[cfe] Show nullability formula for extension types in textual output

This is a follow-up to
https://dart-review.googlesource.com/c/sdk/+/350323 and
https://dart-review.googlesource.com/c/sdk/+/351141. It clarifies the
nullability markers shown in the .expect files.

TEST=existing

Change-Id: I248531dd892ea676935d5479c86e43ce8a87628a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/350823
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Commit-Queue: Chloe Stefantsova <cstefantsova@google.com>

pkg/front_end/test/fasta/types/kernel_type_parser_test.dart

@@ -124,19 +124,19 @@ extension type NonNullableExtensionType(self::Object it) implements self::Object
 }
 extension type PotentiallyNullableGenericExtensionType<T extends self::Object? = dynamic>(T% it) {
 }
-extension type PotentiallyNullableGenericExtensionSubType<T extends self::Object? = dynamic>(T% it) implements self::PotentiallyNullableGenericExtensionType<T%> /* = T% */ {
+extension type PotentiallyNullableGenericExtensionSubType<T extends self::Object? = dynamic>(T% it) implements self::PotentiallyNullableGenericExtensionType<T%>% /* erasure=T%, declared=! */ {
 }
 extension type NonNullableGenericExtensionType<T extends self::Object>(T it) implements self::Object {
 }
-extension type NonNullableGenericExtensionSubType<T extends self::Object>(T it) implements self::NonNullableGenericExtensionType<T> /* = T */ {
+extension type NonNullableGenericExtensionSubType<T extends self::Object>(T it) implements self::NonNullableGenericExtensionType<T> /* erasure=T */ {
 }
 extension type GenericExtensionTypeImplements<T extends self::Object? = dynamic>(self::GenericClass<T%> it) implements self::GenericClass<T%> {
 }
-extension type GenericSubExtensionTypeImplements<T extends self::Object? = dynamic>(self::SubGenericClass<T%> it) implements self::GenericExtensionTypeImplements<T%> /* = self::GenericClass<T%> */, self::SubGenericClass<T%> {
+extension type GenericSubExtensionTypeImplements<T extends self::Object? = dynamic>(self::SubGenericClass<T%> it) implements self::GenericExtensionTypeImplements<T%> /* erasure=self::GenericClass<T%> */, self::SubGenericClass<T%> {
 }
-extension type PotentiallyNullableNestedGenericExtensionType<T extends self::Object? = dynamic>(self::PotentiallyNullableGenericExtensionType<T%> /* = T% */ it) {
+extension type PotentiallyNullableNestedGenericExtensionType<T extends self::Object? = dynamic>(self::PotentiallyNullableGenericExtensionType<T%>% /* erasure=T%, declared=! */ it) {
 }
-extension type NonNullableNestedGenericExtensionType<T extends self::Object>(self::NonNullableGenericExtensionType<T> /* = T */ it) implements self::Object {
+extension type NonNullableNestedGenericExtensionType<T extends self::Object>(self::NonNullableGenericExtensionType<T> /* erasure=T */ it) implements self::Object {
 }
 """;
 

pkg/front_end/test/macros/application/data/tests/targets.dart.expect

@@ -1968,11 +1968,11 @@ static field core::int variable = 0;
 @#C39
 @#C40
 static method function() → void {}
-static extension-type-member method ExtensionType|constructor#(core::int it) → self::ExtensionType /* = core::int */ {
-  lowered final self::ExtensionType /* = core::int */ #this = it;
+static extension-type-member method ExtensionType|constructor#(core::int it) → self::ExtensionType% /* erasure=core::int, declared=! */ {
+  lowered final self::ExtensionType% /* erasure=core::int, declared=! */ #this = it;
   return #this;
 }
-static extension-type-member method ExtensionType|constructor#_#new#tearOff(core::int it) → self::ExtensionType /* = core::int */
+static extension-type-member method ExtensionType|constructor#_#new#tearOff(core::int it) → self::ExtensionType% /* erasure=core::int, declared=! */
   return self::ExtensionType|constructor#(it);
 
 constants  {

pkg/front_end/test/spell_checking_list_common.txt

@@ -166,6 +166,7 @@ appearing
 appears
 append
 appended
+appending
 appends
 application
 application's
@@ -2427,6 +2428,7 @@ pseudo
 pub
 public
 publications
+publicly
 published
 pull
 punctuation

pkg/front_end/testcases/dart2js/extension_types/external.dart.strong.expect

@@ -44,52 +44,52 @@ extension type B(self::A a) {
   constructor named = self::B|constructor#named;
   constructor tearoff named = self::B|constructor#_#named#tearOff;
 }
-static extension-type-member method B|constructor#_(self::A a) → self::B /* = self::A */ {
-  lowered final self::B /* = self::A */ #this = a;
+static extension-type-member method B|constructor#_(self::A a) → self::B% /* erasure=self::A, declared=! */ {
+  lowered final self::B% /* erasure=self::A, declared=! */ #this = a;
   return #this;
 }
-static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B /* = self::A */
+static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#_(a);
-external static extension-type-member method B|constructor#(self::A a) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B /* = self::A */
+external static extension-type-member method B|constructor#(self::A a) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#(a);
-external static extension-type-member method B|constructor#named(core::int i) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B /* = self::A */
+external static extension-type-member method B|constructor#named(core::int i) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#named(i);
 external static extension-type-member method B|get#field(lowered self::A #this) → self::A;
 external static extension-type-member method B|set#field(lowered self::A #this, synthesized self::A #externalFieldValue) → void;
-external static extension-type-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
-static extension-type-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
+external static extension-type-member method B|method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::A;
+static extension-type-member method B|get#method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static extension-type-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 extension-type-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 extension-type-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
-external static extension-type-member method B|get#property(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#property(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
+external static extension-type-member method B|genericMethod<T extends self::B% /* erasure=self::A, declared=! */>(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static extension-type-member method B|get#genericMethod(lowered final self::B% /* erasure=self::A, declared=! */ #this) → <T extends self::B% /* erasure=self::A, declared=! */>(T%) → T%
+  return <T extends self::B% /* erasure=self::A, declared=! */>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
+external static extension-type-member method B|get#getter(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#setter(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member method B|get#property(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#property(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
 external static extension-type-member get B|staticField() → self::A;
 external static extension-type-member set B|staticField(synthesized self::A #externalFieldValue) → void;
 external static extension-type-member method B|staticMethod() → self::A;
-external static extension-type-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static extension-type-member get B|staticGetter() → self::B /* = self::A */;
-external static extension-type-member set B|staticSetter(self::B /* = self::A */ b) → void;
-external static extension-type-member get B|staticProperty() → self::B /* = self::A */;
-external static extension-type-member set B|staticProperty(self::B /* = self::A */ b) → void;
+external static extension-type-member method B|staticGenericMethod<T extends self::B% /* erasure=self::A, declared=! */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static extension-type-member get B|staticGetter() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticSetter(self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member get B|staticProperty() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticProperty(self::B% /* erasure=self::A, declared=! */ b) → void;
 static method method(self::A a) → void {
-  self::B /* = self::A */ b1 = self::B|constructor#(a);
-  self::B /* = self::A */ b2 = self::B|constructor#named(0);
+  self::B% /* erasure=self::A, declared=! */ b1 = self::B|constructor#(a);
+  self::B% /* erasure=self::A, declared=! */ b2 = self::B|constructor#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 /* = self::A */>(b2, b2);
+  b2 = self::B|genericMethod<self::B% /* erasure=self::A, declared=! */>(b2, b2);
   b1 = self::B|get#getter(b2);
   self::B|set#setter(b1, b2);
   self::B|set#property(b1, self::B|get#property(b2));
   a = self::B|staticField;
   self::B|staticField = a;
   a = self::B|staticMethod();
-  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
+  b2 = self::B|staticGenericMethod<self::B% /* erasure=self::A, declared=! */>(b2);
   b1 = self::B|staticGetter;
   self::B|staticSetter = b2;
   self::B|staticProperty = self::B|staticProperty;

pkg/front_end/testcases/dart2js/extension_types/external.dart.strong.transformed.expect

@@ -46,55 +46,55 @@ extension type B(self::A a) {
   constructor named = self::B|constructor#named;
   constructor tearoff named = self::B|constructor#_#named#tearOff;
 }
-static extension-type-member method B|constructor#_(self::A a) → self::B /* = self::A */ {
-  lowered final self::B /* = self::A */ #this = a;
+static extension-type-member method B|constructor#_(self::A a) → self::B% /* erasure=self::A, declared=! */ {
+  lowered final self::B% /* erasure=self::A, declared=! */ #this = a;
   return #this;
 }
-static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B /* = self::A */
+static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#_(a);
-external static extension-type-member method B|constructor#(self::A a) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B /* = self::A */
-  return js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), a);
-external static extension-type-member method B|constructor#named(core::int i) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B /* = self::A */
-  return js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), i);
+external static extension-type-member method B|constructor#(self::A a) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
+  return js_2::_callConstructorUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), a);
+external static extension-type-member method B|constructor#named(core::int i) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B% /* erasure=self::A, declared=! */
+  return js_2::_callConstructorUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), i);
 external static extension-type-member method B|get#field(lowered self::A #this) → self::A;
 external static extension-type-member method B|set#field(lowered self::A #this, synthesized self::A #externalFieldValue) → void;
-external static extension-type-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
-static extension-type-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
+external static extension-type-member method B|method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::A;
+static extension-type-member method B|get#method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → () → self::A
   return () → self::A => js_2::_callMethodUnchecked0<self::A>(#this, "method");
-external static extension-type-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 extension-type-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 extension-type-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
-external static extension-type-member method B|get#property(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#property(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
+external static extension-type-member method B|genericMethod<T extends self::B% /* erasure=self::A, declared=! */>(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static extension-type-member method B|get#genericMethod(lowered final self::B% /* erasure=self::A, declared=! */ #this) → <T extends self::B% /* erasure=self::A, declared=! */>(T%) → T%
+  return <T extends self::B% /* erasure=self::A, declared=! */>(T% t) → T% => js_2::callMethod<T%>(#this, "genericMethod", <dynamic>[t]);
+external static extension-type-member method B|get#getter(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#setter(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member method B|get#property(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#property(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
 external static extension-type-member get B|staticField() → self::A;
 external static extension-type-member set B|staticField(synthesized self::A #externalFieldValue) → void;
 external static extension-type-member method B|staticMethod() → self::A;
-external static extension-type-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static extension-type-member get B|staticGetter() → self::B /* = self::A */;
-external static extension-type-member set B|staticSetter(self::B /* = self::A */ b) → void;
-external static extension-type-member get B|staticProperty() → self::B /* = self::A */;
-external static extension-type-member set B|staticProperty(self::B /* = self::A */ b) → void;
+external static extension-type-member method B|staticGenericMethod<T extends self::B% /* erasure=self::A, declared=! */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static extension-type-member get B|staticGetter() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticSetter(self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member get B|staticProperty() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticProperty(self::B% /* erasure=self::A, declared=! */ b) → void;
 static method method(self::A a) → void {
-  self::B /* = self::A */ b1 = js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), a);
-  self::B /* = self::A */ b2 = js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), 0);
+  self::B% /* erasure=self::A, declared=! */ b1 = js_2::_callConstructorUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), a);
+  self::B% /* erasure=self::A, declared=! */ b2 = js_2::_callConstructorUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "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::_callMethodUnchecked1<self::B /* = self::A */>(b2, "genericMethod", b2);
-  b1 = js_2::getProperty<self::B /* = self::A */>(b2, "getter");
-  js_2::setProperty<self::B /* = self::A */>(b1, "setter", b2);
-  js_2::setProperty<self::B /* = self::A */>(b1, "property", js_2::getProperty<self::B /* = self::A */>(b2, "property"));
+  b2 = js_2::_callMethodUnchecked1<self::B% /* erasure=self::A, declared=! */>(b2, "genericMethod", b2);
+  b1 = js_2::getProperty<self::B% /* erasure=self::A, declared=! */>(b2, "getter");
+  js_2::setProperty<self::B% /* erasure=self::A, declared=! */>(b1, "setter", b2);
+  js_2::setProperty<self::B% /* erasure=self::A, declared=! */>(b1, "property", js_2::getProperty<self::B% /* erasure=self::A, declared=! */>(b2, "property"));
   a = js_2::getProperty<self::A>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticField");
   js_2::setProperty<self::A>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticField", a);
   a = js_2::_callMethodUnchecked0<self::A>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticMethod");
-  b2 = js_2::_callMethodUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticGenericMethod", b2);
-  b1 = js_2::getProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticGetter");
-  js_2::setProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticSetter", b2);
-  js_2::setProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticProperty", js_2::getProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticProperty"));
+  b2 = js_2::_callMethodUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticGenericMethod", b2);
+  b1 = js_2::getProperty<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticGetter");
+  js_2::setProperty<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticSetter", b2);
+  js_2::setProperty<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticProperty", js_2::getProperty<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticProperty"));
 }
 
 constants  {

pkg/front_end/testcases/dart2js/extension_types/external.dart.weak.expect

@@ -44,52 +44,52 @@ extension type B(self::A a) {
   constructor named = self::B|constructor#named;
   constructor tearoff named = self::B|constructor#_#named#tearOff;
 }
-static extension-type-member method B|constructor#_(self::A a) → self::B /* = self::A */ {
-  lowered final self::B /* = self::A */ #this = a;
+static extension-type-member method B|constructor#_(self::A a) → self::B% /* erasure=self::A, declared=! */ {
+  lowered final self::B% /* erasure=self::A, declared=! */ #this = a;
   return #this;
 }
-static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B /* = self::A */
+static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#_(a);
-external static extension-type-member method B|constructor#(self::A a) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B /* = self::A */
+external static extension-type-member method B|constructor#(self::A a) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#(a);
-external static extension-type-member method B|constructor#named(core::int i) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B /* = self::A */
+external static extension-type-member method B|constructor#named(core::int i) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#named(i);
 external static extension-type-member method B|get#field(lowered self::A #this) → self::A;
 external static extension-type-member method B|set#field(lowered self::A #this, synthesized self::A #externalFieldValue) → void;
-external static extension-type-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
-static extension-type-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
+external static extension-type-member method B|method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::A;
+static extension-type-member method B|get#method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static extension-type-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 extension-type-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 extension-type-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
-external static extension-type-member method B|get#property(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#property(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
+external static extension-type-member method B|genericMethod<T extends self::B% /* erasure=self::A, declared=! */>(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static extension-type-member method B|get#genericMethod(lowered final self::B% /* erasure=self::A, declared=! */ #this) → <T extends self::B% /* erasure=self::A, declared=! */>(T%) → T%
+  return <T extends self::B% /* erasure=self::A, declared=! */>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
+external static extension-type-member method B|get#getter(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#setter(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member method B|get#property(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#property(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
 external static extension-type-member get B|staticField() → self::A;
 external static extension-type-member set B|staticField(synthesized self::A #externalFieldValue) → void;
 external static extension-type-member method B|staticMethod() → self::A;
-external static extension-type-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static extension-type-member get B|staticGetter() → self::B /* = self::A */;
-external static extension-type-member set B|staticSetter(self::B /* = self::A */ b) → void;
-external static extension-type-member get B|staticProperty() → self::B /* = self::A */;
-external static extension-type-member set B|staticProperty(self::B /* = self::A */ b) → void;
+external static extension-type-member method B|staticGenericMethod<T extends self::B% /* erasure=self::A, declared=! */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static extension-type-member get B|staticGetter() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticSetter(self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member get B|staticProperty() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticProperty(self::B% /* erasure=self::A, declared=! */ b) → void;
 static method method(self::A a) → void {
-  self::B /* = self::A */ b1 = self::B|constructor#(a);
-  self::B /* = self::A */ b2 = self::B|constructor#named(0);
+  self::B% /* erasure=self::A, declared=! */ b1 = self::B|constructor#(a);
+  self::B% /* erasure=self::A, declared=! */ b2 = self::B|constructor#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 /* = self::A */>(b2, b2);
+  b2 = self::B|genericMethod<self::B% /* erasure=self::A, declared=! */>(b2, b2);
   b1 = self::B|get#getter(b2);
   self::B|set#setter(b1, b2);
   self::B|set#property(b1, self::B|get#property(b2));
   a = self::B|staticField;
   self::B|staticField = a;
   a = self::B|staticMethod();
-  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
+  b2 = self::B|staticGenericMethod<self::B% /* erasure=self::A, declared=! */>(b2);
   b1 = self::B|staticGetter;
   self::B|staticSetter = b2;
   self::B|staticProperty = self::B|staticProperty;

pkg/front_end/testcases/dart2js/extension_types/external.dart.weak.modular.expect

@@ -44,52 +44,52 @@ extension type B(self::A a) {
   constructor named = self::B|constructor#named;
   constructor tearoff named = self::B|constructor#_#named#tearOff;
 }
-static extension-type-member method B|constructor#_(self::A a) → self::B /* = self::A */ {
-  lowered final self::B /* = self::A */ #this = a;
+static extension-type-member method B|constructor#_(self::A a) → self::B% /* erasure=self::A, declared=! */ {
+  lowered final self::B% /* erasure=self::A, declared=! */ #this = a;
   return #this;
 }
-static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B /* = self::A */
+static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#_(a);
-external static extension-type-member method B|constructor#(self::A a) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B /* = self::A */
+external static extension-type-member method B|constructor#(self::A a) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#(a);
-external static extension-type-member method B|constructor#named(core::int i) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B /* = self::A */
+external static extension-type-member method B|constructor#named(core::int i) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#named(i);
 external static extension-type-member method B|get#field(lowered self::A #this) → self::A;
 external static extension-type-member method B|set#field(lowered self::A #this, synthesized self::A #externalFieldValue) → void;
-external static extension-type-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
-static extension-type-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
+external static extension-type-member method B|method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::A;
+static extension-type-member method B|get#method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static extension-type-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 extension-type-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 extension-type-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
-external static extension-type-member method B|get#property(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#property(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
+external static extension-type-member method B|genericMethod<T extends self::B% /* erasure=self::A, declared=! */>(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static extension-type-member method B|get#genericMethod(lowered final self::B% /* erasure=self::A, declared=! */ #this) → <T extends self::B% /* erasure=self::A, declared=! */>(T%) → T%
+  return <T extends self::B% /* erasure=self::A, declared=! */>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
+external static extension-type-member method B|get#getter(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#setter(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member method B|get#property(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#property(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
 external static extension-type-member get B|staticField() → self::A;
 external static extension-type-member set B|staticField(synthesized self::A #externalFieldValue) → void;
 external static extension-type-member method B|staticMethod() → self::A;
-external static extension-type-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static extension-type-member get B|staticGetter() → self::B /* = self::A */;
-external static extension-type-member set B|staticSetter(self::B /* = self::A */ b) → void;
-external static extension-type-member get B|staticProperty() → self::B /* = self::A */;
-external static extension-type-member set B|staticProperty(self::B /* = self::A */ b) → void;
+external static extension-type-member method B|staticGenericMethod<T extends self::B% /* erasure=self::A, declared=! */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static extension-type-member get B|staticGetter() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticSetter(self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member get B|staticProperty() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticProperty(self::B% /* erasure=self::A, declared=! */ b) → void;
 static method method(self::A a) → void {
-  self::B /* = self::A */ b1 = self::B|constructor#(a);
-  self::B /* = self::A */ b2 = self::B|constructor#named(0);
+  self::B% /* erasure=self::A, declared=! */ b1 = self::B|constructor#(a);
+  self::B% /* erasure=self::A, declared=! */ b2 = self::B|constructor#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 /* = self::A */>(b2, b2);
+  b2 = self::B|genericMethod<self::B% /* erasure=self::A, declared=! */>(b2, b2);
   b1 = self::B|get#getter(b2);
   self::B|set#setter(b1, b2);
   self::B|set#property(b1, self::B|get#property(b2));
   a = self::B|staticField;
   self::B|staticField = a;
   a = self::B|staticMethod();
-  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
+  b2 = self::B|staticGenericMethod<self::B% /* erasure=self::A, declared=! */>(b2);
   b1 = self::B|staticGetter;
   self::B|staticSetter = b2;
   self::B|staticProperty = self::B|staticProperty;

pkg/front_end/testcases/dart2js/extension_types/external.dart.weak.outline.expect

@@ -43,36 +43,36 @@ extension type B(self::A a) {
   constructor named = self::B|constructor#named;
   constructor tearoff named = self::B|constructor#_#named#tearOff;
 }
-static extension-type-member method B|constructor#_(self::A a) → self::B /* = self::A */
+static extension-type-member method B|constructor#_(self::A a) → self::B% /* erasure=self::A, declared=! */
   ;
-static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B /* = self::A */
+static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#_(a);
-external static extension-type-member method B|constructor#(self::A a) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B /* = self::A */
+external static extension-type-member method B|constructor#(self::A a) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#(a);
-external static extension-type-member method B|constructor#named(core::int i) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B /* = self::A */
+external static extension-type-member method B|constructor#named(core::int i) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#named(i);
 external static extension-type-member method B|get#field(lowered self::A #this) → self::A;
 external static extension-type-member method B|set#field(lowered self::A #this, synthesized self::A #externalFieldValue) → void;
-external static extension-type-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
-static extension-type-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
+external static extension-type-member method B|method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::A;
+static extension-type-member method B|get#method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static extension-type-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 extension-type-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 extension-type-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
-external static extension-type-member method B|get#property(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#property(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
+external static extension-type-member method B|genericMethod<T extends self::B% /* erasure=self::A, declared=! */>(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static extension-type-member method B|get#genericMethod(lowered final self::B% /* erasure=self::A, declared=! */ #this) → <T extends self::B% /* erasure=self::A, declared=! */>(T%) → T%
+  return <T extends self::B% /* erasure=self::A, declared=! */>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
+external static extension-type-member method B|get#getter(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#setter(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member method B|get#property(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#property(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
 external static extension-type-member get B|staticField() → self::A;
 external static extension-type-member set B|staticField(synthesized self::A #externalFieldValue) → void;
 external static extension-type-member method B|staticMethod() → self::A;
-external static extension-type-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static extension-type-member get B|staticGetter() → self::B /* = self::A */;
-external static extension-type-member set B|staticSetter(self::B /* = self::A */ b) → void;
-external static extension-type-member get B|staticProperty() → self::B /* = self::A */;
-external static extension-type-member set B|staticProperty(self::B /* = self::A */ b) → void;
+external static extension-type-member method B|staticGenericMethod<T extends self::B% /* erasure=self::A, declared=! */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static extension-type-member get B|staticGetter() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticSetter(self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member get B|staticProperty() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticProperty(self::B% /* erasure=self::A, declared=! */ b) → void;
 static method method(self::A a) → void
   ;
 

pkg/front_end/testcases/dart2js/extension_types/external.dart.weak.transformed.expect

@@ -46,55 +46,55 @@ extension type B(self::A a) {
   constructor named = self::B|constructor#named;
   constructor tearoff named = self::B|constructor#_#named#tearOff;
 }
-static extension-type-member method B|constructor#_(self::A a) → self::B /* = self::A */ {
-  lowered final self::B /* = self::A */ #this = a;
+static extension-type-member method B|constructor#_(self::A a) → self::B% /* erasure=self::A, declared=! */ {
+  lowered final self::B% /* erasure=self::A, declared=! */ #this = a;
   return #this;
 }
-static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B /* = self::A */
+static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#_(a);
-external static extension-type-member method B|constructor#(self::A a) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B /* = self::A */
-  return js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), a);
-external static extension-type-member method B|constructor#named(core::int i) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B /* = self::A */
-  return js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), i);
+external static extension-type-member method B|constructor#(self::A a) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
+  return js_2::_callConstructorUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), a);
+external static extension-type-member method B|constructor#named(core::int i) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B% /* erasure=self::A, declared=! */
+  return js_2::_callConstructorUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), i);
 external static extension-type-member method B|get#field(lowered self::A #this) → self::A;
 external static extension-type-member method B|set#field(lowered self::A #this, synthesized self::A #externalFieldValue) → void;
-external static extension-type-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
-static extension-type-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
+external static extension-type-member method B|method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::A;
+static extension-type-member method B|get#method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → () → self::A
   return () → self::A => js_2::_callMethodUnchecked0<self::A>(#this, "method");
-external static extension-type-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 extension-type-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 extension-type-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
-external static extension-type-member method B|get#property(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#property(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
+external static extension-type-member method B|genericMethod<T extends self::B% /* erasure=self::A, declared=! */>(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static extension-type-member method B|get#genericMethod(lowered final self::B% /* erasure=self::A, declared=! */ #this) → <T extends self::B% /* erasure=self::A, declared=! */>(T%) → T%
+  return <T extends self::B% /* erasure=self::A, declared=! */>(T% t) → T% => js_2::callMethod<T%>(#this, "genericMethod", <dynamic>[t]);
+external static extension-type-member method B|get#getter(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#setter(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member method B|get#property(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#property(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
 external static extension-type-member get B|staticField() → self::A;
 external static extension-type-member set B|staticField(synthesized self::A #externalFieldValue) → void;
 external static extension-type-member method B|staticMethod() → self::A;
-external static extension-type-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static extension-type-member get B|staticGetter() → self::B /* = self::A */;
-external static extension-type-member set B|staticSetter(self::B /* = self::A */ b) → void;
-external static extension-type-member get B|staticProperty() → self::B /* = self::A */;
-external static extension-type-member set B|staticProperty(self::B /* = self::A */ b) → void;
+external static extension-type-member method B|staticGenericMethod<T extends self::B% /* erasure=self::A, declared=! */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static extension-type-member get B|staticGetter() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticSetter(self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member get B|staticProperty() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticProperty(self::B% /* erasure=self::A, declared=! */ b) → void;
 static method method(self::A a) → void {
-  self::B /* = self::A */ b1 = js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), a);
-  self::B /* = self::A */ b2 = js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), 0);
+  self::B% /* erasure=self::A, declared=! */ b1 = js_2::_callConstructorUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), a);
+  self::B% /* erasure=self::A, declared=! */ b2 = js_2::_callConstructorUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "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::_callMethodUnchecked1<self::B /* = self::A */>(b2, "genericMethod", b2);
-  b1 = js_2::getProperty<self::B /* = self::A */>(b2, "getter");
-  js_2::setProperty<self::B /* = self::A */>(b1, "setter", b2);
-  js_2::setProperty<self::B /* = self::A */>(b1, "property", js_2::getProperty<self::B /* = self::A */>(b2, "property"));
+  b2 = js_2::_callMethodUnchecked1<self::B% /* erasure=self::A, declared=! */>(b2, "genericMethod", b2);
+  b1 = js_2::getProperty<self::B% /* erasure=self::A, declared=! */>(b2, "getter");
+  js_2::setProperty<self::B% /* erasure=self::A, declared=! */>(b1, "setter", b2);
+  js_2::setProperty<self::B% /* erasure=self::A, declared=! */>(b1, "property", js_2::getProperty<self::B% /* erasure=self::A, declared=! */>(b2, "property"));
   a = js_2::getProperty<self::A>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticField");
   js_2::setProperty<self::A>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticField", a);
   a = js_2::_callMethodUnchecked0<self::A>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticMethod");
-  b2 = js_2::_callMethodUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticGenericMethod", b2);
-  b1 = js_2::getProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticGetter");
-  js_2::setProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticSetter", b2);
-  js_2::setProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticProperty", js_2::getProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticProperty"));
+  b2 = js_2::_callMethodUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticGenericMethod", b2);
+  b1 = js_2::getProperty<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticGetter");
+  js_2::setProperty<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticSetter", b2);
+  js_2::setProperty<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticProperty", js_2::getProperty<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticProperty"));
 }
 
 constants  {

pkg/front_end/testcases/dart2js/extension_types/issue51285.dart.strong.expect

@@ -23,46 +23,46 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   static factory • = self::K|constructor#;
   static factory tearoff • = self::K|constructor#_#new#tearOff;
 }
-static extension-type-member method I|constructor#_(core::int i) → self::I /* = core::int */ {
-  lowered final self::I /* = core::int */ #this = i;
+static extension-type-member method I|constructor#_(core::int i) → self::I% /* erasure=core::int, declared=! */ {
+  lowered final self::I% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I /* = core::int */
+static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#_(i);
-static extension-type-member method I|constructor#() → self::I /* = core::int */
-  return 0 as self::I /* = core::int */;
-static extension-type-member method I|constructor#_#new#tearOff() → self::I /* = core::int */
+static extension-type-member method I|constructor#() → self::I% /* erasure=core::int, declared=! */
+  return 0 as self::I% /* erasure=core::int, declared=! */;
+static extension-type-member method I|constructor#_#new#tearOff() → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#();
-static extension-type-member method J|constructor#_(core::int i) → self::J /* = core::int */ {
-  lowered final self::J /* = core::int */ #this = i;
+static extension-type-member method J|constructor#_(core::int i) → self::J% /* erasure=core::int, declared=! */ {
+  lowered final self::J% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#(i);
-static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ {
-  lowered final self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ #this = i;
+static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ {
+  lowered final self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%> /* = self::K|constructor#_#_#tearOff::T% */
+static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%>% /* erasure=self::K|constructor#_#_#tearOff::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#_#_#tearOff::T%>(i);
-static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%> /* = self::K|constructor#::T% */
+static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%>% /* erasure=self::K|constructor#::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#::T%>(i);
-static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%> /* = self::K|constructor#_#new#tearOff::T% */
+static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%>% /* erasure=self::K|constructor#_#new#tearOff::T%, declared=! */
   return self::K|constructor#<self::K|constructor#_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|constructor#());
-  self::expect(0, #C1(){() → self::I /* = core::int */});
+  self::expect(0, #C1(){() → self::I% /* erasure=core::int, declared=! */});
   self::expect(42, self::J|constructor#(42));
   self::expect(87, self::J|constructor#(87));
-  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
+  self::expect(123, #C2(123){(core::int) → self::J% /* erasure=core::int, declared=! */});
   self::expect("foo", self::K|constructor#<core::String>("foo"));
   self::expect("bar", self::K|constructor#<core::String>("bar"));
-  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 */});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))

pkg/front_end/testcases/dart2js/extension_types/issue51285.dart.strong.transformed.expect

