A|_#name1#tearOff;
 }
-static inline-class-member method A|_(dynamic value) → self::A
+static inline-class-member method A|_(dynamic value) → self::A /* = core::int */
   ;
-static inline-class-member method A|_#_#tearOff(dynamic value) → self::A
+static inline-class-member method A|_#_#tearOff(dynamic value) → self::A /* = core::int */
   return self::A|_(value);
-static inline-class-member method A|name1(core::int value) → self::A
+static inline-class-member method A|name1(core::int value) → self::A /* = core::int */
   ;
-static inline-class-member method A|_#name1#tearOff(core::int value) → self::A
+static inline-class-member method A|_#name1#tearOff(core::int value) → self::A /* = core::int */
   return self::A|name1(value);
 static method method() → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.weak.transformed.expect
index 3e22338472d..e905037bc71 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart.weak.transformed.expect
@@ -15,17 +15,17 @@ extension type A(core::int value) {
   constructor name1 = self::A|name1;
   tearoff name1 = self::A|_#name1#tearOff;
 }
-static inline-class-member method A|_(dynamic value) → self::A {
-  lowered final self::A #this = value;
+static inline-class-member method A|_(dynamic value) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = value;
   return #this;
 }
-static inline-class-member method A|_#_#tearOff(dynamic value) → self::A
+static inline-class-member method A|_#_#tearOff(dynamic value) → self::A /* = core::int */
   return self::A|_(value);
-static inline-class-member method A|name1(core::int value) → self::A {
-  lowered final self::A #this = value;
+static inline-class-member method A|name1(core::int value) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = value;
   return #this;
 }
-static inline-class-member method A|_#name1#tearOff(core::int value) → self::A
+static inline-class-member method A|_#name1#tearOff(core::int value) → self::A /* = core::int */
   return self::A|name1(value);
 static method method() → void
   return invalid-expression "pkg/front_end/testcases/inline_class/extension_types/member_not_found.dart:9:20: Error: Member not found: 'A.name2'.
diff --git a/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.strong.expect
index a1f3a151450..91994442759 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.strong.expect
@@ -60,13 +60,13 @@ extension type InlineClass(core::int it) {
 static extension-member method _extension#0|get#setter(lowered final core::Object #this) → core::int
   return 42;
 static extension-member method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
-static inline-class-member method InlineClass|(dynamic it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(dynamic it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → dynamic {
   core::int a = self::InlineClass|+(#this, 2);
   core::int b = self::InlineClass|unary-(#this);
   core::int c = self::InlineClass|[](#this, 2);
@@ -109,35 +109,35 @@ Try correcting the name to the name of an existing setter, or defining a setter
   core::int n1 = self::InlineClass|call(#this);
   core::int n2 = self::InlineClass|call(#this);
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → dynamic
   return () → dynamic => self::InlineClass|test(#this);
-static inline-class-member method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
+static inline-class-member method InlineClass|+(lowered final self::InlineClass /* = core::int */ #this, core::int other) → core::int
   return 42;
-static inline-class-member method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|unary-(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 87;
-static inline-class-member method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
+static inline-class-member method InlineClass|[](lowered final self::InlineClass /* = core::int */ #this, core::int index) → core::int
   return 123;
-static inline-class-member method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
-static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|[]=(lowered final self::InlineClass /* = core::int */ #this, core::int index, core::int value) → void {}
+static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|method(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|method(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#method(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|method(#this);
-static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
-static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
+static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass /* = core::int */ #this, core::int value) → void {}
+static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass /* = core::int */ #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
   return t;
-static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
+static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass /* = core::int */ #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::InlineClass|genericMethod<T%>(#this, t);
-static inline-class-member method InlineClass|call(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|call(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 321;
-static inline-class-member method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#call(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|call(#this);
-static method test(self::InlineClass ic) → dynamic {
+static method test(self::InlineClass /* = core::int */ ic) → dynamic {
   core::int a = self::InlineClass|+(ic, 2);
   core::int b = self::InlineClass|unary-(ic);
   core::int c = self::InlineClass|[](ic, 2);
-  core::int d = let final self::InlineClass #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
+  core::int d = let final self::InlineClass /* = core::int */ #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
   core::int e = self::InlineClass|get#getter(ic);
   () → core::int f = self::InlineClass|get#method(ic);
   core::int g = let final core::int #t12 = 42 in let final void #t13 = self::InlineClass|set#setter(ic, #t12) in #t12;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.strong.transformed.expect
index 95ec6f20f7b..75dc287cdbe 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.strong.transformed.expect
@@ -60,13 +60,13 @@ extension type InlineClass(core::int it) {
 static extension-member method _extension#0|get#setter(lowered final core::Object #this) → core::int
   return 42;
 static extension-member method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
-static inline-class-member method InlineClass|(dynamic it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(dynamic it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → dynamic {
   core::int a = self::InlineClass|+(#this, 2);
   core::int b = self::InlineClass|unary-(#this);
   core::int c = self::InlineClass|[](#this, 2);
@@ -109,35 +109,35 @@ Try correcting the name to the name of an existing setter, or defining a setter
   core::int n1 = self::InlineClass|call(#this);
   core::int n2 = self::InlineClass|call(#this);
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → dynamic
   return () → dynamic => self::InlineClass|test(#this);
-static inline-class-member method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
+static inline-class-member method InlineClass|+(lowered final self::InlineClass /* = core::int */ #this, core::int other) → core::int
   return 42;
-static inline-class-member method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|unary-(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 87;
-static inline-class-member method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
+static inline-class-member method InlineClass|[](lowered final self::InlineClass /* = core::int */ #this, core::int index) → core::int
   return 123;
-static inline-class-member method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
-static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|[]=(lowered final self::InlineClass /* = core::int */ #this, core::int index, core::int value) → void {}
+static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|method(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|method(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#method(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|method(#this);
-static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
-static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
+static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass /* = core::int */ #this, core::int value) → void {}
+static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass /* = core::int */ #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
   return t;
-static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
+static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass /* = core::int */ #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::InlineClass|genericMethod<T%>(#this, t);
-static inline-class-member method InlineClass|call(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|call(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 321;
-static inline-class-member method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#call(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|call(#this);
-static method test(self::InlineClass ic) → dynamic {
+static method test(self::InlineClass /* = core::int */ ic) → dynamic {
   core::int a = self::InlineClass|+(ic, 2);
   core::int b = self::InlineClass|unary-(ic);
   core::int c = self::InlineClass|[](ic, 2);
-  core::int d = let final self::InlineClass #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
+  core::int d = let final self::InlineClass /* = core::int */ #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
   core::int e = self::InlineClass|get#getter(ic);
   () → core::int f = self::InlineClass|get#method(ic);
   core::int g = let final core::int #t12 = 42 in let final void #t13 = self::InlineClass|set#setter(ic, #t12) in #t12;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.weak.expect
index a1f3a151450..91994442759 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.weak.expect
@@ -60,13 +60,13 @@ extension type InlineClass(core::int it) {
 static extension-member method _extension#0|get#setter(lowered final core::Object #this) → core::int
   return 42;
 static extension-member method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
-static inline-class-member method InlineClass|(dynamic it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(dynamic it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → dynamic {
   core::int a = self::InlineClass|+(#this, 2);
   core::int b = self::InlineClass|unary-(#this);
   core::int c = self::InlineClass|[](#this, 2);
@@ -109,35 +109,35 @@ Try correcting the name to the name of an existing setter, or defining a setter
   core::int n1 = self::InlineClass|call(#this);
   core::int n2 = self::InlineClass|call(#this);
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → dynamic
   return () → dynamic => self::InlineClass|test(#this);
-static inline-class-member method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
+static inline-class-member method InlineClass|+(lowered final self::InlineClass /* = core::int */ #this, core::int other) → core::int
   return 42;
-static inline-class-member method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|unary-(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 87;
-static inline-class-member method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
+static inline-class-member method InlineClass|[](lowered final self::InlineClass /* = core::int */ #this, core::int index) → core::int
   return 123;
-static inline-class-member method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
-static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|[]=(lowered final self::InlineClass /* = core::int */ #this, core::int index, core::int value) → void {}
+static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|method(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|method(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#method(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|method(#this);
-static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
-static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
+static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass /* = core::int */ #this, core::int value) → void {}
+static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass /* = core::int */ #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
   return t;
-static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
+static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass /* = core::int */ #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::InlineClass|genericMethod<T%>(#this, t);
-static inline-class-member method InlineClass|call(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|call(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 321;
-static inline-class-member method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#call(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|call(#this);
-static method test(self::InlineClass ic) → dynamic {
+static method test(self::InlineClass /* = core::int */ ic) → dynamic {
   core::int a = self::InlineClass|+(ic, 2);
   core::int b = self::InlineClass|unary-(ic);
   core::int c = self::InlineClass|[](ic, 2);
-  core::int d = let final self::InlineClass #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
+  core::int d = let final self::InlineClass /* = core::int */ #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
   core::int e = self::InlineClass|get#getter(ic);
   () → core::int f = self::InlineClass|get#method(ic);
   core::int g = let final core::int #t12 = 42 in let final void #t13 = self::InlineClass|set#setter(ic, #t12) in #t12;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.weak.modular.expect
index a1f3a151450..91994442759 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.weak.modular.expect
@@ -60,13 +60,13 @@ extension type InlineClass(core::int it) {
 static extension-member method _extension#0|get#setter(lowered final core::Object #this) → core::int
   return 42;
 static extension-member method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
-static inline-class-member method InlineClass|(dynamic it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(dynamic it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → dynamic {
   core::int a = self::InlineClass|+(#this, 2);
   core::int b = self::InlineClass|unary-(#this);
   core::int c = self::InlineClass|[](#this, 2);
@@ -109,35 +109,35 @@ Try correcting the name to the name of an existing setter, or defining a setter
   core::int n1 = self::InlineClass|call(#this);
   core::int n2 = self::InlineClass|call(#this);
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → dynamic
   return () → dynamic => self::InlineClass|test(#this);
-static inline-class-member method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
+static inline-class-member method InlineClass|+(lowered final self::InlineClass /* = core::int */ #this, core::int other) → core::int
   return 42;
-static inline-class-member method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|unary-(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 87;
-static inline-class-member method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
+static inline-class-member method InlineClass|[](lowered final self::InlineClass /* = core::int */ #this, core::int index) → core::int
   return 123;
-static inline-class-member method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
-static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|[]=(lowered final self::InlineClass /* = core::int */ #this, core::int index, core::int value) → void {}
+static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|method(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|method(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#method(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|method(#this);
-static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
-static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
+static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass /* = core::int */ #this, core::int value) → void {}
+static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass /* = core::int */ #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
   return t;
-static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
+static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass /* = core::int */ #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::InlineClass|genericMethod<T%>(#this, t);
-static inline-class-member method InlineClass|call(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|call(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 321;
-static inline-class-member method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#call(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|call(#this);
-static method test(self::InlineClass ic) → dynamic {
+static method test(self::InlineClass /* = core::int */ ic) → dynamic {
   core::int a = self::InlineClass|+(ic, 2);
   core::int b = self::InlineClass|unary-(ic);
   core::int c = self::InlineClass|[](ic, 2);
-  core::int d = let final self::InlineClass #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
+  core::int d = let final self::InlineClass /* = core::int */ #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
   core::int e = self::InlineClass|get#getter(ic);
   () → core::int f = self::InlineClass|get#method(ic);
   core::int g = let final core::int #t12 = 42 in let final void #t13 = self::InlineClass|set#setter(ic, #t12) in #t12;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.weak.outline.expect
index 596a49f9d20..7c841cfd192 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.weak.outline.expect
@@ -28,37 +28,37 @@ static extension-member method _extension#0|get#setter(lowered final core::Objec
   ;
 static extension-member method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void
   ;
-static inline-class-member method InlineClass|(dynamic it) → self::InlineClass
+static inline-class-member method InlineClass|(dynamic it) → self::InlineClass /* = core::int */
   ;
-static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → dynamic
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → dynamic
   ;
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → dynamic
   return () → dynamic => self::InlineClass|test(#this);
-static inline-class-member method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
+static inline-class-member method InlineClass|+(lowered final self::InlineClass /* = core::int */ #this, core::int other) → core::int
   ;
-static inline-class-member method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|unary-(lowered final self::InlineClass /* = core::int */ #this) → core::int
   ;
-static inline-class-member method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
+static inline-class-member method InlineClass|[](lowered final self::InlineClass /* = core::int */ #this, core::int index) → core::int
   ;
-static inline-class-member method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void
+static inline-class-member method InlineClass|[]=(lowered final self::InlineClass /* = core::int */ #this, core::int index, core::int value) → void
   ;
-static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass /* = core::int */ #this) → core::int
   ;
-static inline-class-member method InlineClass|method(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|method(lowered final self::InlineClass /* = core::int */ #this) → core::int
   ;
-static inline-class-member method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#method(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|method(#this);
-static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void
+static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass /* = core::int */ #this, core::int value) → void
   ;
-static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
+static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass /* = core::int */ #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
   ;
-static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
+static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass /* = core::int */ #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::InlineClass|genericMethod<T%>(#this, t);
-static inline-class-member method InlineClass|call(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|call(lowered final self::InlineClass /* = core::int */ #this) → core::int
   ;
-static inline-class-member method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#call(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|call(#this);
-static method test(self::InlineClass ic) → dynamic
+static method test(self::InlineClass /* = core::int */ ic) → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.weak.transformed.expect
index 95ec6f20f7b..75dc287cdbe 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/method_access.dart.weak.transformed.expect
@@ -60,13 +60,13 @@ extension type InlineClass(core::int it) {
 static extension-member method _extension#0|get#setter(lowered final core::Object #this) → core::int
   return 42;
 static extension-member method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
-static inline-class-member method InlineClass|(dynamic it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(dynamic it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(dynamic it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → dynamic {
   core::int a = self::InlineClass|+(#this, 2);
   core::int b = self::InlineClass|unary-(#this);
   core::int c = self::InlineClass|[](#this, 2);
@@ -109,35 +109,35 @@ Try correcting the name to the name of an existing setter, or defining a setter
   core::int n1 = self::InlineClass|call(#this);
   core::int n2 = self::InlineClass|call(#this);
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → dynamic
   return () → dynamic => self::InlineClass|test(#this);
-static inline-class-member method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
+static inline-class-member method InlineClass|+(lowered final self::InlineClass /* = core::int */ #this, core::int other) → core::int
   return 42;
-static inline-class-member method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|unary-(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 87;
-static inline-class-member method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
+static inline-class-member method InlineClass|[](lowered final self::InlineClass /* = core::int */ #this, core::int index) → core::int
   return 123;
-static inline-class-member method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
-static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|[]=(lowered final self::InlineClass /* = core::int */ #this, core::int index, core::int value) → void {}
+static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|method(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|method(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#method(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|method(#this);
-static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
-static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
+static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass /* = core::int */ #this, core::int value) → void {}
+static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass /* = core::int */ #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
   return t;
-static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
+static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass /* = core::int */ #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::InlineClass|genericMethod<T%>(#this, t);
-static inline-class-member method InlineClass|call(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|call(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 321;
-static inline-class-member method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#call(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|call(#this);
-static method test(self::InlineClass ic) → dynamic {
+static method test(self::InlineClass /* = core::int */ ic) → dynamic {
   core::int a = self::InlineClass|+(ic, 2);
   core::int b = self::InlineClass|unary-(ic);
   core::int c = self::InlineClass|[](ic, 2);
-  core::int d = let final self::InlineClass #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
+  core::int d = let final self::InlineClass /* = core::int */ #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
   core::int e = self::InlineClass|get#getter(ic);
   () → core::int f = self::InlineClass|get#method(ic);
   core::int g = let final core::int #t12 = 42 in let final void #t13 = self::InlineClass|set#setter(ic, #t12) in #t12;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.strong.expect
index 756e00c9f41..4595a816d05 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.strong.expect
@@ -97,75 +97,75 @@ extension type ET_CovariantAlias2<T extends core::Object? = dynamic>(((T%) → v
   constructor • = self::ET_CovariantAlias2|;
   tearoff • = self::ET_CovariantAlias2|_#new#tearOff;
 }
-static inline-class-member method ET_Contravariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|::T%> {
-  lowered final self::ET_Contravariant<self::ET_Contravariant|::T%> #this = f;
+static inline-class-member method ET_Contravariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|::T%> /* = (self::ET_Contravariant|::T%) → void */ {
+  lowered final self::ET_Contravariant<self::ET_Contravariant|::T%> /* = (self::ET_Contravariant|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Contravariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|_#new#tearOff::T%>
+static inline-class-member method ET_Contravariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|_#new#tearOff::T%> /* = (self::ET_Contravariant|_#new#tearOff::T%) → void */
   return self::ET_Contravariant|<self::ET_Contravariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_Invariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|::T%> {
-  lowered final self::ET_Invariant<self::ET_Invariant|::T%> #this = f;
+static inline-class-member method ET_Invariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|::T%> /* = <S extends self::ET_Invariant|::T% = dynamic>() → void */ {
+  lowered final self::ET_Invariant<self::ET_Invariant|::T%> /* = <S extends self::ET_Invariant|::T% = dynamic>() → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Invariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|_#new#tearOff::T%>
+static inline-class-member method ET_Invariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|_#new#tearOff::T%> /* = <S extends self::ET_Invariant|_#new#tearOff::T% = dynamic>() → void */
   return self::ET_Invariant|<self::ET_Invariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_Covariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|::T%> {
-  lowered final self::ET_Covariant<self::ET_Covariant|::T%> #this = f;
+static inline-class-member method ET_Covariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|::T%> /* = () → self::ET_Covariant|::T% */ {
+  lowered final self::ET_Covariant<self::ET_Covariant|::T%> /* = () → self::ET_Covariant|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Covariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|_#new#tearOff::T%>
+static inline-class-member method ET_Covariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|_#new#tearOff::T%> /* = () → self::ET_Covariant|_#new#tearOff::T% */
   return self::ET_Covariant|<self::ET_Covariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_Bivariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|::T%> {
-  lowered final self::ET_Bivariant<self::ET_Bivariant|::T%> #this = f;
+static inline-class-member method ET_Bivariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|::T%> /* = (self::ET_Bivariant|::T%) → self::ET_Bivariant|::T% */ {
+  lowered final self::ET_Bivariant<self::ET_Bivariant|::T%> /* = (self::ET_Bivariant|::T%) → self::ET_Bivariant|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Bivariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|_#new#tearOff::T%>
+static inline-class-member method ET_Bivariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|_#new#tearOff::T%> /* = (self::ET_Bivariant|_#new#tearOff::T%) → self::ET_Bivariant|_#new#tearOff::T% */
   return self::ET_Bivariant|<self::ET_Bivariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_ContravariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> {
-  lowered final self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> #this = f;
+static inline-class-member method ET_ContravariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> /* = (self::ET_ContravariantAlias|::T%) → void */ {
+  lowered final self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> /* = (self::ET_ContravariantAlias|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_ContravariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_ContravariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|_#new#tearOff::T%> /* = (self::ET_ContravariantAlias|_#new#tearOff::T%) → void */
   return self::ET_ContravariantAlias|<self::ET_ContravariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_InvariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> {
-  lowered final self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> #this = f;
+static inline-class-member method ET_InvariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> /* = <S extends self::ET_InvariantAlias|::T% = dynamic>() → void */ {
+  lowered final self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> /* = <S extends self::ET_InvariantAlias|::T% = dynamic>() → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_InvariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_InvariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|_#new#tearOff::T%> /* = <S extends self::ET_InvariantAlias|_#new#tearOff::T% = dynamic>() → void */
   return self::ET_InvariantAlias|<self::ET_InvariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_CovariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> {
-  lowered final self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> #this = f;
+static inline-class-member method ET_CovariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> /* = () → self::ET_CovariantAlias|::T% */ {
+  lowered final self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> /* = () → self::ET_CovariantAlias|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_CovariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_CovariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|_#new#tearOff::T%> /* = () → self::ET_CovariantAlias|_#new#tearOff::T% */
   return self::ET_CovariantAlias|<self::ET_CovariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_BivariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> {
-  lowered final self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> #this = f;
+static inline-class-member method ET_BivariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> /* = (self::ET_BivariantAlias|::T%) → self::ET_BivariantAlias|::T% */ {
+  lowered final self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> /* = (self::ET_BivariantAlias|::T%) → self::ET_BivariantAlias|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_BivariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_BivariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|_#new#tearOff::T%> /* = (self::ET_BivariantAlias|_#new#tearOff::T%) → self::ET_BivariantAlias|_#new#tearOff::T% */
   return self::ET_BivariantAlias|<self::ET_BivariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_ContravariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> {
-  lowered final self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> #this = f;
+static inline-class-member method ET_ContravariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> /* = () → (self::ET_ContravariantAlias1|::T%) → void */ {
+  lowered final self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> /* = () → (self::ET_ContravariantAlias1|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_ContravariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|_#new#tearOff::T%>
+static inline-class-member method ET_ContravariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|_#new#tearOff::T%> /* = () → (self::ET_ContravariantAlias1|_#new#tearOff::T%) → void */
   return self::ET_ContravariantAlias1|<self::ET_ContravariantAlias1|_#new#tearOff::T%>(f);
-static inline-class-member method ET_ContravariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> {
-  lowered final self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> #this = f;
+static inline-class-member method ET_ContravariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> /* = (() → self::ET_ContravariantAlias2|::T%) → void */ {
+  lowered final self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> /* = (() → self::ET_ContravariantAlias2|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_ContravariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|_#new#tearOff::T%>
+static inline-class-member method ET_ContravariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|_#new#tearOff::T%> /* = (() → self::ET_ContravariantAlias2|_#new#tearOff::T%) → void */
   return self::ET_ContravariantAlias2|<self::ET_ContravariantAlias2|_#new#tearOff::T%>(f);
-static inline-class-member method ET_CovariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> {
-  lowered final self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> #this = f;
+static inline-class-member method ET_CovariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> /* = () → () → self::ET_CovariantAlias1|::T% */ {
+  lowered final self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> /* = () → () → self::ET_CovariantAlias1|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_CovariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|_#new#tearOff::T%>
+static inline-class-member method ET_CovariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|_#new#tearOff::T%> /* = () → () → self::ET_CovariantAlias1|_#new#tearOff::T% */
   return self::ET_CovariantAlias1|<self::ET_CovariantAlias1|_#new#tearOff::T%>(f);
-static inline-class-member method ET_CovariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> {
-  lowered final self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> #this = f;
+static inline-class-member method ET_CovariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> /* = ((self::ET_CovariantAlias2|::T%) → void) → void */ {
+  lowered final self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> /* = ((self::ET_CovariantAlias2|::T%) → void) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_CovariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|_#new#tearOff::T%>
+static inline-class-member method ET_CovariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|_#new#tearOff::T%> /* = ((self::ET_CovariantAlias2|_#new#tearOff::T%) → void) → void */
   return self::ET_CovariantAlias2|<self::ET_CovariantAlias2|_#new#tearOff::T%>(f);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.strong.transformed.expect
index 756e00c9f41..4595a816d05 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.strong.transformed.expect
@@ -97,75 +97,75 @@ extension type ET_CovariantAlias2<T extends core::Object? = dynamic>(((T%) → v
   constructor • = self::ET_CovariantAlias2|;
   tearoff • = self::ET_CovariantAlias2|_#new#tearOff;
 }
-static inline-class-member method ET_Contravariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|::T%> {
-  lowered final self::ET_Contravariant<self::ET_Contravariant|::T%> #this = f;
+static inline-class-member method ET_Contravariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|::T%> /* = (self::ET_Contravariant|::T%) → void */ {
+  lowered final self::ET_Contravariant<self::ET_Contravariant|::T%> /* = (self::ET_Contravariant|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Contravariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|_#new#tearOff::T%>
+static inline-class-member method ET_Contravariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|_#new#tearOff::T%> /* = (self::ET_Contravariant|_#new#tearOff::T%) → void */
   return self::ET_Contravariant|<self::ET_Contravariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_Invariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|::T%> {
-  lowered final self::ET_Invariant<self::ET_Invariant|::T%> #this = f;
+static inline-class-member method ET_Invariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|::T%> /* = <S extends self::ET_Invariant|::T% = dynamic>() → void */ {
+  lowered final self::ET_Invariant<self::ET_Invariant|::T%> /* = <S extends self::ET_Invariant|::T% = dynamic>() → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Invariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|_#new#tearOff::T%>
+static inline-class-member method ET_Invariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|_#new#tearOff::T%> /* = <S extends self::ET_Invariant|_#new#tearOff::T% = dynamic>() → void */
   return self::ET_Invariant|<self::ET_Invariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_Covariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|::T%> {
-  lowered final self::ET_Covariant<self::ET_Covariant|::T%> #this = f;
+static inline-class-member method ET_Covariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|::T%> /* = () → self::ET_Covariant|::T% */ {
+  lowered final self::ET_Covariant<self::ET_Covariant|::T%> /* = () → self::ET_Covariant|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Covariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|_#new#tearOff::T%>
+static inline-class-member method ET_Covariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|_#new#tearOff::T%> /* = () → self::ET_Covariant|_#new#tearOff::T% */
   return self::ET_Covariant|<self::ET_Covariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_Bivariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|::T%> {
-  lowered final self::ET_Bivariant<self::ET_Bivariant|::T%> #this = f;
+static inline-class-member method ET_Bivariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|::T%> /* = (self::ET_Bivariant|::T%) → self::ET_Bivariant|::T% */ {
+  lowered final self::ET_Bivariant<self::ET_Bivariant|::T%> /* = (self::ET_Bivariant|::T%) → self::ET_Bivariant|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Bivariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|_#new#tearOff::T%>
+static inline-class-member method ET_Bivariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|_#new#tearOff::T%> /* = (self::ET_Bivariant|_#new#tearOff::T%) → self::ET_Bivariant|_#new#tearOff::T% */
   return self::ET_Bivariant|<self::ET_Bivariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_ContravariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> {
-  lowered final self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> #this = f;
+static inline-class-member method ET_ContravariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> /* = (self::ET_ContravariantAlias|::T%) → void */ {
+  lowered final self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> /* = (self::ET_ContravariantAlias|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_ContravariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_ContravariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|_#new#tearOff::T%> /* = (self::ET_ContravariantAlias|_#new#tearOff::T%) → void */
   return self::ET_ContravariantAlias|<self::ET_ContravariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_InvariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> {
-  lowered final self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> #this = f;
+static inline-class-member method ET_InvariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> /* = <S extends self::ET_InvariantAlias|::T% = dynamic>() → void */ {
+  lowered final self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> /* = <S extends self::ET_InvariantAlias|::T% = dynamic>() → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_InvariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_InvariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|_#new#tearOff::T%> /* = <S extends self::ET_InvariantAlias|_#new#tearOff::T% = dynamic>() → void */
   return self::ET_InvariantAlias|<self::ET_InvariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_CovariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> {
-  lowered final self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> #this = f;
+static inline-class-member method ET_CovariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> /* = () → self::ET_CovariantAlias|::T% */ {
+  lowered final self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> /* = () → self::ET_CovariantAlias|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_CovariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_CovariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|_#new#tearOff::T%> /* = () → self::ET_CovariantAlias|_#new#tearOff::T% */
   return self::ET_CovariantAlias|<self::ET_CovariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_BivariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> {
-  lowered final self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> #this = f;
+static inline-class-member method ET_BivariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> /* = (self::ET_BivariantAlias|::T%) → self::ET_BivariantAlias|::T% */ {
+  lowered final self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> /* = (self::ET_BivariantAlias|::T%) → self::ET_BivariantAlias|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_BivariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_BivariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|_#new#tearOff::T%> /* = (self::ET_BivariantAlias|_#new#tearOff::T%) → self::ET_BivariantAlias|_#new#tearOff::T% */
   return self::ET_BivariantAlias|<self::ET_BivariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_ContravariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> {
-  lowered final self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> #this = f;
+static inline-class-member method ET_ContravariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> /* = () → (self::ET_ContravariantAlias1|::T%) → void */ {
+  lowered final self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> /* = () → (self::ET_ContravariantAlias1|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_ContravariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|_#new#tearOff::T%>
+static inline-class-member method ET_ContravariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|_#new#tearOff::T%> /* = () → (self::ET_ContravariantAlias1|_#new#tearOff::T%) → void */
   return self::ET_ContravariantAlias1|<self::ET_ContravariantAlias1|_#new#tearOff::T%>(f);
-static inline-class-member method ET_ContravariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> {
-  lowered final self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> #this = f;
+static inline-class-member method ET_ContravariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> /* = (() → self::ET_ContravariantAlias2|::T%) → void */ {
+  lowered final self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> /* = (() → self::ET_ContravariantAlias2|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_ContravariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|_#new#tearOff::T%>
+static inline-class-member method ET_ContravariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|_#new#tearOff::T%> /* = (() → self::ET_ContravariantAlias2|_#new#tearOff::T%) → void */
   return self::ET_ContravariantAlias2|<self::ET_ContravariantAlias2|_#new#tearOff::T%>(f);
-static inline-class-member method ET_CovariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> {
-  lowered final self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> #this = f;
+static inline-class-member method ET_CovariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> /* = () → () → self::ET_CovariantAlias1|::T% */ {
+  lowered final self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> /* = () → () → self::ET_CovariantAlias1|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_CovariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|_#new#tearOff::T%>
+static inline-class-member method ET_CovariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|_#new#tearOff::T%> /* = () → () → self::ET_CovariantAlias1|_#new#tearOff::T% */
   return self::ET_CovariantAlias1|<self::ET_CovariantAlias1|_#new#tearOff::T%>(f);
-static inline-class-member method ET_CovariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> {
-  lowered final self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> #this = f;
+static inline-class-member method ET_CovariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> /* = ((self::ET_CovariantAlias2|::T%) → void) → void */ {
+  lowered final self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> /* = ((self::ET_CovariantAlias2|::T%) → void) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_CovariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|_#new#tearOff::T%>
+static inline-class-member method ET_CovariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|_#new#tearOff::T%> /* = ((self::ET_CovariantAlias2|_#new#tearOff::T%) → void) → void */
   return self::ET_CovariantAlias2|<self::ET_CovariantAlias2|_#new#tearOff::T%>(f);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.weak.expect
index 756e00c9f41..4595a816d05 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.weak.expect
@@ -97,75 +97,75 @@ extension type ET_CovariantAlias2<T extends core::Object? = dynamic>(((T%) → v
   constructor • = self::ET_CovariantAlias2|;
   tearoff • = self::ET_CovariantAlias2|_#new#tearOff;
 }
-static inline-class-member method ET_Contravariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|::T%> {
-  lowered final self::ET_Contravariant<self::ET_Contravariant|::T%> #this = f;
+static inline-class-member method ET_Contravariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|::T%> /* = (self::ET_Contravariant|::T%) → void */ {
+  lowered final self::ET_Contravariant<self::ET_Contravariant|::T%> /* = (self::ET_Contravariant|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Contravariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|_#new#tearOff::T%>
+static inline-class-member method ET_Contravariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|_#new#tearOff::T%> /* = (self::ET_Contravariant|_#new#tearOff::T%) → void */
   return self::ET_Contravariant|<self::ET_Contravariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_Invariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|::T%> {
-  lowered final self::ET_Invariant<self::ET_Invariant|::T%> #this = f;
+static inline-class-member method ET_Invariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|::T%> /* = <S extends self::ET_Invariant|::T% = dynamic>() → void */ {
+  lowered final self::ET_Invariant<self::ET_Invariant|::T%> /* = <S extends self::ET_Invariant|::T% = dynamic>() → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Invariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|_#new#tearOff::T%>
+static inline-class-member method ET_Invariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|_#new#tearOff::T%> /* = <S extends self::ET_Invariant|_#new#tearOff::T% = dynamic>() → void */
   return self::ET_Invariant|<self::ET_Invariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_Covariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|::T%> {
-  lowered final self::ET_Covariant<self::ET_Covariant|::T%> #this = f;
+static inline-class-member method ET_Covariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|::T%> /* = () → self::ET_Covariant|::T% */ {
+  lowered final self::ET_Covariant<self::ET_Covariant|::T%> /* = () → self::ET_Covariant|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Covariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|_#new#tearOff::T%>
+static inline-class-member method ET_Covariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|_#new#tearOff::T%> /* = () → self::ET_Covariant|_#new#tearOff::T% */
   return self::ET_Covariant|<self::ET_Covariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_Bivariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|::T%> {
-  lowered final self::ET_Bivariant<self::ET_Bivariant|::T%> #this = f;
+static inline-class-member method ET_Bivariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|::T%> /* = (self::ET_Bivariant|::T%) → self::ET_Bivariant|::T% */ {
+  lowered final self::ET_Bivariant<self::ET_Bivariant|::T%> /* = (self::ET_Bivariant|::T%) → self::ET_Bivariant|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Bivariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|_#new#tearOff::T%>
+static inline-class-member method ET_Bivariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|_#new#tearOff::T%> /* = (self::ET_Bivariant|_#new#tearOff::T%) → self::ET_Bivariant|_#new#tearOff::T% */
   return self::ET_Bivariant|<self::ET_Bivariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_ContravariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> {
-  lowered final self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> #this = f;
+static inline-class-member method ET_ContravariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> /* = (self::ET_ContravariantAlias|::T%) → void */ {
+  lowered final self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> /* = (self::ET_ContravariantAlias|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_ContravariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_ContravariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|_#new#tearOff::T%> /* = (self::ET_ContravariantAlias|_#new#tearOff::T%) → void */
   return self::ET_ContravariantAlias|<self::ET_ContravariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_InvariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> {
-  lowered final self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> #this = f;
+static inline-class-member method ET_InvariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> /* = <S extends self::ET_InvariantAlias|::T% = dynamic>() → void */ {
+  lowered final self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> /* = <S extends self::ET_InvariantAlias|::T% = dynamic>() → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_InvariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_InvariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|_#new#tearOff::T%> /* = <S extends self::ET_InvariantAlias|_#new#tearOff::T% = dynamic>() → void */
   return self::ET_InvariantAlias|<self::ET_InvariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_CovariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> {
-  lowered final self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> #this = f;
+static inline-class-member method ET_CovariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> /* = () → self::ET_CovariantAlias|::T% */ {
+  lowered final self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> /* = () → self::ET_CovariantAlias|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_CovariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_CovariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|_#new#tearOff::T%> /* = () → self::ET_CovariantAlias|_#new#tearOff::T% */
   return self::ET_CovariantAlias|<self::ET_CovariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_BivariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> {
-  lowered final self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> #this = f;
+static inline-class-member method ET_BivariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> /* = (self::ET_BivariantAlias|::T%) → self::ET_BivariantAlias|::T% */ {
+  lowered final self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> /* = (self::ET_BivariantAlias|::T%) → self::ET_BivariantAlias|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_BivariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_BivariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|_#new#tearOff::T%> /* = (self::ET_BivariantAlias|_#new#tearOff::T%) → self::ET_BivariantAlias|_#new#tearOff::T% */
   return self::ET_BivariantAlias|<self::ET_BivariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_ContravariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> {
-  lowered final self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> #this = f;
+static inline-class-member method ET_ContravariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> /* = () → (self::ET_ContravariantAlias1|::T%) → void */ {
+  lowered final self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> /* = () → (self::ET_ContravariantAlias1|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_ContravariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|_#new#tearOff::T%>
+static inline-class-member method ET_ContravariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|_#new#tearOff::T%> /* = () → (self::ET_ContravariantAlias1|_#new#tearOff::T%) → void */
   return self::ET_ContravariantAlias1|<self::ET_ContravariantAlias1|_#new#tearOff::T%>(f);
-static inline-class-member method ET_ContravariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> {
-  lowered final self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> #this = f;
+static inline-class-member method ET_ContravariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> /* = (() → self::ET_ContravariantAlias2|::T%) → void */ {
+  lowered final self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> /* = (() → self::ET_ContravariantAlias2|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_ContravariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|_#new#tearOff::T%>
+static inline-class-member method ET_ContravariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|_#new#tearOff::T%> /* = (() → self::ET_ContravariantAlias2|_#new#tearOff::T%) → void */
   return self::ET_ContravariantAlias2|<self::ET_ContravariantAlias2|_#new#tearOff::T%>(f);
-static inline-class-member method ET_CovariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> {
-  lowered final self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> #this = f;
+static inline-class-member method ET_CovariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> /* = () → () → self::ET_CovariantAlias1|::T% */ {
+  lowered final self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> /* = () → () → self::ET_CovariantAlias1|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_CovariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|_#new#tearOff::T%>
+static inline-class-member method ET_CovariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|_#new#tearOff::T%> /* = () → () → self::ET_CovariantAlias1|_#new#tearOff::T% */
   return self::ET_CovariantAlias1|<self::ET_CovariantAlias1|_#new#tearOff::T%>(f);
-static inline-class-member method ET_CovariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> {
-  lowered final self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> #this = f;
+static inline-class-member method ET_CovariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> /* = ((self::ET_CovariantAlias2|::T%) → void) → void */ {
+  lowered final self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> /* = ((self::ET_CovariantAlias2|::T%) → void) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_CovariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|_#new#tearOff::T%>
+static inline-class-member method ET_CovariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|_#new#tearOff::T%> /* = ((self::ET_CovariantAlias2|_#new#tearOff::T%) → void) → void */
   return self::ET_CovariantAlias2|<self::ET_CovariantAlias2|_#new#tearOff::T%>(f);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.weak.modular.expect
index 756e00c9f41..4595a816d05 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.weak.modular.expect
@@ -97,75 +97,75 @@ extension type ET_CovariantAlias2<T extends core::Object? = dynamic>(((T%) → v
   constructor • = self::ET_CovariantAlias2|;
   tearoff • = self::ET_CovariantAlias2|_#new#tearOff;
 }
-static inline-class-member method ET_Contravariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|::T%> {
-  lowered final self::ET_Contravariant<self::ET_Contravariant|::T%> #this = f;
+static inline-class-member method ET_Contravariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|::T%> /* = (self::ET_Contravariant|::T%) → void */ {
+  lowered final self::ET_Contravariant<self::ET_Contravariant|::T%> /* = (self::ET_Contravariant|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Contravariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|_#new#tearOff::T%>
+static inline-class-member method ET_Contravariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|_#new#tearOff::T%> /* = (self::ET_Contravariant|_#new#tearOff::T%) → void */
   return self::ET_Contravariant|<self::ET_Contravariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_Invariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|::T%> {
-  lowered final self::ET_Invariant<self::ET_Invariant|::T%> #this = f;
+static inline-class-member method ET_Invariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|::T%> /* = <S extends self::ET_Invariant|::T% = dynamic>() → void */ {
+  lowered final self::ET_Invariant<self::ET_Invariant|::T%> /* = <S extends self::ET_Invariant|::T% = dynamic>() → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Invariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|_#new#tearOff::T%>
+static inline-class-member method ET_Invariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|_#new#tearOff::T%> /* = <S extends self::ET_Invariant|_#new#tearOff::T% = dynamic>() → void */
   return self::ET_Invariant|<self::ET_Invariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_Covariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|::T%> {
-  lowered final self::ET_Covariant<self::ET_Covariant|::T%> #this = f;
+static inline-class-member method ET_Covariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|::T%> /* = () → self::ET_Covariant|::T% */ {
+  lowered final self::ET_Covariant<self::ET_Covariant|::T%> /* = () → self::ET_Covariant|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Covariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|_#new#tearOff::T%>
+static inline-class-member method ET_Covariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|_#new#tearOff::T%> /* = () → self::ET_Covariant|_#new#tearOff::T% */
   return self::ET_Covariant|<self::ET_Covariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_Bivariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|::T%> {
-  lowered final self::ET_Bivariant<self::ET_Bivariant|::T%> #this = f;
+static inline-class-member method ET_Bivariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|::T%> /* = (self::ET_Bivariant|::T%) → self::ET_Bivariant|::T% */ {
+  lowered final self::ET_Bivariant<self::ET_Bivariant|::T%> /* = (self::ET_Bivariant|::T%) → self::ET_Bivariant|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Bivariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|_#new#tearOff::T%>
+static inline-class-member method ET_Bivariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|_#new#tearOff::T%> /* = (self::ET_Bivariant|_#new#tearOff::T%) → self::ET_Bivariant|_#new#tearOff::T% */
   return self::ET_Bivariant|<self::ET_Bivariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_ContravariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> {
-  lowered final self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> #this = f;
+static inline-class-member method ET_ContravariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> /* = (self::ET_ContravariantAlias|::T%) → void */ {
+  lowered final self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> /* = (self::ET_ContravariantAlias|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_ContravariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_ContravariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|_#new#tearOff::T%> /* = (self::ET_ContravariantAlias|_#new#tearOff::T%) → void */
   return self::ET_ContravariantAlias|<self::ET_ContravariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_InvariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> {
-  lowered final self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> #this = f;
+static inline-class-member method ET_InvariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> /* = <S extends self::ET_InvariantAlias|::T% = dynamic>() → void */ {
+  lowered final self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> /* = <S extends self::ET_InvariantAlias|::T% = dynamic>() → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_InvariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_InvariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|_#new#tearOff::T%> /* = <S extends self::ET_InvariantAlias|_#new#tearOff::T% = dynamic>() → void */
   return self::ET_InvariantAlias|<self::ET_InvariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_CovariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> {
-  lowered final self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> #this = f;
+static inline-class-member method ET_CovariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> /* = () → self::ET_CovariantAlias|::T% */ {
+  lowered final self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> /* = () → self::ET_CovariantAlias|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_CovariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_CovariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|_#new#tearOff::T%> /* = () → self::ET_CovariantAlias|_#new#tearOff::T% */
   return self::ET_CovariantAlias|<self::ET_CovariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_BivariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> {
-  lowered final self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> #this = f;
+static inline-class-member method ET_BivariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> /* = (self::ET_BivariantAlias|::T%) → self::ET_BivariantAlias|::T% */ {
+  lowered final self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> /* = (self::ET_BivariantAlias|::T%) → self::ET_BivariantAlias|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_BivariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_BivariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|_#new#tearOff::T%> /* = (self::ET_BivariantAlias|_#new#tearOff::T%) → self::ET_BivariantAlias|_#new#tearOff::T% */
   return self::ET_BivariantAlias|<self::ET_BivariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_ContravariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> {
-  lowered final self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> #this = f;
+static inline-class-member method ET_ContravariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> /* = () → (self::ET_ContravariantAlias1|::T%) → void */ {
+  lowered final self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> /* = () → (self::ET_ContravariantAlias1|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_ContravariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|_#new#tearOff::T%>
+static inline-class-member method ET_ContravariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|_#new#tearOff::T%> /* = () → (self::ET_ContravariantAlias1|_#new#tearOff::T%) → void */
   return self::ET_ContravariantAlias1|<self::ET_ContravariantAlias1|_#new#tearOff::T%>(f);
-static inline-class-member method ET_ContravariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> {
-  lowered final self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> #this = f;
+static inline-class-member method ET_ContravariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> /* = (() → self::ET_ContravariantAlias2|::T%) → void */ {
+  lowered final self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> /* = (() → self::ET_ContravariantAlias2|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_ContravariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|_#new#tearOff::T%>
+static inline-class-member method ET_ContravariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|_#new#tearOff::T%> /* = (() → self::ET_ContravariantAlias2|_#new#tearOff::T%) → void */
   return self::ET_ContravariantAlias2|<self::ET_ContravariantAlias2|_#new#tearOff::T%>(f);
-static inline-class-member method ET_CovariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> {
-  lowered final self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> #this = f;
+static inline-class-member method ET_CovariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> /* = () → () → self::ET_CovariantAlias1|::T% */ {
+  lowered final self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> /* = () → () → self::ET_CovariantAlias1|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_CovariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|_#new#tearOff::T%>
+static inline-class-member method ET_CovariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|_#new#tearOff::T%> /* = () → () → self::ET_CovariantAlias1|_#new#tearOff::T% */
   return self::ET_CovariantAlias1|<self::ET_CovariantAlias1|_#new#tearOff::T%>(f);
-static inline-class-member method ET_CovariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> {
-  lowered final self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> #this = f;
+static inline-class-member method ET_CovariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> /* = ((self::ET_CovariantAlias2|::T%) → void) → void */ {
+  lowered final self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> /* = ((self::ET_CovariantAlias2|::T%) → void) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_CovariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|_#new#tearOff::T%>
+static inline-class-member method ET_CovariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|_#new#tearOff::T%> /* = ((self::ET_CovariantAlias2|_#new#tearOff::T%) → void) → void */
   return self::ET_CovariantAlias2|<self::ET_CovariantAlias2|_#new#tearOff::T%>(f);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.weak.outline.expect
index d550c563dae..c997b9e4683 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.weak.outline.expect
@@ -97,51 +97,51 @@ extension type ET_CovariantAlias2<T extends core::Object? = dynamic>(((T%) → v
   constructor • = self::ET_CovariantAlias2|;
   tearoff • = self::ET_CovariantAlias2|_#new#tearOff;
 }
-static inline-class-member method ET_Contravariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|::T%>
+static inline-class-member method ET_Contravariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|::T%> /* = (self::ET_Contravariant|::T%) → void */
   ;
-static inline-class-member method ET_Contravariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|_#new#tearOff::T%>
+static inline-class-member method ET_Contravariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|_#new#tearOff::T%> /* = (self::ET_Contravariant|_#new#tearOff::T%) → void */
   return self::ET_Contravariant|<self::ET_Contravariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_Invariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|::T%>
+static inline-class-member method ET_Invariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|::T%> /* = <S extends self::ET_Invariant|::T% = dynamic>() → void */
   ;
-static inline-class-member method ET_Invariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|_#new#tearOff::T%>
+static inline-class-member method ET_Invariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|_#new#tearOff::T%> /* = <S extends self::ET_Invariant|_#new#tearOff::T% = dynamic>() → void */
   return self::ET_Invariant|<self::ET_Invariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_Covariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|::T%>
+static inline-class-member method ET_Covariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|::T%> /* = () → self::ET_Covariant|::T% */
   ;
-static inline-class-member method ET_Covariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|_#new#tearOff::T%>
+static inline-class-member method ET_Covariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|_#new#tearOff::T%> /* = () → self::ET_Covariant|_#new#tearOff::T% */
   return self::ET_Covariant|<self::ET_Covariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_Bivariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|::T%>
+static inline-class-member method ET_Bivariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|::T%> /* = (self::ET_Bivariant|::T%) → self::ET_Bivariant|::T% */
   ;
-static inline-class-member method ET_Bivariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|_#new#tearOff::T%>
+static inline-class-member method ET_Bivariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|_#new#tearOff::T%> /* = (self::ET_Bivariant|_#new#tearOff::T%) → self::ET_Bivariant|_#new#tearOff::T% */
   return self::ET_Bivariant|<self::ET_Bivariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_ContravariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%>
+static inline-class-member method ET_ContravariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> /* = (self::ET_ContravariantAlias|::T%) → void */
   ;
-static inline-class-member method ET_ContravariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_ContravariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|_#new#tearOff::T%> /* = (self::ET_ContravariantAlias|_#new#tearOff::T%) → void */
   return self::ET_ContravariantAlias|<self::ET_ContravariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_InvariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|::T%>
+static inline-class-member method ET_InvariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> /* = <S extends self::ET_InvariantAlias|::T% = dynamic>() → void */
   ;
-static inline-class-member method ET_InvariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_InvariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|_#new#tearOff::T%> /* = <S extends self::ET_InvariantAlias|_#new#tearOff::T% = dynamic>() → void */
   return self::ET_InvariantAlias|<self::ET_InvariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_CovariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|::T%>
+static inline-class-member method ET_CovariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> /* = () → self::ET_CovariantAlias|::T% */
   ;
-static inline-class-member method ET_CovariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_CovariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|_#new#tearOff::T%> /* = () → self::ET_CovariantAlias|_#new#tearOff::T% */
   return self::ET_CovariantAlias|<self::ET_CovariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_BivariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|::T%>
+static inline-class-member method ET_BivariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> /* = (self::ET_BivariantAlias|::T%) → self::ET_BivariantAlias|::T% */
   ;
-static inline-class-member method ET_BivariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_BivariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|_#new#tearOff::T%> /* = (self::ET_BivariantAlias|_#new#tearOff::T%) → self::ET_BivariantAlias|_#new#tearOff::T% */
   return self::ET_BivariantAlias|<self::ET_BivariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_ContravariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%>
+static inline-class-member method ET_ContravariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> /* = () → (self::ET_ContravariantAlias1|::T%) → void */
   ;
-static inline-class-member method ET_ContravariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|_#new#tearOff::T%>
+static inline-class-member method ET_ContravariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|_#new#tearOff::T%> /* = () → (self::ET_ContravariantAlias1|_#new#tearOff::T%) → void */
   return self::ET_ContravariantAlias1|<self::ET_ContravariantAlias1|_#new#tearOff::T%>(f);
-static inline-class-member method ET_ContravariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%>
+static inline-class-member method ET_ContravariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> /* = (() → self::ET_ContravariantAlias2|::T%) → void */
   ;
-static inline-class-member method ET_ContravariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|_#new#tearOff::T%>
+static inline-class-member method ET_ContravariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|_#new#tearOff::T%> /* = (() → self::ET_ContravariantAlias2|_#new#tearOff::T%) → void */
   return self::ET_ContravariantAlias2|<self::ET_ContravariantAlias2|_#new#tearOff::T%>(f);
-static inline-class-member method ET_CovariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%>
+static inline-class-member method ET_CovariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> /* = () → () → self::ET_CovariantAlias1|::T% */
   ;
-static inline-class-member method ET_CovariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|_#new#tearOff::T%>
+static inline-class-member method ET_CovariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|_#new#tearOff::T%> /* = () → () → self::ET_CovariantAlias1|_#new#tearOff::T% */
   return self::ET_CovariantAlias1|<self::ET_CovariantAlias1|_#new#tearOff::T%>(f);
-static inline-class-member method ET_CovariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%>
+static inline-class-member method ET_CovariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> /* = ((self::ET_CovariantAlias2|::T%) → void) → void */
   ;
-static inline-class-member method ET_CovariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|_#new#tearOff::T%>
+static inline-class-member method ET_CovariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|_#new#tearOff::T%> /* = ((self::ET_CovariantAlias2|_#new#tearOff::T%) → void) → void */
   return self::ET_CovariantAlias2|<self::ET_CovariantAlias2|_#new#tearOff::T%>(f);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.weak.transformed.expect
index 756e00c9f41..4595a816d05 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/non_covariant_type_parameter.dart.weak.transformed.expect
@@ -97,75 +97,75 @@ extension type ET_CovariantAlias2<T extends core::Object? = dynamic>(((T%) → v
   constructor • = self::ET_CovariantAlias2|;
   tearoff • = self::ET_CovariantAlias2|_#new#tearOff;
 }
-static inline-class-member method ET_Contravariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|::T%> {
-  lowered final self::ET_Contravariant<self::ET_Contravariant|::T%> #this = f;
+static inline-class-member method ET_Contravariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|::T%> /* = (self::ET_Contravariant|::T%) → void */ {
+  lowered final self::ET_Contravariant<self::ET_Contravariant|::T%> /* = (self::ET_Contravariant|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Contravariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|_#new#tearOff::T%>
+static inline-class-member method ET_Contravariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Contravariant<self::ET_Contravariant|_#new#tearOff::T%> /* = (self::ET_Contravariant|_#new#tearOff::T%) → void */
   return self::ET_Contravariant|<self::ET_Contravariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_Invariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|::T%> {
-  lowered final self::ET_Invariant<self::ET_Invariant|::T%> #this = f;
+static inline-class-member method ET_Invariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|::T%> /* = <S extends self::ET_Invariant|::T% = dynamic>() → void */ {
+  lowered final self::ET_Invariant<self::ET_Invariant|::T%> /* = <S extends self::ET_Invariant|::T% = dynamic>() → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Invariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|_#new#tearOff::T%>
+static inline-class-member method ET_Invariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Invariant<self::ET_Invariant|_#new#tearOff::T%> /* = <S extends self::ET_Invariant|_#new#tearOff::T% = dynamic>() → void */
   return self::ET_Invariant|<self::ET_Invariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_Covariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|::T%> {
-  lowered final self::ET_Covariant<self::ET_Covariant|::T%> #this = f;
+static inline-class-member method ET_Covariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|::T%> /* = () → self::ET_Covariant|::T% */ {
+  lowered final self::ET_Covariant<self::ET_Covariant|::T%> /* = () → self::ET_Covariant|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Covariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|_#new#tearOff::T%>
+static inline-class-member method ET_Covariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Covariant<self::ET_Covariant|_#new#tearOff::T%> /* = () → self::ET_Covariant|_#new#tearOff::T% */
   return self::ET_Covariant|<self::ET_Covariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_Bivariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|::T%> {
-  lowered final self::ET_Bivariant<self::ET_Bivariant|::T%> #this = f;
+static inline-class-member method ET_Bivariant|<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|::T%> /* = (self::ET_Bivariant|::T%) → self::ET_Bivariant|::T% */ {
+  lowered final self::ET_Bivariant<self::ET_Bivariant|::T%> /* = (self::ET_Bivariant|::T%) → self::ET_Bivariant|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_Bivariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|_#new#tearOff::T%>
+static inline-class-member method ET_Bivariant|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_Bivariant<self::ET_Bivariant|_#new#tearOff::T%> /* = (self::ET_Bivariant|_#new#tearOff::T%) → self::ET_Bivariant|_#new#tearOff::T% */
   return self::ET_Bivariant|<self::ET_Bivariant|_#new#tearOff::T%>(f);
-static inline-class-member method ET_ContravariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> {
-  lowered final self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> #this = f;
+static inline-class-member method ET_ContravariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> /* = (self::ET_ContravariantAlias|::T%) → void */ {
+  lowered final self::ET_ContravariantAlias<self::ET_ContravariantAlias|::T%> /* = (self::ET_ContravariantAlias|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_ContravariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_ContravariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias<self::ET_ContravariantAlias|_#new#tearOff::T%> /* = (self::ET_ContravariantAlias|_#new#tearOff::T%) → void */
   return self::ET_ContravariantAlias|<self::ET_ContravariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_InvariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> {
-  lowered final self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> #this = f;
+static inline-class-member method ET_InvariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> /* = <S extends self::ET_InvariantAlias|::T% = dynamic>() → void */ {
+  lowered final self::ET_InvariantAlias<self::ET_InvariantAlias|::T%> /* = <S extends self::ET_InvariantAlias|::T% = dynamic>() → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_InvariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_InvariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_InvariantAlias<self::ET_InvariantAlias|_#new#tearOff::T%> /* = <S extends self::ET_InvariantAlias|_#new#tearOff::T% = dynamic>() → void */
   return self::ET_InvariantAlias|<self::ET_InvariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_CovariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> {
-  lowered final self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> #this = f;
+static inline-class-member method ET_CovariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> /* = () → self::ET_CovariantAlias|::T% */ {
+  lowered final self::ET_CovariantAlias<self::ET_CovariantAlias|::T%> /* = () → self::ET_CovariantAlias|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_CovariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_CovariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias<self::ET_CovariantAlias|_#new#tearOff::T%> /* = () → self::ET_CovariantAlias|_#new#tearOff::T% */
   return self::ET_CovariantAlias|<self::ET_CovariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_BivariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> {
-  lowered final self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> #this = f;
+static inline-class-member method ET_BivariantAlias|<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> /* = (self::ET_BivariantAlias|::T%) → self::ET_BivariantAlias|::T% */ {
+  lowered final self::ET_BivariantAlias<self::ET_BivariantAlias|::T%> /* = (self::ET_BivariantAlias|::T%) → self::ET_BivariantAlias|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_BivariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|_#new#tearOff::T%>
+static inline-class-member method ET_BivariantAlias|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_BivariantAlias<self::ET_BivariantAlias|_#new#tearOff::T%> /* = (self::ET_BivariantAlias|_#new#tearOff::T%) → self::ET_BivariantAlias|_#new#tearOff::T% */
   return self::ET_BivariantAlias|<self::ET_BivariantAlias|_#new#tearOff::T%>(f);
-static inline-class-member method ET_ContravariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> {
-  lowered final self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> #this = f;
+static inline-class-member method ET_ContravariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> /* = () → (self::ET_ContravariantAlias1|::T%) → void */ {
+  lowered final self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|::T%> /* = () → (self::ET_ContravariantAlias1|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_ContravariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|_#new#tearOff::T%>
+static inline-class-member method ET_ContravariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias1<self::ET_ContravariantAlias1|_#new#tearOff::T%> /* = () → (self::ET_ContravariantAlias1|_#new#tearOff::T%) → void */
   return self::ET_ContravariantAlias1|<self::ET_ContravariantAlias1|_#new#tearOff::T%>(f);
-static inline-class-member method ET_ContravariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> {
-  lowered final self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> #this = f;
+static inline-class-member method ET_ContravariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> /* = (() → self::ET_ContravariantAlias2|::T%) → void */ {