@@ -23,46 +23,46 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   static factory • = self::K|constructor#;
   static factory tearoff • = self::K|constructor#_#new#tearOff;
 }
-static extension-type-member method I|constructor#_(core::int i) → self::I /* = core::int */ {
-  lowered final self::I /* = core::int */ #this = i;
+static extension-type-member method I|constructor#_(core::int i) → self::I% /* erasure=core::int, declared=! */ {
+  lowered final self::I% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I /* = core::int */
+static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#_(i);
-static extension-type-member method I|constructor#() → self::I /* = core::int */
-  return 0 as self::I /* = core::int */;
-static extension-type-member method I|constructor#_#new#tearOff() → self::I /* = core::int */
+static extension-type-member method I|constructor#() → self::I% /* erasure=core::int, declared=! */
+  return 0 as self::I% /* erasure=core::int, declared=! */;
+static extension-type-member method I|constructor#_#new#tearOff() → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#();
-static extension-type-member method J|constructor#_(core::int i) → self::J /* = core::int */ {
-  lowered final self::J /* = core::int */ #this = i;
+static extension-type-member method J|constructor#_(core::int i) → self::J% /* erasure=core::int, declared=! */ {
+  lowered final self::J% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#(i);
-static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ {
-  lowered final self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ #this = i;
+static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ {
+  lowered final self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%> /* = self::K|constructor#_#_#tearOff::T% */
+static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%>% /* erasure=self::K|constructor#_#_#tearOff::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#_#_#tearOff::T%>(i);
-static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%> /* = self::K|constructor#::T% */
+static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%>% /* erasure=self::K|constructor#::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#::T%>(i);
-static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%> /* = self::K|constructor#_#new#tearOff::T% */
+static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%>% /* erasure=self::K|constructor#_#new#tearOff::T%, declared=! */
   return self::K|constructor#<self::K|constructor#_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|constructor#());
-  self::expect(0, #C1(){() → self::I /* = core::int */});
+  self::expect(0, #C1(){() → self::I% /* erasure=core::int, declared=! */});
   self::expect(42, self::J|constructor#(42));
   self::expect(87, self::J|constructor#(87));
-  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
+  self::expect(123, #C2(123){(core::int) → self::J% /* erasure=core::int, declared=! */});
   self::expect("foo", self::K|constructor#<core::String>("foo"));
   self::expect("bar", self::K|constructor#<core::String>("bar"));
-  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 */});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))

pkg/front_end/testcases/dart2js/extension_types/issue51285.dart.weak.expect

@@ -23,46 +23,46 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   static factory • = self::K|constructor#;
   static factory tearoff • = self::K|constructor#_#new#tearOff;
 }
-static extension-type-member method I|constructor#_(core::int i) → self::I /* = core::int */ {
-  lowered final self::I /* = core::int */ #this = i;
+static extension-type-member method I|constructor#_(core::int i) → self::I% /* erasure=core::int, declared=! */ {
+  lowered final self::I% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I /* = core::int */
+static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#_(i);
-static extension-type-member method I|constructor#() → self::I /* = core::int */
-  return 0 as self::I /* = core::int */;
-static extension-type-member method I|constructor#_#new#tearOff() → self::I /* = core::int */
+static extension-type-member method I|constructor#() → self::I% /* erasure=core::int, declared=! */
+  return 0 as self::I% /* erasure=core::int, declared=! */;
+static extension-type-member method I|constructor#_#new#tearOff() → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#();
-static extension-type-member method J|constructor#_(core::int i) → self::J /* = core::int */ {
-  lowered final self::J /* = core::int */ #this = i;
+static extension-type-member method J|constructor#_(core::int i) → self::J% /* erasure=core::int, declared=! */ {
+  lowered final self::J% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#(i);
-static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ {
-  lowered final self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ #this = i;
+static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ {
+  lowered final self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%> /* = self::K|constructor#_#_#tearOff::T% */
+static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%>% /* erasure=self::K|constructor#_#_#tearOff::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#_#_#tearOff::T%>(i);
-static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%> /* = self::K|constructor#::T% */
+static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%>% /* erasure=self::K|constructor#::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#::T%>(i);
-static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%> /* = self::K|constructor#_#new#tearOff::T% */
+static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%>% /* erasure=self::K|constructor#_#new#tearOff::T%, declared=! */
   return self::K|constructor#<self::K|constructor#_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|constructor#());
-  self::expect(0, #C1(){() → self::I /* = core::int */});
+  self::expect(0, #C1(){() → self::I% /* erasure=core::int, declared=! */});
   self::expect(42, self::J|constructor#(42));
   self::expect(87, self::J|constructor#(87));
-  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
+  self::expect(123, #C2(123){(core::int) → self::J% /* erasure=core::int, declared=! */});
   self::expect("foo", self::K|constructor#<core::String>("foo"));
   self::expect("bar", self::K|constructor#<core::String>("bar"));
-  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 */});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))

pkg/front_end/testcases/dart2js/extension_types/issue51285.dart.weak.modular.expect

@@ -23,46 +23,46 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   static factory • = self::K|constructor#;
   static factory tearoff • = self::K|constructor#_#new#tearOff;
 }
-static extension-type-member method I|constructor#_(core::int i) → self::I /* = core::int */ {
-  lowered final self::I /* = core::int */ #this = i;
+static extension-type-member method I|constructor#_(core::int i) → self::I% /* erasure=core::int, declared=! */ {
+  lowered final self::I% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I /* = core::int */
+static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#_(i);
-static extension-type-member method I|constructor#() → self::I /* = core::int */
-  return 0 as self::I /* = core::int */;
-static extension-type-member method I|constructor#_#new#tearOff() → self::I /* = core::int */
+static extension-type-member method I|constructor#() → self::I% /* erasure=core::int, declared=! */
+  return 0 as self::I% /* erasure=core::int, declared=! */;
+static extension-type-member method I|constructor#_#new#tearOff() → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#();
-static extension-type-member method J|constructor#_(core::int i) → self::J /* = core::int */ {
-  lowered final self::J /* = core::int */ #this = i;
+static extension-type-member method J|constructor#_(core::int i) → self::J% /* erasure=core::int, declared=! */ {
+  lowered final self::J% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#(i);
-static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ {
-  lowered final self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ #this = i;
+static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ {
+  lowered final self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%> /* = self::K|constructor#_#_#tearOff::T% */
+static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%>% /* erasure=self::K|constructor#_#_#tearOff::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#_#_#tearOff::T%>(i);
-static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%> /* = self::K|constructor#::T% */
+static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%>% /* erasure=self::K|constructor#::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#::T%>(i);
-static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%> /* = self::K|constructor#_#new#tearOff::T% */
+static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%>% /* erasure=self::K|constructor#_#new#tearOff::T%, declared=! */
   return self::K|constructor#<self::K|constructor#_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|constructor#());
-  self::expect(0, #C1(){() → self::I /* = core::int */});
+  self::expect(0, #C1(){() → self::I% /* erasure=core::int, declared=! */});
   self::expect(42, self::J|constructor#(42));
   self::expect(87, self::J|constructor#(87));
-  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
+  self::expect(123, #C2(123){(core::int) → self::J% /* erasure=core::int, declared=! */});
   self::expect("foo", self::K|constructor#<core::String>("foo"));
   self::expect("bar", self::K|constructor#<core::String>("bar"));
-  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 */});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))

pkg/front_end/testcases/dart2js/extension_types/issue51285.dart.weak.outline.expect

@@ -23,29 +23,29 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   static factory • = self::K|constructor#;
   static factory tearoff • = self::K|constructor#_#new#tearOff;
 }
-static extension-type-member method I|constructor#_(core::int i) → self::I /* = core::int */
+static extension-type-member method I|constructor#_(core::int i) → self::I% /* erasure=core::int, declared=! */
   ;
-static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I /* = core::int */
+static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#_(i);
-static extension-type-member method I|constructor#() → self::I /* = core::int */
+static extension-type-member method I|constructor#() → self::I% /* erasure=core::int, declared=! */
   ;
-static extension-type-member method I|constructor#_#new#tearOff() → self::I /* = core::int */
+static extension-type-member method I|constructor#_#new#tearOff() → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#();
-static extension-type-member method J|constructor#_(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_(core::int i) → self::J% /* erasure=core::int, declared=! */
   ;
-static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#(core::int i) → self::J% /* erasure=core::int, declared=! */
   ;
-static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#(i);
-static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */
+static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */
   ;
-static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%> /* = self::K|constructor#_#_#tearOff::T% */
+static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%>% /* erasure=self::K|constructor#_#_#tearOff::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#_#_#tearOff::T%>(i);
-static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%> /* = self::K|constructor#::T% */
+static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%>% /* erasure=self::K|constructor#::T%, declared=! */
   ;
-static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%> /* = self::K|constructor#_#new#tearOff::T% */
+static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%>% /* erasure=self::K|constructor#_#new#tearOff::T%, declared=! */
   return self::K|constructor#<self::K|constructor#_#new#tearOff::T%>(i);
 static method main() → dynamic
   ;

pkg/front_end/testcases/dart2js/extension_types/issue51285.dart.weak.transformed.expect

@@ -23,46 +23,46 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   static factory • = self::K|constructor#;
   static factory tearoff • = self::K|constructor#_#new#tearOff;
 }
-static extension-type-member method I|constructor#_(core::int i) → self::I /* = core::int */ {
-  lowered final self::I /* = core::int */ #this = i;
+static extension-type-member method I|constructor#_(core::int i) → self::I% /* erasure=core::int, declared=! */ {
+  lowered final self::I% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I /* = core::int */
+static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#_(i);
-static extension-type-member method I|constructor#() → self::I /* = core::int */
-  return 0 as self::I /* = core::int */;
-static extension-type-member method I|constructor#_#new#tearOff() → self::I /* = core::int */
+static extension-type-member method I|constructor#() → self::I% /* erasure=core::int, declared=! */
+  return 0 as self::I% /* erasure=core::int, declared=! */;
+static extension-type-member method I|constructor#_#new#tearOff() → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#();
-static extension-type-member method J|constructor#_(core::int i) → self::J /* = core::int */ {
-  lowered final self::J /* = core::int */ #this = i;
+static extension-type-member method J|constructor#_(core::int i) → self::J% /* erasure=core::int, declared=! */ {
+  lowered final self::J% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#(i);
-static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ {
-  lowered final self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ #this = i;
+static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ {
+  lowered final self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%> /* = self::K|constructor#_#_#tearOff::T% */
+static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%>% /* erasure=self::K|constructor#_#_#tearOff::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#_#_#tearOff::T%>(i);
-static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%> /* = self::K|constructor#::T% */
+static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%>% /* erasure=self::K|constructor#::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#::T%>(i);
-static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%> /* = self::K|constructor#_#new#tearOff::T% */
+static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%>% /* erasure=self::K|constructor#_#new#tearOff::T%, declared=! */
   return self::K|constructor#<self::K|constructor#_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|constructor#());
-  self::expect(0, #C1(){() → self::I /* = core::int */});
+  self::expect(0, #C1(){() → self::I% /* erasure=core::int, declared=! */});
   self::expect(42, self::J|constructor#(42));
   self::expect(87, self::J|constructor#(87));
-  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
+  self::expect(123, #C2(123){(core::int) → self::J% /* erasure=core::int, declared=! */});
   self::expect("foo", self::K|constructor#<core::String>("foo"));
   self::expect("bar", self::K|constructor#<core::String>("bar"));
-  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 */});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))

pkg/front_end/testcases/dart2js/js_interop_transforms/isa.dart.strong.expect

@@ -5,71 +5,71 @@ import "dart:js_interop" as js_;
 
 import "dart:js_interop";
 
-extension type CustomJSAny(js_::JSAny /* = dart.core::Object */ _) implements js_::JSAny /* = dart.core::Object */ {
-  abstract extension-type-member representation-field get _() → js_::JSAny /* = dart.core::Object */;
+extension type CustomJSAny(js_::JSAny /* erasure=dart.core::Object */ _) implements js_::JSAny /* erasure=dart.core::Object */ {
+  abstract extension-type-member representation-field get _() → js_::JSAny /* erasure=dart.core::Object */;
   constructor • = self::CustomJSAny|constructor#;
   constructor tearoff • = self::CustomJSAny|constructor#_#new#tearOff;
 }
-extension type CustomJSObject(js_::JSObject /* = _interceptors::JSObject */ _) implements js_::JSObject /* = _interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSObject /* = _interceptors::JSObject */;
+extension type CustomJSObject(js_::JSObject /* erasure=_interceptors::JSObject */ _) implements js_::JSObject /* erasure=_interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSObject /* erasure=_interceptors::JSObject */;
   constructor • = self::CustomJSObject|constructor#;
   constructor tearoff • = self::CustomJSObject|constructor#_#new#tearOff;
 }
-extension type CustomTypedArray(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* = _interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */;
+extension type CustomTypedArray(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* erasure=_interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */;
   constructor • = self::CustomTypedArray|constructor#;
   constructor tearoff • = self::CustomTypedArray|constructor#_#new#tearOff;
 }
 @#C4
-extension type CustomJSArray(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* = _interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */;
+extension type CustomJSArray(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* erasure=_interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */;
   constructor • = self::CustomJSArray|constructor#;
   constructor tearoff • = self::CustomJSArray|constructor#_#new#tearOff;
 }
-static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */ {
-  lowered final self::CustomJSAny /* = dart.core::Object */ #this = _;
+static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */ {
+  lowered final self::CustomJSAny /* erasure=dart.core::Object */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */
+static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */
   return self::CustomJSAny|constructor#(_);
-static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* = _interceptors::JSObject */ _) → self::CustomJSObject /* = _interceptors::JSObject */ {
-  lowered final self::CustomJSObject /* = _interceptors::JSObject */ #this = _;
+static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* erasure=_interceptors::JSObject */ _) → self::CustomJSObject /* erasure=_interceptors::JSObject */ {
+  lowered final self::CustomJSObject /* erasure=_interceptors::JSObject */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* = _interceptors::JSObject */ _) → self::CustomJSObject /* = _interceptors::JSObject */
+static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* erasure=_interceptors::JSObject */ _) → self::CustomJSObject /* erasure=_interceptors::JSObject */
   return self::CustomJSObject|constructor#(_);
-static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ {
-  lowered final self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ #this = _;
+static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ {
+  lowered final self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ #this = _;
   return #this;
 }
-static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */
+static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */
   return self::CustomTypedArray|constructor#(_);
-static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */ {
-  lowered final self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */ #this = _;
+static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */ {
+  lowered final self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */
+static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */
   return self::CustomJSArray|constructor#(_);
-static method test(js_::JSAny /* = dart.core::Object */ any) → void {
-  js_::JSAnyUtilityExtension|isA<js_::JSAny /* = dart.core::Object */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSAny? /* = dart.core::Object? */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSString /* = dart.core::String */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSString? /* = dart.core::String? */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSNumber /* = dart.core::double */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSBoolean /* = dart.core::bool */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSSymbol /* = _interceptors::JavaScriptSymbol */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSBigInt /* = _interceptors::JavaScriptBigInt */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSObject /* = _interceptors::JSObject */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSObject? /* = _interceptors::JSObject? */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomJSAny /* = dart.core::Object */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomJSObject /* = _interceptors::JSObject */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSAny /* = dart.core::Object */>((() → js_::JSAny /* = dart.core::Object */ {
+static method test(js_::JSAny /* erasure=dart.core::Object */ any) → void {
+  js_::JSAnyUtilityExtension|isA<js_::JSAny /* erasure=dart.core::Object */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSAny? /* erasure=dart.core::Object? */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSString /* erasure=dart.core::String */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSString? /* erasure=dart.core::String? */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSNumber /* erasure=dart.core::double */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSBoolean /* erasure=dart.core::bool */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSSymbol /* erasure=_interceptors::JavaScriptSymbol */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSBigInt /* erasure=_interceptors::JavaScriptBigInt */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSObject /* erasure=_interceptors::JSObject */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSObject? /* erasure=_interceptors::JSObject? */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomJSAny /* erasure=dart.core::Object */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomJSObject /* erasure=_interceptors::JSObject */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSAny /* erasure=dart.core::Object */>((() → js_::JSAny /* erasure=dart.core::Object */ {
     return any;
-  })(){() → js_::JSAny /* = dart.core::Object */});
+  })(){() → js_::JSAny /* erasure=dart.core::Object */});
 }
 static method main() → void {}
 

pkg/front_end/testcases/dart2js/js_interop_transforms/isa.dart.strong.transformed.expect

@@ -6,52 +6,52 @@ import "dart:js_interop_unsafe" as js_2;
 
 import "dart:js_interop";
 
-extension type CustomJSAny(js_::JSAny /* = dart.core::Object */ _) implements js_::JSAny /* = dart.core::Object */ {
-  abstract extension-type-member representation-field get _() → js_::JSAny /* = dart.core::Object */;
+extension type CustomJSAny(js_::JSAny /* erasure=dart.core::Object */ _) implements js_::JSAny /* erasure=dart.core::Object */ {
+  abstract extension-type-member representation-field get _() → js_::JSAny /* erasure=dart.core::Object */;
   constructor • = self::CustomJSAny|constructor#;
   constructor tearoff • = self::CustomJSAny|constructor#_#new#tearOff;
 }
-extension type CustomJSObject(js_::JSObject /* = _interceptors::JSObject */ _) implements js_::JSObject /* = _interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSObject /* = _interceptors::JSObject */;
+extension type CustomJSObject(js_::JSObject /* erasure=_interceptors::JSObject */ _) implements js_::JSObject /* erasure=_interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSObject /* erasure=_interceptors::JSObject */;
   constructor • = self::CustomJSObject|constructor#;
   constructor tearoff • = self::CustomJSObject|constructor#_#new#tearOff;
 }
-extension type CustomTypedArray(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* = _interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */;
+extension type CustomTypedArray(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* erasure=_interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */;
   constructor • = self::CustomTypedArray|constructor#;
   constructor tearoff • = self::CustomTypedArray|constructor#_#new#tearOff;
 }
 @#C4
-extension type CustomJSArray(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* = _interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */;
+extension type CustomJSArray(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* erasure=_interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */;
   constructor • = self::CustomJSArray|constructor#;
   constructor tearoff • = self::CustomJSArray|constructor#_#new#tearOff;
 }
-static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */ {
-  lowered final self::CustomJSAny /* = dart.core::Object */ #this = _;
+static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */ {
+  lowered final self::CustomJSAny /* erasure=dart.core::Object */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */
+static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */
   return self::CustomJSAny|constructor#(_);
-static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* = _interceptors::JSObject */ _) → self::CustomJSObject /* = _interceptors::JSObject */ {
-  lowered final self::CustomJSObject /* = _interceptors::JSObject */ #this = _;
+static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* erasure=_interceptors::JSObject */ _) → self::CustomJSObject /* erasure=_interceptors::JSObject */ {
+  lowered final self::CustomJSObject /* erasure=_interceptors::JSObject */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* = _interceptors::JSObject */ _) → self::CustomJSObject /* = _interceptors::JSObject */
+static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* erasure=_interceptors::JSObject */ _) → self::CustomJSObject /* erasure=_interceptors::JSObject */
   return self::CustomJSObject|constructor#(_);
-static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ {
-  lowered final self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ #this = _;
+static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ {
+  lowered final self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ #this = _;
   return #this;
 }
-static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */
+static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */
   return self::CustomTypedArray|constructor#(_);
-static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */ {
-  lowered final self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */ #this = _;
+static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */ {
+  lowered final self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */
+static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */
   return self::CustomJSArray|constructor#(_);
-static method test(js_::JSAny /* = dart.core::Object */ any) → void {
+static method test(js_::JSAny /* erasure=dart.core::Object */ any) → void {
   !(any == null);
   true;
   !(any == null) && js_::JSAnyUtilityExtension|typeofEquals(any, "string");
@@ -63,14 +63,14 @@ static method test(js_::JSAny /* = dart.core::Object */ any) → void {
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "Object");
   any == null || js_::JSAnyUtilityExtension|instanceOfString(any, "Object");
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "Array");
-  !(any == null) && js_::JSAnyUtilityExtension|instanceof(any, js_2::JSObjectUnsafeUtilExtension|callMethodVarArgs<js_::JSFunction /* = _interceptors::JavaScriptFunction */>(js_2::JSObjectUnsafeUtilExtension|[](js_::globalContext, "Object") as{ForLegacy} js_::JSObject /* = _interceptors::JSObject */, js_::StringToJSString|get#toJS("getPrototypeOf"), <js_::JSAny? /* = dart.core::Object? */>[js_2::JSObjectUnsafeUtilExtension|[](js_::globalContext, "Int8Array") as{ForLegacy} js_::JSObject /* = _interceptors::JSObject */]));
+  !(any == null) && js_::JSAnyUtilityExtension|instanceof(any, js_2::JSObjectUnsafeUtilExtension|callMethodVarArgs<js_::JSFunction /* erasure=_interceptors::JavaScriptFunction */>(js_2::JSObjectUnsafeUtilExtension|[](js_::globalContext, "Object") as{ForLegacy} js_::JSObject /* erasure=_interceptors::JSObject */, js_::StringToJSString|get#toJS("getPrototypeOf"), <js_::JSAny? /* erasure=dart.core::Object? */>[js_2::JSObjectUnsafeUtilExtension|[](js_::globalContext, "Int8Array") as{ForLegacy} js_::JSObject /* erasure=_interceptors::JSObject */]));
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "library1.CustomJSAny");
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "library1.CustomJSObject");
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "library1.CustomTypedArray");
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "library1.RenamedJSArray");
-  let final js_::JSAny? /* = dart.core::Object? */ #t1 = (() → js_::JSAny /* = dart.core::Object */ {
+  let final js_::JSAny? /* erasure=dart.core::Object? */ #t1 = (() → js_::JSAny /* erasure=dart.core::Object */ {
     return any;
-  })(){() → js_::JSAny /* = dart.core::Object */} in !(#t1 == null);
+  })(){() → js_::JSAny /* erasure=dart.core::Object */} in !(#t1 == null);
 }
 static method main() → void {}
 

pkg/front_end/testcases/dart2js/js_interop_transforms/isa.dart.weak.expect

@@ -5,71 +5,71 @@ import "dart:js_interop" as js_;
 
 import "dart:js_interop";
 
-extension type CustomJSAny(js_::JSAny /* = dart.core::Object */ _) implements js_::JSAny /* = dart.core::Object */ {
-  abstract extension-type-member representation-field get _() → js_::JSAny /* = dart.core::Object */;
+extension type CustomJSAny(js_::JSAny /* erasure=dart.core::Object */ _) implements js_::JSAny /* erasure=dart.core::Object */ {
+  abstract extension-type-member representation-field get _() → js_::JSAny /* erasure=dart.core::Object */;
   constructor • = self::CustomJSAny|constructor#;
   constructor tearoff • = self::CustomJSAny|constructor#_#new#tearOff;
 }
-extension type CustomJSObject(js_::JSObject /* = _interceptors::JSObject */ _) implements js_::JSObject /* = _interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSObject /* = _interceptors::JSObject */;
+extension type CustomJSObject(js_::JSObject /* erasure=_interceptors::JSObject */ _) implements js_::JSObject /* erasure=_interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSObject /* erasure=_interceptors::JSObject */;
   constructor • = self::CustomJSObject|constructor#;
   constructor tearoff • = self::CustomJSObject|constructor#_#new#tearOff;
 }
-extension type CustomTypedArray(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* = _interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */;
+extension type CustomTypedArray(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* erasure=_interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */;
   constructor • = self::CustomTypedArray|constructor#;
   constructor tearoff • = self::CustomTypedArray|constructor#_#new#tearOff;
 }
 @#C4
-extension type CustomJSArray(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* = _interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */;
+extension type CustomJSArray(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* erasure=_interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */;
   constructor • = self::CustomJSArray|constructor#;
   constructor tearoff • = self::CustomJSArray|constructor#_#new#tearOff;
 }
-static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */ {
-  lowered final self::CustomJSAny /* = dart.core::Object */ #this = _;
+static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */ {
+  lowered final self::CustomJSAny /* erasure=dart.core::Object */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */
+static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */
   return self::CustomJSAny|constructor#(_);
-static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* = _interceptors::JSObject */ _) → self::CustomJSObject /* = _interceptors::JSObject */ {
-  lowered final self::CustomJSObject /* = _interceptors::JSObject */ #this = _;
+static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* erasure=_interceptors::JSObject */ _) → self::CustomJSObject /* erasure=_interceptors::JSObject */ {
+  lowered final self::CustomJSObject /* erasure=_interceptors::JSObject */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* = _interceptors::JSObject */ _) → self::CustomJSObject /* = _interceptors::JSObject */
+static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* erasure=_interceptors::JSObject */ _) → self::CustomJSObject /* erasure=_interceptors::JSObject */
   return self::CustomJSObject|constructor#(_);
-static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ {
-  lowered final self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ #this = _;
+static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ {
+  lowered final self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ #this = _;
   return #this;
 }
-static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */
+static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */
   return self::CustomTypedArray|constructor#(_);
-static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */ {
-  lowered final self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */ #this = _;
+static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */ {
+  lowered final self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */
+static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */
   return self::CustomJSArray|constructor#(_);
-static method test(js_::JSAny /* = dart.core::Object */ any) → void {
-  js_::JSAnyUtilityExtension|isA<js_::JSAny /* = dart.core::Object */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSAny? /* = dart.core::Object? */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSString /* = dart.core::String */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSString? /* = dart.core::String? */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSNumber /* = dart.core::double */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSBoolean /* = dart.core::bool */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSSymbol /* = _interceptors::JavaScriptSymbol */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSBigInt /* = _interceptors::JavaScriptBigInt */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSObject /* = _interceptors::JSObject */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSObject? /* = _interceptors::JSObject? */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomJSAny /* = dart.core::Object */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomJSObject /* = _interceptors::JSObject */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSAny /* = dart.core::Object */>((() → js_::JSAny /* = dart.core::Object */ {
+static method test(js_::JSAny /* erasure=dart.core::Object */ any) → void {
+  js_::JSAnyUtilityExtension|isA<js_::JSAny /* erasure=dart.core::Object */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSAny? /* erasure=dart.core::Object? */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSString /* erasure=dart.core::String */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSString? /* erasure=dart.core::String? */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSNumber /* erasure=dart.core::double */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSBoolean /* erasure=dart.core::bool */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSSymbol /* erasure=_interceptors::JavaScriptSymbol */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSBigInt /* erasure=_interceptors::JavaScriptBigInt */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSObject /* erasure=_interceptors::JSObject */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSObject? /* erasure=_interceptors::JSObject? */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomJSAny /* erasure=dart.core::Object */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomJSObject /* erasure=_interceptors::JSObject */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSAny /* erasure=dart.core::Object */>((() → js_::JSAny /* erasure=dart.core::Object */ {
     return any;
-  })(){() → js_::JSAny /* = dart.core::Object */});
+  })(){() → js_::JSAny /* erasure=dart.core::Object */});
 }
 static method main() → void {}
 

pkg/front_end/testcases/dart2js/js_interop_transforms/isa.dart.weak.modular.expect

@@ -5,71 +5,71 @@ import "dart:js_interop" as js_;
 
 import "dart:js_interop";
 
-extension type CustomJSAny(js_::JSAny /* = dart.core::Object */ _) implements js_::JSAny /* = dart.core::Object */ {
-  abstract extension-type-member representation-field get _() → js_::JSAny /* = dart.core::Object */;
+extension type CustomJSAny(js_::JSAny /* erasure=dart.core::Object */ _) implements js_::JSAny /* erasure=dart.core::Object */ {
+  abstract extension-type-member representation-field get _() → js_::JSAny /* erasure=dart.core::Object */;
   constructor • = self::CustomJSAny|constructor#;
   constructor tearoff • = self::CustomJSAny|constructor#_#new#tearOff;
 }
-extension type CustomJSObject(js_::JSObject /* = _interceptors::JSObject */ _) implements js_::JSObject /* = _interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSObject /* = _interceptors::JSObject */;
+extension type CustomJSObject(js_::JSObject /* erasure=_interceptors::JSObject */ _) implements js_::JSObject /* erasure=_interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSObject /* erasure=_interceptors::JSObject */;
   constructor • = self::CustomJSObject|constructor#;
   constructor tearoff • = self::CustomJSObject|constructor#_#new#tearOff;
 }
-extension type CustomTypedArray(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* = _interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */;
+extension type CustomTypedArray(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* erasure=_interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */;
   constructor • = self::CustomTypedArray|constructor#;
   constructor tearoff • = self::CustomTypedArray|constructor#_#new#tearOff;
 }
 @#C4
-extension type CustomJSArray(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* = _interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */;
+extension type CustomJSArray(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* erasure=_interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */;
   constructor • = self::CustomJSArray|constructor#;
   constructor tearoff • = self::CustomJSArray|constructor#_#new#tearOff;
 }
-static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */ {
-  lowered final self::CustomJSAny /* = dart.core::Object */ #this = _;
+static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */ {
+  lowered final self::CustomJSAny /* erasure=dart.core::Object */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */
+static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */
   return self::CustomJSAny|constructor#(_);
-static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* = _interceptors::JSObject */ _) → self::CustomJSObject /* = _interceptors::JSObject */ {
-  lowered final self::CustomJSObject /* = _interceptors::JSObject */ #this = _;
+static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* erasure=_interceptors::JSObject */ _) → self::CustomJSObject /* erasure=_interceptors::JSObject */ {
+  lowered final self::CustomJSObject /* erasure=_interceptors::JSObject */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* = _interceptors::JSObject */ _) → self::CustomJSObject /* = _interceptors::JSObject */
+static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* erasure=_interceptors::JSObject */ _) → self::CustomJSObject /* erasure=_interceptors::JSObject */
   return self::CustomJSObject|constructor#(_);
-static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ {
-  lowered final self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ #this = _;
+static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ {
+  lowered final self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ #this = _;
   return #this;
 }
-static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */
+static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */
   return self::CustomTypedArray|constructor#(_);
-static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */ {
-  lowered final self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */ #this = _;
+static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */ {
+  lowered final self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */
+static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */
   return self::CustomJSArray|constructor#(_);
-static method test(js_::JSAny /* = dart.core::Object */ any) → void {
-  js_::JSAnyUtilityExtension|isA<js_::JSAny /* = dart.core::Object */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSAny? /* = dart.core::Object? */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSString /* = dart.core::String */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSString? /* = dart.core::String? */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSNumber /* = dart.core::double */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSBoolean /* = dart.core::bool */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSSymbol /* = _interceptors::JavaScriptSymbol */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSBigInt /* = _interceptors::JavaScriptBigInt */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSObject /* = _interceptors::JSObject */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSObject? /* = _interceptors::JSObject? */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomJSAny /* = dart.core::Object */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomJSObject /* = _interceptors::JSObject */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSAny /* = dart.core::Object */>((() → js_::JSAny /* = dart.core::Object */ {
+static method test(js_::JSAny /* erasure=dart.core::Object */ any) → void {
+  js_::JSAnyUtilityExtension|isA<js_::JSAny /* erasure=dart.core::Object */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSAny? /* erasure=dart.core::Object? */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSString /* erasure=dart.core::String */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSString? /* erasure=dart.core::String? */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSNumber /* erasure=dart.core::double */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSBoolean /* erasure=dart.core::bool */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSSymbol /* erasure=_interceptors::JavaScriptSymbol */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSBigInt /* erasure=_interceptors::JavaScriptBigInt */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSObject /* erasure=_interceptors::JSObject */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSObject? /* erasure=_interceptors::JSObject? */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomJSAny /* erasure=dart.core::Object */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomJSObject /* erasure=_interceptors::JSObject */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSAny /* erasure=dart.core::Object */>((() → js_::JSAny /* erasure=dart.core::Object */ {
     return any;
-  })(){() → js_::JSAny /* = dart.core::Object */});
+  })(){() → js_::JSAny /* erasure=dart.core::Object */});
 }
 static method main() → void {}
 

pkg/front_end/testcases/dart2js/js_interop_transforms/isa.dart.weak.outline.expect

@@ -5,44 +5,44 @@ import "dart:js_interop" as js_;
 
 import "dart:js_interop";
 
-extension type CustomJSAny(js_::JSAny /* = dart.core::Object */ _) implements js_::JSAny /* = dart.core::Object */ {
-  abstract extension-type-member representation-field get _() → js_::JSAny /* = dart.core::Object */;
+extension type CustomJSAny(js_::JSAny /* erasure=dart.core::Object */ _) implements js_::JSAny /* erasure=dart.core::Object */ {
+  abstract extension-type-member representation-field get _() → js_::JSAny /* erasure=dart.core::Object */;
   constructor • = self::CustomJSAny|constructor#;
   constructor tearoff • = self::CustomJSAny|constructor#_#new#tearOff;
 }
-extension type CustomJSObject(js_::JSObject /* = _interceptors::JSObject */ _) implements js_::JSObject /* = _interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSObject /* = _interceptors::JSObject */;
+extension type CustomJSObject(js_::JSObject /* erasure=_interceptors::JSObject */ _) implements js_::JSObject /* erasure=_interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSObject /* erasure=_interceptors::JSObject */;
   constructor • = self::CustomJSObject|constructor#;
   constructor tearoff • = self::CustomJSObject|constructor#_#new#tearOff;
 }
-extension type CustomTypedArray(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* = _interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */;
+extension type CustomTypedArray(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* erasure=_interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */;
   constructor • = self::CustomTypedArray|constructor#;
   constructor tearoff • = self::CustomTypedArray|constructor#_#new#tearOff;
 }
 @js_::JS::•("RenamedJSArray")
-extension type CustomJSArray(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* = _interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */;
+extension type CustomJSArray(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* erasure=_interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */;
   constructor • = self::CustomJSArray|constructor#;
   constructor tearoff • = self::CustomJSArray|constructor#_#new#tearOff;
 }
-static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */
+static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */
   ;
-static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */
+static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */
   return self::CustomJSAny|constructor#(_);
-static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* = _interceptors::JSObject */ _) → self::CustomJSObject /* = _interceptors::JSObject */
+static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* erasure=_interceptors::JSObject */ _) → self::CustomJSObject /* erasure=_interceptors::JSObject */
   ;
-static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* = _interceptors::JSObject */ _) → self::CustomJSObject /* = _interceptors::JSObject */
+static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* erasure=_interceptors::JSObject */ _) → self::CustomJSObject /* erasure=_interceptors::JSObject */
   return self::CustomJSObject|constructor#(_);
-static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */
+static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */
   ;
-static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */
+static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */
   return self::CustomTypedArray|constructor#(_);
-static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */
+static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */
   ;
-static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */
+static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */
   return self::CustomJSArray|constructor#(_);
-static method test(js_::JSAny /* = dart.core::Object */ any) → void
+static method test(js_::JSAny /* erasure=dart.core::Object */ any) → void
   ;
 static method main() → void
   ;

pkg/front_end/testcases/dart2js/js_interop_transforms/isa.dart.weak.transformed.expect

@@ -6,52 +6,52 @@ import "dart:js_interop_unsafe" as js_2;
 
 import "dart:js_interop";
 
-extension type CustomJSAny(js_::JSAny /* = dart.core::Object */ _) implements js_::JSAny /* = dart.core::Object */ {
-  abstract extension-type-member representation-field get _() → js_::JSAny /* = dart.core::Object */;
+extension type CustomJSAny(js_::JSAny /* erasure=dart.core::Object */ _) implements js_::JSAny /* erasure=dart.core::Object */ {
+  abstract extension-type-member representation-field get _() → js_::JSAny /* erasure=dart.core::Object */;
   constructor • = self::CustomJSAny|constructor#;
   constructor tearoff • = self::CustomJSAny|constructor#_#new#tearOff;
 }
-extension type CustomJSObject(js_::JSObject /* = _interceptors::JSObject */ _) implements js_::JSObject /* = _interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSObject /* = _interceptors::JSObject */;
+extension type CustomJSObject(js_::JSObject /* erasure=_interceptors::JSObject */ _) implements js_::JSObject /* erasure=_interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSObject /* erasure=_interceptors::JSObject */;
   constructor • = self::CustomJSObject|constructor#;
   constructor tearoff • = self::CustomJSObject|constructor#_#new#tearOff;
 }
-extension type CustomTypedArray(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* = _interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */;
+extension type CustomTypedArray(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* erasure=_interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */;
   constructor • = self::CustomTypedArray|constructor#;
   constructor tearoff • = self::CustomTypedArray|constructor#_#new#tearOff;
 }
 @#C4
-extension type CustomJSArray(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* = _interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */;
+extension type CustomJSArray(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* erasure=_interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */;
   constructor • = self::CustomJSArray|constructor#;
   constructor tearoff • = self::CustomJSArray|constructor#_#new#tearOff;
 }
-static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */ {
-  lowered final self::CustomJSAny /* = dart.core::Object */ #this = _;
+static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */ {
+  lowered final self::CustomJSAny /* erasure=dart.core::Object */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */
+static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */
   return self::CustomJSAny|constructor#(_);
-static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* = _interceptors::JSObject */ _) → self::CustomJSObject /* = _interceptors::JSObject */ {
-  lowered final self::CustomJSObject /* = _interceptors::JSObject */ #this = _;
+static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* erasure=_interceptors::JSObject */ _) → self::CustomJSObject /* erasure=_interceptors::JSObject */ {
+  lowered final self::CustomJSObject /* erasure=_interceptors::JSObject */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* = _interceptors::JSObject */ _) → self::CustomJSObject /* = _interceptors::JSObject */
+static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* erasure=_interceptors::JSObject */ _) → self::CustomJSObject /* erasure=_interceptors::JSObject */
   return self::CustomJSObject|constructor#(_);
-static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ {
-  lowered final self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ #this = _;
+static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ {
+  lowered final self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ #this = _;
   return #this;
 }
-static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */
+static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */
   return self::CustomTypedArray|constructor#(_);
-static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */ {
-  lowered final self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */ #this = _;
+static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */ {
+  lowered final self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = _interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = _interceptors::JSArray<dart.core::Object?> */
+static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=_interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=_interceptors::JSArray<dart.core::Object?> */
   return self::CustomJSArray|constructor#(_);
-static method test(js_::JSAny /* = dart.core::Object */ any) → void {
+static method test(js_::JSAny /* erasure=dart.core::Object */ any) → void {
   !(any == null);
   true;
   !(any == null) && js_::JSAnyUtilityExtension|typeofEquals(any, "string");
@@ -63,14 +63,14 @@ static method test(js_::JSAny /* = dart.core::Object */ any) → void {
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "Object");
   any == null || js_::JSAnyUtilityExtension|instanceOfString(any, "Object");
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "Array");
-  !(any == null) && js_::JSAnyUtilityExtension|instanceof(any, js_2::JSObjectUnsafeUtilExtension|callMethodVarArgs<js_::JSFunction /* = _interceptors::JavaScriptFunction */>(js_2::JSObjectUnsafeUtilExtension|[](js_::globalContext, "Object") as{ForLegacy} js_::JSObject /* = _interceptors::JSObject */, js_::StringToJSString|get#toJS("getPrototypeOf"), <js_::JSAny? /* = dart.core::Object? */>[js_2::JSObjectUnsafeUtilExtension|[](js_::globalContext, "Int8Array") as{ForLegacy} js_::JSObject /* = _interceptors::JSObject */]));
+  !(any == null) && js_::JSAnyUtilityExtension|instanceof(any, js_2::JSObjectUnsafeUtilExtension|callMethodVarArgs<js_::JSFunction /* erasure=_interceptors::JavaScriptFunction */>(js_2::JSObjectUnsafeUtilExtension|[](js_::globalContext, "Object") as{ForLegacy} js_::JSObject /* erasure=_interceptors::JSObject */, js_::StringToJSString|get#toJS("getPrototypeOf"), <js_::JSAny? /* erasure=dart.core::Object? */>[js_2::JSObjectUnsafeUtilExtension|[](js_::globalContext, "Int8Array") as{ForLegacy} js_::JSObject /* erasure=_interceptors::JSObject */]));
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "library1.CustomJSAny");
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "library1.CustomJSObject");
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "library1.CustomTypedArray");
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "library1.RenamedJSArray");
-  let final js_::JSAny? /* = dart.core::Object? */ #t1 = (() → js_::JSAny /* = dart.core::Object */ {
+  let final js_::JSAny? /* erasure=dart.core::Object? */ #t1 = (() → js_::JSAny /* erasure=dart.core::Object */ {
     return any;
-  })(){() → js_::JSAny /* = dart.core::Object */} in !(#t1 == null);
+  })(){() → js_::JSAny /* erasure=dart.core::Object */} in !(#t1 == null);
 }
 static method main() → void {}
 

pkg/front_end/testcases/dart2wasm/issue53239.dart.strong.expect

@@ -19,27 +19,27 @@ extension type ET1(core::int id) {
   constructor tearoff n1 = self::ET1|constructor#_#n1#tearOff;
 }
 static field dynamic log;
-static extension-type-member method ET1|constructor#(core::int id) → self::ET1 /* = core::int */ {
-  lowered final self::ET1 /* = core::int */ #this = id;
+static extension-type-member method ET1|constructor#(core::int id) → self::ET1% /* erasure=core::int, declared=! */ {
+  lowered final self::ET1% /* erasure=core::int, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET1|constructor#_#new#tearOff(core::int id) → self::ET1 /* = core::int */
+static extension-type-member method ET1|constructor#_#new#tearOff(core::int id) → self::ET1% /* erasure=core::int, declared=! */
   return self::ET1|constructor#(id);
-static extension-type-member method ET1|constructor#n1(core::int id, [core::String s = #C2]) → self::ET1 /* = core::int */ {
-  lowered final self::ET1 /* = core::int */ #this = id;
+static extension-type-member method ET1|constructor#n1(core::int id, [core::String s = #C2]) → self::ET1% /* erasure=core::int, declared=! */ {
+  lowered final self::ET1% /* erasure=core::int, declared=! */ #this = id;
   {
     self::log = s;
   }
   return #this;
 }
-static extension-type-member method ET1|constructor#_#n1#tearOff(core::int id, [core::String s = #C2]) → self::ET1 /* = core::int */
+static extension-type-member method ET1|constructor#_#n1#tearOff(core::int id, [core::String s = #C2]) → self::ET1% /* erasure=core::int, declared=! */
   return self::ET1|constructor#n1(id, s);
 static method main() → dynamic {
   (core::int, [core::String]) → self::C1 x = #C3;
   x(0){(core::int, [core::String]) → self::C1};
   self::expect("a", self::log);
-  (core::int, [core::String]) → self::ET1 /* = core::int */ y = #C4;
-  y(1){(core::int, [core::String]) → self::ET1 /* = core::int */};
+  (core::int, [core::String]) → self::ET1% /* erasure=core::int, declared=! */ y = #C4;
+  y(1){(core::int, [core::String]) → self::ET1% /* erasure=core::int, declared=! */};
   self::expect("b", self::log);
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {

pkg/front_end/testcases/dart2wasm/issue53239.dart.strong.transformed.expect

@@ -19,27 +19,27 @@ extension type ET1(core::int id) {
   constructor tearoff n1 = self::ET1|constructor#_#n1#tearOff;
 }
 static field dynamic log;
-static extension-type-member method ET1|constructor#(core::int id) → self::ET1 /* = core::int */ {
-  lowered final self::ET1 /* = core::int */ #this = id;
+static extension-type-member method ET1|constructor#(core::int id) → self::ET1% /* erasure=core::int, declared=! */ {
+  lowered final self::ET1% /* erasure=core::int, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET1|constructor#_#new#tearOff(core::int id) → self::ET1 /* = core::int */
+static extension-type-member method ET1|constructor#_#new#tearOff(core::int id) → self::ET1% /* erasure=core::int, declared=! */
   return self::ET1|constructor#(id);
-static extension-type-member method ET1|constructor#n1(core::int id, [core::String s = #C2]) → self::ET1 /* = core::int */ {
-  lowered final self::ET1 /* = core::int */ #this = id;
+static extension-type-member method ET1|constructor#n1(core::int id, [core::String s = #C2]) → self::ET1% /* erasure=core::int, declared=! */ {
+  lowered final self::ET1% /* erasure=core::int, declared=! */ #this = id;
   {
     self::log = s;
   }
   return #this;
 }
-static extension-type-member method ET1|constructor#_#n1#tearOff(core::int id, [core::String s = #C2]) → self::ET1 /* = core::int */
+static extension-type-member method ET1|constructor#_#n1#tearOff(core::int id, [core::String s = #C2]) → self::ET1% /* erasure=core::int, declared=! */
   return self::ET1|constructor#n1(id, s);
 static method main() → dynamic {
   (core::int, [core::String]) → self::C1 x = #C3;
   x(0){(core::int, [core::String]) → self::C1};
   self::expect("a", self::log);
-  (core::int, [core::String]) → self::ET1 /* = core::int */ y = #C4;
-  y(1){(core::int, [core::String]) → self::ET1 /* = core::int */};
+  (core::int, [core::String]) → self::ET1% /* erasure=core::int, declared=! */ y = #C4;
+  y(1){(core::int, [core::String]) → self::ET1% /* erasure=core::int, declared=! */};
   self::expect("b", self::log);
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {

pkg/front_end/testcases/dartdevc/extension_types/external.dart.strong.expect

@@ -44,52 +44,52 @@ extension type B(self::A a) {
   constructor named = self::B|constructor#named;
   constructor tearoff named = self::B|constructor#_#named#tearOff;
 }
-static extension-type-member method B|constructor#_(self::A a) → self::B /* = self::A */ {
-  lowered final self::B /* = self::A */ #this = a;
+static extension-type-member method B|constructor#_(self::A a) → self::B% /* erasure=self::A, declared=! */ {
+  lowered final self::B% /* erasure=self::A, declared=! */ #this = a;
   return #this;
 }
-static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B /* = self::A */
+static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#_(a);
-external static extension-type-member method B|constructor#(self::A a) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B /* = self::A */
+external static extension-type-member method B|constructor#(self::A a) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#(a);
-external static extension-type-member method B|constructor#named(core::int i) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B /* = self::A */
+external static extension-type-member method B|constructor#named(core::int i) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#named(i);
 external static extension-type-member method B|get#field(lowered self::A #this) → self::A;
 external static extension-type-member method B|set#field(lowered self::A #this, synthesized self::A #externalFieldValue) → void;
-external static extension-type-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
-static extension-type-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
+external static extension-type-member method B|method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::A;
+static extension-type-member method B|get#method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static extension-type-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 extension-type-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 extension-type-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
-external static extension-type-member method B|get#property(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#property(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
+external static extension-type-member method B|genericMethod<T extends self::B% /* erasure=self::A, declared=! */>(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static extension-type-member method B|get#genericMethod(lowered final self::B% /* erasure=self::A, declared=! */ #this) → <T extends self::B% /* erasure=self::A, declared=! */>(T%) → T%
+  return <T extends self::B% /* erasure=self::A, declared=! */>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
+external static extension-type-member method B|get#getter(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#setter(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member method B|get#property(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#property(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
 external static extension-type-member get B|staticField() → self::A;
 external static extension-type-member set B|staticField(synthesized self::A #externalFieldValue) → void;
 external static extension-type-member method B|staticMethod() → self::A;
-external static extension-type-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static extension-type-member get B|staticGetter() → self::B /* = self::A */;
-external static extension-type-member set B|staticSetter(self::B /* = self::A */ b) → void;
-external static extension-type-member get B|staticProperty() → self::B /* = self::A */;
-external static extension-type-member set B|staticProperty(self::B /* = self::A */ b) → void;
+external static extension-type-member method B|staticGenericMethod<T extends self::B% /* erasure=self::A, declared=! */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static extension-type-member get B|staticGetter() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticSetter(self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member get B|staticProperty() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticProperty(self::B% /* erasure=self::A, declared=! */ b) → void;
 static method method(self::A a) → void {
-  self::B /* = self::A */ b1 = self::B|constructor#(a);
-  self::B /* = self::A */ b2 = self::B|constructor#named(0);
+  self::B% /* erasure=self::A, declared=! */ b1 = self::B|constructor#(a);
+  self::B% /* erasure=self::A, declared=! */ b2 = self::B|constructor#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 /* = self::A */>(b2, b2);
+  b2 = self::B|genericMethod<self::B% /* erasure=self::A, declared=! */>(b2, b2);
   b1 = self::B|get#getter(b2);
   self::B|set#setter(b1, b2);
   self::B|set#property(b1, self::B|get#property(b2));
   a = self::B|staticField;
   self::B|staticField = a;
   a = self::B|staticMethod();
-  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
+  b2 = self::B|staticGenericMethod<self::B% /* erasure=self::A, declared=! */>(b2);
   b1 = self::B|staticGetter;
   self::B|staticSetter = b2;
   self::B|staticProperty = self::B|staticProperty;

pkg/front_end/testcases/dartdevc/extension_types/external.dart.strong.transformed.expect

@@ -46,55 +46,55 @@ extension type B(self::A a) {
   constructor named = self::B|constructor#named;
   constructor tearoff named = self::B|constructor#_#named#tearOff;
 }
-static extension-type-member method B|constructor#_(self::A a) → self::B /* = self::A */ {
-  lowered final self::B /* = self::A */ #this = a;
+static extension-type-member method B|constructor#_(self::A a) → self::B% /* erasure=self::A, declared=! */ {
+  lowered final self::B% /* erasure=self::A, declared=! */ #this = a;
   return #this;
 }
-static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B /* = self::A */
+static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#_(a);
-external static extension-type-member method B|constructor#(self::A a) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B /* = self::A */
-  return js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), a);
-external static extension-type-member method B|constructor#named(core::int i) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B /* = self::A */
-  return js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), i);
+external static extension-type-member method B|constructor#(self::A a) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
+  return js_2::_callConstructorUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), a);
+external static extension-type-member method B|constructor#named(core::int i) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B% /* erasure=self::A, declared=! */
+  return js_2::_callConstructorUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), i);
 external static extension-type-member method B|get#field(lowered self::A #this) → self::A;
 external static extension-type-member method B|set#field(lowered self::A #this, synthesized self::A #externalFieldValue) → void;
-external static extension-type-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
-static extension-type-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
+external static extension-type-member method B|method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::A;
+static extension-type-member method B|get#method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → () → self::A
   return () → self::A => js_2::_callMethodUnchecked0<self::A>(#this, "method");
-external static extension-type-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 extension-type-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 extension-type-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
-external static extension-type-member method B|get#property(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#property(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
+external static extension-type-member method B|genericMethod<T extends self::B% /* erasure=self::A, declared=! */>(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static extension-type-member method B|get#genericMethod(lowered final self::B% /* erasure=self::A, declared=! */ #this) → <T extends self::B% /* erasure=self::A, declared=! */>(T%) → T%
+  return <T extends self::B% /* erasure=self::A, declared=! */>(T% t) → T% => js_2::callMethod<T%>(#this, "genericMethod", <dynamic>[t]);
+external static extension-type-member method B|get#getter(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#setter(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member method B|get#property(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#property(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
 external static extension-type-member get B|staticField() → self::A;
 external static extension-type-member set B|staticField(synthesized self::A #externalFieldValue) → void;
 external static extension-type-member method B|staticMethod() → self::A;
-external static extension-type-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static extension-type-member get B|staticGetter() → self::B /* = self::A */;
-external static extension-type-member set B|staticSetter(self::B /* = self::A */ b) → void;
-external static extension-type-member get B|staticProperty() → self::B /* = self::A */;
-external static extension-type-member set B|staticProperty(self::B /* = self::A */ b) → void;
+external static extension-type-member method B|staticGenericMethod<T extends self::B% /* erasure=self::A, declared=! */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static extension-type-member get B|staticGetter() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticSetter(self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member get B|staticProperty() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticProperty(self::B% /* erasure=self::A, declared=! */ b) → void;
 static method method(self::A a) → void {
-  self::B /* = self::A */ b1 = js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), a);
-  self::B /* = self::A */ b2 = js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), 0);
+  self::B% /* erasure=self::A, declared=! */ b1 = js_2::_callConstructorUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), a);
+  self::B% /* erasure=self::A, declared=! */ b2 = js_2::_callConstructorUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "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::_callMethodUnchecked1<self::B /* = self::A */>(b2, "genericMethod", b2);
-  b1 = js_2::getProperty<self::B /* = self::A */>(b2, "getter");
-  js_2::setProperty<self::B /* = self::A */>(b1, "setter", b2);
-  js_2::setProperty<self::B /* = self::A */>(b1, "property", js_2::getProperty<self::B /* = self::A */>(b2, "property"));
+  b2 = js_2::_callMethodUnchecked1<self::B% /* erasure=self::A, declared=! */>(b2, "genericMethod", b2);
+  b1 = js_2::getProperty<self::B% /* erasure=self::A, declared=! */>(b2, "getter");
+  js_2::setProperty<self::B% /* erasure=self::A, declared=! */>(b1, "setter", b2);
+  js_2::setProperty<self::B% /* erasure=self::A, declared=! */>(b1, "property", js_2::getProperty<self::B% /* erasure=self::A, declared=! */>(b2, "property"));
   a = js_2::getProperty<self::A>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticField");
   js_2::setProperty<self::A>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticField", a);
   a = js_2::_callMethodUnchecked0<self::A>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticMethod");
-  b2 = js_2::_callMethodUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticGenericMethod", b2);
-  b1 = js_2::getProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticGetter");
-  js_2::setProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticSetter", b2);
-  js_2::setProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticProperty", js_2::getProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticProperty"));
+  b2 = js_2::_callMethodUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticGenericMethod", b2);
+  b1 = js_2::getProperty<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticGetter");
+  js_2::setProperty<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticSetter", b2);
+  js_2::setProperty<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticProperty", js_2::getProperty<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticProperty"));
 }
 
 constants  {

pkg/front_end/testcases/dartdevc/extension_types/external.dart.weak.expect

@@ -44,52 +44,52 @@ extension type B(self::A a) {
   constructor named = self::B|constructor#named;
   constructor tearoff named = self::B|constructor#_#named#tearOff;
 }
-static extension-type-member method B|constructor#_(self::A a) → self::B /* = self::A */ {
-  lowered final self::B /* = self::A */ #this = a;
+static extension-type-member method B|constructor#_(self::A a) → self::B% /* erasure=self::A, declared=! */ {
+  lowered final self::B% /* erasure=self::A, declared=! */ #this = a;
   return #this;
 }
-static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B /* = self::A */
+static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#_(a);
-external static extension-type-member method B|constructor#(self::A a) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B /* = self::A */
+external static extension-type-member method B|constructor#(self::A a) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#(a);
-external static extension-type-member method B|constructor#named(core::int i) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B /* = self::A */
+external static extension-type-member method B|constructor#named(core::int i) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#named(i);
 external static extension-type-member method B|get#field(lowered self::A #this) → self::A;
 external static extension-type-member method B|set#field(lowered self::A #this, synthesized self::A #externalFieldValue) → void;
-external static extension-type-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
-static extension-type-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
+external static extension-type-member method B|method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::A;
+static extension-type-member method B|get#method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static extension-type-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 extension-type-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 extension-type-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
-external static extension-type-member method B|get#property(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#property(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
+external static extension-type-member method B|genericMethod<T extends self::B% /* erasure=self::A, declared=! */>(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static extension-type-member method B|get#genericMethod(lowered final self::B% /* erasure=self::A, declared=! */ #this) → <T extends self::B% /* erasure=self::A, declared=! */>(T%) → T%
+  return <T extends self::B% /* erasure=self::A, declared=! */>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
+external static extension-type-member method B|get#getter(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#setter(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member method B|get#property(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#property(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
 external static extension-type-member get B|staticField() → self::A;
 external static extension-type-member set B|staticField(synthesized self::A #externalFieldValue) → void;
 external static extension-type-member method B|staticMethod() → self::A;
-external static extension-type-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static extension-type-member get B|staticGetter() → self::B /* = self::A */;
-external static extension-type-member set B|staticSetter(self::B /* = self::A */ b) → void;
-external static extension-type-member get B|staticProperty() → self::B /* = self::A */;
-external static extension-type-member set B|staticProperty(self::B /* = self::A */ b) → void;
+external static extension-type-member method B|staticGenericMethod<T extends self::B% /* erasure=self::A, declared=! */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static extension-type-member get B|staticGetter() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticSetter(self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member get B|staticProperty() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticProperty(self::B% /* erasure=self::A, declared=! */ b) → void;
 static method method(self::A a) → void {
-  self::B /* = self::A */ b1 = self::B|constructor#(a);
-  self::B /* = self::A */ b2 = self::B|constructor#named(0);
+  self::B% /* erasure=self::A, declared=! */ b1 = self::B|constructor#(a);
+  self::B% /* erasure=self::A, declared=! */ b2 = self::B|constructor#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 /* = self::A */>(b2, b2);
+  b2 = self::B|genericMethod<self::B% /* erasure=self::A, declared=! */>(b2, b2);
   b1 = self::B|get#getter(b2);
   self::B|set#setter(b1, b2);
   self::B|set#property(b1, self::B|get#property(b2));
   a = self::B|staticField;
   self::B|staticField = a;
   a = self::B|staticMethod();
-  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
+  b2 = self::B|staticGenericMethod<self::B% /* erasure=self::A, declared=! */>(b2);
   b1 = self::B|staticGetter;
   self::B|staticSetter = b2;
   self::B|staticProperty = self::B|staticProperty;

pkg/front_end/testcases/dartdevc/extension_types/external.dart.weak.modular.expect

@@ -44,52 +44,52 @@ extension type B(self::A a) {
   constructor named = self::B|constructor#named;
   constructor tearoff named = self::B|constructor#_#named#tearOff;
 }
-static extension-type-member method B|constructor#_(self::A a) → self::B /* = self::A */ {
-  lowered final self::B /* = self::A */ #this = a;
+static extension-type-member method B|constructor#_(self::A a) → self::B% /* erasure=self::A, declared=! */ {
+  lowered final self::B% /* erasure=self::A, declared=! */ #this = a;
   return #this;
 }
-static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B /* = self::A */
+static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#_(a);
-external static extension-type-member method B|constructor#(self::A a) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B /* = self::A */
+external static extension-type-member method B|constructor#(self::A a) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#(a);
-external static extension-type-member method B|constructor#named(core::int i) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B /* = self::A */
+external static extension-type-member method B|constructor#named(core::int i) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#named(i);
 external static extension-type-member method B|get#field(lowered self::A #this) → self::A;
 external static extension-type-member method B|set#field(lowered self::A #this, synthesized self::A #externalFieldValue) → void;
-external static extension-type-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
-static extension-type-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
+external static extension-type-member method B|method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::A;
+static extension-type-member method B|get#method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static extension-type-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 extension-type-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 extension-type-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
-external static extension-type-member method B|get#property(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#property(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
+external static extension-type-member method B|genericMethod<T extends self::B% /* erasure=self::A, declared=! */>(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static extension-type-member method B|get#genericMethod(lowered final self::B% /* erasure=self::A, declared=! */ #this) → <T extends self::B% /* erasure=self::A, declared=! */>(T%) → T%
+  return <T extends self::B% /* erasure=self::A, declared=! */>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
+external static extension-type-member method B|get#getter(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#setter(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member method B|get#property(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#property(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
 external static extension-type-member get B|staticField() → self::A;
 external static extension-type-member set B|staticField(synthesized self::A #externalFieldValue) → void;
 external static extension-type-member method B|staticMethod() → self::A;
-external static extension-type-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static extension-type-member get B|staticGetter() → self::B /* = self::A */;
-external static extension-type-member set B|staticSetter(self::B /* = self::A */ b) → void;
-external static extension-type-member get B|staticProperty() → self::B /* = self::A */;
-external static extension-type-member set B|staticProperty(self::B /* = self::A */ b) → void;
+external static extension-type-member method B|staticGenericMethod<T extends self::B% /* erasure=self::A, declared=! */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static extension-type-member get B|staticGetter() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticSetter(self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member get B|staticProperty() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticProperty(self::B% /* erasure=self::A, declared=! */ b) → void;
 static method method(self::A a) → void {
-  self::B /* = self::A */ b1 = self::B|constructor#(a);
-  self::B /* = self::A */ b2 = self::B|constructor#named(0);
+  self::B% /* erasure=self::A, declared=! */ b1 = self::B|constructor#(a);
+  self::B% /* erasure=self::A, declared=! */ b2 = self::B|constructor#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 /* = self::A */>(b2, b2);
+  b2 = self::B|genericMethod<self::B% /* erasure=self::A, declared=! */>(b2, b2);
   b1 = self::B|get#getter(b2);
   self::B|set#setter(b1, b2);
   self::B|set#property(b1, self::B|get#property(b2));
   a = self::B|staticField;
   self::B|staticField = a;
   a = self::B|staticMethod();
-  b2 = self::B|staticGenericMethod<self::B /* = self::A */>(b2);
+  b2 = self::B|staticGenericMethod<self::B% /* erasure=self::A, declared=! */>(b2);
   b1 = self::B|staticGetter;
   self::B|staticSetter = b2;
   self::B|staticProperty = self::B|staticProperty;

pkg/front_end/testcases/dartdevc/extension_types/external.dart.weak.outline.expect

@@ -43,36 +43,36 @@ extension type B(self::A a) {
   constructor named = self::B|constructor#named;
   constructor tearoff named = self::B|constructor#_#named#tearOff;
 }
-static extension-type-member method B|constructor#_(self::A a) → self::B /* = self::A */
+static extension-type-member method B|constructor#_(self::A a) → self::B% /* erasure=self::A, declared=! */
   ;
-static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B /* = self::A */
+static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#_(a);
-external static extension-type-member method B|constructor#(self::A a) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B /* = self::A */
+external static extension-type-member method B|constructor#(self::A a) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#(a);
-external static extension-type-member method B|constructor#named(core::int i) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B /* = self::A */
+external static extension-type-member method B|constructor#named(core::int i) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#named(i);
 external static extension-type-member method B|get#field(lowered self::A #this) → self::A;
 external static extension-type-member method B|set#field(lowered self::A #this, synthesized self::A #externalFieldValue) → void;
-external static extension-type-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
-static extension-type-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
+external static extension-type-member method B|method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::A;
+static extension-type-member method B|get#method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static extension-type-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 extension-type-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 extension-type-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
-external static extension-type-member method B|get#property(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#property(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
+external static extension-type-member method B|genericMethod<T extends self::B% /* erasure=self::A, declared=! */>(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static extension-type-member method B|get#genericMethod(lowered final self::B% /* erasure=self::A, declared=! */ #this) → <T extends self::B% /* erasure=self::A, declared=! */>(T%) → T%
+  return <T extends self::B% /* erasure=self::A, declared=! */>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
+external static extension-type-member method B|get#getter(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#setter(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member method B|get#property(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#property(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
 external static extension-type-member get B|staticField() → self::A;
 external static extension-type-member set B|staticField(synthesized self::A #externalFieldValue) → void;
 external static extension-type-member method B|staticMethod() → self::A;
-external static extension-type-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static extension-type-member get B|staticGetter() → self::B /* = self::A */;
-external static extension-type-member set B|staticSetter(self::B /* = self::A */ b) → void;
-external static extension-type-member get B|staticProperty() → self::B /* = self::A */;
-external static extension-type-member set B|staticProperty(self::B /* = self::A */ b) → void;
+external static extension-type-member method B|staticGenericMethod<T extends self::B% /* erasure=self::A, declared=! */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static extension-type-member get B|staticGetter() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticSetter(self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member get B|staticProperty() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticProperty(self::B% /* erasure=self::A, declared=! */ b) → void;
 static method method(self::A a) → void
   ;
 

pkg/front_end/testcases/dartdevc/extension_types/external.dart.weak.transformed.expect