+  lowered final self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|::T%> /* = (() → self::ET_ContravariantAlias2|::T%) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_ContravariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|_#new#tearOff::T%>
+static inline-class-member method ET_ContravariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_ContravariantAlias2<self::ET_ContravariantAlias2|_#new#tearOff::T%> /* = (() → self::ET_ContravariantAlias2|_#new#tearOff::T%) → void */
   return self::ET_ContravariantAlias2|<self::ET_ContravariantAlias2|_#new#tearOff::T%>(f);
-static inline-class-member method ET_CovariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> {
-  lowered final self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> #this = f;
+static inline-class-member method ET_CovariantAlias1|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> /* = () → () → self::ET_CovariantAlias1|::T% */ {
+  lowered final self::ET_CovariantAlias1<self::ET_CovariantAlias1|::T%> /* = () → () → self::ET_CovariantAlias1|::T% */ #this = f;
   return #this;
 }
-static inline-class-member method ET_CovariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|_#new#tearOff::T%>
+static inline-class-member method ET_CovariantAlias1|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias1<self::ET_CovariantAlias1|_#new#tearOff::T%> /* = () → () → self::ET_CovariantAlias1|_#new#tearOff::T% */
   return self::ET_CovariantAlias1|<self::ET_CovariantAlias1|_#new#tearOff::T%>(f);
-static inline-class-member method ET_CovariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> {
-  lowered final self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> #this = f;
+static inline-class-member method ET_CovariantAlias2|<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> /* = ((self::ET_CovariantAlias2|::T%) → void) → void */ {
+  lowered final self::ET_CovariantAlias2<self::ET_CovariantAlias2|::T%> /* = ((self::ET_CovariantAlias2|::T%) → void) → void */ #this = f;
   return #this;
 }
-static inline-class-member method ET_CovariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|_#new#tearOff::T%>
+static inline-class-member method ET_CovariantAlias2|_#new#tearOff<T extends core::Object? = dynamic>(dynamic f) → self::ET_CovariantAlias2<self::ET_CovariantAlias2|_#new#tearOff::T%> /* = ((self::ET_CovariantAlias2|_#new#tearOff::T%) → void) → void */
   return self::ET_CovariantAlias2|<self::ET_CovariantAlias2|_#new#tearOff::T%>(f);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.strong.expect
index 79c869f4b6c..1004d92e3db 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.strong.expect
@@ -28,35 +28,35 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   constructor _ = self::GenericClass|_;
   tearoff _ = self::GenericClass|_#_#tearOff;
 }
-static inline-class-member method Class|_(dynamic it) → self::Class {
-  lowered final self::Class #this = it;
+static inline-class-member method Class|_(dynamic it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class|_#_#tearOff(dynamic it) → self::Class
+static inline-class-member method Class|_#_#tearOff(dynamic it) → self::Class /* = core::int */
   return self::Class|_(it);
-static inline-class-member method Class|instanceMethod(lowered final self::Class #this) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod(lowered final self::Class /* = core::int */ #this) → void {
+  self::Class /* = core::int */ local = #this;
   void localM = self::Class|instanceMethod(#this);
   () → void localT = self::Class|get#instanceMethod(#this);
   core::int localG = self::Class|get#instanceGetter(#this);
 }
-static inline-class-member method Class|get#instanceMethod(lowered final self::Class #this) → () → void
+static inline-class-member method Class|get#instanceMethod(lowered final self::Class /* = core::int */ #this) → () → void
   return () → void => self::Class|instanceMethod(#this);
-static inline-class-member method Class|get#instanceGetter(lowered final self::Class #this) → core::int
+static inline-class-member method Class|get#instanceGetter(lowered final self::Class /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod2(lowered final self::Class /* = core::int */ #this, core::String s, [core::int i = #C1]) → void {
+  self::Class /* = core::int */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::Class|genericInstanceMethod<core::String>(#this, s);
   core::int localG2 = self::Class|genericInstanceMethod<core::int>(#this, i);
   core::num localG3 = self::Class|genericInstanceMethod<core::num>(#this, i);
 }
-static inline-class-member method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
+static inline-class-member method Class|get#instanceMethod2(lowered final self::Class /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C1]) → void => self::Class|instanceMethod2(#this, s, i);
-static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
+static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class /* = core::int */ #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
   return s;
-static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class /* = core::int */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::Class|genericInstanceMethod<S%>(#this, s);
 static inline-class-member method Class|staticMethod() → void {
   self::Class|staticMethod();
@@ -66,35 +66,35 @@ static inline-class-member method Class|staticMethod() → void {
 }
 static inline-class-member method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
   return s;
-static inline-class-member method GenericClass|_<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_::T%> {
-  lowered final self::GenericClass<self::GenericClass|_::T%> #this = it;
+static inline-class-member method GenericClass|_<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_::T%> /* = self::GenericClass|_::T% */ {
+  lowered final self::GenericClass<self::GenericClass|_::T%> /* = self::GenericClass|_::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericClass|_#_#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#_#tearOff::T%>
+static inline-class-member method GenericClass|_#_#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#_#tearOff::T%> /* = self::GenericClass|_#_#tearOff::T% */
   return self::GenericClass|_<self::GenericClass|_#_#tearOff::T%>(it);
-static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
-  self::GenericClass<self::GenericClass|instanceMethod::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ #this) → void {
+  self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ local = #this;
   void localM = self::GenericClass|instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   () → void localT = self::GenericClass|get#instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   self::GenericClass|instanceMethod::T% localG = self::GenericClass|get#instanceGetter<self::GenericClass|instanceMethod::T%>(#this);
 }
-static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
+static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> /* = self::GenericClass|get#instanceMethod::T% */ #this) → () → void
   return () → void => self::GenericClass|instanceMethod<self::GenericClass|get#instanceMethod::T%>(#this);
-static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
+static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> /* = self::GenericClass|get#instanceGetter::T% */ #this) → self::GenericClass|get#instanceGetter::T%
   return throw "";
-static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
-  self::GenericClass<self::GenericClass|instanceMethod2::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ #this, core::String s, {core::int i = #C1}) → void {
+  self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::String>(#this, s);
   core::int localG2 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::int>(#this, i);
   core::num localG3 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::num>(#this, i);
 }
-static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
+static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> /* = self::GenericClass|get#instanceMethod2::T% */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C1}) → void => self::GenericClass|instanceMethod2<self::GenericClass|get#instanceMethod2::T%>(#this, s, i: i);
-static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
+static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> /* = self::GenericClass|genericInstanceMethod::T% */ #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
   return s;
-static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> /* = self::GenericClass|get#genericInstanceMethod::T% */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::GenericClass|genericInstanceMethod<self::GenericClass|get#genericInstanceMethod::T%, S%>(#this, s);
 static inline-class-member method GenericClass|staticMethod() → void {
   self::GenericClass|staticMethod();
diff --git a/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.strong.transformed.expect
index 79c869f4b6c..1004d92e3db 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.strong.transformed.expect
@@ -28,35 +28,35 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   constructor _ = self::GenericClass|_;
   tearoff _ = self::GenericClass|_#_#tearOff;
 }
-static inline-class-member method Class|_(dynamic it) → self::Class {
-  lowered final self::Class #this = it;
+static inline-class-member method Class|_(dynamic it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class|_#_#tearOff(dynamic it) → self::Class
+static inline-class-member method Class|_#_#tearOff(dynamic it) → self::Class /* = core::int */
   return self::Class|_(it);
-static inline-class-member method Class|instanceMethod(lowered final self::Class #this) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod(lowered final self::Class /* = core::int */ #this) → void {
+  self::Class /* = core::int */ local = #this;
   void localM = self::Class|instanceMethod(#this);
   () → void localT = self::Class|get#instanceMethod(#this);
   core::int localG = self::Class|get#instanceGetter(#this);
 }
-static inline-class-member method Class|get#instanceMethod(lowered final self::Class #this) → () → void
+static inline-class-member method Class|get#instanceMethod(lowered final self::Class /* = core::int */ #this) → () → void
   return () → void => self::Class|instanceMethod(#this);
-static inline-class-member method Class|get#instanceGetter(lowered final self::Class #this) → core::int
+static inline-class-member method Class|get#instanceGetter(lowered final self::Class /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod2(lowered final self::Class /* = core::int */ #this, core::String s, [core::int i = #C1]) → void {
+  self::Class /* = core::int */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::Class|genericInstanceMethod<core::String>(#this, s);
   core::int localG2 = self::Class|genericInstanceMethod<core::int>(#this, i);
   core::num localG3 = self::Class|genericInstanceMethod<core::num>(#this, i);
 }
-static inline-class-member method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
+static inline-class-member method Class|get#instanceMethod2(lowered final self::Class /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C1]) → void => self::Class|instanceMethod2(#this, s, i);
-static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
+static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class /* = core::int */ #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
   return s;
-static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class /* = core::int */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::Class|genericInstanceMethod<S%>(#this, s);
 static inline-class-member method Class|staticMethod() → void {
   self::Class|staticMethod();
@@ -66,35 +66,35 @@ static inline-class-member method Class|staticMethod() → void {
 }
 static inline-class-member method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
   return s;
-static inline-class-member method GenericClass|_<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_::T%> {
-  lowered final self::GenericClass<self::GenericClass|_::T%> #this = it;
+static inline-class-member method GenericClass|_<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_::T%> /* = self::GenericClass|_::T% */ {
+  lowered final self::GenericClass<self::GenericClass|_::T%> /* = self::GenericClass|_::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericClass|_#_#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#_#tearOff::T%>
+static inline-class-member method GenericClass|_#_#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#_#tearOff::T%> /* = self::GenericClass|_#_#tearOff::T% */
   return self::GenericClass|_<self::GenericClass|_#_#tearOff::T%>(it);
-static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
-  self::GenericClass<self::GenericClass|instanceMethod::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ #this) → void {
+  self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ local = #this;
   void localM = self::GenericClass|instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   () → void localT = self::GenericClass|get#instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   self::GenericClass|instanceMethod::T% localG = self::GenericClass|get#instanceGetter<self::GenericClass|instanceMethod::T%>(#this);
 }
-static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
+static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> /* = self::GenericClass|get#instanceMethod::T% */ #this) → () → void
   return () → void => self::GenericClass|instanceMethod<self::GenericClass|get#instanceMethod::T%>(#this);
-static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
+static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> /* = self::GenericClass|get#instanceGetter::T% */ #this) → self::GenericClass|get#instanceGetter::T%
   return throw "";
-static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
-  self::GenericClass<self::GenericClass|instanceMethod2::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ #this, core::String s, {core::int i = #C1}) → void {
+  self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::String>(#this, s);
   core::int localG2 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::int>(#this, i);
   core::num localG3 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::num>(#this, i);
 }
-static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
+static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> /* = self::GenericClass|get#instanceMethod2::T% */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C1}) → void => self::GenericClass|instanceMethod2<self::GenericClass|get#instanceMethod2::T%>(#this, s, i: i);
-static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
+static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> /* = self::GenericClass|genericInstanceMethod::T% */ #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
   return s;
-static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> /* = self::GenericClass|get#genericInstanceMethod::T% */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::GenericClass|genericInstanceMethod<self::GenericClass|get#genericInstanceMethod::T%, S%>(#this, s);
 static inline-class-member method GenericClass|staticMethod() → void {
   self::GenericClass|staticMethod();
diff --git a/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.weak.expect
index 79c869f4b6c..1004d92e3db 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.weak.expect
@@ -28,35 +28,35 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   constructor _ = self::GenericClass|_;
   tearoff _ = self::GenericClass|_#_#tearOff;
 }
-static inline-class-member method Class|_(dynamic it) → self::Class {
-  lowered final self::Class #this = it;
+static inline-class-member method Class|_(dynamic it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class|_#_#tearOff(dynamic it) → self::Class
+static inline-class-member method Class|_#_#tearOff(dynamic it) → self::Class /* = core::int */
   return self::Class|_(it);
-static inline-class-member method Class|instanceMethod(lowered final self::Class #this) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod(lowered final self::Class /* = core::int */ #this) → void {
+  self::Class /* = core::int */ local = #this;
   void localM = self::Class|instanceMethod(#this);
   () → void localT = self::Class|get#instanceMethod(#this);
   core::int localG = self::Class|get#instanceGetter(#this);
 }
-static inline-class-member method Class|get#instanceMethod(lowered final self::Class #this) → () → void
+static inline-class-member method Class|get#instanceMethod(lowered final self::Class /* = core::int */ #this) → () → void
   return () → void => self::Class|instanceMethod(#this);
-static inline-class-member method Class|get#instanceGetter(lowered final self::Class #this) → core::int
+static inline-class-member method Class|get#instanceGetter(lowered final self::Class /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod2(lowered final self::Class /* = core::int */ #this, core::String s, [core::int i = #C1]) → void {
+  self::Class /* = core::int */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::Class|genericInstanceMethod<core::String>(#this, s);
   core::int localG2 = self::Class|genericInstanceMethod<core::int>(#this, i);
   core::num localG3 = self::Class|genericInstanceMethod<core::num>(#this, i);
 }
-static inline-class-member method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
+static inline-class-member method Class|get#instanceMethod2(lowered final self::Class /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C1]) → void => self::Class|instanceMethod2(#this, s, i);
-static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
+static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class /* = core::int */ #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
   return s;
-static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class /* = core::int */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::Class|genericInstanceMethod<S%>(#this, s);
 static inline-class-member method Class|staticMethod() → void {
   self::Class|staticMethod();
@@ -66,35 +66,35 @@ static inline-class-member method Class|staticMethod() → void {
 }
 static inline-class-member method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
   return s;
-static inline-class-member method GenericClass|_<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_::T%> {
-  lowered final self::GenericClass<self::GenericClass|_::T%> #this = it;
+static inline-class-member method GenericClass|_<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_::T%> /* = self::GenericClass|_::T% */ {
+  lowered final self::GenericClass<self::GenericClass|_::T%> /* = self::GenericClass|_::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericClass|_#_#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#_#tearOff::T%>
+static inline-class-member method GenericClass|_#_#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#_#tearOff::T%> /* = self::GenericClass|_#_#tearOff::T% */
   return self::GenericClass|_<self::GenericClass|_#_#tearOff::T%>(it);
-static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
-  self::GenericClass<self::GenericClass|instanceMethod::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ #this) → void {
+  self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ local = #this;
   void localM = self::GenericClass|instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   () → void localT = self::GenericClass|get#instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   self::GenericClass|instanceMethod::T% localG = self::GenericClass|get#instanceGetter<self::GenericClass|instanceMethod::T%>(#this);
 }
-static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
+static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> /* = self::GenericClass|get#instanceMethod::T% */ #this) → () → void
   return () → void => self::GenericClass|instanceMethod<self::GenericClass|get#instanceMethod::T%>(#this);
-static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
+static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> /* = self::GenericClass|get#instanceGetter::T% */ #this) → self::GenericClass|get#instanceGetter::T%
   return throw "";
-static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
-  self::GenericClass<self::GenericClass|instanceMethod2::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ #this, core::String s, {core::int i = #C1}) → void {
+  self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::String>(#this, s);
   core::int localG2 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::int>(#this, i);
   core::num localG3 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::num>(#this, i);
 }
-static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
+static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> /* = self::GenericClass|get#instanceMethod2::T% */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C1}) → void => self::GenericClass|instanceMethod2<self::GenericClass|get#instanceMethod2::T%>(#this, s, i: i);
-static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
+static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> /* = self::GenericClass|genericInstanceMethod::T% */ #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
   return s;
-static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> /* = self::GenericClass|get#genericInstanceMethod::T% */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::GenericClass|genericInstanceMethod<self::GenericClass|get#genericInstanceMethod::T%, S%>(#this, s);
 static inline-class-member method GenericClass|staticMethod() → void {
   self::GenericClass|staticMethod();
diff --git a/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.weak.modular.expect
index 79c869f4b6c..1004d92e3db 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.weak.modular.expect
@@ -28,35 +28,35 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   constructor _ = self::GenericClass|_;
   tearoff _ = self::GenericClass|_#_#tearOff;
 }
-static inline-class-member method Class|_(dynamic it) → self::Class {
-  lowered final self::Class #this = it;
+static inline-class-member method Class|_(dynamic it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class|_#_#tearOff(dynamic it) → self::Class
+static inline-class-member method Class|_#_#tearOff(dynamic it) → self::Class /* = core::int */
   return self::Class|_(it);
-static inline-class-member method Class|instanceMethod(lowered final self::Class #this) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod(lowered final self::Class /* = core::int */ #this) → void {
+  self::Class /* = core::int */ local = #this;
   void localM = self::Class|instanceMethod(#this);
   () → void localT = self::Class|get#instanceMethod(#this);
   core::int localG = self::Class|get#instanceGetter(#this);
 }
-static inline-class-member method Class|get#instanceMethod(lowered final self::Class #this) → () → void
+static inline-class-member method Class|get#instanceMethod(lowered final self::Class /* = core::int */ #this) → () → void
   return () → void => self::Class|instanceMethod(#this);
-static inline-class-member method Class|get#instanceGetter(lowered final self::Class #this) → core::int
+static inline-class-member method Class|get#instanceGetter(lowered final self::Class /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod2(lowered final self::Class /* = core::int */ #this, core::String s, [core::int i = #C1]) → void {
+  self::Class /* = core::int */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::Class|genericInstanceMethod<core::String>(#this, s);
   core::int localG2 = self::Class|genericInstanceMethod<core::int>(#this, i);
   core::num localG3 = self::Class|genericInstanceMethod<core::num>(#this, i);
 }
-static inline-class-member method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
+static inline-class-member method Class|get#instanceMethod2(lowered final self::Class /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C1]) → void => self::Class|instanceMethod2(#this, s, i);
-static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
+static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class /* = core::int */ #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
   return s;
-static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class /* = core::int */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::Class|genericInstanceMethod<S%>(#this, s);
 static inline-class-member method Class|staticMethod() → void {
   self::Class|staticMethod();
@@ -66,35 +66,35 @@ static inline-class-member method Class|staticMethod() → void {
 }
 static inline-class-member method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
   return s;
-static inline-class-member method GenericClass|_<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_::T%> {
-  lowered final self::GenericClass<self::GenericClass|_::T%> #this = it;
+static inline-class-member method GenericClass|_<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_::T%> /* = self::GenericClass|_::T% */ {
+  lowered final self::GenericClass<self::GenericClass|_::T%> /* = self::GenericClass|_::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericClass|_#_#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#_#tearOff::T%>
+static inline-class-member method GenericClass|_#_#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#_#tearOff::T%> /* = self::GenericClass|_#_#tearOff::T% */
   return self::GenericClass|_<self::GenericClass|_#_#tearOff::T%>(it);
-static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
-  self::GenericClass<self::GenericClass|instanceMethod::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ #this) → void {
+  self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ local = #this;
   void localM = self::GenericClass|instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   () → void localT = self::GenericClass|get#instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   self::GenericClass|instanceMethod::T% localG = self::GenericClass|get#instanceGetter<self::GenericClass|instanceMethod::T%>(#this);
 }
-static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
+static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> /* = self::GenericClass|get#instanceMethod::T% */ #this) → () → void
   return () → void => self::GenericClass|instanceMethod<self::GenericClass|get#instanceMethod::T%>(#this);
-static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
+static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> /* = self::GenericClass|get#instanceGetter::T% */ #this) → self::GenericClass|get#instanceGetter::T%
   return throw "";
-static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
-  self::GenericClass<self::GenericClass|instanceMethod2::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ #this, core::String s, {core::int i = #C1}) → void {
+  self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::String>(#this, s);
   core::int localG2 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::int>(#this, i);
   core::num localG3 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::num>(#this, i);
 }
-static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
+static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> /* = self::GenericClass|get#instanceMethod2::T% */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C1}) → void => self::GenericClass|instanceMethod2<self::GenericClass|get#instanceMethod2::T%>(#this, s, i: i);
-static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
+static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> /* = self::GenericClass|genericInstanceMethod::T% */ #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
   return s;
-static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> /* = self::GenericClass|get#genericInstanceMethod::T% */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::GenericClass|genericInstanceMethod<self::GenericClass|get#genericInstanceMethod::T%, S%>(#this, s);
 static inline-class-member method GenericClass|staticMethod() → void {
   self::GenericClass|staticMethod();
diff --git a/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.weak.outline.expect
index 0644a2d9f2d..42bf35b7e68 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.weak.outline.expect
@@ -28,45 +28,45 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   constructor _ = self::GenericClass|_;
   tearoff _ = self::GenericClass|_#_#tearOff;
 }
-static inline-class-member method Class|_(dynamic it) → self::Class
+static inline-class-member method Class|_(dynamic it) → self::Class /* = core::int */
   ;
-static inline-class-member method Class|_#_#tearOff(dynamic it) → self::Class
+static inline-class-member method Class|_#_#tearOff(dynamic it) → self::Class /* = core::int */
   return self::Class|_(it);
-static inline-class-member method Class|instanceMethod(lowered final self::Class #this) → void
+static inline-class-member method Class|instanceMethod(lowered final self::Class /* = core::int */ #this) → void
   ;
-static inline-class-member method Class|get#instanceMethod(lowered final self::Class #this) → () → void
+static inline-class-member method Class|get#instanceMethod(lowered final self::Class /* = core::int */ #this) → () → void
   return () → void => self::Class|instanceMethod(#this);
-static inline-class-member method Class|get#instanceGetter(lowered final self::Class #this) → core::int
+static inline-class-member method Class|get#instanceGetter(lowered final self::Class /* = core::int */ #this) → core::int
   ;
-static inline-class-member method Class|instanceMethod2(lowered final self::Class #this, core::String s, [has-declared-initializer core::int i]) → void
+static inline-class-member method Class|instanceMethod2(lowered final self::Class /* = core::int */ #this, core::String s, [has-declared-initializer core::int i]) → void
   ;
-static inline-class-member method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
+static inline-class-member method Class|get#instanceMethod2(lowered final self::Class /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i]) → void => self::Class|instanceMethod2(#this, s, i);
-static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
+static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class /* = core::int */ #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
   ;
-static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class /* = core::int */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::Class|genericInstanceMethod<S%>(#this, s);
 static inline-class-member method Class|staticMethod() → void
   ;
 static inline-class-member method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
   ;
-static inline-class-member method GenericClass|_<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_::T%>
+static inline-class-member method GenericClass|_<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_::T%> /* = self::GenericClass|_::T% */
   ;
-static inline-class-member method GenericClass|_#_#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#_#tearOff::T%>
+static inline-class-member method GenericClass|_#_#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#_#tearOff::T%> /* = self::GenericClass|_#_#tearOff::T% */
   return self::GenericClass|_<self::GenericClass|_#_#tearOff::T%>(it);
-static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void
+static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ #this) → void
   ;
-static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
+static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> /* = self::GenericClass|get#instanceMethod::T% */ #this) → () → void
   return () → void => self::GenericClass|instanceMethod<self::GenericClass|get#instanceMethod::T%>(#this);
-static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
+static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> /* = self::GenericClass|get#instanceGetter::T% */ #this) → self::GenericClass|get#instanceGetter::T%
   ;
-static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {has-declared-initializer core::int i}) → void
+static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ #this, core::String s, {has-declared-initializer core::int i}) → void
   ;
-static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
+static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> /* = self::GenericClass|get#instanceMethod2::T% */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i}) → void => self::GenericClass|instanceMethod2<self::GenericClass|get#instanceMethod2::T%>(#this, s, i: i);
-static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
+static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> /* = self::GenericClass|genericInstanceMethod::T% */ #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
   ;
-static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> /* = self::GenericClass|get#genericInstanceMethod::T% */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::GenericClass|genericInstanceMethod<self::GenericClass|get#genericInstanceMethod::T%, S%>(#this, s);
 static inline-class-member method GenericClass|staticMethod() → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.weak.transformed.expect
index 79c869f4b6c..1004d92e3db 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/procedures.dart.weak.transformed.expect
@@ -28,35 +28,35 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   constructor _ = self::GenericClass|_;
   tearoff _ = self::GenericClass|_#_#tearOff;
 }
-static inline-class-member method Class|_(dynamic it) → self::Class {
-  lowered final self::Class #this = it;
+static inline-class-member method Class|_(dynamic it) → self::Class /* = core::int */ {
+  lowered final self::Class /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class|_#_#tearOff(dynamic it) → self::Class
+static inline-class-member method Class|_#_#tearOff(dynamic it) → self::Class /* = core::int */
   return self::Class|_(it);
-static inline-class-member method Class|instanceMethod(lowered final self::Class #this) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod(lowered final self::Class /* = core::int */ #this) → void {
+  self::Class /* = core::int */ local = #this;
   void localM = self::Class|instanceMethod(#this);
   () → void localT = self::Class|get#instanceMethod(#this);
   core::int localG = self::Class|get#instanceGetter(#this);
 }
-static inline-class-member method Class|get#instanceMethod(lowered final self::Class #this) → () → void
+static inline-class-member method Class|get#instanceMethod(lowered final self::Class /* = core::int */ #this) → () → void
   return () → void => self::Class|instanceMethod(#this);
-static inline-class-member method Class|get#instanceGetter(lowered final self::Class #this) → core::int
+static inline-class-member method Class|get#instanceGetter(lowered final self::Class /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod2(lowered final self::Class /* = core::int */ #this, core::String s, [core::int i = #C1]) → void {
+  self::Class /* = core::int */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::Class|genericInstanceMethod<core::String>(#this, s);
   core::int localG2 = self::Class|genericInstanceMethod<core::int>(#this, i);
   core::num localG3 = self::Class|genericInstanceMethod<core::num>(#this, i);
 }
-static inline-class-member method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
+static inline-class-member method Class|get#instanceMethod2(lowered final self::Class /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C1]) → void => self::Class|instanceMethod2(#this, s, i);
-static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
+static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class /* = core::int */ #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
   return s;
-static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class /* = core::int */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::Class|genericInstanceMethod<S%>(#this, s);
 static inline-class-member method Class|staticMethod() → void {
   self::Class|staticMethod();
@@ -66,35 +66,35 @@ static inline-class-member method Class|staticMethod() → void {
 }
 static inline-class-member method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
   return s;
-static inline-class-member method GenericClass|_<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_::T%> {
-  lowered final self::GenericClass<self::GenericClass|_::T%> #this = it;
+static inline-class-member method GenericClass|_<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_::T%> /* = self::GenericClass|_::T% */ {
+  lowered final self::GenericClass<self::GenericClass|_::T%> /* = self::GenericClass|_::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericClass|_#_#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#_#tearOff::T%>
+static inline-class-member method GenericClass|_#_#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::GenericClass<self::GenericClass|_#_#tearOff::T%> /* = self::GenericClass|_#_#tearOff::T% */
   return self::GenericClass|_<self::GenericClass|_#_#tearOff::T%>(it);
-static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
-  self::GenericClass<self::GenericClass|instanceMethod::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ #this) → void {
+  self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ local = #this;
   void localM = self::GenericClass|instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   () → void localT = self::GenericClass|get#instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   self::GenericClass|instanceMethod::T% localG = self::GenericClass|get#instanceGetter<self::GenericClass|instanceMethod::T%>(#this);
 }
-static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
+static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> /* = self::GenericClass|get#instanceMethod::T% */ #this) → () → void
   return () → void => self::GenericClass|instanceMethod<self::GenericClass|get#instanceMethod::T%>(#this);
-static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
+static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> /* = self::GenericClass|get#instanceGetter::T% */ #this) → self::GenericClass|get#instanceGetter::T%
   return throw "";
-static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
-  self::GenericClass<self::GenericClass|instanceMethod2::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ #this, core::String s, {core::int i = #C1}) → void {
+  self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::String>(#this, s);
   core::int localG2 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::int>(#this, i);
   core::num localG3 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::num>(#this, i);
 }
-static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
+static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> /* = self::GenericClass|get#instanceMethod2::T% */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C1}) → void => self::GenericClass|instanceMethod2<self::GenericClass|get#instanceMethod2::T%>(#this, s, i: i);
-static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
+static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> /* = self::GenericClass|genericInstanceMethod::T% */ #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
   return s;
-static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> /* = self::GenericClass|get#genericInstanceMethod::T% */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::GenericClass|genericInstanceMethod<self::GenericClass|get#genericInstanceMethod::T%, S%>(#this, s);
 static inline-class-member method GenericClass|staticMethod() → void {
   self::GenericClass|staticMethod();
diff --git a/pkg/front_end/testcases/inline_class/extension_types/representation.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/representation.dart.strong.expect
index 7fb202e1f91..03d2343c768 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/representation.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/representation.dart.strong.expect
@@ -44,20 +44,20 @@ extension type Duplicate(core::bool instanceField) {
   constructor • = self::Duplicate|;
   tearoff • = self::Duplicate|_#new#tearOff;
 }
-static inline-class-member method Missing|() → self::Missing {
-  lowered final self::Missing #this;
+static inline-class-member method Missing|() → self::Missing /* = invalid-type */ {
+  lowered final self::Missing /* = invalid-type */ #this;
   return #this;
 }
-static inline-class-member method Missing|_#new#tearOff() → self::Missing
+static inline-class-member method Missing|_#new#tearOff() → self::Missing /* = invalid-type */
   return self::Missing|();
-static inline-class-member method Multiple|(dynamic instanceField1, dynamic instanceField2) → self::Multiple {
-  lowered final self::Multiple #this = instanceField2;
+static inline-class-member method Multiple|(dynamic instanceField1, dynamic instanceField2) → self::Multiple /* = core::bool */ {
+  lowered final self::Multiple /* = core::bool */ #this = instanceField2;
   return #this;
 }
-static inline-class-member method Multiple|_#new#tearOff(dynamic instanceField1, dynamic instanceField2) → self::Multiple
+static inline-class-member method Multiple|_#new#tearOff(dynamic instanceField1, dynamic instanceField2) → self::Multiple /* = core::bool */
   return self::Multiple|(instanceField1, instanceField2);
-static inline-class-member method Duplicate|(dynamic instanceField, dynamic instanceField) → self::Duplicate {
-  lowered final self::Duplicate #this;
+static inline-class-member method Duplicate|(dynamic instanceField, dynamic instanceField) → self::Duplicate /* = core::bool */ {
+  lowered final self::Duplicate /* = core::bool */ #this;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/representation.dart:9:31: Error: Can't use 'instanceField' because it is declared more than once.
 extension type Duplicate(bool instanceField, int instanceField) {} // Error
                               ^^^^^^^^^^^^^";
@@ -66,5 +66,5 @@ extension type Duplicate(bool instanceField, int instanceField) {} // Error
                                                  ^^^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Duplicate|_#new#tearOff(dynamic instanceField, dynamic instanceField) → self::Duplicate
+static inline-class-member method Duplicate|_#new#tearOff(dynamic instanceField, dynamic instanceField) → self::Duplicate /* = core::bool */
   return self::Duplicate|(instanceField, instanceField);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/representation.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/representation.dart.strong.transformed.expect
index 7fb202e1f91..03d2343c768 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/representation.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/representation.dart.strong.transformed.expect
@@ -44,20 +44,20 @@ extension type Duplicate(core::bool instanceField) {
   constructor • = self::Duplicate|;
   tearoff • = self::Duplicate|_#new#tearOff;
 }
-static inline-class-member method Missing|() → self::Missing {
-  lowered final self::Missing #this;
+static inline-class-member method Missing|() → self::Missing /* = invalid-type */ {
+  lowered final self::Missing /* = invalid-type */ #this;
   return #this;
 }
-static inline-class-member method Missing|_#new#tearOff() → self::Missing
+static inline-class-member method Missing|_#new#tearOff() → self::Missing /* = invalid-type */
   return self::Missing|();
-static inline-class-member method Multiple|(dynamic instanceField1, dynamic instanceField2) → self::Multiple {
-  lowered final self::Multiple #this = instanceField2;
+static inline-class-member method Multiple|(dynamic instanceField1, dynamic instanceField2) → self::Multiple /* = core::bool */ {
+  lowered final self::Multiple /* = core::bool */ #this = instanceField2;
   return #this;
 }
-static inline-class-member method Multiple|_#new#tearOff(dynamic instanceField1, dynamic instanceField2) → self::Multiple
+static inline-class-member method Multiple|_#new#tearOff(dynamic instanceField1, dynamic instanceField2) → self::Multiple /* = core::bool */
   return self::Multiple|(instanceField1, instanceField2);
-static inline-class-member method Duplicate|(dynamic instanceField, dynamic instanceField) → self::Duplicate {
-  lowered final self::Duplicate #this;
+static inline-class-member method Duplicate|(dynamic instanceField, dynamic instanceField) → self::Duplicate /* = core::bool */ {
+  lowered final self::Duplicate /* = core::bool */ #this;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/representation.dart:9:31: Error: Can't use 'instanceField' because it is declared more than once.
 extension type Duplicate(bool instanceField, int instanceField) {} // Error
                               ^^^^^^^^^^^^^";
@@ -66,5 +66,5 @@ extension type Duplicate(bool instanceField, int instanceField) {} // Error
                                                  ^^^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Duplicate|_#new#tearOff(dynamic instanceField, dynamic instanceField) → self::Duplicate
+static inline-class-member method Duplicate|_#new#tearOff(dynamic instanceField, dynamic instanceField) → self::Duplicate /* = core::bool */
   return self::Duplicate|(instanceField, instanceField);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/representation.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/representation.dart.weak.expect
index 7fb202e1f91..03d2343c768 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/representation.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/representation.dart.weak.expect
@@ -44,20 +44,20 @@ extension type Duplicate(core::bool instanceField) {
   constructor • = self::Duplicate|;
   tearoff • = self::Duplicate|_#new#tearOff;
 }
-static inline-class-member method Missing|() → self::Missing {
-  lowered final self::Missing #this;
+static inline-class-member method Missing|() → self::Missing /* = invalid-type */ {
+  lowered final self::Missing /* = invalid-type */ #this;
   return #this;
 }
-static inline-class-member method Missing|_#new#tearOff() → self::Missing
+static inline-class-member method Missing|_#new#tearOff() → self::Missing /* = invalid-type */
   return self::Missing|();
-static inline-class-member method Multiple|(dynamic instanceField1, dynamic instanceField2) → self::Multiple {
-  lowered final self::Multiple #this = instanceField2;
+static inline-class-member method Multiple|(dynamic instanceField1, dynamic instanceField2) → self::Multiple /* = core::bool */ {
+  lowered final self::Multiple /* = core::bool */ #this = instanceField2;
   return #this;
 }
-static inline-class-member method Multiple|_#new#tearOff(dynamic instanceField1, dynamic instanceField2) → self::Multiple
+static inline-class-member method Multiple|_#new#tearOff(dynamic instanceField1, dynamic instanceField2) → self::Multiple /* = core::bool */
   return self::Multiple|(instanceField1, instanceField2);
-static inline-class-member method Duplicate|(dynamic instanceField, dynamic instanceField) → self::Duplicate {
-  lowered final self::Duplicate #this;
+static inline-class-member method Duplicate|(dynamic instanceField, dynamic instanceField) → self::Duplicate /* = core::bool */ {
+  lowered final self::Duplicate /* = core::bool */ #this;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/representation.dart:9:31: Error: Can't use 'instanceField' because it is declared more than once.
 extension type Duplicate(bool instanceField, int instanceField) {} // Error
                               ^^^^^^^^^^^^^";
@@ -66,5 +66,5 @@ extension type Duplicate(bool instanceField, int instanceField) {} // Error
                                                  ^^^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Duplicate|_#new#tearOff(dynamic instanceField, dynamic instanceField) → self::Duplicate
+static inline-class-member method Duplicate|_#new#tearOff(dynamic instanceField, dynamic instanceField) → self::Duplicate /* = core::bool */
   return self::Duplicate|(instanceField, instanceField);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/representation.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/representation.dart.weak.modular.expect
index 7fb202e1f91..03d2343c768 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/representation.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/representation.dart.weak.modular.expect
@@ -44,20 +44,20 @@ extension type Duplicate(core::bool instanceField) {
   constructor • = self::Duplicate|;
   tearoff • = self::Duplicate|_#new#tearOff;
 }
-static inline-class-member method Missing|() → self::Missing {
-  lowered final self::Missing #this;
+static inline-class-member method Missing|() → self::Missing /* = invalid-type */ {
+  lowered final self::Missing /* = invalid-type */ #this;
   return #this;
 }
-static inline-class-member method Missing|_#new#tearOff() → self::Missing
+static inline-class-member method Missing|_#new#tearOff() → self::Missing /* = invalid-type */
   return self::Missing|();
-static inline-class-member method Multiple|(dynamic instanceField1, dynamic instanceField2) → self::Multiple {
-  lowered final self::Multiple #this = instanceField2;
+static inline-class-member method Multiple|(dynamic instanceField1, dynamic instanceField2) → self::Multiple /* = core::bool */ {
+  lowered final self::Multiple /* = core::bool */ #this = instanceField2;
   return #this;
 }
-static inline-class-member method Multiple|_#new#tearOff(dynamic instanceField1, dynamic instanceField2) → self::Multiple
+static inline-class-member method Multiple|_#new#tearOff(dynamic instanceField1, dynamic instanceField2) → self::Multiple /* = core::bool */
   return self::Multiple|(instanceField1, instanceField2);
-static inline-class-member method Duplicate|(dynamic instanceField, dynamic instanceField) → self::Duplicate {
-  lowered final self::Duplicate #this;
+static inline-class-member method Duplicate|(dynamic instanceField, dynamic instanceField) → self::Duplicate /* = core::bool */ {
+  lowered final self::Duplicate /* = core::bool */ #this;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/representation.dart:9:31: Error: Can't use 'instanceField' because it is declared more than once.
 extension type Duplicate(bool instanceField, int instanceField) {} // Error
                               ^^^^^^^^^^^^^";
@@ -66,5 +66,5 @@ extension type Duplicate(bool instanceField, int instanceField) {} // Error
                                                  ^^^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Duplicate|_#new#tearOff(dynamic instanceField, dynamic instanceField) → self::Duplicate
+static inline-class-member method Duplicate|_#new#tearOff(dynamic instanceField, dynamic instanceField) → self::Duplicate /* = core::bool */
   return self::Duplicate|(instanceField, instanceField);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/representation.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/representation.dart.weak.outline.expect
index 919312e9231..1b312e15f3b 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/representation.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/representation.dart.weak.outline.expect
@@ -31,15 +31,15 @@ extension type Duplicate(core::bool instanceField) {
   constructor • = self::Duplicate|;
   tearoff • = self::Duplicate|_#new#tearOff;
 }
-static inline-class-member method Missing|() → self::Missing
+static inline-class-member method Missing|() → self::Missing /* = invalid-type */
   ;
-static inline-class-member method Missing|_#new#tearOff() → self::Missing
+static inline-class-member method Missing|_#new#tearOff() → self::Missing /* = invalid-type */
   return self::Missing|();
-static inline-class-member method Multiple|(dynamic instanceField1, dynamic instanceField2) → self::Multiple
+static inline-class-member method Multiple|(dynamic instanceField1, dynamic instanceField2) → self::Multiple /* = core::bool */
   ;
-static inline-class-member method Multiple|_#new#tearOff(dynamic instanceField1, dynamic instanceField2) → self::Multiple
+static inline-class-member method Multiple|_#new#tearOff(dynamic instanceField1, dynamic instanceField2) → self::Multiple /* = core::bool */
   return self::Multiple|(instanceField1, instanceField2);
-static inline-class-member method Duplicate|(dynamic instanceField, dynamic instanceField) → self::Duplicate
+static inline-class-member method Duplicate|(dynamic instanceField, dynamic instanceField) → self::Duplicate /* = core::bool */
   ;
-static inline-class-member method Duplicate|_#new#tearOff(dynamic instanceField, dynamic instanceField) → self::Duplicate
+static inline-class-member method Duplicate|_#new#tearOff(dynamic instanceField, dynamic instanceField) → self::Duplicate /* = core::bool */
   return self::Duplicate|(instanceField, instanceField);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/representation.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/representation.dart.weak.transformed.expect
index 7fb202e1f91..03d2343c768 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/representation.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/representation.dart.weak.transformed.expect
@@ -44,20 +44,20 @@ extension type Duplicate(core::bool instanceField) {
   constructor • = self::Duplicate|;
   tearoff • = self::Duplicate|_#new#tearOff;
 }
-static inline-class-member method Missing|() → self::Missing {
-  lowered final self::Missing #this;
+static inline-class-member method Missing|() → self::Missing /* = invalid-type */ {
+  lowered final self::Missing /* = invalid-type */ #this;
   return #this;
 }
-static inline-class-member method Missing|_#new#tearOff() → self::Missing
+static inline-class-member method Missing|_#new#tearOff() → self::Missing /* = invalid-type */
   return self::Missing|();
-static inline-class-member method Multiple|(dynamic instanceField1, dynamic instanceField2) → self::Multiple {
-  lowered final self::Multiple #this = instanceField2;
+static inline-class-member method Multiple|(dynamic instanceField1, dynamic instanceField2) → self::Multiple /* = core::bool */ {
+  lowered final self::Multiple /* = core::bool */ #this = instanceField2;
   return #this;
 }
-static inline-class-member method Multiple|_#new#tearOff(dynamic instanceField1, dynamic instanceField2) → self::Multiple
+static inline-class-member method Multiple|_#new#tearOff(dynamic instanceField1, dynamic instanceField2) → self::Multiple /* = core::bool */
   return self::Multiple|(instanceField1, instanceField2);
-static inline-class-member method Duplicate|(dynamic instanceField, dynamic instanceField) → self::Duplicate {
-  lowered final self::Duplicate #this;
+static inline-class-member method Duplicate|(dynamic instanceField, dynamic instanceField) → self::Duplicate /* = core::bool */ {
+  lowered final self::Duplicate /* = core::bool */ #this;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/extension_types/representation.dart:9:31: Error: Can't use 'instanceField' because it is declared more than once.
 extension type Duplicate(bool instanceField, int instanceField) {} // Error
                               ^^^^^^^^^^^^^";
@@ -66,5 +66,5 @@ extension type Duplicate(bool instanceField, int instanceField) {} // Error
                                                  ^^^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Duplicate|_#new#tearOff(dynamic instanceField, dynamic instanceField) → self::Duplicate
+static inline-class-member method Duplicate|_#new#tearOff(dynamic instanceField, dynamic instanceField) → self::Duplicate /* = core::bool */
   return self::Duplicate|(instanceField, instanceField);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart b/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart
new file mode 100644
index 00000000000..b44e50d7f24
--- /dev/null
+++ b/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart
@@ -0,0 +1,238 @@
+// Copyright (c) 2023, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+extension type A(int it) {}
+extension type Ba(A it) {}
+extension type Bb(A? it) {}
+extension type C<T>(T it) {}
+extension type Da<T>(C<T> it) {}
+extension type Db<T>(C<T?> it) {}
+extension type Dc<T>(C<T>? it) {}
+extension type E(int? it) {}
+extension type Fa(E it) {}
+extension type Fb(E? it) {}
+extension type G<T>(T? it) {}
+extension type Ha<T>(G<T> it) {}
+extension type Hb<T>(G<T?> it) {}
+extension type Hc<T>(G<T>? it) {}
+extension type I<T extends Object>(T it) {}
+extension type Ja<T extends Object>(I<T> it) {}
+extension type Jc<T extends Object>(I<T>? it) {}
+extension type K<T extends Object>(T? it) {}
+extension type La<T extends Object>(K<T> it) {}
+extension type Lc<T extends Object>(K<T>? it) {}
+
+testA(Never n) {
+  A a1 = n;
+  A? a2 = n;
+}
+
+testBa(Never n) {
+  Ba ba1 = n;
+  Ba? ba2 = n;
+  Bb bb3 = n;
+  Bb? bb4 = n;
+}
+
+testC<S, U extends Object>(Never n) {
+  C c1 = n;
+  C? c2 = n;
+  C<int> c3 = n;
+  C<int?> c4 = n;
+  C<int>? c5 = n;
+  C<int?>? c6 = n;
+  C<S> c7 = n;
+  C<S>? c8 = n;
+  C<S?> c9 = n;
+  C<S?>? c10 = n;
+  C<U> c11 = n;
+  C<U>? c12 = n;
+  C<U?> c13 = n;
+  C<U?>? c14 = n;
+}
+
+testDa<S, U extends Object>(Never n) {
+  Da da1 = n;
+  Da? da2 = n;
+  Da<int> da3 = n;
+  Da<int?> da4 = n;
+  Da<int>? da5 = n;
+  Da<int?>? da6 = n;
+  Da<S> da7 = n;
+  Da<S>? da8 = n;
+  Da<S?> da9 = n;
+  Da<S?>? da10 = n;
+  Da<U> da11 = n;
+  Da<U>? da12 = n;
+  Da<U?> da13 = n;
+  Da<U?>? da14 = n;
+}
+
+testDb<S, U extends Object>(Never n) {
+  Db db1 = n;
+  Db? db2 = n;
+  Db<int> db3 = n;
+  Db<int?> db4 = n;
+  Db<int>? db5 = n;
+  Db<int?>? db6 = n;
+  Db<S> db7 = n;
+  Db<S>? db8 = n;
+  Db<S?> db9 = n;
+  Db<S?>? db10 = n;
+  Db<U> db11 = n;
+  Db<U>? db12 = n;
+  Db<U?> db13 = n;
+  Db<U?>? db14 = n;
+}
+
+testDc<S, U extends Object>(Never n) {
+  Dc dc1 = n;
+  Dc? dc2 = n;
+  Dc<int> dc3 = n;
+  Dc<int?> dc4 = n;
+  Dc<int>? dc5 = n;
+  Dc<int?>? dc6 = n;
+  Dc<S> dc7 = n;
+  Dc<S>? dc8 = n;
+  Dc<S?> dc9 = n;
+  Dc<S?>? dc10 = n;
+  Dc<U> dc11 = n;
+  Dc<U>? dc12 = n;
+  Dc<U?> dc13 = n;
+  Dc<U?>? dc14 = n;
+}
+
+testE(Never n) {
+  E e1 = n;
+  E? e2 = n;
+}
+
+testF(Never n) {
+  Fa fa1 = n;
+  Fa? fa2 = n;
+  Fb fb3 = n;
+  Fb? fb4 = n;
+}
+
+testG<S, U extends Object>(Never n) {
+  G g1 = n;
+  G? g2 = n;
+  G<int> g3 = n;
+  G<int?> g4 = n;
+  G<int>? g5 = n;
+  G<int?>? g6 = n;
+  G<S> g7 = n;
+  G<S>? g8 = n;
+  G<S?> g9 = n;
+  G<S?>? g10 = n;
+  G<U> g11 = n;
+  G<U>? g12 = n;
+  G<U?> g13 = n;
+  G<U?>? g14 = n;
+}
+
+testHa<S, U extends Object>(Never n) {
+  Ha ha1 = n;
+  Ha? ha2 = n;
+  Ha<int> ha3 = n;
+  Ha<int?> ha4 = n;
+  Ha<int>? ha5 = n;
+  Ha<int?>? ha6 = n;
+  Ha<S> ha7 = n;
+  Ha<S>? ha8 = n;
+  Ha<S?> ha9 = n;
+  Ha<S?>? ha10 = n;
+  Ha<U> ha11 = n;
+  Ha<U>? ha12 = n;
+  Ha<U?> ha13 = n;
+  Ha<U?>? ha14 = n;
+}
+
+testHb<S, U extends Object>(Never n) {
+  Hb hb1 = n;
+  Hb? hb2 = n;
+  Hb<int> hb3 = n;
+  Hb<int?> hb4 = n;
+  Hb<int>? hb5 = n;
+  Hb<int?>? hb6 = n;
+  Hb<S> hb7 = n;
+  Hb<S>? hb8 = n;
+  Hb<S?> hb9 = n;
+  Hb<S?>? hb10 = n;
+  Hb<U> hb11 = n;
+  Hb<U>? hb12 = n;
+  Hb<U?> hb13 = n;
+  Hb<U?>? hb14 = n;
+}
+
+testHc<S, U extends Object>(Never n) {
+  Hc hc1 = n;
+  Hc? hc2 = n;
+  Hc<int> hc3 = n;
+  Hc<int?> hc4 = n;
+  Hc<int>? hc5 = n;
+  Hc<int?>? hc6 = n;
+  Hc<S> hc7 = n;
+  Hc<S>? hc8 = n;
+  Hc<S?> hc9 = n;
+  Hc<S?>? hc10 = n;
+  Hc<U> hc11 = n;
+  Hc<U>? hc12 = n;
+  Hc<U?> hc13 = n;
+  Hc<U?>? hc14 = n;
+}
+
+testI<U extends Object>(Never n) {
+  I i1 = n;
+  I? i2 = n;
+  I<int> i3 = n;
+  I<int>? i5 = n;
+  I<U> i11 = n;
+  I<U>? i12 = n;
+}
+
+testJa<U extends Object>(Never n) {
+  Ja ja1 = n;
+  Ja? ja2 = n;
+  Ja<int> ja3 = n;
+  Ja<int>? ja5 = n;
+  Ja<U> ja11 = n;
+  Ja<U>? ja12 = n;
+}
+
+testJc<U extends Object>(Never n) {
+  Jc jc1 = n;
+  Jc? jc2 = n;
+  Jc<int> jc3 = n;
+  Jc<int>? jc5 = n;
+  Jc<U> jc11 = n;
+  Jc<U>? jc12 = n;
+}
+
+testK<U extends Object>(Never n) {
+  K k1 = n;
+  K? k2 = n;
+  K<int> k3 = n;
+  K<int>? k5 = n;
+  K<U> k11 = n;
+  K<U>? k12 = n;
+}
+
+testLa<U extends Object>(Never n) {
+  La la1 = n;
+  La? la2 = n;
+  La<int> la3 = n;
+  La<int>? la5 = n;
+  La<U> la11 = n;
+  La<U>? la12 = n;
+}
+
+testLc<U extends Object>(Never n) {
+  Lc lc1 = n;
+  Lc? lc2 = n;
+  Lc<int> lc3 = n;
+  Lc<int>? lc5 = n;
+  Lc<U> lc11 = n;
+  Lc<U>? lc12 = n;
+}
\ No newline at end of file
diff --git a/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.strong.expect
new file mode 100644
index 00000000000..9dc182e4b45
--- /dev/null
+++ b/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.strong.expect
@@ -0,0 +1,400 @@
+library;
+import self as self;
+import "dart:core" as core;
+
+extension type A(core::int it) {
+  constructor • = self::A|;
+  tearoff • = self::A|_#new#tearOff;
+}
+extension type Ba(self::A /* = core::int */ it) {
+  constructor • = self::Ba|;
+  tearoff • = self::Ba|_#new#tearOff;
+}
+extension type Bb(self::A? /* = core::int? */ it) {
+  constructor • = self::Bb|;
+  tearoff • = self::Bb|_#new#tearOff;
+}
+extension type C<T extends core::Object? = dynamic>(T% it) {
+  constructor • = self::C|;
+  tearoff • = self::C|_#new#tearOff;
+}
+extension type Da<T extends core::Object? = dynamic>(self::C<T%> /* = T% */ it) {
+  constructor • = self::Da|;
+  tearoff • = self::Da|_#new#tearOff;
+}
+extension type Db<T extends core::Object? = dynamic>(self::C<T?> /* = T? */ it) {
+  constructor • = self::Db|;
+  tearoff • = self::Db|_#new#tearOff;
+}
+extension type Dc<T extends core::Object? = dynamic>(self::C<T%>? /* = T? */ it) {
+  constructor • = self::Dc|;
+  tearoff • = self::Dc|_#new#tearOff;
+}
+extension type E(core::int? it) {
+  constructor • = self::E|;
+  tearoff • = self::E|_#new#tearOff;
+}
+extension type Fa(self::E /* = core::int? */ it) {
+  constructor • = self::Fa|;
+  tearoff • = self::Fa|_#new#tearOff;
+}
+extension type Fb(self::E? /* = core::int? */ it) {
+  constructor • = self::Fb|;
+  tearoff • = self::Fb|_#new#tearOff;
+}
+extension type G<T extends core::Object? = dynamic>(T? it) {
+  constructor • = self::G|;
+  tearoff • = self::G|_#new#tearOff;
+}
+extension type Ha<T extends core::Object? = dynamic>(self::G<T%> /* = T? */ it) {
+  constructor • = self::Ha|;
+  tearoff • = self::Ha|_#new#tearOff;
+}
+extension type Hb<T extends core::Object? = dynamic>(self::G<T?> /* = T? */ it) {
+  constructor • = self::Hb|;
+  tearoff • = self::Hb|_#new#tearOff;
+}
+extension type Hc<T extends core::Object? = dynamic>(self::G<T%>? /* = T? */ it) {
+  constructor • = self::Hc|;
+  tearoff • = self::Hc|_#new#tearOff;
+}
+extension type I<T extends core::Object>(T it) {
+  constructor • = self::I|;
+  tearoff • = self::I|_#new#tearOff;
+}
+extension type Ja<T extends core::Object>(self::I<T> /* = T */ it) {
+  constructor • = self::Ja|;
+  tearoff • = self::Ja|_#new#tearOff;
+}
+extension type Jc<T extends core::Object>(self::I<T>? /* = T? */ it) {
+  constructor • = self::Jc|;
+  tearoff • = self::Jc|_#new#tearOff;
+}
+extension type K<T extends core::Object>(T? it) {
+  constructor • = self::K|;
+  tearoff • = self::K|_#new#tearOff;
+}
+extension type La<T extends core::Object>(self::K<T> /* = T? */ it) {
+  constructor • = self::La|;
+  tearoff • = self::La|_#new#tearOff;
+}
+extension type Lc<T extends core::Object>(self::K<T>? /* = T? */ it) {
+  constructor • = self::Lc|;
+  tearoff • = self::Lc|_#new#tearOff;
+}
+static inline-class-member method A|(dynamic it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
+  return #this;
+}
+static inline-class-member method A|_#new#tearOff(dynamic it) → self::A /* = core::int */
+  return self::A|(it);
+static inline-class-member method Ba|(dynamic it) → self::Ba /* = core::int */ {
+  lowered final self::Ba /* = core::int */ #this = it;
+  return #this;
+}
+static inline-class-member method Ba|_#new#tearOff(dynamic it) → self::Ba /* = core::int */
+  return self::Ba|(it);
+static inline-class-member method Bb|(dynamic it) → self::Bb /* = core::int? */ {
+  lowered final self::Bb /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method Bb|_#new#tearOff(dynamic it) → self::Bb /* = core::int? */
+  return self::Bb|(it);
+static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> /* = self::C|::T% */ {
+  lowered final self::C<self::C|::T%> /* = self::C|::T% */ #this = it;
+  return #this;
+}
+static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%> /* = self::C|_#new#tearOff::T% */
+  return self::C|<self::C|_#new#tearOff::T%>(it);
+static inline-class-member method Da|<T extends core::Object? = dynamic>(dynamic it) → self::Da<self::Da|::T%> /* = self::Da|::T% */ {
+  lowered final self::Da<self::Da|::T%> /* = self::Da|::T% */ #this = it;
+  return #this;
+}
+static inline-class-member method Da|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Da<self::Da|_#new#tearOff::T%> /* = self::Da|_#new#tearOff::T% */
+  return self::Da|<self::Da|_#new#tearOff::T%>(it);
+static inline-class-member method Db|<T extends core::Object? = dynamic>(dynamic it) → self::Db<self::Db|::T%> /* = self::Db|::T? */ {
+  lowered final self::Db<self::Db|::T%> /* = self::Db|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Db|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Db<self::Db|_#new#tearOff::T%> /* = self::Db|_#new#tearOff::T? */
+  return self::Db|<self::Db|_#new#tearOff::T%>(it);
+static inline-class-member method Dc|<T extends core::Object? = dynamic>(dynamic it) → self::Dc<self::Dc|::T%> /* = self::Dc|::T? */ {
+  lowered final self::Dc<self::Dc|::T%> /* = self::Dc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Dc|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Dc<self::Dc|_#new#tearOff::T%> /* = self::Dc|_#new#tearOff::T? */
+  return self::Dc|<self::Dc|_#new#tearOff::T%>(it);
+static inline-class-member method E|(dynamic it) → self::E /* = core::int? */ {
+  lowered final self::E /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = core::int? */
+  return self::E|(it);
+static inline-class-member method Fa|(dynamic it) → self::Fa /* = core::int? */ {
+  lowered final self::Fa /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method Fa|_#new#tearOff(dynamic it) → self::Fa /* = core::int? */
+  return self::Fa|(it);
+static inline-class-member method Fb|_#new#tearOff(dynamic it) → self::Fb /* = core::int? */
+  return self::Fb|(it);
+static inline-class-member method Fb|(dynamic it) → self::Fb /* = core::int? */ {
+  lowered final self::Fb /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method G|<T extends core::Object? = dynamic>(dynamic it) → self::G<self::G|::T%> /* = self::G|::T? */ {
+  lowered final self::G<self::G|::T%> /* = self::G|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method G|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::G<self::G|_#new#tearOff::T%> /* = self::G|_#new#tearOff::T? */
+  return self::G|<self::G|_#new#tearOff::T%>(it);
+static inline-class-member method Ha|<T extends core::Object? = dynamic>(dynamic it) → self::Ha<self::Ha|::T%> /* = self::Ha|::T? */ {
+  lowered final self::Ha<self::Ha|::T%> /* = self::Ha|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Ha|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Ha<self::Ha|_#new#tearOff::T%> /* = self::Ha|_#new#tearOff::T? */
+  return self::Ha|<self::Ha|_#new#tearOff::T%>(it);
+static inline-class-member method Hb|<T extends core::Object? = dynamic>(dynamic it) → self::Hb<self::Hb|::T%> /* = self::Hb|::T? */ {
+  lowered final self::Hb<self::Hb|::T%> /* = self::Hb|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Hb|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Hb<self::Hb|_#new#tearOff::T%> /* = self::Hb|_#new#tearOff::T? */
+  return self::Hb|<self::Hb|_#new#tearOff::T%>(it);
+static inline-class-member method Hc|<T extends core::Object? = dynamic>(dynamic it) → self::Hc<self::Hc|::T%> /* = self::Hc|::T? */ {
+  lowered final self::Hc<self::Hc|::T%> /* = self::Hc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Hc|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Hc<self::Hc|_#new#tearOff::T%> /* = self::Hc|_#new#tearOff::T? */
+  return self::Hc|<self::Hc|_#new#tearOff::T%>(it);
+static inline-class-member method I|<T extends core::Object = dynamic>(dynamic it) → self::I<self::I|::T> /* = self::I|::T */ {
+  lowered final self::I<self::I|::T> /* = self::I|::T */ #this = it;
+  return #this;
+}
+static inline-class-member method I|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::I<self::I|_#new#tearOff::T> /* = self::I|_#new#tearOff::T */
+  return self::I|<self::I|_#new#tearOff::T>(it);
+static inline-class-member method Ja|<T extends core::Object = dynamic>(dynamic it) → self::Ja<self::Ja|::T> /* = self::Ja|::T */ {
+  lowered final self::Ja<self::Ja|::T> /* = self::Ja|::T */ #this = it;
+  return #this;
+}
+static inline-class-member method Ja|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::Ja<self::Ja|_#new#tearOff::T> /* = self::Ja|_#new#tearOff::T */
+  return self::Ja|<self::Ja|_#new#tearOff::T>(it);
+static inline-class-member method Jc|<T extends core::Object = dynamic>(dynamic it) → self::Jc<self::Jc|::T> /* = self::Jc|::T? */ {
+  lowered final self::Jc<self::Jc|::T> /* = self::Jc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Jc|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::Jc<self::Jc|_#new#tearOff::T> /* = self::Jc|_#new#tearOff::T? */
+  return self::Jc|<self::Jc|_#new#tearOff::T>(it);
+static inline-class-member method K|<T extends core::Object = dynamic>(dynamic it) → self::K<self::K|::T> /* = self::K|::T? */ {
+  lowered final self::K<self::K|::T> /* = self::K|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method K|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::K<self::K|_#new#tearOff::T> /* = self::K|_#new#tearOff::T? */
+  return self::K|<self::K|_#new#tearOff::T>(it);
+static inline-class-member method La|<T extends core::Object = dynamic>(dynamic it) → self::La<self::La|::T> /* = self::La|::T? */ {
+  lowered final self::La<self::La|::T> /* = self::La|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method La|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::La<self::La|_#new#tearOff::T> /* = self::La|_#new#tearOff::T? */
+  return self::La|<self::La|_#new#tearOff::T>(it);
+static inline-class-member method Lc|<T extends core::Object = dynamic>(dynamic it) → self::Lc<self::Lc|::T> /* = self::Lc|::T? */ {
+  lowered final self::Lc<self::Lc|::T> /* = self::Lc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Lc|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::Lc<self::Lc|_#new#tearOff::T> /* = self::Lc|_#new#tearOff::T? */
+  return self::Lc|<self::Lc|_#new#tearOff::T>(it);
+static method testA(Never n) → dynamic {
+  self::A /* = core::int */ a1 = n;
+  self::A? /* = core::int? */ a2 = n;
+}
+static method testBa(Never n) → dynamic {
+  self::Ba /* = core::int */ ba1 = n;
+  self::Ba? /* = core::int? */ ba2 = n;
+  self::Bb /* = core::int? */ bb3 = n;
+  self::Bb? /* = core::int? */ bb4 = n;
+}
+static method testC<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::C<dynamic> /* = dynamic */ c1 = n;
+  self::C<dynamic>? /* = dynamic */ c2 = n;
+  self::C<core::int> /* = core::int */ c3 = n;
+  self::C<core::int?> /* = core::int? */ c4 = n;
+  self::C<core::int>? /* = core::int? */ c5 = n;
+  self::C<core::int?>? /* = core::int? */ c6 = n;
+  self::C<self::testC::S%> /* = self::testC::S% */ c7 = n;
+  self::C<self::testC::S%>? /* = self::testC::S? */ c8 = n;
+  self::C<self::testC::S?> /* = self::testC::S? */ c9 = n;
+  self::C<self::testC::S?>? /* = self::testC::S? */ c10 = n;
+  self::C<self::testC::U> /* = self::testC::U */ c11 = n;
+  self::C<self::testC::U>? /* = self::testC::U? */ c12 = n;
+  self::C<self::testC::U?> /* = self::testC::U? */ c13 = n;
+  self::C<self::testC::U?>? /* = self::testC::U? */ c14 = n;
+}
+static method testDa<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Da<dynamic> /* = dynamic */ da1 = n;
+  self::Da<dynamic>? /* = dynamic */ da2 = n;
+  self::Da<core::int> /* = core::int */ da3 = n;
+  self::Da<core::int?> /* = core::int? */ da4 = n;
+  self::Da<core::int>? /* = core::int? */ da5 = n;
+  self::Da<core::int?>? /* = core::int? */ da6 = n;
+  self::Da<self::testDa::S%> /* = self::testDa::S% */ da7 = n;
+  self::Da<self::testDa::S%>? /* = self::testDa::S? */ da8 = n;
+  self::Da<self::testDa::S?> /* = self::testDa::S? */ da9 = n;
+  self::Da<self::testDa::S?>? /* = self::testDa::S? */ da10 = n;
+  self::Da<self::testDa::U> /* = self::testDa::U */ da11 = n;
+  self::Da<self::testDa::U>? /* = self::testDa::U? */ da12 = n;
+  self::Da<self::testDa::U?> /* = self::testDa::U? */ da13 = n;
+  self::Da<self::testDa::U?>? /* = self::testDa::U? */ da14 = n;
+}
+static method testDb<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Db<dynamic> /* = dynamic */ db1 = n;
+  self::Db<dynamic>? /* = dynamic */ db2 = n;
+  self::Db<core::int> /* = core::int? */ db3 = n;
+  self::Db<core::int?> /* = core::int? */ db4 = n;
+  self::Db<core::int>? /* = core::int? */ db5 = n;
+  self::Db<core::int?>? /* = core::int? */ db6 = n;
+  self::Db<self::testDb::S%> /* = self::testDb::S? */ db7 = n;
+  self::Db<self::testDb::S%>? /* = self::testDb::S? */ db8 = n;
+  self::Db<self::testDb::S?> /* = self::testDb::S? */ db9 = n;
+  self::Db<self::testDb::S?>? /* = self::testDb::S? */ db10 = n;
+  self::Db<self::testDb::U> /* = self::testDb::U? */ db11 = n;
+  self::Db<self::testDb::U>? /* = self::testDb::U? */ db12 = n;
+  self::Db<self::testDb::U?> /* = self::testDb::U? */ db13 = n;
+  self::Db<self::testDb::U?>? /* = self::testDb::U? */ db14 = n;
+}
+static method testDc<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Dc<dynamic> /* = dynamic */ dc1 = n;
+  self::Dc<dynamic>? /* = dynamic */ dc2 = n;
+  self::Dc<core::int> /* = core::int? */ dc3 = n;
+  self::Dc<core::int?> /* = core::int? */ dc4 = n;
+  self::Dc<core::int>? /* = core::int? */ dc5 = n;
+  self::Dc<core::int?>? /* = core::int? */ dc6 = n;
+  self::Dc<self::testDc::S%> /* = self::testDc::S? */ dc7 = n;
+  self::Dc<self::testDc::S%>? /* = self::testDc::S? */ dc8 = n;
+  self::Dc<self::testDc::S?> /* = self::testDc::S? */ dc9 = n;
+  self::Dc<self::testDc::S?>? /* = self::testDc::S? */ dc10 = n;
+  self::Dc<self::testDc::U> /* = self::testDc::U? */ dc11 = n;
+  self::Dc<self::testDc::U>? /* = self::testDc::U? */ dc12 = n;
+  self::Dc<self::testDc::U?> /* = self::testDc::U? */ dc13 = n;
+  self::Dc<self::testDc::U?>? /* = self::testDc::U? */ dc14 = n;
+}
+static method testE(Never n) → dynamic {
+  self::E /* = core::int? */ e1 = n;
+  self::E? /* = core::int? */ e2 = n;
+}
+static method testF(Never n) → dynamic {
+  self::Fa /* = core::int? */ fa1 = n;
+  self::Fa? /* = core::int? */ fa2 = n;
+  self::Fb /* = core::int? */ fb3 = n;
+  self::Fb? /* = core::int? */ fb4 = n;
+}
+static method testG<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::G<dynamic> /* = dynamic */ g1 = n;
+  self::G<dynamic>? /* = dynamic */ g2 = n;
+  self::G<core::int> /* = core::int? */ g3 = n;
+  self::G<core::int?> /* = core::int? */ g4 = n;
+  self::G<core::int>? /* = core::int? */ g5 = n;
+  self::G<core::int?>? /* = core::int? */ g6 = n;
+  self::G<self::testG::S%> /* = self::testG::S? */ g7 = n;
+  self::G<self::testG::S%>? /* = self::testG::S? */ g8 = n;
+  self::G<self::testG::S?> /* = self::testG::S? */ g9 = n;
+  self::G<self::testG::S?>? /* = self::testG::S? */ g10 = n;
+  self::G<self::testG::U> /* = self::testG::U? */ g11 = n;
+  self::G<self::testG::U>? /* = self::testG::U? */ g12 = n;
+  self::G<self::testG::U?> /* = self::testG::U? */ g13 = n;
+  self::G<self::testG::U?>? /* = self::testG::U? */ g14 = n;
+}
+static method testHa<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Ha<dynamic> /* = dynamic */ ha1 = n;
+  self::Ha<dynamic>? /* = dynamic */ ha2 = n;
+  self::Ha<core::int> /* = core::int? */ ha3 = n;
+  self::Ha<core::int?> /* = core::int? */ ha4 = n;
+  self::Ha<core::int>? /* = core::int? */ ha5 = n;
+  self::Ha<core::int?>? /* = core::int? */ ha6 = n;
+  self::Ha<self::testHa::S%> /* = self::testHa::S? */ ha7 = n;
+  self::Ha<self::testHa::S%>? /* = self::testHa::S? */ ha8 = n;
+  self::Ha<self::testHa::S?> /* = self::testHa::S? */ ha9 = n;
+  self::Ha<self::testHa::S?>? /* = self::testHa::S? */ ha10 = n;
+  self::Ha<self::testHa::U> /* = self::testHa::U? */ ha11 = n;
+  self::Ha<self::testHa::U>? /* = self::testHa::U? */ ha12 = n;
+  self::Ha<self::testHa::U?> /* = self::testHa::U? */ ha13 = n;
+  self::Ha<self::testHa::U?>? /* = self::testHa::U? */ ha14 = n;
+}
+static method testHb<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Hb<dynamic> /* = dynamic */ hb1 = n;
+  self::Hb<dynamic>? /* = dynamic */ hb2 = n;
+  self::Hb<core::int> /* = core::int? */ hb3 = n;
+  self::Hb<core::int?> /* = core::int? */ hb4 = n;
+  self::Hb<core::int>? /* = core::int? */ hb5 = n;
+  self::Hb<core::int?>? /* = core::int? */ hb6 = n;
+  self::Hb<self::testHb::S%> /* = self::testHb::S? */ hb7 = n;
+  self::Hb<self::testHb::S%>? /* = self::testHb::S? */ hb8 = n;
+  self::Hb<self::testHb::S?> /* = self::testHb::S? */ hb9 = n;
+  self::Hb<self::testHb::S?>? /* = self::testHb::S? */ hb10 = n;
+  self::Hb<self::testHb::U> /* = self::testHb::U? */ hb11 = n;
+  self::Hb<self::testHb::U>? /* = self::testHb::U? */ hb12 = n;
+  self::Hb<self::testHb::U?> /* = self::testHb::U? */ hb13 = n;
+  self::Hb<self::testHb::U?>? /* = self::testHb::U? */ hb14 = n;
+}
+static method testHc<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Hc<dynamic> /* = dynamic */ hc1 = n;
+  self::Hc<dynamic>? /* = dynamic */ hc2 = n;
+  self::Hc<core::int> /* = core::int? */ hc3 = n;
+  self::Hc<core::int?> /* = core::int? */ hc4 = n;
+  self::Hc<core::int>? /* = core::int? */ hc5 = n;
+  self::Hc<core::int?>? /* = core::int? */ hc6 = n;
+  self::Hc<self::testHc::S%> /* = self::testHc::S? */ hc7 = n;
+  self::Hc<self::testHc::S%>? /* = self::testHc::S? */ hc8 = n;
+  self::Hc<self::testHc::S?> /* = self::testHc::S? */ hc9 = n;
+  self::Hc<self::testHc::S?>? /* = self::testHc::S? */ hc10 = n;
+  self::Hc<self::testHc::U> /* = self::testHc::U? */ hc11 = n;
+  self::Hc<self::testHc::U>? /* = self::testHc::U? */ hc12 = n;
+  self::Hc<self::testHc::U?> /* = self::testHc::U? */ hc13 = n;
+  self::Hc<self::testHc::U?>? /* = self::testHc::U? */ hc14 = n;
+}
+static method testI<U extends core::Object>(Never n) → dynamic {
+  self::I<core::Object> /* = core::Object */ i1 = n;
+  self::I<core::Object>? /* = core::Object? */ i2 = n;
+  self::I<core::int> /* = core::int */ i3 = n;
+  self::I<core::int>? /* = core::int? */ i5 = n;
+  self::I<self::testI::U> /* = self::testI::U */ i11 = n;
+  self::I<self::testI::U>? /* = self::testI::U? */ i12 = n;
+}
+static method testJa<U extends core::Object>(Never n) → dynamic {
+  self::Ja<core::Object> /* = core::Object */ ja1 = n;
+  self::Ja<core::Object>? /* = core::Object? */ ja2 = n;
+  self::Ja<core::int> /* = core::int */ ja3 = n;
+  self::Ja<core::int>? /* = core::int? */ ja5 = n;
+  self::Ja<self::testJa::U> /* = self::testJa::U */ ja11 = n;
+  self::Ja<self::testJa::U>? /* = self::testJa::U? */ ja12 = n;
+}
+static method testJc<U extends core::Object>(Never n) → dynamic {
+  self::Jc<core::Object> /* = core::Object? */ jc1 = n;
+  self::Jc<core::Object>? /* = core::Object? */ jc2 = n;
+  self::Jc<core::int> /* = core::int? */ jc3 = n;
+  self::Jc<core::int>? /* = core::int? */ jc5 = n;
+  self::Jc<self::testJc::U> /* = self::testJc::U? */ jc11 = n;
+  self::Jc<self::testJc::U>? /* = self::testJc::U? */ jc12 = n;
+}
+static method testK<U extends core::Object>(Never n) → dynamic {
+  self::K<core::Object> /* = core::Object? */ k1 = n;
+  self::K<core::Object>? /* = core::Object? */ k2 = n;
+  self::K<core::int> /* = core::int? */ k3 = n;
+  self::K<core::int>? /* = core::int? */ k5 = n;
+  self::K<self::testK::U> /* = self::testK::U? */ k11 = n;
+  self::K<self::testK::U>? /* = self::testK::U? */ k12 = n;
+}
+static method testLa<U extends core::Object>(Never n) → dynamic {
+  self::La<core::Object> /* = core::Object? */ la1 = n;
+  self::La<core::Object>? /* = core::Object? */ la2 = n;
+  self::La<core::int> /* = core::int? */ la3 = n;
+  self::La<core::int>? /* = core::int? */ la5 = n;
+  self::La<self::testLa::U> /* = self::testLa::U? */ la11 = n;
+  self::La<self::testLa::U>? /* = self::testLa::U? */ la12 = n;
+}
+static method testLc<U extends core::Object>(Never n) → dynamic {
+  self::Lc<core::Object> /* = core::Object? */ lc1 = n;
+  self::Lc<core::Object>? /* = core::Object? */ lc2 = n;
+  self::Lc<core::int> /* = core::int? */ lc3 = n;
+  self::Lc<core::int>? /* = core::int? */ lc5 = n;
+  self::Lc<self::testLc::U> /* = self::testLc::U? */ lc11 = n;
+  self::Lc<self::testLc::U>? /* = self::testLc::U? */ lc12 = n;
+}
diff --git a/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.strong.transformed.expect
new file mode 100644
index 00000000000..9dc182e4b45
--- /dev/null
+++ b/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.strong.transformed.expect
@@ -0,0 +1,400 @@
+library;
+import self as self;
+import "dart:core" as core;
+
+extension type A(core::int it) {
+  constructor • = self::A|;
+  tearoff • = self::A|_#new#tearOff;
+}
+extension type Ba(self::A /* = core::int */ it) {
+  constructor • = self::Ba|;
+  tearoff • = self::Ba|_#new#tearOff;
+}
+extension type Bb(self::A? /* = core::int? */ it) {
+  constructor • = self::Bb|;
+  tearoff • = self::Bb|_#new#tearOff;
+}
+extension type C<T extends core::Object? = dynamic>(T% it) {
+  constructor • = self::C|;
+  tearoff • = self::C|_#new#tearOff;
+}
+extension type Da<T extends core::Object? = dynamic>(self::C<T%> /* = T% */ it) {
+  constructor • = self::Da|;
+  tearoff • = self::Da|_#new#tearOff;
+}
+extension type Db<T extends core::Object? = dynamic>(self::C<T?> /* = T? */ it) {
+  constructor • = self::Db|;
+  tearoff • = self::Db|_#new#tearOff;
+}
+extension type Dc<T extends core::Object? = dynamic>(self::C<T%>? /* = T? */ it) {
+  constructor • = self::Dc|;
+  tearoff • = self::Dc|_#new#tearOff;
+}
+extension type E(core::int? it) {
+  constructor • = self::E|;
+  tearoff • = self::E|_#new#tearOff;
+}
+extension type Fa(self::E /* = core::int? */ it) {
+  constructor • = self::Fa|;
+  tearoff • = self::Fa|_#new#tearOff;
+}
+extension type Fb(self::E? /* = core::int? */ it) {
+  constructor • = self::Fb|;
+  tearoff • = self::Fb|_#new#tearOff;
+}
+extension type G<T extends core::Object? = dynamic>(T? it) {
+  constructor • = self::G|;
+  tearoff • = self::G|_#new#tearOff;
+}
+extension type Ha<T extends core::Object? = dynamic>(self::G<T%> /* = T? */ it) {
+  constructor • = self::Ha|;
+  tearoff • = self::Ha|_#new#tearOff;
+}
+extension type Hb<T extends core::Object? = dynamic>(self::G<T?> /* = T? */ it) {
+  constructor • = self::Hb|;
+  tearoff • = self::Hb|_#new#tearOff;
+}
+extension type Hc<T extends core::Object? = dynamic>(self::G<T%>? /* = T? */ it) {
+  constructor • = self::Hc|;
+  tearoff • = self::Hc|_#new#tearOff;
+}
+extension type I<T extends core::Object>(T it) {
+  constructor • = self::I|;
+  tearoff • = self::I|_#new#tearOff;
+}
+extension type Ja<T extends core::Object>(self::I<T> /* = T */ it) {
+  constructor • = self::Ja|;
+  tearoff • = self::Ja|_#new#tearOff;
+}
+extension type Jc<T extends core::Object>(self::I<T>? /* = T? */ it) {
+  constructor • = self::Jc|;
+  tearoff • = self::Jc|_#new#tearOff;
+}
+extension type K<T extends core::Object>(T? it) {
+  constructor • = self::K|;
+  tearoff • = self::K|_#new#tearOff;
+}
+extension type La<T extends core::Object>(self::K<T> /* = T? */ it) {
+  constructor • = self::La|;
+  tearoff • = self::La|_#new#tearOff;
+}
+extension type Lc<T extends core::Object>(self::K<T>? /* = T? */ it) {
+  constructor • = self::Lc|;
+  tearoff • = self::Lc|_#new#tearOff;
+}
+static inline-class-member method A|(dynamic it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
+  return #this;
+}
+static inline-class-member method A|_#new#tearOff(dynamic it) → self::A /* = core::int */
+  return self::A|(it);
+static inline-class-member method Ba|(dynamic it) → self::Ba /* = core::int */ {
+  lowered final self::Ba /* = core::int */ #this = it;
+  return #this;
+}
+static inline-class-member method Ba|_#new#tearOff(dynamic it) → self::Ba /* = core::int */
+  return self::Ba|(it);
+static inline-class-member method Bb|(dynamic it) → self::Bb /* = core::int? */ {
+  lowered final self::Bb /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method Bb|_#new#tearOff(dynamic it) → self::Bb /* = core::int? */
+  return self::Bb|(it);
+static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> /* = self::C|::T% */ {
+  lowered final self::C<self::C|::T%> /* = self::C|::T% */ #this = it;
+  return #this;
+}
+static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%> /* = self::C|_#new#tearOff::T% */
+  return self::C|<self::C|_#new#tearOff::T%>(it);
+static inline-class-member method Da|<T extends core::Object? = dynamic>(dynamic it) → self::Da<self::Da|::T%> /* = self::Da|::T% */ {
+  lowered final self::Da<self::Da|::T%> /* = self::Da|::T% */ #this = it;
+  return #this;
+}
+static inline-class-member method Da|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Da<self::Da|_#new#tearOff::T%> /* = self::Da|_#new#tearOff::T% */
+  return self::Da|<self::Da|_#new#tearOff::T%>(it);
+static inline-class-member method Db|<T extends core::Object? = dynamic>(dynamic it) → self::Db<self::Db|::T%> /* = self::Db|::T? */ {
+  lowered final self::Db<self::Db|::T%> /* = self::Db|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Db|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Db<self::Db|_#new#tearOff::T%> /* = self::Db|_#new#tearOff::T? */
+  return self::Db|<self::Db|_#new#tearOff::T%>(it);
+static inline-class-member method Dc|<T extends core::Object? = dynamic>(dynamic it) → self::Dc<self::Dc|::T%> /* = self::Dc|::T? */ {
+  lowered final self::Dc<self::Dc|::T%> /* = self::Dc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Dc|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Dc<self::Dc|_#new#tearOff::T%> /* = self::Dc|_#new#tearOff::T? */
+  return self::Dc|<self::Dc|_#new#tearOff::T%>(it);
+static inline-class-member method E|(dynamic it) → self::E /* = core::int? */ {
+  lowered final self::E /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = core::int? */
+  return self::E|(it);
+static inline-class-member method Fa|(dynamic it) → self::Fa /* = core::int? */ {
+  lowered final self::Fa /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method Fa|_#new#tearOff(dynamic it) → self::Fa /* = core::int? */
+  return self::Fa|(it);
+static inline-class-member method Fb|_#new#tearOff(dynamic it) → self::Fb /* = core::int? */
+  return self::Fb|(it);
+static inline-class-member method Fb|(dynamic it) → self::Fb /* = core::int? */ {
+  lowered final self::Fb /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method G|<T extends core::Object? = dynamic>(dynamic it) → self::G<self::G|::T%> /* = self::G|::T? */ {
+  lowered final self::G<self::G|::T%> /* = self::G|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method G|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::G<self::G|_#new#tearOff::T%> /* = self::G|_#new#tearOff::T? */
+  return self::G|<self::G|_#new#tearOff::T%>(it);
+static inline-class-member method Ha|<T extends core::Object? = dynamic>(dynamic it) → self::Ha<self::Ha|::T%> /* = self::Ha|::T? */ {
+  lowered final self::Ha<self::Ha|::T%> /* = self::Ha|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Ha|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Ha<self::Ha|_#new#tearOff::T%> /* = self::Ha|_#new#tearOff::T? */
+  return self::Ha|<self::Ha|_#new#tearOff::T%>(it);
+static inline-class-member method Hb|<T extends core::Object? = dynamic>(dynamic it) → self::Hb<self::Hb|::T%> /* = self::Hb|::T? */ {
+  lowered final self::Hb<self::Hb|::T%> /* = self::Hb|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Hb|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Hb<self::Hb|_#new#tearOff::T%> /* = self::Hb|_#new#tearOff::T? */
+  return self::Hb|<self::Hb|_#new#tearOff::T%>(it);
+static inline-class-member method Hc|<T extends core::Object? = dynamic>(dynamic it) → self::Hc<self::Hc|::T%> /* = self::Hc|::T? */ {
+  lowered final self::Hc<self::Hc|::T%> /* = self::Hc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Hc|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Hc<self::Hc|_#new#tearOff::T%> /* = self::Hc|_#new#tearOff::T? */
+  return self::Hc|<self::Hc|_#new#tearOff::T%>(it);
+static inline-class-member method I|<T extends core::Object = dynamic>(dynamic it) → self::I<self::I|::T> /* = self::I|::T */ {
+  lowered final self::I<self::I|::T> /* = self::I|::T */ #this = it;
+  return #this;
+}
+static inline-class-member method I|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::I<self::I|_#new#tearOff::T> /* = self::I|_#new#tearOff::T */
+  return self::I|<self::I|_#new#tearOff::T>(it);
+static inline-class-member method Ja|<T extends core::Object = dynamic>(dynamic it) → self::Ja<self::Ja|::T> /* = self::Ja|::T */ {
+  lowered final self::Ja<self::Ja|::T> /* = self::Ja|::T */ #this = it;
+  return #this;
+}
+static inline-class-member method Ja|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::Ja<self::Ja|_#new#tearOff::T> /* = self::Ja|_#new#tearOff::T */
+  return self::Ja|<self::Ja|_#new#tearOff::T>(it);
+static inline-class-member method Jc|<T extends core::Object = dynamic>(dynamic it) → self::Jc<self::Jc|::T> /* = self::Jc|::T? */ {
+  lowered final self::Jc<self::Jc|::T> /* = self::Jc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Jc|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::Jc<self::Jc|_#new#tearOff::T> /* = self::Jc|_#new#tearOff::T? */
+  return self::Jc|<self::Jc|_#new#tearOff::T>(it);
+static inline-class-member method K|<T extends core::Object = dynamic>(dynamic it) → self::K<self::K|::T> /* = self::K|::T? */ {
+  lowered final self::K<self::K|::T> /* = self::K|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method K|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::K<self::K|_#new#tearOff::T> /* = self::K|_#new#tearOff::T? */
+  return self::K|<self::K|_#new#tearOff::T>(it);
+static inline-class-member method La|<T extends core::Object = dynamic>(dynamic it) → self::La<self::La|::T> /* = self::La|::T? */ {
+  lowered final self::La<self::La|::T> /* = self::La|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method La|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::La<self::La|_#new#tearOff::T> /* = self::La|_#new#tearOff::T? */
+  return self::La|<self::La|_#new#tearOff::T>(it);
+static inline-class-member method Lc|<T extends core::Object = dynamic>(dynamic it) → self::Lc<self::Lc|::T> /* = self::Lc|::T? */ {
+  lowered final self::Lc<self::Lc|::T> /* = self::Lc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Lc|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::Lc<self::Lc|_#new#tearOff::T> /* = self::Lc|_#new#tearOff::T? */
+  return self::Lc|<self::Lc|_#new#tearOff::T>(it);
+static method testA(Never n) → dynamic {
+  self::A /* = core::int */ a1 = n;
+  self::A? /* = core::int? */ a2 = n;
+}
+static method testBa(Never n) → dynamic {
+  self::Ba /* = core::int */ ba1 = n;
+  self::Ba? /* = core::int? */ ba2 = n;
+  self::Bb /* = core::int? */ bb3 = n;
+  self::Bb? /* = core::int? */ bb4 = n;
+}
+static method testC<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::C<dynamic> /* = dynamic */ c1 = n;
+  self::C<dynamic>? /* = dynamic */ c2 = n;
+  self::C<core::int> /* = core::int */ c3 = n;
+  self::C<core::int?> /* = core::int? */ c4 = n;
+  self::C<core::int>? /* = core::int? */ c5 = n;
+  self::C<core::int?>? /* = core::int? */ c6 = n;
+  self::C<self::testC::S%> /* = self::testC::S% */ c7 = n;
+  self::C<self::testC::S%>? /* = self::testC::S? */ c8 = n;
+  self::C<self::testC::S?> /* = self::testC::S? */ c9 = n;
+  self::C<self::testC::S?>? /* = self::testC::S? */ c10 = n;
+  self::C<self::testC::U> /* = self::testC::U */ c11 = n;
+  self::C<self::testC::U>? /* = self::testC::U? */ c12 = n;
+  self::C<self::testC::U?> /* = self::testC::U? */ c13 = n;
+  self::C<self::testC::U?>? /* = self::testC::U? */ c14 = n;
+}
+static method testDa<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Da<dynamic> /* = dynamic */ da1 = n;
+  self::Da<dynamic>? /* = dynamic */ da2 = n;
+  self::Da<core::int> /* = core::int */ da3 = n;
+  self::Da<core::int?> /* = core::int? */ da4 = n;
+  self::Da<core::int>? /* = core::int? */ da5 = n;
+  self::Da<core::int?>? /* = core::int? */ da6 = n;
+  self::Da<self::testDa::S%> /* = self::testDa::S% */ da7 = n;
+  self::Da<self::testDa::S%>? /* = self::testDa::S? */ da8 = n;
+  self::Da<self::testDa::S?> /* = self::testDa::S? */ da9 = n;
+  self::Da<self::testDa::S?>? /* = self::testDa::S? */ da10 = n;
+  self::Da<self::testDa::U> /* = self::testDa::U */ da11 = n;
+  self::Da<self::testDa::U>? /* = self::testDa::U? */ da12 = n;
+  self::Da<self::testDa::U?> /* = self::testDa::U? */ da13 = n;
+  self::Da<self::testDa::U?>? /* = self::testDa::U? */ da14 = n;
+}
+static method testDb<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Db<dynamic> /* = dynamic */ db1 = n;
+  self::Db<dynamic>? /* = dynamic */ db2 = n;
+  self::Db<core::int> /* = core::int? */ db3 = n;
+  self::Db<core::int?> /* = core::int? */ db4 = n;
+  self::Db<core::int>? /* = core::int? */ db5 = n;
+  self::Db<core::int?>? /* = core::int? */ db6 = n;
+  self::Db<self::testDb::S%> /* = self::testDb::S? */ db7 = n;
+  self::Db<self::testDb::S%>? /* = self::testDb::S? */ db8 = n;
+  self::Db<self::testDb::S?> /* = self::testDb::S? */ db9 = n;
+  self::Db<self::testDb::S?>? /* = self::testDb::S? */ db10 = n;
+  self::Db<self::testDb::U> /* = self::testDb::U? */ db11 = n;
+  self::Db<self::testDb::U>? /* = self::testDb::U? */ db12 = n;
+  self::Db<self::testDb::U?> /* = self::testDb::U? */ db13 = n;
+  self::Db<self::testDb::U?>? /* = self::testDb::U? */ db14 = n;
+}
+static method testDc<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Dc<dynamic> /* = dynamic */ dc1 = n;
+  self::Dc<dynamic>? /* = dynamic */ dc2 = n;
+  self::Dc<core::int> /* = core::int? */ dc3 = n;
+  self::Dc<core::int?> /* = core::int? */ dc4 = n;
+  self::Dc<core::int>? /* = core::int? */ dc5 = n;
+  self::Dc<core::int?>? /* = core::int? */ dc6 = n;
+  self::Dc<self::testDc::S%> /* = self::testDc::S? */ dc7 = n;
+  self::Dc<self::testDc::S%>? /* = self::testDc::S? */ dc8 = n;
+  self::Dc<self::testDc::S?> /* = self::testDc::S? */ dc9 = n;
+  self::Dc<self::testDc::S?>? /* = self::testDc::S? */ dc10 = n;
+  self::Dc<self::testDc::U> /* = self::testDc::U? */ dc11 = n;
+  self::Dc<self::testDc::U>? /* = self::testDc::U? */ dc12 = n;
+  self::Dc<self::testDc::U?> /* = self::testDc::U? */ dc13 = n;
+  self::Dc<self::testDc::U?>? /* = self::testDc::U? */ dc14 = n;
+}
+static method testE(Never n) → dynamic {
+  self::E /* = core::int? */ e1 = n;
+  self::E? /* = core::int? */ e2 = n;
+}
+static method testF(Never n) → dynamic {
+  self::Fa /* = core::int? */ fa1 = n;
+  self::Fa? /* = core::int? */ fa2 = n;
+  self::Fb /* = core::int? */ fb3 = n;
+  self::Fb? /* = core::int? */ fb4 = n;
+}
+static method testG<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::G<dynamic> /* = dynamic */ g1 = n;
+  self::G<dynamic>? /* = dynamic */ g2 = n;
+  self::G<core::int> /* = core::int? */ g3 = n;
+  self::G<core::int?> /* = core::int? */ g4 = n;
+  self::G<core::int>? /* = core::int? */ g5 = n;
+  self::G<core::int?>? /* = core::int? */ g6 = n;
+  self::G<self::testG::S%> /* = self::testG::S? */ g7 = n;
+  self::G<self::testG::S%>? /* = self::testG::S? */ g8 = n;
+  self::G<self::testG::S?> /* = self::testG::S? */ g9 = n;
+  self::G<self::testG::S?>? /* = self::testG::S? */ g10 = n;
+  self::G<self::testG::U> /* = self::testG::U? */ g11 = n;
+  self::G<self::testG::U>? /* = self::testG::U? */ g12 = n;
+  self::G<self::testG::U?> /* = self::testG::U? */ g13 = n;
+  self::G<self::testG::U?>? /* = self::testG::U? */ g14 = n;
+}
+static method testHa<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Ha<dynamic> /* = dynamic */ ha1 = n;
+  self::Ha<dynamic>? /* = dynamic */ ha2 = n;
+  self::Ha<core::int> /* = core::int? */ ha3 = n;
+  self::Ha<core::int?> /* = core::int? */ ha4 = n;
+  self::Ha<core::int>? /* = core::int? */ ha5 = n;
+  self::Ha<core::int?>? /* = core::int? */ ha6 = n;
+  self::Ha<self::testHa::S%> /* = self::testHa::S? */ ha7 = n;
+  self::Ha<self::testHa::S%>? /* = self::testHa::S? */ ha8 = n;
+  self::Ha<self::testHa::S?> /* = self::testHa::S? */ ha9 = n;
+  self::Ha<self::testHa::S?>? /* = self::testHa::S? */ ha10 = n;
+  self::Ha<self::testHa::U> /* = self::testHa::U? */ ha11 = n;
+  self::Ha<self::testHa::U>? /* = self::testHa::U? */ ha12 = n;
+  self::Ha<self::testHa::U?> /* = self::testHa::U? */ ha13 = n;
+  self::Ha<self::testHa::U?>? /* = self::testHa::U? */ ha14 = n;
+}
+static method testHb<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Hb<dynamic> /* = dynamic */ hb1 = n;
+  self::Hb<dynamic>? /* = dynamic */ hb2 = n;
+  self::Hb<core::int> /* = core::int? */ hb3 = n;
+  self::Hb<core::int?> /* = core::int? */ hb4 = n;
+  self::Hb<core::int>? /* = core::int? */ hb5 = n;
+  self::Hb<core::int?>? /* = core::int? */ hb6 = n;
+  self::Hb<self::testHb::S%> /* = self::testHb::S? */ hb7 = n;
+  self::Hb<self::testHb::S%>? /* = self::testHb::S? */ hb8 = n;
+  self::Hb<self::testHb::S?> /* = self::testHb::S? */ hb9 = n;
+  self::Hb<self::testHb::S?>? /* = self::testHb::S? */ hb10 = n;
+  self::Hb<self::testHb::U> /* = self::testHb::U? */ hb11 = n;
+  self::Hb<self::testHb::U>? /* = self::testHb::U? */ hb12 = n;
+  self::Hb<self::testHb::U?> /* = self::testHb::U? */ hb13 = n;
+  self::Hb<self::testHb::U?>? /* = self::testHb::U? */ hb14 = n;
+}
+static method testHc<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Hc<dynamic> /* = dynamic */ hc1 = n;
+  self::Hc<dynamic>? /* = dynamic */ hc2 = n;
+  self::Hc<core::int> /* = core::int? */ hc3 = n;
+  self::Hc<core::int?> /* = core::int? */ hc4 = n;
+  self::Hc<core::int>? /* = core::int? */ hc5 = n;
+  self::Hc<core::int?>? /* = core::int? */ hc6 = n;
+  self::Hc<self::testHc::S%> /* = self::testHc::S? */ hc7 = n;
+  self::Hc<self::testHc::S%>? /* = self::testHc::S? */ hc8 = n;
+  self::Hc<self::testHc::S?> /* = self::testHc::S? */ hc9 = n;
+  self::Hc<self::testHc::S?>? /* = self::testHc::S? */ hc10 = n;
+  self::Hc<self::testHc::U> /* = self::testHc::U? */ hc11 = n;
+  self::Hc<self::testHc::U>? /* = self::testHc::U? */ hc12 = n;
+  self::Hc<self::testHc::U?> /* = self::testHc::U? */ hc13 = n;
+  self::Hc<self::testHc::U?>? /* = self::testHc::U? */ hc14 = n;
+}
+static method testI<U extends core::Object>(Never n) → dynamic {
+  self::I<core::Object> /* = core::Object */ i1 = n;
+  self::I<core::Object>? /* = core::Object? */ i2 = n;
+  self::I<core::int> /* = core::int */ i3 = n;
+  self::I<core::int>? /* = core::int? */ i5 = n;
+  self::I<self::testI::U> /* = self::testI::U */ i11 = n;
+  self::I<self::testI::U>? /* = self::testI::U? */ i12 = n;
+}
+static method testJa<U extends core::Object>(Never n) → dynamic {
+  self::Ja<core::Object> /* = core::Object */ ja1 = n;
+  self::Ja<core::Object>? /* = core::Object? */ ja2 = n;
+  self::Ja<core::int> /* = core::int */ ja3 = n;
+  self::Ja<core::int>? /* = core::int? */ ja5 = n;
+  self::Ja<self::testJa::U> /* = self::testJa::U */ ja11 = n;
+  self::Ja<self::testJa::U>? /* = self::testJa::U? */ ja12 = n;
+}
+static method testJc<U extends core::Object>(Never n) → dynamic {
+  self::Jc<core::Object> /* = core::Object? */ jc1 = n;
+  self::Jc<core::Object>? /* = core::Object? */ jc2 = n;
+  self::Jc<core::int> /* = core::int? */ jc3 = n;
+  self::Jc<core::int>? /* = core::int? */ jc5 = n;
+  self::Jc<self::testJc::U> /* = self::testJc::U? */ jc11 = n;
+  self::Jc<self::testJc::U>? /* = self::testJc::U? */ jc12 = n;
+}
+static method testK<U extends core::Object>(Never n) → dynamic {
+  self::K<core::Object> /* = core::Object? */ k1 = n;
+  self::K<core::Object>? /* = core::Object? */ k2 = n;
+  self::K<core::int> /* = core::int? */ k3 = n;
+  self::K<core::int>? /* = core::int? */ k5 = n;
+  self::K<self::testK::U> /* = self::testK::U? */ k11 = n;
+  self::K<self::testK::U>? /* = self::testK::U? */ k12 = n;
+}
+static method testLa<U extends core::Object>(Never n) → dynamic {
+  self::La<core::Object> /* = core::Object? */ la1 = n;
+  self::La<core::Object>? /* = core::Object? */ la2 = n;
+  self::La<core::int> /* = core::int? */ la3 = n;
+  self::La<core::int>? /* = core::int? */ la5 = n;
+  self::La<self::testLa::U> /* = self::testLa::U? */ la11 = n;
+  self::La<self::testLa::U>? /* = self::testLa::U? */ la12 = n;
+}
+static method testLc<U extends core::Object>(Never n) → dynamic {
+  self::Lc<core::Object> /* = core::Object? */ lc1 = n;
+  self::Lc<core::Object>? /* = core::Object? */ lc2 = n;
+  self::Lc<core::int> /* = core::int? */ lc3 = n;
+  self::Lc<core::int>? /* = core::int? */ lc5 = n;
+  self::Lc<self::testLc::U> /* = self::testLc::U? */ lc11 = n;
+  self::Lc<self::testLc::U>? /* = self::testLc::U? */ lc12 = n;
+}
diff --git a/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.textual_outline.expect b/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.textual_outline.expect
new file mode 100644
index 00000000000..4779297254d
--- /dev/null
+++ b/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.textual_outline.expect
@@ -0,0 +1,19 @@
+extension type A(int it) {} extension type Ba(A it) {} extension type Bb(A? it) {} extension type C<T>(T it) {} extension type Da<T>(C<T> it) {} extension type Db<T>(C<T?> it) {} extension type Dc<T>(C<T>? it) {} extension type E(int? it) {} extension type Fa(E it) {} extension type Fb(E? it) {} extension type G<T>(T? it) {} extension type Ha<T>(G<T> it) {} extension type Hb<T>(G<T?> it) {} extension type Hc<T>(G<T>? it) {} extension type I<T extends Object>(T it) {} extension type Ja<T extends Object>(I<T> it) {} extension type Jc<T extends Object>(I<T>? it) {} extension type K<T extends Object>(T? it) {} extension type La<T extends Object>(K<T> it) {} extension type Lc<T extends Object>(K<T>? it) {}
+testA(Never n) {}
+testBa(Never n) {}
+testC<S, U extends Object>(Never n) {}
+testDa<S, U extends Object>(Never n) {}
+testDb<S, U extends Object>(Never n) {}
+testDc<S, U extends Object>(Never n) {}
+testE(Never n) {}
+testF(Never n) {}
+testG<S, U extends Object>(Never n) {}
+testHa<S, U extends Object>(Never n) {}
+testHb<S, U extends Object>(Never n) {}
+testHc<S, U extends Object>(Never n) {}
+testI<U extends Object>(Never n) {}
+testJa<U extends Object>(Never n) {}
+testJc<U extends Object>(Never n) {}
+testK<U extends Object>(Never n) {}
+testLa<U extends Object>(Never n) {}
+testLc<U extends Object>(Never n) {}
diff --git a/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.weak.expect
new file mode 100644
index 00000000000..22240934913
--- /dev/null
+++ b/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.weak.expect
@@ -0,0 +1,401 @@
+library;
+import self as self;
+import "dart:core" as core;
+import "dart:_internal" as _in;
+
+extension type A(core::int it) {
+  constructor • = self::A|;
+  tearoff • = self::A|_#new#tearOff;
+}
+extension type Ba(self::A /* = core::int */ it) {
+  constructor • = self::Ba|;
+  tearoff • = self::Ba|_#new#tearOff;
+}
+extension type Bb(self::A? /* = core::int? */ it) {
+  constructor • = self::Bb|;
+  tearoff • = self::Bb|_#new#tearOff;
+}
+extension type C<T extends core::Object? = dynamic>(T% it) {
+  constructor • = self::C|;
+  tearoff • = self::C|_#new#tearOff;
+}
+extension type Da<T extends core::Object? = dynamic>(self::C<T%> /* = T% */ it) {
+  constructor • = self::Da|;
+  tearoff • = self::Da|_#new#tearOff;
+}
+extension type Db<T extends core::Object? = dynamic>(self::C<T?> /* = T? */ it) {
+  constructor • = self::Db|;
+  tearoff • = self::Db|_#new#tearOff;
+}
+extension type Dc<T extends core::Object? = dynamic>(self::C<T%>? /* = T? */ it) {
+  constructor • = self::Dc|;
+  tearoff • = self::Dc|_#new#tearOff;
+}
+extension type E(core::int? it) {
+  constructor • = self::E|;
+  tearoff • = self::E|_#new#tearOff;
+}
+extension type Fa(self::E /* = core::int? */ it) {
+  constructor • = self::Fa|;
+  tearoff • = self::Fa|_#new#tearOff;
+}
+extension type Fb(self::E? /* = core::int? */ it) {
+  constructor • = self::Fb|;
+  tearoff • = self::Fb|_#new#tearOff;
+}
+extension type G<T extends core::Object? = dynamic>(T? it) {
+  constructor • = self::G|;
+  tearoff • = self::G|_#new#tearOff;
+}
+extension type Ha<T extends core::Object? = dynamic>(self::G<T%> /* = T? */ it) {
+  constructor • = self::Ha|;
+  tearoff • = self::Ha|_#new#tearOff;
+}
+extension type Hb<T extends core::Object? = dynamic>(self::G<T?> /* = T? */ it) {
+  constructor • = self::Hb|;
+  tearoff • = self::Hb|_#new#tearOff;
+}
+extension type Hc<T extends core::Object? = dynamic>(self::G<T%>? /* = T? */ it) {
+  constructor • = self::Hc|;
+  tearoff • = self::Hc|_#new#tearOff;
+}
+extension type I<T extends core::Object>(T it) {
+  constructor • = self::I|;
+  tearoff • = self::I|_#new#tearOff;
+}
+extension type Ja<T extends core::Object>(self::I<T> /* = T */ it) {
+  constructor • = self::Ja|;
+  tearoff • = self::Ja|_#new#tearOff;
+}
+extension type Jc<T extends core::Object>(self::I<T>? /* = T? */ it) {
+  constructor • = self::Jc|;
+  tearoff • = self::Jc|_#new#tearOff;
+}
+extension type K<T extends core::Object>(T? it) {
+  constructor • = self::K|;
+  tearoff • = self::K|_#new#tearOff;
+}
+extension type La<T extends core::Object>(self::K<T> /* = T? */ it) {
+  constructor • = self::La|;
+  tearoff • = self::La|_#new#tearOff;
+}
+extension type Lc<T extends core::Object>(self::K<T>? /* = T? */ it) {
+  constructor • = self::Lc|;
+  tearoff • = self::Lc|_#new#tearOff;
+}
+static inline-class-member method A|(dynamic it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
+  return #this;
+}
+static inline-class-member method A|_#new#tearOff(dynamic it) → self::A /* = core::int */
+  return self::A|(it);
+static inline-class-member method Ba|(dynamic it) → self::Ba /* = core::int */ {
+  lowered final self::Ba /* = core::int */ #this = it;
+  return #this;
+}
+static inline-class-member method Ba|_#new#tearOff(dynamic it) → self::Ba /* = core::int */
+  return self::Ba|(it);
+static inline-class-member method Bb|(dynamic it) → self::Bb /* = core::int? */ {
+  lowered final self::Bb /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method Bb|_#new#tearOff(dynamic it) → self::Bb /* = core::int? */
+  return self::Bb|(it);
+static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> /* = self::C|::T% */ {
+  lowered final self::C<self::C|::T%> /* = self::C|::T% */ #this = it;
+  return #this;
+}
+static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%> /* = self::C|_#new#tearOff::T% */
+  return self::C|<self::C|_#new#tearOff::T%>(it);
+static inline-class-member method Da|<T extends core::Object? = dynamic>(dynamic it) → self::Da<self::Da|::T%> /* = self::Da|::T% */ {
+  lowered final self::Da<self::Da|::T%> /* = self::Da|::T% */ #this = it;
+  return #this;
+}
+static inline-class-member method Da|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Da<self::Da|_#new#tearOff::T%> /* = self::Da|_#new#tearOff::T% */
+  return self::Da|<self::Da|_#new#tearOff::T%>(it);
+static inline-class-member method Db|<T extends core::Object? = dynamic>(dynamic it) → self::Db<self::Db|::T%> /* = self::Db|::T? */ {
+  lowered final self::Db<self::Db|::T%> /* = self::Db|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Db|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Db<self::Db|_#new#tearOff::T%> /* = self::Db|_#new#tearOff::T? */
+  return self::Db|<self::Db|_#new#tearOff::T%>(it);
+static inline-class-member method Dc|<T extends core::Object? = dynamic>(dynamic it) → self::Dc<self::Dc|::T%> /* = self::Dc|::T? */ {
+  lowered final self::Dc<self::Dc|::T%> /* = self::Dc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Dc|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Dc<self::Dc|_#new#tearOff::T%> /* = self::Dc|_#new#tearOff::T? */
+  return self::Dc|<self::Dc|_#new#tearOff::T%>(it);
+static inline-class-member method E|(dynamic it) → self::E /* = core::int? */ {
+  lowered final self::E /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = core::int? */
+  return self::E|(it);
+static inline-class-member method Fa|(dynamic it) → self::Fa /* = core::int? */ {
+  lowered final self::Fa /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method Fa|_#new#tearOff(dynamic it) → self::Fa /* = core::int? */
+  return self::Fa|(it);
+static inline-class-member method Fb|_#new#tearOff(dynamic it) → self::Fb /* = core::int? */
+  return self::Fb|(it);
+static inline-class-member method Fb|(dynamic it) → self::Fb /* = core::int? */ {
+  lowered final self::Fb /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method G|<T extends core::Object? = dynamic>(dynamic it) → self::G<self::G|::T%> /* = self::G|::T? */ {
+  lowered final self::G<self::G|::T%> /* = self::G|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method G|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::G<self::G|_#new#tearOff::T%> /* = self::G|_#new#tearOff::T? */
+  return self::G|<self::G|_#new#tearOff::T%>(it);
+static inline-class-member method Ha|<T extends core::Object? = dynamic>(dynamic it) → self::Ha<self::Ha|::T%> /* = self::Ha|::T? */ {
+  lowered final self::Ha<self::Ha|::T%> /* = self::Ha|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Ha|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Ha<self::Ha|_#new#tearOff::T%> /* = self::Ha|_#new#tearOff::T? */
+  return self::Ha|<self::Ha|_#new#tearOff::T%>(it);
+static inline-class-member method Hb|<T extends core::Object? = dynamic>(dynamic it) → self::Hb<self::Hb|::T%> /* = self::Hb|::T? */ {
+  lowered final self::Hb<self::Hb|::T%> /* = self::Hb|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Hb|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Hb<self::Hb|_#new#tearOff::T%> /* = self::Hb|_#new#tearOff::T? */
+  return self::Hb|<self::Hb|_#new#tearOff::T%>(it);
+static inline-class-member method Hc|<T extends core::Object? = dynamic>(dynamic it) → self::Hc<self::Hc|::T%> /* = self::Hc|::T? */ {
+  lowered final self::Hc<self::Hc|::T%> /* = self::Hc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Hc|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Hc<self::Hc|_#new#tearOff::T%> /* = self::Hc|_#new#tearOff::T? */
+  return self::Hc|<self::Hc|_#new#tearOff::T%>(it);
+static inline-class-member method I|<T extends core::Object = dynamic>(dynamic it) → self::I<self::I|::T> /* = self::I|::T */ {
+  lowered final self::I<self::I|::T> /* = self::I|::T */ #this = it;
+  return #this;
+}
+static inline-class-member method I|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::I<self::I|_#new#tearOff::T> /* = self::I|_#new#tearOff::T */
+  return self::I|<self::I|_#new#tearOff::T>(it);
+static inline-class-member method Ja|<T extends core::Object = dynamic>(dynamic it) → self::Ja<self::Ja|::T> /* = self::Ja|::T */ {
+  lowered final self::Ja<self::Ja|::T> /* = self::Ja|::T */ #this = it;
+  return #this;
+}
+static inline-class-member method Ja|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::Ja<self::Ja|_#new#tearOff::T> /* = self::Ja|_#new#tearOff::T */
+  return self::Ja|<self::Ja|_#new#tearOff::T>(it);
+static inline-class-member method Jc|<T extends core::Object = dynamic>(dynamic it) → self::Jc<self::Jc|::T> /* = self::Jc|::T? */ {
+  lowered final self::Jc<self::Jc|::T> /* = self::Jc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Jc|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::Jc<self::Jc|_#new#tearOff::T> /* = self::Jc|_#new#tearOff::T? */
+  return self::Jc|<self::Jc|_#new#tearOff::T>(it);
+static inline-class-member method K|<T extends core::Object = dynamic>(dynamic it) → self::K<self::K|::T> /* = self::K|::T? */ {
+  lowered final self::K<self::K|::T> /* = self::K|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method K|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::K<self::K|_#new#tearOff::T> /* = self::K|_#new#tearOff::T? */
+  return self::K|<self::K|_#new#tearOff::T>(it);
+static inline-class-member method La|<T extends core::Object = dynamic>(dynamic it) → self::La<self::La|::T> /* = self::La|::T? */ {
+  lowered final self::La<self::La|::T> /* = self::La|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method La|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::La<self::La|_#new#tearOff::T> /* = self::La|_#new#tearOff::T? */
+  return self::La|<self::La|_#new#tearOff::T>(it);
+static inline-class-member method Lc|<T extends core::Object = dynamic>(dynamic it) → self::Lc<self::Lc|::T> /* = self::Lc|::T? */ {
+  lowered final self::Lc<self::Lc|::T> /* = self::Lc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Lc|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::Lc<self::Lc|_#new#tearOff::T> /* = self::Lc|_#new#tearOff::T? */
+  return self::Lc|<self::Lc|_#new#tearOff::T>(it);
+static method testA(Never n) → dynamic {
+  self::A /* = core::int */ a1 = let final Never #t1 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::A? /* = core::int? */ a2 = let final Never #t2 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testBa(Never n) → dynamic {
+  self::Ba /* = core::int */ ba1 = let final Never #t3 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ba? /* = core::int? */ ba2 = let final Never #t4 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Bb /* = core::int? */ bb3 = let final Never #t5 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Bb? /* = core::int? */ bb4 = let final Never #t6 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testC<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::C<dynamic> /* = dynamic */ c1 = let final Never #t7 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<dynamic>? /* = dynamic */ c2 = let final Never #t8 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<core::int> /* = core::int */ c3 = let final Never #t9 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<core::int?> /* = core::int? */ c4 = let final Never #t10 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<core::int>? /* = core::int? */ c5 = let final Never #t11 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<core::int?>? /* = core::int? */ c6 = let final Never #t12 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::S%> /* = self::testC::S% */ c7 = let final Never #t13 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::S%>? /* = self::testC::S? */ c8 = let final Never #t14 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::S?> /* = self::testC::S? */ c9 = let final Never #t15 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::S?>? /* = self::testC::S? */ c10 = let final Never #t16 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::U> /* = self::testC::U */ c11 = let final Never #t17 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::U>? /* = self::testC::U? */ c12 = let final Never #t18 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::U?> /* = self::testC::U? */ c13 = let final Never #t19 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::U?>? /* = self::testC::U? */ c14 = let final Never #t20 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testDa<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Da<dynamic> /* = dynamic */ da1 = let final Never #t21 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<dynamic>? /* = dynamic */ da2 = let final Never #t22 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<core::int> /* = core::int */ da3 = let final Never #t23 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<core::int?> /* = core::int? */ da4 = let final Never #t24 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<core::int>? /* = core::int? */ da5 = let final Never #t25 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<core::int?>? /* = core::int? */ da6 = let final Never #t26 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::S%> /* = self::testDa::S% */ da7 = let final Never #t27 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::S%>? /* = self::testDa::S? */ da8 = let final Never #t28 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::S?> /* = self::testDa::S? */ da9 = let final Never #t29 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::S?>? /* = self::testDa::S? */ da10 = let final Never #t30 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::U> /* = self::testDa::U */ da11 = let final Never #t31 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::U>? /* = self::testDa::U? */ da12 = let final Never #t32 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::U?> /* = self::testDa::U? */ da13 = let final Never #t33 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::U?>? /* = self::testDa::U? */ da14 = let final Never #t34 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testDb<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Db<dynamic> /* = dynamic */ db1 = let final Never #t35 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<dynamic>? /* = dynamic */ db2 = let final Never #t36 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<core::int> /* = core::int? */ db3 = let final Never #t37 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<core::int?> /* = core::int? */ db4 = let final Never #t38 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<core::int>? /* = core::int? */ db5 = let final Never #t39 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<core::int?>? /* = core::int? */ db6 = let final Never #t40 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::S%> /* = self::testDb::S? */ db7 = let final Never #t41 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::S%>? /* = self::testDb::S? */ db8 = let final Never #t42 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::S?> /* = self::testDb::S? */ db9 = let final Never #t43 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::S?>? /* = self::testDb::S? */ db10 = let final Never #t44 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::U> /* = self::testDb::U? */ db11 = let final Never #t45 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::U>? /* = self::testDb::U? */ db12 = let final Never #t46 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::U?> /* = self::testDb::U? */ db13 = let final Never #t47 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::U?>? /* = self::testDb::U? */ db14 = let final Never #t48 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testDc<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Dc<dynamic> /* = dynamic */ dc1 = let final Never #t49 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<dynamic>? /* = dynamic */ dc2 = let final Never #t50 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<core::int> /* = core::int? */ dc3 = let final Never #t51 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<core::int?> /* = core::int? */ dc4 = let final Never #t52 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<core::int>? /* = core::int? */ dc5 = let final Never #t53 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<core::int?>? /* = core::int? */ dc6 = let final Never #t54 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::S%> /* = self::testDc::S? */ dc7 = let final Never #t55 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::S%>? /* = self::testDc::S? */ dc8 = let final Never #t56 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::S?> /* = self::testDc::S? */ dc9 = let final Never #t57 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::S?>? /* = self::testDc::S? */ dc10 = let final Never #t58 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::U> /* = self::testDc::U? */ dc11 = let final Never #t59 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::U>? /* = self::testDc::U? */ dc12 = let final Never #t60 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::U?> /* = self::testDc::U? */ dc13 = let final Never #t61 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::U?>? /* = self::testDc::U? */ dc14 = let final Never #t62 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testE(Never n) → dynamic {
+  self::E /* = core::int? */ e1 = let final Never #t63 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::E? /* = core::int? */ e2 = let final Never #t64 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testF(Never n) → dynamic {
+  self::Fa /* = core::int? */ fa1 = let final Never #t65 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Fa? /* = core::int? */ fa2 = let final Never #t66 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Fb /* = core::int? */ fb3 = let final Never #t67 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Fb? /* = core::int? */ fb4 = let final Never #t68 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testG<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::G<dynamic> /* = dynamic */ g1 = let final Never #t69 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<dynamic>? /* = dynamic */ g2 = let final Never #t70 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<core::int> /* = core::int? */ g3 = let final Never #t71 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<core::int?> /* = core::int? */ g4 = let final Never #t72 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<core::int>? /* = core::int? */ g5 = let final Never #t73 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<core::int?>? /* = core::int? */ g6 = let final Never #t74 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::S%> /* = self::testG::S? */ g7 = let final Never #t75 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::S%>? /* = self::testG::S? */ g8 = let final Never #t76 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::S?> /* = self::testG::S? */ g9 = let final Never #t77 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::S?>? /* = self::testG::S? */ g10 = let final Never #t78 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::U> /* = self::testG::U? */ g11 = let final Never #t79 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::U>? /* = self::testG::U? */ g12 = let final Never #t80 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::U?> /* = self::testG::U? */ g13 = let final Never #t81 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::U?>? /* = self::testG::U? */ g14 = let final Never #t82 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testHa<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Ha<dynamic> /* = dynamic */ ha1 = let final Never #t83 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<dynamic>? /* = dynamic */ ha2 = let final Never #t84 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<core::int> /* = core::int? */ ha3 = let final Never #t85 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<core::int?> /* = core::int? */ ha4 = let final Never #t86 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<core::int>? /* = core::int? */ ha5 = let final Never #t87 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<core::int?>? /* = core::int? */ ha6 = let final Never #t88 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::S%> /* = self::testHa::S? */ ha7 = let final Never #t89 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::S%>? /* = self::testHa::S? */ ha8 = let final Never #t90 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::S?> /* = self::testHa::S? */ ha9 = let final Never #t91 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::S?>? /* = self::testHa::S? */ ha10 = let final Never #t92 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::U> /* = self::testHa::U? */ ha11 = let final Never #t93 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::U>? /* = self::testHa::U? */ ha12 = let final Never #t94 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::U?> /* = self::testHa::U? */ ha13 = let final Never #t95 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::U?>? /* = self::testHa::U? */ ha14 = let final Never #t96 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testHb<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Hb<dynamic> /* = dynamic */ hb1 = let final Never #t97 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<dynamic>? /* = dynamic */ hb2 = let final Never #t98 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<core::int> /* = core::int? */ hb3 = let final Never #t99 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<core::int?> /* = core::int? */ hb4 = let final Never #t100 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<core::int>? /* = core::int? */ hb5 = let final Never #t101 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<core::int?>? /* = core::int? */ hb6 = let final Never #t102 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::S%> /* = self::testHb::S? */ hb7 = let final Never #t103 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::S%>? /* = self::testHb::S? */ hb8 = let final Never #t104 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::S?> /* = self::testHb::S? */ hb9 = let final Never #t105 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::S?>? /* = self::testHb::S? */ hb10 = let final Never #t106 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::U> /* = self::testHb::U? */ hb11 = let final Never #t107 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::U>? /* = self::testHb::U? */ hb12 = let final Never #t108 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::U?> /* = self::testHb::U? */ hb13 = let final Never #t109 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::U?>? /* = self::testHb::U? */ hb14 = let final Never #t110 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testHc<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Hc<dynamic> /* = dynamic */ hc1 = let final Never #t111 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<dynamic>? /* = dynamic */ hc2 = let final Never #t112 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<core::int> /* = core::int? */ hc3 = let final Never #t113 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<core::int?> /* = core::int? */ hc4 = let final Never #t114 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<core::int>? /* = core::int? */ hc5 = let final Never #t115 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<core::int?>? /* = core::int? */ hc6 = let final Never #t116 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::S%> /* = self::testHc::S? */ hc7 = let final Never #t117 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::S%>? /* = self::testHc::S? */ hc8 = let final Never #t118 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::S?> /* = self::testHc::S? */ hc9 = let final Never #t119 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::S?>? /* = self::testHc::S? */ hc10 = let final Never #t120 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::U> /* = self::testHc::U? */ hc11 = let final Never #t121 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::U>? /* = self::testHc::U? */ hc12 = let final Never #t122 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::U?> /* = self::testHc::U? */ hc13 = let final Never #t123 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::U?>? /* = self::testHc::U? */ hc14 = let final Never #t124 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testI<U extends core::Object>(Never n) → dynamic {
+  self::I<core::Object> /* = core::Object */ i1 = let final Never #t125 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::I<core::Object>? /* = core::Object? */ i2 = let final Never #t126 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::I<core::int> /* = core::int */ i3 = let final Never #t127 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::I<core::int>? /* = core::int? */ i5 = let final Never #t128 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::I<self::testI::U> /* = self::testI::U */ i11 = let final Never #t129 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::I<self::testI::U>? /* = self::testI::U? */ i12 = let final Never #t130 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testJa<U extends core::Object>(Never n) → dynamic {
+  self::Ja<core::Object> /* = core::Object */ ja1 = let final Never #t131 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ja<core::Object>? /* = core::Object? */ ja2 = let final Never #t132 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ja<core::int> /* = core::int */ ja3 = let final Never #t133 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ja<core::int>? /* = core::int? */ ja5 = let final Never #t134 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ja<self::testJa::U> /* = self::testJa::U */ ja11 = let final Never #t135 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ja<self::testJa::U>? /* = self::testJa::U? */ ja12 = let final Never #t136 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testJc<U extends core::Object>(Never n) → dynamic {
+  self::Jc<core::Object> /* = core::Object? */ jc1 = let final Never #t137 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Jc<core::Object>? /* = core::Object? */ jc2 = let final Never #t138 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Jc<core::int> /* = core::int? */ jc3 = let final Never #t139 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Jc<core::int>? /* = core::int? */ jc5 = let final Never #t140 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Jc<self::testJc::U> /* = self::testJc::U? */ jc11 = let final Never #t141 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Jc<self::testJc::U>? /* = self::testJc::U? */ jc12 = let final Never #t142 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testK<U extends core::Object>(Never n) → dynamic {
+  self::K<core::Object> /* = core::Object? */ k1 = let final Never #t143 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::K<core::Object>? /* = core::Object? */ k2 = let final Never #t144 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::K<core::int> /* = core::int? */ k3 = let final Never #t145 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::K<core::int>? /* = core::int? */ k5 = let final Never #t146 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::K<self::testK::U> /* = self::testK::U? */ k11 = let final Never #t147 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::K<self::testK::U>? /* = self::testK::U? */ k12 = let final Never #t148 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testLa<U extends core::Object>(Never n) → dynamic {
+  self::La<core::Object> /* = core::Object? */ la1 = let final Never #t149 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::La<core::Object>? /* = core::Object? */ la2 = let final Never #t150 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::La<core::int> /* = core::int? */ la3 = let final Never #t151 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::La<core::int>? /* = core::int? */ la5 = let final Never #t152 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::La<self::testLa::U> /* = self::testLa::U? */ la11 = let final Never #t153 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::La<self::testLa::U>? /* = self::testLa::U? */ la12 = let final Never #t154 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testLc<U extends core::Object>(Never n) → dynamic {
+  self::Lc<core::Object> /* = core::Object? */ lc1 = let final Never #t155 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Lc<core::Object>? /* = core::Object? */ lc2 = let final Never #t156 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Lc<core::int> /* = core::int? */ lc3 = let final Never #t157 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Lc<core::int>? /* = core::int? */ lc5 = let final Never #t158 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Lc<self::testLc::U> /* = self::testLc::U? */ lc11 = let final Never #t159 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Lc<self::testLc::U>? /* = self::testLc::U? */ lc12 = let final Never #t160 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
diff --git a/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.weak.modular.expect
new file mode 100644
index 00000000000..22240934913
--- /dev/null
+++ b/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.weak.modular.expect
@@ -0,0 +1,401 @@
+library;
+import self as self;
+import "dart:core" as core;
+import "dart:_internal" as _in;
+
+extension type A(core::int it) {
+  constructor • = self::A|;
+  tearoff • = self::A|_#new#tearOff;
+}
+extension type Ba(self::A /* = core::int */ it) {
+  constructor • = self::Ba|;
+  tearoff • = self::Ba|_#new#tearOff;
+}
+extension type Bb(self::A? /* = core::int? */ it) {
+  constructor • = self::Bb|;
+  tearoff • = self::Bb|_#new#tearOff;
+}
+extension type C<T extends core::Object? = dynamic>(T% it) {
+  constructor • = self::C|;
+  tearoff • = self::C|_#new#tearOff;
+}
+extension type Da<T extends core::Object? = dynamic>(self::C<T%> /* = T% */ it) {
+  constructor • = self::Da|;
+  tearoff • = self::Da|_#new#tearOff;
+}
+extension type Db<T extends core::Object? = dynamic>(self::C<T?> /* = T? */ it) {
+  constructor • = self::Db|;
+  tearoff • = self::Db|_#new#tearOff;
+}
+extension type Dc<T extends core::Object? = dynamic>(self::C<T%>? /* = T? */ it) {
+  constructor • = self::Dc|;
+  tearoff • = self::Dc|_#new#tearOff;
+}
+extension type E(core::int? it) {
+  constructor • = self::E|;
+  tearoff • = self::E|_#new#tearOff;
+}
+extension type Fa(self::E /* = core::int? */ it) {
+  constructor • = self::Fa|;
+  tearoff • = self::Fa|_#new#tearOff;
+}
+extension type Fb(self::E? /* = core::int? */ it) {
+  constructor • = self::Fb|;
+  tearoff • = self::Fb|_#new#tearOff;
+}
+extension type G<T extends core::Object? = dynamic>(T? it) {
+  constructor • = self::G|;
+  tearoff • = self::G|_#new#tearOff;
+}
+extension type Ha<T extends core::Object? = dynamic>(self::G<T%> /* = T? */ it) {
+  constructor • = self::Ha|;
+  tearoff • = self::Ha|_#new#tearOff;
+}
+extension type Hb<T extends core::Object? = dynamic>(self::G<T?> /* = T? */ it) {
+  constructor • = self::Hb|;
+  tearoff • = self::Hb|_#new#tearOff;
+}
+extension type Hc<T extends core::Object? = dynamic>(self::G<T%>? /* = T? */ it) {
+  constructor • = self::Hc|;
+  tearoff • = self::Hc|_#new#tearOff;
+}
+extension type I<T extends core::Object>(T it) {
+  constructor • = self::I|;
+  tearoff • = self::I|_#new#tearOff;
+}
+extension type Ja<T extends core::Object>(self::I<T> /* = T */ it) {
+  constructor • = self::Ja|;
+  tearoff • = self::Ja|_#new#tearOff;
+}
+extension type Jc<T extends core::Object>(self::I<T>? /* = T? */ it) {
+  constructor • = self::Jc|;
+  tearoff • = self::Jc|_#new#tearOff;
+}
+extension type K<T extends core::Object>(T? it) {
+  constructor • = self::K|;
+  tearoff • = self::K|_#new#tearOff;
+}
+extension type La<T extends core::Object>(self::K<T> /* = T? */ it) {
+  constructor • = self::La|;
+  tearoff • = self::La|_#new#tearOff;
+}
+extension type Lc<T extends core::Object>(self::K<T>? /* = T? */ it) {
+  constructor • = self::Lc|;
+  tearoff • = self::Lc|_#new#tearOff;
+}
+static inline-class-member method A|(dynamic it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
+  return #this;
+}
+static inline-class-member method A|_#new#tearOff(dynamic it) → self::A /* = core::int */
+  return self::A|(it);
+static inline-class-member method Ba|(dynamic it) → self::Ba /* = core::int */ {
+  lowered final self::Ba /* = core::int */ #this = it;
+  return #this;
+}
+static inline-class-member method Ba|_#new#tearOff(dynamic it) → self::Ba /* = core::int */
+  return self::Ba|(it);
+static inline-class-member method Bb|(dynamic it) → self::Bb /* = core::int? */ {
+  lowered final self::Bb /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method Bb|_#new#tearOff(dynamic it) → self::Bb /* = core::int? */
+  return self::Bb|(it);
+static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> /* = self::C|::T% */ {
+  lowered final self::C<self::C|::T%> /* = self::C|::T% */ #this = it;
+  return #this;
+}
+static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%> /* = self::C|_#new#tearOff::T% */
+  return self::C|<self::C|_#new#tearOff::T%>(it);
+static inline-class-member method Da|<T extends core::Object? = dynamic>(dynamic it) → self::Da<self::Da|::T%> /* = self::Da|::T% */ {
+  lowered final self::Da<self::Da|::T%> /* = self::Da|::T% */ #this = it;
+  return #this;
+}
+static inline-class-member method Da|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Da<self::Da|_#new#tearOff::T%> /* = self::Da|_#new#tearOff::T% */
+  return self::Da|<self::Da|_#new#tearOff::T%>(it);
+static inline-class-member method Db|<T extends core::Object? = dynamic>(dynamic it) → self::Db<self::Db|::T%> /* = self::Db|::T? */ {
+  lowered final self::Db<self::Db|::T%> /* = self::Db|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Db|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Db<self::Db|_#new#tearOff::T%> /* = self::Db|_#new#tearOff::T? */
+  return self::Db|<self::Db|_#new#tearOff::T%>(it);
+static inline-class-member method Dc|<T extends core::Object? = dynamic>(dynamic it) → self::Dc<self::Dc|::T%> /* = self::Dc|::T? */ {
+  lowered final self::Dc<self::Dc|::T%> /* = self::Dc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Dc|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Dc<self::Dc|_#new#tearOff::T%> /* = self::Dc|_#new#tearOff::T? */
+  return self::Dc|<self::Dc|_#new#tearOff::T%>(it);
+static inline-class-member method E|(dynamic it) → self::E /* = core::int? */ {
+  lowered final self::E /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = core::int? */
+  return self::E|(it);
+static inline-class-member method Fa|(dynamic it) → self::Fa /* = core::int? */ {
+  lowered final self::Fa /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method Fa|_#new#tearOff(dynamic it) → self::Fa /* = core::int? */
+  return self::Fa|(it);
+static inline-class-member method Fb|_#new#tearOff(dynamic it) → self::Fb /* = core::int? */
+  return self::Fb|(it);
+static inline-class-member method Fb|(dynamic it) → self::Fb /* = core::int? */ {
+  lowered final self::Fb /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method G|<T extends core::Object? = dynamic>(dynamic it) → self::G<self::G|::T%> /* = self::G|::T? */ {
+  lowered final self::G<self::G|::T%> /* = self::G|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method G|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::G<self::G|_#new#tearOff::T%> /* = self::G|_#new#tearOff::T? */
+  return self::G|<self::G|_#new#tearOff::T%>(it);
+static inline-class-member method Ha|<T extends core::Object? = dynamic>(dynamic it) → self::Ha<self::Ha|::T%> /* = self::Ha|::T? */ {
+  lowered final self::Ha<self::Ha|::T%> /* = self::Ha|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Ha|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Ha<self::Ha|_#new#tearOff::T%> /* = self::Ha|_#new#tearOff::T? */
+  return self::Ha|<self::Ha|_#new#tearOff::T%>(it);
+static inline-class-member method Hb|<T extends core::Object? = dynamic>(dynamic it) → self::Hb<self::Hb|::T%> /* = self::Hb|::T? */ {
+  lowered final self::Hb<self::Hb|::T%> /* = self::Hb|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Hb|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Hb<self::Hb|_#new#tearOff::T%> /* = self::Hb|_#new#tearOff::T? */
+  return self::Hb|<self::Hb|_#new#tearOff::T%>(it);
+static inline-class-member method Hc|<T extends core::Object? = dynamic>(dynamic it) → self::Hc<self::Hc|::T%> /* = self::Hc|::T? */ {
+  lowered final self::Hc<self::Hc|::T%> /* = self::Hc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Hc|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Hc<self::Hc|_#new#tearOff::T%> /* = self::Hc|_#new#tearOff::T? */
+  return self::Hc|<self::Hc|_#new#tearOff::T%>(it);
+static inline-class-member method I|<T extends core::Object = dynamic>(dynamic it) → self::I<self::I|::T> /* = self::I|::T */ {
+  lowered final self::I<self::I|::T> /* = self::I|::T */ #this = it;
+  return #this;
+}
+static inline-class-member method I|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::I<self::I|_#new#tearOff::T> /* = self::I|_#new#tearOff::T */
+  return self::I|<self::I|_#new#tearOff::T>(it);
+static inline-class-member method Ja|<T extends core::Object = dynamic>(dynamic it) → self::Ja<self::Ja|::T> /* = self::Ja|::T */ {
+  lowered final self::Ja<self::Ja|::T> /* = self::Ja|::T */ #this = it;
+  return #this;
+}
+static inline-class-member method Ja|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::Ja<self::Ja|_#new#tearOff::T> /* = self::Ja|_#new#tearOff::T */
+  return self::Ja|<self::Ja|_#new#tearOff::T>(it);
+static inline-class-member method Jc|<T extends core::Object = dynamic>(dynamic it) → self::Jc<self::Jc|::T> /* = self::Jc|::T? */ {
+  lowered final self::Jc<self::Jc|::T> /* = self::Jc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Jc|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::Jc<self::Jc|_#new#tearOff::T> /* = self::Jc|_#new#tearOff::T? */
+  return self::Jc|<self::Jc|_#new#tearOff::T>(it);
+static inline-class-member method K|<T extends core::Object = dynamic>(dynamic it) → self::K<self::K|::T> /* = self::K|::T? */ {
+  lowered final self::K<self::K|::T> /* = self::K|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method K|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::K<self::K|_#new#tearOff::T> /* = self::K|_#new#tearOff::T? */
+  return self::K|<self::K|_#new#tearOff::T>(it);
+static inline-class-member method La|<T extends core::Object = dynamic>(dynamic it) → self::La<self::La|::T> /* = self::La|::T? */ {
+  lowered final self::La<self::La|::T> /* = self::La|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method La|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::La<self::La|_#new#tearOff::T> /* = self::La|_#new#tearOff::T? */
+  return self::La|<self::La|_#new#tearOff::T>(it);
+static inline-class-member method Lc|<T extends core::Object = dynamic>(dynamic it) → self::Lc<self::Lc|::T> /* = self::Lc|::T? */ {
+  lowered final self::Lc<self::Lc|::T> /* = self::Lc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Lc|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::Lc<self::Lc|_#new#tearOff::T> /* = self::Lc|_#new#tearOff::T? */
+  return self::Lc|<self::Lc|_#new#tearOff::T>(it);
+static method testA(Never n) → dynamic {
+  self::A /* = core::int */ a1 = let final Never #t1 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::A? /* = core::int? */ a2 = let final Never #t2 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testBa(Never n) → dynamic {
+  self::Ba /* = core::int */ ba1 = let final Never #t3 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ba? /* = core::int? */ ba2 = let final Never #t4 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Bb /* = core::int? */ bb3 = let final Never #t5 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Bb? /* = core::int? */ bb4 = let final Never #t6 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testC<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::C<dynamic> /* = dynamic */ c1 = let final Never #t7 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<dynamic>? /* = dynamic */ c2 = let final Never #t8 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<core::int> /* = core::int */ c3 = let final Never #t9 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<core::int?> /* = core::int? */ c4 = let final Never #t10 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<core::int>? /* = core::int? */ c5 = let final Never #t11 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<core::int?>? /* = core::int? */ c6 = let final Never #t12 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::S%> /* = self::testC::S% */ c7 = let final Never #t13 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::S%>? /* = self::testC::S? */ c8 = let final Never #t14 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::S?> /* = self::testC::S? */ c9 = let final Never #t15 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::S?>? /* = self::testC::S? */ c10 = let final Never #t16 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::U> /* = self::testC::U */ c11 = let final Never #t17 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::U>? /* = self::testC::U? */ c12 = let final Never #t18 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::U?> /* = self::testC::U? */ c13 = let final Never #t19 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::U?>? /* = self::testC::U? */ c14 = let final Never #t20 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testDa<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Da<dynamic> /* = dynamic */ da1 = let final Never #t21 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<dynamic>? /* = dynamic */ da2 = let final Never #t22 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<core::int> /* = core::int */ da3 = let final Never #t23 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<core::int?> /* = core::int? */ da4 = let final Never #t24 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<core::int>? /* = core::int? */ da5 = let final Never #t25 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<core::int?>? /* = core::int? */ da6 = let final Never #t26 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::S%> /* = self::testDa::S% */ da7 = let final Never #t27 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::S%>? /* = self::testDa::S? */ da8 = let final Never #t28 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::S?> /* = self::testDa::S? */ da9 = let final Never #t29 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::S?>? /* = self::testDa::S? */ da10 = let final Never #t30 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::U> /* = self::testDa::U */ da11 = let final Never #t31 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::U>? /* = self::testDa::U? */ da12 = let final Never #t32 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::U?> /* = self::testDa::U? */ da13 = let final Never #t33 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::U?>? /* = self::testDa::U? */ da14 = let final Never #t34 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testDb<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Db<dynamic> /* = dynamic */ db1 = let final Never #t35 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<dynamic>? /* = dynamic */ db2 = let final Never #t36 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<core::int> /* = core::int? */ db3 = let final Never #t37 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<core::int?> /* = core::int? */ db4 = let final Never #t38 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<core::int>? /* = core::int? */ db5 = let final Never #t39 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<core::int?>? /* = core::int? */ db6 = let final Never #t40 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::S%> /* = self::testDb::S? */ db7 = let final Never #t41 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::S%>? /* = self::testDb::S? */ db8 = let final Never #t42 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::S?> /* = self::testDb::S? */ db9 = let final Never #t43 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::S?>? /* = self::testDb::S? */ db10 = let final Never #t44 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::U> /* = self::testDb::U? */ db11 = let final Never #t45 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::U>? /* = self::testDb::U? */ db12 = let final Never #t46 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::U?> /* = self::testDb::U? */ db13 = let final Never #t47 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::U?>? /* = self::testDb::U? */ db14 = let final Never #t48 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testDc<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Dc<dynamic> /* = dynamic */ dc1 = let final Never #t49 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<dynamic>? /* = dynamic */ dc2 = let final Never #t50 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<core::int> /* = core::int? */ dc3 = let final Never #t51 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<core::int?> /* = core::int? */ dc4 = let final Never #t52 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<core::int>? /* = core::int? */ dc5 = let final Never #t53 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<core::int?>? /* = core::int? */ dc6 = let final Never #t54 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::S%> /* = self::testDc::S? */ dc7 = let final Never #t55 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::S%>? /* = self::testDc::S? */ dc8 = let final Never #t56 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::S?> /* = self::testDc::S? */ dc9 = let final Never #t57 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::S?>? /* = self::testDc::S? */ dc10 = let final Never #t58 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::U> /* = self::testDc::U? */ dc11 = let final Never #t59 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::U>? /* = self::testDc::U? */ dc12 = let final Never #t60 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::U?> /* = self::testDc::U? */ dc13 = let final Never #t61 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::U?>? /* = self::testDc::U? */ dc14 = let final Never #t62 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testE(Never n) → dynamic {
+  self::E /* = core::int? */ e1 = let final Never #t63 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::E? /* = core::int? */ e2 = let final Never #t64 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testF(Never n) → dynamic {
+  self::Fa /* = core::int? */ fa1 = let final Never #t65 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Fa? /* = core::int? */ fa2 = let final Never #t66 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Fb /* = core::int? */ fb3 = let final Never #t67 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Fb? /* = core::int? */ fb4 = let final Never #t68 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testG<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::G<dynamic> /* = dynamic */ g1 = let final Never #t69 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<dynamic>? /* = dynamic */ g2 = let final Never #t70 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<core::int> /* = core::int? */ g3 = let final Never #t71 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<core::int?> /* = core::int? */ g4 = let final Never #t72 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<core::int>? /* = core::int? */ g5 = let final Never #t73 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<core::int?>? /* = core::int? */ g6 = let final Never #t74 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::S%> /* = self::testG::S? */ g7 = let final Never #t75 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::S%>? /* = self::testG::S? */ g8 = let final Never #t76 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::S?> /* = self::testG::S? */ g9 = let final Never #t77 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::S?>? /* = self::testG::S? */ g10 = let final Never #t78 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::U> /* = self::testG::U? */ g11 = let final Never #t79 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::U>? /* = self::testG::U? */ g12 = let final Never #t80 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::U?> /* = self::testG::U? */ g13 = let final Never #t81 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::U?>? /* = self::testG::U? */ g14 = let final Never #t82 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testHa<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Ha<dynamic> /* = dynamic */ ha1 = let final Never #t83 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<dynamic>? /* = dynamic */ ha2 = let final Never #t84 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<core::int> /* = core::int? */ ha3 = let final Never #t85 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<core::int?> /* = core::int? */ ha4 = let final Never #t86 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<core::int>? /* = core::int? */ ha5 = let final Never #t87 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<core::int?>? /* = core::int? */ ha6 = let final Never #t88 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::S%> /* = self::testHa::S? */ ha7 = let final Never #t89 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::S%>? /* = self::testHa::S? */ ha8 = let final Never #t90 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::S?> /* = self::testHa::S? */ ha9 = let final Never #t91 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::S?>? /* = self::testHa::S? */ ha10 = let final Never #t92 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::U> /* = self::testHa::U? */ ha11 = let final Never #t93 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::U>? /* = self::testHa::U? */ ha12 = let final Never #t94 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::U?> /* = self::testHa::U? */ ha13 = let final Never #t95 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::U?>? /* = self::testHa::U? */ ha14 = let final Never #t96 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testHb<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Hb<dynamic> /* = dynamic */ hb1 = let final Never #t97 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<dynamic>? /* = dynamic */ hb2 = let final Never #t98 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<core::int> /* = core::int? */ hb3 = let final Never #t99 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<core::int?> /* = core::int? */ hb4 = let final Never #t100 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<core::int>? /* = core::int? */ hb5 = let final Never #t101 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<core::int?>? /* = core::int? */ hb6 = let final Never #t102 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::S%> /* = self::testHb::S? */ hb7 = let final Never #t103 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::S%>? /* = self::testHb::S? */ hb8 = let final Never #t104 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::S?> /* = self::testHb::S? */ hb9 = let final Never #t105 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::S?>? /* = self::testHb::S? */ hb10 = let final Never #t106 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::U> /* = self::testHb::U? */ hb11 = let final Never #t107 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::U>? /* = self::testHb::U? */ hb12 = let final Never #t108 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::U?> /* = self::testHb::U? */ hb13 = let final Never #t109 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::U?>? /* = self::testHb::U? */ hb14 = let final Never #t110 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testHc<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Hc<dynamic> /* = dynamic */ hc1 = let final Never #t111 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<dynamic>? /* = dynamic */ hc2 = let final Never #t112 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<core::int> /* = core::int? */ hc3 = let final Never #t113 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<core::int?> /* = core::int? */ hc4 = let final Never #t114 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<core::int>? /* = core::int? */ hc5 = let final Never #t115 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<core::int?>? /* = core::int? */ hc6 = let final Never #t116 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::S%> /* = self::testHc::S? */ hc7 = let final Never #t117 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::S%>? /* = self::testHc::S? */ hc8 = let final Never #t118 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::S?> /* = self::testHc::S? */ hc9 = let final Never #t119 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::S?>? /* = self::testHc::S? */ hc10 = let final Never #t120 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::U> /* = self::testHc::U? */ hc11 = let final Never #t121 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::U>? /* = self::testHc::U? */ hc12 = let final Never #t122 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::U?> /* = self::testHc::U? */ hc13 = let final Never #t123 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::U?>? /* = self::testHc::U? */ hc14 = let final Never #t124 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testI<U extends core::Object>(Never n) → dynamic {
+  self::I<core::Object> /* = core::Object */ i1 = let final Never #t125 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::I<core::Object>? /* = core::Object? */ i2 = let final Never #t126 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::I<core::int> /* = core::int */ i3 = let final Never #t127 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::I<core::int>? /* = core::int? */ i5 = let final Never #t128 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::I<self::testI::U> /* = self::testI::U */ i11 = let final Never #t129 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::I<self::testI::U>? /* = self::testI::U? */ i12 = let final Never #t130 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testJa<U extends core::Object>(Never n) → dynamic {
+  self::Ja<core::Object> /* = core::Object */ ja1 = let final Never #t131 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ja<core::Object>? /* = core::Object? */ ja2 = let final Never #t132 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ja<core::int> /* = core::int */ ja3 = let final Never #t133 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ja<core::int>? /* = core::int? */ ja5 = let final Never #t134 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ja<self::testJa::U> /* = self::testJa::U */ ja11 = let final Never #t135 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ja<self::testJa::U>? /* = self::testJa::U? */ ja12 = let final Never #t136 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testJc<U extends core::Object>(Never n) → dynamic {
+  self::Jc<core::Object> /* = core::Object? */ jc1 = let final Never #t137 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Jc<core::Object>? /* = core::Object? */ jc2 = let final Never #t138 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Jc<core::int> /* = core::int? */ jc3 = let final Never #t139 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Jc<core::int>? /* = core::int? */ jc5 = let final Never #t140 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Jc<self::testJc::U> /* = self::testJc::U? */ jc11 = let final Never #t141 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Jc<self::testJc::U>? /* = self::testJc::U? */ jc12 = let final Never #t142 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testK<U extends core::Object>(Never n) → dynamic {
+  self::K<core::Object> /* = core::Object? */ k1 = let final Never #t143 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::K<core::Object>? /* = core::Object? */ k2 = let final Never #t144 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::K<core::int> /* = core::int? */ k3 = let final Never #t145 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::K<core::int>? /* = core::int? */ k5 = let final Never #t146 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::K<self::testK::U> /* = self::testK::U? */ k11 = let final Never #t147 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::K<self::testK::U>? /* = self::testK::U? */ k12 = let final Never #t148 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testLa<U extends core::Object>(Never n) → dynamic {
+  self::La<core::Object> /* = core::Object? */ la1 = let final Never #t149 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::La<core::Object>? /* = core::Object? */ la2 = let final Never #t150 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::La<core::int> /* = core::int? */ la3 = let final Never #t151 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::La<core::int>? /* = core::int? */ la5 = let final Never #t152 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::La<self::testLa::U> /* = self::testLa::U? */ la11 = let final Never #t153 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::La<self::testLa::U>? /* = self::testLa::U? */ la12 = let final Never #t154 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testLc<U extends core::Object>(Never n) → dynamic {
+  self::Lc<core::Object> /* = core::Object? */ lc1 = let final Never #t155 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Lc<core::Object>? /* = core::Object? */ lc2 = let final Never #t156 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Lc<core::int> /* = core::int? */ lc3 = let final Never #t157 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Lc<core::int>? /* = core::int? */ lc5 = let final Never #t158 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Lc<self::testLc::U> /* = self::testLc::U? */ lc11 = let final Never #t159 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Lc<self::testLc::U>? /* = self::testLc::U? */ lc12 = let final Never #t160 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
diff --git a/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.weak.outline.expect
new file mode 100644
index 00000000000..2186e202422
--- /dev/null
+++ b/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.weak.outline.expect
@@ -0,0 +1,200 @@
+library;
+import self as self;
+import "dart:core" as core;
+
+extension type A(core::int it) {
+  constructor • = self::A|;
+  tearoff • = self::A|_#new#tearOff;
+}
+extension type Ba(self::A /* = core::int */ it) {
+  constructor • = self::Ba|;
+  tearoff • = self::Ba|_#new#tearOff;
+}
+extension type Bb(self::A? /* = core::int? */ it) {
+  constructor • = self::Bb|;
+  tearoff • = self::Bb|_#new#tearOff;
+}
+extension type C<T extends core::Object? = dynamic>(T% it) {
+  constructor • = self::C|;
+  tearoff • = self::C|_#new#tearOff;
+}
+extension type Da<T extends core::Object? = dynamic>(self::C<T%> /* = T% */ it) {
+  constructor • = self::Da|;
+  tearoff • = self::Da|_#new#tearOff;
+}
+extension type Db<T extends core::Object? = dynamic>(self::C<T?> /* = T? */ it) {
+  constructor • = self::Db|;
+  tearoff • = self::Db|_#new#tearOff;
+}
+extension type Dc<T extends core::Object? = dynamic>(self::C<T%>? /* = T? */ it) {
+  constructor • = self::Dc|;
+  tearoff • = self::Dc|_#new#tearOff;
+}
+extension type E(core::int? it) {
+  constructor • = self::E|;
+  tearoff • = self::E|_#new#tearOff;
+}
+extension type Fa(self::E /* = core::int? */ it) {
+  constructor • = self::Fa|;
+  tearoff • = self::Fa|_#new#tearOff;
+}
+extension type Fb(self::E? /* = core::int? */ it) {
+  constructor • = self::Fb|;
+  tearoff • = self::Fb|_#new#tearOff;
+}
+extension type G<T extends core::Object? = dynamic>(T? it) {
+  constructor • = self::G|;
+  tearoff • = self::G|_#new#tearOff;
+}
+extension type Ha<T extends core::Object? = dynamic>(self::G<T%> /* = T? */ it) {
+  constructor • = self::Ha|;
+  tearoff • = self::Ha|_#new#tearOff;
+}
+extension type Hb<T extends core::Object? = dynamic>(self::G<T?> /* = T? */ it) {
+  constructor • = self::Hb|;
+  tearoff • = self::Hb|_#new#tearOff;
+}
+extension type Hc<T extends core::Object? = dynamic>(self::G<T%>? /* = T? */ it) {
+  constructor • = self::Hc|;
+  tearoff • = self::Hc|_#new#tearOff;
+}
+extension type I<T extends core::Object>(T it) {
+  constructor • = self::I|;
+  tearoff • = self::I|_#new#tearOff;
+}
+extension type Ja<T extends core::Object>(self::I<T> /* = T */ it) {
+  constructor • = self::Ja|;
+  tearoff • = self::Ja|_#new#tearOff;
+}
+extension type Jc<T extends core::Object>(self::I<T>? /* = T? */ it) {
+  constructor • = self::Jc|;
+  tearoff • = self::Jc|_#new#tearOff;
+}
+extension type K<T extends core::Object>(T? it) {
+  constructor • = self::K|;
+  tearoff • = self::K|_#new#tearOff;
+}
+extension type La<T extends core::Object>(self::K<T> /* = T? */ it) {
+  constructor • = self::La|;
+  tearoff • = self::La|_#new#tearOff;
+}
+extension type Lc<T extends core::Object>(self::K<T>? /* = T? */ it) {
+  constructor • = self::Lc|;
+  tearoff • = self::Lc|_#new#tearOff;
+}
+static inline-class-member method A|(dynamic it) → self::A /* = core::int */
+  ;
+static inline-class-member method A|_#new#tearOff(dynamic it) → self::A /* = core::int */
+  return self::A|(it);
+static inline-class-member method Ba|(dynamic it) → self::Ba /* = core::int */
+  ;
+static inline-class-member method Ba|_#new#tearOff(dynamic it) → self::Ba /* = core::int */
+  return self::Ba|(it);
+static inline-class-member method Bb|(dynamic it) → self::Bb /* = core::int? */
+  ;
+static inline-class-member method Bb|_#new#tearOff(dynamic it) → self::Bb /* = core::int? */
+  return self::Bb|(it);
+static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> /* = self::C|::T% */
+  ;
+static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%> /* = self::C|_#new#tearOff::T% */
+  return self::C|<self::C|_#new#tearOff::T%>(it);
+static inline-class-member method Da|<T extends core::Object? = dynamic>(dynamic it) → self::Da<self::Da|::T%> /* = self::Da|::T% */
+  ;
+static inline-class-member method Da|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Da<self::Da|_#new#tearOff::T%> /* = self::Da|_#new#tearOff::T% */
+  return self::Da|<self::Da|_#new#tearOff::T%>(it);
+static inline-class-member method Db|<T extends core::Object? = dynamic>(dynamic it) → self::Db<self::Db|::T%> /* = self::Db|::T? */
+  ;
+static inline-class-member method Db|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Db<self::Db|_#new#tearOff::T%> /* = self::Db|_#new#tearOff::T? */
+  return self::Db|<self::Db|_#new#tearOff::T%>(it);