@@ -46,55 +46,55 @@ extension type B(self::A a) {
   constructor named = self::B|constructor#named;
   constructor tearoff named = self::B|constructor#_#named#tearOff;
 }
-static extension-type-member method B|constructor#_(self::A a) → self::B /* = self::A */ {
-  lowered final self::B /* = self::A */ #this = a;
+static extension-type-member method B|constructor#_(self::A a) → self::B% /* erasure=self::A, declared=! */ {
+  lowered final self::B% /* erasure=self::A, declared=! */ #this = a;
   return #this;
 }
-static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B /* = self::A */
+static extension-type-member method B|constructor#_#_#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
   return self::B|constructor#_(a);
-external static extension-type-member method B|constructor#(self::A a) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B /* = self::A */
-  return js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), a);
-external static extension-type-member method B|constructor#named(core::int i) → self::B /* = self::A */;
-static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B /* = self::A */
-  return js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), i);
+external static extension-type-member method B|constructor#(self::A a) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#new#tearOff(self::A a) → self::B% /* erasure=self::A, declared=! */
+  return js_2::_callConstructorUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), a);
+external static extension-type-member method B|constructor#named(core::int i) → self::B% /* erasure=self::A, declared=! */;
+static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B% /* erasure=self::A, declared=! */
+  return js_2::_callConstructorUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), i);
 external static extension-type-member method B|get#field(lowered self::A #this) → self::A;
 external static extension-type-member method B|set#field(lowered self::A #this, synthesized self::A #externalFieldValue) → void;
-external static extension-type-member method B|method(lowered final self::B /* = self::A */ #this) → self::A;
-static extension-type-member method B|get#method(lowered final self::B /* = self::A */ #this) → () → self::A
+external static extension-type-member method B|method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::A;
+static extension-type-member method B|get#method(lowered final self::B% /* erasure=self::A, declared=! */ #this) → () → self::A
   return () → self::A => js_2::_callMethodUnchecked0<self::A>(#this, "method");
-external static extension-type-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 extension-type-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 extension-type-member method B|get#getter(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#setter(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
-external static extension-type-member method B|get#property(lowered final self::B /* = self::A */ #this) → self::B /* = self::A */;
-external static extension-type-member method B|set#property(lowered final self::B /* = self::A */ #this, self::B /* = self::A */ b) → void;
+external static extension-type-member method B|genericMethod<T extends self::B% /* erasure=self::A, declared=! */>(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static extension-type-member method B|get#genericMethod(lowered final self::B% /* erasure=self::A, declared=! */ #this) → <T extends self::B% /* erasure=self::A, declared=! */>(T%) → T%
+  return <T extends self::B% /* erasure=self::A, declared=! */>(T% t) → T% => js_2::callMethod<T%>(#this, "genericMethod", <dynamic>[t]);
+external static extension-type-member method B|get#getter(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#setter(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member method B|get#property(lowered final self::B% /* erasure=self::A, declared=! */ #this) → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member method B|set#property(lowered final self::B% /* erasure=self::A, declared=! */ #this, self::B% /* erasure=self::A, declared=! */ b) → void;
 external static extension-type-member get B|staticField() → self::A;
 external static extension-type-member set B|staticField(synthesized self::A #externalFieldValue) → void;
 external static extension-type-member method B|staticMethod() → self::A;
-external static extension-type-member method B|staticGenericMethod<T extends self::B /* = self::A */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static extension-type-member get B|staticGetter() → self::B /* = self::A */;
-external static extension-type-member set B|staticSetter(self::B /* = self::A */ b) → void;
-external static extension-type-member get B|staticProperty() → self::B /* = self::A */;
-external static extension-type-member set B|staticProperty(self::B /* = self::A */ b) → void;
+external static extension-type-member method B|staticGenericMethod<T extends self::B% /* erasure=self::A, declared=! */>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static extension-type-member get B|staticGetter() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticSetter(self::B% /* erasure=self::A, declared=! */ b) → void;
+external static extension-type-member get B|staticProperty() → self::B% /* erasure=self::A, declared=! */;
+external static extension-type-member set B|staticProperty(self::B% /* erasure=self::A, declared=! */ b) → void;
 static method method(self::A a) → void {
-  self::B /* = self::A */ b1 = js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), a);
-  self::B /* = self::A */ b2 = js_2::_callConstructorUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), 0);
+  self::B% /* erasure=self::A, declared=! */ b1 = js_2::_callConstructorUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), a);
+  self::B% /* erasure=self::A, declared=! */ b2 = js_2::_callConstructorUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "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::_callMethodUnchecked1<self::B /* = self::A */>(b2, "genericMethod", b2);
-  b1 = js_2::getProperty<self::B /* = self::A */>(b2, "getter");
-  js_2::setProperty<self::B /* = self::A */>(b1, "setter", b2);
-  js_2::setProperty<self::B /* = self::A */>(b1, "property", js_2::getProperty<self::B /* = self::A */>(b2, "property"));
+  b2 = js_2::_callMethodUnchecked1<self::B% /* erasure=self::A, declared=! */>(b2, "genericMethod", b2);
+  b1 = js_2::getProperty<self::B% /* erasure=self::A, declared=! */>(b2, "getter");
+  js_2::setProperty<self::B% /* erasure=self::A, declared=! */>(b1, "setter", b2);
+  js_2::setProperty<self::B% /* erasure=self::A, declared=! */>(b1, "property", js_2::getProperty<self::B% /* erasure=self::A, declared=! */>(b2, "property"));
   a = js_2::getProperty<self::A>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticField");
   js_2::setProperty<self::A>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticField", a);
   a = js_2::_callMethodUnchecked0<self::A>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticMethod");
-  b2 = js_2::_callMethodUnchecked1<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticGenericMethod", b2);
-  b1 = js_2::getProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticGetter");
-  js_2::setProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticSetter", b2);
-  js_2::setProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticProperty", js_2::getProperty<self::B /* = self::A */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticProperty"));
+  b2 = js_2::_callMethodUnchecked1<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticGenericMethod", b2);
+  b1 = js_2::getProperty<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticGetter");
+  js_2::setProperty<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticSetter", b2);
+  js_2::setProperty<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticProperty", js_2::getProperty<self::B% /* erasure=self::A, declared=! */>(js_2::_getPropertyTrustType<core::Object>(_js2::staticInteropGlobalContext, "B"), "staticProperty"));
 }
 
 constants  {

pkg/front_end/testcases/dartdevc/extension_types/issue51285.dart.strong.expect

@@ -23,46 +23,46 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   static factory • = self::K|constructor#;
   static factory tearoff • = self::K|constructor#_#new#tearOff;
 }
-static extension-type-member method I|constructor#_(core::int i) → self::I /* = core::int */ {
-  lowered final self::I /* = core::int */ #this = i;
+static extension-type-member method I|constructor#_(core::int i) → self::I% /* erasure=core::int, declared=! */ {
+  lowered final self::I% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I /* = core::int */
+static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#_(i);
-static extension-type-member method I|constructor#() → self::I /* = core::int */
-  return 0 as self::I /* = core::int */;
-static extension-type-member method I|constructor#_#new#tearOff() → self::I /* = core::int */
+static extension-type-member method I|constructor#() → self::I% /* erasure=core::int, declared=! */
+  return 0 as self::I% /* erasure=core::int, declared=! */;
+static extension-type-member method I|constructor#_#new#tearOff() → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#();
-static extension-type-member method J|constructor#_(core::int i) → self::J /* = core::int */ {
-  lowered final self::J /* = core::int */ #this = i;
+static extension-type-member method J|constructor#_(core::int i) → self::J% /* erasure=core::int, declared=! */ {
+  lowered final self::J% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#(i);
-static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ {
-  lowered final self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ #this = i;
+static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ {
+  lowered final self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%> /* = self::K|constructor#_#_#tearOff::T% */
+static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%>% /* erasure=self::K|constructor#_#_#tearOff::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#_#_#tearOff::T%>(i);
-static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%> /* = self::K|constructor#::T% */
+static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%>% /* erasure=self::K|constructor#::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#::T%>(i);
-static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%> /* = self::K|constructor#_#new#tearOff::T% */
+static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%>% /* erasure=self::K|constructor#_#new#tearOff::T%, declared=! */
   return self::K|constructor#<self::K|constructor#_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|constructor#());
-  self::expect(0, #C1(){() → self::I /* = core::int */});
+  self::expect(0, #C1(){() → self::I% /* erasure=core::int, declared=! */});
   self::expect(42, self::J|constructor#(42));
   self::expect(87, self::J|constructor#(87));
-  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
+  self::expect(123, #C2(123){(core::int) → self::J% /* erasure=core::int, declared=! */});
   self::expect("foo", self::K|constructor#<core::String>("foo"));
   self::expect("bar", self::K|constructor#<core::String>("bar"));
-  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 */});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))

pkg/front_end/testcases/dartdevc/extension_types/issue51285.dart.strong.transformed.expect

@@ -23,46 +23,46 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   static factory • = self::K|constructor#;
   static factory tearoff • = self::K|constructor#_#new#tearOff;
 }
-static extension-type-member method I|constructor#_(core::int i) → self::I /* = core::int */ {
-  lowered final self::I /* = core::int */ #this = i;
+static extension-type-member method I|constructor#_(core::int i) → self::I% /* erasure=core::int, declared=! */ {
+  lowered final self::I% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I /* = core::int */
+static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#_(i);
-static extension-type-member method I|constructor#() → self::I /* = core::int */
-  return 0 as self::I /* = core::int */;
-static extension-type-member method I|constructor#_#new#tearOff() → self::I /* = core::int */
+static extension-type-member method I|constructor#() → self::I% /* erasure=core::int, declared=! */
+  return 0 as self::I% /* erasure=core::int, declared=! */;
+static extension-type-member method I|constructor#_#new#tearOff() → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#();
-static extension-type-member method J|constructor#_(core::int i) → self::J /* = core::int */ {
-  lowered final self::J /* = core::int */ #this = i;
+static extension-type-member method J|constructor#_(core::int i) → self::J% /* erasure=core::int, declared=! */ {
+  lowered final self::J% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#(i);
-static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ {
-  lowered final self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ #this = i;
+static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ {
+  lowered final self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%> /* = self::K|constructor#_#_#tearOff::T% */
+static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%>% /* erasure=self::K|constructor#_#_#tearOff::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#_#_#tearOff::T%>(i);
-static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%> /* = self::K|constructor#::T% */
+static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%>% /* erasure=self::K|constructor#::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#::T%>(i);
-static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%> /* = self::K|constructor#_#new#tearOff::T% */
+static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%>% /* erasure=self::K|constructor#_#new#tearOff::T%, declared=! */
   return self::K|constructor#<self::K|constructor#_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|constructor#());
-  self::expect(0, #C1(){() → self::I /* = core::int */});
+  self::expect(0, #C1(){() → self::I% /* erasure=core::int, declared=! */});
   self::expect(42, self::J|constructor#(42));
   self::expect(87, self::J|constructor#(87));
-  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
+  self::expect(123, #C2(123){(core::int) → self::J% /* erasure=core::int, declared=! */});
   self::expect("foo", self::K|constructor#<core::String>("foo"));
   self::expect("bar", self::K|constructor#<core::String>("bar"));
-  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 */});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))

pkg/front_end/testcases/dartdevc/extension_types/issue51285.dart.weak.expect

@@ -23,46 +23,46 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   static factory • = self::K|constructor#;
   static factory tearoff • = self::K|constructor#_#new#tearOff;
 }
-static extension-type-member method I|constructor#_(core::int i) → self::I /* = core::int */ {
-  lowered final self::I /* = core::int */ #this = i;
+static extension-type-member method I|constructor#_(core::int i) → self::I% /* erasure=core::int, declared=! */ {
+  lowered final self::I% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I /* = core::int */
+static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#_(i);
-static extension-type-member method I|constructor#() → self::I /* = core::int */
-  return 0 as self::I /* = core::int */;
-static extension-type-member method I|constructor#_#new#tearOff() → self::I /* = core::int */
+static extension-type-member method I|constructor#() → self::I% /* erasure=core::int, declared=! */
+  return 0 as self::I% /* erasure=core::int, declared=! */;
+static extension-type-member method I|constructor#_#new#tearOff() → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#();
-static extension-type-member method J|constructor#_(core::int i) → self::J /* = core::int */ {
-  lowered final self::J /* = core::int */ #this = i;
+static extension-type-member method J|constructor#_(core::int i) → self::J% /* erasure=core::int, declared=! */ {
+  lowered final self::J% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#(i);
-static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ {
-  lowered final self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ #this = i;
+static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ {
+  lowered final self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%> /* = self::K|constructor#_#_#tearOff::T% */
+static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%>% /* erasure=self::K|constructor#_#_#tearOff::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#_#_#tearOff::T%>(i);
-static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%> /* = self::K|constructor#::T% */
+static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%>% /* erasure=self::K|constructor#::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#::T%>(i);
-static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%> /* = self::K|constructor#_#new#tearOff::T% */
+static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%>% /* erasure=self::K|constructor#_#new#tearOff::T%, declared=! */
   return self::K|constructor#<self::K|constructor#_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|constructor#());
-  self::expect(0, #C1(){() → self::I /* = core::int */});
+  self::expect(0, #C1(){() → self::I% /* erasure=core::int, declared=! */});
   self::expect(42, self::J|constructor#(42));
   self::expect(87, self::J|constructor#(87));
-  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
+  self::expect(123, #C2(123){(core::int) → self::J% /* erasure=core::int, declared=! */});
   self::expect("foo", self::K|constructor#<core::String>("foo"));
   self::expect("bar", self::K|constructor#<core::String>("bar"));
-  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 */});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))

pkg/front_end/testcases/dartdevc/extension_types/issue51285.dart.weak.modular.expect

@@ -23,46 +23,46 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   static factory • = self::K|constructor#;
   static factory tearoff • = self::K|constructor#_#new#tearOff;
 }
-static extension-type-member method I|constructor#_(core::int i) → self::I /* = core::int */ {
-  lowered final self::I /* = core::int */ #this = i;
+static extension-type-member method I|constructor#_(core::int i) → self::I% /* erasure=core::int, declared=! */ {
+  lowered final self::I% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I /* = core::int */
+static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#_(i);
-static extension-type-member method I|constructor#() → self::I /* = core::int */
-  return 0 as self::I /* = core::int */;
-static extension-type-member method I|constructor#_#new#tearOff() → self::I /* = core::int */
+static extension-type-member method I|constructor#() → self::I% /* erasure=core::int, declared=! */
+  return 0 as self::I% /* erasure=core::int, declared=! */;
+static extension-type-member method I|constructor#_#new#tearOff() → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#();
-static extension-type-member method J|constructor#_(core::int i) → self::J /* = core::int */ {
-  lowered final self::J /* = core::int */ #this = i;
+static extension-type-member method J|constructor#_(core::int i) → self::J% /* erasure=core::int, declared=! */ {
+  lowered final self::J% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#(i);
-static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ {
-  lowered final self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ #this = i;
+static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ {
+  lowered final self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%> /* = self::K|constructor#_#_#tearOff::T% */
+static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%>% /* erasure=self::K|constructor#_#_#tearOff::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#_#_#tearOff::T%>(i);
-static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%> /* = self::K|constructor#::T% */
+static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%>% /* erasure=self::K|constructor#::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#::T%>(i);
-static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%> /* = self::K|constructor#_#new#tearOff::T% */
+static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%>% /* erasure=self::K|constructor#_#new#tearOff::T%, declared=! */
   return self::K|constructor#<self::K|constructor#_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|constructor#());
-  self::expect(0, #C1(){() → self::I /* = core::int */});
+  self::expect(0, #C1(){() → self::I% /* erasure=core::int, declared=! */});
   self::expect(42, self::J|constructor#(42));
   self::expect(87, self::J|constructor#(87));
-  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
+  self::expect(123, #C2(123){(core::int) → self::J% /* erasure=core::int, declared=! */});
   self::expect("foo", self::K|constructor#<core::String>("foo"));
   self::expect("bar", self::K|constructor#<core::String>("bar"));
-  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 */});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))

pkg/front_end/testcases/dartdevc/extension_types/issue51285.dart.weak.outline.expect

@@ -23,29 +23,29 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   static factory • = self::K|constructor#;
   static factory tearoff • = self::K|constructor#_#new#tearOff;
 }
-static extension-type-member method I|constructor#_(core::int i) → self::I /* = core::int */
+static extension-type-member method I|constructor#_(core::int i) → self::I% /* erasure=core::int, declared=! */
   ;
-static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I /* = core::int */
+static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#_(i);
-static extension-type-member method I|constructor#() → self::I /* = core::int */
+static extension-type-member method I|constructor#() → self::I% /* erasure=core::int, declared=! */
   ;
-static extension-type-member method I|constructor#_#new#tearOff() → self::I /* = core::int */
+static extension-type-member method I|constructor#_#new#tearOff() → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#();
-static extension-type-member method J|constructor#_(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_(core::int i) → self::J% /* erasure=core::int, declared=! */
   ;
-static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#(core::int i) → self::J% /* erasure=core::int, declared=! */
   ;
-static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#(i);
-static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */
+static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */
   ;
-static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%> /* = self::K|constructor#_#_#tearOff::T% */
+static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%>% /* erasure=self::K|constructor#_#_#tearOff::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#_#_#tearOff::T%>(i);
-static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%> /* = self::K|constructor#::T% */
+static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%>% /* erasure=self::K|constructor#::T%, declared=! */
   ;
-static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%> /* = self::K|constructor#_#new#tearOff::T% */
+static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%>% /* erasure=self::K|constructor#_#new#tearOff::T%, declared=! */
   return self::K|constructor#<self::K|constructor#_#new#tearOff::T%>(i);
 static method main() → dynamic
   ;

pkg/front_end/testcases/dartdevc/extension_types/issue51285.dart.weak.transformed.expect

@@ -23,46 +23,46 @@ extension type K<T extends core::Object? = dynamic>(T% i) {
   static factory • = self::K|constructor#;
   static factory tearoff • = self::K|constructor#_#new#tearOff;
 }
-static extension-type-member method I|constructor#_(core::int i) → self::I /* = core::int */ {
-  lowered final self::I /* = core::int */ #this = i;
+static extension-type-member method I|constructor#_(core::int i) → self::I% /* erasure=core::int, declared=! */ {
+  lowered final self::I% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I /* = core::int */
+static extension-type-member method I|constructor#_#_#tearOff(core::int i) → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#_(i);
-static extension-type-member method I|constructor#() → self::I /* = core::int */
-  return 0 as self::I /* = core::int */;
-static extension-type-member method I|constructor#_#new#tearOff() → self::I /* = core::int */
+static extension-type-member method I|constructor#() → self::I% /* erasure=core::int, declared=! */
+  return 0 as self::I% /* erasure=core::int, declared=! */;
+static extension-type-member method I|constructor#_#new#tearOff() → self::I% /* erasure=core::int, declared=! */
   return self::I|constructor#();
-static extension-type-member method J|constructor#_(core::int i) → self::J /* = core::int */ {
-  lowered final self::J /* = core::int */ #this = i;
+static extension-type-member method J|constructor#_(core::int i) → self::J% /* erasure=core::int, declared=! */ {
+  lowered final self::J% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#_#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#_(i);
-static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J /* = core::int */
+static extension-type-member method J|constructor#_#new#tearOff(core::int i) → self::J% /* erasure=core::int, declared=! */
   return self::J|constructor#(i);
-static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ {
-  lowered final self::K<self::K|constructor#_::T%> /* = self::K|constructor#_::T% */ #this = i;
+static extension-type-member method K|constructor#_<T extends core::Object? = dynamic>(self::K|constructor#_::T% i) → self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ {
+  lowered final self::K<self::K|constructor#_::T%>% /* erasure=self::K|constructor#_::T%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%> /* = self::K|constructor#_#_#tearOff::T% */
+static extension-type-member method K|constructor#_#_#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#_#tearOff::T% i) → self::K<self::K|constructor#_#_#tearOff::T%>% /* erasure=self::K|constructor#_#_#tearOff::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#_#_#tearOff::T%>(i);
-static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%> /* = self::K|constructor#::T% */
+static extension-type-member method K|constructor#<T extends core::Object? = dynamic>(self::K|constructor#::T% i) → self::K<self::K|constructor#::T%>% /* erasure=self::K|constructor#::T%, declared=! */
   return self::K|constructor#_<self::K|constructor#::T%>(i);
-static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%> /* = self::K|constructor#_#new#tearOff::T% */
+static extension-type-member method K|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::K|constructor#_#new#tearOff::T% i) → self::K<self::K|constructor#_#new#tearOff::T%>% /* erasure=self::K|constructor#_#new#tearOff::T%, declared=! */
   return self::K|constructor#<self::K|constructor#_#new#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|constructor#());
-  self::expect(0, #C1(){() → self::I /* = core::int */});
+  self::expect(0, #C1(){() → self::I% /* erasure=core::int, declared=! */});
   self::expect(42, self::J|constructor#(42));
   self::expect(87, self::J|constructor#(87));
-  self::expect(123, #C2(123){(core::int) → self::J /* = core::int */});
+  self::expect(123, #C2(123){(core::int) → self::J% /* erasure=core::int, declared=! */});
   self::expect("foo", self::K|constructor#<core::String>("foo"));
   self::expect("bar", self::K|constructor#<core::String>("bar"));
-  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 */});
+  self::expect("baz", #C3<core::String>("baz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
+  self::expect("boz", #C4("boz"){(core::String) → self::K<core::String>% /* erasure=core::String, declared=! */});
 }
 static method expect(dynamic expected, dynamic actual) → dynamic {
   if(!(expected =={core::Object::==}{(core::Object) → core::bool} actual))

pkg/front_end/testcases/dartdevc/extension_types/issue54008/main.dart.strong.expect

@@ -21,108 +21,108 @@ extension type SameGeneric<T extends core::Object? = dynamic>(T% s) {
   constructor • = self::SameGeneric|constructor#;
   constructor tearoff • = self::SameGeneric|constructor#_#new#tearOff;
 }
-static const field self::SameString /* = core::String */ sameString0 = #C1;
-static const field self::SameString /* = core::String */ sameString1 = #C2;
-static const field self::SameNullable /* = core::String? */ sameNullable0 = #C3;
-static const field self::SameNullable /* = core::String? */ sameNullable1 = #C1;
-static const field self::SameGeneric<core::String> /* = core::String */ sameGeneric0 = #C1;
-static const field self::SameGeneric<core::String?> /* = core::String? */ sameGeneric1 = #C3;
-static const field self::SameGeneric<core::String?> /* = core::String? */ sameGeneric2 = #C1;
-static const field #lib1::ExtString /* = core::String */ valString0 = #C1;
-static const field #lib1::ExtString /* = core::String */ valString1 = #C2;
-static const field #lib1::ExtNullable /* = core::String? */ valNullable0 = #C3;
-static const field #lib1::ExtNullable /* = core::String? */ valNullable1 = #C1;
-static const field #lib1::ExtGeneric<core::String> /* = core::String */ valGeneric0 = #C1;
-static const field #lib1::ExtGeneric<core::String?> /* = core::String? */ valGeneric1 = #C3;
-static const field #lib1::ExtGeneric<core::String?> /* = core::String? */ valGeneric2 = #C1;
-static extension-type-member method SameString|constructor#(core::String s) → self::SameString /* = core::String */ {
-  lowered final self::SameString /* = core::String */ #this = s;
+static const field self::SameString% /* erasure=core::String, declared=! */ sameString0 = #C1;
+static const field self::SameString% /* erasure=core::String, declared=! */ sameString1 = #C2;
+static const field self::SameNullable% /* erasure=core::String?, declared=! */ sameNullable0 = #C3;
+static const field self::SameNullable% /* erasure=core::String?, declared=! */ sameNullable1 = #C1;
+static const field self::SameGeneric<core::String>% /* erasure=core::String, declared=! */ sameGeneric0 = #C1;
+static const field self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ sameGeneric1 = #C3;
+static const field self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ sameGeneric2 = #C1;
+static const field #lib1::ExtString% /* erasure=core::String, declared=! */ valString0 = #C1;
+static const field #lib1::ExtString% /* erasure=core::String, declared=! */ valString1 = #C2;
+static const field #lib1::ExtNullable% /* erasure=core::String?, declared=! */ valNullable0 = #C3;
+static const field #lib1::ExtNullable% /* erasure=core::String?, declared=! */ valNullable1 = #C1;
+static const field #lib1::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ valGeneric0 = #C1;
+static const field #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ valGeneric1 = #C3;
+static const field #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ valGeneric2 = #C1;
+static extension-type-member method SameString|constructor#(core::String s) → self::SameString% /* erasure=core::String, declared=! */ {
+  lowered final self::SameString% /* erasure=core::String, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method SameString|constructor#_#new#tearOff(core::String s) → self::SameString /* = core::String */
+static extension-type-member method SameString|constructor#_#new#tearOff(core::String s) → self::SameString% /* erasure=core::String, declared=! */
   return self::SameString|constructor#(s);
-static extension-type-member method SameString|constructor#named(core::String s) → self::SameString /* = core::String */ {
-  lowered final self::SameString /* = core::String */ #this = "${s} world";
+static extension-type-member method SameString|constructor#named(core::String s) → self::SameString% /* erasure=core::String, declared=! */ {
+  lowered final self::SameString% /* erasure=core::String, declared=! */ #this = "${s} world";
   return #this;
 }
-static extension-type-member method SameString|constructor#_#named#tearOff(core::String s) → self::SameString /* = core::String */
+static extension-type-member method SameString|constructor#_#named#tearOff(core::String s) → self::SameString% /* erasure=core::String, declared=! */
   return self::SameString|constructor#named(s);
-static extension-type-member method SameNullable|constructor#(core::String? s) → self::SameNullable /* = core::String? */ {
-  lowered final self::SameNullable /* = core::String? */ #this = s;
+static extension-type-member method SameNullable|constructor#(core::String? s) → self::SameNullable% /* erasure=core::String?, declared=! */ {
+  lowered final self::SameNullable% /* erasure=core::String?, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method SameNullable|constructor#_#new#tearOff(core::String? s) → self::SameNullable /* = core::String? */
+static extension-type-member method SameNullable|constructor#_#new#tearOff(core::String? s) → self::SameNullable% /* erasure=core::String?, declared=! */
   return self::SameNullable|constructor#(s);
-static extension-type-member method SameGeneric|constructor#<T extends core::Object? = dynamic>(self::SameGeneric|constructor#::T% s) → self::SameGeneric<self::SameGeneric|constructor#::T%> /* = self::SameGeneric|constructor#::T% */ {
-  lowered final self::SameGeneric<self::SameGeneric|constructor#::T%> /* = self::SameGeneric|constructor#::T% */ #this = s;
+static extension-type-member method SameGeneric|constructor#<T extends core::Object? = dynamic>(self::SameGeneric|constructor#::T% s) → self::SameGeneric<self::SameGeneric|constructor#::T%>% /* erasure=self::SameGeneric|constructor#::T%, declared=! */ {
+  lowered final self::SameGeneric<self::SameGeneric|constructor#::T%>% /* erasure=self::SameGeneric|constructor#::T%, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method SameGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::SameGeneric|constructor#_#new#tearOff::T% s) → self::SameGeneric<self::SameGeneric|constructor#_#new#tearOff::T%> /* = self::SameGeneric|constructor#_#new#tearOff::T% */
+static extension-type-member method SameGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::SameGeneric|constructor#_#new#tearOff::T% s) → self::SameGeneric<self::SameGeneric|constructor#_#new#tearOff::T%>% /* erasure=self::SameGeneric|constructor#_#new#tearOff::T%, declared=! */
   return self::SameGeneric|constructor#<self::SameGeneric|constructor#_#new#tearOff::T%>(s);
 static method sameLibrary() → dynamic {
-  self::SameString /* = core::String */ x0 = #C1;
+  self::SameString% /* erasure=core::String, declared=! */ x0 = #C1;
   self::sameString("hello", x0);
-  self::SameString /* = core::String */ x1 = #C2;
+  self::SameString% /* erasure=core::String, declared=! */ x1 = #C2;
   self::sameString("hello world", x1);
-  has-declared-initializer self::SameNullable /* = core::String? */ y0 = #C3;
+  has-declared-initializer self::SameNullable% /* erasure=core::String?, declared=! */ y0 = #C3;
   self::sameNullable(null, y0);
-  self::SameNullable /* = core::String? */ y1 = #C1;
+  self::SameNullable% /* erasure=core::String?, declared=! */ y1 = #C1;
   self::sameNullable("hello", y1);
-  self::SameGeneric<core::String> /* = core::String */ z0 = #C1;
+  self::SameGeneric<core::String>% /* erasure=core::String, declared=! */ z0 = #C1;
   self::sameGeneric<core::String>("hello", z0);
-  has-declared-initializer self::SameGeneric<core::String?> /* = core::String? */ z1 = #C3;
+  has-declared-initializer self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ z1 = #C3;
   self::sameGeneric<core::String?>(null, z1);
-  self::SameGeneric<core::String?> /* = core::String? */ z2 = #C1;
+  self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ z2 = #C1;
   self::sameGeneric<core::String?>("hello", z2);
 }
-static method sameString(dynamic expected, self::SameString /* = core::String */ es) → void {
+static method sameString(dynamic expected, self::SameString% /* erasure=core::String, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method sameNullable(dynamic expected, self::SameNullable /* = core::String? */ es) → void {
+static method sameNullable(dynamic expected, self::SameNullable% /* erasure=core::String?, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method sameGeneric<T extends core::Object? = dynamic>(dynamic expected, self::SameGeneric<self::sameGeneric::T%> /* = self::sameGeneric::T% */ es) → void {
+static method sameGeneric<T extends core::Object? = dynamic>(dynamic expected, self::SameGeneric<self::sameGeneric::T%>% /* erasure=self::sameGeneric::T%, declared=! */ es) → void {
   self::expect(expected, es);
 }
 static method otherLibrary() → dynamic {
-  #lib1::ExtString /* = core::String */ x0 = #C1;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x0 = #C1;
   self::extString("hello", x0);
-  #lib1::ExtString /* = core::String */ x1 = #C2;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x1 = #C2;
   self::extString("hello world", x1);
-  has-declared-initializer #lib1::ExtNullable /* = core::String? */ y0 = #C3;
+  has-declared-initializer #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y0 = #C3;
   self::extNullable(null, y0);
-  #lib1::ExtNullable /* = core::String? */ y1 = #C1;
+  #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y1 = #C1;
   self::extNullable("hello", y1);
-  #lib1::ExtGeneric<core::String> /* = core::String */ z0 = #C1;
+  #lib1::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ z0 = #C1;
   self::extGeneric<core::String>("hello", z0);
-  has-declared-initializer #lib1::ExtGeneric<core::String?> /* = core::String? */ z1 = #C3;
+  has-declared-initializer #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z1 = #C3;
   self::extGeneric<core::String?>(null, z1);
-  #lib1::ExtGeneric<core::String?> /* = core::String? */ z2 = #C1;
+  #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z2 = #C1;
   self::extGeneric<core::String?>("hello", z2);
 }
 static method imported() → dynamic {
-  #lib1::ExtString /* = core::String */ x0 = #C1;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x0 = #C1;
   self::extString("hello", x0);
-  #lib1::ExtString /* = core::String */ x1 = #C2;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x1 = #C2;
   self::extString("hello world", x1);
-  has-declared-initializer #lib1::ExtNullable /* = core::String? */ y0 = #C3;
+  has-declared-initializer #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y0 = #C3;
   self::extNullable(null, y0);
-  #lib1::ExtNullable /* = core::String? */ y1 = #C1;
+  #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y1 = #C1;
   self::extNullable("hello", y1);
-  #lib1::ExtGeneric<core::String> /* = core::String */ z0 = #C1;
+  #lib1::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ z0 = #C1;
   self::extGeneric<core::String>("hello", z0);
-  has-declared-initializer #lib1::ExtGeneric<core::String?> /* = core::String? */ z1 = #C3;
+  has-declared-initializer #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z1 = #C3;
   self::extGeneric<core::String?>(null, z1);
-  #lib1::ExtGeneric<core::String?> /* = core::String? */ z2 = #C1;
+  #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z2 = #C1;
   self::extGeneric<core::String?>("hello", z2);
 }
-static method extString(dynamic expected, #lib1::ExtString /* = core::String */ es) → void {
+static method extString(dynamic expected, #lib1::ExtString% /* erasure=core::String, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method extNullable(dynamic expected, #lib1::ExtNullable /* = core::String? */ es) → void {
+static method extNullable(dynamic expected, #lib1::ExtNullable% /* erasure=core::String?, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method extGeneric<T extends core::Object? = dynamic>(dynamic expected, #lib1::ExtGeneric<self::extGeneric::T%> /* = self::extGeneric::T% */ es) → void {
+static method extGeneric<T extends core::Object? = dynamic>(dynamic expected, #lib1::ExtGeneric<self::extGeneric::T%>% /* erasure=self::extGeneric::T%, declared=! */ es) → void {
   self::expect(expected, es);
 }
 static method main() → dynamic {
@@ -156,36 +156,36 @@ extension type ExtGeneric<T extends core::Object? = dynamic>(T% s) {
   constructor • = self2::ExtGeneric|constructor#;
   constructor tearoff • = self2::ExtGeneric|constructor#_#new#tearOff;
 }
-static const field self2::ExtString /* = core::String */ libString0 = #C1;
-static const field self2::ExtString /* = core::String */ libString1 = #C2;
-static const field self2::ExtNullable /* = core::String? */ libNullable0 = #C3;
-static const field self2::ExtNullable /* = core::String? */ libNullable1 = #C1;
-static const field self2::ExtGeneric<core::String> /* = core::String */ libGeneric0 = #C1;
-static const field self2::ExtGeneric<core::String?> /* = core::String? */ libGeneric1 = #C3;
-static const field self2::ExtGeneric<core::String?> /* = core::String? */ libGeneric2 = #C1;
-static extension-type-member method ExtString|constructor#(core::String s) → self2::ExtString /* = core::String */ {
-  lowered final self2::ExtString /* = core::String */ #this = s;
+static const field self2::ExtString% /* erasure=core::String, declared=! */ libString0 = #C1;
+static const field self2::ExtString% /* erasure=core::String, declared=! */ libString1 = #C2;
+static const field self2::ExtNullable% /* erasure=core::String?, declared=! */ libNullable0 = #C3;
+static const field self2::ExtNullable% /* erasure=core::String?, declared=! */ libNullable1 = #C1;
+static const field self2::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ libGeneric0 = #C1;
+static const field self2::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ libGeneric1 = #C3;
+static const field self2::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ libGeneric2 = #C1;
+static extension-type-member method ExtString|constructor#(core::String s) → self2::ExtString% /* erasure=core::String, declared=! */ {
+  lowered final self2::ExtString% /* erasure=core::String, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method ExtString|constructor#_#new#tearOff(core::String s) → self2::ExtString /* = core::String */
+static extension-type-member method ExtString|constructor#_#new#tearOff(core::String s) → self2::ExtString% /* erasure=core::String, declared=! */
   return self2::ExtString|constructor#(s);
-static extension-type-member method ExtString|constructor#named(core::String s) → self2::ExtString /* = core::String */ {
-  lowered final self2::ExtString /* = core::String */ #this = "${s} world";
+static extension-type-member method ExtString|constructor#named(core::String s) → self2::ExtString% /* erasure=core::String, declared=! */ {
+  lowered final self2::ExtString% /* erasure=core::String, declared=! */ #this = "${s} world";
   return #this;
 }
-static extension-type-member method ExtString|constructor#_#named#tearOff(core::String s) → self2::ExtString /* = core::String */
+static extension-type-member method ExtString|constructor#_#named#tearOff(core::String s) → self2::ExtString% /* erasure=core::String, declared=! */
   return self2::ExtString|constructor#named(s);
-static extension-type-member method ExtNullable|constructor#(core::String? s) → self2::ExtNullable /* = core::String? */ {
-  lowered final self2::ExtNullable /* = core::String? */ #this = s;
+static extension-type-member method ExtNullable|constructor#(core::String? s) → self2::ExtNullable% /* erasure=core::String?, declared=! */ {
+  lowered final self2::ExtNullable% /* erasure=core::String?, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method ExtNullable|constructor#_#new#tearOff(core::String? s) → self2::ExtNullable /* = core::String? */
+static extension-type-member method ExtNullable|constructor#_#new#tearOff(core::String? s) → self2::ExtNullable% /* erasure=core::String?, declared=! */
   return self2::ExtNullable|constructor#(s);
-static extension-type-member method ExtGeneric|constructor#<T extends core::Object? = dynamic>(self2::ExtGeneric|constructor#::T% s) → self2::ExtGeneric<self2::ExtGeneric|constructor#::T%> /* = self2::ExtGeneric|constructor#::T% */ {
-  lowered final self2::ExtGeneric<self2::ExtGeneric|constructor#::T%> /* = self2::ExtGeneric|constructor#::T% */ #this = s;
+static extension-type-member method ExtGeneric|constructor#<T extends core::Object? = dynamic>(self2::ExtGeneric|constructor#::T% s) → self2::ExtGeneric<self2::ExtGeneric|constructor#::T%>% /* erasure=self2::ExtGeneric|constructor#::T%, declared=! */ {
+  lowered final self2::ExtGeneric<self2::ExtGeneric|constructor#::T%>% /* erasure=self2::ExtGeneric|constructor#::T%, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method ExtGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self2::ExtGeneric|constructor#_#new#tearOff::T% s) → self2::ExtGeneric<self2::ExtGeneric|constructor#_#new#tearOff::T%> /* = self2::ExtGeneric|constructor#_#new#tearOff::T% */
+static extension-type-member method ExtGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self2::ExtGeneric|constructor#_#new#tearOff::T% s) → self2::ExtGeneric<self2::ExtGeneric|constructor#_#new#tearOff::T%>% /* erasure=self2::ExtGeneric|constructor#_#new#tearOff::T%, declared=! */
   return self2::ExtGeneric|constructor#<self2::ExtGeneric|constructor#_#new#tearOff::T%>(s);
 
 constants  {

pkg/front_end/testcases/dartdevc/extension_types/issue54008/main.dart.strong.transformed.expect