+static inline-class-member method Dc|<T extends core::Object? = dynamic>(dynamic it) → self::Dc<self::Dc|::T%> /* = self::Dc|::T? */
+  ;
+static inline-class-member method Dc|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Dc<self::Dc|_#new#tearOff::T%> /* = self::Dc|_#new#tearOff::T? */
+  return self::Dc|<self::Dc|_#new#tearOff::T%>(it);
+static inline-class-member method E|(dynamic it) → self::E /* = core::int? */
+  ;
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = core::int? */
+  return self::E|(it);
+static inline-class-member method Fa|(dynamic it) → self::Fa /* = core::int? */
+  ;
+static inline-class-member method Fa|_#new#tearOff(dynamic it) → self::Fa /* = core::int? */
+  return self::Fa|(it);
+static inline-class-member method Fb|_#new#tearOff(dynamic it) → self::Fb /* = core::int? */
+  return self::Fb|(it);
+static inline-class-member method Fb|(dynamic it) → self::Fb /* = core::int? */
+  ;
+static inline-class-member method G|<T extends core::Object? = dynamic>(dynamic it) → self::G<self::G|::T%> /* = self::G|::T? */
+  ;
+static inline-class-member method G|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::G<self::G|_#new#tearOff::T%> /* = self::G|_#new#tearOff::T? */
+  return self::G|<self::G|_#new#tearOff::T%>(it);
+static inline-class-member method Ha|<T extends core::Object? = dynamic>(dynamic it) → self::Ha<self::Ha|::T%> /* = self::Ha|::T? */
+  ;
+static inline-class-member method Ha|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Ha<self::Ha|_#new#tearOff::T%> /* = self::Ha|_#new#tearOff::T? */
+  return self::Ha|<self::Ha|_#new#tearOff::T%>(it);
+static inline-class-member method Hb|<T extends core::Object? = dynamic>(dynamic it) → self::Hb<self::Hb|::T%> /* = self::Hb|::T? */
+  ;
+static inline-class-member method Hb|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Hb<self::Hb|_#new#tearOff::T%> /* = self::Hb|_#new#tearOff::T? */
+  return self::Hb|<self::Hb|_#new#tearOff::T%>(it);
+static inline-class-member method Hc|<T extends core::Object? = dynamic>(dynamic it) → self::Hc<self::Hc|::T%> /* = self::Hc|::T? */
+  ;
+static inline-class-member method Hc|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Hc<self::Hc|_#new#tearOff::T%> /* = self::Hc|_#new#tearOff::T? */
+  return self::Hc|<self::Hc|_#new#tearOff::T%>(it);
+static inline-class-member method I|<T extends core::Object = dynamic>(dynamic it) → self::I<self::I|::T> /* = self::I|::T */
+  ;
+static inline-class-member method I|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::I<self::I|_#new#tearOff::T> /* = self::I|_#new#tearOff::T */
+  return self::I|<self::I|_#new#tearOff::T>(it);
+static inline-class-member method Ja|<T extends core::Object = dynamic>(dynamic it) → self::Ja<self::Ja|::T> /* = self::Ja|::T */
+  ;
+static inline-class-member method Ja|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::Ja<self::Ja|_#new#tearOff::T> /* = self::Ja|_#new#tearOff::T */
+  return self::Ja|<self::Ja|_#new#tearOff::T>(it);
+static inline-class-member method Jc|<T extends core::Object = dynamic>(dynamic it) → self::Jc<self::Jc|::T> /* = self::Jc|::T? */
+  ;
+static inline-class-member method Jc|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::Jc<self::Jc|_#new#tearOff::T> /* = self::Jc|_#new#tearOff::T? */
+  return self::Jc|<self::Jc|_#new#tearOff::T>(it);
+static inline-class-member method K|<T extends core::Object = dynamic>(dynamic it) → self::K<self::K|::T> /* = self::K|::T? */
+  ;
+static inline-class-member method K|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::K<self::K|_#new#tearOff::T> /* = self::K|_#new#tearOff::T? */
+  return self::K|<self::K|_#new#tearOff::T>(it);
+static inline-class-member method La|<T extends core::Object = dynamic>(dynamic it) → self::La<self::La|::T> /* = self::La|::T? */
+  ;
+static inline-class-member method La|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::La<self::La|_#new#tearOff::T> /* = self::La|_#new#tearOff::T? */
+  return self::La|<self::La|_#new#tearOff::T>(it);
+static inline-class-member method Lc|<T extends core::Object = dynamic>(dynamic it) → self::Lc<self::Lc|::T> /* = self::Lc|::T? */
+  ;
+static inline-class-member method Lc|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::Lc<self::Lc|_#new#tearOff::T> /* = self::Lc|_#new#tearOff::T? */
+  return self::Lc|<self::Lc|_#new#tearOff::T>(it);
+static method testA(Never n) → dynamic
+  ;
+static method testBa(Never n) → dynamic
+  ;
+static method testC<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic
+  ;
+static method testDa<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic
+  ;
+static method testDb<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic
+  ;
+static method testDc<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic
+  ;
+static method testE(Never n) → dynamic
+  ;
+static method testF(Never n) → dynamic
+  ;
+static method testG<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic
+  ;
+static method testHa<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic
+  ;
+static method testHb<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic
+  ;
+static method testHc<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic
+  ;
+static method testI<U extends core::Object>(Never n) → dynamic
+  ;
+static method testJa<U extends core::Object>(Never n) → dynamic
+  ;
+static method testJc<U extends core::Object>(Never n) → dynamic
+  ;
+static method testK<U extends core::Object>(Never n) → dynamic
+  ;
+static method testLa<U extends core::Object>(Never n) → dynamic
+  ;
+static method testLc<U extends core::Object>(Never n) → dynamic
+  ;
diff --git a/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.weak.transformed.expect
new file mode 100644
index 00000000000..22240934913
--- /dev/null
+++ b/pkg/front_end/testcases/inline_class/extension_types/representation_type.dart.weak.transformed.expect
@@ -0,0 +1,401 @@
+library;
+import self as self;
+import "dart:core" as core;
+import "dart:_internal" as _in;
+
+extension type A(core::int it) {
+  constructor • = self::A|;
+  tearoff • = self::A|_#new#tearOff;
+}
+extension type Ba(self::A /* = core::int */ it) {
+  constructor • = self::Ba|;
+  tearoff • = self::Ba|_#new#tearOff;
+}
+extension type Bb(self::A? /* = core::int? */ it) {
+  constructor • = self::Bb|;
+  tearoff • = self::Bb|_#new#tearOff;
+}
+extension type C<T extends core::Object? = dynamic>(T% it) {
+  constructor • = self::C|;
+  tearoff • = self::C|_#new#tearOff;
+}
+extension type Da<T extends core::Object? = dynamic>(self::C<T%> /* = T% */ it) {
+  constructor • = self::Da|;
+  tearoff • = self::Da|_#new#tearOff;
+}
+extension type Db<T extends core::Object? = dynamic>(self::C<T?> /* = T? */ it) {
+  constructor • = self::Db|;
+  tearoff • = self::Db|_#new#tearOff;
+}
+extension type Dc<T extends core::Object? = dynamic>(self::C<T%>? /* = T? */ it) {
+  constructor • = self::Dc|;
+  tearoff • = self::Dc|_#new#tearOff;
+}
+extension type E(core::int? it) {
+  constructor • = self::E|;
+  tearoff • = self::E|_#new#tearOff;
+}
+extension type Fa(self::E /* = core::int? */ it) {
+  constructor • = self::Fa|;
+  tearoff • = self::Fa|_#new#tearOff;
+}
+extension type Fb(self::E? /* = core::int? */ it) {
+  constructor • = self::Fb|;
+  tearoff • = self::Fb|_#new#tearOff;
+}
+extension type G<T extends core::Object? = dynamic>(T? it) {
+  constructor • = self::G|;
+  tearoff • = self::G|_#new#tearOff;
+}
+extension type Ha<T extends core::Object? = dynamic>(self::G<T%> /* = T? */ it) {
+  constructor • = self::Ha|;
+  tearoff • = self::Ha|_#new#tearOff;
+}
+extension type Hb<T extends core::Object? = dynamic>(self::G<T?> /* = T? */ it) {
+  constructor • = self::Hb|;
+  tearoff • = self::Hb|_#new#tearOff;
+}
+extension type Hc<T extends core::Object? = dynamic>(self::G<T%>? /* = T? */ it) {
+  constructor • = self::Hc|;
+  tearoff • = self::Hc|_#new#tearOff;
+}
+extension type I<T extends core::Object>(T it) {
+  constructor • = self::I|;
+  tearoff • = self::I|_#new#tearOff;
+}
+extension type Ja<T extends core::Object>(self::I<T> /* = T */ it) {
+  constructor • = self::Ja|;
+  tearoff • = self::Ja|_#new#tearOff;
+}
+extension type Jc<T extends core::Object>(self::I<T>? /* = T? */ it) {
+  constructor • = self::Jc|;
+  tearoff • = self::Jc|_#new#tearOff;
+}
+extension type K<T extends core::Object>(T? it) {
+  constructor • = self::K|;
+  tearoff • = self::K|_#new#tearOff;
+}
+extension type La<T extends core::Object>(self::K<T> /* = T? */ it) {
+  constructor • = self::La|;
+  tearoff • = self::La|_#new#tearOff;
+}
+extension type Lc<T extends core::Object>(self::K<T>? /* = T? */ it) {
+  constructor • = self::Lc|;
+  tearoff • = self::Lc|_#new#tearOff;
+}
+static inline-class-member method A|(dynamic it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
+  return #this;
+}
+static inline-class-member method A|_#new#tearOff(dynamic it) → self::A /* = core::int */
+  return self::A|(it);
+static inline-class-member method Ba|(dynamic it) → self::Ba /* = core::int */ {
+  lowered final self::Ba /* = core::int */ #this = it;
+  return #this;
+}
+static inline-class-member method Ba|_#new#tearOff(dynamic it) → self::Ba /* = core::int */
+  return self::Ba|(it);
+static inline-class-member method Bb|(dynamic it) → self::Bb /* = core::int? */ {
+  lowered final self::Bb /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method Bb|_#new#tearOff(dynamic it) → self::Bb /* = core::int? */
+  return self::Bb|(it);
+static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> /* = self::C|::T% */ {
+  lowered final self::C<self::C|::T%> /* = self::C|::T% */ #this = it;
+  return #this;
+}
+static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%> /* = self::C|_#new#tearOff::T% */
+  return self::C|<self::C|_#new#tearOff::T%>(it);
+static inline-class-member method Da|<T extends core::Object? = dynamic>(dynamic it) → self::Da<self::Da|::T%> /* = self::Da|::T% */ {
+  lowered final self::Da<self::Da|::T%> /* = self::Da|::T% */ #this = it;
+  return #this;
+}
+static inline-class-member method Da|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Da<self::Da|_#new#tearOff::T%> /* = self::Da|_#new#tearOff::T% */
+  return self::Da|<self::Da|_#new#tearOff::T%>(it);
+static inline-class-member method Db|<T extends core::Object? = dynamic>(dynamic it) → self::Db<self::Db|::T%> /* = self::Db|::T? */ {
+  lowered final self::Db<self::Db|::T%> /* = self::Db|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Db|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Db<self::Db|_#new#tearOff::T%> /* = self::Db|_#new#tearOff::T? */
+  return self::Db|<self::Db|_#new#tearOff::T%>(it);
+static inline-class-member method Dc|<T extends core::Object? = dynamic>(dynamic it) → self::Dc<self::Dc|::T%> /* = self::Dc|::T? */ {
+  lowered final self::Dc<self::Dc|::T%> /* = self::Dc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Dc|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Dc<self::Dc|_#new#tearOff::T%> /* = self::Dc|_#new#tearOff::T? */
+  return self::Dc|<self::Dc|_#new#tearOff::T%>(it);
+static inline-class-member method E|(dynamic it) → self::E /* = core::int? */ {
+  lowered final self::E /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = core::int? */
+  return self::E|(it);
+static inline-class-member method Fa|(dynamic it) → self::Fa /* = core::int? */ {
+  lowered final self::Fa /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method Fa|_#new#tearOff(dynamic it) → self::Fa /* = core::int? */
+  return self::Fa|(it);
+static inline-class-member method Fb|_#new#tearOff(dynamic it) → self::Fb /* = core::int? */
+  return self::Fb|(it);
+static inline-class-member method Fb|(dynamic it) → self::Fb /* = core::int? */ {
+  lowered final self::Fb /* = core::int? */ #this = it;
+  return #this;
+}
+static inline-class-member method G|<T extends core::Object? = dynamic>(dynamic it) → self::G<self::G|::T%> /* = self::G|::T? */ {
+  lowered final self::G<self::G|::T%> /* = self::G|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method G|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::G<self::G|_#new#tearOff::T%> /* = self::G|_#new#tearOff::T? */
+  return self::G|<self::G|_#new#tearOff::T%>(it);
+static inline-class-member method Ha|<T extends core::Object? = dynamic>(dynamic it) → self::Ha<self::Ha|::T%> /* = self::Ha|::T? */ {
+  lowered final self::Ha<self::Ha|::T%> /* = self::Ha|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Ha|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Ha<self::Ha|_#new#tearOff::T%> /* = self::Ha|_#new#tearOff::T? */
+  return self::Ha|<self::Ha|_#new#tearOff::T%>(it);
+static inline-class-member method Hb|<T extends core::Object? = dynamic>(dynamic it) → self::Hb<self::Hb|::T%> /* = self::Hb|::T? */ {
+  lowered final self::Hb<self::Hb|::T%> /* = self::Hb|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Hb|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Hb<self::Hb|_#new#tearOff::T%> /* = self::Hb|_#new#tearOff::T? */
+  return self::Hb|<self::Hb|_#new#tearOff::T%>(it);
+static inline-class-member method Hc|<T extends core::Object? = dynamic>(dynamic it) → self::Hc<self::Hc|::T%> /* = self::Hc|::T? */ {
+  lowered final self::Hc<self::Hc|::T%> /* = self::Hc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Hc|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::Hc<self::Hc|_#new#tearOff::T%> /* = self::Hc|_#new#tearOff::T? */
+  return self::Hc|<self::Hc|_#new#tearOff::T%>(it);
+static inline-class-member method I|<T extends core::Object = dynamic>(dynamic it) → self::I<self::I|::T> /* = self::I|::T */ {
+  lowered final self::I<self::I|::T> /* = self::I|::T */ #this = it;
+  return #this;
+}
+static inline-class-member method I|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::I<self::I|_#new#tearOff::T> /* = self::I|_#new#tearOff::T */
+  return self::I|<self::I|_#new#tearOff::T>(it);
+static inline-class-member method Ja|<T extends core::Object = dynamic>(dynamic it) → self::Ja<self::Ja|::T> /* = self::Ja|::T */ {
+  lowered final self::Ja<self::Ja|::T> /* = self::Ja|::T */ #this = it;
+  return #this;
+}
+static inline-class-member method Ja|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::Ja<self::Ja|_#new#tearOff::T> /* = self::Ja|_#new#tearOff::T */
+  return self::Ja|<self::Ja|_#new#tearOff::T>(it);
+static inline-class-member method Jc|<T extends core::Object = dynamic>(dynamic it) → self::Jc<self::Jc|::T> /* = self::Jc|::T? */ {
+  lowered final self::Jc<self::Jc|::T> /* = self::Jc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Jc|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::Jc<self::Jc|_#new#tearOff::T> /* = self::Jc|_#new#tearOff::T? */
+  return self::Jc|<self::Jc|_#new#tearOff::T>(it);
+static inline-class-member method K|<T extends core::Object = dynamic>(dynamic it) → self::K<self::K|::T> /* = self::K|::T? */ {
+  lowered final self::K<self::K|::T> /* = self::K|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method K|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::K<self::K|_#new#tearOff::T> /* = self::K|_#new#tearOff::T? */
+  return self::K|<self::K|_#new#tearOff::T>(it);
+static inline-class-member method La|<T extends core::Object = dynamic>(dynamic it) → self::La<self::La|::T> /* = self::La|::T? */ {
+  lowered final self::La<self::La|::T> /* = self::La|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method La|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::La<self::La|_#new#tearOff::T> /* = self::La|_#new#tearOff::T? */
+  return self::La|<self::La|_#new#tearOff::T>(it);
+static inline-class-member method Lc|<T extends core::Object = dynamic>(dynamic it) → self::Lc<self::Lc|::T> /* = self::Lc|::T? */ {
+  lowered final self::Lc<self::Lc|::T> /* = self::Lc|::T? */ #this = it;
+  return #this;
+}
+static inline-class-member method Lc|_#new#tearOff<T extends core::Object = dynamic>(dynamic it) → self::Lc<self::Lc|_#new#tearOff::T> /* = self::Lc|_#new#tearOff::T? */
+  return self::Lc|<self::Lc|_#new#tearOff::T>(it);
+static method testA(Never n) → dynamic {
+  self::A /* = core::int */ a1 = let final Never #t1 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::A? /* = core::int? */ a2 = let final Never #t2 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testBa(Never n) → dynamic {
+  self::Ba /* = core::int */ ba1 = let final Never #t3 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ba? /* = core::int? */ ba2 = let final Never #t4 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Bb /* = core::int? */ bb3 = let final Never #t5 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Bb? /* = core::int? */ bb4 = let final Never #t6 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testC<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::C<dynamic> /* = dynamic */ c1 = let final Never #t7 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<dynamic>? /* = dynamic */ c2 = let final Never #t8 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<core::int> /* = core::int */ c3 = let final Never #t9 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<core::int?> /* = core::int? */ c4 = let final Never #t10 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<core::int>? /* = core::int? */ c5 = let final Never #t11 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<core::int?>? /* = core::int? */ c6 = let final Never #t12 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::S%> /* = self::testC::S% */ c7 = let final Never #t13 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::S%>? /* = self::testC::S? */ c8 = let final Never #t14 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::S?> /* = self::testC::S? */ c9 = let final Never #t15 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::S?>? /* = self::testC::S? */ c10 = let final Never #t16 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::U> /* = self::testC::U */ c11 = let final Never #t17 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::U>? /* = self::testC::U? */ c12 = let final Never #t18 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::U?> /* = self::testC::U? */ c13 = let final Never #t19 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::C<self::testC::U?>? /* = self::testC::U? */ c14 = let final Never #t20 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testDa<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Da<dynamic> /* = dynamic */ da1 = let final Never #t21 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<dynamic>? /* = dynamic */ da2 = let final Never #t22 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<core::int> /* = core::int */ da3 = let final Never #t23 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<core::int?> /* = core::int? */ da4 = let final Never #t24 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<core::int>? /* = core::int? */ da5 = let final Never #t25 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<core::int?>? /* = core::int? */ da6 = let final Never #t26 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::S%> /* = self::testDa::S% */ da7 = let final Never #t27 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::S%>? /* = self::testDa::S? */ da8 = let final Never #t28 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::S?> /* = self::testDa::S? */ da9 = let final Never #t29 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::S?>? /* = self::testDa::S? */ da10 = let final Never #t30 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::U> /* = self::testDa::U */ da11 = let final Never #t31 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::U>? /* = self::testDa::U? */ da12 = let final Never #t32 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::U?> /* = self::testDa::U? */ da13 = let final Never #t33 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Da<self::testDa::U?>? /* = self::testDa::U? */ da14 = let final Never #t34 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testDb<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Db<dynamic> /* = dynamic */ db1 = let final Never #t35 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<dynamic>? /* = dynamic */ db2 = let final Never #t36 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<core::int> /* = core::int? */ db3 = let final Never #t37 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<core::int?> /* = core::int? */ db4 = let final Never #t38 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<core::int>? /* = core::int? */ db5 = let final Never #t39 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<core::int?>? /* = core::int? */ db6 = let final Never #t40 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::S%> /* = self::testDb::S? */ db7 = let final Never #t41 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::S%>? /* = self::testDb::S? */ db8 = let final Never #t42 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::S?> /* = self::testDb::S? */ db9 = let final Never #t43 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::S?>? /* = self::testDb::S? */ db10 = let final Never #t44 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::U> /* = self::testDb::U? */ db11 = let final Never #t45 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::U>? /* = self::testDb::U? */ db12 = let final Never #t46 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::U?> /* = self::testDb::U? */ db13 = let final Never #t47 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Db<self::testDb::U?>? /* = self::testDb::U? */ db14 = let final Never #t48 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testDc<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Dc<dynamic> /* = dynamic */ dc1 = let final Never #t49 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<dynamic>? /* = dynamic */ dc2 = let final Never #t50 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<core::int> /* = core::int? */ dc3 = let final Never #t51 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<core::int?> /* = core::int? */ dc4 = let final Never #t52 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<core::int>? /* = core::int? */ dc5 = let final Never #t53 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<core::int?>? /* = core::int? */ dc6 = let final Never #t54 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::S%> /* = self::testDc::S? */ dc7 = let final Never #t55 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::S%>? /* = self::testDc::S? */ dc8 = let final Never #t56 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::S?> /* = self::testDc::S? */ dc9 = let final Never #t57 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::S?>? /* = self::testDc::S? */ dc10 = let final Never #t58 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::U> /* = self::testDc::U? */ dc11 = let final Never #t59 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::U>? /* = self::testDc::U? */ dc12 = let final Never #t60 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::U?> /* = self::testDc::U? */ dc13 = let final Never #t61 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Dc<self::testDc::U?>? /* = self::testDc::U? */ dc14 = let final Never #t62 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testE(Never n) → dynamic {
+  self::E /* = core::int? */ e1 = let final Never #t63 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::E? /* = core::int? */ e2 = let final Never #t64 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testF(Never n) → dynamic {
+  self::Fa /* = core::int? */ fa1 = let final Never #t65 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Fa? /* = core::int? */ fa2 = let final Never #t66 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Fb /* = core::int? */ fb3 = let final Never #t67 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Fb? /* = core::int? */ fb4 = let final Never #t68 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testG<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::G<dynamic> /* = dynamic */ g1 = let final Never #t69 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<dynamic>? /* = dynamic */ g2 = let final Never #t70 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<core::int> /* = core::int? */ g3 = let final Never #t71 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<core::int?> /* = core::int? */ g4 = let final Never #t72 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<core::int>? /* = core::int? */ g5 = let final Never #t73 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<core::int?>? /* = core::int? */ g6 = let final Never #t74 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::S%> /* = self::testG::S? */ g7 = let final Never #t75 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::S%>? /* = self::testG::S? */ g8 = let final Never #t76 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::S?> /* = self::testG::S? */ g9 = let final Never #t77 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::S?>? /* = self::testG::S? */ g10 = let final Never #t78 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::U> /* = self::testG::U? */ g11 = let final Never #t79 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::U>? /* = self::testG::U? */ g12 = let final Never #t80 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::U?> /* = self::testG::U? */ g13 = let final Never #t81 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::G<self::testG::U?>? /* = self::testG::U? */ g14 = let final Never #t82 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testHa<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Ha<dynamic> /* = dynamic */ ha1 = let final Never #t83 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<dynamic>? /* = dynamic */ ha2 = let final Never #t84 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<core::int> /* = core::int? */ ha3 = let final Never #t85 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<core::int?> /* = core::int? */ ha4 = let final Never #t86 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<core::int>? /* = core::int? */ ha5 = let final Never #t87 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<core::int?>? /* = core::int? */ ha6 = let final Never #t88 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::S%> /* = self::testHa::S? */ ha7 = let final Never #t89 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::S%>? /* = self::testHa::S? */ ha8 = let final Never #t90 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::S?> /* = self::testHa::S? */ ha9 = let final Never #t91 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::S?>? /* = self::testHa::S? */ ha10 = let final Never #t92 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::U> /* = self::testHa::U? */ ha11 = let final Never #t93 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::U>? /* = self::testHa::U? */ ha12 = let final Never #t94 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::U?> /* = self::testHa::U? */ ha13 = let final Never #t95 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ha<self::testHa::U?>? /* = self::testHa::U? */ ha14 = let final Never #t96 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testHb<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Hb<dynamic> /* = dynamic */ hb1 = let final Never #t97 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<dynamic>? /* = dynamic */ hb2 = let final Never #t98 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<core::int> /* = core::int? */ hb3 = let final Never #t99 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<core::int?> /* = core::int? */ hb4 = let final Never #t100 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<core::int>? /* = core::int? */ hb5 = let final Never #t101 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<core::int?>? /* = core::int? */ hb6 = let final Never #t102 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::S%> /* = self::testHb::S? */ hb7 = let final Never #t103 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::S%>? /* = self::testHb::S? */ hb8 = let final Never #t104 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::S?> /* = self::testHb::S? */ hb9 = let final Never #t105 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::S?>? /* = self::testHb::S? */ hb10 = let final Never #t106 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::U> /* = self::testHb::U? */ hb11 = let final Never #t107 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::U>? /* = self::testHb::U? */ hb12 = let final Never #t108 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::U?> /* = self::testHb::U? */ hb13 = let final Never #t109 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hb<self::testHb::U?>? /* = self::testHb::U? */ hb14 = let final Never #t110 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testHc<S extends core::Object? = dynamic, U extends core::Object>(Never n) → dynamic {
+  self::Hc<dynamic> /* = dynamic */ hc1 = let final Never #t111 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<dynamic>? /* = dynamic */ hc2 = let final Never #t112 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<core::int> /* = core::int? */ hc3 = let final Never #t113 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<core::int?> /* = core::int? */ hc4 = let final Never #t114 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<core::int>? /* = core::int? */ hc5 = let final Never #t115 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<core::int?>? /* = core::int? */ hc6 = let final Never #t116 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::S%> /* = self::testHc::S? */ hc7 = let final Never #t117 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::S%>? /* = self::testHc::S? */ hc8 = let final Never #t118 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::S?> /* = self::testHc::S? */ hc9 = let final Never #t119 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::S?>? /* = self::testHc::S? */ hc10 = let final Never #t120 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::U> /* = self::testHc::U? */ hc11 = let final Never #t121 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::U>? /* = self::testHc::U? */ hc12 = let final Never #t122 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::U?> /* = self::testHc::U? */ hc13 = let final Never #t123 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Hc<self::testHc::U?>? /* = self::testHc::U? */ hc14 = let final Never #t124 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testI<U extends core::Object>(Never n) → dynamic {
+  self::I<core::Object> /* = core::Object */ i1 = let final Never #t125 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::I<core::Object>? /* = core::Object? */ i2 = let final Never #t126 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::I<core::int> /* = core::int */ i3 = let final Never #t127 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::I<core::int>? /* = core::int? */ i5 = let final Never #t128 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::I<self::testI::U> /* = self::testI::U */ i11 = let final Never #t129 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::I<self::testI::U>? /* = self::testI::U? */ i12 = let final Never #t130 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testJa<U extends core::Object>(Never n) → dynamic {
+  self::Ja<core::Object> /* = core::Object */ ja1 = let final Never #t131 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ja<core::Object>? /* = core::Object? */ ja2 = let final Never #t132 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ja<core::int> /* = core::int */ ja3 = let final Never #t133 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ja<core::int>? /* = core::int? */ ja5 = let final Never #t134 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ja<self::testJa::U> /* = self::testJa::U */ ja11 = let final Never #t135 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Ja<self::testJa::U>? /* = self::testJa::U? */ ja12 = let final Never #t136 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testJc<U extends core::Object>(Never n) → dynamic {
+  self::Jc<core::Object> /* = core::Object? */ jc1 = let final Never #t137 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Jc<core::Object>? /* = core::Object? */ jc2 = let final Never #t138 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Jc<core::int> /* = core::int? */ jc3 = let final Never #t139 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Jc<core::int>? /* = core::int? */ jc5 = let final Never #t140 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Jc<self::testJc::U> /* = self::testJc::U? */ jc11 = let final Never #t141 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Jc<self::testJc::U>? /* = self::testJc::U? */ jc12 = let final Never #t142 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testK<U extends core::Object>(Never n) → dynamic {
+  self::K<core::Object> /* = core::Object? */ k1 = let final Never #t143 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::K<core::Object>? /* = core::Object? */ k2 = let final Never #t144 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::K<core::int> /* = core::int? */ k3 = let final Never #t145 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::K<core::int>? /* = core::int? */ k5 = let final Never #t146 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::K<self::testK::U> /* = self::testK::U? */ k11 = let final Never #t147 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::K<self::testK::U>? /* = self::testK::U? */ k12 = let final Never #t148 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testLa<U extends core::Object>(Never n) → dynamic {
+  self::La<core::Object> /* = core::Object? */ la1 = let final Never #t149 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::La<core::Object>? /* = core::Object? */ la2 = let final Never #t150 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::La<core::int> /* = core::int? */ la3 = let final Never #t151 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::La<core::int>? /* = core::int? */ la5 = let final Never #t152 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::La<self::testLa::U> /* = self::testLa::U? */ la11 = let final Never #t153 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::La<self::testLa::U>? /* = self::testLa::U? */ la12 = let final Never #t154 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
+static method testLc<U extends core::Object>(Never n) → dynamic {
+  self::Lc<core::Object> /* = core::Object? */ lc1 = let final Never #t155 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Lc<core::Object>? /* = core::Object? */ lc2 = let final Never #t156 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Lc<core::int> /* = core::int? */ lc3 = let final Never #t157 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Lc<core::int>? /* = core::int? */ lc5 = let final Never #t158 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Lc<self::testLc::U> /* = self::testLc::U? */ lc11 = let final Never #t159 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+  self::Lc<self::testLc::U>? /* = self::testLc::U? */ lc12 = let final Never #t160 = n in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
+}
diff --git a/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.strong.expect
index 78d28b3a970..12b93d75ed9 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.strong.expect
@@ -17,49 +17,49 @@ extension type A<T extends core::Object? = dynamic>(core::int it) {
   constructor • = self::A|;
   tearoff • = self::A|_#new#tearOff;
 }
-extension type B<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> {
+extension type B<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> /* = core::int */ {
   constructor • = self::B|;
   tearoff • = self::B|_#new#tearOff;
 }
-extension type C<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> {
+extension type C<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> /* = core::int */ {
   constructor • = self::C|;
   tearoff • = self::C|_#new#tearOff;
 }
-extension type D(core::int it) implements self::A<core::int>, self::B<core::String> {
+extension type D(core::int it) implements self::A<core::int> /* = core::int */, self::B<core::String> /* = core::int */ {
   constructor • = self::D|;
   tearoff • = self::D|_#new#tearOff;
 }
-extension type E(core::int it) implements self::B<core::int>, self::C<core::String> {
+extension type E(core::int it) implements self::B<core::int> /* = core::int */, self::C<core::String> /* = core::int */ {
   constructor • = self::E|;
   tearoff • = self::E|_#new#tearOff;
 }
-static inline-class-member method A|<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|::T%> {
-  lowered final self::A<self::A|::T%> #this = it;
+static inline-class-member method A|<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|::T%> /* = core::int */ {
+  lowered final self::A<self::A|::T%> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|_#new#tearOff::T%>
+static inline-class-member method A|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|_#new#tearOff::T%> /* = core::int */
   return self::A|<self::A|_#new#tearOff::T%>(it);
-static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> /* = core::int */ {
+  lowered final self::B<self::B|::T%> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%> /* = core::int */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> {
-  lowered final self::C<self::C|::T%> #this = it;
+static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> /* = core::int */ {
+  lowered final self::C<self::C|::T%> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%>
+static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%> /* = core::int */
   return self::C|<self::C|_#new#tearOff::T%>(it);
-static inline-class-member method D|(dynamic it) → self::D {
-  lowered final self::D #this = it;
+static inline-class-member method D|(dynamic it) → self::D /* = core::int */ {
+  lowered final self::D /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D|_#new#tearOff(dynamic it) → self::D
+static inline-class-member method D|_#new#tearOff(dynamic it) → self::D /* = core::int */
   return self::D|(it);
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = core::int */ {
+  lowered final self::E /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = core::int */
   return self::E|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.strong.transformed.expect
index 78d28b3a970..12b93d75ed9 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.strong.transformed.expect
@@ -17,49 +17,49 @@ extension type A<T extends core::Object? = dynamic>(core::int it) {
   constructor • = self::A|;
   tearoff • = self::A|_#new#tearOff;
 }
-extension type B<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> {
+extension type B<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> /* = core::int */ {
   constructor • = self::B|;
   tearoff • = self::B|_#new#tearOff;
 }
-extension type C<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> {
+extension type C<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> /* = core::int */ {
   constructor • = self::C|;
   tearoff • = self::C|_#new#tearOff;
 }
-extension type D(core::int it) implements self::A<core::int>, self::B<core::String> {
+extension type D(core::int it) implements self::A<core::int> /* = core::int */, self::B<core::String> /* = core::int */ {
   constructor • = self::D|;
   tearoff • = self::D|_#new#tearOff;
 }
-extension type E(core::int it) implements self::B<core::int>, self::C<core::String> {
+extension type E(core::int it) implements self::B<core::int> /* = core::int */, self::C<core::String> /* = core::int */ {
   constructor • = self::E|;
   tearoff • = self::E|_#new#tearOff;
 }
-static inline-class-member method A|<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|::T%> {
-  lowered final self::A<self::A|::T%> #this = it;
+static inline-class-member method A|<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|::T%> /* = core::int */ {
+  lowered final self::A<self::A|::T%> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|_#new#tearOff::T%>
+static inline-class-member method A|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|_#new#tearOff::T%> /* = core::int */
   return self::A|<self::A|_#new#tearOff::T%>(it);
-static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> /* = core::int */ {
+  lowered final self::B<self::B|::T%> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%> /* = core::int */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> {
-  lowered final self::C<self::C|::T%> #this = it;
+static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> /* = core::int */ {
+  lowered final self::C<self::C|::T%> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%>
+static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%> /* = core::int */
   return self::C|<self::C|_#new#tearOff::T%>(it);
-static inline-class-member method D|(dynamic it) → self::D {
-  lowered final self::D #this = it;
+static inline-class-member method D|(dynamic it) → self::D /* = core::int */ {
+  lowered final self::D /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D|_#new#tearOff(dynamic it) → self::D
+static inline-class-member method D|_#new#tearOff(dynamic it) → self::D /* = core::int */
   return self::D|(it);
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = core::int */ {
+  lowered final self::E /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = core::int */
   return self::E|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.weak.expect
index 78d28b3a970..12b93d75ed9 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.weak.expect
@@ -17,49 +17,49 @@ extension type A<T extends core::Object? = dynamic>(core::int it) {
   constructor • = self::A|;
   tearoff • = self::A|_#new#tearOff;
 }
-extension type B<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> {
+extension type B<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> /* = core::int */ {
   constructor • = self::B|;
   tearoff • = self::B|_#new#tearOff;
 }
-extension type C<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> {
+extension type C<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> /* = core::int */ {
   constructor • = self::C|;
   tearoff • = self::C|_#new#tearOff;
 }
-extension type D(core::int it) implements self::A<core::int>, self::B<core::String> {
+extension type D(core::int it) implements self::A<core::int> /* = core::int */, self::B<core::String> /* = core::int */ {
   constructor • = self::D|;
   tearoff • = self::D|_#new#tearOff;
 }
-extension type E(core::int it) implements self::B<core::int>, self::C<core::String> {
+extension type E(core::int it) implements self::B<core::int> /* = core::int */, self::C<core::String> /* = core::int */ {
   constructor • = self::E|;
   tearoff • = self::E|_#new#tearOff;
 }
-static inline-class-member method A|<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|::T%> {
-  lowered final self::A<self::A|::T%> #this = it;
+static inline-class-member method A|<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|::T%> /* = core::int */ {
+  lowered final self::A<self::A|::T%> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|_#new#tearOff::T%>
+static inline-class-member method A|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|_#new#tearOff::T%> /* = core::int */
   return self::A|<self::A|_#new#tearOff::T%>(it);
-static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> /* = core::int */ {
+  lowered final self::B<self::B|::T%> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%> /* = core::int */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> {
-  lowered final self::C<self::C|::T%> #this = it;
+static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> /* = core::int */ {
+  lowered final self::C<self::C|::T%> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%>
+static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%> /* = core::int */
   return self::C|<self::C|_#new#tearOff::T%>(it);
-static inline-class-member method D|(dynamic it) → self::D {
-  lowered final self::D #this = it;
+static inline-class-member method D|(dynamic it) → self::D /* = core::int */ {
+  lowered final self::D /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D|_#new#tearOff(dynamic it) → self::D
+static inline-class-member method D|_#new#tearOff(dynamic it) → self::D /* = core::int */
   return self::D|(it);
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = core::int */ {
+  lowered final self::E /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = core::int */
   return self::E|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.weak.modular.expect
index 78d28b3a970..12b93d75ed9 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.weak.modular.expect
@@ -17,49 +17,49 @@ extension type A<T extends core::Object? = dynamic>(core::int it) {
   constructor • = self::A|;
   tearoff • = self::A|_#new#tearOff;
 }
-extension type B<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> {
+extension type B<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> /* = core::int */ {
   constructor • = self::B|;
   tearoff • = self::B|_#new#tearOff;
 }
-extension type C<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> {
+extension type C<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> /* = core::int */ {
   constructor • = self::C|;
   tearoff • = self::C|_#new#tearOff;
 }
-extension type D(core::int it) implements self::A<core::int>, self::B<core::String> {
+extension type D(core::int it) implements self::A<core::int> /* = core::int */, self::B<core::String> /* = core::int */ {
   constructor • = self::D|;
   tearoff • = self::D|_#new#tearOff;
 }
-extension type E(core::int it) implements self::B<core::int>, self::C<core::String> {
+extension type E(core::int it) implements self::B<core::int> /* = core::int */, self::C<core::String> /* = core::int */ {
   constructor • = self::E|;
   tearoff • = self::E|_#new#tearOff;
 }
-static inline-class-member method A|<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|::T%> {
-  lowered final self::A<self::A|::T%> #this = it;
+static inline-class-member method A|<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|::T%> /* = core::int */ {
+  lowered final self::A<self::A|::T%> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|_#new#tearOff::T%>
+static inline-class-member method A|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|_#new#tearOff::T%> /* = core::int */
   return self::A|<self::A|_#new#tearOff::T%>(it);
-static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> /* = core::int */ {
+  lowered final self::B<self::B|::T%> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%> /* = core::int */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> {
-  lowered final self::C<self::C|::T%> #this = it;
+static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> /* = core::int */ {
+  lowered final self::C<self::C|::T%> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%>
+static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%> /* = core::int */
   return self::C|<self::C|_#new#tearOff::T%>(it);
-static inline-class-member method D|(dynamic it) → self::D {
-  lowered final self::D #this = it;
+static inline-class-member method D|(dynamic it) → self::D /* = core::int */ {
+  lowered final self::D /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D|_#new#tearOff(dynamic it) → self::D
+static inline-class-member method D|_#new#tearOff(dynamic it) → self::D /* = core::int */
   return self::D|(it);
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = core::int */ {
+  lowered final self::E /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = core::int */
   return self::E|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.weak.outline.expect
index 177f1be8d75..2f4656b1795 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.weak.outline.expect
@@ -17,39 +17,39 @@ extension type A<T extends core::Object? = dynamic>(core::int it) {
   constructor • = self::A|;
   tearoff • = self::A|_#new#tearOff;
 }
-extension type B<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> {
+extension type B<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> /* = core::int */ {
   constructor • = self::B|;
   tearoff • = self::B|_#new#tearOff;
 }
-extension type C<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> {
+extension type C<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> /* = core::int */ {
   constructor • = self::C|;
   tearoff • = self::C|_#new#tearOff;
 }
-extension type D(core::int it) implements self::A<core::int>, self::B<core::String> {
+extension type D(core::int it) implements self::A<core::int> /* = core::int */, self::B<core::String> /* = core::int */ {
   constructor • = self::D|;
   tearoff • = self::D|_#new#tearOff;
 }
-extension type E(core::int it) implements self::B<core::int>, self::C<core::String> {
+extension type E(core::int it) implements self::B<core::int> /* = core::int */, self::C<core::String> /* = core::int */ {
   constructor • = self::E|;
   tearoff • = self::E|_#new#tearOff;
 }
-static inline-class-member method A|<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|::T%>
+static inline-class-member method A|<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|::T%> /* = core::int */
   ;
-static inline-class-member method A|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|_#new#tearOff::T%>
+static inline-class-member method A|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|_#new#tearOff::T%> /* = core::int */
   return self::A|<self::A|_#new#tearOff::T%>(it);
-static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%>
+static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> /* = core::int */
   ;
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%> /* = core::int */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%>
+static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> /* = core::int */
   ;
-static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%>
+static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%> /* = core::int */
   return self::C|<self::C|_#new#tearOff::T%>(it);
-static inline-class-member method D|(dynamic it) → self::D
+static inline-class-member method D|(dynamic it) → self::D /* = core::int */
   ;
-static inline-class-member method D|_#new#tearOff(dynamic it) → self::D
+static inline-class-member method D|_#new#tearOff(dynamic it) → self::D /* = core::int */
   return self::D|(it);
-static inline-class-member method E|(dynamic it) → self::E
+static inline-class-member method E|(dynamic it) → self::E /* = core::int */
   ;
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = core::int */
   return self::E|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.weak.transformed.expect
index 78d28b3a970..12b93d75ed9 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/super_extension_type_conflict.dart.weak.transformed.expect
@@ -17,49 +17,49 @@ extension type A<T extends core::Object? = dynamic>(core::int it) {
   constructor • = self::A|;
   tearoff • = self::A|_#new#tearOff;
 }
-extension type B<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> {
+extension type B<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> /* = core::int */ {
   constructor • = self::B|;
   tearoff • = self::B|_#new#tearOff;
 }
-extension type C<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> {
+extension type C<T extends core::Object? = dynamic>(core::int it) implements self::A<T%> /* = core::int */ {
   constructor • = self::C|;
   tearoff • = self::C|_#new#tearOff;
 }
-extension type D(core::int it) implements self::A<core::int>, self::B<core::String> {
+extension type D(core::int it) implements self::A<core::int> /* = core::int */, self::B<core::String> /* = core::int */ {
   constructor • = self::D|;
   tearoff • = self::D|_#new#tearOff;
 }
-extension type E(core::int it) implements self::B<core::int>, self::C<core::String> {
+extension type E(core::int it) implements self::B<core::int> /* = core::int */, self::C<core::String> /* = core::int */ {
   constructor • = self::E|;
   tearoff • = self::E|_#new#tearOff;
 }
-static inline-class-member method A|<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|::T%> {
-  lowered final self::A<self::A|::T%> #this = it;
+static inline-class-member method A|<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|::T%> /* = core::int */ {
+  lowered final self::A<self::A|::T%> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|_#new#tearOff::T%>
+static inline-class-member method A|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::A<self::A|_#new#tearOff::T%> /* = core::int */
   return self::A|<self::A|_#new#tearOff::T%>(it);
-static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> /* = core::int */ {
+  lowered final self::B<self::B|::T%> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%> /* = core::int */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> {
-  lowered final self::C<self::C|::T%> #this = it;
+static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> /* = core::int */ {
+  lowered final self::C<self::C|::T%> /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%>
+static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%> /* = core::int */
   return self::C|<self::C|_#new#tearOff::T%>(it);
-static inline-class-member method D|(dynamic it) → self::D {
-  lowered final self::D #this = it;
+static inline-class-member method D|(dynamic it) → self::D /* = core::int */ {
+  lowered final self::D /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D|_#new#tearOff(dynamic it) → self::D
+static inline-class-member method D|_#new#tearOff(dynamic it) → self::D /* = core::int */
   return self::D|(it);
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = core::int */ {
+  lowered final self::E /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = core::int */
   return self::E|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.strong.expect
index 302a8814089..aab7d029062 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.strong.expect
@@ -26,7 +26,7 @@ extension type C<T extends core::Object? = dynamic>(self::A<T%> it) {
   constructor • = self::C|;
   tearoff • = self::C|_#new#tearOff;
 }
-extension type D(self::A<Never> it) implements self::A<core::int>, self::B<core::String> {
+extension type D(self::A<Never> it) implements self::A<core::int>, self::B<core::String> /* = self::A<core::String> */ {
   constructor • = self::D|;
   tearoff • = self::D|_#new#tearOff;
 }
@@ -34,27 +34,27 @@ extension type E(self::A<Never> it) {
   constructor • = self::E|;
   tearoff • = self::E|_#new#tearOff;
 }
-static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> /* = self::A<self::B|::T%> */ {
+  lowered final self::B<self::B|::T%> /* = self::A<self::B|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%> /* = self::A<self::B|_#new#tearOff::T%> */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> {
-  lowered final self::C<self::C|::T%> #this = it;
+static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> /* = self::A<self::C|::T%> */ {
+  lowered final self::C<self::C|::T%> /* = self::A<self::C|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%>
+static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%> /* = self::A<self::C|_#new#tearOff::T%> */
   return self::C|<self::C|_#new#tearOff::T%>(it);
-static inline-class-member method D|(dynamic it) → self::D {
-  lowered final self::D #this = it;
+static inline-class-member method D|(dynamic it) → self::D /* = self::A<Never> */ {
+  lowered final self::D /* = self::A<Never> */ #this = it;
   return #this;
 }
-static inline-class-member method D|_#new#tearOff(dynamic it) → self::D
+static inline-class-member method D|_#new#tearOff(dynamic it) → self::D /* = self::A<Never> */
   return self::D|(it);
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = self::A<Never> */ {
+  lowered final self::E /* = self::A<Never> */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = self::A<Never> */
   return self::E|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.strong.transformed.expect
index 302a8814089..aab7d029062 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.strong.transformed.expect
@@ -26,7 +26,7 @@ extension type C<T extends core::Object? = dynamic>(self::A<T%> it) {
   constructor • = self::C|;
   tearoff • = self::C|_#new#tearOff;
 }
-extension type D(self::A<Never> it) implements self::A<core::int>, self::B<core::String> {
+extension type D(self::A<Never> it) implements self::A<core::int>, self::B<core::String> /* = self::A<core::String> */ {
   constructor • = self::D|;
   tearoff • = self::D|_#new#tearOff;
 }
@@ -34,27 +34,27 @@ extension type E(self::A<Never> it) {
   constructor • = self::E|;
   tearoff • = self::E|_#new#tearOff;
 }
-static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> /* = self::A<self::B|::T%> */ {
+  lowered final self::B<self::B|::T%> /* = self::A<self::B|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%> /* = self::A<self::B|_#new#tearOff::T%> */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> {
-  lowered final self::C<self::C|::T%> #this = it;
+static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> /* = self::A<self::C|::T%> */ {
+  lowered final self::C<self::C|::T%> /* = self::A<self::C|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%>
+static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%> /* = self::A<self::C|_#new#tearOff::T%> */
   return self::C|<self::C|_#new#tearOff::T%>(it);
-static inline-class-member method D|(dynamic it) → self::D {
-  lowered final self::D #this = it;
+static inline-class-member method D|(dynamic it) → self::D /* = self::A<Never> */ {
+  lowered final self::D /* = self::A<Never> */ #this = it;
   return #this;
 }
-static inline-class-member method D|_#new#tearOff(dynamic it) → self::D
+static inline-class-member method D|_#new#tearOff(dynamic it) → self::D /* = self::A<Never> */
   return self::D|(it);
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = self::A<Never> */ {
+  lowered final self::E /* = self::A<Never> */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = self::A<Never> */
   return self::E|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.weak.expect
index 302a8814089..aab7d029062 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.weak.expect
@@ -26,7 +26,7 @@ extension type C<T extends core::Object? = dynamic>(self::A<T%> it) {
   constructor • = self::C|;
   tearoff • = self::C|_#new#tearOff;
 }
-extension type D(self::A<Never> it) implements self::A<core::int>, self::B<core::String> {
+extension type D(self::A<Never> it) implements self::A<core::int>, self::B<core::String> /* = self::A<core::String> */ {
   constructor • = self::D|;
   tearoff • = self::D|_#new#tearOff;
 }
@@ -34,27 +34,27 @@ extension type E(self::A<Never> it) {
   constructor • = self::E|;
   tearoff • = self::E|_#new#tearOff;
 }
-static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> /* = self::A<self::B|::T%> */ {
+  lowered final self::B<self::B|::T%> /* = self::A<self::B|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%> /* = self::A<self::B|_#new#tearOff::T%> */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> {
-  lowered final self::C<self::C|::T%> #this = it;
+static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> /* = self::A<self::C|::T%> */ {
+  lowered final self::C<self::C|::T%> /* = self::A<self::C|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%>
+static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%> /* = self::A<self::C|_#new#tearOff::T%> */
   return self::C|<self::C|_#new#tearOff::T%>(it);
-static inline-class-member method D|(dynamic it) → self::D {
-  lowered final self::D #this = it;
+static inline-class-member method D|(dynamic it) → self::D /* = self::A<Never> */ {
+  lowered final self::D /* = self::A<Never> */ #this = it;
   return #this;
 }
-static inline-class-member method D|_#new#tearOff(dynamic it) → self::D
+static inline-class-member method D|_#new#tearOff(dynamic it) → self::D /* = self::A<Never> */
   return self::D|(it);
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = self::A<Never> */ {
+  lowered final self::E /* = self::A<Never> */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = self::A<Never> */
   return self::E|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.weak.modular.expect
index 302a8814089..aab7d029062 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.weak.modular.expect
@@ -26,7 +26,7 @@ extension type C<T extends core::Object? = dynamic>(self::A<T%> it) {
   constructor • = self::C|;
   tearoff • = self::C|_#new#tearOff;
 }
-extension type D(self::A<Never> it) implements self::A<core::int>, self::B<core::String> {
+extension type D(self::A<Never> it) implements self::A<core::int>, self::B<core::String> /* = self::A<core::String> */ {
   constructor • = self::D|;
   tearoff • = self::D|_#new#tearOff;
 }
@@ -34,27 +34,27 @@ extension type E(self::A<Never> it) {
   constructor • = self::E|;
   tearoff • = self::E|_#new#tearOff;
 }
-static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> /* = self::A<self::B|::T%> */ {
+  lowered final self::B<self::B|::T%> /* = self::A<self::B|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%> /* = self::A<self::B|_#new#tearOff::T%> */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> {
-  lowered final self::C<self::C|::T%> #this = it;
+static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> /* = self::A<self::C|::T%> */ {
+  lowered final self::C<self::C|::T%> /* = self::A<self::C|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%>
+static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%> /* = self::A<self::C|_#new#tearOff::T%> */
   return self::C|<self::C|_#new#tearOff::T%>(it);
-static inline-class-member method D|(dynamic it) → self::D {
-  lowered final self::D #this = it;
+static inline-class-member method D|(dynamic it) → self::D /* = self::A<Never> */ {
+  lowered final self::D /* = self::A<Never> */ #this = it;
   return #this;
 }
-static inline-class-member method D|_#new#tearOff(dynamic it) → self::D
+static inline-class-member method D|_#new#tearOff(dynamic it) → self::D /* = self::A<Never> */
   return self::D|(it);
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = self::A<Never> */ {
+  lowered final self::E /* = self::A<Never> */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = self::A<Never> */
   return self::E|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.weak.outline.expect
index 5190f94664d..01b337df6a5 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.weak.outline.expect
@@ -25,7 +25,7 @@ extension type C<T extends core::Object? = dynamic>(self::A<T%> it) {
   constructor • = self::C|;
   tearoff • = self::C|_#new#tearOff;
 }
-extension type D(self::A<Never> it) implements self::A<core::int>, self::B<core::String> {
+extension type D(self::A<Never> it) implements self::A<core::int>, self::B<core::String> /* = self::A<core::String> */ {
   constructor • = self::D|;
   tearoff • = self::D|_#new#tearOff;
 }
@@ -33,19 +33,19 @@ extension type E(self::A<Never> it) {
   constructor • = self::E|;
   tearoff • = self::E|_#new#tearOff;
 }
-static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%>
+static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> /* = self::A<self::B|::T%> */
   ;
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%> /* = self::A<self::B|_#new#tearOff::T%> */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%>
+static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> /* = self::A<self::C|::T%> */
   ;
-static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%>
+static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%> /* = self::A<self::C|_#new#tearOff::T%> */
   return self::C|<self::C|_#new#tearOff::T%>(it);
-static inline-class-member method D|(dynamic it) → self::D
+static inline-class-member method D|(dynamic it) → self::D /* = self::A<Never> */
   ;
-static inline-class-member method D|_#new#tearOff(dynamic it) → self::D
+static inline-class-member method D|_#new#tearOff(dynamic it) → self::D /* = self::A<Never> */
   return self::D|(it);
-static inline-class-member method E|(dynamic it) → self::E
+static inline-class-member method E|(dynamic it) → self::E /* = self::A<Never> */
   ;
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = self::A<Never> */
   return self::E|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.weak.transformed.expect
index 302a8814089..aab7d029062 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/supertype_conflict.dart.weak.transformed.expect
@@ -26,7 +26,7 @@ extension type C<T extends core::Object? = dynamic>(self::A<T%> it) {
   constructor • = self::C|;
   tearoff • = self::C|_#new#tearOff;
 }
-extension type D(self::A<Never> it) implements self::A<core::int>, self::B<core::String> {
+extension type D(self::A<Never> it) implements self::A<core::int>, self::B<core::String> /* = self::A<core::String> */ {
   constructor • = self::D|;
   tearoff • = self::D|_#new#tearOff;
 }
@@ -34,27 +34,27 @@ extension type E(self::A<Never> it) {
   constructor • = self::E|;
   tearoff • = self::E|_#new#tearOff;
 }
-static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|::T%> /* = self::A<self::B|::T%> */ {
+  lowered final self::B<self::B|::T%> /* = self::A<self::B|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::B<self::B|_#new#tearOff::T%> /* = self::A<self::B|_#new#tearOff::T%> */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> {
-  lowered final self::C<self::C|::T%> #this = it;
+static inline-class-member method C|<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|::T%> /* = self::A<self::C|::T%> */ {
+  lowered final self::C<self::C|::T%> /* = self::A<self::C|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%>
+static inline-class-member method C|_#new#tearOff<T extends core::Object? = dynamic>(dynamic it) → self::C<self::C|_#new#tearOff::T%> /* = self::A<self::C|_#new#tearOff::T%> */
   return self::C|<self::C|_#new#tearOff::T%>(it);
-static inline-class-member method D|(dynamic it) → self::D {
-  lowered final self::D #this = it;
+static inline-class-member method D|(dynamic it) → self::D /* = self::A<Never> */ {
+  lowered final self::D /* = self::A<Never> */ #this = it;
   return #this;
 }
-static inline-class-member method D|_#new#tearOff(dynamic it) → self::D
+static inline-class-member method D|_#new#tearOff(dynamic it) → self::D /* = self::A<Never> */
   return self::D|(it);
-static inline-class-member method E|(dynamic it) → self::E {
-  lowered final self::E #this = it;
+static inline-class-member method E|(dynamic it) → self::E /* = self::A<Never> */ {
+  lowered final self::E /* = self::A<Never> */ #this = it;
   return #this;
 }
-static inline-class-member method E|_#new#tearOff(dynamic it) → self::E
+static inline-class-member method E|_#new#tearOff(dynamic it) → self::E /* = self::A<Never> */
   return self::E|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.strong.expect b/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.strong.expect
index 67d34392811..55bc3e3cb98 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.strong.expect
@@ -16,9 +16,9 @@ extension type Extension(invalid-type it) {
   constructor • = self::Extension|;
   tearoff • = self::Extension|_#new#tearOff;
 }
-static inline-class-member method Extension|(dynamic it) → self::Extension {
-  lowered final self::Extension #this = it;
+static inline-class-member method Extension|(dynamic it) → self::Extension /* = invalid-type */ {
+  lowered final self::Extension /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method Extension|_#new#tearOff(dynamic it) → self::Extension
+static inline-class-member method Extension|_#new#tearOff(dynamic it) → self::Extension /* = invalid-type */
   return self::Extension|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.strong.transformed.expect
index 67d34392811..55bc3e3cb98 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.strong.transformed.expect
@@ -16,9 +16,9 @@ extension type Extension(invalid-type it) {
   constructor • = self::Extension|;
   tearoff • = self::Extension|_#new#tearOff;
 }
-static inline-class-member method Extension|(dynamic it) → self::Extension {
-  lowered final self::Extension #this = it;
+static inline-class-member method Extension|(dynamic it) → self::Extension /* = invalid-type */ {
+  lowered final self::Extension /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method Extension|_#new#tearOff(dynamic it) → self::Extension
+static inline-class-member method Extension|_#new#tearOff(dynamic it) → self::Extension /* = invalid-type */
   return self::Extension|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.weak.expect b/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.weak.expect
index 67d34392811..55bc3e3cb98 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.weak.expect
@@ -16,9 +16,9 @@ extension type Extension(invalid-type it) {
   constructor • = self::Extension|;
   tearoff • = self::Extension|_#new#tearOff;
 }
-static inline-class-member method Extension|(dynamic it) → self::Extension {
-  lowered final self::Extension #this = it;
+static inline-class-member method Extension|(dynamic it) → self::Extension /* = invalid-type */ {
+  lowered final self::Extension /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method Extension|_#new#tearOff(dynamic it) → self::Extension
+static inline-class-member method Extension|_#new#tearOff(dynamic it) → self::Extension /* = invalid-type */
   return self::Extension|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.weak.modular.expect
index 67d34392811..55bc3e3cb98 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.weak.modular.expect
@@ -16,9 +16,9 @@ extension type Extension(invalid-type it) {
   constructor • = self::Extension|;
   tearoff • = self::Extension|_#new#tearOff;
 }
-static inline-class-member method Extension|(dynamic it) → self::Extension {
-  lowered final self::Extension #this = it;
+static inline-class-member method Extension|(dynamic it) → self::Extension /* = invalid-type */ {
+  lowered final self::Extension /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method Extension|_#new#tearOff(dynamic it) → self::Extension
+static inline-class-member method Extension|_#new#tearOff(dynamic it) → self::Extension /* = invalid-type */
   return self::Extension|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.weak.outline.expect
index 2f6c952b174..510f4e4d926 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.weak.outline.expect
@@ -12,7 +12,7 @@ extension type Extension(invalid-type it) {
   constructor • = self::Extension|;
   tearoff • = self::Extension|_#new#tearOff;
 }
-static inline-class-member method Extension|(dynamic it) → self::Extension
+static inline-class-member method Extension|(dynamic it) → self::Extension /* = invalid-type */
   ;
-static inline-class-member method Extension|_#new#tearOff(dynamic it) → self::Extension
+static inline-class-member method Extension|_#new#tearOff(dynamic it) → self::Extension /* = invalid-type */
   return self::Extension|(it);
diff --git a/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.weak.transformed.expect
index 67d34392811..55bc3e3cb98 100644
--- a/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/extension_types/unresolved_type_extension_type_this.dart.weak.transformed.expect
@@ -16,9 +16,9 @@ extension type Extension(invalid-type it) {
   constructor • = self::Extension|;
   tearoff • = self::Extension|_#new#tearOff;
 }
-static inline-class-member method Extension|(dynamic it) → self::Extension {
-  lowered final self::Extension #this = it;
+static inline-class-member method Extension|(dynamic it) → self::Extension /* = invalid-type */ {
+  lowered final self::Extension /* = invalid-type */ #this = it;
   return #this;
 }
-static inline-class-member method Extension|_#new#tearOff(dynamic it) → self::Extension
+static inline-class-member method Extension|_#new#tearOff(dynamic it) → self::Extension /* = invalid-type */
   return self::Extension|(it);
diff --git a/pkg/front_end/testcases/inline_class/external.dart.strong.expect b/pkg/front_end/testcases/inline_class/external.dart.strong.expect
index fd0b9dce228..b71fffda71d 100644
--- a/pkg/front_end/testcases/inline_class/external.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/external.dart.strong.expect
@@ -27,36 +27,36 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
 external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = self::B|(a);
-  self::B b2 = self::B|named(0);
+  self::B /* = self::A */ b1 = self::B|(a);
+  self::B /* = self::A */ b2 = self::B|named(0);
   a = self::B|get#field(b1);
   self::B|set#field(b1, a);
   a = self::B|method(b1);
   () → self::A f1 = self::B|get#method(b1);
-  b2 = self::B|genericMethod<self::B>(b2, b2);
+  b2 = self::B|genericMethod<self::B /* = self::A */>(b2, b2);
   <T extends core::Object? = dynamic>(T%) → T% f2 = self::B|get#genericMethod(b2);
   (core::int) → core::int f3 = self::B|get#genericMethod(b2)<core::int>;
   b1 = self::B|get#getter(b2);
@@ -65,7 +65,7 @@ static method method(self::A a) → void {
   self::B|staticField = a;
   a = self::B|staticMethod();
   () → self::A f4 = #C1;
-  b2 = self::B|staticGenericMethod<self::B>(b2);
+  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
   <T extends core::Object? = dynamic>(T%) → T% f5 = #C2;
   (core::String) → core::String f6 = #C3;
   b1 = self::B|staticGetter;
diff --git a/pkg/front_end/testcases/inline_class/external.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/external.dart.strong.transformed.expect
index fd0b9dce228..b71fffda71d 100644
--- a/pkg/front_end/testcases/inline_class/external.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/external.dart.strong.transformed.expect
@@ -27,36 +27,36 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
 external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = self::B|(a);
-  self::B b2 = self::B|named(0);
+  self::B /* = self::A */ b1 = self::B|(a);
+  self::B /* = self::A */ b2 = self::B|named(0);
   a = self::B|get#field(b1);
   self::B|set#field(b1, a);
   a = self::B|method(b1);
   () → self::A f1 = self::B|get#method(b1);
-  b2 = self::B|genericMethod<self::B>(b2, b2);
+  b2 = self::B|genericMethod<self::B /* = self::A */>(b2, b2);
   <T extends core::Object? = dynamic>(T%) → T% f2 = self::B|get#genericMethod(b2);
   (core::int) → core::int f3 = self::B|get#genericMethod(b2)<core::int>;
   b1 = self::B|get#getter(b2);
@@ -65,7 +65,7 @@ static method method(self::A a) → void {
   self::B|staticField = a;
   a = self::B|staticMethod();
   () → self::A f4 = #C1;
-  b2 = self::B|staticGenericMethod<self::B>(b2);
+  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
   <T extends core::Object? = dynamic>(T%) → T% f5 = #C2;
   (core::String) → core::String f6 = #C3;
   b1 = self::B|staticGetter;
diff --git a/pkg/front_end/testcases/inline_class/external.dart.weak.expect b/pkg/front_end/testcases/inline_class/external.dart.weak.expect
index 871cadbba0e..fc3037a9b73 100644
--- a/pkg/front_end/testcases/inline_class/external.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/external.dart.weak.expect
@@ -27,36 +27,36 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
 external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = self::B|(a);
-  self::B b2 = self::B|named(0);
+  self::B /* = self::A */ b1 = self::B|(a);
+  self::B /* = self::A */ b2 = self::B|named(0);
   a = self::B|get#field(b1);
   self::B|set#field(b1, a);
   a = self::B|method(b1);
   () → self::A f1 = self::B|get#method(b1);
-  b2 = self::B|genericMethod<self::B>(b2, b2);
+  b2 = self::B|genericMethod<self::B /* = self::A */>(b2, b2);
   <T extends core::Object? = dynamic>(T%) → T% f2 = self::B|get#genericMethod(b2);
   (core::int) → core::int f3 = self::B|get#genericMethod(b2)<core::int>;
   b1 = self::B|get#getter(b2);
@@ -65,7 +65,7 @@ static method method(self::A a) → void {
   self::B|staticField = a;
   a = self::B|staticMethod();
   () → self::A f4 = #C1;
-  b2 = self::B|staticGenericMethod<self::B>(b2);
+  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
   <T extends core::Object? = dynamic>(T%) → T% f5 = #C2;
   (core::String) → core::String f6 = #C3;
   b1 = self::B|staticGetter;
diff --git a/pkg/front_end/testcases/inline_class/external.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/external.dart.weak.modular.expect
index 871cadbba0e..fc3037a9b73 100644
--- a/pkg/front_end/testcases/inline_class/external.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/external.dart.weak.modular.expect
@@ -27,36 +27,36 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
 external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = self::B|(a);
-  self::B b2 = self::B|named(0);
+  self::B /* = self::A */ b1 = self::B|(a);
+  self::B /* = self::A */ b2 = self::B|named(0);
   a = self::B|get#field(b1);
   self::B|set#field(b1, a);
   a = self::B|method(b1);
   () → self::A f1 = self::B|get#method(b1);
-  b2 = self::B|genericMethod<self::B>(b2, b2);
+  b2 = self::B|genericMethod<self::B /* = self::A */>(b2, b2);
   <T extends core::Object? = dynamic>(T%) → T% f2 = self::B|get#genericMethod(b2);
   (core::int) → core::int f3 = self::B|get#genericMethod(b2)<core::int>;
   b1 = self::B|get#getter(b2);
@@ -65,7 +65,7 @@ static method method(self::A a) → void {
   self::B|staticField = a;
   a = self::B|staticMethod();
   () → self::A f4 = #C1;
-  b2 = self::B|staticGenericMethod<self::B>(b2);
+  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
   <T extends core::Object? = dynamic>(T%) → T% f5 = #C2;
   (core::String) → core::String f6 = #C3;
   b1 = self::B|staticGetter;
diff --git a/pkg/front_end/testcases/inline_class/external.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/external.dart.weak.outline.expect
index 1610c586c03..f3df24852d7 100644
--- a/pkg/front_end/testcases/inline_class/external.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/external.dart.weak.outline.expect
@@ -26,27 +26,27 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
 external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/external.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/external.dart.weak.transformed.expect
index 871cadbba0e..fc3037a9b73 100644
--- a/pkg/front_end/testcases/inline_class/external.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/external.dart.weak.transformed.expect
@@ -27,36 +27,36 @@ extension type B(self::A a) {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static inline-class-member method B|(self::A a) → self::B;
-static inline-class-member method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B /* = self::A */;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B /* = self::A */
   return self::B|(a);
-external static inline-class-member method B|named(core::int i) → self::B;
-static inline-class-member method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B /* = self::A */;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B /* = self::A */
   return self::B|named(i);
 external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
 external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static inline-class-member method B|method(lowered final self::B #this) → self::A;
-static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B /* = self::A */ #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B /* = self::A */ #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
-external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
+external static inline-class-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
 external static inline-class-member get B|staticField() → self::A;
 external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
 external static inline-class-member method B|staticMethod() → self::A;
 external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static inline-class-member get B|staticGetter() → self::B;
-external static inline-class-member set B|staticSetter(self::B b) → void;
+external static inline-class-member get B|staticGetter() → self::B /* = self::A */;
+external static inline-class-member set B|staticSetter(self::B /* = self::A */ b) → void;
 static method method(self::A a) → void {
-  self::B b1 = self::B|(a);
-  self::B b2 = self::B|named(0);
+  self::B /* = self::A */ b1 = self::B|(a);
+  self::B /* = self::A */ b2 = self::B|named(0);
   a = self::B|get#field(b1);
   self::B|set#field(b1, a);
   a = self::B|method(b1);
   () → self::A f1 = self::B|get#method(b1);
-  b2 = self::B|genericMethod<self::B>(b2, b2);
+  b2 = self::B|genericMethod<self::B /* = self::A */>(b2, b2);
   <T extends core::Object? = dynamic>(T%) → T% f2 = self::B|get#genericMethod(b2);
   (core::int) → core::int f3 = self::B|get#genericMethod(b2)<core::int>;
   b1 = self::B|get#getter(b2);
@@ -65,7 +65,7 @@ static method method(self::A a) → void {
   self::B|staticField = a;
   a = self::B|staticMethod();
   () → self::A f4 = #C1;
-  b2 = self::B|staticGenericMethod<self::B>(b2);
+  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
   <T extends core::Object? = dynamic>(T%) → T% f5 = #C2;
   (core::String) → core::String f6 = #C3;
   b1 = self::B|staticGetter;
diff --git a/pkg/front_end/testcases/inline_class/field_access.dart.strong.expect b/pkg/front_end/testcases/inline_class/field_access.dart.strong.expect
index 800705fe1ab..31e5e2cf150 100644
--- a/pkg/front_end/testcases/inline_class/field_access.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/field_access.dart.strong.expect
@@ -337,13 +337,13 @@ extension type ErroneousInlineClass(core::int a) {
   tearoff • = self::ErroneousInlineClass|_#new#tearOff;
 }
 static extension-member method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
-static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → void {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:19:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -363,15 +363,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = 42; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = 42;
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → void
   return () → void => self::InlineClass|test(#this);
-static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
-  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> #this = it;
+static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ {
+  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
+static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%> /* = self::GenericInlineClass|_#new#tearOff::T% */
   return self::GenericInlineClass|<self::GenericInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
+static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> /* = self::GenericInlineClass|test::T% */ #this, self::GenericInlineClass|test::T% t) → void {
   self::GenericInlineClass|test::T% a1 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   self::GenericInlineClass|test::T% a2 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:34:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T'.
@@ -391,15 +391,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = t; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = t;
 }
-static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
+static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> /* = self::GenericInlineClass|get#test::T% */ #this) → (self::GenericInlineClass|get#test::T%) → void
   return (self::GenericInlineClass|get#test::T% t) → void => self::GenericInlineClass|test<self::GenericInlineClass|get#test::T%>(#this, t);
-static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
-  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> #this = it;
+static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ {
+  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
+static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%> /* = () → self::FunctionInlineClass|_#new#tearOff::T% */
   return self::FunctionInlineClass|<self::FunctionInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
+static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> /* = () → self::FunctionInlineClass|test::T% */ #this, () → self::FunctionInlineClass|test::T% t) → void {
   () → self::FunctionInlineClass|test::T% a1 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   () → self::FunctionInlineClass|test::T% a2 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:49:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T Function()'.
@@ -423,15 +423,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   self::FunctionInlineClass|test::T% d3 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
   self::FunctionInlineClass|test::T% d4 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
 }
-static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
+static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> /* = () → self::FunctionInlineClass|get#test::T% */ #this) → (() → self::FunctionInlineClass|get#test::T%) → void
   return (() → self::FunctionInlineClass|get#test::T% t) → void => self::FunctionInlineClass|test<self::FunctionInlineClass|get#test::T%>(#this, t);
-static inline-class-member method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass {
-  lowered final self::GenericFunctionInlineClass #this = it;
+static inline-class-member method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ {
+  lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */
   return self::GenericFunctionInlineClass|(it);
-static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
+static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → void {
   <T extends core::Object? = dynamic>() → T% a1 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   <T extends core::Object? = dynamic>() → T% a2 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   () → core::int a3 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>;
@@ -459,15 +459,15 @@ Try correcting the name to the name of an existing getter, or defining a getter
   core::int e1 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
   core::int e2 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
 }
-static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
+static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → () → void
   return () → void => self::GenericFunctionInlineClass|test(#this);
-static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
-  lowered final self::DynamicInlineClass #this = it;
+static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass /* = dynamic */ {
+  lowered final self::DynamicInlineClass /* = dynamic */ #this = it;
   return #this;
 }
-static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass /* = dynamic */
   return self::DynamicInlineClass|(it);
-static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
+static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → void {
   dynamic a1 = #this as{Unchecked} dynamic;
   dynamic a2 = #this as{Unchecked} dynamic;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:92:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
@@ -491,15 +491,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   dynamic d3 = (#this as{Unchecked} dynamic){dynamic}.call();
   dynamic d4 = (#this as{Unchecked} dynamic){dynamic}.call();
 }
-static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
+static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → () → void
   return () → void => self::DynamicInlineClass|test(#this);
-static inline-class-member method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass {
-  lowered final self::ErroneousInlineClass #this = b;
+static inline-class-member method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass /* = core::int */ {
+  lowered final self::ErroneousInlineClass /* = core::int */ #this = b;
   return #this;
 }
-static inline-class-member method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass /* = core::int */
   return self::ErroneousInlineClass|(a, b);
-static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
+static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   dynamic a3 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:112:19: Error: The getter 'b' isn't defined for the class 'ErroneousInlineClass'.
@@ -575,9 +575,9 @@ Try correcting the name to the name of an existing getter, or defining a getter
     var e4 = b.call(); // Error
              ^" in #this{<unresolved>}.b{dynamic}.call();
 }
-static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
+static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → () → void
   return () → void => self::ErroneousInlineClass|test(#this);
-static method test(self::InlineClass inlineClass, self::GenericInlineClass<core::String> genericInlineClass, self::FunctionInlineClass<core::String> functionInlineClass, self::GenericFunctionInlineClass genericFunctionInlineClass, self::DynamicInlineClass dynamicInlineClass, self::ErroneousInlineClass erroneousInlineClass, #lib1::PrivateInlineClass privateInlineClass) → void {
+static method test(self::InlineClass /* = core::int */ inlineClass, self::GenericInlineClass<core::String> /* = core::String */ genericInlineClass, self::FunctionInlineClass<core::String> /* = () → core::String */ functionInlineClass, self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ genericFunctionInlineClass, self::DynamicInlineClass /* = dynamic */ dynamicInlineClass, self::ErroneousInlineClass /* = core::int */ erroneousInlineClass, #lib1::PrivateInlineClass /* = core::int */ privateInlineClass) → void {
   core::int a1 = inlineClass as{Unchecked} core::int;
   invalid-type a2 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:143:26: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
 Try changing the operand or remove the type arguments.
@@ -694,13 +694,13 @@ extension type PrivateInlineClass(core::int _it) {
   constructor • = self2::PrivateInlineClass|;
   tearoff • = self2::PrivateInlineClass|_#new#tearOff;
 }
-static inline-class-member method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass {
-  lowered final self2::PrivateInlineClass #this = _it;
+static inline-class-member method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass /* = core::int */ {
+  lowered final self2::PrivateInlineClass /* = core::int */ #this = _it;
   return #this;
 }
-static inline-class-member method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass /* = core::int */
   return self2::PrivateInlineClass|(_it);
-static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
+static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access_lib.dart:13:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -720,5 +720,5 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = _it = 42; // Error, should not resolve to extension method.
              ^^^" in #this{<unresolved>}._it = 42;
 }
-static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
+static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → () → void
   return () → void => self2::PrivateInlineClass|test(#this);
diff --git a/pkg/front_end/testcases/inline_class/field_access.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/field_access.dart.strong.transformed.expect
index 800705fe1ab..31e5e2cf150 100644
--- a/pkg/front_end/testcases/inline_class/field_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/field_access.dart.strong.transformed.expect
@@ -337,13 +337,13 @@ extension type ErroneousInlineClass(core::int a) {
   tearoff • = self::ErroneousInlineClass|_#new#tearOff;
 }
 static extension-member method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
-static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → void {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:19:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -363,15 +363,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = 42; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = 42;
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → void
   return () → void => self::InlineClass|test(#this);
-static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
-  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> #this = it;
+static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ {
+  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
+static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%> /* = self::GenericInlineClass|_#new#tearOff::T% */
   return self::GenericInlineClass|<self::GenericInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
+static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> /* = self::GenericInlineClass|test::T% */ #this, self::GenericInlineClass|test::T% t) → void {
   self::GenericInlineClass|test::T% a1 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   self::GenericInlineClass|test::T% a2 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:34:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T'.
@@ -391,15 +391,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = t; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = t;
 }
-static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
+static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> /* = self::GenericInlineClass|get#test::T% */ #this) → (self::GenericInlineClass|get#test::T%) → void
   return (self::GenericInlineClass|get#test::T% t) → void => self::GenericInlineClass|test<self::GenericInlineClass|get#test::T%>(#this, t);
-static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
-  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> #this = it;
+static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ {
+  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
+static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%> /* = () → self::FunctionInlineClass|_#new#tearOff::T% */
   return self::FunctionInlineClass|<self::FunctionInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
+static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> /* = () → self::FunctionInlineClass|test::T% */ #this, () → self::FunctionInlineClass|test::T% t) → void {
   () → self::FunctionInlineClass|test::T% a1 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   () → self::FunctionInlineClass|test::T% a2 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:49:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T Function()'.
@@ -423,15 +423,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   self::FunctionInlineClass|test::T% d3 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
   self::FunctionInlineClass|test::T% d4 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
 }
-static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
+static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> /* = () → self::FunctionInlineClass|get#test::T% */ #this) → (() → self::FunctionInlineClass|get#test::T%) → void
   return (() → self::FunctionInlineClass|get#test::T% t) → void => self::FunctionInlineClass|test<self::FunctionInlineClass|get#test::T%>(#this, t);
-static inline-class-member method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass {
-  lowered final self::GenericFunctionInlineClass #this = it;
+static inline-class-member method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ {
+  lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */
   return self::GenericFunctionInlineClass|(it);
-static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
+static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → void {
   <T extends core::Object? = dynamic>() → T% a1 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   <T extends core::Object? = dynamic>() → T% a2 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   () → core::int a3 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>;
@@ -459,15 +459,15 @@ Try correcting the name to the name of an existing getter, or defining a getter
   core::int e1 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
   core::int e2 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
 }
-static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
+static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → () → void
   return () → void => self::GenericFunctionInlineClass|test(#this);
-static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
-  lowered final self::DynamicInlineClass #this = it;
+static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass /* = dynamic */ {
+  lowered final self::DynamicInlineClass /* = dynamic */ #this = it;
   return #this;
 }
-static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass /* = dynamic */
   return self::DynamicInlineClass|(it);
-static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
+static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → void {
   dynamic a1 = #this as{Unchecked} dynamic;
   dynamic a2 = #this as{Unchecked} dynamic;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:92:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
@@ -491,15 +491,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   dynamic d3 = (#this as{Unchecked} dynamic){dynamic}.call();
   dynamic d4 = (#this as{Unchecked} dynamic){dynamic}.call();
 }
-static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
+static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → () → void
   return () → void => self::DynamicInlineClass|test(#this);
-static inline-class-member method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass {
-  lowered final self::ErroneousInlineClass #this = b;
+static inline-class-member method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass /* = core::int */ {
+  lowered final self::ErroneousInlineClass /* = core::int */ #this = b;
   return #this;
 }
-static inline-class-member method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass /* = core::int */
   return self::ErroneousInlineClass|(a, b);
-static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
+static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   dynamic a3 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:112:19: Error: The getter 'b' isn't defined for the class 'ErroneousInlineClass'.
@@ -575,9 +575,9 @@ Try correcting the name to the name of an existing getter, or defining a getter
     var e4 = b.call(); // Error
              ^" in #this{<unresolved>}.b{dynamic}.call();
 }
-static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
+static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → () → void
   return () → void => self::ErroneousInlineClass|test(#this);
-static method test(self::InlineClass inlineClass, self::GenericInlineClass<core::String> genericInlineClass, self::FunctionInlineClass<core::String> functionInlineClass, self::GenericFunctionInlineClass genericFunctionInlineClass, self::DynamicInlineClass dynamicInlineClass, self::ErroneousInlineClass erroneousInlineClass, #lib1::PrivateInlineClass privateInlineClass) → void {
+static method test(self::InlineClass /* = core::int */ inlineClass, self::GenericInlineClass<core::String> /* = core::String */ genericInlineClass, self::FunctionInlineClass<core::String> /* = () → core::String */ functionInlineClass, self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ genericFunctionInlineClass, self::DynamicInlineClass /* = dynamic */ dynamicInlineClass, self::ErroneousInlineClass /* = core::int */ erroneousInlineClass, #lib1::PrivateInlineClass /* = core::int */ privateInlineClass) → void {
   core::int a1 = inlineClass as{Unchecked} core::int;
   invalid-type a2 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:143:26: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
 Try changing the operand or remove the type arguments.
@@ -694,13 +694,13 @@ extension type PrivateInlineClass(core::int _it) {
   constructor • = self2::PrivateInlineClass|;
   tearoff • = self2::PrivateInlineClass|_#new#tearOff;
 }
-static inline-class-member method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass {
-  lowered final self2::PrivateInlineClass #this = _it;
+static inline-class-member method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass /* = core::int */ {
+  lowered final self2::PrivateInlineClass /* = core::int */ #this = _it;
   return #this;
 }
-static inline-class-member method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass /* = core::int */
   return self2::PrivateInlineClass|(_it);
-static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
+static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access_lib.dart:13:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -720,5 +720,5 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = _it = 42; // Error, should not resolve to extension method.
              ^^^" in #this{<unresolved>}._it = 42;
 }
-static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
+static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → () → void
   return () → void => self2::PrivateInlineClass|test(#this);
diff --git a/pkg/front_end/testcases/inline_class/field_access.dart.weak.expect b/pkg/front_end/testcases/inline_class/field_access.dart.weak.expect
index 800705fe1ab..31e5e2cf150 100644
--- a/pkg/front_end/testcases/inline_class/field_access.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/field_access.dart.weak.expect
@@ -337,13 +337,13 @@ extension type ErroneousInlineClass(core::int a) {
   tearoff • = self::ErroneousInlineClass|_#new#tearOff;
 }
 static extension-member method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
-static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → void {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:19:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -363,15 +363,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = 42; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = 42;
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → void
   return () → void => self::InlineClass|test(#this);
-static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
-  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> #this = it;
+static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ {
+  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
+static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%> /* = self::GenericInlineClass|_#new#tearOff::T% */
   return self::GenericInlineClass|<self::GenericInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
+static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> /* = self::GenericInlineClass|test::T% */ #this, self::GenericInlineClass|test::T% t) → void {
   self::GenericInlineClass|test::T% a1 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   self::GenericInlineClass|test::T% a2 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:34:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T'.
@@ -391,15 +391,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = t; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = t;
 }
-static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
+static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> /* = self::GenericInlineClass|get#test::T% */ #this) → (self::GenericInlineClass|get#test::T%) → void
   return (self::GenericInlineClass|get#test::T% t) → void => self::GenericInlineClass|test<self::GenericInlineClass|get#test::T%>(#this, t);
-static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
-  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> #this = it;
+static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ {
+  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
+static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%> /* = () → self::FunctionInlineClass|_#new#tearOff::T% */
   return self::FunctionInlineClass|<self::FunctionInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
+static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> /* = () → self::FunctionInlineClass|test::T% */ #this, () → self::FunctionInlineClass|test::T% t) → void {
   () → self::FunctionInlineClass|test::T% a1 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   () → self::FunctionInlineClass|test::T% a2 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:49:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T Function()'.
@@ -423,15 +423,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   self::FunctionInlineClass|test::T% d3 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
   self::FunctionInlineClass|test::T% d4 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
 }
-static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
+static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> /* = () → self::FunctionInlineClass|get#test::T% */ #this) → (() → self::FunctionInlineClass|get#test::T%) → void
   return (() → self::FunctionInlineClass|get#test::T% t) → void => self::FunctionInlineClass|test<self::FunctionInlineClass|get#test::T%>(#this, t);
-static inline-class-member method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass {
-  lowered final self::GenericFunctionInlineClass #this = it;
+static inline-class-member method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ {
+  lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */
   return self::GenericFunctionInlineClass|(it);
-static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
+static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → void {
   <T extends core::Object? = dynamic>() → T% a1 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   <T extends core::Object? = dynamic>() → T% a2 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   () → core::int a3 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>;
@@ -459,15 +459,15 @@ Try correcting the name to the name of an existing getter, or defining a getter
   core::int e1 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
   core::int e2 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
 }
-static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
+static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → () → void
   return () → void => self::GenericFunctionInlineClass|test(#this);
-static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
-  lowered final self::DynamicInlineClass #this = it;
+static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass /* = dynamic */ {
+  lowered final self::DynamicInlineClass /* = dynamic */ #this = it;
   return #this;
 }
-static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass /* = dynamic */
   return self::DynamicInlineClass|(it);
-static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
+static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → void {
   dynamic a1 = #this as{Unchecked} dynamic;
   dynamic a2 = #this as{Unchecked} dynamic;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:92:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
@@ -491,15 +491,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   dynamic d3 = (#this as{Unchecked} dynamic){dynamic}.call();
   dynamic d4 = (#this as{Unchecked} dynamic){dynamic}.call();
 }
-static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
+static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → () → void
   return () → void => self::DynamicInlineClass|test(#this);
-static inline-class-member method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass {
-  lowered final self::ErroneousInlineClass #this = b;
+static inline-class-member method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass /* = core::int */ {
+  lowered final self::ErroneousInlineClass /* = core::int */ #this = b;
   return #this;
 }
-static inline-class-member method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass /* = core::int */
   return self::ErroneousInlineClass|(a, b);
-static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
+static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   dynamic a3 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:112:19: Error: The getter 'b' isn't defined for the class 'ErroneousInlineClass'.
@@ -575,9 +575,9 @@ Try correcting the name to the name of an existing getter, or defining a getter
     var e4 = b.call(); // Error
              ^" in #this{<unresolved>}.b{dynamic}.call();
 }
-static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
+static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → () → void
   return () → void => self::ErroneousInlineClass|test(#this);
-static method test(self::InlineClass inlineClass, self::GenericInlineClass<core::String> genericInlineClass, self::FunctionInlineClass<core::String> functionInlineClass, self::GenericFunctionInlineClass genericFunctionInlineClass, self::DynamicInlineClass dynamicInlineClass, self::ErroneousInlineClass erroneousInlineClass, #lib1::PrivateInlineClass privateInlineClass) → void {
+static method test(self::InlineClass /* = core::int */ inlineClass, self::GenericInlineClass<core::String> /* = core::String */ genericInlineClass, self::FunctionInlineClass<core::String> /* = () → core::String */ functionInlineClass, self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ genericFunctionInlineClass, self::DynamicInlineClass /* = dynamic */ dynamicInlineClass, self::ErroneousInlineClass /* = core::int */ erroneousInlineClass, #lib1::PrivateInlineClass /* = core::int */ privateInlineClass) → void {
   core::int a1 = inlineClass as{Unchecked} core::int;
   invalid-type a2 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:143:26: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
 Try changing the operand or remove the type arguments.
@@ -694,13 +694,13 @@ extension type PrivateInlineClass(core::int _it) {
   constructor • = self2::PrivateInlineClass|;
   tearoff • = self2::PrivateInlineClass|_#new#tearOff;
 }
-static inline-class-member method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass {
-  lowered final self2::PrivateInlineClass #this = _it;
+static inline-class-member method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass /* = core::int */ {
+  lowered final self2::PrivateInlineClass /* = core::int */ #this = _it;
   return #this;
 }
-static inline-class-member method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass /* = core::int */
   return self2::PrivateInlineClass|(_it);
-static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
+static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access_lib.dart:13:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -720,5 +720,5 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = _it = 42; // Error, should not resolve to extension method.
              ^^^" in #this{<unresolved>}._it = 42;
 }
-static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
+static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → () → void
   return () → void => self2::PrivateInlineClass|test(#this);
diff --git a/pkg/front_end/testcases/inline_class/field_access.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/field_access.dart.weak.modular.expect
index 800705fe1ab..31e5e2cf150 100644
--- a/pkg/front_end/testcases/inline_class/field_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/field_access.dart.weak.modular.expect
@@ -337,13 +337,13 @@ extension type ErroneousInlineClass(core::int a) {
   tearoff • = self::ErroneousInlineClass|_#new#tearOff;
 }
 static extension-member method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
-static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → void {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:19:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -363,15 +363,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = 42; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = 42;
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → void
   return () → void => self::InlineClass|test(#this);
-static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
-  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> #this = it;
+static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ {
+  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
+static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%> /* = self::GenericInlineClass|_#new#tearOff::T% */
   return self::GenericInlineClass|<self::GenericInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
+static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> /* = self::GenericInlineClass|test::T% */ #this, self::GenericInlineClass|test::T% t) → void {
   self::GenericInlineClass|test::T% a1 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   self::GenericInlineClass|test::T% a2 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:34:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T'.
@@ -391,15 +391,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = t; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = t;
 }
-static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
+static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> /* = self::GenericInlineClass|get#test::T% */ #this) → (self::GenericInlineClass|get#test::T%) → void
   return (self::GenericInlineClass|get#test::T% t) → void => self::GenericInlineClass|test<self::GenericInlineClass|get#test::T%>(#this, t);
-static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
-  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> #this = it;
+static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ {
+  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
+static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%> /* = () → self::FunctionInlineClass|_#new#tearOff::T% */
   return self::FunctionInlineClass|<self::FunctionInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
+static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> /* = () → self::FunctionInlineClass|test::T% */ #this, () → self::FunctionInlineClass|test::T% t) → void {
   () → self::FunctionInlineClass|test::T% a1 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   () → self::FunctionInlineClass|test::T% a2 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:49:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T Function()'.
@@ -423,15 +423,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   self::FunctionInlineClass|test::T% d3 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
   self::FunctionInlineClass|test::T% d4 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
 }
-static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
+static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> /* = () → self::FunctionInlineClass|get#test::T% */ #this) → (() → self::FunctionInlineClass|get#test::T%) → void
   return (() → self::FunctionInlineClass|get#test::T% t) → void => self::FunctionInlineClass|test<self::FunctionInlineClass|get#test::T%>(#this, t);
-static inline-class-member method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass {
-  lowered final self::GenericFunctionInlineClass #this = it;
+static inline-class-member method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ {
+  lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */
   return self::GenericFunctionInlineClass|(it);
-static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
+static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → void {
   <T extends core::Object? = dynamic>() → T% a1 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   <T extends core::Object? = dynamic>() → T% a2 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   () → core::int a3 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>;
@@ -459,15 +459,15 @@ Try correcting the name to the name of an existing getter, or defining a getter
   core::int e1 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
   core::int e2 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
 }
-static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
+static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → () → void
   return () → void => self::GenericFunctionInlineClass|test(#this);
-static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
-  lowered final self::DynamicInlineClass #this = it;
+static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass /* = dynamic */ {
+  lowered final self::DynamicInlineClass /* = dynamic */ #this = it;
   return #this;
 }
-static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass /* = dynamic */
   return self::DynamicInlineClass|(it);
-static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
+static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → void {
   dynamic a1 = #this as{Unchecked} dynamic;
   dynamic a2 = #this as{Unchecked} dynamic;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:92:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
@@ -491,15 +491,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   dynamic d3 = (#this as{Unchecked} dynamic){dynamic}.call();
   dynamic d4 = (#this as{Unchecked} dynamic){dynamic}.call();
 }
-static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
+static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → () → void
   return () → void => self::DynamicInlineClass|test(#this);
-static inline-class-member method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass {
-  lowered final self::ErroneousInlineClass #this = b;
+static inline-class-member method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass /* = core::int */ {
+  lowered final self::ErroneousInlineClass /* = core::int */ #this = b;
   return #this;
 }
-static inline-class-member method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass /* = core::int */
   return self::ErroneousInlineClass|(a, b);
-static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
+static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   dynamic a3 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:112:19: Error: The getter 'b' isn't defined for the class 'ErroneousInlineClass'.
@@ -575,9 +575,9 @@ Try correcting the name to the name of an existing getter, or defining a getter
     var e4 = b.call(); // Error
              ^" in #this{<unresolved>}.b{dynamic}.call();
 }
-static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
+static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → () → void
   return () → void => self::ErroneousInlineClass|test(#this);
-static method test(self::InlineClass inlineClass, self::GenericInlineClass<core::String> genericInlineClass, self::FunctionInlineClass<core::String> functionInlineClass, self::GenericFunctionInlineClass genericFunctionInlineClass, self::DynamicInlineClass dynamicInlineClass, self::ErroneousInlineClass erroneousInlineClass, #lib1::PrivateInlineClass privateInlineClass) → void {
+static method test(self::InlineClass /* = core::int */ inlineClass, self::GenericInlineClass<core::String> /* = core::String */ genericInlineClass, self::FunctionInlineClass<core::String> /* = () → core::String */ functionInlineClass, self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ genericFunctionInlineClass, self::DynamicInlineClass /* = dynamic */ dynamicInlineClass, self::ErroneousInlineClass /* = core::int */ erroneousInlineClass, #lib1::PrivateInlineClass /* = core::int */ privateInlineClass) → void {
   core::int a1 = inlineClass as{Unchecked} core::int;
   invalid-type a2 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:143:26: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
 Try changing the operand or remove the type arguments.
@@ -694,13 +694,13 @@ extension type PrivateInlineClass(core::int _it) {
   constructor • = self2::PrivateInlineClass|;
   tearoff • = self2::PrivateInlineClass|_#new#tearOff;
 }
-static inline-class-member method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass {
-  lowered final self2::PrivateInlineClass #this = _it;
+static inline-class-member method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass /* = core::int */ {
+  lowered final self2::PrivateInlineClass /* = core::int */ #this = _it;
   return #this;
 }
-static inline-class-member method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass /* = core::int */
   return self2::PrivateInlineClass|(_it);
-static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
+static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access_lib.dart:13:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -720,5 +720,5 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = _it = 42; // Error, should not resolve to extension method.
              ^^^" in #this{<unresolved>}._it = 42;
 }
-static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
+static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → () → void
   return () → void => self2::PrivateInlineClass|test(#this);
diff --git a/pkg/front_end/testcases/inline_class/field_access.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/field_access.dart.weak.outline.expect
index ec6b1120868..edb97556fa3 100644
--- a/pkg/front_end/testcases/inline_class/field_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/field_access.dart.weak.outline.expect
@@ -45,55 +45,55 @@ extension type ErroneousInlineClass(core::int a) {
 }
 static extension-member method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void
   ;
-static inline-class-member method InlineClass|(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass /* = core::int */
   ;
-static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → void
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → void
   ;
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → void
   return () → void => self::InlineClass|test(#this);
-static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%>
+static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */
   ;
-static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
+static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%> /* = self::GenericInlineClass|_#new#tearOff::T% */
   return self::GenericInlineClass|<self::GenericInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void
+static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> /* = self::GenericInlineClass|test::T% */ #this, self::GenericInlineClass|test::T% t) → void
   ;
-static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
+static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> /* = self::GenericInlineClass|get#test::T% */ #this) → (self::GenericInlineClass|get#test::T%) → void
   return (self::GenericInlineClass|get#test::T% t) → void => self::GenericInlineClass|test<self::GenericInlineClass|get#test::T%>(#this, t);
-static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%>
+static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */
   ;
-static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
+static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%> /* = () → self::FunctionInlineClass|_#new#tearOff::T% */
   return self::FunctionInlineClass|<self::FunctionInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void
+static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> /* = () → self::FunctionInlineClass|test::T% */ #this, () → self::FunctionInlineClass|test::T% t) → void
   ;
-static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
+static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> /* = () → self::FunctionInlineClass|get#test::T% */ #this) → (() → self::FunctionInlineClass|get#test::T%) → void
   return (() → self::FunctionInlineClass|get#test::T% t) → void => self::FunctionInlineClass|test<self::FunctionInlineClass|get#test::T%>(#this, t);
-static inline-class-member method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */
   ;
-static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */
   return self::GenericFunctionInlineClass|(it);
-static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void
+static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → void
   ;
-static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
+static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → () → void
   return () → void => self::GenericFunctionInlineClass|test(#this);
-static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass /* = dynamic */
   ;
-static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass /* = dynamic */
   return self::DynamicInlineClass|(it);
-static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void
+static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → void
   ;
-static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
+static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → () → void
   return () → void => self::DynamicInlineClass|test(#this);
-static inline-class-member method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass /* = core::int */
   ;
-static inline-class-member method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass /* = core::int */
   return self::ErroneousInlineClass|(a, b);
-static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void
+static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → void
   ;
-static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
+static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → () → void
   return () → void => self::ErroneousInlineClass|test(#this);
-static method test(self::InlineClass inlineClass, self::GenericInlineClass<core::String> genericInlineClass, self::FunctionInlineClass<core::String> functionInlineClass, self::GenericFunctionInlineClass genericFunctionInlineClass, self::DynamicInlineClass dynamicInlineClass, self::ErroneousInlineClass erroneousInlineClass, #lib1::PrivateInlineClass privateInlineClass) → void
+static method test(self::InlineClass /* = core::int */ inlineClass, self::GenericInlineClass<core::String> /* = core::String */ genericInlineClass, self::FunctionInlineClass<core::String> /* = () → core::String */ functionInlineClass, self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ genericFunctionInlineClass, self::DynamicInlineClass /* = dynamic */ dynamicInlineClass, self::ErroneousInlineClass /* = core::int */ erroneousInlineClass, #lib1::PrivateInlineClass /* = core::int */ privateInlineClass) → void
   ;
 
 library;
@@ -106,11 +106,11 @@ extension type PrivateInlineClass(core::int _it) {
   constructor • = self2::PrivateInlineClass|;
   tearoff • = self2::PrivateInlineClass|_#new#tearOff;
 }
-static inline-class-member method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass /* = core::int */
   ;
-static inline-class-member method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass /* = core::int */
   return self2::PrivateInlineClass|(_it);
-static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void
+static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → void
   ;
-static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
+static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → () → void
   return () → void => self2::PrivateInlineClass|test(#this);
diff --git a/pkg/front_end/testcases/inline_class/field_access.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/field_access.dart.weak.transformed.expect
index 800705fe1ab..31e5e2cf150 100644
--- a/pkg/front_end/testcases/inline_class/field_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/field_access.dart.weak.transformed.expect
@@ -337,13 +337,13 @@ extension type ErroneousInlineClass(core::int a) {
   tearoff • = self::ErroneousInlineClass|_#new#tearOff;
 }
 static extension-member method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
-static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → void {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:19:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -363,15 +363,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = 42; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = 42;
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → void
   return () → void => self::InlineClass|test(#this);
-static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
-  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> #this = it;
+static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ {
+  lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> /* = self::GenericInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
+static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%> /* = self::GenericInlineClass|_#new#tearOff::T% */
   return self::GenericInlineClass|<self::GenericInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
+static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> /* = self::GenericInlineClass|test::T% */ #this, self::GenericInlineClass|test::T% t) → void {
   self::GenericInlineClass|test::T% a1 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   self::GenericInlineClass|test::T% a2 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:34:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T'.
@@ -391,15 +391,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = t; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = t;
 }
-static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
+static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> /* = self::GenericInlineClass|get#test::T% */ #this) → (self::GenericInlineClass|get#test::T%) → void
   return (self::GenericInlineClass|get#test::T% t) → void => self::GenericInlineClass|test<self::GenericInlineClass|get#test::T%>(#this, t);
-static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
-  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> #this = it;
+static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ {
+  lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> /* = () → self::FunctionInlineClass|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
+static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%> /* = () → self::FunctionInlineClass|_#new#tearOff::T% */
   return self::FunctionInlineClass|<self::FunctionInlineClass|_#new#tearOff::T%>(it);
-static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
+static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> /* = () → self::FunctionInlineClass|test::T% */ #this, () → self::FunctionInlineClass|test::T% t) → void {
   () → self::FunctionInlineClass|test::T% a1 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   () → self::FunctionInlineClass|test::T% a2 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:49:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T Function()'.
@@ -423,15 +423,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   self::FunctionInlineClass|test::T% d3 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
   self::FunctionInlineClass|test::T% d4 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
 }
-static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
+static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> /* = () → self::FunctionInlineClass|get#test::T% */ #this) → (() → self::FunctionInlineClass|get#test::T%) → void
   return (() → self::FunctionInlineClass|get#test::T% t) → void => self::FunctionInlineClass|test<self::FunctionInlineClass|get#test::T%>(#this, t);
-static inline-class-member method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass {
-  lowered final self::GenericFunctionInlineClass #this = it;
+static inline-class-member method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ {
+  lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this = it;
   return #this;
 }
-static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */
   return self::GenericFunctionInlineClass|(it);
-static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
+static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → void {
   <T extends core::Object? = dynamic>() → T% a1 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   <T extends core::Object? = dynamic>() → T% a2 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   () → core::int a3 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>;
@@ -459,15 +459,15 @@ Try correcting the name to the name of an existing getter, or defining a getter
   core::int e1 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
   core::int e2 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
 }
-static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
+static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ #this) → () → void
   return () → void => self::GenericFunctionInlineClass|test(#this);
-static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
-  lowered final self::DynamicInlineClass #this = it;
+static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass /* = dynamic */ {
+  lowered final self::DynamicInlineClass /* = dynamic */ #this = it;
   return #this;
 }
-static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass /* = dynamic */
   return self::DynamicInlineClass|(it);
-static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
+static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → void {
   dynamic a1 = #this as{Unchecked} dynamic;
   dynamic a2 = #this as{Unchecked} dynamic;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:92:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
@@ -491,15 +491,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   dynamic d3 = (#this as{Unchecked} dynamic){dynamic}.call();
   dynamic d4 = (#this as{Unchecked} dynamic){dynamic}.call();
 }
-static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
+static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass /* = dynamic */ #this) → () → void
   return () → void => self::DynamicInlineClass|test(#this);
-static inline-class-member method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass {
-  lowered final self::ErroneousInlineClass #this = b;
+static inline-class-member method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass /* = core::int */ {
+  lowered final self::ErroneousInlineClass /* = core::int */ #this = b;
   return #this;
 }
-static inline-class-member method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass /* = core::int */
   return self::ErroneousInlineClass|(a, b);
-static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
+static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   dynamic a3 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:112:19: Error: The getter 'b' isn't defined for the class 'ErroneousInlineClass'.
@@ -575,9 +575,9 @@ Try correcting the name to the name of an existing getter, or defining a getter
     var e4 = b.call(); // Error
              ^" in #this{<unresolved>}.b{dynamic}.call();
 }
-static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
+static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass /* = core::int */ #this) → () → void
   return () → void => self::ErroneousInlineClass|test(#this);
-static method test(self::InlineClass inlineClass, self::GenericInlineClass<core::String> genericInlineClass, self::FunctionInlineClass<core::String> functionInlineClass, self::GenericFunctionInlineClass genericFunctionInlineClass, self::DynamicInlineClass dynamicInlineClass, self::ErroneousInlineClass erroneousInlineClass, #lib1::PrivateInlineClass privateInlineClass) → void {
+static method test(self::InlineClass /* = core::int */ inlineClass, self::GenericInlineClass<core::String> /* = core::String */ genericInlineClass, self::FunctionInlineClass<core::String> /* = () → core::String */ functionInlineClass, self::GenericFunctionInlineClass /* = <T extends core::Object? = dynamic>() → T% */ genericFunctionInlineClass, self::DynamicInlineClass /* = dynamic */ dynamicInlineClass, self::ErroneousInlineClass /* = core::int */ erroneousInlineClass, #lib1::PrivateInlineClass /* = core::int */ privateInlineClass) → void {
   core::int a1 = inlineClass as{Unchecked} core::int;
   invalid-type a2 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:143:26: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
 Try changing the operand or remove the type arguments.
@@ -694,13 +694,13 @@ extension type PrivateInlineClass(core::int _it) {
   constructor • = self2::PrivateInlineClass|;
   tearoff • = self2::PrivateInlineClass|_#new#tearOff;
 }
-static inline-class-member method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass {
-  lowered final self2::PrivateInlineClass #this = _it;
+static inline-class-member method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass /* = core::int */ {
+  lowered final self2::PrivateInlineClass /* = core::int */ #this = _it;
   return #this;
 }
-static inline-class-member method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass /* = core::int */
   return self2::PrivateInlineClass|(_it);
-static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
+static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access_lib.dart:13:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -720,5 +720,5 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = _it = 42; // Error, should not resolve to extension method.
              ^^^" in #this{<unresolved>}._it = 42;
 }
-static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
+static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass /* = core::int */ #this) → () → void
   return () → void => self2::PrivateInlineClass|test(#this);
diff --git a/pkg/front_end/testcases/inline_class/has_export.dart.strong.expect b/pkg/front_end/testcases/inline_class/has_export.dart.strong.expect
index 2d79433486f..ac457c496fe 100644
--- a/pkg/front_end/testcases/inline_class/has_export.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/has_export.dart.strong.expect
@@ -16,9 +16,9 @@ extension type C(core::int i) { // from org-dartlang-testcase:///has_part_of_lib
   constructor • = has::C|;
   tearoff • = has::_#new#tearOff;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C {
-  lowered final has::C #this = i;
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C /* = core::int */ {
+  lowered final has::C /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C /* = core::int */
   return has::C|(i);
diff --git a/pkg/front_end/testcases/inline_class/has_export.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/has_export.dart.strong.transformed.expect
index 2d79433486f..ac457c496fe 100644
--- a/pkg/front_end/testcases/inline_class/has_export.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/has_export.dart.strong.transformed.expect
@@ -16,9 +16,9 @@ extension type C(core::int i) { // from org-dartlang-testcase:///has_part_of_lib
   constructor • = has::C|;
   tearoff • = has::_#new#tearOff;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C {
-  lowered final has::C #this = i;
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C /* = core::int */ {
+  lowered final has::C /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C /* = core::int */
   return has::C|(i);
diff --git a/pkg/front_end/testcases/inline_class/has_export.dart.weak.expect b/pkg/front_end/testcases/inline_class/has_export.dart.weak.expect
index 2d79433486f..ac457c496fe 100644
--- a/pkg/front_end/testcases/inline_class/has_export.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/has_export.dart.weak.expect
@@ -16,9 +16,9 @@ extension type C(core::int i) { // from org-dartlang-testcase:///has_part_of_lib
   constructor • = has::C|;
   tearoff • = has::_#new#tearOff;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C {
-  lowered final has::C #this = i;
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C /* = core::int */ {
+  lowered final has::C /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C /* = core::int */
   return has::C|(i);
diff --git a/pkg/front_end/testcases/inline_class/has_export.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/has_export.dart.weak.modular.expect
index 2d79433486f..ac457c496fe 100644
--- a/pkg/front_end/testcases/inline_class/has_export.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/has_export.dart.weak.modular.expect
@@ -16,9 +16,9 @@ extension type C(core::int i) { // from org-dartlang-testcase:///has_part_of_lib
   constructor • = has::C|;
   tearoff • = has::_#new#tearOff;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C {
-  lowered final has::C #this = i;
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C /* = core::int */ {
+  lowered final has::C /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C /* = core::int */
   return has::C|(i);
diff --git a/pkg/front_end/testcases/inline_class/has_export.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/has_export.dart.weak.outline.expect
index 0befba66733..2814bf262e7 100644
--- a/pkg/front_end/testcases/inline_class/has_export.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/has_export.dart.weak.outline.expect
@@ -17,7 +17,7 @@ extension type C(core::int i) { // from org-dartlang-testcase:///has_part_of_lib
   constructor • = has::C|;
   tearoff • = has::_#new#tearOff;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C /* = core::int */
   ;
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C /* = core::int */
   return has::C|(i);
diff --git a/pkg/front_end/testcases/inline_class/has_export.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/has_export.dart.weak.transformed.expect
index 2d79433486f..ac457c496fe 100644
--- a/pkg/front_end/testcases/inline_class/has_export.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/has_export.dart.weak.transformed.expect
@@ -16,9 +16,9 @@ extension type C(core::int i) { // from org-dartlang-testcase:///has_part_of_lib
   constructor • = has::C|;
   tearoff • = has::_#new#tearOff;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C {
-  lowered final has::C #this = i;
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C /* = core::int */ {
+  lowered final has::C /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C /* = core::int */
   return has::C|(i);
diff --git a/pkg/front_end/testcases/inline_class/implements.dart.strong.expect b/pkg/front_end/testcases/inline_class/implements.dart.strong.expect
index 4fad823f754..1b7e2ff088c 100644
--- a/pkg/front_end/testcases/inline_class/implements.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/implements.dart.strong.expect
@@ -212,75 +212,75 @@ extension type B<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::B|;
   tearoff • = self::B|_#new#tearOff;
 }
-extension type C1(core::int it) implements self::A {
+extension type C1(core::int it) implements self::A /* = core::int */ {
   method methodC1 = self::C1|methodC1;
   tearoff methodC1 = self::C1|get#methodC1;
   constructor • = self::C1|;
   tearoff • = self::C1|_#new#tearOff;
 }
-extension type C2(core::int it) implements self::A, self::B<core::int> {
+extension type C2(core::int it) implements self::A /* = core::int */, self::B<core::int> /* = core::int */ {
   method methodC2 = self::C2|methodC2;
   tearoff methodC2 = self::C2|get#methodC2;
   constructor • = self::C2|;
   tearoff • = self::C2|_#new#tearOff;
 }
-extension type D1(core::int it) implements self::C1 {
+extension type D1(core::int it) implements self::C1 /* = core::int */ {
   method methodD1 = self::D1|methodD1;
   tearoff methodD1 = self::D1|get#methodD1;
   constructor • = self::D1|;
   tearoff • = self::D1|_#new#tearOff;
 }
-static inline-class-member method A|(core::int it) → self::A {
-  lowered final self::A #this = it;
+static inline-class-member method A|(core::int it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(core::int it) → self::A
+static inline-class-member method A|_#new#tearOff(core::int it) → self::A /* = core::int */
   return self::A|(it);
-static inline-class-member method A|methodA(lowered final self::A #this) → core::int
+static inline-class-member method A|methodA(lowered final self::A /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(5){(core::num) → core::int};
-static inline-class-member method A|get#methodA(lowered final self::A #this) → () → core::int
+static inline-class-member method A|get#methodA(lowered final self::A /* = core::int */ #this) → () → core::int
   return () → core::int => self::A|methodA(#this);
-static inline-class-member method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> /* = self::B|::T% */ {
+  lowered final self::B<self::B|::T%> /* = self::B|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%> /* = self::B|_#new#tearOff::T% */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
+static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> /* = self::B|methodB::T% */ #this) → self::B|methodB::T%
   return #this as{Unchecked} self::B|methodB::T%;
-static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
+static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> /* = self::B|get#methodB::T% */ #this) → () → self::B|get#methodB::T%
   return () → self::B|get#methodB::T% => self::B|methodB<self::B|get#methodB::T%>(#this);
-static inline-class-member method C1|(core::int it) → self::C1 {
-  lowered final self::C1 #this = it;
+static inline-class-member method C1|(core::int it) → self::C1 /* = core::int */ {
+  lowered final self::C1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C1|_#new#tearOff(core::int it) → self::C1
+static inline-class-member method C1|_#new#tearOff(core::int it) → self::C1 /* = core::int */
   return self::C1|(it);
-static inline-class-member method C1|methodC1(lowered final self::C1 #this) → core::int
+static inline-class-member method C1|methodC1(lowered final self::C1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(42){(core::num) → core::int};
-static inline-class-member method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
+static inline-class-member method C1|get#methodC1(lowered final self::C1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C1|methodC1(#this);
-static inline-class-member method C2|(core::int it) → self::C2 {
-  lowered final self::C2 #this = it;
+static inline-class-member method C2|(core::int it) → self::C2 /* = core::int */ {
+  lowered final self::C2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C2|_#new#tearOff(core::int it) → self::C2
+static inline-class-member method C2|_#new#tearOff(core::int it) → self::C2 /* = core::int */
   return self::C2|(it);
-static inline-class-member method C2|methodC2(lowered final self::C2 #this) → core::int
+static inline-class-member method C2|methodC2(lowered final self::C2 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(87){(core::num) → core::int};
-static inline-class-member method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
+static inline-class-member method C2|get#methodC2(lowered final self::C2 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C2|methodC2(#this);
-static inline-class-member method D1|(core::int it) → self::D1 {
-  lowered final self::D1 #this = it;
+static inline-class-member method D1|(core::int it) → self::D1 /* = core::int */ {
+  lowered final self::D1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D1|_#new#tearOff(core::int it) → self::D1
+static inline-class-member method D1|_#new#tearOff(core::int it) → self::D1 /* = core::int */
   return self::D1|(it);
-static inline-class-member method D1|methodD1(lowered final self::D1 #this) → core::int
+static inline-class-member method D1|methodD1(lowered final self::D1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(123){(core::num) → core::int};
-static inline-class-member method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
+static inline-class-member method D1|get#methodD1(lowered final self::D1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::D1|methodD1(#this);
-static method errors(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method errors(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:46:5: Error: The method 'methodB' isn't defined for the class 'A'.
 Try correcting the name to the name of an existing method, or defining a method named 'methodB'.
   a.methodB(); // Error
@@ -359,81 +359,81 @@ Try correcting the name to the name of an existing method, or defining a method
      ^^^^^^^^" in d1{<unresolved>}.methodC2();
   a = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:71:7: Error: A value of type 'B<String>' can't be assigned to a variable of type 'A'.
   a = b1; // Error
-      ^" in b1 as{TypeError} self::A;
+      ^" in b1 as{TypeError} self::A /* = core::int */;
   a = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:72:7: Error: A value of type 'B<num>' can't be assigned to a variable of type 'A'.
   a = b2; // Error
-      ^" in b2 as{TypeError} self::A;
+      ^" in b2 as{TypeError} self::A /* = core::int */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:74:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<String>'.
   b1 = a; // Error
-       ^" in a as{TypeError} self::B<core::String>;
+       ^" in a as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:75:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'B<String>'.
   b1 = b2; // Error
-       ^" in b2 as{TypeError} self::B<core::String>;
+       ^" in b2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:76:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<String>'.
   b1 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::String>;
+       ^" in c1 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:77:8: Error: A value of type 'C2' can't be assigned to a variable of type 'B<String>'.
   b1 = c2; // Error
-       ^" in c2 as{TypeError} self::B<core::String>;
+       ^" in c2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:78:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<String>'.
   b1 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::String>;
+       ^" in d1 as{TypeError} self::B<core::String> /* = core::String */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:80:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<num>'.
   b2 = a; // Error
-       ^" in a as{TypeError} self::B<core::num>;
+       ^" in a as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:81:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'B<num>'.
   b2 = b1; // Error
-       ^" in b1 as{TypeError} self::B<core::num>;
+       ^" in b1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:82:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<num>'.
   b2 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::num>;
+       ^" in c1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:83:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<num>'.
   b2 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::num>;
+       ^" in d1 as{TypeError} self::B<core::num> /* = core::num */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:85:8: Error: A value of type 'A' can't be assigned to a variable of type 'C1'.
   c1 = a; // Error
-       ^" in a as{TypeError} self::C1;
+       ^" in a as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:86:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C1'.
   c1 = b1; // Error
-       ^" in b1 as{TypeError} self::C1;
+       ^" in b1 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:87:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C1'.
   c1 = b2; // Error
-       ^" in b2 as{TypeError} self::C1;
+       ^" in b2 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:88:8: Error: A value of type 'C2' can't be assigned to a variable of type 'C1'.
   c1 = c2; // Error
-       ^" in c2 as{TypeError} self::C1;
+       ^" in c2 as{TypeError} self::C1 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:90:8: Error: A value of type 'A' can't be assigned to a variable of type 'C2'.
   c2 = a; // Error
-       ^" in a as{TypeError} self::C2;
+       ^" in a as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:91:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C2'.
   c2 = b1; // Error
-       ^" in b1 as{TypeError} self::C2;
+       ^" in b1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:92:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C2'.
   c2 = b2; // Error
-       ^" in b2 as{TypeError} self::C2;
+       ^" in b2 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:93:8: Error: A value of type 'C1' can't be assigned to a variable of type 'C2'.
   c2 = c1; // Error
-       ^" in c1 as{TypeError} self::C2;
+       ^" in c1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:94:8: Error: A value of type 'D1' can't be assigned to a variable of type 'C2'.
   c2 = d1; // Error
-       ^" in d1 as{TypeError} self::C2;
+       ^" in d1 as{TypeError} self::C2 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:96:8: Error: A value of type 'A' can't be assigned to a variable of type 'D1'.
   d1 = a; // Error
-       ^" in a as{TypeError} self::D1;
+       ^" in a as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:97:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'D1'.
   d1 = b1; // Error
-       ^" in b1 as{TypeError} self::D1;
+       ^" in b1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:98:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'D1'.
   d1 = b2; // Error
-       ^" in b2 as{TypeError} self::D1;
+       ^" in b2 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:99:8: Error: A value of type 'C1' can't be assigned to a variable of type 'D1'.
   d1 = c1; // Error
-       ^" in c1 as{TypeError} self::D1;
+       ^" in c1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:100:8: Error: A value of type 'C2' can't be assigned to a variable of type 'D1'.
   d1 = c2; // Error
-       ^" in c2 as{TypeError} self::D1;
+       ^" in c2 as{TypeError} self::D1 /* = core::int */;
 }
-static method method(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method method(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   self::expect(0.{core::num::+}(5){(core::num) → core::int}, self::A|methodA(a));
   self::expect("0", self::B|methodB<core::String>(b1));
   self::expect(1.{core::num::+}(0){(core::num) → core::int}, self::B|methodB<core::num>(b2));
diff --git a/pkg/front_end/testcases/inline_class/implements.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/implements.dart.strong.transformed.expect
index f0dd5bbf4ec..9220e9b3f08 100644
--- a/pkg/front_end/testcases/inline_class/implements.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/implements.dart.strong.transformed.expect
@@ -212,75 +212,75 @@ extension type B<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::B|;
   tearoff • = self::B|_#new#tearOff;
 }
-extension type C1(core::int it) implements self::A {
+extension type C1(core::int it) implements self::A /* = core::int */ {
   method methodC1 = self::C1|methodC1;
   tearoff methodC1 = self::C1|get#methodC1;
   constructor • = self::C1|;
   tearoff • = self::C1|_#new#tearOff;
 }
-extension type C2(core::int it) implements self::A, self::B<core::int> {
+extension type C2(core::int it) implements self::A /* = core::int */, self::B<core::int> /* = core::int */ {
   method methodC2 = self::C2|methodC2;
   tearoff methodC2 = self::C2|get#methodC2;
   constructor • = self::C2|;
   tearoff • = self::C2|_#new#tearOff;
 }
-extension type D1(core::int it) implements self::C1 {
+extension type D1(core::int it) implements self::C1 /* = core::int */ {
   method methodD1 = self::D1|methodD1;
   tearoff methodD1 = self::D1|get#methodD1;
   constructor • = self::D1|;
   tearoff • = self::D1|_#new#tearOff;
 }
-static inline-class-member method A|(core::int it) → self::A {
-  lowered final self::A #this = it;
+static inline-class-member method A|(core::int it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(core::int it) → self::A
+static inline-class-member method A|_#new#tearOff(core::int it) → self::A /* = core::int */
   return self::A|(it);
-static inline-class-member method A|methodA(lowered final self::A #this) → core::int
+static inline-class-member method A|methodA(lowered final self::A /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(5){(core::num) → core::int};
-static inline-class-member method A|get#methodA(lowered final self::A #this) → () → core::int
+static inline-class-member method A|get#methodA(lowered final self::A /* = core::int */ #this) → () → core::int
   return () → core::int => self::A|methodA(#this);
-static inline-class-member method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> /* = self::B|::T% */ {
+  lowered final self::B<self::B|::T%> /* = self::B|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%> /* = self::B|_#new#tearOff::T% */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
+static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> /* = self::B|methodB::T% */ #this) → self::B|methodB::T%
   return #this as{Unchecked} self::B|methodB::T%;
-static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
+static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> /* = self::B|get#methodB::T% */ #this) → () → self::B|get#methodB::T%
   return () → self::B|get#methodB::T% => self::B|methodB<self::B|get#methodB::T%>(#this);
-static inline-class-member method C1|(core::int it) → self::C1 {
-  lowered final self::C1 #this = it;
+static inline-class-member method C1|(core::int it) → self::C1 /* = core::int */ {
+  lowered final self::C1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C1|_#new#tearOff(core::int it) → self::C1
+static inline-class-member method C1|_#new#tearOff(core::int it) → self::C1 /* = core::int */
   return self::C1|(it);
-static inline-class-member method C1|methodC1(lowered final self::C1 #this) → core::int
+static inline-class-member method C1|methodC1(lowered final self::C1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(42){(core::num) → core::int};
-static inline-class-member method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
+static inline-class-member method C1|get#methodC1(lowered final self::C1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C1|methodC1(#this);
-static inline-class-member method C2|(core::int it) → self::C2 {
-  lowered final self::C2 #this = it;
+static inline-class-member method C2|(core::int it) → self::C2 /* = core::int */ {
+  lowered final self::C2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C2|_#new#tearOff(core::int it) → self::C2
+static inline-class-member method C2|_#new#tearOff(core::int it) → self::C2 /* = core::int */
   return self::C2|(it);
-static inline-class-member method C2|methodC2(lowered final self::C2 #this) → core::int
+static inline-class-member method C2|methodC2(lowered final self::C2 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(87){(core::num) → core::int};
-static inline-class-member method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
+static inline-class-member method C2|get#methodC2(lowered final self::C2 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C2|methodC2(#this);
-static inline-class-member method D1|(core::int it) → self::D1 {
-  lowered final self::D1 #this = it;
+static inline-class-member method D1|(core::int it) → self::D1 /* = core::int */ {
+  lowered final self::D1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D1|_#new#tearOff(core::int it) → self::D1
+static inline-class-member method D1|_#new#tearOff(core::int it) → self::D1 /* = core::int */
   return self::D1|(it);
-static inline-class-member method D1|methodD1(lowered final self::D1 #this) → core::int
+static inline-class-member method D1|methodD1(lowered final self::D1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(123){(core::num) → core::int};
-static inline-class-member method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
+static inline-class-member method D1|get#methodD1(lowered final self::D1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::D1|methodD1(#this);
-static method errors(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method errors(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:46:5: Error: The method 'methodB' isn't defined for the class 'A'.