@@ -21,108 +21,108 @@ extension type SameGeneric<T extends core::Object? = dynamic>(T% s) {
   constructor • = self::SameGeneric|constructor#;
   constructor tearoff • = self::SameGeneric|constructor#_#new#tearOff;
 }
-static const field self::SameString /* = core::String */ sameString0 = #C1;
-static const field self::SameString /* = core::String */ sameString1 = #C2;
-static const field self::SameNullable /* = core::String? */ sameNullable0 = #C3;
-static const field self::SameNullable /* = core::String? */ sameNullable1 = #C1;
-static const field self::SameGeneric<core::String> /* = core::String */ sameGeneric0 = #C1;
-static const field self::SameGeneric<core::String?> /* = core::String? */ sameGeneric1 = #C3;
-static const field self::SameGeneric<core::String?> /* = core::String? */ sameGeneric2 = #C1;
-static const field #lib1::ExtString /* = core::String */ valString0 = #C1;
-static const field #lib1::ExtString /* = core::String */ valString1 = #C2;
-static const field #lib1::ExtNullable /* = core::String? */ valNullable0 = #C3;
-static const field #lib1::ExtNullable /* = core::String? */ valNullable1 = #C1;
-static const field #lib1::ExtGeneric<core::String> /* = core::String */ valGeneric0 = #C1;
-static const field #lib1::ExtGeneric<core::String?> /* = core::String? */ valGeneric1 = #C3;
-static const field #lib1::ExtGeneric<core::String?> /* = core::String? */ valGeneric2 = #C1;
-static extension-type-member method SameString|constructor#(core::String s) → self::SameString /* = core::String */ {
-  lowered final self::SameString /* = core::String */ #this = s;
+static const field self::SameString% /* erasure=core::String, declared=! */ sameString0 = #C1;
+static const field self::SameString% /* erasure=core::String, declared=! */ sameString1 = #C2;
+static const field self::SameNullable% /* erasure=core::String?, declared=! */ sameNullable0 = #C3;
+static const field self::SameNullable% /* erasure=core::String?, declared=! */ sameNullable1 = #C1;
+static const field self::SameGeneric<core::String>% /* erasure=core::String, declared=! */ sameGeneric0 = #C1;
+static const field self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ sameGeneric1 = #C3;
+static const field self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ sameGeneric2 = #C1;
+static const field #lib1::ExtString% /* erasure=core::String, declared=! */ valString0 = #C1;
+static const field #lib1::ExtString% /* erasure=core::String, declared=! */ valString1 = #C2;
+static const field #lib1::ExtNullable% /* erasure=core::String?, declared=! */ valNullable0 = #C3;
+static const field #lib1::ExtNullable% /* erasure=core::String?, declared=! */ valNullable1 = #C1;
+static const field #lib1::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ valGeneric0 = #C1;
+static const field #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ valGeneric1 = #C3;
+static const field #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ valGeneric2 = #C1;
+static extension-type-member method SameString|constructor#(core::String s) → self::SameString% /* erasure=core::String, declared=! */ {
+  lowered final self::SameString% /* erasure=core::String, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method SameString|constructor#_#new#tearOff(core::String s) → self::SameString /* = core::String */
+static extension-type-member method SameString|constructor#_#new#tearOff(core::String s) → self::SameString% /* erasure=core::String, declared=! */
   return self::SameString|constructor#(s);
-static extension-type-member method SameString|constructor#named(core::String s) → self::SameString /* = core::String */ {
-  lowered final self::SameString /* = core::String */ #this = "${s} world";
+static extension-type-member method SameString|constructor#named(core::String s) → self::SameString% /* erasure=core::String, declared=! */ {
+  lowered final self::SameString% /* erasure=core::String, declared=! */ #this = "${s} world";
   return #this;
 }
-static extension-type-member method SameString|constructor#_#named#tearOff(core::String s) → self::SameString /* = core::String */
+static extension-type-member method SameString|constructor#_#named#tearOff(core::String s) → self::SameString% /* erasure=core::String, declared=! */
   return self::SameString|constructor#named(s);
-static extension-type-member method SameNullable|constructor#(core::String? s) → self::SameNullable /* = core::String? */ {
-  lowered final self::SameNullable /* = core::String? */ #this = s;
+static extension-type-member method SameNullable|constructor#(core::String? s) → self::SameNullable% /* erasure=core::String?, declared=! */ {
+  lowered final self::SameNullable% /* erasure=core::String?, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method SameNullable|constructor#_#new#tearOff(core::String? s) → self::SameNullable /* = core::String? */
+static extension-type-member method SameNullable|constructor#_#new#tearOff(core::String? s) → self::SameNullable% /* erasure=core::String?, declared=! */
   return self::SameNullable|constructor#(s);
-static extension-type-member method SameGeneric|constructor#<T extends core::Object? = dynamic>(self::SameGeneric|constructor#::T% s) → self::SameGeneric<self::SameGeneric|constructor#::T%> /* = self::SameGeneric|constructor#::T% */ {
-  lowered final self::SameGeneric<self::SameGeneric|constructor#::T%> /* = self::SameGeneric|constructor#::T% */ #this = s;
+static extension-type-member method SameGeneric|constructor#<T extends core::Object? = dynamic>(self::SameGeneric|constructor#::T% s) → self::SameGeneric<self::SameGeneric|constructor#::T%>% /* erasure=self::SameGeneric|constructor#::T%, declared=! */ {
+  lowered final self::SameGeneric<self::SameGeneric|constructor#::T%>% /* erasure=self::SameGeneric|constructor#::T%, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method SameGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::SameGeneric|constructor#_#new#tearOff::T% s) → self::SameGeneric<self::SameGeneric|constructor#_#new#tearOff::T%> /* = self::SameGeneric|constructor#_#new#tearOff::T% */
+static extension-type-member method SameGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::SameGeneric|constructor#_#new#tearOff::T% s) → self::SameGeneric<self::SameGeneric|constructor#_#new#tearOff::T%>% /* erasure=self::SameGeneric|constructor#_#new#tearOff::T%, declared=! */
   return self::SameGeneric|constructor#<self::SameGeneric|constructor#_#new#tearOff::T%>(s);
 static method sameLibrary() → dynamic {
-  self::SameString /* = core::String */ x0 = #C1;
+  self::SameString% /* erasure=core::String, declared=! */ x0 = #C1;
   self::sameString("hello", x0);
-  self::SameString /* = core::String */ x1 = #C2;
+  self::SameString% /* erasure=core::String, declared=! */ x1 = #C2;
   self::sameString("hello world", x1);
-  has-declared-initializer self::SameNullable /* = core::String? */ y0 = #C3;
+  has-declared-initializer self::SameNullable% /* erasure=core::String?, declared=! */ y0 = #C3;
   self::sameNullable(null, y0);
-  self::SameNullable /* = core::String? */ y1 = #C1;
+  self::SameNullable% /* erasure=core::String?, declared=! */ y1 = #C1;
   self::sameNullable("hello", y1);
-  self::SameGeneric<core::String> /* = core::String */ z0 = #C1;
+  self::SameGeneric<core::String>% /* erasure=core::String, declared=! */ z0 = #C1;
   self::sameGeneric<core::String>("hello", z0);
-  has-declared-initializer self::SameGeneric<core::String?> /* = core::String? */ z1 = #C3;
+  has-declared-initializer self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ z1 = #C3;
   self::sameGeneric<core::String?>(null, z1);
-  self::SameGeneric<core::String?> /* = core::String? */ z2 = #C1;
+  self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ z2 = #C1;
   self::sameGeneric<core::String?>("hello", z2);
 }
-static method sameString(dynamic expected, self::SameString /* = core::String */ es) → void {
+static method sameString(dynamic expected, self::SameString% /* erasure=core::String, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method sameNullable(dynamic expected, self::SameNullable /* = core::String? */ es) → void {
+static method sameNullable(dynamic expected, self::SameNullable% /* erasure=core::String?, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method sameGeneric<T extends core::Object? = dynamic>(dynamic expected, self::SameGeneric<self::sameGeneric::T%> /* = self::sameGeneric::T% */ es) → void {
+static method sameGeneric<T extends core::Object? = dynamic>(dynamic expected, self::SameGeneric<self::sameGeneric::T%>% /* erasure=self::sameGeneric::T%, declared=! */ es) → void {
   self::expect(expected, es);
 }
 static method otherLibrary() → dynamic {
-  #lib1::ExtString /* = core::String */ x0 = #C1;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x0 = #C1;
   self::extString("hello", x0);
-  #lib1::ExtString /* = core::String */ x1 = #C2;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x1 = #C2;
   self::extString("hello world", x1);
-  has-declared-initializer #lib1::ExtNullable /* = core::String? */ y0 = #C3;
+  has-declared-initializer #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y0 = #C3;
   self::extNullable(null, y0);
-  #lib1::ExtNullable /* = core::String? */ y1 = #C1;
+  #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y1 = #C1;
   self::extNullable("hello", y1);
-  #lib1::ExtGeneric<core::String> /* = core::String */ z0 = #C1;
+  #lib1::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ z0 = #C1;
   self::extGeneric<core::String>("hello", z0);
-  has-declared-initializer #lib1::ExtGeneric<core::String?> /* = core::String? */ z1 = #C3;
+  has-declared-initializer #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z1 = #C3;
   self::extGeneric<core::String?>(null, z1);
-  #lib1::ExtGeneric<core::String?> /* = core::String? */ z2 = #C1;
+  #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z2 = #C1;
   self::extGeneric<core::String?>("hello", z2);
 }
 static method imported() → dynamic {
-  #lib1::ExtString /* = core::String */ x0 = #C1;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x0 = #C1;
   self::extString("hello", x0);
-  #lib1::ExtString /* = core::String */ x1 = #C2;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x1 = #C2;
   self::extString("hello world", x1);
-  has-declared-initializer #lib1::ExtNullable /* = core::String? */ y0 = #C3;
+  has-declared-initializer #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y0 = #C3;
   self::extNullable(null, y0);
-  #lib1::ExtNullable /* = core::String? */ y1 = #C1;
+  #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y1 = #C1;
   self::extNullable("hello", y1);
-  #lib1::ExtGeneric<core::String> /* = core::String */ z0 = #C1;
+  #lib1::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ z0 = #C1;
   self::extGeneric<core::String>("hello", z0);
-  has-declared-initializer #lib1::ExtGeneric<core::String?> /* = core::String? */ z1 = #C3;
+  has-declared-initializer #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z1 = #C3;
   self::extGeneric<core::String?>(null, z1);
-  #lib1::ExtGeneric<core::String?> /* = core::String? */ z2 = #C1;
+  #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z2 = #C1;
   self::extGeneric<core::String?>("hello", z2);
 }
-static method extString(dynamic expected, #lib1::ExtString /* = core::String */ es) → void {
+static method extString(dynamic expected, #lib1::ExtString% /* erasure=core::String, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method extNullable(dynamic expected, #lib1::ExtNullable /* = core::String? */ es) → void {
+static method extNullable(dynamic expected, #lib1::ExtNullable% /* erasure=core::String?, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method extGeneric<T extends core::Object? = dynamic>(dynamic expected, #lib1::ExtGeneric<self::extGeneric::T%> /* = self::extGeneric::T% */ es) → void {
+static method extGeneric<T extends core::Object? = dynamic>(dynamic expected, #lib1::ExtGeneric<self::extGeneric::T%>% /* erasure=self::extGeneric::T%, declared=! */ es) → void {
   self::expect(expected, es);
 }
 static method main() → dynamic {
@@ -156,36 +156,36 @@ extension type ExtGeneric<T extends core::Object? = dynamic>(T% s) {
   constructor • = self2::ExtGeneric|constructor#;
   constructor tearoff • = self2::ExtGeneric|constructor#_#new#tearOff;
 }
-static const field self2::ExtString /* = core::String */ libString0 = #C1;
-static const field self2::ExtString /* = core::String */ libString1 = #C2;
-static const field self2::ExtNullable /* = core::String? */ libNullable0 = #C3;
-static const field self2::ExtNullable /* = core::String? */ libNullable1 = #C1;
-static const field self2::ExtGeneric<core::String> /* = core::String */ libGeneric0 = #C1;
-static const field self2::ExtGeneric<core::String?> /* = core::String? */ libGeneric1 = #C3;
-static const field self2::ExtGeneric<core::String?> /* = core::String? */ libGeneric2 = #C1;
-static extension-type-member method ExtString|constructor#(core::String s) → self2::ExtString /* = core::String */ {
-  lowered final self2::ExtString /* = core::String */ #this = s;
+static const field self2::ExtString% /* erasure=core::String, declared=! */ libString0 = #C1;
+static const field self2::ExtString% /* erasure=core::String, declared=! */ libString1 = #C2;
+static const field self2::ExtNullable% /* erasure=core::String?, declared=! */ libNullable0 = #C3;
+static const field self2::ExtNullable% /* erasure=core::String?, declared=! */ libNullable1 = #C1;
+static const field self2::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ libGeneric0 = #C1;
+static const field self2::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ libGeneric1 = #C3;
+static const field self2::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ libGeneric2 = #C1;
+static extension-type-member method ExtString|constructor#(core::String s) → self2::ExtString% /* erasure=core::String, declared=! */ {
+  lowered final self2::ExtString% /* erasure=core::String, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method ExtString|constructor#_#new#tearOff(core::String s) → self2::ExtString /* = core::String */
+static extension-type-member method ExtString|constructor#_#new#tearOff(core::String s) → self2::ExtString% /* erasure=core::String, declared=! */
   return self2::ExtString|constructor#(s);
-static extension-type-member method ExtString|constructor#named(core::String s) → self2::ExtString /* = core::String */ {
-  lowered final self2::ExtString /* = core::String */ #this = "${s} world";
+static extension-type-member method ExtString|constructor#named(core::String s) → self2::ExtString% /* erasure=core::String, declared=! */ {
+  lowered final self2::ExtString% /* erasure=core::String, declared=! */ #this = "${s} world";
   return #this;
 }
-static extension-type-member method ExtString|constructor#_#named#tearOff(core::String s) → self2::ExtString /* = core::String */
+static extension-type-member method ExtString|constructor#_#named#tearOff(core::String s) → self2::ExtString% /* erasure=core::String, declared=! */
   return self2::ExtString|constructor#named(s);
-static extension-type-member method ExtNullable|constructor#(core::String? s) → self2::ExtNullable /* = core::String? */ {
-  lowered final self2::ExtNullable /* = core::String? */ #this = s;
+static extension-type-member method ExtNullable|constructor#(core::String? s) → self2::ExtNullable% /* erasure=core::String?, declared=! */ {
+  lowered final self2::ExtNullable% /* erasure=core::String?, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method ExtNullable|constructor#_#new#tearOff(core::String? s) → self2::ExtNullable /* = core::String? */
+static extension-type-member method ExtNullable|constructor#_#new#tearOff(core::String? s) → self2::ExtNullable% /* erasure=core::String?, declared=! */
   return self2::ExtNullable|constructor#(s);
-static extension-type-member method ExtGeneric|constructor#<T extends core::Object? = dynamic>(self2::ExtGeneric|constructor#::T% s) → self2::ExtGeneric<self2::ExtGeneric|constructor#::T%> /* = self2::ExtGeneric|constructor#::T% */ {
-  lowered final self2::ExtGeneric<self2::ExtGeneric|constructor#::T%> /* = self2::ExtGeneric|constructor#::T% */ #this = s;
+static extension-type-member method ExtGeneric|constructor#<T extends core::Object? = dynamic>(self2::ExtGeneric|constructor#::T% s) → self2::ExtGeneric<self2::ExtGeneric|constructor#::T%>% /* erasure=self2::ExtGeneric|constructor#::T%, declared=! */ {
+  lowered final self2::ExtGeneric<self2::ExtGeneric|constructor#::T%>% /* erasure=self2::ExtGeneric|constructor#::T%, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method ExtGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self2::ExtGeneric|constructor#_#new#tearOff::T% s) → self2::ExtGeneric<self2::ExtGeneric|constructor#_#new#tearOff::T%> /* = self2::ExtGeneric|constructor#_#new#tearOff::T% */
+static extension-type-member method ExtGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self2::ExtGeneric|constructor#_#new#tearOff::T% s) → self2::ExtGeneric<self2::ExtGeneric|constructor#_#new#tearOff::T%>% /* erasure=self2::ExtGeneric|constructor#_#new#tearOff::T%, declared=! */
   return self2::ExtGeneric|constructor#<self2::ExtGeneric|constructor#_#new#tearOff::T%>(s);
 
 constants  {

pkg/front_end/testcases/dartdevc/extension_types/issue54008/main.dart.weak.expect

@@ -21,108 +21,108 @@ extension type SameGeneric<T extends core::Object? = dynamic>(T% s) {
   constructor • = self::SameGeneric|constructor#;
   constructor tearoff • = self::SameGeneric|constructor#_#new#tearOff;
 }
-static const field self::SameString /* = core::String */ sameString0 = #C1;
-static const field self::SameString /* = core::String */ sameString1 = #C2;
-static const field self::SameNullable /* = core::String? */ sameNullable0 = #C3;
-static const field self::SameNullable /* = core::String? */ sameNullable1 = #C1;
-static const field self::SameGeneric<core::String> /* = core::String */ sameGeneric0 = #C1;
-static const field self::SameGeneric<core::String?> /* = core::String? */ sameGeneric1 = #C3;
-static const field self::SameGeneric<core::String?> /* = core::String? */ sameGeneric2 = #C1;
-static const field #lib1::ExtString /* = core::String */ valString0 = #C1;
-static const field #lib1::ExtString /* = core::String */ valString1 = #C2;
-static const field #lib1::ExtNullable /* = core::String? */ valNullable0 = #C3;
-static const field #lib1::ExtNullable /* = core::String? */ valNullable1 = #C1;
-static const field #lib1::ExtGeneric<core::String> /* = core::String */ valGeneric0 = #C1;
-static const field #lib1::ExtGeneric<core::String?> /* = core::String? */ valGeneric1 = #C3;
-static const field #lib1::ExtGeneric<core::String?> /* = core::String? */ valGeneric2 = #C1;
-static extension-type-member method SameString|constructor#(core::String s) → self::SameString /* = core::String */ {
-  lowered final self::SameString /* = core::String */ #this = s;
+static const field self::SameString% /* erasure=core::String, declared=! */ sameString0 = #C1;
+static const field self::SameString% /* erasure=core::String, declared=! */ sameString1 = #C2;
+static const field self::SameNullable% /* erasure=core::String?, declared=! */ sameNullable0 = #C3;
+static const field self::SameNullable% /* erasure=core::String?, declared=! */ sameNullable1 = #C1;
+static const field self::SameGeneric<core::String>% /* erasure=core::String, declared=! */ sameGeneric0 = #C1;
+static const field self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ sameGeneric1 = #C3;
+static const field self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ sameGeneric2 = #C1;
+static const field #lib1::ExtString% /* erasure=core::String, declared=! */ valString0 = #C1;
+static const field #lib1::ExtString% /* erasure=core::String, declared=! */ valString1 = #C2;
+static const field #lib1::ExtNullable% /* erasure=core::String?, declared=! */ valNullable0 = #C3;
+static const field #lib1::ExtNullable% /* erasure=core::String?, declared=! */ valNullable1 = #C1;
+static const field #lib1::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ valGeneric0 = #C1;
+static const field #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ valGeneric1 = #C3;
+static const field #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ valGeneric2 = #C1;
+static extension-type-member method SameString|constructor#(core::String s) → self::SameString% /* erasure=core::String, declared=! */ {
+  lowered final self::SameString% /* erasure=core::String, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method SameString|constructor#_#new#tearOff(core::String s) → self::SameString /* = core::String */
+static extension-type-member method SameString|constructor#_#new#tearOff(core::String s) → self::SameString% /* erasure=core::String, declared=! */
   return self::SameString|constructor#(s);
-static extension-type-member method SameString|constructor#named(core::String s) → self::SameString /* = core::String */ {
-  lowered final self::SameString /* = core::String */ #this = "${s} world";
+static extension-type-member method SameString|constructor#named(core::String s) → self::SameString% /* erasure=core::String, declared=! */ {
+  lowered final self::SameString% /* erasure=core::String, declared=! */ #this = "${s} world";
   return #this;
 }
-static extension-type-member method SameString|constructor#_#named#tearOff(core::String s) → self::SameString /* = core::String */
+static extension-type-member method SameString|constructor#_#named#tearOff(core::String s) → self::SameString% /* erasure=core::String, declared=! */
   return self::SameString|constructor#named(s);
-static extension-type-member method SameNullable|constructor#(core::String? s) → self::SameNullable /* = core::String? */ {
-  lowered final self::SameNullable /* = core::String? */ #this = s;
+static extension-type-member method SameNullable|constructor#(core::String? s) → self::SameNullable% /* erasure=core::String?, declared=! */ {
+  lowered final self::SameNullable% /* erasure=core::String?, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method SameNullable|constructor#_#new#tearOff(core::String? s) → self::SameNullable /* = core::String? */
+static extension-type-member method SameNullable|constructor#_#new#tearOff(core::String? s) → self::SameNullable% /* erasure=core::String?, declared=! */
   return self::SameNullable|constructor#(s);
-static extension-type-member method SameGeneric|constructor#<T extends core::Object? = dynamic>(self::SameGeneric|constructor#::T% s) → self::SameGeneric<self::SameGeneric|constructor#::T%> /* = self::SameGeneric|constructor#::T% */ {
-  lowered final self::SameGeneric<self::SameGeneric|constructor#::T%> /* = self::SameGeneric|constructor#::T% */ #this = s;
+static extension-type-member method SameGeneric|constructor#<T extends core::Object? = dynamic>(self::SameGeneric|constructor#::T% s) → self::SameGeneric<self::SameGeneric|constructor#::T%>% /* erasure=self::SameGeneric|constructor#::T%, declared=! */ {
+  lowered final self::SameGeneric<self::SameGeneric|constructor#::T%>% /* erasure=self::SameGeneric|constructor#::T%, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method SameGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::SameGeneric|constructor#_#new#tearOff::T% s) → self::SameGeneric<self::SameGeneric|constructor#_#new#tearOff::T%> /* = self::SameGeneric|constructor#_#new#tearOff::T% */
+static extension-type-member method SameGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::SameGeneric|constructor#_#new#tearOff::T% s) → self::SameGeneric<self::SameGeneric|constructor#_#new#tearOff::T%>% /* erasure=self::SameGeneric|constructor#_#new#tearOff::T%, declared=! */
   return self::SameGeneric|constructor#<self::SameGeneric|constructor#_#new#tearOff::T%>(s);
 static method sameLibrary() → dynamic {
-  self::SameString /* = core::String */ x0 = #C1;
+  self::SameString% /* erasure=core::String, declared=! */ x0 = #C1;
   self::sameString("hello", x0);
-  self::SameString /* = core::String */ x1 = #C2;
+  self::SameString% /* erasure=core::String, declared=! */ x1 = #C2;
   self::sameString("hello world", x1);
-  has-declared-initializer self::SameNullable /* = core::String? */ y0 = #C3;
+  has-declared-initializer self::SameNullable% /* erasure=core::String?, declared=! */ y0 = #C3;
   self::sameNullable(null, y0);
-  self::SameNullable /* = core::String? */ y1 = #C1;
+  self::SameNullable% /* erasure=core::String?, declared=! */ y1 = #C1;
   self::sameNullable("hello", y1);
-  self::SameGeneric<core::String> /* = core::String */ z0 = #C1;
+  self::SameGeneric<core::String>% /* erasure=core::String, declared=! */ z0 = #C1;
   self::sameGeneric<core::String>("hello", z0);
-  has-declared-initializer self::SameGeneric<core::String?> /* = core::String? */ z1 = #C3;
+  has-declared-initializer self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ z1 = #C3;
   self::sameGeneric<core::String?>(null, z1);
-  self::SameGeneric<core::String?> /* = core::String? */ z2 = #C1;
+  self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ z2 = #C1;
   self::sameGeneric<core::String?>("hello", z2);
 }
-static method sameString(dynamic expected, self::SameString /* = core::String */ es) → void {
+static method sameString(dynamic expected, self::SameString% /* erasure=core::String, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method sameNullable(dynamic expected, self::SameNullable /* = core::String? */ es) → void {
+static method sameNullable(dynamic expected, self::SameNullable% /* erasure=core::String?, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method sameGeneric<T extends core::Object? = dynamic>(dynamic expected, self::SameGeneric<self::sameGeneric::T%> /* = self::sameGeneric::T% */ es) → void {
+static method sameGeneric<T extends core::Object? = dynamic>(dynamic expected, self::SameGeneric<self::sameGeneric::T%>% /* erasure=self::sameGeneric::T%, declared=! */ es) → void {
   self::expect(expected, es);
 }
 static method otherLibrary() → dynamic {
-  #lib1::ExtString /* = core::String */ x0 = #C1;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x0 = #C1;
   self::extString("hello", x0);
-  #lib1::ExtString /* = core::String */ x1 = #C2;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x1 = #C2;
   self::extString("hello world", x1);
-  has-declared-initializer #lib1::ExtNullable /* = core::String? */ y0 = #C3;
+  has-declared-initializer #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y0 = #C3;
   self::extNullable(null, y0);
-  #lib1::ExtNullable /* = core::String? */ y1 = #C1;
+  #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y1 = #C1;
   self::extNullable("hello", y1);
-  #lib1::ExtGeneric<core::String> /* = core::String */ z0 = #C1;
+  #lib1::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ z0 = #C1;
   self::extGeneric<core::String>("hello", z0);
-  has-declared-initializer #lib1::ExtGeneric<core::String?> /* = core::String? */ z1 = #C3;
+  has-declared-initializer #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z1 = #C3;
   self::extGeneric<core::String?>(null, z1);
-  #lib1::ExtGeneric<core::String?> /* = core::String? */ z2 = #C1;
+  #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z2 = #C1;
   self::extGeneric<core::String?>("hello", z2);
 }
 static method imported() → dynamic {
-  #lib1::ExtString /* = core::String */ x0 = #C1;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x0 = #C1;
   self::extString("hello", x0);
-  #lib1::ExtString /* = core::String */ x1 = #C2;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x1 = #C2;
   self::extString("hello world", x1);
-  has-declared-initializer #lib1::ExtNullable /* = core::String? */ y0 = #C3;
+  has-declared-initializer #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y0 = #C3;
   self::extNullable(null, y0);
-  #lib1::ExtNullable /* = core::String? */ y1 = #C1;
+  #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y1 = #C1;
   self::extNullable("hello", y1);
-  #lib1::ExtGeneric<core::String> /* = core::String */ z0 = #C1;
+  #lib1::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ z0 = #C1;
   self::extGeneric<core::String>("hello", z0);
-  has-declared-initializer #lib1::ExtGeneric<core::String?> /* = core::String? */ z1 = #C3;
+  has-declared-initializer #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z1 = #C3;
   self::extGeneric<core::String?>(null, z1);
-  #lib1::ExtGeneric<core::String?> /* = core::String? */ z2 = #C1;
+  #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z2 = #C1;
   self::extGeneric<core::String?>("hello", z2);
 }
-static method extString(dynamic expected, #lib1::ExtString /* = core::String */ es) → void {
+static method extString(dynamic expected, #lib1::ExtString% /* erasure=core::String, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method extNullable(dynamic expected, #lib1::ExtNullable /* = core::String? */ es) → void {
+static method extNullable(dynamic expected, #lib1::ExtNullable% /* erasure=core::String?, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method extGeneric<T extends core::Object? = dynamic>(dynamic expected, #lib1::ExtGeneric<self::extGeneric::T%> /* = self::extGeneric::T% */ es) → void {
+static method extGeneric<T extends core::Object? = dynamic>(dynamic expected, #lib1::ExtGeneric<self::extGeneric::T%>% /* erasure=self::extGeneric::T%, declared=! */ es) → void {
   self::expect(expected, es);
 }
 static method main() → dynamic {
@@ -156,36 +156,36 @@ extension type ExtGeneric<T extends core::Object? = dynamic>(T% s) {
   constructor • = self2::ExtGeneric|constructor#;
   constructor tearoff • = self2::ExtGeneric|constructor#_#new#tearOff;
 }
-static const field self2::ExtString /* = core::String */ libString0 = #C1;
-static const field self2::ExtString /* = core::String */ libString1 = #C2;
-static const field self2::ExtNullable /* = core::String? */ libNullable0 = #C3;
-static const field self2::ExtNullable /* = core::String? */ libNullable1 = #C1;
-static const field self2::ExtGeneric<core::String> /* = core::String */ libGeneric0 = #C1;
-static const field self2::ExtGeneric<core::String?> /* = core::String? */ libGeneric1 = #C3;
-static const field self2::ExtGeneric<core::String?> /* = core::String? */ libGeneric2 = #C1;
-static extension-type-member method ExtString|constructor#(core::String s) → self2::ExtString /* = core::String */ {
-  lowered final self2::ExtString /* = core::String */ #this = s;
+static const field self2::ExtString% /* erasure=core::String, declared=! */ libString0 = #C1;
+static const field self2::ExtString% /* erasure=core::String, declared=! */ libString1 = #C2;
+static const field self2::ExtNullable% /* erasure=core::String?, declared=! */ libNullable0 = #C3;
+static const field self2::ExtNullable% /* erasure=core::String?, declared=! */ libNullable1 = #C1;
+static const field self2::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ libGeneric0 = #C1;
+static const field self2::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ libGeneric1 = #C3;
+static const field self2::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ libGeneric2 = #C1;
+static extension-type-member method ExtString|constructor#(core::String s) → self2::ExtString% /* erasure=core::String, declared=! */ {
+  lowered final self2::ExtString% /* erasure=core::String, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method ExtString|constructor#_#new#tearOff(core::String s) → self2::ExtString /* = core::String */
+static extension-type-member method ExtString|constructor#_#new#tearOff(core::String s) → self2::ExtString% /* erasure=core::String, declared=! */
   return self2::ExtString|constructor#(s);
-static extension-type-member method ExtString|constructor#named(core::String s) → self2::ExtString /* = core::String */ {
-  lowered final self2::ExtString /* = core::String */ #this = "${s} world";
+static extension-type-member method ExtString|constructor#named(core::String s) → self2::ExtString% /* erasure=core::String, declared=! */ {
+  lowered final self2::ExtString% /* erasure=core::String, declared=! */ #this = "${s} world";
   return #this;
 }
-static extension-type-member method ExtString|constructor#_#named#tearOff(core::String s) → self2::ExtString /* = core::String */
+static extension-type-member method ExtString|constructor#_#named#tearOff(core::String s) → self2::ExtString% /* erasure=core::String, declared=! */
   return self2::ExtString|constructor#named(s);
-static extension-type-member method ExtNullable|constructor#(core::String? s) → self2::ExtNullable /* = core::String? */ {
-  lowered final self2::ExtNullable /* = core::String? */ #this = s;
+static extension-type-member method ExtNullable|constructor#(core::String? s) → self2::ExtNullable% /* erasure=core::String?, declared=! */ {
+  lowered final self2::ExtNullable% /* erasure=core::String?, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method ExtNullable|constructor#_#new#tearOff(core::String? s) → self2::ExtNullable /* = core::String? */
+static extension-type-member method ExtNullable|constructor#_#new#tearOff(core::String? s) → self2::ExtNullable% /* erasure=core::String?, declared=! */
   return self2::ExtNullable|constructor#(s);
-static extension-type-member method ExtGeneric|constructor#<T extends core::Object? = dynamic>(self2::ExtGeneric|constructor#::T% s) → self2::ExtGeneric<self2::ExtGeneric|constructor#::T%> /* = self2::ExtGeneric|constructor#::T% */ {
-  lowered final self2::ExtGeneric<self2::ExtGeneric|constructor#::T%> /* = self2::ExtGeneric|constructor#::T% */ #this = s;
+static extension-type-member method ExtGeneric|constructor#<T extends core::Object? = dynamic>(self2::ExtGeneric|constructor#::T% s) → self2::ExtGeneric<self2::ExtGeneric|constructor#::T%>% /* erasure=self2::ExtGeneric|constructor#::T%, declared=! */ {
+  lowered final self2::ExtGeneric<self2::ExtGeneric|constructor#::T%>% /* erasure=self2::ExtGeneric|constructor#::T%, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method ExtGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self2::ExtGeneric|constructor#_#new#tearOff::T% s) → self2::ExtGeneric<self2::ExtGeneric|constructor#_#new#tearOff::T%> /* = self2::ExtGeneric|constructor#_#new#tearOff::T% */
+static extension-type-member method ExtGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self2::ExtGeneric|constructor#_#new#tearOff::T% s) → self2::ExtGeneric<self2::ExtGeneric|constructor#_#new#tearOff::T%>% /* erasure=self2::ExtGeneric|constructor#_#new#tearOff::T%, declared=! */
   return self2::ExtGeneric|constructor#<self2::ExtGeneric|constructor#_#new#tearOff::T%>(s);
 
 constants  {

pkg/front_end/testcases/dartdevc/extension_types/issue54008/main.dart.weak.modular.expect