 Try correcting the name to the name of an existing method, or defining a method named 'methodB'.
   a.methodB(); // Error
@@ -359,81 +359,81 @@ Try correcting the name to the name of an existing method, or defining a method
      ^^^^^^^^" in d1{<unresolved>}.methodC2();
   a = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:71:7: Error: A value of type 'B<String>' can't be assigned to a variable of type 'A'.
   a = b1; // Error
-      ^" in b1 as{TypeError} self::A;
+      ^" in b1 as{TypeError} self::A /* = core::int */;
   a = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:72:7: Error: A value of type 'B<num>' can't be assigned to a variable of type 'A'.
   a = b2; // Error
-      ^" in b2 as{TypeError} self::A;
+      ^" in b2 as{TypeError} self::A /* = core::int */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:74:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<String>'.
   b1 = a; // Error
-       ^" in a as{TypeError} self::B<core::String>;
+       ^" in a as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:75:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'B<String>'.
   b1 = b2; // Error
-       ^" in b2 as{TypeError} self::B<core::String>;
+       ^" in b2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:76:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<String>'.
   b1 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::String>;
+       ^" in c1 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:77:8: Error: A value of type 'C2' can't be assigned to a variable of type 'B<String>'.
   b1 = c2; // Error
-       ^" in c2 as{TypeError} self::B<core::String>;
+       ^" in c2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:78:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<String>'.
   b1 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::String>;
+       ^" in d1 as{TypeError} self::B<core::String> /* = core::String */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:80:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<num>'.
   b2 = a; // Error
-       ^" in a as{TypeError} self::B<core::num>;
+       ^" in a as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:81:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'B<num>'.
   b2 = b1; // Error
-       ^" in b1 as{TypeError} self::B<core::num>;
+       ^" in b1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:82:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<num>'.
   b2 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::num>;
+       ^" in c1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:83:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<num>'.
   b2 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::num>;
+       ^" in d1 as{TypeError} self::B<core::num> /* = core::num */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:85:8: Error: A value of type 'A' can't be assigned to a variable of type 'C1'.
   c1 = a; // Error
-       ^" in a as{TypeError} self::C1;
+       ^" in a as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:86:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C1'.
   c1 = b1; // Error
-       ^" in b1 as{TypeError} self::C1;
+       ^" in b1 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:87:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C1'.
   c1 = b2; // Error
-       ^" in b2 as{TypeError} self::C1;
+       ^" in b2 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:88:8: Error: A value of type 'C2' can't be assigned to a variable of type 'C1'.
   c1 = c2; // Error
-       ^" in c2 as{TypeError} self::C1;
+       ^" in c2 as{TypeError} self::C1 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:90:8: Error: A value of type 'A' can't be assigned to a variable of type 'C2'.
   c2 = a; // Error
-       ^" in a as{TypeError} self::C2;
+       ^" in a as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:91:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C2'.
   c2 = b1; // Error
-       ^" in b1 as{TypeError} self::C2;
+       ^" in b1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:92:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C2'.
   c2 = b2; // Error
-       ^" in b2 as{TypeError} self::C2;
+       ^" in b2 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:93:8: Error: A value of type 'C1' can't be assigned to a variable of type 'C2'.
   c2 = c1; // Error
-       ^" in c1 as{TypeError} self::C2;
+       ^" in c1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:94:8: Error: A value of type 'D1' can't be assigned to a variable of type 'C2'.
   c2 = d1; // Error
-       ^" in d1 as{TypeError} self::C2;
+       ^" in d1 as{TypeError} self::C2 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:96:8: Error: A value of type 'A' can't be assigned to a variable of type 'D1'.
   d1 = a; // Error
-       ^" in a as{TypeError} self::D1;
+       ^" in a as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:97:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'D1'.
   d1 = b1; // Error
-       ^" in b1 as{TypeError} self::D1;
+       ^" in b1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:98:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'D1'.
   d1 = b2; // Error
-       ^" in b2 as{TypeError} self::D1;
+       ^" in b2 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:99:8: Error: A value of type 'C1' can't be assigned to a variable of type 'D1'.
   d1 = c1; // Error
-       ^" in c1 as{TypeError} self::D1;
+       ^" in c1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:100:8: Error: A value of type 'C2' can't be assigned to a variable of type 'D1'.
   d1 = c2; // Error
-       ^" in c2 as{TypeError} self::D1;
+       ^" in c2 as{TypeError} self::D1 /* = core::int */;
 }
-static method method(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method method(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   self::expect(0.{core::num::+}(5){(core::num) → core::int}, self::A|methodA(a));
   self::expect("0", self::B|methodB<core::String>(b1));
   self::expect(1.{core::num::+}(0){(core::num) → core::int}, self::B|methodB<core::num>(b2));
diff --git a/pkg/front_end/testcases/inline_class/implements.dart.weak.expect b/pkg/front_end/testcases/inline_class/implements.dart.weak.expect
index 4fad823f754..1b7e2ff088c 100644
--- a/pkg/front_end/testcases/inline_class/implements.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/implements.dart.weak.expect
@@ -212,75 +212,75 @@ extension type B<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::B|;
   tearoff • = self::B|_#new#tearOff;
 }
-extension type C1(core::int it) implements self::A {
+extension type C1(core::int it) implements self::A /* = core::int */ {
   method methodC1 = self::C1|methodC1;
   tearoff methodC1 = self::C1|get#methodC1;
   constructor • = self::C1|;
   tearoff • = self::C1|_#new#tearOff;
 }
-extension type C2(core::int it) implements self::A, self::B<core::int> {
+extension type C2(core::int it) implements self::A /* = core::int */, self::B<core::int> /* = core::int */ {
   method methodC2 = self::C2|methodC2;
   tearoff methodC2 = self::C2|get#methodC2;
   constructor • = self::C2|;
   tearoff • = self::C2|_#new#tearOff;
 }
-extension type D1(core::int it) implements self::C1 {
+extension type D1(core::int it) implements self::C1 /* = core::int */ {
   method methodD1 = self::D1|methodD1;
   tearoff methodD1 = self::D1|get#methodD1;
   constructor • = self::D1|;
   tearoff • = self::D1|_#new#tearOff;
 }
-static inline-class-member method A|(core::int it) → self::A {
-  lowered final self::A #this = it;
+static inline-class-member method A|(core::int it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(core::int it) → self::A
+static inline-class-member method A|_#new#tearOff(core::int it) → self::A /* = core::int */
   return self::A|(it);
-static inline-class-member method A|methodA(lowered final self::A #this) → core::int
+static inline-class-member method A|methodA(lowered final self::A /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(5){(core::num) → core::int};
-static inline-class-member method A|get#methodA(lowered final self::A #this) → () → core::int
+static inline-class-member method A|get#methodA(lowered final self::A /* = core::int */ #this) → () → core::int
   return () → core::int => self::A|methodA(#this);
-static inline-class-member method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> /* = self::B|::T% */ {
+  lowered final self::B<self::B|::T%> /* = self::B|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%> /* = self::B|_#new#tearOff::T% */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
+static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> /* = self::B|methodB::T% */ #this) → self::B|methodB::T%
   return #this as{Unchecked} self::B|methodB::T%;
-static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
+static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> /* = self::B|get#methodB::T% */ #this) → () → self::B|get#methodB::T%
   return () → self::B|get#methodB::T% => self::B|methodB<self::B|get#methodB::T%>(#this);
-static inline-class-member method C1|(core::int it) → self::C1 {
-  lowered final self::C1 #this = it;
+static inline-class-member method C1|(core::int it) → self::C1 /* = core::int */ {
+  lowered final self::C1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C1|_#new#tearOff(core::int it) → self::C1
+static inline-class-member method C1|_#new#tearOff(core::int it) → self::C1 /* = core::int */
   return self::C1|(it);
-static inline-class-member method C1|methodC1(lowered final self::C1 #this) → core::int
+static inline-class-member method C1|methodC1(lowered final self::C1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(42){(core::num) → core::int};
-static inline-class-member method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
+static inline-class-member method C1|get#methodC1(lowered final self::C1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C1|methodC1(#this);
-static inline-class-member method C2|(core::int it) → self::C2 {
-  lowered final self::C2 #this = it;
+static inline-class-member method C2|(core::int it) → self::C2 /* = core::int */ {
+  lowered final self::C2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C2|_#new#tearOff(core::int it) → self::C2
+static inline-class-member method C2|_#new#tearOff(core::int it) → self::C2 /* = core::int */
   return self::C2|(it);
-static inline-class-member method C2|methodC2(lowered final self::C2 #this) → core::int
+static inline-class-member method C2|methodC2(lowered final self::C2 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(87){(core::num) → core::int};
-static inline-class-member method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
+static inline-class-member method C2|get#methodC2(lowered final self::C2 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C2|methodC2(#this);
-static inline-class-member method D1|(core::int it) → self::D1 {
-  lowered final self::D1 #this = it;
+static inline-class-member method D1|(core::int it) → self::D1 /* = core::int */ {
+  lowered final self::D1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D1|_#new#tearOff(core::int it) → self::D1
+static inline-class-member method D1|_#new#tearOff(core::int it) → self::D1 /* = core::int */
   return self::D1|(it);
-static inline-class-member method D1|methodD1(lowered final self::D1 #this) → core::int
+static inline-class-member method D1|methodD1(lowered final self::D1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(123){(core::num) → core::int};
-static inline-class-member method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
+static inline-class-member method D1|get#methodD1(lowered final self::D1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::D1|methodD1(#this);
-static method errors(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method errors(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:46:5: Error: The method 'methodB' isn't defined for the class 'A'.
 Try correcting the name to the name of an existing method, or defining a method named 'methodB'.
   a.methodB(); // Error
@@ -359,81 +359,81 @@ Try correcting the name to the name of an existing method, or defining a method
      ^^^^^^^^" in d1{<unresolved>}.methodC2();
   a = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:71:7: Error: A value of type 'B<String>' can't be assigned to a variable of type 'A'.
   a = b1; // Error
-      ^" in b1 as{TypeError} self::A;
+      ^" in b1 as{TypeError} self::A /* = core::int */;
   a = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:72:7: Error: A value of type 'B<num>' can't be assigned to a variable of type 'A'.
   a = b2; // Error
-      ^" in b2 as{TypeError} self::A;
+      ^" in b2 as{TypeError} self::A /* = core::int */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:74:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<String>'.
   b1 = a; // Error
-       ^" in a as{TypeError} self::B<core::String>;
+       ^" in a as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:75:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'B<String>'.
   b1 = b2; // Error
-       ^" in b2 as{TypeError} self::B<core::String>;
+       ^" in b2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:76:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<String>'.
   b1 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::String>;
+       ^" in c1 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:77:8: Error: A value of type 'C2' can't be assigned to a variable of type 'B<String>'.
   b1 = c2; // Error
-       ^" in c2 as{TypeError} self::B<core::String>;
+       ^" in c2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:78:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<String>'.
   b1 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::String>;
+       ^" in d1 as{TypeError} self::B<core::String> /* = core::String */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:80:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<num>'.
   b2 = a; // Error
-       ^" in a as{TypeError} self::B<core::num>;
+       ^" in a as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:81:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'B<num>'.
   b2 = b1; // Error
-       ^" in b1 as{TypeError} self::B<core::num>;
+       ^" in b1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:82:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<num>'.
   b2 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::num>;
+       ^" in c1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:83:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<num>'.
   b2 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::num>;
+       ^" in d1 as{TypeError} self::B<core::num> /* = core::num */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:85:8: Error: A value of type 'A' can't be assigned to a variable of type 'C1'.
   c1 = a; // Error
-       ^" in a as{TypeError} self::C1;
+       ^" in a as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:86:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C1'.
   c1 = b1; // Error
-       ^" in b1 as{TypeError} self::C1;
+       ^" in b1 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:87:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C1'.
   c1 = b2; // Error
-       ^" in b2 as{TypeError} self::C1;
+       ^" in b2 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:88:8: Error: A value of type 'C2' can't be assigned to a variable of type 'C1'.
   c1 = c2; // Error
-       ^" in c2 as{TypeError} self::C1;
+       ^" in c2 as{TypeError} self::C1 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:90:8: Error: A value of type 'A' can't be assigned to a variable of type 'C2'.
   c2 = a; // Error
-       ^" in a as{TypeError} self::C2;
+       ^" in a as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:91:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C2'.
   c2 = b1; // Error
-       ^" in b1 as{TypeError} self::C2;
+       ^" in b1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:92:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C2'.
   c2 = b2; // Error
-       ^" in b2 as{TypeError} self::C2;
+       ^" in b2 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:93:8: Error: A value of type 'C1' can't be assigned to a variable of type 'C2'.
   c2 = c1; // Error
-       ^" in c1 as{TypeError} self::C2;
+       ^" in c1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:94:8: Error: A value of type 'D1' can't be assigned to a variable of type 'C2'.
   c2 = d1; // Error
-       ^" in d1 as{TypeError} self::C2;
+       ^" in d1 as{TypeError} self::C2 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:96:8: Error: A value of type 'A' can't be assigned to a variable of type 'D1'.
   d1 = a; // Error
-       ^" in a as{TypeError} self::D1;
+       ^" in a as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:97:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'D1'.
   d1 = b1; // Error
-       ^" in b1 as{TypeError} self::D1;
+       ^" in b1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:98:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'D1'.
   d1 = b2; // Error
-       ^" in b2 as{TypeError} self::D1;
+       ^" in b2 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:99:8: Error: A value of type 'C1' can't be assigned to a variable of type 'D1'.
   d1 = c1; // Error
-       ^" in c1 as{TypeError} self::D1;
+       ^" in c1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:100:8: Error: A value of type 'C2' can't be assigned to a variable of type 'D1'.
   d1 = c2; // Error
-       ^" in c2 as{TypeError} self::D1;
+       ^" in c2 as{TypeError} self::D1 /* = core::int */;
 }
-static method method(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method method(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   self::expect(0.{core::num::+}(5){(core::num) → core::int}, self::A|methodA(a));
   self::expect("0", self::B|methodB<core::String>(b1));
   self::expect(1.{core::num::+}(0){(core::num) → core::int}, self::B|methodB<core::num>(b2));
diff --git a/pkg/front_end/testcases/inline_class/implements.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/implements.dart.weak.modular.expect
index 4fad823f754..1b7e2ff088c 100644
--- a/pkg/front_end/testcases/inline_class/implements.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/implements.dart.weak.modular.expect
@@ -212,75 +212,75 @@ extension type B<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::B|;
   tearoff • = self::B|_#new#tearOff;
 }
-extension type C1(core::int it) implements self::A {
+extension type C1(core::int it) implements self::A /* = core::int */ {
   method methodC1 = self::C1|methodC1;
   tearoff methodC1 = self::C1|get#methodC1;
   constructor • = self::C1|;
   tearoff • = self::C1|_#new#tearOff;
 }
-extension type C2(core::int it) implements self::A, self::B<core::int> {
+extension type C2(core::int it) implements self::A /* = core::int */, self::B<core::int> /* = core::int */ {
   method methodC2 = self::C2|methodC2;
   tearoff methodC2 = self::C2|get#methodC2;
   constructor • = self::C2|;
   tearoff • = self::C2|_#new#tearOff;
 }
-extension type D1(core::int it) implements self::C1 {
+extension type D1(core::int it) implements self::C1 /* = core::int */ {
   method methodD1 = self::D1|methodD1;
   tearoff methodD1 = self::D1|get#methodD1;
   constructor • = self::D1|;
   tearoff • = self::D1|_#new#tearOff;
 }
-static inline-class-member method A|(core::int it) → self::A {
-  lowered final self::A #this = it;
+static inline-class-member method A|(core::int it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(core::int it) → self::A
+static inline-class-member method A|_#new#tearOff(core::int it) → self::A /* = core::int */
   return self::A|(it);
-static inline-class-member method A|methodA(lowered final self::A #this) → core::int
+static inline-class-member method A|methodA(lowered final self::A /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(5){(core::num) → core::int};
-static inline-class-member method A|get#methodA(lowered final self::A #this) → () → core::int
+static inline-class-member method A|get#methodA(lowered final self::A /* = core::int */ #this) → () → core::int
   return () → core::int => self::A|methodA(#this);
-static inline-class-member method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> /* = self::B|::T% */ {
+  lowered final self::B<self::B|::T%> /* = self::B|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%> /* = self::B|_#new#tearOff::T% */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
+static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> /* = self::B|methodB::T% */ #this) → self::B|methodB::T%
   return #this as{Unchecked} self::B|methodB::T%;
-static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
+static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> /* = self::B|get#methodB::T% */ #this) → () → self::B|get#methodB::T%
   return () → self::B|get#methodB::T% => self::B|methodB<self::B|get#methodB::T%>(#this);
-static inline-class-member method C1|(core::int it) → self::C1 {
-  lowered final self::C1 #this = it;
+static inline-class-member method C1|(core::int it) → self::C1 /* = core::int */ {
+  lowered final self::C1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C1|_#new#tearOff(core::int it) → self::C1
+static inline-class-member method C1|_#new#tearOff(core::int it) → self::C1 /* = core::int */
   return self::C1|(it);
-static inline-class-member method C1|methodC1(lowered final self::C1 #this) → core::int
+static inline-class-member method C1|methodC1(lowered final self::C1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(42){(core::num) → core::int};
-static inline-class-member method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
+static inline-class-member method C1|get#methodC1(lowered final self::C1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C1|methodC1(#this);
-static inline-class-member method C2|(core::int it) → self::C2 {
-  lowered final self::C2 #this = it;
+static inline-class-member method C2|(core::int it) → self::C2 /* = core::int */ {
+  lowered final self::C2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C2|_#new#tearOff(core::int it) → self::C2
+static inline-class-member method C2|_#new#tearOff(core::int it) → self::C2 /* = core::int */
   return self::C2|(it);
-static inline-class-member method C2|methodC2(lowered final self::C2 #this) → core::int
+static inline-class-member method C2|methodC2(lowered final self::C2 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(87){(core::num) → core::int};
-static inline-class-member method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
+static inline-class-member method C2|get#methodC2(lowered final self::C2 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C2|methodC2(#this);
-static inline-class-member method D1|(core::int it) → self::D1 {
-  lowered final self::D1 #this = it;
+static inline-class-member method D1|(core::int it) → self::D1 /* = core::int */ {
+  lowered final self::D1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D1|_#new#tearOff(core::int it) → self::D1
+static inline-class-member method D1|_#new#tearOff(core::int it) → self::D1 /* = core::int */
   return self::D1|(it);
-static inline-class-member method D1|methodD1(lowered final self::D1 #this) → core::int
+static inline-class-member method D1|methodD1(lowered final self::D1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(123){(core::num) → core::int};
-static inline-class-member method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
+static inline-class-member method D1|get#methodD1(lowered final self::D1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::D1|methodD1(#this);
-static method errors(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method errors(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:46:5: Error: The method 'methodB' isn't defined for the class 'A'.
 Try correcting the name to the name of an existing method, or defining a method named 'methodB'.
   a.methodB(); // Error
@@ -359,81 +359,81 @@ Try correcting the name to the name of an existing method, or defining a method
      ^^^^^^^^" in d1{<unresolved>}.methodC2();
   a = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:71:7: Error: A value of type 'B<String>' can't be assigned to a variable of type 'A'.
   a = b1; // Error
-      ^" in b1 as{TypeError} self::A;
+      ^" in b1 as{TypeError} self::A /* = core::int */;
   a = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:72:7: Error: A value of type 'B<num>' can't be assigned to a variable of type 'A'.
   a = b2; // Error
-      ^" in b2 as{TypeError} self::A;
+      ^" in b2 as{TypeError} self::A /* = core::int */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:74:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<String>'.
   b1 = a; // Error
-       ^" in a as{TypeError} self::B<core::String>;
+       ^" in a as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:75:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'B<String>'.
   b1 = b2; // Error
-       ^" in b2 as{TypeError} self::B<core::String>;
+       ^" in b2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:76:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<String>'.
   b1 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::String>;
+       ^" in c1 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:77:8: Error: A value of type 'C2' can't be assigned to a variable of type 'B<String>'.
   b1 = c2; // Error
-       ^" in c2 as{TypeError} self::B<core::String>;
+       ^" in c2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:78:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<String>'.
   b1 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::String>;
+       ^" in d1 as{TypeError} self::B<core::String> /* = core::String */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:80:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<num>'.
   b2 = a; // Error
-       ^" in a as{TypeError} self::B<core::num>;
+       ^" in a as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:81:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'B<num>'.
   b2 = b1; // Error
-       ^" in b1 as{TypeError} self::B<core::num>;
+       ^" in b1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:82:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<num>'.
   b2 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::num>;
+       ^" in c1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:83:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<num>'.
   b2 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::num>;
+       ^" in d1 as{TypeError} self::B<core::num> /* = core::num */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:85:8: Error: A value of type 'A' can't be assigned to a variable of type 'C1'.
   c1 = a; // Error
-       ^" in a as{TypeError} self::C1;
+       ^" in a as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:86:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C1'.
   c1 = b1; // Error
-       ^" in b1 as{TypeError} self::C1;
+       ^" in b1 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:87:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C1'.
   c1 = b2; // Error
-       ^" in b2 as{TypeError} self::C1;
+       ^" in b2 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:88:8: Error: A value of type 'C2' can't be assigned to a variable of type 'C1'.
   c1 = c2; // Error
-       ^" in c2 as{TypeError} self::C1;
+       ^" in c2 as{TypeError} self::C1 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:90:8: Error: A value of type 'A' can't be assigned to a variable of type 'C2'.
   c2 = a; // Error
-       ^" in a as{TypeError} self::C2;
+       ^" in a as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:91:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C2'.
   c2 = b1; // Error
-       ^" in b1 as{TypeError} self::C2;
+       ^" in b1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:92:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C2'.
   c2 = b2; // Error
-       ^" in b2 as{TypeError} self::C2;
+       ^" in b2 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:93:8: Error: A value of type 'C1' can't be assigned to a variable of type 'C2'.
   c2 = c1; // Error
-       ^" in c1 as{TypeError} self::C2;
+       ^" in c1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:94:8: Error: A value of type 'D1' can't be assigned to a variable of type 'C2'.
   c2 = d1; // Error
-       ^" in d1 as{TypeError} self::C2;
+       ^" in d1 as{TypeError} self::C2 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:96:8: Error: A value of type 'A' can't be assigned to a variable of type 'D1'.
   d1 = a; // Error
-       ^" in a as{TypeError} self::D1;
+       ^" in a as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:97:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'D1'.
   d1 = b1; // Error
-       ^" in b1 as{TypeError} self::D1;
+       ^" in b1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:98:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'D1'.
   d1 = b2; // Error
-       ^" in b2 as{TypeError} self::D1;
+       ^" in b2 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:99:8: Error: A value of type 'C1' can't be assigned to a variable of type 'D1'.
   d1 = c1; // Error
-       ^" in c1 as{TypeError} self::D1;
+       ^" in c1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:100:8: Error: A value of type 'C2' can't be assigned to a variable of type 'D1'.
   d1 = c2; // Error
-       ^" in c2 as{TypeError} self::D1;
+       ^" in c2 as{TypeError} self::D1 /* = core::int */;
 }
-static method method(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method method(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   self::expect(0.{core::num::+}(5){(core::num) → core::int}, self::A|methodA(a));
   self::expect("0", self::B|methodB<core::String>(b1));
   self::expect(1.{core::num::+}(0){(core::num) → core::int}, self::B|methodB<core::num>(b2));
diff --git a/pkg/front_end/testcases/inline_class/implements.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/implements.dart.weak.outline.expect
index 2032ef091d8..521318d5ace 100644
--- a/pkg/front_end/testcases/inline_class/implements.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/implements.dart.weak.outline.expect
@@ -14,67 +14,67 @@ extension type B<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::B|;
   tearoff • = self::B|_#new#tearOff;
 }
-extension type C1(core::int it) implements self::A {
+extension type C1(core::int it) implements self::A /* = core::int */ {
   method methodC1 = self::C1|methodC1;
   tearoff methodC1 = self::C1|get#methodC1;
   constructor • = self::C1|;
   tearoff • = self::C1|_#new#tearOff;
 }
-extension type C2(core::int it) implements self::A, self::B<core::int> {
+extension type C2(core::int it) implements self::A /* = core::int */, self::B<core::int> /* = core::int */ {
   method methodC2 = self::C2|methodC2;
   tearoff methodC2 = self::C2|get#methodC2;
   constructor • = self::C2|;
   tearoff • = self::C2|_#new#tearOff;
 }
-extension type D1(core::int it) implements self::C1 {
+extension type D1(core::int it) implements self::C1 /* = core::int */ {
   method methodD1 = self::D1|methodD1;
   tearoff methodD1 = self::D1|get#methodD1;
   constructor • = self::D1|;
   tearoff • = self::D1|_#new#tearOff;
 }
-static inline-class-member method A|(core::int it) → self::A
+static inline-class-member method A|(core::int it) → self::A /* = core::int */
   ;
-static inline-class-member method A|_#new#tearOff(core::int it) → self::A
+static inline-class-member method A|_#new#tearOff(core::int it) → self::A /* = core::int */
   return self::A|(it);
-static inline-class-member method A|methodA(lowered final self::A #this) → core::int
+static inline-class-member method A|methodA(lowered final self::A /* = core::int */ #this) → core::int
   ;
-static inline-class-member method A|get#methodA(lowered final self::A #this) → () → core::int
+static inline-class-member method A|get#methodA(lowered final self::A /* = core::int */ #this) → () → core::int
   return () → core::int => self::A|methodA(#this);
-static inline-class-member method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%>
+static inline-class-member method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> /* = self::B|::T% */
   ;
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%> /* = self::B|_#new#tearOff::T% */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
+static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> /* = self::B|methodB::T% */ #this) → self::B|methodB::T%
   ;
-static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
+static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> /* = self::B|get#methodB::T% */ #this) → () → self::B|get#methodB::T%
   return () → self::B|get#methodB::T% => self::B|methodB<self::B|get#methodB::T%>(#this);
-static inline-class-member method C1|(core::int it) → self::C1
+static inline-class-member method C1|(core::int it) → self::C1 /* = core::int */
   ;
-static inline-class-member method C1|_#new#tearOff(core::int it) → self::C1
+static inline-class-member method C1|_#new#tearOff(core::int it) → self::C1 /* = core::int */
   return self::C1|(it);
-static inline-class-member method C1|methodC1(lowered final self::C1 #this) → core::int
+static inline-class-member method C1|methodC1(lowered final self::C1 /* = core::int */ #this) → core::int
   ;
-static inline-class-member method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
+static inline-class-member method C1|get#methodC1(lowered final self::C1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C1|methodC1(#this);
-static inline-class-member method C2|(core::int it) → self::C2
+static inline-class-member method C2|(core::int it) → self::C2 /* = core::int */
   ;
-static inline-class-member method C2|_#new#tearOff(core::int it) → self::C2
+static inline-class-member method C2|_#new#tearOff(core::int it) → self::C2 /* = core::int */
   return self::C2|(it);
-static inline-class-member method C2|methodC2(lowered final self::C2 #this) → core::int
+static inline-class-member method C2|methodC2(lowered final self::C2 /* = core::int */ #this) → core::int
   ;
-static inline-class-member method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
+static inline-class-member method C2|get#methodC2(lowered final self::C2 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C2|methodC2(#this);
-static inline-class-member method D1|(core::int it) → self::D1
+static inline-class-member method D1|(core::int it) → self::D1 /* = core::int */
   ;
-static inline-class-member method D1|_#new#tearOff(core::int it) → self::D1
+static inline-class-member method D1|_#new#tearOff(core::int it) → self::D1 /* = core::int */
   return self::D1|(it);
-static inline-class-member method D1|methodD1(lowered final self::D1 #this) → core::int
+static inline-class-member method D1|methodD1(lowered final self::D1 /* = core::int */ #this) → core::int
   ;
-static inline-class-member method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
+static inline-class-member method D1|get#methodD1(lowered final self::D1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::D1|methodD1(#this);
-static method errors(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic
+static method errors(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic
   ;
-static method method(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic
+static method method(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/implements.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/implements.dart.weak.transformed.expect
index f0dd5bbf4ec..9220e9b3f08 100644
--- a/pkg/front_end/testcases/inline_class/implements.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/implements.dart.weak.transformed.expect
@@ -212,75 +212,75 @@ extension type B<T extends core::Object? = dynamic>(T% it) {
   constructor • = self::B|;
   tearoff • = self::B|_#new#tearOff;
 }
-extension type C1(core::int it) implements self::A {
+extension type C1(core::int it) implements self::A /* = core::int */ {
   method methodC1 = self::C1|methodC1;
   tearoff methodC1 = self::C1|get#methodC1;
   constructor • = self::C1|;
   tearoff • = self::C1|_#new#tearOff;
 }
-extension type C2(core::int it) implements self::A, self::B<core::int> {
+extension type C2(core::int it) implements self::A /* = core::int */, self::B<core::int> /* = core::int */ {
   method methodC2 = self::C2|methodC2;
   tearoff methodC2 = self::C2|get#methodC2;
   constructor • = self::C2|;
   tearoff • = self::C2|_#new#tearOff;
 }
-extension type D1(core::int it) implements self::C1 {
+extension type D1(core::int it) implements self::C1 /* = core::int */ {
   method methodD1 = self::D1|methodD1;
   tearoff methodD1 = self::D1|get#methodD1;
   constructor • = self::D1|;
   tearoff • = self::D1|_#new#tearOff;
 }
-static inline-class-member method A|(core::int it) → self::A {
-  lowered final self::A #this = it;
+static inline-class-member method A|(core::int it) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method A|_#new#tearOff(core::int it) → self::A
+static inline-class-member method A|_#new#tearOff(core::int it) → self::A /* = core::int */
   return self::A|(it);
-static inline-class-member method A|methodA(lowered final self::A #this) → core::int
+static inline-class-member method A|methodA(lowered final self::A /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(5){(core::num) → core::int};
-static inline-class-member method A|get#methodA(lowered final self::A #this) → () → core::int
+static inline-class-member method A|get#methodA(lowered final self::A /* = core::int */ #this) → () → core::int
   return () → core::int => self::A|methodA(#this);
-static inline-class-member method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> {
-  lowered final self::B<self::B|::T%> #this = it;
+static inline-class-member method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> /* = self::B|::T% */ {
+  lowered final self::B<self::B|::T%> /* = self::B|::T% */ #this = it;
   return #this;
 }
-static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%> /* = self::B|_#new#tearOff::T% */
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
+static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> /* = self::B|methodB::T% */ #this) → self::B|methodB::T%
   return #this as{Unchecked} self::B|methodB::T%;
-static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
+static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> /* = self::B|get#methodB::T% */ #this) → () → self::B|get#methodB::T%
   return () → self::B|get#methodB::T% => self::B|methodB<self::B|get#methodB::T%>(#this);
-static inline-class-member method C1|(core::int it) → self::C1 {
-  lowered final self::C1 #this = it;
+static inline-class-member method C1|(core::int it) → self::C1 /* = core::int */ {
+  lowered final self::C1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C1|_#new#tearOff(core::int it) → self::C1
+static inline-class-member method C1|_#new#tearOff(core::int it) → self::C1 /* = core::int */
   return self::C1|(it);
-static inline-class-member method C1|methodC1(lowered final self::C1 #this) → core::int
+static inline-class-member method C1|methodC1(lowered final self::C1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(42){(core::num) → core::int};
-static inline-class-member method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
+static inline-class-member method C1|get#methodC1(lowered final self::C1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C1|methodC1(#this);
-static inline-class-member method C2|(core::int it) → self::C2 {
-  lowered final self::C2 #this = it;
+static inline-class-member method C2|(core::int it) → self::C2 /* = core::int */ {
+  lowered final self::C2 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method C2|_#new#tearOff(core::int it) → self::C2
+static inline-class-member method C2|_#new#tearOff(core::int it) → self::C2 /* = core::int */
   return self::C2|(it);
-static inline-class-member method C2|methodC2(lowered final self::C2 #this) → core::int
+static inline-class-member method C2|methodC2(lowered final self::C2 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(87){(core::num) → core::int};
-static inline-class-member method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
+static inline-class-member method C2|get#methodC2(lowered final self::C2 /* = core::int */ #this) → () → core::int
   return () → core::int => self::C2|methodC2(#this);
-static inline-class-member method D1|(core::int it) → self::D1 {
-  lowered final self::D1 #this = it;
+static inline-class-member method D1|(core::int it) → self::D1 /* = core::int */ {
+  lowered final self::D1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method D1|_#new#tearOff(core::int it) → self::D1
+static inline-class-member method D1|_#new#tearOff(core::int it) → self::D1 /* = core::int */
   return self::D1|(it);
-static inline-class-member method D1|methodD1(lowered final self::D1 #this) → core::int
+static inline-class-member method D1|methodD1(lowered final self::D1 /* = core::int */ #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(123){(core::num) → core::int};
-static inline-class-member method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
+static inline-class-member method D1|get#methodD1(lowered final self::D1 /* = core::int */ #this) → () → core::int
   return () → core::int => self::D1|methodD1(#this);
-static method errors(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method errors(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:46:5: Error: The method 'methodB' isn't defined for the class 'A'.
 Try correcting the name to the name of an existing method, or defining a method named 'methodB'.
   a.methodB(); // Error
@@ -359,81 +359,81 @@ Try correcting the name to the name of an existing method, or defining a method
      ^^^^^^^^" in d1{<unresolved>}.methodC2();
   a = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:71:7: Error: A value of type 'B<String>' can't be assigned to a variable of type 'A'.
   a = b1; // Error
-      ^" in b1 as{TypeError} self::A;
+      ^" in b1 as{TypeError} self::A /* = core::int */;
   a = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:72:7: Error: A value of type 'B<num>' can't be assigned to a variable of type 'A'.
   a = b2; // Error
-      ^" in b2 as{TypeError} self::A;
+      ^" in b2 as{TypeError} self::A /* = core::int */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:74:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<String>'.
   b1 = a; // Error
-       ^" in a as{TypeError} self::B<core::String>;
+       ^" in a as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:75:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'B<String>'.
   b1 = b2; // Error
-       ^" in b2 as{TypeError} self::B<core::String>;
+       ^" in b2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:76:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<String>'.
   b1 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::String>;
+       ^" in c1 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:77:8: Error: A value of type 'C2' can't be assigned to a variable of type 'B<String>'.
   b1 = c2; // Error
-       ^" in c2 as{TypeError} self::B<core::String>;
+       ^" in c2 as{TypeError} self::B<core::String> /* = core::String */;
   b1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:78:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<String>'.
   b1 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::String>;
+       ^" in d1 as{TypeError} self::B<core::String> /* = core::String */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:80:8: Error: A value of type 'A' can't be assigned to a variable of type 'B<num>'.
   b2 = a; // Error
-       ^" in a as{TypeError} self::B<core::num>;
+       ^" in a as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:81:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'B<num>'.
   b2 = b1; // Error
-       ^" in b1 as{TypeError} self::B<core::num>;
+       ^" in b1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:82:8: Error: A value of type 'C1' can't be assigned to a variable of type 'B<num>'.
   b2 = c1; // Error
-       ^" in c1 as{TypeError} self::B<core::num>;
+       ^" in c1 as{TypeError} self::B<core::num> /* = core::num */;
   b2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:83:8: Error: A value of type 'D1' can't be assigned to a variable of type 'B<num>'.
   b2 = d1; // Error
-       ^" in d1 as{TypeError} self::B<core::num>;
+       ^" in d1 as{TypeError} self::B<core::num> /* = core::num */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:85:8: Error: A value of type 'A' can't be assigned to a variable of type 'C1'.
   c1 = a; // Error
-       ^" in a as{TypeError} self::C1;
+       ^" in a as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:86:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C1'.
   c1 = b1; // Error
-       ^" in b1 as{TypeError} self::C1;
+       ^" in b1 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:87:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C1'.
   c1 = b2; // Error
-       ^" in b2 as{TypeError} self::C1;
+       ^" in b2 as{TypeError} self::C1 /* = core::int */;
   c1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:88:8: Error: A value of type 'C2' can't be assigned to a variable of type 'C1'.
   c1 = c2; // Error
-       ^" in c2 as{TypeError} self::C1;
+       ^" in c2 as{TypeError} self::C1 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:90:8: Error: A value of type 'A' can't be assigned to a variable of type 'C2'.
   c2 = a; // Error
-       ^" in a as{TypeError} self::C2;
+       ^" in a as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:91:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'C2'.
   c2 = b1; // Error
-       ^" in b1 as{TypeError} self::C2;
+       ^" in b1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:92:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'C2'.
   c2 = b2; // Error
-       ^" in b2 as{TypeError} self::C2;
+       ^" in b2 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:93:8: Error: A value of type 'C1' can't be assigned to a variable of type 'C2'.
   c2 = c1; // Error
-       ^" in c1 as{TypeError} self::C2;
+       ^" in c1 as{TypeError} self::C2 /* = core::int */;
   c2 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:94:8: Error: A value of type 'D1' can't be assigned to a variable of type 'C2'.
   c2 = d1; // Error
-       ^" in d1 as{TypeError} self::C2;
+       ^" in d1 as{TypeError} self::C2 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:96:8: Error: A value of type 'A' can't be assigned to a variable of type 'D1'.
   d1 = a; // Error
-       ^" in a as{TypeError} self::D1;
+       ^" in a as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:97:8: Error: A value of type 'B<String>' can't be assigned to a variable of type 'D1'.
   d1 = b1; // Error
-       ^" in b1 as{TypeError} self::D1;
+       ^" in b1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:98:8: Error: A value of type 'B<num>' can't be assigned to a variable of type 'D1'.
   d1 = b2; // Error
-       ^" in b2 as{TypeError} self::D1;
+       ^" in b2 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:99:8: Error: A value of type 'C1' can't be assigned to a variable of type 'D1'.
   d1 = c1; // Error
-       ^" in c1 as{TypeError} self::D1;
+       ^" in c1 as{TypeError} self::D1 /* = core::int */;
   d1 = invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:100:8: Error: A value of type 'C2' can't be assigned to a variable of type 'D1'.
   d1 = c2; // Error
-       ^" in c2 as{TypeError} self::D1;
+       ^" in c2 as{TypeError} self::D1 /* = core::int */;
 }
-static method method(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
+static method method(self::A /* = core::int */ a, self::B<core::String> /* = core::String */ b1, self::B<core::num> /* = core::num */ b2, self::C1 /* = core::int */ c1, self::C2 /* = core::int */ c2, self::D1 /* = core::int */ d1) → dynamic {
   self::expect(0.{core::num::+}(5){(core::num) → core::int}, self::A|methodA(a));
   self::expect("0", self::B|methodB<core::String>(b1));
   self::expect(1.{core::num::+}(0){(core::num) → core::int}, self::B|methodB<core::num>(b2));
diff --git a/pkg/front_end/testcases/inline_class/initializers.dart.strong.expect b/pkg/front_end/testcases/inline_class/initializers.dart.strong.expect
index 9400a66fff1..73bd7c8316c 100644
--- a/pkg/front_end/testcases/inline_class/initializers.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/initializers.dart.strong.expect
@@ -44,42 +44,42 @@ extension type Class6(core::int field) {
   constructor • = self::Class6|;
   tearoff • = self::Class6|_#new#tearOff;
 }
-static inline-class-member method Class1|(core::int field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(core::int field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|(core::int field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(core::int field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2 /* = core::int */
   return self::Class2|(field);
-static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
-  lowered final self::Class4 #this = field;
+static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */ {
+  lowered final self::Class4 /* = core::int */ #this = field;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:24:27: Error: 'nonexisting' isn't an instance field of this class.
   Class4(this.field, this.nonexisting);
                           ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */
   return self::Class4|(field, nonexisting);
-static inline-class-member method Class5|(core::int field) → self::Class5 {
-  lowered final self::Class5 #this = field;
+static inline-class-member method Class5|(core::int field) → self::Class5 /* = core::int */ {
+  lowered final self::Class5 /* = core::int */ #this = field;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:30:35: Error: 'field' was already initialized by this constructor.
   Class5(this.field) : this.field = 42;
                                   ^";
   return #this;
 }
-static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5
+static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5 /* = core::int */
   return self::Class5|(field);
-static inline-class-member method Class6|(core::int field) → self::Class6 {
-  lowered final self::Class6 #this = field;
+static inline-class-member method Class6|(core::int field) → self::Class6 /* = core::int */ {
+  lowered final self::Class6 /* = core::int */ #this = field;
   final dynamic #t3 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:36:29: Error: 'nonexisting' isn't an instance field of this class.
   Class6(this.field) : this.nonexisting = 42;
                             ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6
+static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6 /* = core::int */
   return self::Class6|(field);
diff --git a/pkg/front_end/testcases/inline_class/initializers.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/initializers.dart.strong.transformed.expect
index 9400a66fff1..73bd7c8316c 100644
--- a/pkg/front_end/testcases/inline_class/initializers.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/initializers.dart.strong.transformed.expect
@@ -44,42 +44,42 @@ extension type Class6(core::int field) {
   constructor • = self::Class6|;
   tearoff • = self::Class6|_#new#tearOff;
 }
-static inline-class-member method Class1|(core::int field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(core::int field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|(core::int field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(core::int field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2 /* = core::int */
   return self::Class2|(field);
-static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
-  lowered final self::Class4 #this = field;
+static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */ {
+  lowered final self::Class4 /* = core::int */ #this = field;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:24:27: Error: 'nonexisting' isn't an instance field of this class.
   Class4(this.field, this.nonexisting);
                           ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */
   return self::Class4|(field, nonexisting);
-static inline-class-member method Class5|(core::int field) → self::Class5 {
-  lowered final self::Class5 #this = field;
+static inline-class-member method Class5|(core::int field) → self::Class5 /* = core::int */ {
+  lowered final self::Class5 /* = core::int */ #this = field;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:30:35: Error: 'field' was already initialized by this constructor.
   Class5(this.field) : this.field = 42;
                                   ^";
   return #this;
 }
-static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5
+static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5 /* = core::int */
   return self::Class5|(field);
-static inline-class-member method Class6|(core::int field) → self::Class6 {
-  lowered final self::Class6 #this = field;
+static inline-class-member method Class6|(core::int field) → self::Class6 /* = core::int */ {
+  lowered final self::Class6 /* = core::int */ #this = field;
   final dynamic #t3 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:36:29: Error: 'nonexisting' isn't an instance field of this class.
   Class6(this.field) : this.nonexisting = 42;
                             ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6
+static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6 /* = core::int */
   return self::Class6|(field);
diff --git a/pkg/front_end/testcases/inline_class/initializers.dart.weak.expect b/pkg/front_end/testcases/inline_class/initializers.dart.weak.expect
index 9400a66fff1..73bd7c8316c 100644
--- a/pkg/front_end/testcases/inline_class/initializers.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/initializers.dart.weak.expect
@@ -44,42 +44,42 @@ extension type Class6(core::int field) {
   constructor • = self::Class6|;
   tearoff • = self::Class6|_#new#tearOff;
 }
-static inline-class-member method Class1|(core::int field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(core::int field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|(core::int field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(core::int field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2 /* = core::int */
   return self::Class2|(field);
-static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
-  lowered final self::Class4 #this = field;
+static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */ {
+  lowered final self::Class4 /* = core::int */ #this = field;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:24:27: Error: 'nonexisting' isn't an instance field of this class.
   Class4(this.field, this.nonexisting);
                           ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */
   return self::Class4|(field, nonexisting);
-static inline-class-member method Class5|(core::int field) → self::Class5 {
-  lowered final self::Class5 #this = field;
+static inline-class-member method Class5|(core::int field) → self::Class5 /* = core::int */ {
+  lowered final self::Class5 /* = core::int */ #this = field;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:30:35: Error: 'field' was already initialized by this constructor.
   Class5(this.field) : this.field = 42;
                                   ^";
   return #this;
 }
-static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5
+static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5 /* = core::int */
   return self::Class5|(field);
-static inline-class-member method Class6|(core::int field) → self::Class6 {
-  lowered final self::Class6 #this = field;
+static inline-class-member method Class6|(core::int field) → self::Class6 /* = core::int */ {
+  lowered final self::Class6 /* = core::int */ #this = field;
   final dynamic #t3 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:36:29: Error: 'nonexisting' isn't an instance field of this class.
   Class6(this.field) : this.nonexisting = 42;
                             ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6
+static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6 /* = core::int */
   return self::Class6|(field);
diff --git a/pkg/front_end/testcases/inline_class/initializers.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/initializers.dart.weak.modular.expect
index 9400a66fff1..73bd7c8316c 100644
--- a/pkg/front_end/testcases/inline_class/initializers.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/initializers.dart.weak.modular.expect
@@ -44,42 +44,42 @@ extension type Class6(core::int field) {
   constructor • = self::Class6|;
   tearoff • = self::Class6|_#new#tearOff;
 }
-static inline-class-member method Class1|(core::int field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(core::int field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|(core::int field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(core::int field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2 /* = core::int */
   return self::Class2|(field);
-static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
-  lowered final self::Class4 #this = field;
+static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */ {
+  lowered final self::Class4 /* = core::int */ #this = field;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:24:27: Error: 'nonexisting' isn't an instance field of this class.
   Class4(this.field, this.nonexisting);
                           ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */
   return self::Class4|(field, nonexisting);
-static inline-class-member method Class5|(core::int field) → self::Class5 {
-  lowered final self::Class5 #this = field;
+static inline-class-member method Class5|(core::int field) → self::Class5 /* = core::int */ {
+  lowered final self::Class5 /* = core::int */ #this = field;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:30:35: Error: 'field' was already initialized by this constructor.
   Class5(this.field) : this.field = 42;
                                   ^";
   return #this;
 }
-static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5
+static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5 /* = core::int */
   return self::Class5|(field);
-static inline-class-member method Class6|(core::int field) → self::Class6 {
-  lowered final self::Class6 #this = field;
+static inline-class-member method Class6|(core::int field) → self::Class6 /* = core::int */ {
+  lowered final self::Class6 /* = core::int */ #this = field;
   final dynamic #t3 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:36:29: Error: 'nonexisting' isn't an instance field of this class.
   Class6(this.field) : this.nonexisting = 42;
                             ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6
+static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6 /* = core::int */
   return self::Class6|(field);
diff --git a/pkg/front_end/testcases/inline_class/initializers.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/initializers.dart.weak.outline.expect
index ba1a67fcc0a..56f7acf5e24 100644
--- a/pkg/front_end/testcases/inline_class/initializers.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/initializers.dart.weak.outline.expect
@@ -24,23 +24,23 @@ extension type Class6(core::int field) {
   constructor • = self::Class6|;
   tearoff • = self::Class6|_#new#tearOff;
 }
-static inline-class-member method Class1|(core::int field) → self::Class1
+static inline-class-member method Class1|(core::int field) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|(core::int field) → self::Class2
+static inline-class-member method Class2|(core::int field) → self::Class2 /* = core::int */
   ;
-static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2 /* = core::int */
   return self::Class2|(field);
-static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */
   ;
-static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */
   return self::Class4|(field, nonexisting);
-static inline-class-member method Class5|(core::int field) → self::Class5
+static inline-class-member method Class5|(core::int field) → self::Class5 /* = core::int */
   ;
-static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5
+static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5 /* = core::int */
   return self::Class5|(field);
-static inline-class-member method Class6|(core::int field) → self::Class6
+static inline-class-member method Class6|(core::int field) → self::Class6 /* = core::int */
   ;
-static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6
+static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6 /* = core::int */
   return self::Class6|(field);
diff --git a/pkg/front_end/testcases/inline_class/initializers.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/initializers.dart.weak.transformed.expect
index 9400a66fff1..73bd7c8316c 100644
--- a/pkg/front_end/testcases/inline_class/initializers.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/initializers.dart.weak.transformed.expect
@@ -44,42 +44,42 @@ extension type Class6(core::int field) {
   constructor • = self::Class6|;
   tearoff • = self::Class6|_#new#tearOff;
 }
-static inline-class-member method Class1|(core::int field) → self::Class1 {
-  lowered final self::Class1 #this = field;
+static inline-class-member method Class1|(core::int field) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1 /* = core::int */
   return self::Class1|(field);
-static inline-class-member method Class2|(core::int field) → self::Class2 {
-  lowered final self::Class2 #this = field;
+static inline-class-member method Class2|(core::int field) → self::Class2 /* = core::int */ {
+  lowered final self::Class2 /* = core::int */ #this = field;
   return #this;
 }
-static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2 /* = core::int */
   return self::Class2|(field);
-static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
-  lowered final self::Class4 #this = field;
+static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */ {
+  lowered final self::Class4 /* = core::int */ #this = field;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:24:27: Error: 'nonexisting' isn't an instance field of this class.
   Class4(this.field, this.nonexisting);
                           ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4 /* = core::int */
   return self::Class4|(field, nonexisting);
-static inline-class-member method Class5|(core::int field) → self::Class5 {
-  lowered final self::Class5 #this = field;
+static inline-class-member method Class5|(core::int field) → self::Class5 /* = core::int */ {
+  lowered final self::Class5 /* = core::int */ #this = field;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:30:35: Error: 'field' was already initialized by this constructor.
   Class5(this.field) : this.field = 42;
                                   ^";
   return #this;
 }
-static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5
+static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5 /* = core::int */
   return self::Class5|(field);
-static inline-class-member method Class6|(core::int field) → self::Class6 {
-  lowered final self::Class6 #this = field;
+static inline-class-member method Class6|(core::int field) → self::Class6 /* = core::int */ {
+  lowered final self::Class6 /* = core::int */ #this = field;
   final dynamic #t3 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:36:29: Error: 'nonexisting' isn't an instance field of this class.