@@ -21,108 +21,108 @@ extension type SameGeneric<T extends core::Object? = dynamic>(T% s) {
   constructor • = self::SameGeneric|constructor#;
   constructor tearoff • = self::SameGeneric|constructor#_#new#tearOff;
 }
-static const field self::SameString /* = core::String */ sameString0 = #C1;
-static const field self::SameString /* = core::String */ sameString1 = #C2;
-static const field self::SameNullable /* = core::String? */ sameNullable0 = #C3;
-static const field self::SameNullable /* = core::String? */ sameNullable1 = #C1;
-static const field self::SameGeneric<core::String> /* = core::String */ sameGeneric0 = #C1;
-static const field self::SameGeneric<core::String?> /* = core::String? */ sameGeneric1 = #C3;
-static const field self::SameGeneric<core::String?> /* = core::String? */ sameGeneric2 = #C1;
-static const field #lib1::ExtString /* = core::String */ valString0 = #C1;
-static const field #lib1::ExtString /* = core::String */ valString1 = #C2;
-static const field #lib1::ExtNullable /* = core::String? */ valNullable0 = #C3;
-static const field #lib1::ExtNullable /* = core::String? */ valNullable1 = #C1;
-static const field #lib1::ExtGeneric<core::String> /* = core::String */ valGeneric0 = #C1;
-static const field #lib1::ExtGeneric<core::String?> /* = core::String? */ valGeneric1 = #C3;
-static const field #lib1::ExtGeneric<core::String?> /* = core::String? */ valGeneric2 = #C1;
-static extension-type-member method SameString|constructor#(core::String s) → self::SameString /* = core::String */ {
-  lowered final self::SameString /* = core::String */ #this = s;
+static const field self::SameString% /* erasure=core::String, declared=! */ sameString0 = #C1;
+static const field self::SameString% /* erasure=core::String, declared=! */ sameString1 = #C2;
+static const field self::SameNullable% /* erasure=core::String?, declared=! */ sameNullable0 = #C3;
+static const field self::SameNullable% /* erasure=core::String?, declared=! */ sameNullable1 = #C1;
+static const field self::SameGeneric<core::String>% /* erasure=core::String, declared=! */ sameGeneric0 = #C1;
+static const field self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ sameGeneric1 = #C3;
+static const field self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ sameGeneric2 = #C1;
+static const field #lib1::ExtString% /* erasure=core::String, declared=! */ valString0 = #C1;
+static const field #lib1::ExtString% /* erasure=core::String, declared=! */ valString1 = #C2;
+static const field #lib1::ExtNullable% /* erasure=core::String?, declared=! */ valNullable0 = #C3;
+static const field #lib1::ExtNullable% /* erasure=core::String?, declared=! */ valNullable1 = #C1;
+static const field #lib1::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ valGeneric0 = #C1;
+static const field #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ valGeneric1 = #C3;
+static const field #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ valGeneric2 = #C1;
+static extension-type-member method SameString|constructor#(core::String s) → self::SameString% /* erasure=core::String, declared=! */ {
+  lowered final self::SameString% /* erasure=core::String, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method SameString|constructor#_#new#tearOff(core::String s) → self::SameString /* = core::String */
+static extension-type-member method SameString|constructor#_#new#tearOff(core::String s) → self::SameString% /* erasure=core::String, declared=! */
   return self::SameString|constructor#(s);
-static extension-type-member method SameString|constructor#named(core::String s) → self::SameString /* = core::String */ {
-  lowered final self::SameString /* = core::String */ #this = "${s} world";
+static extension-type-member method SameString|constructor#named(core::String s) → self::SameString% /* erasure=core::String, declared=! */ {
+  lowered final self::SameString% /* erasure=core::String, declared=! */ #this = "${s} world";
   return #this;
 }
-static extension-type-member method SameString|constructor#_#named#tearOff(core::String s) → self::SameString /* = core::String */
+static extension-type-member method SameString|constructor#_#named#tearOff(core::String s) → self::SameString% /* erasure=core::String, declared=! */
   return self::SameString|constructor#named(s);
-static extension-type-member method SameNullable|constructor#(core::String? s) → self::SameNullable /* = core::String? */ {
-  lowered final self::SameNullable /* = core::String? */ #this = s;
+static extension-type-member method SameNullable|constructor#(core::String? s) → self::SameNullable% /* erasure=core::String?, declared=! */ {
+  lowered final self::SameNullable% /* erasure=core::String?, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method SameNullable|constructor#_#new#tearOff(core::String? s) → self::SameNullable /* = core::String? */
+static extension-type-member method SameNullable|constructor#_#new#tearOff(core::String? s) → self::SameNullable% /* erasure=core::String?, declared=! */
   return self::SameNullable|constructor#(s);
-static extension-type-member method SameGeneric|constructor#<T extends core::Object? = dynamic>(self::SameGeneric|constructor#::T% s) → self::SameGeneric<self::SameGeneric|constructor#::T%> /* = self::SameGeneric|constructor#::T% */ {
-  lowered final self::SameGeneric<self::SameGeneric|constructor#::T%> /* = self::SameGeneric|constructor#::T% */ #this = s;
+static extension-type-member method SameGeneric|constructor#<T extends core::Object? = dynamic>(self::SameGeneric|constructor#::T% s) → self::SameGeneric<self::SameGeneric|constructor#::T%>% /* erasure=self::SameGeneric|constructor#::T%, declared=! */ {
+  lowered final self::SameGeneric<self::SameGeneric|constructor#::T%>% /* erasure=self::SameGeneric|constructor#::T%, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method SameGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::SameGeneric|constructor#_#new#tearOff::T% s) → self::SameGeneric<self::SameGeneric|constructor#_#new#tearOff::T%> /* = self::SameGeneric|constructor#_#new#tearOff::T% */
+static extension-type-member method SameGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::SameGeneric|constructor#_#new#tearOff::T% s) → self::SameGeneric<self::SameGeneric|constructor#_#new#tearOff::T%>% /* erasure=self::SameGeneric|constructor#_#new#tearOff::T%, declared=! */
   return self::SameGeneric|constructor#<self::SameGeneric|constructor#_#new#tearOff::T%>(s);
 static method sameLibrary() → dynamic {
-  self::SameString /* = core::String */ x0 = #C1;
+  self::SameString% /* erasure=core::String, declared=! */ x0 = #C1;
   self::sameString("hello", x0);
-  self::SameString /* = core::String */ x1 = #C2;
+  self::SameString% /* erasure=core::String, declared=! */ x1 = #C2;
   self::sameString("hello world", x1);
-  has-declared-initializer self::SameNullable /* = core::String? */ y0 = #C3;
+  has-declared-initializer self::SameNullable% /* erasure=core::String?, declared=! */ y0 = #C3;
   self::sameNullable(null, y0);
-  self::SameNullable /* = core::String? */ y1 = #C1;
+  self::SameNullable% /* erasure=core::String?, declared=! */ y1 = #C1;
   self::sameNullable("hello", y1);
-  self::SameGeneric<core::String> /* = core::String */ z0 = #C1;
+  self::SameGeneric<core::String>% /* erasure=core::String, declared=! */ z0 = #C1;
   self::sameGeneric<core::String>("hello", z0);
-  has-declared-initializer self::SameGeneric<core::String?> /* = core::String? */ z1 = #C3;
+  has-declared-initializer self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ z1 = #C3;
   self::sameGeneric<core::String?>(null, z1);
-  self::SameGeneric<core::String?> /* = core::String? */ z2 = #C1;
+  self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ z2 = #C1;
   self::sameGeneric<core::String?>("hello", z2);
 }
-static method sameString(dynamic expected, self::SameString /* = core::String */ es) → void {
+static method sameString(dynamic expected, self::SameString% /* erasure=core::String, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method sameNullable(dynamic expected, self::SameNullable /* = core::String? */ es) → void {
+static method sameNullable(dynamic expected, self::SameNullable% /* erasure=core::String?, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method sameGeneric<T extends core::Object? = dynamic>(dynamic expected, self::SameGeneric<self::sameGeneric::T%> /* = self::sameGeneric::T% */ es) → void {
+static method sameGeneric<T extends core::Object? = dynamic>(dynamic expected, self::SameGeneric<self::sameGeneric::T%>% /* erasure=self::sameGeneric::T%, declared=! */ es) → void {
   self::expect(expected, es);
 }
 static method otherLibrary() → dynamic {
-  #lib1::ExtString /* = core::String */ x0 = #C1;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x0 = #C1;
   self::extString("hello", x0);
-  #lib1::ExtString /* = core::String */ x1 = #C2;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x1 = #C2;
   self::extString("hello world", x1);
-  has-declared-initializer #lib1::ExtNullable /* = core::String? */ y0 = #C3;
+  has-declared-initializer #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y0 = #C3;
   self::extNullable(null, y0);
-  #lib1::ExtNullable /* = core::String? */ y1 = #C1;
+  #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y1 = #C1;
   self::extNullable("hello", y1);
-  #lib1::ExtGeneric<core::String> /* = core::String */ z0 = #C1;
+  #lib1::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ z0 = #C1;
   self::extGeneric<core::String>("hello", z0);
-  has-declared-initializer #lib1::ExtGeneric<core::String?> /* = core::String? */ z1 = #C3;
+  has-declared-initializer #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z1 = #C3;
   self::extGeneric<core::String?>(null, z1);
-  #lib1::ExtGeneric<core::String?> /* = core::String? */ z2 = #C1;
+  #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z2 = #C1;
   self::extGeneric<core::String?>("hello", z2);
 }
 static method imported() → dynamic {
-  #lib1::ExtString /* = core::String */ x0 = #C1;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x0 = #C1;
   self::extString("hello", x0);
-  #lib1::ExtString /* = core::String */ x1 = #C2;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x1 = #C2;
   self::extString("hello world", x1);
-  has-declared-initializer #lib1::ExtNullable /* = core::String? */ y0 = #C3;
+  has-declared-initializer #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y0 = #C3;
   self::extNullable(null, y0);
-  #lib1::ExtNullable /* = core::String? */ y1 = #C1;
+  #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y1 = #C1;
   self::extNullable("hello", y1);
-  #lib1::ExtGeneric<core::String> /* = core::String */ z0 = #C1;
+  #lib1::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ z0 = #C1;
   self::extGeneric<core::String>("hello", z0);
-  has-declared-initializer #lib1::ExtGeneric<core::String?> /* = core::String? */ z1 = #C3;
+  has-declared-initializer #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z1 = #C3;
   self::extGeneric<core::String?>(null, z1);
-  #lib1::ExtGeneric<core::String?> /* = core::String? */ z2 = #C1;
+  #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z2 = #C1;
   self::extGeneric<core::String?>("hello", z2);
 }
-static method extString(dynamic expected, #lib1::ExtString /* = core::String */ es) → void {
+static method extString(dynamic expected, #lib1::ExtString% /* erasure=core::String, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method extNullable(dynamic expected, #lib1::ExtNullable /* = core::String? */ es) → void {
+static method extNullable(dynamic expected, #lib1::ExtNullable% /* erasure=core::String?, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method extGeneric<T extends core::Object? = dynamic>(dynamic expected, #lib1::ExtGeneric<self::extGeneric::T%> /* = self::extGeneric::T% */ es) → void {
+static method extGeneric<T extends core::Object? = dynamic>(dynamic expected, #lib1::ExtGeneric<self::extGeneric::T%>% /* erasure=self::extGeneric::T%, declared=! */ es) → void {
   self::expect(expected, es);
 }
 static method main() → dynamic {

pkg/front_end/testcases/dartdevc/extension_types/issue54008/main.dart.weak.outline.expect

@@ -22,61 +22,61 @@ extension type SameGeneric<T extends core::Object? = dynamic>(T% s) {
   constructor • = self::SameGeneric|constructor#;
   constructor tearoff • = self::SameGeneric|constructor#_#new#tearOff;
 }
-static const field self::SameString /* = core::String */ sameString0 = const self::SameString|constructor#("hello");
-static const field self::SameString /* = core::String */ sameString1 = const self::SameString|constructor#named("hello");
-static const field self::SameNullable /* = core::String? */ sameNullable0 = const self::SameNullable|constructor#(null);
-static const field self::SameNullable /* = core::String? */ sameNullable1 = const self::SameNullable|constructor#("hello");
-static const field self::SameGeneric<core::String> /* = core::String */ sameGeneric0 = const self::SameGeneric|constructor#<core::String>("hello");
-static const field self::SameGeneric<core::String?> /* = core::String? */ sameGeneric1 = const self::SameGeneric|constructor#<core::String?>(null);
-static const field self::SameGeneric<core::String?> /* = core::String? */ sameGeneric2 = const self::SameGeneric|constructor#<core::String?>("hello");
-static const field mai::ExtString /* = core::String */ valString0 = const mai::ExtString|constructor#("hello");
-static const field mai::ExtString /* = core::String */ valString1 = const mai::ExtString|constructor#named("hello");
-static const field mai::ExtNullable /* = core::String? */ valNullable0 = const mai::ExtNullable|constructor#(null);
-static const field mai::ExtNullable /* = core::String? */ valNullable1 = const mai::ExtNullable|constructor#("hello");
-static const field mai::ExtGeneric<core::String> /* = core::String */ valGeneric0 = const mai::ExtGeneric|constructor#<core::String>("hello");
-static const field mai::ExtGeneric<core::String?> /* = core::String? */ valGeneric1 = const mai::ExtGeneric|constructor#<core::String?>(null);
-static const field mai::ExtGeneric<core::String?> /* = core::String? */ valGeneric2 = const mai::ExtGeneric|constructor#<core::String?>("hello");
-static extension-type-member method SameString|constructor#(core::String s) → self::SameString /* = core::String */ {
-  lowered final self::SameString /* = core::String */ #this = s;
+static const field self::SameString% /* erasure=core::String, declared=! */ sameString0 = const self::SameString|constructor#("hello");
+static const field self::SameString% /* erasure=core::String, declared=! */ sameString1 = const self::SameString|constructor#named("hello");
+static const field self::SameNullable% /* erasure=core::String?, declared=! */ sameNullable0 = const self::SameNullable|constructor#(null);
+static const field self::SameNullable% /* erasure=core::String?, declared=! */ sameNullable1 = const self::SameNullable|constructor#("hello");
+static const field self::SameGeneric<core::String>% /* erasure=core::String, declared=! */ sameGeneric0 = const self::SameGeneric|constructor#<core::String>("hello");
+static const field self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ sameGeneric1 = const self::SameGeneric|constructor#<core::String?>(null);
+static const field self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ sameGeneric2 = const self::SameGeneric|constructor#<core::String?>("hello");
+static const field mai::ExtString% /* erasure=core::String, declared=! */ valString0 = const mai::ExtString|constructor#("hello");
+static const field mai::ExtString% /* erasure=core::String, declared=! */ valString1 = const mai::ExtString|constructor#named("hello");
+static const field mai::ExtNullable% /* erasure=core::String?, declared=! */ valNullable0 = const mai::ExtNullable|constructor#(null);
+static const field mai::ExtNullable% /* erasure=core::String?, declared=! */ valNullable1 = const mai::ExtNullable|constructor#("hello");
+static const field mai::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ valGeneric0 = const mai::ExtGeneric|constructor#<core::String>("hello");
+static const field mai::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ valGeneric1 = const mai::ExtGeneric|constructor#<core::String?>(null);
+static const field mai::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ valGeneric2 = const mai::ExtGeneric|constructor#<core::String?>("hello");
+static extension-type-member method SameString|constructor#(core::String s) → self::SameString% /* erasure=core::String, declared=! */ {
+  lowered final self::SameString% /* erasure=core::String, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method SameString|constructor#_#new#tearOff(core::String s) → self::SameString /* = core::String */
+static extension-type-member method SameString|constructor#_#new#tearOff(core::String s) → self::SameString% /* erasure=core::String, declared=! */
   return self::SameString|constructor#(s);
-static extension-type-member method SameString|constructor#named(core::String s) → self::SameString /* = core::String */ {
-  lowered final self::SameString /* = core::String */ #this = "${s} world";
+static extension-type-member method SameString|constructor#named(core::String s) → self::SameString% /* erasure=core::String, declared=! */ {
+  lowered final self::SameString% /* erasure=core::String, declared=! */ #this = "${s} world";
   return #this;
 }
-static extension-type-member method SameString|constructor#_#named#tearOff(core::String s) → self::SameString /* = core::String */
+static extension-type-member method SameString|constructor#_#named#tearOff(core::String s) → self::SameString% /* erasure=core::String, declared=! */
   return self::SameString|constructor#named(s);
-static extension-type-member method SameNullable|constructor#(core::String? s) → self::SameNullable /* = core::String? */ {
-  lowered final self::SameNullable /* = core::String? */ #this = s;
+static extension-type-member method SameNullable|constructor#(core::String? s) → self::SameNullable% /* erasure=core::String?, declared=! */ {
+  lowered final self::SameNullable% /* erasure=core::String?, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method SameNullable|constructor#_#new#tearOff(core::String? s) → self::SameNullable /* = core::String? */
+static extension-type-member method SameNullable|constructor#_#new#tearOff(core::String? s) → self::SameNullable% /* erasure=core::String?, declared=! */
   return self::SameNullable|constructor#(s);
-static extension-type-member method SameGeneric|constructor#<T extends core::Object? = dynamic>(self::SameGeneric|constructor#::T% s) → self::SameGeneric<self::SameGeneric|constructor#::T%> /* = self::SameGeneric|constructor#::T% */ {
-  lowered final self::SameGeneric<self::SameGeneric|constructor#::T%> /* = self::SameGeneric|constructor#::T% */ #this = s;
+static extension-type-member method SameGeneric|constructor#<T extends core::Object? = dynamic>(self::SameGeneric|constructor#::T% s) → self::SameGeneric<self::SameGeneric|constructor#::T%>% /* erasure=self::SameGeneric|constructor#::T%, declared=! */ {
+  lowered final self::SameGeneric<self::SameGeneric|constructor#::T%>% /* erasure=self::SameGeneric|constructor#::T%, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method SameGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::SameGeneric|constructor#_#new#tearOff::T% s) → self::SameGeneric<self::SameGeneric|constructor#_#new#tearOff::T%> /* = self::SameGeneric|constructor#_#new#tearOff::T% */
+static extension-type-member method SameGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::SameGeneric|constructor#_#new#tearOff::T% s) → self::SameGeneric<self::SameGeneric|constructor#_#new#tearOff::T%>% /* erasure=self::SameGeneric|constructor#_#new#tearOff::T%, declared=! */
   return self::SameGeneric|constructor#<self::SameGeneric|constructor#_#new#tearOff::T%>(s);
 static method sameLibrary() → dynamic
   ;
-static method sameString(dynamic expected, self::SameString /* = core::String */ es) → void
+static method sameString(dynamic expected, self::SameString% /* erasure=core::String, declared=! */ es) → void
   ;
-static method sameNullable(dynamic expected, self::SameNullable /* = core::String? */ es) → void
+static method sameNullable(dynamic expected, self::SameNullable% /* erasure=core::String?, declared=! */ es) → void
   ;
-static method sameGeneric<T extends core::Object? = dynamic>(dynamic expected, self::SameGeneric<self::sameGeneric::T%> /* = self::sameGeneric::T% */ es) → void
+static method sameGeneric<T extends core::Object? = dynamic>(dynamic expected, self::SameGeneric<self::sameGeneric::T%>% /* erasure=self::sameGeneric::T%, declared=! */ es) → void
   ;
 static method otherLibrary() → dynamic
   ;
 static method imported() → dynamic
   ;
-static method extString(dynamic expected, mai::ExtString /* = core::String */ es) → void
+static method extString(dynamic expected, mai::ExtString% /* erasure=core::String, declared=! */ es) → void
   ;
-static method extNullable(dynamic expected, mai::ExtNullable /* = core::String? */ es) → void
+static method extNullable(dynamic expected, mai::ExtNullable% /* erasure=core::String?, declared=! */ es) → void
   ;
-static method extGeneric<T extends core::Object? = dynamic>(dynamic expected, mai::ExtGeneric<self::extGeneric::T%> /* = self::extGeneric::T% */ es) → void
+static method extGeneric<T extends core::Object? = dynamic>(dynamic expected, mai::ExtGeneric<self::extGeneric::T%>% /* erasure=self::extGeneric::T%, declared=! */ es) → void
   ;
 static method main() → dynamic
   ;
@@ -104,36 +104,36 @@ extension type ExtGeneric<T extends core::Object? = dynamic>(T% s) {
   constructor • = mai::ExtGeneric|constructor#;
   constructor tearoff • = mai::ExtGeneric|constructor#_#new#tearOff;
 }
-static const field mai::ExtString /* = core::String */ libString0 = #C1;
-static const field mai::ExtString /* = core::String */ libString1 = #C2;
-static const field mai::ExtNullable /* = core::String? */ libNullable0 = #C3;
-static const field mai::ExtNullable /* = core::String? */ libNullable1 = #C1;
-static const field mai::ExtGeneric<core::String> /* = core::String */ libGeneric0 = #C1;
-static const field mai::ExtGeneric<core::String?> /* = core::String? */ libGeneric1 = #C3;
-static const field mai::ExtGeneric<core::String?> /* = core::String? */ libGeneric2 = #C1;
-static extension-type-member method ExtString|constructor#(core::String s) → mai::ExtString /* = core::String */ {
-  lowered final mai::ExtString /* = core::String */ #this = s;
+static const field mai::ExtString% /* erasure=core::String, declared=! */ libString0 = #C1;
+static const field mai::ExtString% /* erasure=core::String, declared=! */ libString1 = #C2;
+static const field mai::ExtNullable% /* erasure=core::String?, declared=! */ libNullable0 = #C3;
+static const field mai::ExtNullable% /* erasure=core::String?, declared=! */ libNullable1 = #C1;
+static const field mai::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ libGeneric0 = #C1;
+static const field mai::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ libGeneric1 = #C3;
+static const field mai::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ libGeneric2 = #C1;
+static extension-type-member method ExtString|constructor#(core::String s) → mai::ExtString% /* erasure=core::String, declared=! */ {
+  lowered final mai::ExtString% /* erasure=core::String, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method ExtString|constructor#_#new#tearOff(core::String s) → mai::ExtString /* = core::String */
+static extension-type-member method ExtString|constructor#_#new#tearOff(core::String s) → mai::ExtString% /* erasure=core::String, declared=! */
   return mai::ExtString|constructor#(s);
-static extension-type-member method ExtString|constructor#named(core::String s) → mai::ExtString /* = core::String */ {
-  lowered final mai::ExtString /* = core::String */ #this = "${s} world";
+static extension-type-member method ExtString|constructor#named(core::String s) → mai::ExtString% /* erasure=core::String, declared=! */ {
+  lowered final mai::ExtString% /* erasure=core::String, declared=! */ #this = "${s} world";
   return #this;
 }
-static extension-type-member method ExtString|constructor#_#named#tearOff(core::String s) → mai::ExtString /* = core::String */
+static extension-type-member method ExtString|constructor#_#named#tearOff(core::String s) → mai::ExtString% /* erasure=core::String, declared=! */
   return mai::ExtString|constructor#named(s);
-static extension-type-member method ExtNullable|constructor#(core::String? s) → mai::ExtNullable /* = core::String? */ {
-  lowered final mai::ExtNullable /* = core::String? */ #this = s;
+static extension-type-member method ExtNullable|constructor#(core::String? s) → mai::ExtNullable% /* erasure=core::String?, declared=! */ {
+  lowered final mai::ExtNullable% /* erasure=core::String?, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method ExtNullable|constructor#_#new#tearOff(core::String? s) → mai::ExtNullable /* = core::String? */
+static extension-type-member method ExtNullable|constructor#_#new#tearOff(core::String? s) → mai::ExtNullable% /* erasure=core::String?, declared=! */
   return mai::ExtNullable|constructor#(s);
-static extension-type-member method ExtGeneric|constructor#<T extends core::Object? = dynamic>(mai::ExtGeneric|constructor#::T% s) → mai::ExtGeneric<mai::ExtGeneric|constructor#::T%> /* = mai::ExtGeneric|constructor#::T% */ {
-  lowered final mai::ExtGeneric<mai::ExtGeneric|constructor#::T%> /* = mai::ExtGeneric|constructor#::T% */ #this = s;
+static extension-type-member method ExtGeneric|constructor#<T extends core::Object? = dynamic>(mai::ExtGeneric|constructor#::T% s) → mai::ExtGeneric<mai::ExtGeneric|constructor#::T%>% /* erasure=mai::ExtGeneric|constructor#::T%, declared=! */ {
+  lowered final mai::ExtGeneric<mai::ExtGeneric|constructor#::T%>% /* erasure=mai::ExtGeneric|constructor#::T%, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method ExtGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(mai::ExtGeneric|constructor#_#new#tearOff::T% s) → mai::ExtGeneric<mai::ExtGeneric|constructor#_#new#tearOff::T%> /* = mai::ExtGeneric|constructor#_#new#tearOff::T% */
+static extension-type-member method ExtGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(mai::ExtGeneric|constructor#_#new#tearOff::T% s) → mai::ExtGeneric<mai::ExtGeneric|constructor#_#new#tearOff::T%>% /* erasure=mai::ExtGeneric|constructor#_#new#tearOff::T%, declared=! */
   return mai::ExtGeneric|constructor#<mai::ExtGeneric|constructor#_#new#tearOff::T%>(s);
 
 constants  {

pkg/front_end/testcases/dartdevc/extension_types/issue54008/main.dart.weak.transformed.expect

@@ -21,108 +21,108 @@ extension type SameGeneric<T extends core::Object? = dynamic>(T% s) {
   constructor • = self::SameGeneric|constructor#;
   constructor tearoff • = self::SameGeneric|constructor#_#new#tearOff;
 }
-static const field self::SameString /* = core::String */ sameString0 = #C1;
-static const field self::SameString /* = core::String */ sameString1 = #C2;
-static const field self::SameNullable /* = core::String? */ sameNullable0 = #C3;
-static const field self::SameNullable /* = core::String? */ sameNullable1 = #C1;
-static const field self::SameGeneric<core::String> /* = core::String */ sameGeneric0 = #C1;
-static const field self::SameGeneric<core::String?> /* = core::String? */ sameGeneric1 = #C3;
-static const field self::SameGeneric<core::String?> /* = core::String? */ sameGeneric2 = #C1;
-static const field #lib1::ExtString /* = core::String */ valString0 = #C1;
-static const field #lib1::ExtString /* = core::String */ valString1 = #C2;
-static const field #lib1::ExtNullable /* = core::String? */ valNullable0 = #C3;
-static const field #lib1::ExtNullable /* = core::String? */ valNullable1 = #C1;
-static const field #lib1::ExtGeneric<core::String> /* = core::String */ valGeneric0 = #C1;
-static const field #lib1::ExtGeneric<core::String?> /* = core::String? */ valGeneric1 = #C3;
-static const field #lib1::ExtGeneric<core::String?> /* = core::String? */ valGeneric2 = #C1;
-static extension-type-member method SameString|constructor#(core::String s) → self::SameString /* = core::String */ {
-  lowered final self::SameString /* = core::String */ #this = s;
+static const field self::SameString% /* erasure=core::String, declared=! */ sameString0 = #C1;
+static const field self::SameString% /* erasure=core::String, declared=! */ sameString1 = #C2;
+static const field self::SameNullable% /* erasure=core::String?, declared=! */ sameNullable0 = #C3;
+static const field self::SameNullable% /* erasure=core::String?, declared=! */ sameNullable1 = #C1;
+static const field self::SameGeneric<core::String>% /* erasure=core::String, declared=! */ sameGeneric0 = #C1;
+static const field self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ sameGeneric1 = #C3;
+static const field self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ sameGeneric2 = #C1;
+static const field #lib1::ExtString% /* erasure=core::String, declared=! */ valString0 = #C1;
+static const field #lib1::ExtString% /* erasure=core::String, declared=! */ valString1 = #C2;
+static const field #lib1::ExtNullable% /* erasure=core::String?, declared=! */ valNullable0 = #C3;
+static const field #lib1::ExtNullable% /* erasure=core::String?, declared=! */ valNullable1 = #C1;
+static const field #lib1::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ valGeneric0 = #C1;
+static const field #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ valGeneric1 = #C3;
+static const field #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ valGeneric2 = #C1;
+static extension-type-member method SameString|constructor#(core::String s) → self::SameString% /* erasure=core::String, declared=! */ {
+  lowered final self::SameString% /* erasure=core::String, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method SameString|constructor#_#new#tearOff(core::String s) → self::SameString /* = core::String */
+static extension-type-member method SameString|constructor#_#new#tearOff(core::String s) → self::SameString% /* erasure=core::String, declared=! */
   return self::SameString|constructor#(s);
-static extension-type-member method SameString|constructor#named(core::String s) → self::SameString /* = core::String */ {
-  lowered final self::SameString /* = core::String */ #this = "${s} world";
+static extension-type-member method SameString|constructor#named(core::String s) → self::SameString% /* erasure=core::String, declared=! */ {
+  lowered final self::SameString% /* erasure=core::String, declared=! */ #this = "${s} world";
   return #this;
 }
-static extension-type-member method SameString|constructor#_#named#tearOff(core::String s) → self::SameString /* = core::String */
+static extension-type-member method SameString|constructor#_#named#tearOff(core::String s) → self::SameString% /* erasure=core::String, declared=! */
   return self::SameString|constructor#named(s);
-static extension-type-member method SameNullable|constructor#(core::String? s) → self::SameNullable /* = core::String? */ {
-  lowered final self::SameNullable /* = core::String? */ #this = s;
+static extension-type-member method SameNullable|constructor#(core::String? s) → self::SameNullable% /* erasure=core::String?, declared=! */ {
+  lowered final self::SameNullable% /* erasure=core::String?, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method SameNullable|constructor#_#new#tearOff(core::String? s) → self::SameNullable /* = core::String? */
+static extension-type-member method SameNullable|constructor#_#new#tearOff(core::String? s) → self::SameNullable% /* erasure=core::String?, declared=! */
   return self::SameNullable|constructor#(s);
-static extension-type-member method SameGeneric|constructor#<T extends core::Object? = dynamic>(self::SameGeneric|constructor#::T% s) → self::SameGeneric<self::SameGeneric|constructor#::T%> /* = self::SameGeneric|constructor#::T% */ {
-  lowered final self::SameGeneric<self::SameGeneric|constructor#::T%> /* = self::SameGeneric|constructor#::T% */ #this = s;
+static extension-type-member method SameGeneric|constructor#<T extends core::Object? = dynamic>(self::SameGeneric|constructor#::T% s) → self::SameGeneric<self::SameGeneric|constructor#::T%>% /* erasure=self::SameGeneric|constructor#::T%, declared=! */ {
+  lowered final self::SameGeneric<self::SameGeneric|constructor#::T%>% /* erasure=self::SameGeneric|constructor#::T%, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method SameGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::SameGeneric|constructor#_#new#tearOff::T% s) → self::SameGeneric<self::SameGeneric|constructor#_#new#tearOff::T%> /* = self::SameGeneric|constructor#_#new#tearOff::T% */
+static extension-type-member method SameGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::SameGeneric|constructor#_#new#tearOff::T% s) → self::SameGeneric<self::SameGeneric|constructor#_#new#tearOff::T%>% /* erasure=self::SameGeneric|constructor#_#new#tearOff::T%, declared=! */
   return self::SameGeneric|constructor#<self::SameGeneric|constructor#_#new#tearOff::T%>(s);
 static method sameLibrary() → dynamic {
-  self::SameString /* = core::String */ x0 = #C1;
+  self::SameString% /* erasure=core::String, declared=! */ x0 = #C1;
   self::sameString("hello", x0);
-  self::SameString /* = core::String */ x1 = #C2;
+  self::SameString% /* erasure=core::String, declared=! */ x1 = #C2;
   self::sameString("hello world", x1);
-  has-declared-initializer self::SameNullable /* = core::String? */ y0 = #C3;
+  has-declared-initializer self::SameNullable% /* erasure=core::String?, declared=! */ y0 = #C3;
   self::sameNullable(null, y0);
-  self::SameNullable /* = core::String? */ y1 = #C1;
+  self::SameNullable% /* erasure=core::String?, declared=! */ y1 = #C1;
   self::sameNullable("hello", y1);
-  self::SameGeneric<core::String> /* = core::String */ z0 = #C1;
+  self::SameGeneric<core::String>% /* erasure=core::String, declared=! */ z0 = #C1;
   self::sameGeneric<core::String>("hello", z0);
-  has-declared-initializer self::SameGeneric<core::String?> /* = core::String? */ z1 = #C3;
+  has-declared-initializer self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ z1 = #C3;
   self::sameGeneric<core::String?>(null, z1);
-  self::SameGeneric<core::String?> /* = core::String? */ z2 = #C1;
+  self::SameGeneric<core::String?>% /* erasure=core::String?, declared=! */ z2 = #C1;
   self::sameGeneric<core::String?>("hello", z2);
 }
-static method sameString(dynamic expected, self::SameString /* = core::String */ es) → void {
+static method sameString(dynamic expected, self::SameString% /* erasure=core::String, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method sameNullable(dynamic expected, self::SameNullable /* = core::String? */ es) → void {
+static method sameNullable(dynamic expected, self::SameNullable% /* erasure=core::String?, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method sameGeneric<T extends core::Object? = dynamic>(dynamic expected, self::SameGeneric<self::sameGeneric::T%> /* = self::sameGeneric::T% */ es) → void {
+static method sameGeneric<T extends core::Object? = dynamic>(dynamic expected, self::SameGeneric<self::sameGeneric::T%>% /* erasure=self::sameGeneric::T%, declared=! */ es) → void {
   self::expect(expected, es);
 }
 static method otherLibrary() → dynamic {
-  #lib1::ExtString /* = core::String */ x0 = #C1;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x0 = #C1;
   self::extString("hello", x0);
-  #lib1::ExtString /* = core::String */ x1 = #C2;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x1 = #C2;
   self::extString("hello world", x1);
-  has-declared-initializer #lib1::ExtNullable /* = core::String? */ y0 = #C3;
+  has-declared-initializer #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y0 = #C3;
   self::extNullable(null, y0);
-  #lib1::ExtNullable /* = core::String? */ y1 = #C1;
+  #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y1 = #C1;
   self::extNullable("hello", y1);
-  #lib1::ExtGeneric<core::String> /* = core::String */ z0 = #C1;
+  #lib1::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ z0 = #C1;
   self::extGeneric<core::String>("hello", z0);
-  has-declared-initializer #lib1::ExtGeneric<core::String?> /* = core::String? */ z1 = #C3;
+  has-declared-initializer #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z1 = #C3;
   self::extGeneric<core::String?>(null, z1);
-  #lib1::ExtGeneric<core::String?> /* = core::String? */ z2 = #C1;
+  #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z2 = #C1;
   self::extGeneric<core::String?>("hello", z2);
 }
 static method imported() → dynamic {
-  #lib1::ExtString /* = core::String */ x0 = #C1;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x0 = #C1;
   self::extString("hello", x0);
-  #lib1::ExtString /* = core::String */ x1 = #C2;
+  #lib1::ExtString% /* erasure=core::String, declared=! */ x1 = #C2;
   self::extString("hello world", x1);
-  has-declared-initializer #lib1::ExtNullable /* = core::String? */ y0 = #C3;
+  has-declared-initializer #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y0 = #C3;
   self::extNullable(null, y0);
-  #lib1::ExtNullable /* = core::String? */ y1 = #C1;
+  #lib1::ExtNullable% /* erasure=core::String?, declared=! */ y1 = #C1;
   self::extNullable("hello", y1);
-  #lib1::ExtGeneric<core::String> /* = core::String */ z0 = #C1;
+  #lib1::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ z0 = #C1;
   self::extGeneric<core::String>("hello", z0);
-  has-declared-initializer #lib1::ExtGeneric<core::String?> /* = core::String? */ z1 = #C3;
+  has-declared-initializer #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z1 = #C3;
   self::extGeneric<core::String?>(null, z1);
-  #lib1::ExtGeneric<core::String?> /* = core::String? */ z2 = #C1;
+  #lib1::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ z2 = #C1;
   self::extGeneric<core::String?>("hello", z2);
 }
-static method extString(dynamic expected, #lib1::ExtString /* = core::String */ es) → void {
+static method extString(dynamic expected, #lib1::ExtString% /* erasure=core::String, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method extNullable(dynamic expected, #lib1::ExtNullable /* = core::String? */ es) → void {
+static method extNullable(dynamic expected, #lib1::ExtNullable% /* erasure=core::String?, declared=! */ es) → void {
   self::expect(expected, es);
 }
-static method extGeneric<T extends core::Object? = dynamic>(dynamic expected, #lib1::ExtGeneric<self::extGeneric::T%> /* = self::extGeneric::T% */ es) → void {
+static method extGeneric<T extends core::Object? = dynamic>(dynamic expected, #lib1::ExtGeneric<self::extGeneric::T%>% /* erasure=self::extGeneric::T%, declared=! */ es) → void {
   self::expect(expected, es);
 }
 static method main() → dynamic {
@@ -156,36 +156,36 @@ extension type ExtGeneric<T extends core::Object? = dynamic>(T% s) {
   constructor • = self2::ExtGeneric|constructor#;
   constructor tearoff • = self2::ExtGeneric|constructor#_#new#tearOff;
 }
-static const field self2::ExtString /* = core::String */ libString0 = #C1;
-static const field self2::ExtString /* = core::String */ libString1 = #C2;
-static const field self2::ExtNullable /* = core::String? */ libNullable0 = #C3;
-static const field self2::ExtNullable /* = core::String? */ libNullable1 = #C1;
-static const field self2::ExtGeneric<core::String> /* = core::String */ libGeneric0 = #C1;
-static const field self2::ExtGeneric<core::String?> /* = core::String? */ libGeneric1 = #C3;
-static const field self2::ExtGeneric<core::String?> /* = core::String? */ libGeneric2 = #C1;
-static extension-type-member method ExtString|constructor#(core::String s) → self2::ExtString /* = core::String */ {
-  lowered final self2::ExtString /* = core::String */ #this = s;
+static const field self2::ExtString% /* erasure=core::String, declared=! */ libString0 = #C1;
+static const field self2::ExtString% /* erasure=core::String, declared=! */ libString1 = #C2;
+static const field self2::ExtNullable% /* erasure=core::String?, declared=! */ libNullable0 = #C3;
+static const field self2::ExtNullable% /* erasure=core::String?, declared=! */ libNullable1 = #C1;
+static const field self2::ExtGeneric<core::String>% /* erasure=core::String, declared=! */ libGeneric0 = #C1;
+static const field self2::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ libGeneric1 = #C3;
+static const field self2::ExtGeneric<core::String?>% /* erasure=core::String?, declared=! */ libGeneric2 = #C1;
+static extension-type-member method ExtString|constructor#(core::String s) → self2::ExtString% /* erasure=core::String, declared=! */ {
+  lowered final self2::ExtString% /* erasure=core::String, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method ExtString|constructor#_#new#tearOff(core::String s) → self2::ExtString /* = core::String */
+static extension-type-member method ExtString|constructor#_#new#tearOff(core::String s) → self2::ExtString% /* erasure=core::String, declared=! */
   return self2::ExtString|constructor#(s);
-static extension-type-member method ExtString|constructor#named(core::String s) → self2::ExtString /* = core::String */ {
-  lowered final self2::ExtString /* = core::String */ #this = "${s} world";
+static extension-type-member method ExtString|constructor#named(core::String s) → self2::ExtString% /* erasure=core::String, declared=! */ {
+  lowered final self2::ExtString% /* erasure=core::String, declared=! */ #this = "${s} world";
   return #this;
 }
-static extension-type-member method ExtString|constructor#_#named#tearOff(core::String s) → self2::ExtString /* = core::String */
+static extension-type-member method ExtString|constructor#_#named#tearOff(core::String s) → self2::ExtString% /* erasure=core::String, declared=! */
   return self2::ExtString|constructor#named(s);
-static extension-type-member method ExtNullable|constructor#(core::String? s) → self2::ExtNullable /* = core::String? */ {
-  lowered final self2::ExtNullable /* = core::String? */ #this = s;
+static extension-type-member method ExtNullable|constructor#(core::String? s) → self2::ExtNullable% /* erasure=core::String?, declared=! */ {
+  lowered final self2::ExtNullable% /* erasure=core::String?, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method ExtNullable|constructor#_#new#tearOff(core::String? s) → self2::ExtNullable /* = core::String? */
+static extension-type-member method ExtNullable|constructor#_#new#tearOff(core::String? s) → self2::ExtNullable% /* erasure=core::String?, declared=! */
   return self2::ExtNullable|constructor#(s);
-static extension-type-member method ExtGeneric|constructor#<T extends core::Object? = dynamic>(self2::ExtGeneric|constructor#::T% s) → self2::ExtGeneric<self2::ExtGeneric|constructor#::T%> /* = self2::ExtGeneric|constructor#::T% */ {
-  lowered final self2::ExtGeneric<self2::ExtGeneric|constructor#::T%> /* = self2::ExtGeneric|constructor#::T% */ #this = s;
+static extension-type-member method ExtGeneric|constructor#<T extends core::Object? = dynamic>(self2::ExtGeneric|constructor#::T% s) → self2::ExtGeneric<self2::ExtGeneric|constructor#::T%>% /* erasure=self2::ExtGeneric|constructor#::T%, declared=! */ {
+  lowered final self2::ExtGeneric<self2::ExtGeneric|constructor#::T%>% /* erasure=self2::ExtGeneric|constructor#::T%, declared=! */ #this = s;
   return #this;
 }
-static extension-type-member method ExtGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self2::ExtGeneric|constructor#_#new#tearOff::T% s) → self2::ExtGeneric<self2::ExtGeneric|constructor#_#new#tearOff::T%> /* = self2::ExtGeneric|constructor#_#new#tearOff::T% */
+static extension-type-member method ExtGeneric|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self2::ExtGeneric|constructor#_#new#tearOff::T% s) → self2::ExtGeneric<self2::ExtGeneric|constructor#_#new#tearOff::T%>% /* erasure=self2::ExtGeneric|constructor#_#new#tearOff::T%, declared=! */
   return self2::ExtGeneric|constructor#<self2::ExtGeneric|constructor#_#new#tearOff::T%>(s);
 
 constants  {

pkg/front_end/testcases/dartdevc/js_interop_transforms/isa.dart.strong.expect

@@ -5,71 +5,71 @@ import "dart:js_interop" as js_;
 
 import "dart:js_interop";
 
-extension type CustomJSAny(js_::JSAny /* = dart.core::Object */ _) implements js_::JSAny /* = dart.core::Object */ {
-  abstract extension-type-member representation-field get _() → js_::JSAny /* = dart.core::Object */;
+extension type CustomJSAny(js_::JSAny /* erasure=dart.core::Object */ _) implements js_::JSAny /* erasure=dart.core::Object */ {
+  abstract extension-type-member representation-field get _() → js_::JSAny /* erasure=dart.core::Object */;
   constructor • = self::CustomJSAny|constructor#;
   constructor tearoff • = self::CustomJSAny|constructor#_#new#tearOff;
 }
-extension type CustomJSObject(js_::JSObject /* = dart._interceptors::JSObject */ _) implements js_::JSObject /* = dart._interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSObject /* = dart._interceptors::JSObject */;
+extension type CustomJSObject(js_::JSObject /* erasure=dart._interceptors::JSObject */ _) implements js_::JSObject /* erasure=dart._interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSObject /* erasure=dart._interceptors::JSObject */;
   constructor • = self::CustomJSObject|constructor#;
   constructor tearoff • = self::CustomJSObject|constructor#_#new#tearOff;
 }
-extension type CustomTypedArray(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* = dart._interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */;
+extension type CustomTypedArray(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* erasure=dart._interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */;
   constructor • = self::CustomTypedArray|constructor#;
   constructor tearoff • = self::CustomTypedArray|constructor#_#new#tearOff;
 }
 @#C4
-extension type CustomJSArray(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* = dart._interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */;
+extension type CustomJSArray(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* erasure=dart._interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */;
   constructor • = self::CustomJSArray|constructor#;
   constructor tearoff • = self::CustomJSArray|constructor#_#new#tearOff;
 }
-static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */ {
-  lowered final self::CustomJSAny /* = dart.core::Object */ #this = _;
+static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */ {
+  lowered final self::CustomJSAny /* erasure=dart.core::Object */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */
+static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */
   return self::CustomJSAny|constructor#(_);
-static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* = dart._interceptors::JSObject */ _) → self::CustomJSObject /* = dart._interceptors::JSObject */ {
-  lowered final self::CustomJSObject /* = dart._interceptors::JSObject */ #this = _;
+static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* erasure=dart._interceptors::JSObject */ _) → self::CustomJSObject /* erasure=dart._interceptors::JSObject */ {
+  lowered final self::CustomJSObject /* erasure=dart._interceptors::JSObject */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* = dart._interceptors::JSObject */ _) → self::CustomJSObject /* = dart._interceptors::JSObject */
+static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* erasure=dart._interceptors::JSObject */ _) → self::CustomJSObject /* erasure=dart._interceptors::JSObject */
   return self::CustomJSObject|constructor#(_);
-static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ {
-  lowered final self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ #this = _;
+static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ {
+  lowered final self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ #this = _;
   return #this;
 }
-static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */
+static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */
   return self::CustomTypedArray|constructor#(_);
-static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */ {
-  lowered final self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */ #this = _;
+static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ {
+  lowered final self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */
+static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */
   return self::CustomJSArray|constructor#(_);
-static method test(js_::JSAny /* = dart.core::Object */ any) → void {
-  js_::JSAnyUtilityExtension|isA<js_::JSAny /* = dart.core::Object */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSAny? /* = dart.core::Object? */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSString /* = dart.core::String */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSString? /* = dart.core::String? */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSNumber /* = dart.core::double */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSBoolean /* = dart.core::bool */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSSymbol /* = dart._interceptors::JavaScriptSymbol */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSBigInt /* = dart._interceptors::JavaScriptBigInt */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSObject /* = dart._interceptors::JSObject */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSObject? /* = dart._interceptors::JSObject? */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomJSAny /* = dart.core::Object */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomJSObject /* = dart._interceptors::JSObject */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSAny /* = dart.core::Object */>((() → js_::JSAny /* = dart.core::Object */ {
+static method test(js_::JSAny /* erasure=dart.core::Object */ any) → void {
+  js_::JSAnyUtilityExtension|isA<js_::JSAny /* erasure=dart.core::Object */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSAny? /* erasure=dart.core::Object? */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSString /* erasure=dart.core::String */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSString? /* erasure=dart.core::String? */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSNumber /* erasure=dart.core::double */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSBoolean /* erasure=dart.core::bool */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSSymbol /* erasure=dart._interceptors::JavaScriptSymbol */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSBigInt /* erasure=dart._interceptors::JavaScriptBigInt */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSObject /* erasure=dart._interceptors::JSObject */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSObject? /* erasure=dart._interceptors::JSObject? */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomJSAny /* erasure=dart.core::Object */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomJSObject /* erasure=dart._interceptors::JSObject */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSAny /* erasure=dart.core::Object */>((() → js_::JSAny /* erasure=dart.core::Object */ {
     return any;
-  })(){() → js_::JSAny /* = dart.core::Object */});
+  })(){() → js_::JSAny /* erasure=dart.core::Object */});
 }
 static method main() → void {}
 

pkg/front_end/testcases/dartdevc/js_interop_transforms/isa.dart.strong.transformed.expect

@@ -6,52 +6,52 @@ import "dart:js_interop_unsafe" as js_2;
 
 import "dart:js_interop";
 
-extension type CustomJSAny(js_::JSAny /* = dart.core::Object */ _) implements js_::JSAny /* = dart.core::Object */ {
-  abstract extension-type-member representation-field get _() → js_::JSAny /* = dart.core::Object */;
+extension type CustomJSAny(js_::JSAny /* erasure=dart.core::Object */ _) implements js_::JSAny /* erasure=dart.core::Object */ {
+  abstract extension-type-member representation-field get _() → js_::JSAny /* erasure=dart.core::Object */;
   constructor • = self::CustomJSAny|constructor#;
   constructor tearoff • = self::CustomJSAny|constructor#_#new#tearOff;
 }
-extension type CustomJSObject(js_::JSObject /* = dart._interceptors::JSObject */ _) implements js_::JSObject /* = dart._interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSObject /* = dart._interceptors::JSObject */;
+extension type CustomJSObject(js_::JSObject /* erasure=dart._interceptors::JSObject */ _) implements js_::JSObject /* erasure=dart._interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSObject /* erasure=dart._interceptors::JSObject */;
   constructor • = self::CustomJSObject|constructor#;
   constructor tearoff • = self::CustomJSObject|constructor#_#new#tearOff;
 }
-extension type CustomTypedArray(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* = dart._interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */;
+extension type CustomTypedArray(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* erasure=dart._interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */;
   constructor • = self::CustomTypedArray|constructor#;
   constructor tearoff • = self::CustomTypedArray|constructor#_#new#tearOff;
 }
 @#C4
-extension type CustomJSArray(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* = dart._interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */;
+extension type CustomJSArray(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* erasure=dart._interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */;
   constructor • = self::CustomJSArray|constructor#;
   constructor tearoff • = self::CustomJSArray|constructor#_#new#tearOff;
 }
-static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */ {
-  lowered final self::CustomJSAny /* = dart.core::Object */ #this = _;
+static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */ {
+  lowered final self::CustomJSAny /* erasure=dart.core::Object */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */
+static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */
   return self::CustomJSAny|constructor#(_);
-static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* = dart._interceptors::JSObject */ _) → self::CustomJSObject /* = dart._interceptors::JSObject */ {
-  lowered final self::CustomJSObject /* = dart._interceptors::JSObject */ #this = _;
+static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* erasure=dart._interceptors::JSObject */ _) → self::CustomJSObject /* erasure=dart._interceptors::JSObject */ {
+  lowered final self::CustomJSObject /* erasure=dart._interceptors::JSObject */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* = dart._interceptors::JSObject */ _) → self::CustomJSObject /* = dart._interceptors::JSObject */
+static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* erasure=dart._interceptors::JSObject */ _) → self::CustomJSObject /* erasure=dart._interceptors::JSObject */
   return self::CustomJSObject|constructor#(_);
-static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ {
-  lowered final self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ #this = _;
+static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ {
+  lowered final self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ #this = _;
   return #this;
 }
-static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */
+static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */
   return self::CustomTypedArray|constructor#(_);
-static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */ {
-  lowered final self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */ #this = _;
+static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ {
+  lowered final self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */
+static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */
   return self::CustomJSArray|constructor#(_);
-static method test(js_::JSAny /* = dart.core::Object */ any) → void {
+static method test(js_::JSAny /* erasure=dart.core::Object */ any) → void {
   !(any == null);
   true;
   !(any == null) && js_::JSAnyUtilityExtension|typeofEquals(any, "string");
@@ -63,14 +63,14 @@ static method test(js_::JSAny /* = dart.core::Object */ any) → void {
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "Object");
   any == null || js_::JSAnyUtilityExtension|instanceOfString(any, "Object");
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "Array");
-  !(any == null) && js_::JSAnyUtilityExtension|instanceof(any, js_2::JSObjectUnsafeUtilExtension|callMethodVarArgs<js_::JSFunction /* = dart._interceptors::JavaScriptFunction */>(js_2::JSObjectUnsafeUtilExtension|[](js_::globalContext, "Object") as{ForLegacy} js_::JSObject /* = dart._interceptors::JSObject */, js_::StringToJSString|get#toJS("getPrototypeOf"), <js_::JSAny? /* = dart.core::Object? */>[js_2::JSObjectUnsafeUtilExtension|[](js_::globalContext, "Int8Array") as{ForLegacy} js_::JSObject /* = dart._interceptors::JSObject */]));
+  !(any == null) && js_::JSAnyUtilityExtension|instanceof(any, js_2::JSObjectUnsafeUtilExtension|callMethodVarArgs<js_::JSFunction /* erasure=dart._interceptors::JavaScriptFunction */>(js_2::JSObjectUnsafeUtilExtension|[](js_::globalContext, "Object") as{ForLegacy} js_::JSObject /* erasure=dart._interceptors::JSObject */, js_::StringToJSString|get#toJS("getPrototypeOf"), <js_::JSAny? /* erasure=dart.core::Object? */>[js_2::JSObjectUnsafeUtilExtension|[](js_::globalContext, "Int8Array") as{ForLegacy} js_::JSObject /* erasure=dart._interceptors::JSObject */]));
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "library1.CustomJSAny");
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "library1.CustomJSObject");
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "library1.CustomTypedArray");
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "library1.RenamedJSArray");
-  let final js_::JSAny? /* = dart.core::Object? */ #t1 = (() → js_::JSAny /* = dart.core::Object */ {
+  let final js_::JSAny? /* erasure=dart.core::Object? */ #t1 = (() → js_::JSAny /* erasure=dart.core::Object */ {
     return any;
-  })(){() → js_::JSAny /* = dart.core::Object */} in !(#t1 == null);
+  })(){() → js_::JSAny /* erasure=dart.core::Object */} in !(#t1 == null);
 }
 static method main() → void {}
 

pkg/front_end/testcases/dartdevc/js_interop_transforms/isa.dart.weak.expect

@@ -5,71 +5,71 @@ import "dart:js_interop" as js_;
 
 import "dart:js_interop";
 
-extension type CustomJSAny(js_::JSAny /* = dart.core::Object */ _) implements js_::JSAny /* = dart.core::Object */ {
-  abstract extension-type-member representation-field get _() → js_::JSAny /* = dart.core::Object */;
+extension type CustomJSAny(js_::JSAny /* erasure=dart.core::Object */ _) implements js_::JSAny /* erasure=dart.core::Object */ {
+  abstract extension-type-member representation-field get _() → js_::JSAny /* erasure=dart.core::Object */;
   constructor • = self::CustomJSAny|constructor#;
   constructor tearoff • = self::CustomJSAny|constructor#_#new#tearOff;
 }
-extension type CustomJSObject(js_::JSObject /* = dart._interceptors::JSObject */ _) implements js_::JSObject /* = dart._interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSObject /* = dart._interceptors::JSObject */;
+extension type CustomJSObject(js_::JSObject /* erasure=dart._interceptors::JSObject */ _) implements js_::JSObject /* erasure=dart._interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSObject /* erasure=dart._interceptors::JSObject */;
   constructor • = self::CustomJSObject|constructor#;
   constructor tearoff • = self::CustomJSObject|constructor#_#new#tearOff;
 }
-extension type CustomTypedArray(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* = dart._interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */;
+extension type CustomTypedArray(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* erasure=dart._interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */;
   constructor • = self::CustomTypedArray|constructor#;
   constructor tearoff • = self::CustomTypedArray|constructor#_#new#tearOff;
 }
 @#C4
-extension type CustomJSArray(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* = dart._interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */;
+extension type CustomJSArray(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* erasure=dart._interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */;
   constructor • = self::CustomJSArray|constructor#;
   constructor tearoff • = self::CustomJSArray|constructor#_#new#tearOff;
 }
-static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */ {
-  lowered final self::CustomJSAny /* = dart.core::Object */ #this = _;
+static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */ {
+  lowered final self::CustomJSAny /* erasure=dart.core::Object */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */
+static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */
   return self::CustomJSAny|constructor#(_);
-static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* = dart._interceptors::JSObject */ _) → self::CustomJSObject /* = dart._interceptors::JSObject */ {
-  lowered final self::CustomJSObject /* = dart._interceptors::JSObject */ #this = _;
+static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* erasure=dart._interceptors::JSObject */ _) → self::CustomJSObject /* erasure=dart._interceptors::JSObject */ {
+  lowered final self::CustomJSObject /* erasure=dart._interceptors::JSObject */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* = dart._interceptors::JSObject */ _) → self::CustomJSObject /* = dart._interceptors::JSObject */
+static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* erasure=dart._interceptors::JSObject */ _) → self::CustomJSObject /* erasure=dart._interceptors::JSObject */
   return self::CustomJSObject|constructor#(_);
-static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ {
-  lowered final self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ #this = _;
+static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ {
+  lowered final self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ #this = _;
   return #this;
 }
-static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */
+static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */
   return self::CustomTypedArray|constructor#(_);
-static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */ {
-  lowered final self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */ #this = _;
+static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ {
+  lowered final self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */
+static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */
   return self::CustomJSArray|constructor#(_);
-static method test(js_::JSAny /* = dart.core::Object */ any) → void {
-  js_::JSAnyUtilityExtension|isA<js_::JSAny /* = dart.core::Object */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSAny? /* = dart.core::Object? */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSString /* = dart.core::String */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSString? /* = dart.core::String? */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSNumber /* = dart.core::double */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSBoolean /* = dart.core::bool */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSSymbol /* = dart._interceptors::JavaScriptSymbol */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSBigInt /* = dart._interceptors::JavaScriptBigInt */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSObject /* = dart._interceptors::JSObject */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSObject? /* = dart._interceptors::JSObject? */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomJSAny /* = dart.core::Object */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomJSObject /* = dart._interceptors::JSObject */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSAny /* = dart.core::Object */>((() → js_::JSAny /* = dart.core::Object */ {
+static method test(js_::JSAny /* erasure=dart.core::Object */ any) → void {
+  js_::JSAnyUtilityExtension|isA<js_::JSAny /* erasure=dart.core::Object */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSAny? /* erasure=dart.core::Object? */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSString /* erasure=dart.core::String */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSString? /* erasure=dart.core::String? */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSNumber /* erasure=dart.core::double */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSBoolean /* erasure=dart.core::bool */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSSymbol /* erasure=dart._interceptors::JavaScriptSymbol */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSBigInt /* erasure=dart._interceptors::JavaScriptBigInt */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSObject /* erasure=dart._interceptors::JSObject */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSObject? /* erasure=dart._interceptors::JSObject? */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomJSAny /* erasure=dart.core::Object */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomJSObject /* erasure=dart._interceptors::JSObject */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSAny /* erasure=dart.core::Object */>((() → js_::JSAny /* erasure=dart.core::Object */ {
     return any;
-  })(){() → js_::JSAny /* = dart.core::Object */});
+  })(){() → js_::JSAny /* erasure=dart.core::Object */});
 }
 static method main() → void {}
 

pkg/front_end/testcases/dartdevc/js_interop_transforms/isa.dart.weak.modular.expect

@@ -5,71 +5,71 @@ import "dart:js_interop" as js_;
 
 import "dart:js_interop";
 