   Class6(this.field) : this.nonexisting = 42;
                             ^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6
+static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6 /* = core::int */
   return self::Class6|(field);
diff --git a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.strong.expect b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.strong.expect
index 9fc77634003..0dc0894cdbc 100644
--- a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.strong.expect
@@ -17,16 +17,16 @@ extension type Class3<T extends core::Object? = dynamic>(core::List<T%> it) {
   constructor • = self::Class3|;
   tearoff • = self::Class3|_#new#tearOff;
 }
-static inline-class-member method Class1|(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> {
-  lowered final self::Class3<self::Class3|::T%> #this = it;
+static inline-class-member method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ {
+  lowered final self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%>
+static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%> /* = core::List<self::Class3|_#new#tearOff::T%> */
   return self::Class3|<self::Class3|_#new#tearOff::T%>(it);
-static method method(self::Class1 c1, self::Class3<core::int> c3) → dynamic {}
+static method method(self::Class1 /* = core::int */ c1, self::Class3<core::int> /* = core::List<core::int> */ c3) → dynamic {}
diff --git a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.strong.transformed.expect
index 989f1e84995..5ef231e4fba 100644
--- a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.strong.transformed.expect
@@ -17,16 +17,16 @@ extension type Class3<T extends core::Object? = dynamic>(core::List<T%> it) {
   constructor • = self::Class3|;
   tearoff • = self::Class3|_#new#tearOff;
 }
-static inline-class-member method Class1|(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> {
-  lowered final self::Class3<self::Class3|::T%> #this = it;
+static inline-class-member method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ {
+  lowered final self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%>
+static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%> /* = core::List<self::Class3|_#new#tearOff::T%> */
   return self::Class3|<self::Class3|_#new#tearOff::T%>(it);
-static method method(self::Class1 c1, self::Class3<core::int> c3) → dynamic {}
+static method method(self::Class1 /* = core::int */ c1, self::Class3<core::int> /* = core::List<core::int> */ c3) → dynamic {}
diff --git a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.expect b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.expect
index 9fc77634003..0dc0894cdbc 100644
--- a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.expect
@@ -17,16 +17,16 @@ extension type Class3<T extends core::Object? = dynamic>(core::List<T%> it) {
   constructor • = self::Class3|;
   tearoff • = self::Class3|_#new#tearOff;
 }
-static inline-class-member method Class1|(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> {
-  lowered final self::Class3<self::Class3|::T%> #this = it;
+static inline-class-member method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ {
+  lowered final self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%>
+static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%> /* = core::List<self::Class3|_#new#tearOff::T%> */
   return self::Class3|<self::Class3|_#new#tearOff::T%>(it);
-static method method(self::Class1 c1, self::Class3<core::int> c3) → dynamic {}
+static method method(self::Class1 /* = core::int */ c1, self::Class3<core::int> /* = core::List<core::int> */ c3) → dynamic {}
diff --git a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.modular.expect
index 9fc77634003..0dc0894cdbc 100644
--- a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.modular.expect
@@ -17,16 +17,16 @@ extension type Class3<T extends core::Object? = dynamic>(core::List<T%> it) {
   constructor • = self::Class3|;
   tearoff • = self::Class3|_#new#tearOff;
 }
-static inline-class-member method Class1|(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> {
-  lowered final self::Class3<self::Class3|::T%> #this = it;
+static inline-class-member method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ {
+  lowered final self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%>
+static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%> /* = core::List<self::Class3|_#new#tearOff::T%> */
   return self::Class3|<self::Class3|_#new#tearOff::T%>(it);
-static method method(self::Class1 c1, self::Class3<core::int> c3) → dynamic {}
+static method method(self::Class1 /* = core::int */ c1, self::Class3<core::int> /* = core::List<core::int> */ c3) → dynamic {}
diff --git a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.outline.expect
index 7fca0390346..5c631ff2d88 100644
--- a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.outline.expect
@@ -17,13 +17,13 @@ extension type Class3<T extends core::Object? = dynamic>(core::List<T%> it) {
   constructor • = self::Class3|;
   tearoff • = self::Class3|_#new#tearOff;
 }
-static inline-class-member method Class1|(core::int it) → self::Class1
+static inline-class-member method Class1|(core::int it) → self::Class1 /* = core::int */
   ;
-static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%>
+static inline-class-member method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */
   ;
-static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%>
+static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%> /* = core::List<self::Class3|_#new#tearOff::T%> */
   return self::Class3|<self::Class3|_#new#tearOff::T%>(it);
-static method method(self::Class1 c1, self::Class3<core::int> c3) → dynamic
+static method method(self::Class1 /* = core::int */ c1, self::Class3<core::int> /* = core::List<core::int> */ c3) → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.transformed.expect
index 989f1e84995..5ef231e4fba 100644
--- a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.transformed.expect
@@ -17,16 +17,16 @@ extension type Class3<T extends core::Object? = dynamic>(core::List<T%> it) {
   constructor • = self::Class3|;
   tearoff • = self::Class3|_#new#tearOff;
 }
-static inline-class-member method Class1|(core::int it) → self::Class1 {
-  lowered final self::Class1 #this = it;
+static inline-class-member method Class1|(core::int it) → self::Class1 /* = core::int */ {
+  lowered final self::Class1 /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1 /* = core::int */
   return self::Class1|(it);
-static inline-class-member method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> {
-  lowered final self::Class3<self::Class3|::T%> #this = it;
+static inline-class-member method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ {
+  lowered final self::Class3<self::Class3|::T%> /* = core::List<self::Class3|::T%> */ #this = it;
   return #this;
 }
-static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%>
+static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%> /* = core::List<self::Class3|_#new#tearOff::T%> */
   return self::Class3|<self::Class3|_#new#tearOff::T%>(it);
-static method method(self::Class1 c1, self::Class3<core::int> c3) → dynamic {}
+static method method(self::Class1 /* = core::int */ c1, self::Class3<core::int> /* = core::List<core::int> */ c3) → dynamic {}
diff --git a/pkg/front_end/testcases/inline_class/issue51146.dart.strong.expect b/pkg/front_end/testcases/inline_class/issue51146.dart.strong.expect
index 3d56eac0c24..7ab0ec4a5c7 100644
--- a/pkg/front_end/testcases/inline_class/issue51146.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/issue51146.dart.strong.expect
@@ -6,13 +6,13 @@ extension type I<X extends core::Object? = dynamic, Y extends core::Object? = dy
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> {
-  lowered final self::I<self::I|::X%, self::I|::Y%> #this = value;
+static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ {
+  lowered final self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ #this = value;
   return #this;
 }
-static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
+static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%> /* = self::I|_#new#tearOff::X% */
   return self::I|<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>(value);
-static method f(self::I<core::int, core::String> i) → void {}
+static method f(self::I<core::int, core::String> /* = core::int */ i) → void {}
 static method main() → void {
   self::f(self::I|<core::int, core::String>(2));
 }
diff --git a/pkg/front_end/testcases/inline_class/issue51146.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/issue51146.dart.strong.transformed.expect
index 3d56eac0c24..7ab0ec4a5c7 100644
--- a/pkg/front_end/testcases/inline_class/issue51146.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue51146.dart.strong.transformed.expect
@@ -6,13 +6,13 @@ extension type I<X extends core::Object? = dynamic, Y extends core::Object? = dy
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> {
-  lowered final self::I<self::I|::X%, self::I|::Y%> #this = value;
+static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ {
+  lowered final self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ #this = value;
   return #this;
 }
-static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
+static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%> /* = self::I|_#new#tearOff::X% */
   return self::I|<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>(value);
-static method f(self::I<core::int, core::String> i) → void {}
+static method f(self::I<core::int, core::String> /* = core::int */ i) → void {}
 static method main() → void {
   self::f(self::I|<core::int, core::String>(2));
 }
diff --git a/pkg/front_end/testcases/inline_class/issue51146.dart.weak.expect b/pkg/front_end/testcases/inline_class/issue51146.dart.weak.expect
index 3d56eac0c24..7ab0ec4a5c7 100644
--- a/pkg/front_end/testcases/inline_class/issue51146.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/issue51146.dart.weak.expect
@@ -6,13 +6,13 @@ extension type I<X extends core::Object? = dynamic, Y extends core::Object? = dy
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> {
-  lowered final self::I<self::I|::X%, self::I|::Y%> #this = value;
+static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ {
+  lowered final self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ #this = value;
   return #this;
 }
-static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
+static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%> /* = self::I|_#new#tearOff::X% */
   return self::I|<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>(value);
-static method f(self::I<core::int, core::String> i) → void {}
+static method f(self::I<core::int, core::String> /* = core::int */ i) → void {}
 static method main() → void {
   self::f(self::I|<core::int, core::String>(2));
 }
diff --git a/pkg/front_end/testcases/inline_class/issue51146.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/issue51146.dart.weak.modular.expect
index 3d56eac0c24..7ab0ec4a5c7 100644
--- a/pkg/front_end/testcases/inline_class/issue51146.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/issue51146.dart.weak.modular.expect
@@ -6,13 +6,13 @@ extension type I<X extends core::Object? = dynamic, Y extends core::Object? = dy
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> {
-  lowered final self::I<self::I|::X%, self::I|::Y%> #this = value;
+static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ {
+  lowered final self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ #this = value;
   return #this;
 }
-static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
+static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%> /* = self::I|_#new#tearOff::X% */
   return self::I|<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>(value);
-static method f(self::I<core::int, core::String> i) → void {}
+static method f(self::I<core::int, core::String> /* = core::int */ i) → void {}
 static method main() → void {
   self::f(self::I|<core::int, core::String>(2));
 }
diff --git a/pkg/front_end/testcases/inline_class/issue51146.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/issue51146.dart.weak.outline.expect
index 117d30afad4..f719b038711 100644
--- a/pkg/front_end/testcases/inline_class/issue51146.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/issue51146.dart.weak.outline.expect
@@ -6,11 +6,11 @@ extension type I<X extends core::Object? = dynamic, Y extends core::Object? = dy
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%>
+static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */
   ;
-static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
+static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%> /* = self::I|_#new#tearOff::X% */
   return self::I|<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>(value);
-static method f(self::I<core::int, core::String> i) → void
+static method f(self::I<core::int, core::String> /* = core::int */ i) → void
   ;
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/issue51146.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/issue51146.dart.weak.transformed.expect
index 3d56eac0c24..7ab0ec4a5c7 100644
--- a/pkg/front_end/testcases/inline_class/issue51146.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue51146.dart.weak.transformed.expect
@@ -6,13 +6,13 @@ extension type I<X extends core::Object? = dynamic, Y extends core::Object? = dy
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> {
-  lowered final self::I<self::I|::X%, self::I|::Y%> #this = value;
+static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ {
+  lowered final self::I<self::I|::X%, self::I|::Y%> /* = self::I|::X% */ #this = value;
   return #this;
 }
-static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
+static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%> /* = self::I|_#new#tearOff::X% */
   return self::I|<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>(value);
-static method f(self::I<core::int, core::String> i) → void {}
+static method f(self::I<core::int, core::String> /* = core::int */ i) → void {}
 static method main() → void {
   self::f(self::I|<core::int, core::String>(2));
 }
diff --git a/pkg/front_end/testcases/inline_class/issue51285.dart.strong.expect b/pkg/front_end/testcases/inline_class/issue51285.dart.strong.expect
index 5b15c989ea7..04ecd65685d 100644
--- a/pkg/front_end/testcases/inline_class/issue51285.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/issue51285.dart.strong.expect
@@ -18,40 +18,40 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method J|_(core::int i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(core::int i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/inline_class/issue51285.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/issue51285.dart.strong.transformed.expect
index 5b15c989ea7..04ecd65685d 100644
--- a/pkg/front_end/testcases/inline_class/issue51285.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue51285.dart.strong.transformed.expect
@@ -18,40 +18,40 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method J|_(core::int i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(core::int i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/inline_class/issue51285.dart.weak.expect b/pkg/front_end/testcases/inline_class/issue51285.dart.weak.expect
index 8bb96fd5ab2..415dbdd774d 100644
--- a/pkg/front_end/testcases/inline_class/issue51285.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/issue51285.dart.weak.expect
@@ -18,40 +18,40 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method J|_(core::int i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(core::int i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/inline_class/issue51285.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/issue51285.dart.weak.modular.expect
index 8bb96fd5ab2..415dbdd774d 100644
--- a/pkg/front_end/testcases/inline_class/issue51285.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/issue51285.dart.weak.modular.expect
@@ -18,40 +18,40 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method J|_(core::int i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(core::int i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/inline_class/issue51285.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/issue51285.dart.weak.outline.expect
index a12caa52c2e..74a17bc5f71 100644
--- a/pkg/front_end/testcases/inline_class/issue51285.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/issue51285.dart.weak.outline.expect
@@ -18,25 +18,25 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static inline-class-member method I|() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
   ;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   ;
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method J|_(core::int i) → self::J
+static inline-class-member method J|_(core::int i) → self::J /* = core::int */
   ;
-static inline-class-member method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   ;
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%>
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> /* = self::K|_::T% */
   ;
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/issue51285.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/issue51285.dart.weak.transformed.expect
index 8bb96fd5ab2..415dbdd774d 100644
--- a/pkg/front_end/testcases/inline_class/issue51285.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue51285.dart.weak.transformed.expect
@@ -18,40 +18,40 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static inline-class-member method I|() → self::I
-  return 0 as self::I;
-static inline-class-member method I|_#new#tearOff() → self::I
+static inline-class-member method I|() → self::I /* = core::int */
+  return 0 as self::I /* = core::int */;
+static inline-class-member method I|_#new#tearOff() → self::I /* = core::int */
   return self::I|();
-static inline-class-member method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J /* = core::int */
   return self::J|(i);
-static inline-class-member method J|_(core::int i) → self::J {
-  lowered final self::J #this = i;
+static inline-class-member method J|_(core::int i) → self::J /* = core::int */ {
+  lowered final self::J /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J /* = core::int */
   return self::J|_(i);
-static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%> /* = self::K|::T% */
   return self::K|_<self::K|::T%>(i);
-static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%> /* = self::K|_#new#tearOff::T% */
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
-  lowered final self::K<self::K|_::T%> #this = i;
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> /* = self::K|_::T% */ {
+  lowered final self::K<self::K|_::T%> /* = self::K|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%> /* = self::K|_#_#tearOff::T% */
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
-  self::expect(0, #C1(){() → self::I});
+  self::expect(0, #C1(){() → self::I /* = core::int */});
   self::expect(42, self::J|(42));
   self::expect(87, self::J|(87));
-  self::expect(123, #C2(123){(core::int) → self::J});
+  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
   self::expect("foo", self::K|<core::String>("foo"));
   self::expect("bar", self::K|<core::String>("bar"));
-  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>});
-  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String> /* = core::String */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String> /* = core::String */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))
diff --git a/pkg/front_end/testcases/inline_class/issue51299.dart.strong.expect b/pkg/front_end/testcases/inline_class/issue51299.dart.strong.expect
index 37c04586ac8..28b40dc7e07 100644
--- a/pkg/front_end/testcases/inline_class/issue51299.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/issue51299.dart.strong.expect
@@ -6,6 +6,6 @@ extension type I(invalid-type #) {
   get i = self::I|get#i;
   set i = self::I|set#i;
 }
-static inline-class-member method I|get#i(lowered final self::I #this) → core::int
+static inline-class-member method I|get#i(lowered final self::I /* = invalid-type */ #this) → core::int
   return 0;
-static inline-class-member method I|set#i(lowered final self::I #this, core::int val) → void {}
+static inline-class-member method I|set#i(lowered final self::I /* = invalid-type */ #this, core::int val) → void {}
diff --git a/pkg/front_end/testcases/inline_class/issue51299.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/issue51299.dart.strong.transformed.expect
index 37c04586ac8..28b40dc7e07 100644
--- a/pkg/front_end/testcases/inline_class/issue51299.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue51299.dart.strong.transformed.expect
@@ -6,6 +6,6 @@ extension type I(invalid-type #) {
   get i = self::I|get#i;
   set i = self::I|set#i;
 }
-static inline-class-member method I|get#i(lowered final self::I #this) → core::int
+static inline-class-member method I|get#i(lowered final self::I /* = invalid-type */ #this) → core::int
   return 0;
-static inline-class-member method I|set#i(lowered final self::I #this, core::int val) → void {}
+static inline-class-member method I|set#i(lowered final self::I /* = invalid-type */ #this, core::int val) → void {}
diff --git a/pkg/front_end/testcases/inline_class/issue51299.dart.weak.expect b/pkg/front_end/testcases/inline_class/issue51299.dart.weak.expect
index 37c04586ac8..28b40dc7e07 100644
--- a/pkg/front_end/testcases/inline_class/issue51299.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/issue51299.dart.weak.expect
@@ -6,6 +6,6 @@ extension type I(invalid-type #) {
   get i = self::I|get#i;
   set i = self::I|set#i;
 }
-static inline-class-member method I|get#i(lowered final self::I #this) → core::int
+static inline-class-member method I|get#i(lowered final self::I /* = invalid-type */ #this) → core::int
   return 0;
-static inline-class-member method I|set#i(lowered final self::I #this, core::int val) → void {}
+static inline-class-member method I|set#i(lowered final self::I /* = invalid-type */ #this, core::int val) → void {}
diff --git a/pkg/front_end/testcases/inline_class/issue51299.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/issue51299.dart.weak.modular.expect
index 37c04586ac8..28b40dc7e07 100644
--- a/pkg/front_end/testcases/inline_class/issue51299.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/issue51299.dart.weak.modular.expect
@@ -6,6 +6,6 @@ extension type I(invalid-type #) {
   get i = self::I|get#i;
   set i = self::I|set#i;
 }
-static inline-class-member method I|get#i(lowered final self::I #this) → core::int
+static inline-class-member method I|get#i(lowered final self::I /* = invalid-type */ #this) → core::int
   return 0;
-static inline-class-member method I|set#i(lowered final self::I #this, core::int val) → void {}
+static inline-class-member method I|set#i(lowered final self::I /* = invalid-type */ #this, core::int val) → void {}
diff --git a/pkg/front_end/testcases/inline_class/issue51299.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/issue51299.dart.weak.outline.expect
index d22bd0c3dd8..37c077d816f 100644
--- a/pkg/front_end/testcases/inline_class/issue51299.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/issue51299.dart.weak.outline.expect
@@ -6,7 +6,7 @@ extension type I(invalid-type #) {
   get i = self::I|get#i;
   set i = self::I|set#i;
 }
-static inline-class-member method I|get#i(lowered final self::I #this) → core::int
+static inline-class-member method I|get#i(lowered final self::I /* = invalid-type */ #this) → core::int
   ;
-static inline-class-member method I|set#i(lowered final self::I #this, core::int val) → void
+static inline-class-member method I|set#i(lowered final self::I /* = invalid-type */ #this, core::int val) → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/issue51299.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/issue51299.dart.weak.transformed.expect
index 37c04586ac8..28b40dc7e07 100644
--- a/pkg/front_end/testcases/inline_class/issue51299.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue51299.dart.weak.transformed.expect
@@ -6,6 +6,6 @@ extension type I(invalid-type #) {
   get i = self::I|get#i;
   set i = self::I|set#i;
 }
-static inline-class-member method I|get#i(lowered final self::I #this) → core::int
+static inline-class-member method I|get#i(lowered final self::I /* = invalid-type */ #this) → core::int
   return 0;
-static inline-class-member method I|set#i(lowered final self::I #this, core::int val) → void {}
+static inline-class-member method I|set#i(lowered final self::I /* = invalid-type */ #this, core::int val) → void {}
diff --git a/pkg/front_end/testcases/inline_class/issue51556.dart.strong.expect b/pkg/front_end/testcases/inline_class/issue51556.dart.strong.expect
index ab1360fa08f..e022a7a8b69 100644
--- a/pkg/front_end/testcases/inline_class/issue51556.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/issue51556.dart.strong.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension ObjectToJSExportedDartObject on core::Object {
   get toJS = self::ObjectToJSExportedDartObject|get#toJS;
 }
-extension ListToJSArray on core::List<self::JSAny?> {
+extension ListToJSArray on core::List<self::JSAny? /* = core::Object? */> {
   get toJS = self::ListToJSArray|get#toJS;
 }
 extension DoubleToJSNumber on core::double {
@@ -15,58 +15,58 @@ extension type JSAny(core::Object value) {
   constructor • = self::JSAny|;
   tearoff • = self::JSAny|_#new#tearOff;
 }
-extension type JSObject(core::Object value) implements self::JSAny {
+extension type JSObject(core::Object value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSObject|;
   tearoff • = self::JSObject|_#new#tearOff;
 }
-extension type JSArray(core::List<self::JSAny?> value) implements self::JSObject {
+extension type JSArray(core::List<self::JSAny? /* = core::Object? */> value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSArray|;
   tearoff • = self::JSArray|_#new#tearOff;
 }
-extension type JSExportedDartObject(core::Object value) implements self::JSObject {
+extension type JSExportedDartObject(core::Object value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSExportedDartObject|;
   tearoff • = self::JSExportedDartObject|_#new#tearOff;
 }
-extension type JSNumber(core::double value) implements self::JSAny {
+extension type JSNumber(core::double value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSNumber|;
   tearoff • = self::JSNumber|_#new#tearOff;
 }
-static inline-class-member method JSAny|(core::Object value) → self::JSAny {
-  lowered final self::JSAny #this = value;
+static inline-class-member method JSAny|(core::Object value) → self::JSAny /* = core::Object */ {
+  lowered final self::JSAny /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSAny|_#new#tearOff(core::Object value) → self::JSAny
+static inline-class-member method JSAny|_#new#tearOff(core::Object value) → self::JSAny /* = core::Object */
   return self::JSAny|(value);
-static inline-class-member method JSObject|(core::Object value) → self::JSObject {
-  lowered final self::JSObject #this = value;
+static inline-class-member method JSObject|(core::Object value) → self::JSObject /* = core::Object */ {
+  lowered final self::JSObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSObject|_#new#tearOff(core::Object value) → self::JSObject
+static inline-class-member method JSObject|_#new#tearOff(core::Object value) → self::JSObject /* = core::Object */
   return self::JSObject|(value);
-static inline-class-member method JSArray|(core::List<self::JSAny?> value) → self::JSArray {
-  lowered final self::JSArray #this = value;
+static inline-class-member method JSArray|(core::List<self::JSAny? /* = core::Object? */> value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ {
+  lowered final self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ #this = value;
   return #this;
 }
-static inline-class-member method JSArray|_#new#tearOff(core::List<self::JSAny?> value) → self::JSArray
+static inline-class-member method JSArray|_#new#tearOff(core::List<self::JSAny? /* = core::Object? */> value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(value);
-static inline-class-member method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject {
-  lowered final self::JSExportedDartObject #this = value;
+static inline-class-member method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject /* = core::Object */ {
+  lowered final self::JSExportedDartObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(value);
-static inline-class-member method JSNumber|(core::double value) → self::JSNumber {
-  lowered final self::JSNumber #this = value;
+static inline-class-member method JSNumber|(core::double value) → self::JSNumber /* = core::double */ {
+  lowered final self::JSNumber /* = core::double */ #this = value;
   return #this;
 }
-static inline-class-member method JSNumber|_#new#tearOff(core::double value) → self::JSNumber
+static inline-class-member method JSNumber|_#new#tearOff(core::double value) → self::JSNumber /* = core::double */
   return self::JSNumber|(value);
-static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
+static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(#this);
-static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
+static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny? /* = core::Object? */> #this) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(#this);
-static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
+static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber /* = core::double */
   return self::JSNumber|(#this);
 static method main() → void {
-  self::JSArray arr = self::ListToJSArray|get#toJS(<self::JSAny>[self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")]);
+  self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ arr = self::ListToJSArray|get#toJS(<self::JSAny /* = core::Object */>[self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")]);
 }
diff --git a/pkg/front_end/testcases/inline_class/issue51556.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/issue51556.dart.strong.transformed.expect
index dc861f90d80..2fbb243fc5c 100644
--- a/pkg/front_end/testcases/inline_class/issue51556.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue51556.dart.strong.transformed.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension ObjectToJSExportedDartObject on core::Object {
   get toJS = self::ObjectToJSExportedDartObject|get#toJS;
 }
-extension ListToJSArray on core::List<self::JSAny?> {
+extension ListToJSArray on core::List<self::JSAny? /* = core::Object? */> {
   get toJS = self::ListToJSArray|get#toJS;
 }
 extension DoubleToJSNumber on core::double {
@@ -15,58 +15,58 @@ extension type JSAny(core::Object value) {
   constructor • = self::JSAny|;
   tearoff • = self::JSAny|_#new#tearOff;
 }
-extension type JSObject(core::Object value) implements self::JSAny {
+extension type JSObject(core::Object value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSObject|;
   tearoff • = self::JSObject|_#new#tearOff;
 }
-extension type JSArray(core::List<self::JSAny?> value) implements self::JSObject {
+extension type JSArray(core::List<self::JSAny? /* = core::Object? */> value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSArray|;
   tearoff • = self::JSArray|_#new#tearOff;
 }
-extension type JSExportedDartObject(core::Object value) implements self::JSObject {
+extension type JSExportedDartObject(core::Object value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSExportedDartObject|;
   tearoff • = self::JSExportedDartObject|_#new#tearOff;
 }
-extension type JSNumber(core::double value) implements self::JSAny {
+extension type JSNumber(core::double value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSNumber|;
   tearoff • = self::JSNumber|_#new#tearOff;
 }
-static inline-class-member method JSAny|(core::Object value) → self::JSAny {
-  lowered final self::JSAny #this = value;
+static inline-class-member method JSAny|(core::Object value) → self::JSAny /* = core::Object */ {
+  lowered final self::JSAny /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSAny|_#new#tearOff(core::Object value) → self::JSAny
+static inline-class-member method JSAny|_#new#tearOff(core::Object value) → self::JSAny /* = core::Object */
   return self::JSAny|(value);
-static inline-class-member method JSObject|(core::Object value) → self::JSObject {
-  lowered final self::JSObject #this = value;
+static inline-class-member method JSObject|(core::Object value) → self::JSObject /* = core::Object */ {
+  lowered final self::JSObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSObject|_#new#tearOff(core::Object value) → self::JSObject
+static inline-class-member method JSObject|_#new#tearOff(core::Object value) → self::JSObject /* = core::Object */
   return self::JSObject|(value);
-static inline-class-member method JSArray|(core::List<self::JSAny?> value) → self::JSArray {
-  lowered final self::JSArray #this = value;
+static inline-class-member method JSArray|(core::List<self::JSAny? /* = core::Object? */> value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ {
+  lowered final self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ #this = value;
   return #this;
 }
-static inline-class-member method JSArray|_#new#tearOff(core::List<self::JSAny?> value) → self::JSArray
+static inline-class-member method JSArray|_#new#tearOff(core::List<self::JSAny? /* = core::Object? */> value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(value);
-static inline-class-member method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject {
-  lowered final self::JSExportedDartObject #this = value;
+static inline-class-member method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject /* = core::Object */ {
+  lowered final self::JSExportedDartObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(value);
-static inline-class-member method JSNumber|(core::double value) → self::JSNumber {
-  lowered final self::JSNumber #this = value;
+static inline-class-member method JSNumber|(core::double value) → self::JSNumber /* = core::double */ {
+  lowered final self::JSNumber /* = core::double */ #this = value;
   return #this;
 }
-static inline-class-member method JSNumber|_#new#tearOff(core::double value) → self::JSNumber
+static inline-class-member method JSNumber|_#new#tearOff(core::double value) → self::JSNumber /* = core::double */
   return self::JSNumber|(value);
-static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
+static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(#this);
-static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
+static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny? /* = core::Object? */> #this) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(#this);
-static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
+static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber /* = core::double */
   return self::JSNumber|(#this);
 static method main() → void {
-  self::JSArray arr = self::ListToJSArray|get#toJS(core::_GrowableList::_literal2<self::JSAny>(self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")));
+  self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ arr = self::ListToJSArray|get#toJS(core::_GrowableList::_literal2<self::JSAny /* = core::Object */>(self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")));
 }
diff --git a/pkg/front_end/testcases/inline_class/issue51556.dart.weak.expect b/pkg/front_end/testcases/inline_class/issue51556.dart.weak.expect
index ab1360fa08f..e022a7a8b69 100644
--- a/pkg/front_end/testcases/inline_class/issue51556.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/issue51556.dart.weak.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension ObjectToJSExportedDartObject on core::Object {
   get toJS = self::ObjectToJSExportedDartObject|get#toJS;
 }
-extension ListToJSArray on core::List<self::JSAny?> {
+extension ListToJSArray on core::List<self::JSAny? /* = core::Object? */> {
   get toJS = self::ListToJSArray|get#toJS;
 }
 extension DoubleToJSNumber on core::double {
@@ -15,58 +15,58 @@ extension type JSAny(core::Object value) {
   constructor • = self::JSAny|;
   tearoff • = self::JSAny|_#new#tearOff;
 }
-extension type JSObject(core::Object value) implements self::JSAny {
+extension type JSObject(core::Object value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSObject|;
   tearoff • = self::JSObject|_#new#tearOff;
 }
-extension type JSArray(core::List<self::JSAny?> value) implements self::JSObject {
+extension type JSArray(core::List<self::JSAny? /* = core::Object? */> value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSArray|;
   tearoff • = self::JSArray|_#new#tearOff;
 }
-extension type JSExportedDartObject(core::Object value) implements self::JSObject {
+extension type JSExportedDartObject(core::Object value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSExportedDartObject|;
   tearoff • = self::JSExportedDartObject|_#new#tearOff;
 }
-extension type JSNumber(core::double value) implements self::JSAny {
+extension type JSNumber(core::double value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSNumber|;
   tearoff • = self::JSNumber|_#new#tearOff;
 }
-static inline-class-member method JSAny|(core::Object value) → self::JSAny {
-  lowered final self::JSAny #this = value;
+static inline-class-member method JSAny|(core::Object value) → self::JSAny /* = core::Object */ {
+  lowered final self::JSAny /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSAny|_#new#tearOff(core::Object value) → self::JSAny
+static inline-class-member method JSAny|_#new#tearOff(core::Object value) → self::JSAny /* = core::Object */
   return self::JSAny|(value);
-static inline-class-member method JSObject|(core::Object value) → self::JSObject {
-  lowered final self::JSObject #this = value;
+static inline-class-member method JSObject|(core::Object value) → self::JSObject /* = core::Object */ {
+  lowered final self::JSObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSObject|_#new#tearOff(core::Object value) → self::JSObject
+static inline-class-member method JSObject|_#new#tearOff(core::Object value) → self::JSObject /* = core::Object */
   return self::JSObject|(value);
-static inline-class-member method JSArray|(core::List<self::JSAny?> value) → self::JSArray {
-  lowered final self::JSArray #this = value;
+static inline-class-member method JSArray|(core::List<self::JSAny? /* = core::Object? */> value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ {
+  lowered final self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ #this = value;
   return #this;
 }
-static inline-class-member method JSArray|_#new#tearOff(core::List<self::JSAny?> value) → self::JSArray
+static inline-class-member method JSArray|_#new#tearOff(core::List<self::JSAny? /* = core::Object? */> value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(value);
-static inline-class-member method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject {
-  lowered final self::JSExportedDartObject #this = value;
+static inline-class-member method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject /* = core::Object */ {
+  lowered final self::JSExportedDartObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(value);
-static inline-class-member method JSNumber|(core::double value) → self::JSNumber {
-  lowered final self::JSNumber #this = value;
+static inline-class-member method JSNumber|(core::double value) → self::JSNumber /* = core::double */ {
+  lowered final self::JSNumber /* = core::double */ #this = value;
   return #this;
 }
-static inline-class-member method JSNumber|_#new#tearOff(core::double value) → self::JSNumber
+static inline-class-member method JSNumber|_#new#tearOff(core::double value) → self::JSNumber /* = core::double */
   return self::JSNumber|(value);
-static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
+static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(#this);
-static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
+static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny? /* = core::Object? */> #this) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(#this);
-static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
+static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber /* = core::double */
   return self::JSNumber|(#this);
 static method main() → void {
-  self::JSArray arr = self::ListToJSArray|get#toJS(<self::JSAny>[self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")]);
+  self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ arr = self::ListToJSArray|get#toJS(<self::JSAny /* = core::Object */>[self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")]);
 }
diff --git a/pkg/front_end/testcases/inline_class/issue51556.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/issue51556.dart.weak.modular.expect
index ab1360fa08f..e022a7a8b69 100644
--- a/pkg/front_end/testcases/inline_class/issue51556.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/issue51556.dart.weak.modular.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension ObjectToJSExportedDartObject on core::Object {
   get toJS = self::ObjectToJSExportedDartObject|get#toJS;
 }
-extension ListToJSArray on core::List<self::JSAny?> {
+extension ListToJSArray on core::List<self::JSAny? /* = core::Object? */> {
   get toJS = self::ListToJSArray|get#toJS;
 }
 extension DoubleToJSNumber on core::double {
@@ -15,58 +15,58 @@ extension type JSAny(core::Object value) {
   constructor • = self::JSAny|;
   tearoff • = self::JSAny|_#new#tearOff;
 }
-extension type JSObject(core::Object value) implements self::JSAny {
+extension type JSObject(core::Object value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSObject|;
   tearoff • = self::JSObject|_#new#tearOff;
 }
-extension type JSArray(core::List<self::JSAny?> value) implements self::JSObject {
+extension type JSArray(core::List<self::JSAny? /* = core::Object? */> value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSArray|;
   tearoff • = self::JSArray|_#new#tearOff;
 }
-extension type JSExportedDartObject(core::Object value) implements self::JSObject {
+extension type JSExportedDartObject(core::Object value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSExportedDartObject|;
   tearoff • = self::JSExportedDartObject|_#new#tearOff;
 }
-extension type JSNumber(core::double value) implements self::JSAny {
+extension type JSNumber(core::double value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSNumber|;
   tearoff • = self::JSNumber|_#new#tearOff;
 }
-static inline-class-member method JSAny|(core::Object value) → self::JSAny {
-  lowered final self::JSAny #this = value;
+static inline-class-member method JSAny|(core::Object value) → self::JSAny /* = core::Object */ {
+  lowered final self::JSAny /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSAny|_#new#tearOff(core::Object value) → self::JSAny
+static inline-class-member method JSAny|_#new#tearOff(core::Object value) → self::JSAny /* = core::Object */
   return self::JSAny|(value);
-static inline-class-member method JSObject|(core::Object value) → self::JSObject {
-  lowered final self::JSObject #this = value;
+static inline-class-member method JSObject|(core::Object value) → self::JSObject /* = core::Object */ {
+  lowered final self::JSObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSObject|_#new#tearOff(core::Object value) → self::JSObject
+static inline-class-member method JSObject|_#new#tearOff(core::Object value) → self::JSObject /* = core::Object */
   return self::JSObject|(value);
-static inline-class-member method JSArray|(core::List<self::JSAny?> value) → self::JSArray {
-  lowered final self::JSArray #this = value;
+static inline-class-member method JSArray|(core::List<self::JSAny? /* = core::Object? */> value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ {
+  lowered final self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ #this = value;
   return #this;
 }
-static inline-class-member method JSArray|_#new#tearOff(core::List<self::JSAny?> value) → self::JSArray
+static inline-class-member method JSArray|_#new#tearOff(core::List<self::JSAny? /* = core::Object? */> value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(value);
-static inline-class-member method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject {
-  lowered final self::JSExportedDartObject #this = value;
+static inline-class-member method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject /* = core::Object */ {
+  lowered final self::JSExportedDartObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(value);
-static inline-class-member method JSNumber|(core::double value) → self::JSNumber {
-  lowered final self::JSNumber #this = value;
+static inline-class-member method JSNumber|(core::double value) → self::JSNumber /* = core::double */ {
+  lowered final self::JSNumber /* = core::double */ #this = value;
   return #this;
 }
-static inline-class-member method JSNumber|_#new#tearOff(core::double value) → self::JSNumber
+static inline-class-member method JSNumber|_#new#tearOff(core::double value) → self::JSNumber /* = core::double */
   return self::JSNumber|(value);
-static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
+static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(#this);
-static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
+static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny? /* = core::Object? */> #this) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(#this);
-static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
+static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber /* = core::double */
   return self::JSNumber|(#this);
 static method main() → void {
-  self::JSArray arr = self::ListToJSArray|get#toJS(<self::JSAny>[self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")]);
+  self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ arr = self::ListToJSArray|get#toJS(<self::JSAny /* = core::Object */>[self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")]);
 }
diff --git a/pkg/front_end/testcases/inline_class/issue51556.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/issue51556.dart.weak.outline.expect
index d8520ab19a4..65a787e3149 100644
--- a/pkg/front_end/testcases/inline_class/issue51556.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/issue51556.dart.weak.outline.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension ObjectToJSExportedDartObject on core::Object {
   get toJS = self::ObjectToJSExportedDartObject|get#toJS;
 }
-extension ListToJSArray on core::List<self::JSAny?> {
+extension ListToJSArray on core::List<self::JSAny? /* = core::Object? */> {
   get toJS = self::ListToJSArray|get#toJS;
 }
 extension DoubleToJSNumber on core::double {
@@ -15,47 +15,47 @@ extension type JSAny(core::Object value) {
   constructor • = self::JSAny|;
   tearoff • = self::JSAny|_#new#tearOff;
 }
-extension type JSObject(core::Object value) implements self::JSAny {
+extension type JSObject(core::Object value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSObject|;
   tearoff • = self::JSObject|_#new#tearOff;
 }
-extension type JSArray(core::List<self::JSAny?> value) implements self::JSObject {
+extension type JSArray(core::List<self::JSAny? /* = core::Object? */> value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSArray|;
   tearoff • = self::JSArray|_#new#tearOff;
 }
-extension type JSExportedDartObject(core::Object value) implements self::JSObject {
+extension type JSExportedDartObject(core::Object value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSExportedDartObject|;
   tearoff • = self::JSExportedDartObject|_#new#tearOff;
 }
-extension type JSNumber(core::double value) implements self::JSAny {
+extension type JSNumber(core::double value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSNumber|;
   tearoff • = self::JSNumber|_#new#tearOff;
 }
-static inline-class-member method JSAny|(core::Object value) → self::JSAny
+static inline-class-member method JSAny|(core::Object value) → self::JSAny /* = core::Object */
   ;
-static inline-class-member method JSAny|_#new#tearOff(core::Object value) → self::JSAny
+static inline-class-member method JSAny|_#new#tearOff(core::Object value) → self::JSAny /* = core::Object */
   return self::JSAny|(value);
-static inline-class-member method JSObject|(core::Object value) → self::JSObject
+static inline-class-member method JSObject|(core::Object value) → self::JSObject /* = core::Object */
   ;
-static inline-class-member method JSObject|_#new#tearOff(core::Object value) → self::JSObject
+static inline-class-member method JSObject|_#new#tearOff(core::Object value) → self::JSObject /* = core::Object */
   return self::JSObject|(value);
-static inline-class-member method JSArray|(core::List<self::JSAny?> value) → self::JSArray
+static inline-class-member method JSArray|(core::List<self::JSAny? /* = core::Object? */> value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   ;
-static inline-class-member method JSArray|_#new#tearOff(core::List<self::JSAny?> value) → self::JSArray
+static inline-class-member method JSArray|_#new#tearOff(core::List<self::JSAny? /* = core::Object? */> value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(value);
-static inline-class-member method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject /* = core::Object */
   ;
-static inline-class-member method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(value);
-static inline-class-member method JSNumber|(core::double value) → self::JSNumber
+static inline-class-member method JSNumber|(core::double value) → self::JSNumber /* = core::double */
   ;
-static inline-class-member method JSNumber|_#new#tearOff(core::double value) → self::JSNumber
+static inline-class-member method JSNumber|_#new#tearOff(core::double value) → self::JSNumber /* = core::double */
   return self::JSNumber|(value);
-static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
+static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject /* = core::Object */
   ;
-static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
+static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny? /* = core::Object? */> #this) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   ;
-static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
+static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber /* = core::double */
   ;
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/issue51556.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/issue51556.dart.weak.transformed.expect
index dc861f90d80..2fbb243fc5c 100644
--- a/pkg/front_end/testcases/inline_class/issue51556.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue51556.dart.weak.transformed.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension ObjectToJSExportedDartObject on core::Object {
   get toJS = self::ObjectToJSExportedDartObject|get#toJS;
 }
-extension ListToJSArray on core::List<self::JSAny?> {
+extension ListToJSArray on core::List<self::JSAny? /* = core::Object? */> {
   get toJS = self::ListToJSArray|get#toJS;
 }
 extension DoubleToJSNumber on core::double {
@@ -15,58 +15,58 @@ extension type JSAny(core::Object value) {
   constructor • = self::JSAny|;
   tearoff • = self::JSAny|_#new#tearOff;
 }
-extension type JSObject(core::Object value) implements self::JSAny {
+extension type JSObject(core::Object value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSObject|;
   tearoff • = self::JSObject|_#new#tearOff;
 }
-extension type JSArray(core::List<self::JSAny?> value) implements self::JSObject {
+extension type JSArray(core::List<self::JSAny? /* = core::Object? */> value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSArray|;
   tearoff • = self::JSArray|_#new#tearOff;
 }
-extension type JSExportedDartObject(core::Object value) implements self::JSObject {
+extension type JSExportedDartObject(core::Object value) implements self::JSObject /* = core::Object */ {
   constructor • = self::JSExportedDartObject|;
   tearoff • = self::JSExportedDartObject|_#new#tearOff;
 }
-extension type JSNumber(core::double value) implements self::JSAny {
+extension type JSNumber(core::double value) implements self::JSAny /* = core::Object */ {
   constructor • = self::JSNumber|;
   tearoff • = self::JSNumber|_#new#tearOff;
 }
-static inline-class-member method JSAny|(core::Object value) → self::JSAny {
-  lowered final self::JSAny #this = value;
+static inline-class-member method JSAny|(core::Object value) → self::JSAny /* = core::Object */ {
+  lowered final self::JSAny /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSAny|_#new#tearOff(core::Object value) → self::JSAny
+static inline-class-member method JSAny|_#new#tearOff(core::Object value) → self::JSAny /* = core::Object */
   return self::JSAny|(value);
-static inline-class-member method JSObject|(core::Object value) → self::JSObject {
-  lowered final self::JSObject #this = value;
+static inline-class-member method JSObject|(core::Object value) → self::JSObject /* = core::Object */ {
+  lowered final self::JSObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSObject|_#new#tearOff(core::Object value) → self::JSObject
+static inline-class-member method JSObject|_#new#tearOff(core::Object value) → self::JSObject /* = core::Object */
   return self::JSObject|(value);
-static inline-class-member method JSArray|(core::List<self::JSAny?> value) → self::JSArray {
-  lowered final self::JSArray #this = value;
+static inline-class-member method JSArray|(core::List<self::JSAny? /* = core::Object? */> value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ {
+  lowered final self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ #this = value;
   return #this;
 }
-static inline-class-member method JSArray|_#new#tearOff(core::List<self::JSAny?> value) → self::JSArray
+static inline-class-member method JSArray|_#new#tearOff(core::List<self::JSAny? /* = core::Object? */> value) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(value);
-static inline-class-member method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject {
-  lowered final self::JSExportedDartObject #this = value;
+static inline-class-member method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject /* = core::Object */ {
+  lowered final self::JSExportedDartObject /* = core::Object */ #this = value;
   return #this;
 }
-static inline-class-member method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(value);
-static inline-class-member method JSNumber|(core::double value) → self::JSNumber {
-  lowered final self::JSNumber #this = value;
+static inline-class-member method JSNumber|(core::double value) → self::JSNumber /* = core::double */ {
+  lowered final self::JSNumber /* = core::double */ #this = value;
   return #this;
 }
-static inline-class-member method JSNumber|_#new#tearOff(core::double value) → self::JSNumber
+static inline-class-member method JSNumber|_#new#tearOff(core::double value) → self::JSNumber /* = core::double */
   return self::JSNumber|(value);
-static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
+static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject /* = core::Object */
   return self::JSExportedDartObject|(#this);
-static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
+static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny? /* = core::Object? */> #this) → self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */
   return self::JSArray|(#this);
-static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
+static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber /* = core::double */
   return self::JSNumber|(#this);
 static method main() → void {
-  self::JSArray arr = self::ListToJSArray|get#toJS(core::_GrowableList::_literal2<self::JSAny>(self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")));
+  self::JSArray /* = core::List<self::JSAny? /* = core::Object? */> */ arr = self::ListToJSArray|get#toJS(core::_GrowableList::_literal2<self::JSAny /* = core::Object */>(self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")));
 }
diff --git a/pkg/front_end/testcases/inline_class/issue52119.dart.strong.expect b/pkg/front_end/testcases/inline_class/issue52119.dart.strong.expect
index 30f0ba6f21e..460214f13f7 100644
--- a/pkg/front_end/testcases/inline_class/issue52119.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/issue52119.dart.strong.expect
@@ -37,61 +37,61 @@ extension type Bar<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::Bar|_;
   tearoff _ = self::Bar|_#_#tearOff;
 }
-static inline-class-member method Foo|(core::int i) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|(core::int i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|_(i.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo /* = core::int */
   return self::Foo|(i);
-static inline-class-member method Foo|_(core::int i) → self::Foo {
-  lowered final self::Foo #this = i;
+static inline-class-member method Foo|_(core::int i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Foo|_#_#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#_#tearOff(core::int i) → self::Foo /* = core::int */
   return self::Foo|_(i);
-static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|named(a, subtract: b);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed1(a, b);
-static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final core::int #t1 = b;
   #this = self::Foo|named(a, subtract: #t1);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed2(a, b);
-static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
-  lowered final self::Foo #this = value.{core::num::-}(subtract){(core::num) → core::int};
+static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = value.{core::num::-}(subtract){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
+static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo /* = core::int */
   return self::Foo|named(value, subtract: subtract);
-static inline-class-member method Foo|erroneous() → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|erroneous() → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/issue52119.dart:15:26: Error: Couldn't find constructor 'Foo.unresolved'.
   Foo.erroneous() : this.unresolved();
                          ^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo
+static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo /* = core::int */
   return self::Foo|erroneous();
-static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
-  lowered final self::Bar<self::Bar|::T%> #this;
+static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> /* = self::Bar|::T% */ {
+  lowered final self::Bar<self::Bar|::T%> /* = self::Bar|::T% */ #this;
   #this = self::Bar|_<self::Bar|::T%>(i);
   return #this;
 }
-static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
+static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%> /* = self::Bar|_#new#tearOff::T% */
   return self::Bar|<self::Bar|_#new#tearOff::T%>(i);
-static inline-class-member method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> {
-  lowered final self::Bar<self::Bar|_::T%> #this = i;
+static inline-class-member method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> /* = self::Bar|_::T% */ {
+  lowered final self::Bar<self::Bar|_::T%> /* = self::Bar|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%>
+static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%> /* = self::Bar|_#_#tearOff::T% */
   return self::Bar|_<self::Bar|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(44, self::Foo|(42) as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/issue52119.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/issue52119.dart.strong.transformed.expect
index 30f0ba6f21e..460214f13f7 100644
--- a/pkg/front_end/testcases/inline_class/issue52119.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue52119.dart.strong.transformed.expect
@@ -37,61 +37,61 @@ extension type Bar<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::Bar|_;
   tearoff _ = self::Bar|_#_#tearOff;
 }
-static inline-class-member method Foo|(core::int i) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|(core::int i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|_(i.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo /* = core::int */
   return self::Foo|(i);
-static inline-class-member method Foo|_(core::int i) → self::Foo {
-  lowered final self::Foo #this = i;
+static inline-class-member method Foo|_(core::int i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Foo|_#_#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#_#tearOff(core::int i) → self::Foo /* = core::int */
   return self::Foo|_(i);
-static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|named(a, subtract: b);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed1(a, b);
-static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final core::int #t1 = b;
   #this = self::Foo|named(a, subtract: #t1);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed2(a, b);
-static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
-  lowered final self::Foo #this = value.{core::num::-}(subtract){(core::num) → core::int};
+static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = value.{core::num::-}(subtract){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
+static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo /* = core::int */
   return self::Foo|named(value, subtract: subtract);
-static inline-class-member method Foo|erroneous() → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|erroneous() → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/issue52119.dart:15:26: Error: Couldn't find constructor 'Foo.unresolved'.
   Foo.erroneous() : this.unresolved();
                          ^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo
+static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo /* = core::int */
   return self::Foo|erroneous();
-static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
-  lowered final self::Bar<self::Bar|::T%> #this;
+static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> /* = self::Bar|::T% */ {
+  lowered final self::Bar<self::Bar|::T%> /* = self::Bar|::T% */ #this;
   #this = self::Bar|_<self::Bar|::T%>(i);
   return #this;
 }
-static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
+static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%> /* = self::Bar|_#new#tearOff::T% */
   return self::Bar|<self::Bar|_#new#tearOff::T%>(i);
-static inline-class-member method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> {
-  lowered final self::Bar<self::Bar|_::T%> #this = i;
+static inline-class-member method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> /* = self::Bar|_::T% */ {
+  lowered final self::Bar<self::Bar|_::T%> /* = self::Bar|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%>
+static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%> /* = self::Bar|_#_#tearOff::T% */
   return self::Bar|_<self::Bar|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(44, self::Foo|(42) as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/issue52119.dart.weak.expect b/pkg/front_end/testcases/inline_class/issue52119.dart.weak.expect
index 30f0ba6f21e..460214f13f7 100644
--- a/pkg/front_end/testcases/inline_class/issue52119.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/issue52119.dart.weak.expect
@@ -37,61 +37,61 @@ extension type Bar<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::Bar|_;
   tearoff _ = self::Bar|_#_#tearOff;
 }
-static inline-class-member method Foo|(core::int i) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|(core::int i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|_(i.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo /* = core::int */
   return self::Foo|(i);
-static inline-class-member method Foo|_(core::int i) → self::Foo {
-  lowered final self::Foo #this = i;
+static inline-class-member method Foo|_(core::int i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Foo|_#_#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#_#tearOff(core::int i) → self::Foo /* = core::int */
   return self::Foo|_(i);
-static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|named(a, subtract: b);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed1(a, b);
-static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final core::int #t1 = b;
   #this = self::Foo|named(a, subtract: #t1);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed2(a, b);
-static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
-  lowered final self::Foo #this = value.{core::num::-}(subtract){(core::num) → core::int};
+static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = value.{core::num::-}(subtract){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
+static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo /* = core::int */
   return self::Foo|named(value, subtract: subtract);
-static inline-class-member method Foo|erroneous() → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|erroneous() → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/issue52119.dart:15:26: Error: Couldn't find constructor 'Foo.unresolved'.
   Foo.erroneous() : this.unresolved();
                          ^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo
+static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo /* = core::int */
   return self::Foo|erroneous();
-static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
-  lowered final self::Bar<self::Bar|::T%> #this;
+static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> /* = self::Bar|::T% */ {
+  lowered final self::Bar<self::Bar|::T%> /* = self::Bar|::T% */ #this;
   #this = self::Bar|_<self::Bar|::T%>(i);
   return #this;
 }
-static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
+static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%> /* = self::Bar|_#new#tearOff::T% */
   return self::Bar|<self::Bar|_#new#tearOff::T%>(i);
-static inline-class-member method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> {
-  lowered final self::Bar<self::Bar|_::T%> #this = i;
+static inline-class-member method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> /* = self::Bar|_::T% */ {
+  lowered final self::Bar<self::Bar|_::T%> /* = self::Bar|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%>
+static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%> /* = self::Bar|_#_#tearOff::T% */
   return self::Bar|_<self::Bar|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(44, self::Foo|(42) as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/issue52119.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/issue52119.dart.weak.modular.expect
index 30f0ba6f21e..460214f13f7 100644
--- a/pkg/front_end/testcases/inline_class/issue52119.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/issue52119.dart.weak.modular.expect
@@ -37,61 +37,61 @@ extension type Bar<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::Bar|_;
   tearoff _ = self::Bar|_#_#tearOff;
 }
-static inline-class-member method Foo|(core::int i) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|(core::int i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|_(i.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo /* = core::int */
   return self::Foo|(i);
-static inline-class-member method Foo|_(core::int i) → self::Foo {
-  lowered final self::Foo #this = i;
+static inline-class-member method Foo|_(core::int i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Foo|_#_#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#_#tearOff(core::int i) → self::Foo /* = core::int */
   return self::Foo|_(i);
-static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|named(a, subtract: b);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed1(a, b);
-static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final core::int #t1 = b;
   #this = self::Foo|named(a, subtract: #t1);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed2(a, b);
-static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
-  lowered final self::Foo #this = value.{core::num::-}(subtract){(core::num) → core::int};
+static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = value.{core::num::-}(subtract){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
+static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo /* = core::int */
   return self::Foo|named(value, subtract: subtract);
-static inline-class-member method Foo|erroneous() → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|erroneous() → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/issue52119.dart:15:26: Error: Couldn't find constructor 'Foo.unresolved'.
   Foo.erroneous() : this.unresolved();
                          ^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo
+static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo /* = core::int */
   return self::Foo|erroneous();
-static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
-  lowered final self::Bar<self::Bar|::T%> #this;
+static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> /* = self::Bar|::T% */ {
+  lowered final self::Bar<self::Bar|::T%> /* = self::Bar|::T% */ #this;
   #this = self::Bar|_<self::Bar|::T%>(i);
   return #this;
 }
-static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
+static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%> /* = self::Bar|_#new#tearOff::T% */
   return self::Bar|<self::Bar|_#new#tearOff::T%>(i);
-static inline-class-member method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> {
-  lowered final self::Bar<self::Bar|_::T%> #this = i;
+static inline-class-member method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> /* = self::Bar|_::T% */ {
+  lowered final self::Bar<self::Bar|_::T%> /* = self::Bar|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%>
+static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%> /* = self::Bar|_#_#tearOff::T% */
   return self::Bar|_<self::Bar|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(44, self::Foo|(42) as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/issue52119.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/issue52119.dart.weak.outline.expect
index 8033080678b..27b6182abf8 100644
--- a/pkg/front_end/testcases/inline_class/issue52119.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/issue52119.dart.weak.outline.expect
@@ -22,37 +22,37 @@ extension type Bar<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::Bar|_;
   tearoff _ = self::Bar|_#_#tearOff;
 }
-static inline-class-member method Foo|(core::int i) → self::Foo
+static inline-class-member method Foo|(core::int i) → self::Foo /* = core::int */
   ;
-static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo /* = core::int */
   return self::Foo|(i);
-static inline-class-member method Foo|_(core::int i) → self::Foo
+static inline-class-member method Foo|_(core::int i) → self::Foo /* = core::int */
   ;
-static inline-class-member method Foo|_#_#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#_#tearOff(core::int i) → self::Foo /* = core::int */
   return self::Foo|_(i);
-static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo /* = core::int */
   ;
-static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed1(a, b);
-static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo /* = core::int */
   ;
-static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed2(a, b);
-static inline-class-member method Foo|named(core::int value, {required core::int subtract = null}) → self::Foo
+static inline-class-member method Foo|named(core::int value, {required core::int subtract = null}) → self::Foo /* = core::int */
   ;
-static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
+static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo /* = core::int */
   return self::Foo|named(value, subtract: subtract);
-static inline-class-member method Foo|erroneous() → self::Foo
+static inline-class-member method Foo|erroneous() → self::Foo /* = core::int */
   ;
-static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo
+static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo /* = core::int */
   return self::Foo|erroneous();
-static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%>
+static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> /* = self::Bar|::T% */
   ;
-static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
+static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%> /* = self::Bar|_#new#tearOff::T% */
   return self::Bar|<self::Bar|_#new#tearOff::T%>(i);
-static inline-class-member method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%>
+static inline-class-member method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> /* = self::Bar|_::T% */
   ;
-static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%>
+static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%> /* = self::Bar|_#_#tearOff::T% */
   return self::Bar|_<self::Bar|_#_#tearOff::T%>(i);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/issue52119.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/issue52119.dart.weak.transformed.expect
index 30f0ba6f21e..460214f13f7 100644
--- a/pkg/front_end/testcases/inline_class/issue52119.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue52119.dart.weak.transformed.expect
@@ -37,61 +37,61 @@ extension type Bar<T extends core::Object? = dynamic>(T% i) {
   constructor _ = self::Bar|_;
   tearoff _ = self::Bar|_#_#tearOff;
 }
-static inline-class-member method Foo|(core::int i) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|(core::int i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|_(i.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo /* = core::int */
   return self::Foo|(i);
-static inline-class-member method Foo|_(core::int i) → self::Foo {
-  lowered final self::Foo #this = i;
+static inline-class-member method Foo|_(core::int i) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method Foo|_#_#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#_#tearOff(core::int i) → self::Foo /* = core::int */
   return self::Foo|_(i);
-static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   #this = self::Foo|named(a, subtract: b);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed1(a, b);
-static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final core::int #t1 = b;
   #this = self::Foo|named(a, subtract: #t1);
   return #this;
 }
-static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo /* = core::int */
   return self::Foo|redirectNamed2(a, b);
-static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
-  lowered final self::Foo #this = value.{core::num::-}(subtract){(core::num) → core::int};
+static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this = value.{core::num::-}(subtract){(core::num) → core::int};
   return #this;
 }
-static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
+static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo /* = core::int */
   return self::Foo|named(value, subtract: subtract);
-static inline-class-member method Foo|erroneous() → self::Foo {
-  lowered final self::Foo #this;
+static inline-class-member method Foo|erroneous() → self::Foo /* = core::int */ {
+  lowered final self::Foo /* = core::int */ #this;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/issue52119.dart:15:26: Error: Couldn't find constructor 'Foo.unresolved'.
   Foo.erroneous() : this.unresolved();
                          ^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo
+static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo /* = core::int */
   return self::Foo|erroneous();
-static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
-  lowered final self::Bar<self::Bar|::T%> #this;
+static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> /* = self::Bar|::T% */ {
+  lowered final self::Bar<self::Bar|::T%> /* = self::Bar|::T% */ #this;
   #this = self::Bar|_<self::Bar|::T%>(i);
   return #this;
 }
-static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
+static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%> /* = self::Bar|_#new#tearOff::T% */
   return self::Bar|<self::Bar|_#new#tearOff::T%>(i);
-static inline-class-member method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> {
-  lowered final self::Bar<self::Bar|_::T%> #this = i;
+static inline-class-member method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> /* = self::Bar|_::T% */ {
+  lowered final self::Bar<self::Bar|_::T%> /* = self::Bar|_::T% */ #this = i;
   return #this;
 }
-static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%>
+static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%> /* = self::Bar|_#_#tearOff::T% */
   return self::Bar|_<self::Bar|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(44, self::Foo|(42) as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/issue52240.dart.strong.expect b/pkg/front_end/testcases/inline_class/issue52240.dart.strong.expect
index 61e9888161f..bdec0fb4735 100644
--- a/pkg/front_end/testcases/inline_class/issue52240.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/issue52240.dart.strong.expect
@@ -8,21 +8,21 @@ extension type X(core::int obj) {
   constructor named = self::X|named;
   tearoff named = self::X|_#named#tearOff;
 }
-static inline-class-member method X|() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#new#tearOff() → self::X
+static inline-class-member method X|_#new#tearOff() → self::X /* = core::int */
   return self::X|();
-static inline-class-member method X|named() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|named() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#named#tearOff() → self::X
+static inline-class-member method X|_#named#tearOff() → self::X /* = core::int */
   return self::X|named();
 static method main() → void {
-  core::print(#C1(){() → self::X} as{Unchecked} core::int);
-  core::print(#C2(){() → self::X} as{Unchecked} core::int);
+  core::print(#C1(){() → self::X /* = core::int */} as{Unchecked} core::int);
+  core::print(#C2(){() → self::X /* = core::int */} as{Unchecked} core::int);
 }
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/issue52240.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/issue52240.dart.strong.transformed.expect
index 61e9888161f..bdec0fb4735 100644
--- a/pkg/front_end/testcases/inline_class/issue52240.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue52240.dart.strong.transformed.expect
@@ -8,21 +8,21 @@ extension type X(core::int obj) {
   constructor named = self::X|named;
   tearoff named = self::X|_#named#tearOff;
 }
-static inline-class-member method X|() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#new#tearOff() → self::X
+static inline-class-member method X|_#new#tearOff() → self::X /* = core::int */
   return self::X|();
-static inline-class-member method X|named() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|named() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#named#tearOff() → self::X
+static inline-class-member method X|_#named#tearOff() → self::X /* = core::int */
   return self::X|named();
 static method main() → void {
-  core::print(#C1(){() → self::X} as{Unchecked} core::int);
-  core::print(#C2(){() → self::X} as{Unchecked} core::int);
+  core::print(#C1(){() → self::X /* = core::int */} as{Unchecked} core::int);
+  core::print(#C2(){() → self::X /* = core::int */} as{Unchecked} core::int);
 }
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/issue52240.dart.weak.expect b/pkg/front_end/testcases/inline_class/issue52240.dart.weak.expect
index 61e9888161f..bdec0fb4735 100644
--- a/pkg/front_end/testcases/inline_class/issue52240.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/issue52240.dart.weak.expect
@@ -8,21 +8,21 @@ extension type X(core::int obj) {
   constructor named = self::X|named;
   tearoff named = self::X|_#named#tearOff;
 }
-static inline-class-member method X|() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#new#tearOff() → self::X
+static inline-class-member method X|_#new#tearOff() → self::X /* = core::int */
   return self::X|();
-static inline-class-member method X|named() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|named() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#named#tearOff() → self::X
+static inline-class-member method X|_#named#tearOff() → self::X /* = core::int */
   return self::X|named();
 static method main() → void {
-  core::print(#C1(){() → self::X} as{Unchecked} core::int);
-  core::print(#C2(){() → self::X} as{Unchecked} core::int);
+  core::print(#C1(){() → self::X /* = core::int */} as{Unchecked} core::int);
+  core::print(#C2(){() → self::X /* = core::int */} as{Unchecked} core::int);
 }
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/issue52240.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/issue52240.dart.weak.modular.expect
index 61e9888161f..bdec0fb4735 100644
--- a/pkg/front_end/testcases/inline_class/issue52240.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/issue52240.dart.weak.modular.expect
@@ -8,21 +8,21 @@ extension type X(core::int obj) {
   constructor named = self::X|named;
   tearoff named = self::X|_#named#tearOff;
 }
-static inline-class-member method X|() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#new#tearOff() → self::X
+static inline-class-member method X|_#new#tearOff() → self::X /* = core::int */
   return self::X|();
-static inline-class-member method X|named() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|named() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#named#tearOff() → self::X
+static inline-class-member method X|_#named#tearOff() → self::X /* = core::int */
   return self::X|named();
 static method main() → void {
-  core::print(#C1(){() → self::X} as{Unchecked} core::int);
-  core::print(#C2(){() → self::X} as{Unchecked} core::int);
+  core::print(#C1(){() → self::X /* = core::int */} as{Unchecked} core::int);
+  core::print(#C2(){() → self::X /* = core::int */} as{Unchecked} core::int);
 }
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/issue52240.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/issue52240.dart.weak.outline.expect
index ba49ab802db..417e67ef146 100644
--- a/pkg/front_end/testcases/inline_class/issue52240.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/issue52240.dart.weak.outline.expect
@@ -8,13 +8,13 @@ extension type X(core::int obj) {
   constructor named = self::X|named;
   tearoff named = self::X|_#named#tearOff;
 }
-static inline-class-member method X|() → self::X
+static inline-class-member method X|() → self::X /* = core::int */
   ;
-static inline-class-member method X|_#new#tearOff() → self::X
+static inline-class-member method X|_#new#tearOff() → self::X /* = core::int */
   return self::X|();
-static inline-class-member method X|named() → self::X
+static inline-class-member method X|named() → self::X /* = core::int */
   ;
-static inline-class-member method X|_#named#tearOff() → self::X
+static inline-class-member method X|_#named#tearOff() → self::X /* = core::int */
   return self::X|named();
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/issue52240.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/issue52240.dart.weak.transformed.expect
index 61e9888161f..bdec0fb4735 100644
--- a/pkg/front_end/testcases/inline_class/issue52240.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue52240.dart.weak.transformed.expect
@@ -8,21 +8,21 @@ extension type X(core::int obj) {
   constructor named = self::X|named;
   tearoff named = self::X|_#named#tearOff;
 }
-static inline-class-member method X|() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#new#tearOff() → self::X
+static inline-class-member method X|_#new#tearOff() → self::X /* = core::int */
   return self::X|();
-static inline-class-member method X|named() → self::X {
-  lowered final self::X #this = 0;
+static inline-class-member method X|named() → self::X /* = core::int */ {
+  lowered final self::X /* = core::int */ #this = 0;
   return #this;
 }
-static inline-class-member method X|_#named#tearOff() → self::X
+static inline-class-member method X|_#named#tearOff() → self::X /* = core::int */
   return self::X|named();
 static method main() → void {
-  core::print(#C1(){() → self::X} as{Unchecked} core::int);
-  core::print(#C2(){() → self::X} as{Unchecked} core::int);
+  core::print(#C1(){() → self::X /* = core::int */} as{Unchecked} core::int);
+  core::print(#C2(){() → self::X /* = core::int */} as{Unchecked} core::int);
 }
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/issue52284.dart.strong.expect b/pkg/front_end/testcases/inline_class/issue52284.dart.strong.expect
index 6f7feb70ec5..47e29cc1a57 100644
--- a/pkg/front_end/testcases/inline_class/issue52284.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/issue52284.dart.strong.expect
@@ -14,21 +14,21 @@ extension type Id(core::int _id) {
   constructor • = self::Id|;
   tearoff • = self::Id|_#new#tearOff;
 }
-static inline-class-member method Id|(core::int id) → self::Id {
-  lowered final self::Id #this = id;
+static inline-class-member method Id|(core::int id) → self::Id /* = core::int */ {
+  lowered final self::Id /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method Id|_#new#tearOff(core::int id) → self::Id
+static inline-class-member method Id|_#new#tearOff(core::int id) → self::Id /* = core::int */
   return self::Id|(id);
 static method test() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   core::print(invalid-expression "pkg/front_end/testcases/inline_class/issue52284.dart:12:11: Error: The getter 'unresolved' isn't defined for the class 'Id'.
 Try correcting the name to the name of an existing getter, or defining a getter or field named 'unresolved'.
   print(c.unresolved); // Error
           ^^^^^^^^^^" in c{<unresolved>}.unresolved);
 }
 static method main() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   self::expect(#C1, c.{core::Object::runtimeType}{core::Type});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
diff --git a/pkg/front_end/testcases/inline_class/issue52284.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/issue52284.dart.strong.transformed.expect
index 6f7feb70ec5..47e29cc1a57 100644
--- a/pkg/front_end/testcases/inline_class/issue52284.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue52284.dart.strong.transformed.expect
@@ -14,21 +14,21 @@ extension type Id(core::int _id) {
   constructor • = self::Id|;
   tearoff • = self::Id|_#new#tearOff;
 }
-static inline-class-member method Id|(core::int id) → self::Id {
-  lowered final self::Id #this = id;
+static inline-class-member method Id|(core::int id) → self::Id /* = core::int */ {
+  lowered final self::Id /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method Id|_#new#tearOff(core::int id) → self::Id
+static inline-class-member method Id|_#new#tearOff(core::int id) → self::Id /* = core::int */
   return self::Id|(id);
 static method test() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   core::print(invalid-expression "pkg/front_end/testcases/inline_class/issue52284.dart:12:11: Error: The getter 'unresolved' isn't defined for the class 'Id'.
 Try correcting the name to the name of an existing getter, or defining a getter or field named 'unresolved'.
   print(c.unresolved); // Error
           ^^^^^^^^^^" in c{<unresolved>}.unresolved);
 }
 static method main() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   self::expect(#C1, c.{core::Object::runtimeType}{core::Type});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
diff --git a/pkg/front_end/testcases/inline_class/issue52284.dart.weak.expect b/pkg/front_end/testcases/inline_class/issue52284.dart.weak.expect
index 6f5561bc154..8bf8418250e 100644
--- a/pkg/front_end/testcases/inline_class/issue52284.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/issue52284.dart.weak.expect
@@ -14,21 +14,21 @@ extension type Id(core::int _id) {
   constructor • = self::Id|;
   tearoff • = self::Id|_#new#tearOff;
 }
-static inline-class-member method Id|(core::int id) → self::Id {
-  lowered final self::Id #this = id;
+static inline-class-member method Id|(core::int id) → self::Id /* = core::int */ {
+  lowered final self::Id /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method Id|_#new#tearOff(core::int id) → self::Id
+static inline-class-member method Id|_#new#tearOff(core::int id) → self::Id /* = core::int */
   return self::Id|(id);
 static method test() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   core::print(invalid-expression "pkg/front_end/testcases/inline_class/issue52284.dart:12:11: Error: The getter 'unresolved' isn't defined for the class 'Id'.
 Try correcting the name to the name of an existing getter, or defining a getter or field named 'unresolved'.
   print(c.unresolved); // Error
           ^^^^^^^^^^" in c{<unresolved>}.unresolved);
 }
 static method main() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   self::expect(#C1, c.{core::Object::runtimeType}{core::Type});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
diff --git a/pkg/front_end/testcases/inline_class/issue52284.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/issue52284.dart.weak.modular.expect
index 6f5561bc154..8bf8418250e 100644
--- a/pkg/front_end/testcases/inline_class/issue52284.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/issue52284.dart.weak.modular.expect
@@ -14,21 +14,21 @@ extension type Id(core::int _id) {
   constructor • = self::Id|;
   tearoff • = self::Id|_#new#tearOff;
 }
-static inline-class-member method Id|(core::int id) → self::Id {
-  lowered final self::Id #this = id;
+static inline-class-member method Id|(core::int id) → self::Id /* = core::int */ {
+  lowered final self::Id /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method Id|_#new#tearOff(core::int id) → self::Id
+static inline-class-member method Id|_#new#tearOff(core::int id) → self::Id /* = core::int */
   return self::Id|(id);
 static method test() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   core::print(invalid-expression "pkg/front_end/testcases/inline_class/issue52284.dart:12:11: Error: The getter 'unresolved' isn't defined for the class 'Id'.
 Try correcting the name to the name of an existing getter, or defining a getter or field named 'unresolved'.
   print(c.unresolved); // Error
           ^^^^^^^^^^" in c{<unresolved>}.unresolved);
 }
 static method main() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   self::expect(#C1, c.{core::Object::runtimeType}{core::Type});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
diff --git a/pkg/front_end/testcases/inline_class/issue52284.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/issue52284.dart.weak.outline.expect
index 45f61ee90e0..361639339be 100644
--- a/pkg/front_end/testcases/inline_class/issue52284.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/issue52284.dart.weak.outline.expect
@@ -6,9 +6,9 @@ extension type Id(core::int _id) {
   constructor • = self::Id|;
   tearoff • = self::Id|_#new#tearOff;
 }
-static inline-class-member method Id|(core::int id) → self::Id
+static inline-class-member method Id|(core::int id) → self::Id /* = core::int */
   ;
-static inline-class-member method Id|_#new#tearOff(core::int id) → self::Id
+static inline-class-member method Id|_#new#tearOff(core::int id) → self::Id /* = core::int */
   return self::Id|(id);
 static method test() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/issue52284.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/issue52284.dart.weak.transformed.expect
index 6f5561bc154..8bf8418250e 100644
--- a/pkg/front_end/testcases/inline_class/issue52284.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue52284.dart.weak.transformed.expect
@@ -14,21 +14,21 @@ extension type Id(core::int _id) {
   constructor • = self::Id|;
   tearoff • = self::Id|_#new#tearOff;
 }
-static inline-class-member method Id|(core::int id) → self::Id {
-  lowered final self::Id #this = id;
+static inline-class-member method Id|(core::int id) → self::Id /* = core::int */ {
+  lowered final self::Id /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method Id|_#new#tearOff(core::int id) → self::Id
+static inline-class-member method Id|_#new#tearOff(core::int id) → self::Id /* = core::int */
   return self::Id|(id);
 static method test() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   core::print(invalid-expression "pkg/front_end/testcases/inline_class/issue52284.dart:12:11: Error: The getter 'unresolved' isn't defined for the class 'Id'.
 Try correcting the name to the name of an existing getter, or defining a getter or field named 'unresolved'.
   print(c.unresolved); // Error
           ^^^^^^^^^^" in c{<unresolved>}.unresolved);
 }
 static method main() → dynamic {
-  self::Id c = self::Id|(2);
+  self::Id /* = core::int */ c = self::Id|(2);
   self::expect(#C1, c.{core::Object::runtimeType}{core::Type});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
diff --git a/pkg/front_end/testcases/inline_class/issue52525.dart.strong.expect b/pkg/front_end/testcases/inline_class/issue52525.dart.strong.expect
index 0bb106c9a44..975baeda291 100644
--- a/pkg/front_end/testcases/inline_class/issue52525.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/issue52525.dart.strong.expect
@@ -8,17 +8,17 @@ extension type IC1(core::int id) {
   static redirecting-factory f = self::IC1|f;
   static tearoff f = self::IC1|_#f#tearOff;
 }
-static inline-class-member method IC1|(core::int id) → self::IC1 {
-  lowered final self::IC1 #this = id;
+static inline-class-member method IC1|(core::int id) → self::IC1 /* = core::int */ {
+  lowered final self::IC1 /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method IC1|_#new#tearOff(core::int id) → self::IC1
+static inline-class-member method IC1|_#new#tearOff(core::int id) → self::IC1 /* = core::int */
   return self::IC1|(id);
-static inline-class-member method IC1|f(core::int id) → self::IC1 /* redirection-target: self::IC1| */
+static inline-class-member method IC1|f(core::int id) → self::IC1 /* = core::int */ /* redirection-target: self::IC1| */
   return self::IC1|(id);
-static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1
+static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1 /* = core::int */
   return self::IC1|(id);
 static method main() → dynamic {
-  self::IC1 ic1 = self::IC1|(1);
+  self::IC1 /* = core::int */ ic1 = self::IC1|(1);
   core::print(ic1 as{Unchecked} core::int);
 }
diff --git a/pkg/front_end/testcases/inline_class/issue52525.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/issue52525.dart.strong.transformed.expect
index 0bb106c9a44..975baeda291 100644
--- a/pkg/front_end/testcases/inline_class/issue52525.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue52525.dart.strong.transformed.expect
@@ -8,17 +8,17 @@ extension type IC1(core::int id) {
   static redirecting-factory f = self::IC1|f;
   static tearoff f = self::IC1|_#f#tearOff;
 }
-static inline-class-member method IC1|(core::int id) → self::IC1 {
-  lowered final self::IC1 #this = id;
+static inline-class-member method IC1|(core::int id) → self::IC1 /* = core::int */ {
+  lowered final self::IC1 /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method IC1|_#new#tearOff(core::int id) → self::IC1
+static inline-class-member method IC1|_#new#tearOff(core::int id) → self::IC1 /* = core::int */
   return self::IC1|(id);
-static inline-class-member method IC1|f(core::int id) → self::IC1 /* redirection-target: self::IC1| */
+static inline-class-member method IC1|f(core::int id) → self::IC1 /* = core::int */ /* redirection-target: self::IC1| */
   return self::IC1|(id);
-static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1
+static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1 /* = core::int */
   return self::IC1|(id);
 static method main() → dynamic {
-  self::IC1 ic1 = self::IC1|(1);
+  self::IC1 /* = core::int */ ic1 = self::IC1|(1);
   core::print(ic1 as{Unchecked} core::int);
 }
diff --git a/pkg/front_end/testcases/inline_class/issue52525.dart.weak.expect b/pkg/front_end/testcases/inline_class/issue52525.dart.weak.expect
index 0bb106c9a44..975baeda291 100644
--- a/pkg/front_end/testcases/inline_class/issue52525.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/issue52525.dart.weak.expect
@@ -8,17 +8,17 @@ extension type IC1(core::int id) {
   static redirecting-factory f = self::IC1|f;
   static tearoff f = self::IC1|_#f#tearOff;
 }
-static inline-class-member method IC1|(core::int id) → self::IC1 {
-  lowered final self::IC1 #this = id;
+static inline-class-member method IC1|(core::int id) → self::IC1 /* = core::int */ {
+  lowered final self::IC1 /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method IC1|_#new#tearOff(core::int id) → self::IC1
+static inline-class-member method IC1|_#new#tearOff(core::int id) → self::IC1 /* = core::int */
   return self::IC1|(id);
-static inline-class-member method IC1|f(core::int id) → self::IC1 /* redirection-target: self::IC1| */
+static inline-class-member method IC1|f(core::int id) → self::IC1 /* = core::int */ /* redirection-target: self::IC1| */
   return self::IC1|(id);
-static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1
+static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1 /* = core::int */
   return self::IC1|(id);
 static method main() → dynamic {
-  self::IC1 ic1 = self::IC1|(1);
+  self::IC1 /* = core::int */ ic1 = self::IC1|(1);
   core::print(ic1 as{Unchecked} core::int);
 }
diff --git a/pkg/front_end/testcases/inline_class/issue52525.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/issue52525.dart.weak.modular.expect
index 0bb106c9a44..975baeda291 100644
--- a/pkg/front_end/testcases/inline_class/issue52525.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/issue52525.dart.weak.modular.expect
@@ -8,17 +8,17 @@ extension type IC1(core::int id) {
   static redirecting-factory f = self::IC1|f;
   static tearoff f = self::IC1|_#f#tearOff;
 }
-static inline-class-member method IC1|(core::int id) → self::IC1 {
-  lowered final self::IC1 #this = id;
+static inline-class-member method IC1|(core::int id) → self::IC1 /* = core::int */ {
+  lowered final self::IC1 /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method IC1|_#new#tearOff(core::int id) → self::IC1
+static inline-class-member method IC1|_#new#tearOff(core::int id) → self::IC1 /* = core::int */
   return self::IC1|(id);
-static inline-class-member method IC1|f(core::int id) → self::IC1 /* redirection-target: self::IC1| */
+static inline-class-member method IC1|f(core::int id) → self::IC1 /* = core::int */ /* redirection-target: self::IC1| */
   return self::IC1|(id);
-static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1
+static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1 /* = core::int */
   return self::IC1|(id);
 static method main() → dynamic {
-  self::IC1 ic1 = self::IC1|(1);
+  self::IC1 /* = core::int */ ic1 = self::IC1|(1);
   core::print(ic1 as{Unchecked} core::int);
 }
diff --git a/pkg/front_end/testcases/inline_class/issue52525.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/issue52525.dart.weak.outline.expect
index 81924e44b5b..4c5ebd6fed7 100644
--- a/pkg/front_end/testcases/inline_class/issue52525.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/issue52525.dart.weak.outline.expect
@@ -8,13 +8,13 @@ extension type IC1(core::int id) {
   static redirecting-factory f = self::IC1|f;
   static tearoff f = self::IC1|_#f#tearOff;
 }
-static inline-class-member method IC1|(core::int id) → self::IC1
+static inline-class-member method IC1|(core::int id) → self::IC1 /* = core::int */
   ;
-static inline-class-member method IC1|_#new#tearOff(core::int id) → self::IC1
+static inline-class-member method IC1|_#new#tearOff(core::int id) → self::IC1 /* = core::int */
   return self::IC1|(id);
-static inline-class-member method IC1|f(core::int id) → self::IC1 /* redirection-target: self::IC1| */
+static inline-class-member method IC1|f(core::int id) → self::IC1 /* = core::int */ /* redirection-target: self::IC1| */
   return self::IC1|(id);
-static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1
+static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1 /* = core::int */
   return self::IC1|(id);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/issue52525.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/issue52525.dart.weak.transformed.expect
index 0bb106c9a44..975baeda291 100644
--- a/pkg/front_end/testcases/inline_class/issue52525.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue52525.dart.weak.transformed.expect
@@ -8,17 +8,17 @@ extension type IC1(core::int id) {
   static redirecting-factory f = self::IC1|f;
   static tearoff f = self::IC1|_#f#tearOff;
 }
-static inline-class-member method IC1|(core::int id) → self::IC1 {
-  lowered final self::IC1 #this = id;
+static inline-class-member method IC1|(core::int id) → self::IC1 /* = core::int */ {
+  lowered final self::IC1 /* = core::int */ #this = id;
   return #this;
 }
-static inline-class-member method IC1|_#new#tearOff(core::int id) → self::IC1
+static inline-class-member method IC1|_#new#tearOff(core::int id) → self::IC1 /* = core::int */
   return self::IC1|(id);
-static inline-class-member method IC1|f(core::int id) → self::IC1 /* redirection-target: self::IC1| */
+static inline-class-member method IC1|f(core::int id) → self::IC1 /* = core::int */ /* redirection-target: self::IC1| */
   return self::IC1|(id);
-static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1
+static inline-class-member method IC1|_#f#tearOff(core::int id) → self::IC1 /* = core::int */
   return self::IC1|(id);
 static method main() → dynamic {
-  self::IC1 ic1 = self::IC1|(1);
+  self::IC1 /* = core::int */ ic1 = self::IC1|(1);
   core::print(ic1 as{Unchecked} core::int);
 }
diff --git a/pkg/front_end/testcases/inline_class/issue52667.dart.strong.expect b/pkg/front_end/testcases/inline_class/issue52667.dart.strong.expect
index 4e46db1941c..687f8ce635c 100644
--- a/pkg/front_end/testcases/inline_class/issue52667.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/issue52667.dart.strong.expect
@@ -15,23 +15,23 @@ extension type FooBaz(core::int i) implements self::Foo {
   constructor • = self::FooBaz|;
   tearoff • = self::FooBaz|_#new#tearOff;
 }
-static inline-class-member method FooBar|(core::int i) → self::FooBar {
-  lowered final self::FooBar #this = i;
+static inline-class-member method FooBar|(core::int i) → self::FooBar /* = core::int */ {
+  lowered final self::FooBar /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBar|_#new#tearOff(core::int i) → self::FooBar
+static inline-class-member method FooBar|_#new#tearOff(core::int i) → self::FooBar /* = core::int */
   return self::FooBar|(i);
-static inline-class-member method FooBaz|(core::int i) → self::FooBaz {
-  lowered final self::FooBaz #this = i;
+static inline-class-member method FooBaz|(core::int i) → self::FooBaz /* = core::int */ {
+  lowered final self::FooBaz /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBaz|_#new#tearOff(core::int i) → self::FooBaz
+static inline-class-member method FooBaz|_#new#tearOff(core::int i) → self::FooBaz /* = core::int */
   return self::FooBaz|(i);
 static method main() → void {
-  final self::FooBar a = self::FooBar|(0);
+  final self::FooBar /* = core::int */ a = self::FooBar|(0);
   #L1:
   {
-    final synthesized self::FooBar #0#0 = a;
+    final synthesized self::FooBar /* = core::int */ #0#0 = a;
     {
       final hoisted core::int a;
       if(let final dynamic #t1 = a = #0#0 as{Unchecked} core::int in true) {
diff --git a/pkg/front_end/testcases/inline_class/issue52667.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/issue52667.dart.strong.transformed.expect
index bfbccba6121..b4871f3dfec 100644
--- a/pkg/front_end/testcases/inline_class/issue52667.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue52667.dart.strong.transformed.expect
@@ -15,23 +15,23 @@ extension type FooBaz(core::int i) implements self::Foo {
   constructor • = self::FooBaz|;
   tearoff • = self::FooBaz|_#new#tearOff;
 }
-static inline-class-member method FooBar|(core::int i) → self::FooBar {
-  lowered final self::FooBar #this = i;
+static inline-class-member method FooBar|(core::int i) → self::FooBar /* = core::int */ {
+  lowered final self::FooBar /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBar|_#new#tearOff(core::int i) → self::FooBar
+static inline-class-member method FooBar|_#new#tearOff(core::int i) → self::FooBar /* = core::int */
   return self::FooBar|(i);
-static inline-class-member method FooBaz|(core::int i) → self::FooBaz {
-  lowered final self::FooBaz #this = i;
+static inline-class-member method FooBaz|(core::int i) → self::FooBaz /* = core::int */ {
+  lowered final self::FooBaz /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBaz|_#new#tearOff(core::int i) → self::FooBaz
+static inline-class-member method FooBaz|_#new#tearOff(core::int i) → self::FooBaz /* = core::int */
   return self::FooBaz|(i);
 static method main() → void {
-  final self::FooBar a = self::FooBar|(0);
+  final self::FooBar /* = core::int */ a = self::FooBar|(0);
   #L1:
   {
-    final synthesized self::FooBar #0#0 = a;
+    final synthesized self::FooBar /* = core::int */ #0#0 = a;
     {
       final hoisted core::int a;
       if(let final core::int #t1 = a = #0#0 as{Unchecked} core::int in true) {
diff --git a/pkg/front_end/testcases/inline_class/issue52667.dart.weak.expect b/pkg/front_end/testcases/inline_class/issue52667.dart.weak.expect
index 4e46db1941c..687f8ce635c 100644
--- a/pkg/front_end/testcases/inline_class/issue52667.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/issue52667.dart.weak.expect
@@ -15,23 +15,23 @@ extension type FooBaz(core::int i) implements self::Foo {
   constructor • = self::FooBaz|;
   tearoff • = self::FooBaz|_#new#tearOff;
 }
-static inline-class-member method FooBar|(core::int i) → self::FooBar {
-  lowered final self::FooBar #this = i;
+static inline-class-member method FooBar|(core::int i) → self::FooBar /* = core::int */ {
+  lowered final self::FooBar /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBar|_#new#tearOff(core::int i) → self::FooBar
+static inline-class-member method FooBar|_#new#tearOff(core::int i) → self::FooBar /* = core::int */
   return self::FooBar|(i);
-static inline-class-member method FooBaz|(core::int i) → self::FooBaz {
-  lowered final self::FooBaz #this = i;
+static inline-class-member method FooBaz|(core::int i) → self::FooBaz /* = core::int */ {
+  lowered final self::FooBaz /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBaz|_#new#tearOff(core::int i) → self::FooBaz
+static inline-class-member method FooBaz|_#new#tearOff(core::int i) → self::FooBaz /* = core::int */
   return self::FooBaz|(i);
 static method main() → void {
-  final self::FooBar a = self::FooBar|(0);
+  final self::FooBar /* = core::int */ a = self::FooBar|(0);
   #L1:
   {
-    final synthesized self::FooBar #0#0 = a;
+    final synthesized self::FooBar /* = core::int */ #0#0 = a;
     {
       final hoisted core::int a;
       if(let final dynamic #t1 = a = #0#0 as{Unchecked} core::int in true) {
diff --git a/pkg/front_end/testcases/inline_class/issue52667.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/issue52667.dart.weak.modular.expect
index 4e46db1941c..687f8ce635c 100644
--- a/pkg/front_end/testcases/inline_class/issue52667.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/issue52667.dart.weak.modular.expect
@@ -15,23 +15,23 @@ extension type FooBaz(core::int i) implements self::Foo {
   constructor • = self::FooBaz|;
   tearoff • = self::FooBaz|_#new#tearOff;
 }
-static inline-class-member method FooBar|(core::int i) → self::FooBar {
-  lowered final self::FooBar #this = i;
+static inline-class-member method FooBar|(core::int i) → self::FooBar /* = core::int */ {
+  lowered final self::FooBar /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBar|_#new#tearOff(core::int i) → self::FooBar
+static inline-class-member method FooBar|_#new#tearOff(core::int i) → self::FooBar /* = core::int */
   return self::FooBar|(i);
-static inline-class-member method FooBaz|(core::int i) → self::FooBaz {
-  lowered final self::FooBaz #this = i;
+static inline-class-member method FooBaz|(core::int i) → self::FooBaz /* = core::int */ {
+  lowered final self::FooBaz /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBaz|_#new#tearOff(core::int i) → self::FooBaz
+static inline-class-member method FooBaz|_#new#tearOff(core::int i) → self::FooBaz /* = core::int */
   return self::FooBaz|(i);
 static method main() → void {
-  final self::FooBar a = self::FooBar|(0);
+  final self::FooBar /* = core::int */ a = self::FooBar|(0);
   #L1:
   {
-    final synthesized self::FooBar #0#0 = a;
+    final synthesized self::FooBar /* = core::int */ #0#0 = a;
     {
       final hoisted core::int a;
       if(let final dynamic #t1 = a = #0#0 as{Unchecked} core::int in true) {
diff --git a/pkg/front_end/testcases/inline_class/issue52667.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/issue52667.dart.weak.outline.expect
index 673b13b5ed8..a5e9aedb25e 100644
--- a/pkg/front_end/testcases/inline_class/issue52667.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/issue52667.dart.weak.outline.expect
@@ -14,13 +14,13 @@ extension type FooBaz(core::int i) implements self::Foo {
   constructor • = self::FooBaz|;
   tearoff • = self::FooBaz|_#new#tearOff;
 }
-static inline-class-member method FooBar|(core::int i) → self::FooBar
+static inline-class-member method FooBar|(core::int i) → self::FooBar /* = core::int */
   ;
-static inline-class-member method FooBar|_#new#tearOff(core::int i) → self::FooBar
+static inline-class-member method FooBar|_#new#tearOff(core::int i) → self::FooBar /* = core::int */
   return self::FooBar|(i);
-static inline-class-member method FooBaz|(core::int i) → self::FooBaz
+static inline-class-member method FooBaz|(core::int i) → self::FooBaz /* = core::int */
   ;
-static inline-class-member method FooBaz|_#new#tearOff(core::int i) → self::FooBaz
+static inline-class-member method FooBaz|_#new#tearOff(core::int i) → self::FooBaz /* = core::int */
   return self::FooBaz|(i);
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/issue52667.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/issue52667.dart.weak.transformed.expect
index bfbccba6121..b4871f3dfec 100644
--- a/pkg/front_end/testcases/inline_class/issue52667.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue52667.dart.weak.transformed.expect
@@ -15,23 +15,23 @@ extension type FooBaz(core::int i) implements self::Foo {
   constructor • = self::FooBaz|;
   tearoff • = self::FooBaz|_#new#tearOff;
 }
-static inline-class-member method FooBar|(core::int i) → self::FooBar {
-  lowered final self::FooBar #this = i;
+static inline-class-member method FooBar|(core::int i) → self::FooBar /* = core::int */ {
+  lowered final self::FooBar /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBar|_#new#tearOff(core::int i) → self::FooBar
+static inline-class-member method FooBar|_#new#tearOff(core::int i) → self::FooBar /* = core::int */
   return self::FooBar|(i);
-static inline-class-member method FooBaz|(core::int i) → self::FooBaz {
-  lowered final self::FooBaz #this = i;
+static inline-class-member method FooBaz|(core::int i) → self::FooBaz /* = core::int */ {
+  lowered final self::FooBaz /* = core::int */ #this = i;
   return #this;
 }
-static inline-class-member method FooBaz|_#new#tearOff(core::int i) → self::FooBaz
+static inline-class-member method FooBaz|_#new#tearOff(core::int i) → self::FooBaz /* = core::int */
   return self::FooBaz|(i);
 static method main() → void {
-  final self::FooBar a = self::FooBar|(0);
+  final self::FooBar /* = core::int */ a = self::FooBar|(0);
   #L1:
   {
-    final synthesized self::FooBar #0#0 = a;
+    final synthesized self::FooBar /* = core::int */ #0#0 = a;
     {
       final hoisted core::int a;
       if(let final core::int #t1 = a = #0#0 as{Unchecked} core::int in true) {
diff --git a/pkg/front_end/testcases/inline_class/member_not_found.dart.strong.expect b/pkg/front_end/testcases/inline_class/member_not_found.dart.strong.expect
index c06fcd139a6..462a932e42d 100644
--- a/pkg/front_end/testcases/inline_class/member_not_found.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/member_not_found.dart.strong.expect
@@ -13,11 +13,11 @@ extension type A(core::int value) {
   constructor name1 = self::A|name1;
   tearoff name1 = self::A|_#name1#tearOff;
 }
-static inline-class-member method A|name1(core::int value) → self::A {
-  lowered final self::A #this = value;
+static inline-class-member method A|name1(core::int value) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = value;
   return #this;
 }
-static inline-class-member method A|_#name1#tearOff(core::int value) → self::A
+static inline-class-member method A|_#name1#tearOff(core::int value) → self::A /* = core::int */
   return self::A|name1(value);
 static method method() → void
   return invalid-expression "pkg/front_end/testcases/inline_class/member_not_found.dart:11:20: Error: Member not found: 'A.name2'.
diff --git a/pkg/front_end/testcases/inline_class/member_not_found.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/member_not_found.dart.strong.transformed.expect
index c06fcd139a6..462a932e42d 100644
--- a/pkg/front_end/testcases/inline_class/member_not_found.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/member_not_found.dart.strong.transformed.expect
@@ -13,11 +13,11 @@ extension type A(core::int value) {
   constructor name1 = self::A|name1;
   tearoff name1 = self::A|_#name1#tearOff;
 }
-static inline-class-member method A|name1(core::int value) → self::A {
-  lowered final self::A #this = value;
+static inline-class-member method A|name1(core::int value) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = value;
   return #this;
 }
-static inline-class-member method A|_#name1#tearOff(core::int value) → self::A
+static inline-class-member method A|_#name1#tearOff(core::int value) → self::A /* = core::int */
   return self::A|name1(value);
 static method method() → void
   return invalid-expression "pkg/front_end/testcases/inline_class/member_not_found.dart:11:20: Error: Member not found: 'A.name2'.
diff --git a/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.expect b/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.expect
index c06fcd139a6..462a932e42d 100644
--- a/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.expect
@@ -13,11 +13,11 @@ extension type A(core::int value) {
   constructor name1 = self::A|name1;
   tearoff name1 = self::A|_#name1#tearOff;
 }
-static inline-class-member method A|name1(core::int value) → self::A {
-  lowered final self::A #this = value;
+static inline-class-member method A|name1(core::int value) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = value;
   return #this;
 }
-static inline-class-member method A|_#name1#tearOff(core::int value) → self::A
+static inline-class-member method A|_#name1#tearOff(core::int value) → self::A /* = core::int */
   return self::A|name1(value);
 static method method() → void
   return invalid-expression "pkg/front_end/testcases/inline_class/member_not_found.dart:11:20: Error: Member not found: 'A.name2'.
diff --git a/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.modular.expect
index c06fcd139a6..462a932e42d 100644
--- a/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.modular.expect
@@ -13,11 +13,11 @@ extension type A(core::int value) {
   constructor name1 = self::A|name1;
   tearoff name1 = self::A|_#name1#tearOff;
 }
-static inline-class-member method A|name1(core::int value) → self::A {
-  lowered final self::A #this = value;
+static inline-class-member method A|name1(core::int value) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = value;
   return #this;
 }
-static inline-class-member method A|_#name1#tearOff(core::int value) → self::A
+static inline-class-member method A|_#name1#tearOff(core::int value) → self::A /* = core::int */
   return self::A|name1(value);
 static method method() → void
   return invalid-expression "pkg/front_end/testcases/inline_class/member_not_found.dart:11:20: Error: Member not found: 'A.name2'.
diff --git a/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.outline.expect
index c176f62e34c..9e395b02555 100644
--- a/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.outline.expect
@@ -6,9 +6,9 @@ extension type A(core::int value) {
   constructor name1 = self::A|name1;
   tearoff name1 = self::A|_#name1#tearOff;
 }
-static inline-class-member method A|name1(core::int value) → self::A
+static inline-class-member method A|name1(core::int value) → self::A /* = core::int */
   ;
-static inline-class-member method A|_#name1#tearOff(core::int value) → self::A
+static inline-class-member method A|_#name1#tearOff(core::int value) → self::A /* = core::int */
   return self::A|name1(value);
 static method method() → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.transformed.expect
index c06fcd139a6..462a932e42d 100644
--- a/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.transformed.expect
@@ -13,11 +13,11 @@ extension type A(core::int value) {
   constructor name1 = self::A|name1;
   tearoff name1 = self::A|_#name1#tearOff;
 }
-static inline-class-member method A|name1(core::int value) → self::A {
-  lowered final self::A #this = value;
+static inline-class-member method A|name1(core::int value) → self::A /* = core::int */ {
+  lowered final self::A /* = core::int */ #this = value;
   return #this;
 }
-static inline-class-member method A|_#name1#tearOff(core::int value) → self::A
+static inline-class-member method A|_#name1#tearOff(core::int value) → self::A /* = core::int */
   return self::A|name1(value);
 static method method() → void
   return invalid-expression "pkg/front_end/testcases/inline_class/member_not_found.dart:11:20: Error: Member not found: 'A.name2'.
diff --git a/pkg/front_end/testcases/inline_class/method_access.dart.strong.expect b/pkg/front_end/testcases/inline_class/method_access.dart.strong.expect
index 8e92cb38148..a0f0b7267cf 100644
--- a/pkg/front_end/testcases/inline_class/method_access.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/method_access.dart.strong.expect
@@ -60,13 +60,13 @@ extension type InlineClass(core::int it) {
 static extension-member method _extension#0|get#setter(lowered final core::Object #this) → core::int
   return 42;
 static extension-member method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
-static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → dynamic {
   core::int a = self::InlineClass|+(#this, 2);
   core::int b = self::InlineClass|unary-(#this);
   core::int c = self::InlineClass|[](#this, 2);
@@ -109,35 +109,35 @@ Try correcting the name to the name of an existing setter, or defining a setter
   core::int n1 = self::InlineClass|call(#this);
   core::int n2 = self::InlineClass|call(#this);
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → dynamic
   return () → dynamic => self::InlineClass|test(#this);
-static inline-class-member method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
+static inline-class-member method InlineClass|+(lowered final self::InlineClass /* = core::int */ #this, core::int other) → core::int
   return 42;
-static inline-class-member method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|unary-(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 87;
-static inline-class-member method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
+static inline-class-member method InlineClass|[](lowered final self::InlineClass /* = core::int */ #this, core::int index) → core::int
   return 123;
-static inline-class-member method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
-static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|[]=(lowered final self::InlineClass /* = core::int */ #this, core::int index, core::int value) → void {}
+static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|method(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|method(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#method(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|method(#this);
-static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
-static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
+static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass /* = core::int */ #this, core::int value) → void {}
+static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass /* = core::int */ #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
   return t;
-static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
+static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass /* = core::int */ #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::InlineClass|genericMethod<T%>(#this, t);
-static inline-class-member method InlineClass|call(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|call(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 321;
-static inline-class-member method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#call(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|call(#this);
-static method test(self::InlineClass ic) → dynamic {
+static method test(self::InlineClass /* = core::int */ ic) → dynamic {
   core::int a = self::InlineClass|+(ic, 2);
   core::int b = self::InlineClass|unary-(ic);
   core::int c = self::InlineClass|[](ic, 2);
-  core::int d = let final self::InlineClass #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
+  core::int d = let final self::InlineClass /* = core::int */ #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
   core::int e = self::InlineClass|get#getter(ic);
   () → core::int f = self::InlineClass|get#method(ic);
   core::int g = let final core::int #t12 = 42 in let final void #t13 = self::InlineClass|set#setter(ic, #t12) in #t12;
diff --git a/pkg/front_end/testcases/inline_class/method_access.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/method_access.dart.strong.transformed.expect
index fdab8275823..cc4285ca01e 100644
--- a/pkg/front_end/testcases/inline_class/method_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/method_access.dart.strong.transformed.expect
@@ -60,13 +60,13 @@ extension type InlineClass(core::int it) {
 static extension-member method _extension#0|get#setter(lowered final core::Object #this) → core::int
   return 42;
 static extension-member method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
-static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → dynamic {
   core::int a = self::InlineClass|+(#this, 2);
   core::int b = self::InlineClass|unary-(#this);
   core::int c = self::InlineClass|[](#this, 2);
@@ -109,35 +109,35 @@ Try correcting the name to the name of an existing setter, or defining a setter
   core::int n1 = self::InlineClass|call(#this);
   core::int n2 = self::InlineClass|call(#this);
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → dynamic
   return () → dynamic => self::InlineClass|test(#this);
-static inline-class-member method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
+static inline-class-member method InlineClass|+(lowered final self::InlineClass /* = core::int */ #this, core::int other) → core::int
   return 42;
-static inline-class-member method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|unary-(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 87;
-static inline-class-member method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
+static inline-class-member method InlineClass|[](lowered final self::InlineClass /* = core::int */ #this, core::int index) → core::int
   return 123;
-static inline-class-member method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
-static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|[]=(lowered final self::InlineClass /* = core::int */ #this, core::int index, core::int value) → void {}
+static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|method(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|method(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#method(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|method(#this);
-static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
-static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
+static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass /* = core::int */ #this, core::int value) → void {}
+static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass /* = core::int */ #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
   return t;
-static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
+static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass /* = core::int */ #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::InlineClass|genericMethod<T%>(#this, t);
-static inline-class-member method InlineClass|call(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|call(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 321;
-static inline-class-member method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#call(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|call(#this);
-static method test(self::InlineClass ic) → dynamic {
+static method test(self::InlineClass /* = core::int */ ic) → dynamic {
   core::int a = self::InlineClass|+(ic, 2);
   core::int b = self::InlineClass|unary-(ic);
   core::int c = self::InlineClass|[](ic, 2);
-  core::int d = let final self::InlineClass #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
+  core::int d = let final self::InlineClass /* = core::int */ #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
   core::int e = self::InlineClass|get#getter(ic);
   () → core::int f = self::InlineClass|get#method(ic);
   core::int g = let final core::int #t12 = 42 in let final void #t13 = self::InlineClass|set#setter(ic, #t12) in #t12;
diff --git a/pkg/front_end/testcases/inline_class/method_access.dart.weak.expect b/pkg/front_end/testcases/inline_class/method_access.dart.weak.expect
index 8e92cb38148..a0f0b7267cf 100644
--- a/pkg/front_end/testcases/inline_class/method_access.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/method_access.dart.weak.expect
@@ -60,13 +60,13 @@ extension type InlineClass(core::int it) {
 static extension-member method _extension#0|get#setter(lowered final core::Object #this) → core::int
   return 42;
 static extension-member method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
-static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → dynamic {
   core::int a = self::InlineClass|+(#this, 2);
   core::int b = self::InlineClass|unary-(#this);
   core::int c = self::InlineClass|[](#this, 2);
@@ -109,35 +109,35 @@ Try correcting the name to the name of an existing setter, or defining a setter
   core::int n1 = self::InlineClass|call(#this);
   core::int n2 = self::InlineClass|call(#this);
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → dynamic
   return () → dynamic => self::InlineClass|test(#this);
-static inline-class-member method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
+static inline-class-member method InlineClass|+(lowered final self::InlineClass /* = core::int */ #this, core::int other) → core::int
   return 42;
-static inline-class-member method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|unary-(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 87;
-static inline-class-member method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
+static inline-class-member method InlineClass|[](lowered final self::InlineClass /* = core::int */ #this, core::int index) → core::int
   return 123;
-static inline-class-member method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
-static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|[]=(lowered final self::InlineClass /* = core::int */ #this, core::int index, core::int value) → void {}
+static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|method(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|method(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#method(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|method(#this);
-static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
-static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
+static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass /* = core::int */ #this, core::int value) → void {}
+static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass /* = core::int */ #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
   return t;
-static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
+static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass /* = core::int */ #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::InlineClass|genericMethod<T%>(#this, t);
-static inline-class-member method InlineClass|call(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|call(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 321;
-static inline-class-member method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#call(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|call(#this);
-static method test(self::InlineClass ic) → dynamic {
+static method test(self::InlineClass /* = core::int */ ic) → dynamic {
   core::int a = self::InlineClass|+(ic, 2);
   core::int b = self::InlineClass|unary-(ic);
   core::int c = self::InlineClass|[](ic, 2);
-  core::int d = let final self::InlineClass #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
+  core::int d = let final self::InlineClass /* = core::int */ #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
   core::int e = self::InlineClass|get#getter(ic);
   () → core::int f = self::InlineClass|get#method(ic);
   core::int g = let final core::int #t12 = 42 in let final void #t13 = self::InlineClass|set#setter(ic, #t12) in #t12;
diff --git a/pkg/front_end/testcases/inline_class/method_access.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/method_access.dart.weak.modular.expect
index 8e92cb38148..a0f0b7267cf 100644
--- a/pkg/front_end/testcases/inline_class/method_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/method_access.dart.weak.modular.expect
@@ -60,13 +60,13 @@ extension type InlineClass(core::int it) {
 static extension-member method _extension#0|get#setter(lowered final core::Object #this) → core::int
   return 42;
 static extension-member method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
-static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → dynamic {
   core::int a = self::InlineClass|+(#this, 2);
   core::int b = self::InlineClass|unary-(#this);
   core::int c = self::InlineClass|[](#this, 2);
@@ -109,35 +109,35 @@ Try correcting the name to the name of an existing setter, or defining a setter
   core::int n1 = self::InlineClass|call(#this);
   core::int n2 = self::InlineClass|call(#this);
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → dynamic
   return () → dynamic => self::InlineClass|test(#this);
-static inline-class-member method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
+static inline-class-member method InlineClass|+(lowered final self::InlineClass /* = core::int */ #this, core::int other) → core::int
   return 42;
-static inline-class-member method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|unary-(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 87;
-static inline-class-member method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
+static inline-class-member method InlineClass|[](lowered final self::InlineClass /* = core::int */ #this, core::int index) → core::int
   return 123;
-static inline-class-member method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
-static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|[]=(lowered final self::InlineClass /* = core::int */ #this, core::int index, core::int value) → void {}
+static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|method(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|method(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#method(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|method(#this);
-static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
-static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
+static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass /* = core::int */ #this, core::int value) → void {}
+static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass /* = core::int */ #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
   return t;
-static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
+static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass /* = core::int */ #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::InlineClass|genericMethod<T%>(#this, t);
-static inline-class-member method InlineClass|call(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|call(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 321;
-static inline-class-member method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#call(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|call(#this);
-static method test(self::InlineClass ic) → dynamic {
+static method test(self::InlineClass /* = core::int */ ic) → dynamic {
   core::int a = self::InlineClass|+(ic, 2);
   core::int b = self::InlineClass|unary-(ic);
   core::int c = self::InlineClass|[](ic, 2);
-  core::int d = let final self::InlineClass #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
+  core::int d = let final self::InlineClass /* = core::int */ #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
   core::int e = self::InlineClass|get#getter(ic);
   () → core::int f = self::InlineClass|get#method(ic);
   core::int g = let final core::int #t12 = 42 in let final void #t13 = self::InlineClass|set#setter(ic, #t12) in #t12;
diff --git a/pkg/front_end/testcases/inline_class/method_access.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/method_access.dart.weak.outline.expect
index 9afa2ed27a2..a79ca5a2fa5 100644
--- a/pkg/front_end/testcases/inline_class/method_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/method_access.dart.weak.outline.expect
@@ -28,37 +28,37 @@ static extension-member method _extension#0|get#setter(lowered final core::Objec
   ;
 static extension-member method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void
   ;
-static inline-class-member method InlineClass|(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass /* = core::int */
   ;
-static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → dynamic
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → dynamic
   ;
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → dynamic
   return () → dynamic => self::InlineClass|test(#this);
-static inline-class-member method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
+static inline-class-member method InlineClass|+(lowered final self::InlineClass /* = core::int */ #this, core::int other) → core::int
   ;
-static inline-class-member method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|unary-(lowered final self::InlineClass /* = core::int */ #this) → core::int
   ;
-static inline-class-member method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
+static inline-class-member method InlineClass|[](lowered final self::InlineClass /* = core::int */ #this, core::int index) → core::int
   ;
-static inline-class-member method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void
+static inline-class-member method InlineClass|[]=(lowered final self::InlineClass /* = core::int */ #this, core::int index, core::int value) → void
   ;
-static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass /* = core::int */ #this) → core::int
   ;
-static inline-class-member method InlineClass|method(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|method(lowered final self::InlineClass /* = core::int */ #this) → core::int
   ;
-static inline-class-member method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#method(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|method(#this);
-static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void
+static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass /* = core::int */ #this, core::int value) → void
   ;
-static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
+static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass /* = core::int */ #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
   ;
-static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
+static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass /* = core::int */ #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::InlineClass|genericMethod<T%>(#this, t);
-static inline-class-member method InlineClass|call(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|call(lowered final self::InlineClass /* = core::int */ #this) → core::int
   ;
-static inline-class-member method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#call(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|call(#this);
-static method test(self::InlineClass ic) → dynamic
+static method test(self::InlineClass /* = core::int */ ic) → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/method_access.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/method_access.dart.weak.transformed.expect
index fdab8275823..cc4285ca01e 100644
--- a/pkg/front_end/testcases/inline_class/method_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/method_access.dart.weak.transformed.expect
@@ -60,13 +60,13 @@ extension type InlineClass(core::int it) {
 static extension-member method _extension#0|get#setter(lowered final core::Object #this) → core::int
   return 42;
 static extension-member method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
-static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
-  lowered final self::InlineClass #this = it;
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass /* = core::int */ {
+  lowered final self::InlineClass /* = core::int */ #this = it;
   return #this;
 }
-static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass /* = core::int */
   return self::InlineClass|(it);
-static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass /* = core::int */ #this) → dynamic {
   core::int a = self::InlineClass|+(#this, 2);
   core::int b = self::InlineClass|unary-(#this);
   core::int c = self::InlineClass|[](#this, 2);
@@ -109,35 +109,35 @@ Try correcting the name to the name of an existing setter, or defining a setter
   core::int n1 = self::InlineClass|call(#this);
   core::int n2 = self::InlineClass|call(#this);
 }
-static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass /* = core::int */ #this) → () → dynamic
   return () → dynamic => self::InlineClass|test(#this);
-static inline-class-member method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
+static inline-class-member method InlineClass|+(lowered final self::InlineClass /* = core::int */ #this, core::int other) → core::int
   return 42;
-static inline-class-member method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|unary-(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 87;
-static inline-class-member method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
+static inline-class-member method InlineClass|[](lowered final self::InlineClass /* = core::int */ #this, core::int index) → core::int
   return 123;
-static inline-class-member method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
-static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|[]=(lowered final self::InlineClass /* = core::int */ #this, core::int index, core::int value) → void {}
+static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|method(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|method(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#method(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|method(#this);
-static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
-static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
+static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass /* = core::int */ #this, core::int value) → void {}
+static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass /* = core::int */ #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
   return t;
-static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
+static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass /* = core::int */ #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::InlineClass|genericMethod<T%>(#this, t);
-static inline-class-member method InlineClass|call(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|call(lowered final self::InlineClass /* = core::int */ #this) → core::int
   return 321;
-static inline-class-member method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#call(lowered final self::InlineClass /* = core::int */ #this) → () → core::int
   return () → core::int => self::InlineClass|call(#this);
-static method test(self::InlineClass ic) → dynamic {
+static method test(self::InlineClass /* = core::int */ ic) → dynamic {
   core::int a = self::InlineClass|+(ic, 2);
   core::int b = self::InlineClass|unary-(ic);
   core::int c = self::InlineClass|[](ic, 2);
-  core::int d = let final self::InlineClass #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
+  core::int d = let final self::InlineClass /* = core::int */ #t8 = ic in let final core::int #t9 = 3 in let final core::int #t10 = 42 in let final void #t11 = self::InlineClass|[]=(#t8, #t9, #t10) in #t10;
   core::int e = self::InlineClass|get#getter(ic);
   () → core::int f = self::InlineClass|get#method(ic);
   core::int g = let final core::int #t12 = 42 in let final void #t13 = self::InlineClass|set#setter(ic, #t12) in #t12;
diff --git a/pkg/front_end/testcases/inline_class/procedures.dart.strong.expect b/pkg/front_end/testcases/inline_class/procedures.dart.strong.expect
index 3ad376c0453..631c13efb7b 100644
--- a/pkg/front_end/testcases/inline_class/procedures.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/procedures.dart.strong.expect
@@ -37,29 +37,29 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   static method staticMethod = self::GenericClass|staticMethod;
   static method genericStaticMethod = self::GenericClass|genericStaticMethod;
 }
-static inline-class-member method Class|instanceMethod(lowered final self::Class #this) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod(lowered final self::Class /* = core::int */ #this) → void {
+  self::Class /* = core::int */ local = #this;
   void localM = self::Class|instanceMethod(#this);
   () → void localT = self::Class|get#instanceMethod(#this);
   core::int localG = self::Class|get#instanceGetter(#this);
 }
-static inline-class-member method Class|get#instanceMethod(lowered final self::Class #this) → () → void
+static inline-class-member method Class|get#instanceMethod(lowered final self::Class /* = core::int */ #this) → () → void
   return () → void => self::Class|instanceMethod(#this);
-static inline-class-member method Class|get#instanceGetter(lowered final self::Class #this) → core::int
+static inline-class-member method Class|get#instanceGetter(lowered final self::Class /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod2(lowered final self::Class /* = core::int */ #this, core::String s, [core::int i = #C1]) → void {
+  self::Class /* = core::int */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::Class|genericInstanceMethod<core::String>(#this, s);
   core::int localG2 = self::Class|genericInstanceMethod<core::int>(#this, i);
   core::num localG3 = self::Class|genericInstanceMethod<core::num>(#this, i);
 }
-static inline-class-member method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
+static inline-class-member method Class|get#instanceMethod2(lowered final self::Class /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C1]) → void => self::Class|instanceMethod2(#this, s, i);
-static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
+static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class /* = core::int */ #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
   return s;
-static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class /* = core::int */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::Class|genericInstanceMethod<S%>(#this, s);
 static inline-class-member method Class|staticMethod() → void {
   self::Class|staticMethod();
@@ -69,29 +69,29 @@ static inline-class-member method Class|staticMethod() → void {
 }
 static inline-class-member method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
   return s;
-static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
-  self::GenericClass<self::GenericClass|instanceMethod::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ #this) → void {
+  self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ local = #this;
   void localM = self::GenericClass|instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   () → void localT = self::GenericClass|get#instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   self::GenericClass|instanceMethod::T% localG = self::GenericClass|get#instanceGetter<self::GenericClass|instanceMethod::T%>(#this);
 }
-static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
+static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> /* = self::GenericClass|get#instanceMethod::T% */ #this) → () → void
   return () → void => self::GenericClass|instanceMethod<self::GenericClass|get#instanceMethod::T%>(#this);
-static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
+static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> /* = self::GenericClass|get#instanceGetter::T% */ #this) → self::GenericClass|get#instanceGetter::T%
   return throw "";
-static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
-  self::GenericClass<self::GenericClass|instanceMethod2::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ #this, core::String s, {core::int i = #C1}) → void {
+  self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::String>(#this, s);
   core::int localG2 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::int>(#this, i);
   core::num localG3 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::num>(#this, i);
 }
-static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
+static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> /* = self::GenericClass|get#instanceMethod2::T% */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C1}) → void => self::GenericClass|instanceMethod2<self::GenericClass|get#instanceMethod2::T%>(#this, s, i: i);
-static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
+static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> /* = self::GenericClass|genericInstanceMethod::T% */ #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
   return s;
-static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> /* = self::GenericClass|get#genericInstanceMethod::T% */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::GenericClass|genericInstanceMethod<self::GenericClass|get#genericInstanceMethod::T%, S%>(#this, s);
 static inline-class-member method GenericClass|staticMethod() → void {
   self::GenericClass|staticMethod();
diff --git a/pkg/front_end/testcases/inline_class/procedures.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/procedures.dart.strong.transformed.expect
index 3ad376c0453..631c13efb7b 100644
--- a/pkg/front_end/testcases/inline_class/procedures.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/procedures.dart.strong.transformed.expect
@@ -37,29 +37,29 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   static method staticMethod = self::GenericClass|staticMethod;
   static method genericStaticMethod = self::GenericClass|genericStaticMethod;
 }
-static inline-class-member method Class|instanceMethod(lowered final self::Class #this) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod(lowered final self::Class /* = core::int */ #this) → void {
+  self::Class /* = core::int */ local = #this;
   void localM = self::Class|instanceMethod(#this);
   () → void localT = self::Class|get#instanceMethod(#this);
   core::int localG = self::Class|get#instanceGetter(#this);
 }
-static inline-class-member method Class|get#instanceMethod(lowered final self::Class #this) → () → void
+static inline-class-member method Class|get#instanceMethod(lowered final self::Class /* = core::int */ #this) → () → void
   return () → void => self::Class|instanceMethod(#this);
-static inline-class-member method Class|get#instanceGetter(lowered final self::Class #this) → core::int
+static inline-class-member method Class|get#instanceGetter(lowered final self::Class /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod2(lowered final self::Class /* = core::int */ #this, core::String s, [core::int i = #C1]) → void {
+  self::Class /* = core::int */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::Class|genericInstanceMethod<core::String>(#this, s);
   core::int localG2 = self::Class|genericInstanceMethod<core::int>(#this, i);
   core::num localG3 = self::Class|genericInstanceMethod<core::num>(#this, i);
 }
-static inline-class-member method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
+static inline-class-member method Class|get#instanceMethod2(lowered final self::Class /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C1]) → void => self::Class|instanceMethod2(#this, s, i);
-static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
+static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class /* = core::int */ #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
   return s;
-static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class /* = core::int */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::Class|genericInstanceMethod<S%>(#this, s);
 static inline-class-member method Class|staticMethod() → void {
   self::Class|staticMethod();
@@ -69,29 +69,29 @@ static inline-class-member method Class|staticMethod() → void {
 }
 static inline-class-member method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
   return s;
-static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
-  self::GenericClass<self::GenericClass|instanceMethod::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ #this) → void {
+  self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ local = #this;
   void localM = self::GenericClass|instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   () → void localT = self::GenericClass|get#instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   self::GenericClass|instanceMethod::T% localG = self::GenericClass|get#instanceGetter<self::GenericClass|instanceMethod::T%>(#this);
 }
-static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
+static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> /* = self::GenericClass|get#instanceMethod::T% */ #this) → () → void
   return () → void => self::GenericClass|instanceMethod<self::GenericClass|get#instanceMethod::T%>(#this);
-static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
+static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> /* = self::GenericClass|get#instanceGetter::T% */ #this) → self::GenericClass|get#instanceGetter::T%
   return throw "";
-static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
-  self::GenericClass<self::GenericClass|instanceMethod2::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ #this, core::String s, {core::int i = #C1}) → void {
+  self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::String>(#this, s);
   core::int localG2 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::int>(#this, i);
   core::num localG3 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::num>(#this, i);
 }
-static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
+static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> /* = self::GenericClass|get#instanceMethod2::T% */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C1}) → void => self::GenericClass|instanceMethod2<self::GenericClass|get#instanceMethod2::T%>(#this, s, i: i);
-static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
+static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> /* = self::GenericClass|genericInstanceMethod::T% */ #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
   return s;
-static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> /* = self::GenericClass|get#genericInstanceMethod::T% */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::GenericClass|genericInstanceMethod<self::GenericClass|get#genericInstanceMethod::T%, S%>(#this, s);
 static inline-class-member method GenericClass|staticMethod() → void {
   self::GenericClass|staticMethod();
diff --git a/pkg/front_end/testcases/inline_class/procedures.dart.weak.expect b/pkg/front_end/testcases/inline_class/procedures.dart.weak.expect
index 3ad376c0453..631c13efb7b 100644
--- a/pkg/front_end/testcases/inline_class/procedures.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/procedures.dart.weak.expect
@@ -37,29 +37,29 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   static method staticMethod = self::GenericClass|staticMethod;
   static method genericStaticMethod = self::GenericClass|genericStaticMethod;
 }
-static inline-class-member method Class|instanceMethod(lowered final self::Class #this) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod(lowered final self::Class /* = core::int */ #this) → void {
+  self::Class /* = core::int */ local = #this;
   void localM = self::Class|instanceMethod(#this);
   () → void localT = self::Class|get#instanceMethod(#this);
   core::int localG = self::Class|get#instanceGetter(#this);
 }
-static inline-class-member method Class|get#instanceMethod(lowered final self::Class #this) → () → void
+static inline-class-member method Class|get#instanceMethod(lowered final self::Class /* = core::int */ #this) → () → void
   return () → void => self::Class|instanceMethod(#this);
-static inline-class-member method Class|get#instanceGetter(lowered final self::Class #this) → core::int
+static inline-class-member method Class|get#instanceGetter(lowered final self::Class /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod2(lowered final self::Class /* = core::int */ #this, core::String s, [core::int i = #C1]) → void {
+  self::Class /* = core::int */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::Class|genericInstanceMethod<core::String>(#this, s);
   core::int localG2 = self::Class|genericInstanceMethod<core::int>(#this, i);
   core::num localG3 = self::Class|genericInstanceMethod<core::num>(#this, i);
 }
-static inline-class-member method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
+static inline-class-member method Class|get#instanceMethod2(lowered final self::Class /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C1]) → void => self::Class|instanceMethod2(#this, s, i);
-static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
+static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class /* = core::int */ #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
   return s;
-static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class /* = core::int */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::Class|genericInstanceMethod<S%>(#this, s);
 static inline-class-member method Class|staticMethod() → void {
   self::Class|staticMethod();
@@ -69,29 +69,29 @@ static inline-class-member method Class|staticMethod() → void {
 }
 static inline-class-member method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
   return s;
-static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
-  self::GenericClass<self::GenericClass|instanceMethod::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ #this) → void {
+  self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ local = #this;
   void localM = self::GenericClass|instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   () → void localT = self::GenericClass|get#instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   self::GenericClass|instanceMethod::T% localG = self::GenericClass|get#instanceGetter<self::GenericClass|instanceMethod::T%>(#this);
 }
-static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
+static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> /* = self::GenericClass|get#instanceMethod::T% */ #this) → () → void
   return () → void => self::GenericClass|instanceMethod<self::GenericClass|get#instanceMethod::T%>(#this);
-static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
+static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> /* = self::GenericClass|get#instanceGetter::T% */ #this) → self::GenericClass|get#instanceGetter::T%
   return throw "";
-static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
-  self::GenericClass<self::GenericClass|instanceMethod2::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ #this, core::String s, {core::int i = #C1}) → void {
+  self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::String>(#this, s);
   core::int localG2 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::int>(#this, i);
   core::num localG3 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::num>(#this, i);
 }
-static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
+static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> /* = self::GenericClass|get#instanceMethod2::T% */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C1}) → void => self::GenericClass|instanceMethod2<self::GenericClass|get#instanceMethod2::T%>(#this, s, i: i);
-static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
+static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> /* = self::GenericClass|genericInstanceMethod::T% */ #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
   return s;
-static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> /* = self::GenericClass|get#genericInstanceMethod::T% */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::GenericClass|genericInstanceMethod<self::GenericClass|get#genericInstanceMethod::T%, S%>(#this, s);
 static inline-class-member method GenericClass|staticMethod() → void {
   self::GenericClass|staticMethod();
diff --git a/pkg/front_end/testcases/inline_class/procedures.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/procedures.dart.weak.modular.expect
index 3ad376c0453..631c13efb7b 100644
--- a/pkg/front_end/testcases/inline_class/procedures.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/procedures.dart.weak.modular.expect
@@ -37,29 +37,29 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   static method staticMethod = self::GenericClass|staticMethod;
   static method genericStaticMethod = self::GenericClass|genericStaticMethod;
 }
-static inline-class-member method Class|instanceMethod(lowered final self::Class #this) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod(lowered final self::Class /* = core::int */ #this) → void {
+  self::Class /* = core::int */ local = #this;
   void localM = self::Class|instanceMethod(#this);
   () → void localT = self::Class|get#instanceMethod(#this);
   core::int localG = self::Class|get#instanceGetter(#this);
 }
-static inline-class-member method Class|get#instanceMethod(lowered final self::Class #this) → () → void
+static inline-class-member method Class|get#instanceMethod(lowered final self::Class /* = core::int */ #this) → () → void
   return () → void => self::Class|instanceMethod(#this);
-static inline-class-member method Class|get#instanceGetter(lowered final self::Class #this) → core::int
+static inline-class-member method Class|get#instanceGetter(lowered final self::Class /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod2(lowered final self::Class /* = core::int */ #this, core::String s, [core::int i = #C1]) → void {
+  self::Class /* = core::int */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::Class|genericInstanceMethod<core::String>(#this, s);
   core::int localG2 = self::Class|genericInstanceMethod<core::int>(#this, i);
   core::num localG3 = self::Class|genericInstanceMethod<core::num>(#this, i);
 }
-static inline-class-member method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
+static inline-class-member method Class|get#instanceMethod2(lowered final self::Class /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C1]) → void => self::Class|instanceMethod2(#this, s, i);
-static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
+static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class /* = core::int */ #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
   return s;
-static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class /* = core::int */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::Class|genericInstanceMethod<S%>(#this, s);
 static inline-class-member method Class|staticMethod() → void {
   self::Class|staticMethod();
@@ -69,29 +69,29 @@ static inline-class-member method Class|staticMethod() → void {
 }
 static inline-class-member method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
   return s;
-static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
-  self::GenericClass<self::GenericClass|instanceMethod::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ #this) → void {
+  self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ local = #this;
   void localM = self::GenericClass|instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   () → void localT = self::GenericClass|get#instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   self::GenericClass|instanceMethod::T% localG = self::GenericClass|get#instanceGetter<self::GenericClass|instanceMethod::T%>(#this);
 }
-static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
+static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> /* = self::GenericClass|get#instanceMethod::T% */ #this) → () → void
   return () → void => self::GenericClass|instanceMethod<self::GenericClass|get#instanceMethod::T%>(#this);
-static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
+static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> /* = self::GenericClass|get#instanceGetter::T% */ #this) → self::GenericClass|get#instanceGetter::T%
   return throw "";
-static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
-  self::GenericClass<self::GenericClass|instanceMethod2::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ #this, core::String s, {core::int i = #C1}) → void {
+  self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::String>(#this, s);
   core::int localG2 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::int>(#this, i);
   core::num localG3 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::num>(#this, i);
 }
-static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
+static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> /* = self::GenericClass|get#instanceMethod2::T% */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C1}) → void => self::GenericClass|instanceMethod2<self::GenericClass|get#instanceMethod2::T%>(#this, s, i: i);
-static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
+static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> /* = self::GenericClass|genericInstanceMethod::T% */ #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
   return s;
-static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> /* = self::GenericClass|get#genericInstanceMethod::T% */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::GenericClass|genericInstanceMethod<self::GenericClass|get#genericInstanceMethod::T%, S%>(#this, s);
 static inline-class-member method GenericClass|staticMethod() → void {
   self::GenericClass|staticMethod();
diff --git a/pkg/front_end/testcases/inline_class/procedures.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/procedures.dart.weak.outline.expect
index 0459397fcc5..e48188a84f3 100644
--- a/pkg/front_end/testcases/inline_class/procedures.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/procedures.dart.weak.outline.expect
@@ -24,37 +24,37 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   static method staticMethod = self::GenericClass|staticMethod;
   static method genericStaticMethod = self::GenericClass|genericStaticMethod;
 }
-static inline-class-member method Class|instanceMethod(lowered final self::Class #this) → void
+static inline-class-member method Class|instanceMethod(lowered final self::Class /* = core::int */ #this) → void
   ;
-static inline-class-member method Class|get#instanceMethod(lowered final self::Class #this) → () → void
+static inline-class-member method Class|get#instanceMethod(lowered final self::Class /* = core::int */ #this) → () → void
   return () → void => self::Class|instanceMethod(#this);
-static inline-class-member method Class|get#instanceGetter(lowered final self::Class #this) → core::int
+static inline-class-member method Class|get#instanceGetter(lowered final self::Class /* = core::int */ #this) → core::int
   ;
-static inline-class-member method Class|instanceMethod2(lowered final self::Class #this, core::String s, [has-declared-initializer core::int i]) → void
+static inline-class-member method Class|instanceMethod2(lowered final self::Class /* = core::int */ #this, core::String s, [has-declared-initializer core::int i]) → void
   ;
-static inline-class-member method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
+static inline-class-member method Class|get#instanceMethod2(lowered final self::Class /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i]) → void => self::Class|instanceMethod2(#this, s, i);
-static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
+static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class /* = core::int */ #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
   ;
-static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class /* = core::int */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::Class|genericInstanceMethod<S%>(#this, s);
 static inline-class-member method Class|staticMethod() → void
   ;
 static inline-class-member method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
   ;
-static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void
+static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ #this) → void
   ;
-static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
+static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> /* = self::GenericClass|get#instanceMethod::T% */ #this) → () → void
   return () → void => self::GenericClass|instanceMethod<self::GenericClass|get#instanceMethod::T%>(#this);
-static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
+static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> /* = self::GenericClass|get#instanceGetter::T% */ #this) → self::GenericClass|get#instanceGetter::T%
   ;
-static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {has-declared-initializer core::int i}) → void
+static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ #this, core::String s, {has-declared-initializer core::int i}) → void
   ;
-static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
+static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> /* = self::GenericClass|get#instanceMethod2::T% */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i}) → void => self::GenericClass|instanceMethod2<self::GenericClass|get#instanceMethod2::T%>(#this, s, i: i);
-static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
+static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> /* = self::GenericClass|genericInstanceMethod::T% */ #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
   ;
-static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> /* = self::GenericClass|get#genericInstanceMethod::T% */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::GenericClass|genericInstanceMethod<self::GenericClass|get#genericInstanceMethod::T%, S%>(#this, s);
 static inline-class-member method GenericClass|staticMethod() → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/procedures.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/procedures.dart.weak.transformed.expect
index 3ad376c0453..631c13efb7b 100644
--- a/pkg/front_end/testcases/inline_class/procedures.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/procedures.dart.weak.transformed.expect
@@ -37,29 +37,29 @@ extension type GenericClass<T extends core::Object? = dynamic>(T% it) {
   static method staticMethod = self::GenericClass|staticMethod;
   static method genericStaticMethod = self::GenericClass|genericStaticMethod;
 }
-static inline-class-member method Class|instanceMethod(lowered final self::Class #this) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod(lowered final self::Class /* = core::int */ #this) → void {
+  self::Class /* = core::int */ local = #this;
   void localM = self::Class|instanceMethod(#this);
   () → void localT = self::Class|get#instanceMethod(#this);
   core::int localG = self::Class|get#instanceGetter(#this);
 }
-static inline-class-member method Class|get#instanceMethod(lowered final self::Class #this) → () → void
+static inline-class-member method Class|get#instanceMethod(lowered final self::Class /* = core::int */ #this) → () → void
   return () → void => self::Class|instanceMethod(#this);
-static inline-class-member method Class|get#instanceGetter(lowered final self::Class #this) → core::int
+static inline-class-member method Class|get#instanceGetter(lowered final self::Class /* = core::int */ #this) → core::int
   return 42;
-static inline-class-member method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
-  self::Class local = #this;
+static inline-class-member method Class|instanceMethod2(lowered final self::Class /* = core::int */ #this, core::String s, [core::int i = #C1]) → void {
+  self::Class /* = core::int */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::Class|genericInstanceMethod<core::String>(#this, s);
   core::int localG2 = self::Class|genericInstanceMethod<core::int>(#this, i);
   core::num localG3 = self::Class|genericInstanceMethod<core::num>(#this, i);
 }
-static inline-class-member method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
+static inline-class-member method Class|get#instanceMethod2(lowered final self::Class /* = core::int */ #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C1]) → void => self::Class|instanceMethod2(#this, s, i);
-static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
+static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class /* = core::int */ #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
   return s;
-static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class /* = core::int */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::Class|genericInstanceMethod<S%>(#this, s);
 static inline-class-member method Class|staticMethod() → void {
   self::Class|staticMethod();
@@ -69,29 +69,29 @@ static inline-class-member method Class|staticMethod() → void {
 }
 static inline-class-member method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
   return s;
-static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
-  self::GenericClass<self::GenericClass|instanceMethod::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ #this) → void {
+  self::GenericClass<self::GenericClass|instanceMethod::T%> /* = self::GenericClass|instanceMethod::T% */ local = #this;
   void localM = self::GenericClass|instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   () → void localT = self::GenericClass|get#instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   self::GenericClass|instanceMethod::T% localG = self::GenericClass|get#instanceGetter<self::GenericClass|instanceMethod::T%>(#this);
 }
-static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
+static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> /* = self::GenericClass|get#instanceMethod::T% */ #this) → () → void
   return () → void => self::GenericClass|instanceMethod<self::GenericClass|get#instanceMethod::T%>(#this);
-static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
+static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> /* = self::GenericClass|get#instanceGetter::T% */ #this) → self::GenericClass|get#instanceGetter::T%
   return throw "";
-static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
-  self::GenericClass<self::GenericClass|instanceMethod2::T%> local = #this;
+static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ #this, core::String s, {core::int i = #C1}) → void {
+  self::GenericClass<self::GenericClass|instanceMethod2::T%> /* = self::GenericClass|instanceMethod2::T% */ local = #this;
   core::String localS = s;
   core::int localI = i;
   core::String localG1 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::String>(#this, s);
   core::int localG2 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::int>(#this, i);
   core::num localG3 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::num>(#this, i);
 }
-static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
+static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> /* = self::GenericClass|get#instanceMethod2::T% */ #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C1}) → void => self::GenericClass|instanceMethod2<self::GenericClass|get#instanceMethod2::T%>(#this, s, i: i);
-static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
+static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> /* = self::GenericClass|genericInstanceMethod::T% */ #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
   return s;
-static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> /* = self::GenericClass|get#genericInstanceMethod::T% */ #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::GenericClass|genericInstanceMethod<self::GenericClass|get#genericInstanceMethod::T%, S%>(#this, s);
 static inline-class-member method GenericClass|staticMethod() → void {
   self::GenericClass|staticMethod();
diff --git a/pkg/front_end/testcases/inline_class/representation.dart.strong.expect b/pkg/front_end/testcases/inline_class/representation.dart.strong.expect
index 80d79fd9c19..a26545d13c7 100644
--- a/pkg/front_end/testcases/inline_class/representation.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/representation.dart.strong.expect
@@ -42,24 +42,24 @@ extension type Duplicate(core::bool instanceField) {
   tearoff • = self::Duplicate|_#new#tearOff;
 }
 static field core::int Static|staticField = 42;
-static inline-class-member method Static|(core::bool instanceField) → self::Static {
-  lowered final self::Static #this = instanceField;
+static inline-class-member method Static|(core::bool instanceField) → self::Static /* = core::bool */ {
+  lowered final self::Static /* = core::bool */ #this = instanceField;
   return #this;
 }
-static inline-class-member method Static|_#new#tearOff(core::bool instanceField) → self::Static
+static inline-class-member method Static|_#new#tearOff(core::bool instanceField) → self::Static /* = core::bool */
   return self::Static|(instanceField);
-static inline-class-member method Multiple|(core::bool instanceField1) → self::Multiple {
-  lowered final self::Multiple #this = instanceField1;
+static inline-class-member method Multiple|(core::bool instanceField1) → self::Multiple /* = core::bool */ {
+  lowered final self::Multiple /* = core::bool */ #this = instanceField1;
   return #this;
 }
-static inline-class-member method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple
+static inline-class-member method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple /* = core::bool */
   return self::Multiple|(instanceField1);
-static inline-class-member method Duplicate|(core::int instanceField) → self::Duplicate {
-  lowered final self::Duplicate #this;
+static inline-class-member method Duplicate|(core::int instanceField) → self::Duplicate /* = core::bool */ {
+  lowered final self::Duplicate /* = core::bool */ #this;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/representation.dart:25:18: Error: Can't use 'instanceField' because it is declared more than once.
   Duplicate(this.instanceField);
                  ^^^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate
+static inline-class-member method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate /* = core::bool */
   return self::Duplicate|(instanceField);
diff --git a/pkg/front_end/testcases/inline_class/representation.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/representation.dart.strong.transformed.expect
index 80d79fd9c19..a26545d13c7 100644
--- a/pkg/front_end/testcases/inline_class/representation.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/representation.dart.strong.transformed.expect
@@ -42,24 +42,24 @@ extension type Duplicate(core::bool instanceField) {
   tearoff • = self::Duplicate|_#new#tearOff;
 }
 static field core::int Static|staticField = 42;
-static inline-class-member method Static|(core::bool instanceField) → self::Static {
-  lowered final self::Static #this = instanceField;
+static inline-class-member method Static|(core::bool instanceField) → self::Static /* = core::bool */ {
+  lowered final self::Static /* = core::bool */ #this = instanceField;
   return #this;
 }
-static inline-class-member method Static|_#new#tearOff(core::bool instanceField) → self::Static
+static inline-class-member method Static|_#new#tearOff(core::bool instanceField) → self::Static /* = core::bool */
   return self::Static|(instanceField);
-static inline-class-member method Multiple|(core::bool instanceField1) → self::Multiple {
-  lowered final self::Multiple #this = instanceField1;
+static inline-class-member method Multiple|(core::bool instanceField1) → self::Multiple /* = core::bool */ {
+  lowered final self::Multiple /* = core::bool */ #this = instanceField1;
   return #this;
 }
-static inline-class-member method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple
+static inline-class-member method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple /* = core::bool */
   return self::Multiple|(instanceField1);
-static inline-class-member method Duplicate|(core::int instanceField) → self::Duplicate {
-  lowered final self::Duplicate #this;
+static inline-class-member method Duplicate|(core::int instanceField) → self::Duplicate /* = core::bool */ {
+  lowered final self::Duplicate /* = core::bool */ #this;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/representation.dart:25:18: Error: Can't use 'instanceField' because it is declared more than once.
   Duplicate(this.instanceField);
                  ^^^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate
+static inline-class-member method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate /* = core::bool */
   return self::Duplicate|(instanceField);
diff --git a/pkg/front_end/testcases/inline_class/representation.dart.weak.expect b/pkg/front_end/testcases/inline_class/representation.dart.weak.expect
index 80d79fd9c19..a26545d13c7 100644
--- a/pkg/front_end/testcases/inline_class/representation.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/representation.dart.weak.expect
@@ -42,24 +42,24 @@ extension type Duplicate(core::bool instanceField) {
   tearoff • = self::Duplicate|_#new#tearOff;
 }
 static field core::int Static|staticField = 42;
-static inline-class-member method Static|(core::bool instanceField) → self::Static {
-  lowered final self::Static #this = instanceField;
+static inline-class-member method Static|(core::bool instanceField) → self::Static /* = core::bool */ {
+  lowered final self::Static /* = core::bool */ #this = instanceField;
   return #this;
 }
-static inline-class-member method Static|_#new#tearOff(core::bool instanceField) → self::Static
+static inline-class-member method Static|_#new#tearOff(core::bool instanceField) → self::Static /* = core::bool */
   return self::Static|(instanceField);
-static inline-class-member method Multiple|(core::bool instanceField1) → self::Multiple {
-  lowered final self::Multiple #this = instanceField1;
+static inline-class-member method Multiple|(core::bool instanceField1) → self::Multiple /* = core::bool */ {
+  lowered final self::Multiple /* = core::bool */ #this = instanceField1;
   return #this;
 }
-static inline-class-member method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple
+static inline-class-member method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple /* = core::bool */
   return self::Multiple|(instanceField1);
-static inline-class-member method Duplicate|(core::int instanceField) → self::Duplicate {
-  lowered final self::Duplicate #this;
+static inline-class-member method Duplicate|(core::int instanceField) → self::Duplicate /* = core::bool */ {
+  lowered final self::Duplicate /* = core::bool */ #this;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/representation.dart:25:18: Error: Can't use 'instanceField' because it is declared more than once.
   Duplicate(this.instanceField);
                  ^^^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate
+static inline-class-member method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate /* = core::bool */
   return self::Duplicate|(instanceField);
diff --git a/pkg/front_end/testcases/inline_class/representation.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/representation.dart.weak.modular.expect
index 80d79fd9c19..a26545d13c7 100644
--- a/pkg/front_end/testcases/inline_class/representation.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/representation.dart.weak.modular.expect
@@ -42,24 +42,24 @@ extension type Duplicate(core::bool instanceField) {
   tearoff • = self::Duplicate|_#new#tearOff;
 }
 static field core::int Static|staticField = 42;
-static inline-class-member method Static|(core::bool instanceField) → self::Static {
-  lowered final self::Static #this = instanceField;
+static inline-class-member method Static|(core::bool instanceField) → self::Static /* = core::bool */ {
+  lowered final self::Static /* = core::bool */ #this = instanceField;
   return #this;
 }
-static inline-class-member method Static|_#new#tearOff(core::bool instanceField) → self::Static
+static inline-class-member method Static|_#new#tearOff(core::bool instanceField) → self::Static /* = core::bool */
   return self::Static|(instanceField);
-static inline-class-member method Multiple|(core::bool instanceField1) → self::Multiple {
-  lowered final self::Multiple #this = instanceField1;
+static inline-class-member method Multiple|(core::bool instanceField1) → self::Multiple /* = core::bool */ {
+  lowered final self::Multiple /* = core::bool */ #this = instanceField1;
   return #this;
 }
-static inline-class-member method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple
+static inline-class-member method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple /* = core::bool */
   return self::Multiple|(instanceField1);
-static inline-class-member method Duplicate|(core::int instanceField) → self::Duplicate {
-  lowered final self::Duplicate #this;
+static inline-class-member method Duplicate|(core::int instanceField) → self::Duplicate /* = core::bool */ {
+  lowered final self::Duplicate /* = core::bool */ #this;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/representation.dart:25:18: Error: Can't use 'instanceField' because it is declared more than once.
   Duplicate(this.instanceField);
                  ^^^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate
+static inline-class-member method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate /* = core::bool */
   return self::Duplicate|(instanceField);
diff --git a/pkg/front_end/testcases/inline_class/representation.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/representation.dart.weak.outline.expect
index 43da7a9d5f8..b8ef18006df 100644
--- a/pkg/front_end/testcases/inline_class/representation.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/representation.dart.weak.outline.expect
@@ -28,15 +28,15 @@ extension type Duplicate(core::bool instanceField) {
   tearoff • = self::Duplicate|_#new#tearOff;
 }
 static field core::int Static|staticField;
-static inline-class-member method Static|(core::bool instanceField) → self::Static
+static inline-class-member method Static|(core::bool instanceField) → self::Static /* = core::bool */
   ;
-static inline-class-member method Static|_#new#tearOff(core::bool instanceField) → self::Static
+static inline-class-member method Static|_#new#tearOff(core::bool instanceField) → self::Static /* = core::bool */
   return self::Static|(instanceField);
-static inline-class-member method Multiple|(core::bool instanceField1) → self::Multiple
+static inline-class-member method Multiple|(core::bool instanceField1) → self::Multiple /* = core::bool */
   ;
-static inline-class-member method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple
+static inline-class-member method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple /* = core::bool */
   return self::Multiple|(instanceField1);
-static inline-class-member method Duplicate|(core::int instanceField) → self::Duplicate
+static inline-class-member method Duplicate|(core::int instanceField) → self::Duplicate /* = core::bool */
   ;
-static inline-class-member method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate
+static inline-class-member method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate /* = core::bool */
   return self::Duplicate|(instanceField);
diff --git a/pkg/front_end/testcases/inline_class/representation.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/representation.dart.weak.transformed.expect
index 80d79fd9c19..a26545d13c7 100644
--- a/pkg/front_end/testcases/inline_class/representation.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/representation.dart.weak.transformed.expect
@@ -42,24 +42,24 @@ extension type Duplicate(core::bool instanceField) {
   tearoff • = self::Duplicate|_#new#tearOff;
 }
 static field core::int Static|staticField = 42;
-static inline-class-member method Static|(core::bool instanceField) → self::Static {
-  lowered final self::Static #this = instanceField;
+static inline-class-member method Static|(core::bool instanceField) → self::Static /* = core::bool */ {
+  lowered final self::Static /* = core::bool */ #this = instanceField;
   return #this;
 }
-static inline-class-member method Static|_#new#tearOff(core::bool instanceField) → self::Static
+static inline-class-member method Static|_#new#tearOff(core::bool instanceField) → self::Static /* = core::bool */
   return self::Static|(instanceField);
-static inline-class-member method Multiple|(core::bool instanceField1) → self::Multiple {
-  lowered final self::Multiple #this = instanceField1;
+static inline-class-member method Multiple|(core::bool instanceField1) → self::Multiple /* = core::bool */ {
+  lowered final self::Multiple /* = core::bool */ #this = instanceField1;
   return #this;
 }
-static inline-class-member method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple
+static inline-class-member method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple /* = core::bool */
   return self::Multiple|(instanceField1);
-static inline-class-member method Duplicate|(core::int instanceField) → self::Duplicate {
-  lowered final self::Duplicate #this;
+static inline-class-member method Duplicate|(core::int instanceField) → self::Duplicate /* = core::bool */ {
+  lowered final self::Duplicate /* = core::bool */ #this;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/representation.dart:25:18: Error: Can't use 'instanceField' because it is declared more than once.
   Duplicate(this.instanceField);
                  ^^^^^^^^^^^^^";
   return #this;
 }
-static inline-class-member method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate
+static inline-class-member method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate /* = core::bool */
   return self::Duplicate|(instanceField);
diff --git a/pkg/front_end/testcases/textual_outline.status b/pkg/front_end/testcases/textual_outline.status
index 929a389e8b4..712b2800536 100644
--- a/pkg/front_end/testcases/textual_outline.status
+++ b/pkg/front_end/testcases/textual_outline.status
@@ -155,6 +155,7 @@ inline_class/extension_types/method_access: FormatterCrash
 inline_class/extension_types/non_covariant_type_parameter: FormatterCrash
 inline_class/extension_types/procedures: FormatterCrash
 inline_class/extension_types/representation: FormatterCrash
+inline_class/extension_types/representation_type: FormatterCrash
 inline_class/extension_types/supertype_conflict: FormatterCrash
 inline_class/extension_types/super_extension_type_conflict: FormatterCrash
 inline_class/extension_types/unresolved_type_extension_type_this: FormatterCrash
diff --git a/pkg/kernel/lib/ast.dart b/pkg/kernel/lib/ast.dart
index a2044ec58a9..958a8a52716 100644
--- a/pkg/kernel/lib/ast.dart
+++ b/pkg/kernel/lib/ast.dart
@@ -11690,20 +11690,17 @@ class ExtensionType extends DartType {
       Reference extensionTypeDeclarationReference,
       List<DartType> typeArguments,
       Nullability declaredNullability) {
-    // TODO(johnniwinther): Handle transitive dependencies.
     ExtensionTypeDeclaration extensionTypeDeclaration =
         extensionTypeDeclarationReference.asExtensionTypeDeclaration;
-    if (extensionTypeDeclaration.typeParameters.isEmpty) {
-      return extensionTypeDeclaration.declaredRepresentationType;
-    } else {
-      assert(extensionTypeDeclaration.typeParameters.length ==
-          typeArguments.length);
-      return Substitution.fromPairs(
-              extensionTypeDeclaration.typeParameters, typeArguments)
-          .substituteType(extensionTypeDeclaration.declaredRepresentationType)
-          .withDeclaredNullability(uniteNullabilities(declaredNullability,
-              extensionTypeDeclaration.declaredRepresentationType.nullability));
+    DartType result = Substitution.fromPairs(
+            extensionTypeDeclaration.typeParameters, typeArguments)
+        .substituteType(extensionTypeDeclaration.declaredRepresentationType);
+    if (result is ExtensionType) {
+      result = result.instantiatedRepresentationType;
     }
+    result = result.withDeclaredNullability(combineNullabilitiesForSubstitution(
+        result.nullability, declaredNullability));
+    return result;
   }
 
   @override
diff --git a/pkg/kernel/lib/text/ast_to_text.dart b/pkg/kernel/lib/text/ast_to_text.dart
index 0f3014725de..1b15591fc3e 100644
--- a/pkg/kernel/lib/text/ast_to_text.dart
+++ b/pkg/kernel/lib/text/ast_to_text.dart
@@ -2654,6 +2654,10 @@ class Printer extends Visitor<void> with VisitorVoidMixin {
       state = Printer.WORD;
     }
     writeNullability(node.declaredNullability);
+
+    writeWord("/* =");
+    writeType(node.instantiatedRepresentationType);
+    writeWord("*/");
   }
 
   @override
@@ -2708,8 +2712,8 @@ class Printer extends Visitor<void> with VisitorVoidMixin {
     writeType(node.left);
     writeSpaced('&');
     writeType(node.right);
-    writeWord("/* '");
 
+    writeWord("/* '");
     writeDartTypeNullability(node.left, inComment: true);
     writeWord("' & '");
     writeDartTypeNullability(node.right, inComment: true);
diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/inline_class.dart.expect b/pkg/vm/testcases/transformations/type_flow/transformer/inline_class.dart.expect
index 94b404410b4..c0c5d8df547 100644
--- a/pkg/vm/testcases/transformations/type_flow/transformer/inline_class.dart.expect
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/inline_class.dart.expect
@@ -17,16 +17,16 @@ extension type IC2(core::int id) {
   static method bar1 = self::IC2|bar1;
   constructor • = self::IC2|;
 }
-[@vm.unboxing-info.metadata=(i)->i]static inline-class-member method IC2|([@vm.inferred-type.metadata=int] core::int id) → self::IC2 {
-  lowered final self::IC2 #this = id;
+[@vm.unboxing-info.metadata=(i)->i]static inline-class-member method IC2|([@vm.inferred-type.metadata=int] core::int id) → self::IC2 /* = core::int */ {
+  lowered final self::IC2 /* = core::int */ #this = id;
   return #this;
 }
-[@vm.unboxing-info.metadata=(i)->i]static inline-class-member method IC2|foo1([@vm.inferred-type.metadata=dart.core::_Smi (value: 42)] lowered final self::IC2 #this) → core::int
+[@vm.unboxing-info.metadata=(i)->i]static inline-class-member method IC2|foo1([@vm.inferred-type.metadata=dart.core::_Smi (value: 42)] lowered final self::IC2 /* = core::int */ #this) → core::int
   return [@vm.direct-call.metadata=dart.core::_IntegerImplementation.+] [@vm.inferred-type.metadata=int (skip check)] _in::unsafeCast<core::int>(#this).{core::num::+}(1){(core::num) → core::int};
-[@vm.unboxing-info.metadata=()->i]static inline-class-member method IC2|bar1() → self::IC2
+[@vm.unboxing-info.metadata=()->i]static inline-class-member method IC2|bar1() → self::IC2 /* = core::int */
   return [@vm.inferred-type.metadata=int] self::IC2|([@vm.direct-call.metadata=dart.core::_IntegerImplementation.+] [@vm.inferred-type.metadata=int (skip check)] _in::unsafeCast<core::int>(#C1).{core::num::+}(1){(core::num) → core::int});
 static method main() → dynamic {
-  let final self::C4 #t1 = new self::C4::•() in let final self::IC2 #t2 = [@vm.inferred-type.metadata=dart.core::_Smi (value: 42)] self::IC2|(42) in [@vm.direct-call.metadata=#lib::C4.foo3] [@vm.inferred-type.metadata=!? (skip check)] #t1.{self::C4::foo3}(){(self::IC2) → dynamic};
+  let final self::C4 #t1 = new self::C4::•() in let final self::IC2 /* = core::int */ #t2 = [@vm.inferred-type.metadata=dart.core::_Smi (value: 42)] self::IC2|(42) in [@vm.direct-call.metadata=#lib::C4.foo3] [@vm.inferred-type.metadata=!? (skip check)] #t1.{self::C4::foo3}(){(self::IC2 /* = core::int */) → dynamic};
 }
 constants  {
   #C1 = 42