-extension type CustomJSAny(js_::JSAny /* = dart.core::Object */ _) implements js_::JSAny /* = dart.core::Object */ {
-  abstract extension-type-member representation-field get _() → js_::JSAny /* = dart.core::Object */;
+extension type CustomJSAny(js_::JSAny /* erasure=dart.core::Object */ _) implements js_::JSAny /* erasure=dart.core::Object */ {
+  abstract extension-type-member representation-field get _() → js_::JSAny /* erasure=dart.core::Object */;
   constructor • = self::CustomJSAny|constructor#;
   constructor tearoff • = self::CustomJSAny|constructor#_#new#tearOff;
 }
-extension type CustomJSObject(js_::JSObject /* = dart._interceptors::JSObject */ _) implements js_::JSObject /* = dart._interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSObject /* = dart._interceptors::JSObject */;
+extension type CustomJSObject(js_::JSObject /* erasure=dart._interceptors::JSObject */ _) implements js_::JSObject /* erasure=dart._interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSObject /* erasure=dart._interceptors::JSObject */;
   constructor • = self::CustomJSObject|constructor#;
   constructor tearoff • = self::CustomJSObject|constructor#_#new#tearOff;
 }
-extension type CustomTypedArray(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* = dart._interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */;
+extension type CustomTypedArray(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* erasure=dart._interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */;
   constructor • = self::CustomTypedArray|constructor#;
   constructor tearoff • = self::CustomTypedArray|constructor#_#new#tearOff;
 }
 @#C4
-extension type CustomJSArray(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* = dart._interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */;
+extension type CustomJSArray(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* erasure=dart._interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */;
   constructor • = self::CustomJSArray|constructor#;
   constructor tearoff • = self::CustomJSArray|constructor#_#new#tearOff;
 }
-static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */ {
-  lowered final self::CustomJSAny /* = dart.core::Object */ #this = _;
+static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */ {
+  lowered final self::CustomJSAny /* erasure=dart.core::Object */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */
+static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */
   return self::CustomJSAny|constructor#(_);
-static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* = dart._interceptors::JSObject */ _) → self::CustomJSObject /* = dart._interceptors::JSObject */ {
-  lowered final self::CustomJSObject /* = dart._interceptors::JSObject */ #this = _;
+static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* erasure=dart._interceptors::JSObject */ _) → self::CustomJSObject /* erasure=dart._interceptors::JSObject */ {
+  lowered final self::CustomJSObject /* erasure=dart._interceptors::JSObject */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* = dart._interceptors::JSObject */ _) → self::CustomJSObject /* = dart._interceptors::JSObject */
+static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* erasure=dart._interceptors::JSObject */ _) → self::CustomJSObject /* erasure=dart._interceptors::JSObject */
   return self::CustomJSObject|constructor#(_);
-static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ {
-  lowered final self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ #this = _;
+static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ {
+  lowered final self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ #this = _;
   return #this;
 }
-static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */
+static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */
   return self::CustomTypedArray|constructor#(_);
-static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */ {
-  lowered final self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */ #this = _;
+static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ {
+  lowered final self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */
+static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */
   return self::CustomJSArray|constructor#(_);
-static method test(js_::JSAny /* = dart.core::Object */ any) → void {
-  js_::JSAnyUtilityExtension|isA<js_::JSAny /* = dart.core::Object */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSAny? /* = dart.core::Object? */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSString /* = dart.core::String */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSString? /* = dart.core::String? */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSNumber /* = dart.core::double */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSBoolean /* = dart.core::bool */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSSymbol /* = dart._interceptors::JavaScriptSymbol */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSBigInt /* = dart._interceptors::JavaScriptBigInt */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSObject /* = dart._interceptors::JSObject */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSObject? /* = dart._interceptors::JSObject? */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomJSAny /* = dart.core::Object */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomJSObject /* = dart._interceptors::JSObject */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */>(any);
-  js_::JSAnyUtilityExtension|isA<self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */>(any);
-  js_::JSAnyUtilityExtension|isA<js_::JSAny /* = dart.core::Object */>((() → js_::JSAny /* = dart.core::Object */ {
+static method test(js_::JSAny /* erasure=dart.core::Object */ any) → void {
+  js_::JSAnyUtilityExtension|isA<js_::JSAny /* erasure=dart.core::Object */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSAny? /* erasure=dart.core::Object? */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSString /* erasure=dart.core::String */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSString? /* erasure=dart.core::String? */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSNumber /* erasure=dart.core::double */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSBoolean /* erasure=dart.core::bool */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSSymbol /* erasure=dart._interceptors::JavaScriptSymbol */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSBigInt /* erasure=dart._interceptors::JavaScriptBigInt */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSObject /* erasure=dart._interceptors::JSObject */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSObject? /* erasure=dart._interceptors::JSObject? */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomJSAny /* erasure=dart.core::Object */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomJSObject /* erasure=dart._interceptors::JSObject */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */>(any);
+  js_::JSAnyUtilityExtension|isA<self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */>(any);
+  js_::JSAnyUtilityExtension|isA<js_::JSAny /* erasure=dart.core::Object */>((() → js_::JSAny /* erasure=dart.core::Object */ {
     return any;
-  })(){() → js_::JSAny /* = dart.core::Object */});
+  })(){() → js_::JSAny /* erasure=dart.core::Object */});
 }
 static method main() → void {}
 

pkg/front_end/testcases/dartdevc/js_interop_transforms/isa.dart.weak.outline.expect

@@ -5,44 +5,44 @@ import "dart:js_interop" as js_;
 
 import "dart:js_interop";
 
-extension type CustomJSAny(js_::JSAny /* = dart.core::Object */ _) implements js_::JSAny /* = dart.core::Object */ {
-  abstract extension-type-member representation-field get _() → js_::JSAny /* = dart.core::Object */;
+extension type CustomJSAny(js_::JSAny /* erasure=dart.core::Object */ _) implements js_::JSAny /* erasure=dart.core::Object */ {
+  abstract extension-type-member representation-field get _() → js_::JSAny /* erasure=dart.core::Object */;
   constructor • = self::CustomJSAny|constructor#;
   constructor tearoff • = self::CustomJSAny|constructor#_#new#tearOff;
 }
-extension type CustomJSObject(js_::JSObject /* = dart._interceptors::JSObject */ _) implements js_::JSObject /* = dart._interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSObject /* = dart._interceptors::JSObject */;
+extension type CustomJSObject(js_::JSObject /* erasure=dart._interceptors::JSObject */ _) implements js_::JSObject /* erasure=dart._interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSObject /* erasure=dart._interceptors::JSObject */;
   constructor • = self::CustomJSObject|constructor#;
   constructor tearoff • = self::CustomJSObject|constructor#_#new#tearOff;
 }
-extension type CustomTypedArray(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* = dart._interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */;
+extension type CustomTypedArray(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* erasure=dart._interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */;
   constructor • = self::CustomTypedArray|constructor#;
   constructor tearoff • = self::CustomTypedArray|constructor#_#new#tearOff;
 }
 @js_::JS::•("RenamedJSArray")
-extension type CustomJSArray(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* = dart._interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */;
+extension type CustomJSArray(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* erasure=dart._interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */;
   constructor • = self::CustomJSArray|constructor#;
   constructor tearoff • = self::CustomJSArray|constructor#_#new#tearOff;
 }
-static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */
+static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */
   ;
-static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */
+static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */
   return self::CustomJSAny|constructor#(_);
-static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* = dart._interceptors::JSObject */ _) → self::CustomJSObject /* = dart._interceptors::JSObject */
+static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* erasure=dart._interceptors::JSObject */ _) → self::CustomJSObject /* erasure=dart._interceptors::JSObject */
   ;
-static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* = dart._interceptors::JSObject */ _) → self::CustomJSObject /* = dart._interceptors::JSObject */
+static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* erasure=dart._interceptors::JSObject */ _) → self::CustomJSObject /* erasure=dart._interceptors::JSObject */
   return self::CustomJSObject|constructor#(_);
-static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */
+static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */
   ;
-static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */
+static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */
   return self::CustomTypedArray|constructor#(_);
-static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */
+static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */
   ;
-static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */
+static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */
   return self::CustomJSArray|constructor#(_);
-static method test(js_::JSAny /* = dart.core::Object */ any) → void
+static method test(js_::JSAny /* erasure=dart.core::Object */ any) → void
   ;
 static method main() → void
   ;

pkg/front_end/testcases/dartdevc/js_interop_transforms/isa.dart.weak.transformed.expect

@@ -6,52 +6,52 @@ import "dart:js_interop_unsafe" as js_2;
 
 import "dart:js_interop";
 
-extension type CustomJSAny(js_::JSAny /* = dart.core::Object */ _) implements js_::JSAny /* = dart.core::Object */ {
-  abstract extension-type-member representation-field get _() → js_::JSAny /* = dart.core::Object */;
+extension type CustomJSAny(js_::JSAny /* erasure=dart.core::Object */ _) implements js_::JSAny /* erasure=dart.core::Object */ {
+  abstract extension-type-member representation-field get _() → js_::JSAny /* erasure=dart.core::Object */;
   constructor • = self::CustomJSAny|constructor#;
   constructor tearoff • = self::CustomJSAny|constructor#_#new#tearOff;
 }
-extension type CustomJSObject(js_::JSObject /* = dart._interceptors::JSObject */ _) implements js_::JSObject /* = dart._interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSObject /* = dart._interceptors::JSObject */;
+extension type CustomJSObject(js_::JSObject /* erasure=dart._interceptors::JSObject */ _) implements js_::JSObject /* erasure=dart._interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSObject /* erasure=dart._interceptors::JSObject */;
   constructor • = self::CustomJSObject|constructor#;
   constructor tearoff • = self::CustomJSObject|constructor#_#new#tearOff;
 }
-extension type CustomTypedArray(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* = dart._interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */;
+extension type CustomTypedArray(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) implements js_::JSObject /* erasure=dart._interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */;
   constructor • = self::CustomTypedArray|constructor#;
   constructor tearoff • = self::CustomTypedArray|constructor#_#new#tearOff;
 }
 @#C4
-extension type CustomJSArray(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* = dart._interceptors::JSObject */ {
-  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */;
+extension type CustomJSArray(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ _) implements js_::JSObject /* erasure=dart._interceptors::JSObject */ {
+  abstract extension-type-member representation-field get _() → js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */;
   constructor • = self::CustomJSArray|constructor#;
   constructor tearoff • = self::CustomJSArray|constructor#_#new#tearOff;
 }
-static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */ {
-  lowered final self::CustomJSAny /* = dart.core::Object */ #this = _;
+static extension-type-member method CustomJSAny|constructor#(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */ {
+  lowered final self::CustomJSAny /* erasure=dart.core::Object */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* = dart.core::Object */ _) → self::CustomJSAny /* = dart.core::Object */
+static extension-type-member method CustomJSAny|constructor#_#new#tearOff(js_::JSAny /* erasure=dart.core::Object */ _) → self::CustomJSAny /* erasure=dart.core::Object */
   return self::CustomJSAny|constructor#(_);
-static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* = dart._interceptors::JSObject */ _) → self::CustomJSObject /* = dart._interceptors::JSObject */ {
-  lowered final self::CustomJSObject /* = dart._interceptors::JSObject */ #this = _;
+static extension-type-member method CustomJSObject|constructor#(js_::JSObject /* erasure=dart._interceptors::JSObject */ _) → self::CustomJSObject /* erasure=dart._interceptors::JSObject */ {
+  lowered final self::CustomJSObject /* erasure=dart._interceptors::JSObject */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* = dart._interceptors::JSObject */ _) → self::CustomJSObject /* = dart._interceptors::JSObject */
+static extension-type-member method CustomJSObject|constructor#_#new#tearOff(js_::JSObject /* erasure=dart._interceptors::JSObject */ _) → self::CustomJSObject /* erasure=dart._interceptors::JSObject */
   return self::CustomJSObject|constructor#(_);
-static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ {
-  lowered final self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */ #this = _;
+static extension-type-member method CustomTypedArray|constructor#(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ {
+  lowered final self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ #this = _;
   return #this;
 }
-static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* = dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* = dart.typed_data.implementation::NativeTypedData */
+static extension-type-member method CustomTypedArray|constructor#_#new#tearOff(js_::JSTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */ _) → self::CustomTypedArray /* erasure=dart.typed_data.implementation::NativeTypedData */
   return self::CustomTypedArray|constructor#(_);
-static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */ {
-  lowered final self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */ #this = _;
+static extension-type-member method CustomJSArray|constructor#(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ {
+  lowered final self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ #this = _;
   return #this;
 }
-static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* = dart.core::Object? */> /* = dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* = dart._interceptors::JSArray<dart.core::Object?> */
+static extension-type-member method CustomJSArray|constructor#_#new#tearOff(js_::JSArray<js_::JSAny? /* erasure=dart.core::Object? */> /* erasure=dart._interceptors::JSArray<dart.core::Object?> */ _) → self::CustomJSArray /* erasure=dart._interceptors::JSArray<dart.core::Object?> */
   return self::CustomJSArray|constructor#(_);
-static method test(js_::JSAny /* = dart.core::Object */ any) → void {
+static method test(js_::JSAny /* erasure=dart.core::Object */ any) → void {
   !(any == null);
   true;
   !(any == null) && js_::JSAnyUtilityExtension|typeofEquals(any, "string");
@@ -63,14 +63,14 @@ static method test(js_::JSAny /* = dart.core::Object */ any) → void {
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "Object");
   any == null || js_::JSAnyUtilityExtension|instanceOfString(any, "Object");
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "Array");
-  !(any == null) && js_::JSAnyUtilityExtension|instanceof(any, js_2::JSObjectUnsafeUtilExtension|callMethodVarArgs<js_::JSFunction /* = dart._interceptors::JavaScriptFunction */>(js_2::JSObjectUnsafeUtilExtension|[](js_::globalContext, "Object") as{ForLegacy} js_::JSObject /* = dart._interceptors::JSObject */, js_::StringToJSString|get#toJS("getPrototypeOf"), <js_::JSAny? /* = dart.core::Object? */>[js_2::JSObjectUnsafeUtilExtension|[](js_::globalContext, "Int8Array") as{ForLegacy} js_::JSObject /* = dart._interceptors::JSObject */]));
+  !(any == null) && js_::JSAnyUtilityExtension|instanceof(any, js_2::JSObjectUnsafeUtilExtension|callMethodVarArgs<js_::JSFunction /* erasure=dart._interceptors::JavaScriptFunction */>(js_2::JSObjectUnsafeUtilExtension|[](js_::globalContext, "Object") as{ForLegacy} js_::JSObject /* erasure=dart._interceptors::JSObject */, js_::StringToJSString|get#toJS("getPrototypeOf"), <js_::JSAny? /* erasure=dart.core::Object? */>[js_2::JSObjectUnsafeUtilExtension|[](js_::globalContext, "Int8Array") as{ForLegacy} js_::JSObject /* erasure=dart._interceptors::JSObject */]));
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "library1.CustomJSAny");
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "library1.CustomJSObject");
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "library1.CustomTypedArray");
   !(any == null) && js_::JSAnyUtilityExtension|instanceOfString(any, "library1.RenamedJSArray");
-  let final js_::JSAny? /* = dart.core::Object? */ #t1 = (() → js_::JSAny /* = dart.core::Object */ {
+  let final js_::JSAny? /* erasure=dart.core::Object? */ #t1 = (() → js_::JSAny /* erasure=dart.core::Object */ {
     return any;
-  })(){() → js_::JSAny /* = dart.core::Object */} in !(#t1 == null);
+  })(){() → js_::JSAny /* erasure=dart.core::Object */} in !(#t1 == null);
 }
 static method main() → void {}
 

pkg/front_end/testcases/expression/extension_type_01.expression.yaml.expect

@@ -1,4 +1,4 @@
 Errors: {
 }
-static method /* from org-dartlang-debug:synthetic_debug_expression */ debugExpr(#lib1::Foo /* = dart.core::int */ f) → dynamic
+static method /* from org-dartlang-debug:synthetic_debug_expression */ debugExpr(#lib1::Foo% /* erasure=dart.core::int, declared=! */ f) → dynamic
   return f as{Unchecked} dart.core::int;

pkg/front_end/testcases/expression/extension_type_02.expression.yaml.expect

@@ -1,4 +1,4 @@
 Errors: {
 }
-static method /* from org-dartlang-debug:synthetic_debug_expression */ debugExpr(#lib1::Bar /* = dart.core::String */ x) → dynamic
+static method /* from org-dartlang-debug:synthetic_debug_expression */ debugExpr(#lib1::Bar% /* erasure=dart.core::String, declared=! */ x) → dynamic
   return #lib1::Bar|printBar(x);

pkg/front_end/testcases/expression/extension_type_02_prime.expression.yaml.expect

@@ -1,4 +1,4 @@
 Errors: {
 }
-static method /* from org-dartlang-debug:synthetic_debug_expression */ debugExpr(#lib1::Foo /* = dart.core::int */ x) → dynamic
+static method /* from org-dartlang-debug:synthetic_debug_expression */ debugExpr(#lib1::Foo% /* erasure=dart.core::int, declared=! */ x) → dynamic
   return #lib1::Foo|printFoo(x);

pkg/front_end/testcases/expression/extension_type_03.expression.yaml.expect

@@ -1,4 +1,4 @@
 Errors: {
 }
-static method /* from org-dartlang-debug:synthetic_debug_expression */ debugExpr(#lib1::Foo /* = dart.core::int */ f, dart.core::List<#lib1::Foo /* = dart.core::int */> foos) → dynamic
-  return foos.{dart.core::Iterable::first}{#lib1::Foo /* = dart.core::int */} as{Unchecked} dart.core::int;
+static method /* from org-dartlang-debug:synthetic_debug_expression */ debugExpr(#lib1::Foo% /* erasure=dart.core::int, declared=! */ f, dart.core::List<#lib1::Foo% /* erasure=dart.core::int, declared=! */> foos) → dynamic
+  return foos.{dart.core::Iterable::first}{#lib1::Foo% /* erasure=dart.core::int, declared=! */} as{Unchecked} dart.core::int;

pkg/front_end/testcases/expression/extension_type_04.expression.yaml.expect

@@ -1,4 +1,4 @@
 Errors: {
 }
-method /* from org-dartlang-debug:synthetic_debug_expression */ debugExpr(lowered #lib1::Foo /* = dart.core::int */ #this) → dynamic
+method /* from org-dartlang-debug:synthetic_debug_expression */ debugExpr(lowered #lib1::Foo% /* erasure=dart.core::int, declared=! */ #this) → dynamic
   return #this as{Unchecked} dart.core::int;

pkg/front_end/testcases/extension_types/abstract_members.dart.strong.expect

@@ -129,57 +129,57 @@ extension type ET6(self::A id) implements self::A {
   constructor • = self::ET6|constructor#;
   constructor tearoff • = self::ET6|constructor#_#new#tearOff;
 }
-static extension-type-member method ET1|constructor#(core::int id) → self::ET1 /* = core::int */ {
-  lowered final self::ET1 /* = core::int */ #this = id;
+static extension-type-member method ET1|constructor#(core::int id) → self::ET1% /* erasure=core::int, declared=! */ {
+  lowered final self::ET1% /* erasure=core::int, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET1|constructor#_#new#tearOff(core::int id) → self::ET1 /* = core::int */
+static extension-type-member method ET1|constructor#_#new#tearOff(core::int id) → self::ET1% /* erasure=core::int, declared=! */
   return self::ET1|constructor#(id);
 static abstract extension-type-member get ET1|m() → core::int;
 static abstract extension-type-member set ET1|m(synthesized core::int #externalFieldValue) → void;
-static extension-type-member method ET2|constructor#<T extends core::Object? = dynamic>(self::ET2|constructor#::T% id) → self::ET2<self::ET2|constructor#::T%> /* = self::ET2|constructor#::T% */ {
-  lowered final self::ET2<self::ET2|constructor#::T%> /* = self::ET2|constructor#::T% */ #this = id;
+static extension-type-member method ET2|constructor#<T extends core::Object? = dynamic>(self::ET2|constructor#::T% id) → self::ET2<self::ET2|constructor#::T%>% /* erasure=self::ET2|constructor#::T%, declared=! */ {
+  lowered final self::ET2<self::ET2|constructor#::T%>% /* erasure=self::ET2|constructor#::T%, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET2|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET2|constructor#_#new#tearOff::T% id) → self::ET2<self::ET2|constructor#_#new#tearOff::T%> /* = self::ET2|constructor#_#new#tearOff::T% */
+static extension-type-member method ET2|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET2|constructor#_#new#tearOff::T% id) → self::ET2<self::ET2|constructor#_#new#tearOff::T%>% /* erasure=self::ET2|constructor#_#new#tearOff::T%, declared=! */
   return self::ET2|constructor#<self::ET2|constructor#_#new#tearOff::T%>(id);
-static abstract extension-type-member method ET2|get#getter<T extends core::Object? = dynamic>(lowered final self::ET2<self::ET2|get#getter::T%> /* = self::ET2|get#getter::T% */ #this) → self::ET2|get#getter::T%;
-static extension-type-member method ET3|constructor#(core::int id) → self::ET3 /* = core::int */ {
-  lowered final self::ET3 /* = core::int */ #this = id;
+static abstract extension-type-member method ET2|get#getter<T extends core::Object? = dynamic>(lowered final self::ET2<self::ET2|get#getter::T%>% /* erasure=self::ET2|get#getter::T%, declared=! */ #this) → self::ET2|get#getter::T%;
+static extension-type-member method ET3|constructor#(core::int id) → self::ET3% /* erasure=core::int, declared=! */ {
+  lowered final self::ET3% /* erasure=core::int, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET3|constructor#_#new#tearOff(core::int id) → self::ET3 /* = core::int */
+static extension-type-member method ET3|constructor#_#new#tearOff(core::int id) → self::ET3% /* erasure=core::int, declared=! */
   return self::ET3|constructor#(id);
-static abstract extension-type-member method ET3|setter(lowered final self::ET3 /* = core::int */ #this, core::int x) → void;
-static extension-type-member method ET3|get#setter(lowered final self::ET3 /* = core::int */ #this) → (core::int) → void
+static abstract extension-type-member method ET3|setter(lowered final self::ET3% /* erasure=core::int, declared=! */ #this, core::int x) → void;
+static extension-type-member method ET3|get#setter(lowered final self::ET3% /* erasure=core::int, declared=! */ #this) → (core::int) → void
   return (core::int x) → void => self::ET3|setter(#this, x);
-static extension-type-member method ET4|constructor#<T extends core::Object? = dynamic>(self::ET4|constructor#::T% id) → self::ET4<self::ET4|constructor#::T%> /* = self::ET4|constructor#::T% */ {
-  lowered final self::ET4<self::ET4|constructor#::T%> /* = self::ET4|constructor#::T% */ #this = id;
+static extension-type-member method ET4|constructor#<T extends core::Object? = dynamic>(self::ET4|constructor#::T% id) → self::ET4<self::ET4|constructor#::T%>% /* erasure=self::ET4|constructor#::T%, declared=! */ {
+  lowered final self::ET4<self::ET4|constructor#::T%>% /* erasure=self::ET4|constructor#::T%, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET4|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET4|constructor#_#new#tearOff::T% id) → self::ET4<self::ET4|constructor#_#new#tearOff::T%> /* = self::ET4|constructor#_#new#tearOff::T% */
+static extension-type-member method ET4|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET4|constructor#_#new#tearOff::T% id) → self::ET4<self::ET4|constructor#_#new#tearOff::T%>% /* erasure=self::ET4|constructor#_#new#tearOff::T%, declared=! */
   return self::ET4|constructor#<self::ET4|constructor#_#new#tearOff::T%>(id);
-static abstract extension-type-member method ET4|method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|method::T%> /* = self::ET4|method::T% */ #this) → void;
-static extension-type-member method ET4|get#method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|get#method::T%> /* = self::ET4|get#method::T% */ #this) → () → void
+static abstract extension-type-member method ET4|method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|method::T%>% /* erasure=self::ET4|method::T%, declared=! */ #this) → void;
+static extension-type-member method ET4|get#method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|get#method::T%>% /* erasure=self::ET4|get#method::T%, declared=! */ #this) → () → void
   return () → void => self::ET4|method<self::ET4|get#method::T%>(#this);
-static extension-type-member method ET5|constructor#(core::int id) → self::ET5 /* = core::int */ {
-  lowered final self::ET5 /* = core::int */ #this = id;
+static extension-type-member method ET5|constructor#(core::int id) → self::ET5% /* erasure=core::int, declared=! */ {
+  lowered final self::ET5% /* erasure=core::int, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET5|constructor#_#new#tearOff(core::int id) → self::ET5 /* = core::int */
+static extension-type-member method ET5|constructor#_#new#tearOff(core::int id) → self::ET5% /* erasure=core::int, declared=! */
   return self::ET5|constructor#(id);
-static abstract extension-type-member method ET5|+(lowered final self::ET5 /* = core::int */ #this, core::int other) → core::int;
-static extension-type-member method ET6|constructor#(self::A id) → self::ET6 /* = self::A */ {
-  lowered final self::ET6 /* = self::A */ #this = id;
+static abstract extension-type-member method ET5|+(lowered final self::ET5% /* erasure=core::int, declared=! */ #this, core::int other) → core::int;
+static extension-type-member method ET6|constructor#(self::A id) → self::ET6 /* erasure=self::A */ {
+  lowered final self::ET6 /* erasure=self::A */ #this = id;
   return #this;
 }
-static extension-type-member method ET6|constructor#_#new#tearOff(self::A id) → self::ET6 /* = self::A */
+static extension-type-member method ET6|constructor#_#new#tearOff(self::A id) → self::ET6 /* erasure=self::A */
   return self::ET6|constructor#(id);
-static abstract extension-type-member method ET6|method(lowered final self::ET6 /* = self::A */ #this) → core::int;
-static extension-type-member method ET6|get#method(lowered final self::ET6 /* = self::A */ #this) → () → core::int
+static abstract extension-type-member method ET6|method(lowered final self::ET6 /* erasure=self::A */ #this) → core::int;
+static extension-type-member method ET6|get#method(lowered final self::ET6 /* erasure=self::A */ #this) → () → core::int
   return () → core::int => self::ET6|method(#this);
-static abstract extension-type-member method ET6|get#getter(lowered final self::ET6 /* = self::A */ #this) → core::int;
-static abstract extension-type-member method ET6|set#setter(lowered final self::ET6 /* = self::A */ #this, core::int v) → void;
+static abstract extension-type-member method ET6|get#getter(lowered final self::ET6 /* erasure=self::A */ #this) → core::int;
+static abstract extension-type-member method ET6|set#setter(lowered final self::ET6 /* erasure=self::A */ #this, core::int v) → void;
 static abstract extension-member get E|m() → core::int;
 static abstract extension-member set E|m(synthesized core::int #externalFieldValue) → void;
 static abstract extension-member method E|method(lowered final self::A #this) → core::int;

pkg/front_end/testcases/extension_types/abstract_members.dart.strong.transformed.expect

@@ -129,57 +129,57 @@ extension type ET6(self::A id) implements self::A {
   constructor • = self::ET6|constructor#;
   constructor tearoff • = self::ET6|constructor#_#new#tearOff;
 }
-static extension-type-member method ET1|constructor#(core::int id) → self::ET1 /* = core::int */ {
-  lowered final self::ET1 /* = core::int */ #this = id;
+static extension-type-member method ET1|constructor#(core::int id) → self::ET1% /* erasure=core::int, declared=! */ {
+  lowered final self::ET1% /* erasure=core::int, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET1|constructor#_#new#tearOff(core::int id) → self::ET1 /* = core::int */
+static extension-type-member method ET1|constructor#_#new#tearOff(core::int id) → self::ET1% /* erasure=core::int, declared=! */
   return self::ET1|constructor#(id);
 static abstract extension-type-member get ET1|m() → core::int;
 static abstract extension-type-member set ET1|m(synthesized core::int #externalFieldValue) → void;
-static extension-type-member method ET2|constructor#<T extends core::Object? = dynamic>(self::ET2|constructor#::T% id) → self::ET2<self::ET2|constructor#::T%> /* = self::ET2|constructor#::T% */ {
-  lowered final self::ET2<self::ET2|constructor#::T%> /* = self::ET2|constructor#::T% */ #this = id;
+static extension-type-member method ET2|constructor#<T extends core::Object? = dynamic>(self::ET2|constructor#::T% id) → self::ET2<self::ET2|constructor#::T%>% /* erasure=self::ET2|constructor#::T%, declared=! */ {
+  lowered final self::ET2<self::ET2|constructor#::T%>% /* erasure=self::ET2|constructor#::T%, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET2|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET2|constructor#_#new#tearOff::T% id) → self::ET2<self::ET2|constructor#_#new#tearOff::T%> /* = self::ET2|constructor#_#new#tearOff::T% */
+static extension-type-member method ET2|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET2|constructor#_#new#tearOff::T% id) → self::ET2<self::ET2|constructor#_#new#tearOff::T%>% /* erasure=self::ET2|constructor#_#new#tearOff::T%, declared=! */
   return self::ET2|constructor#<self::ET2|constructor#_#new#tearOff::T%>(id);
-static abstract extension-type-member method ET2|get#getter<T extends core::Object? = dynamic>(lowered final self::ET2<self::ET2|get#getter::T%> /* = self::ET2|get#getter::T% */ #this) → self::ET2|get#getter::T%;
-static extension-type-member method ET3|constructor#(core::int id) → self::ET3 /* = core::int */ {
-  lowered final self::ET3 /* = core::int */ #this = id;
+static abstract extension-type-member method ET2|get#getter<T extends core::Object? = dynamic>(lowered final self::ET2<self::ET2|get#getter::T%>% /* erasure=self::ET2|get#getter::T%, declared=! */ #this) → self::ET2|get#getter::T%;
+static extension-type-member method ET3|constructor#(core::int id) → self::ET3% /* erasure=core::int, declared=! */ {
+  lowered final self::ET3% /* erasure=core::int, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET3|constructor#_#new#tearOff(core::int id) → self::ET3 /* = core::int */
+static extension-type-member method ET3|constructor#_#new#tearOff(core::int id) → self::ET3% /* erasure=core::int, declared=! */
   return self::ET3|constructor#(id);
-static abstract extension-type-member method ET3|setter(lowered final self::ET3 /* = core::int */ #this, core::int x) → void;
-static extension-type-member method ET3|get#setter(lowered final self::ET3 /* = core::int */ #this) → (core::int) → void
+static abstract extension-type-member method ET3|setter(lowered final self::ET3% /* erasure=core::int, declared=! */ #this, core::int x) → void;
+static extension-type-member method ET3|get#setter(lowered final self::ET3% /* erasure=core::int, declared=! */ #this) → (core::int) → void
   return (core::int x) → void => self::ET3|setter(#this, x);
-static extension-type-member method ET4|constructor#<T extends core::Object? = dynamic>(self::ET4|constructor#::T% id) → self::ET4<self::ET4|constructor#::T%> /* = self::ET4|constructor#::T% */ {
-  lowered final self::ET4<self::ET4|constructor#::T%> /* = self::ET4|constructor#::T% */ #this = id;
+static extension-type-member method ET4|constructor#<T extends core::Object? = dynamic>(self::ET4|constructor#::T% id) → self::ET4<self::ET4|constructor#::T%>% /* erasure=self::ET4|constructor#::T%, declared=! */ {
+  lowered final self::ET4<self::ET4|constructor#::T%>% /* erasure=self::ET4|constructor#::T%, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET4|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET4|constructor#_#new#tearOff::T% id) → self::ET4<self::ET4|constructor#_#new#tearOff::T%> /* = self::ET4|constructor#_#new#tearOff::T% */
+static extension-type-member method ET4|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET4|constructor#_#new#tearOff::T% id) → self::ET4<self::ET4|constructor#_#new#tearOff::T%>% /* erasure=self::ET4|constructor#_#new#tearOff::T%, declared=! */
   return self::ET4|constructor#<self::ET4|constructor#_#new#tearOff::T%>(id);
-static abstract extension-type-member method ET4|method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|method::T%> /* = self::ET4|method::T% */ #this) → void;
-static extension-type-member method ET4|get#method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|get#method::T%> /* = self::ET4|get#method::T% */ #this) → () → void
+static abstract extension-type-member method ET4|method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|method::T%>% /* erasure=self::ET4|method::T%, declared=! */ #this) → void;
+static extension-type-member method ET4|get#method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|get#method::T%>% /* erasure=self::ET4|get#method::T%, declared=! */ #this) → () → void
   return () → void => self::ET4|method<self::ET4|get#method::T%>(#this);
-static extension-type-member method ET5|constructor#(core::int id) → self::ET5 /* = core::int */ {
-  lowered final self::ET5 /* = core::int */ #this = id;
+static extension-type-member method ET5|constructor#(core::int id) → self::ET5% /* erasure=core::int, declared=! */ {
+  lowered final self::ET5% /* erasure=core::int, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET5|constructor#_#new#tearOff(core::int id) → self::ET5 /* = core::int */
+static extension-type-member method ET5|constructor#_#new#tearOff(core::int id) → self::ET5% /* erasure=core::int, declared=! */
   return self::ET5|constructor#(id);
-static abstract extension-type-member method ET5|+(lowered final self::ET5 /* = core::int */ #this, core::int other) → core::int;
-static extension-type-member method ET6|constructor#(self::A id) → self::ET6 /* = self::A */ {
-  lowered final self::ET6 /* = self::A */ #this = id;
+static abstract extension-type-member method ET5|+(lowered final self::ET5% /* erasure=core::int, declared=! */ #this, core::int other) → core::int;
+static extension-type-member method ET6|constructor#(self::A id) → self::ET6 /* erasure=self::A */ {
+  lowered final self::ET6 /* erasure=self::A */ #this = id;
   return #this;
 }
-static extension-type-member method ET6|constructor#_#new#tearOff(self::A id) → self::ET6 /* = self::A */
+static extension-type-member method ET6|constructor#_#new#tearOff(self::A id) → self::ET6 /* erasure=self::A */
   return self::ET6|constructor#(id);
-static abstract extension-type-member method ET6|method(lowered final self::ET6 /* = self::A */ #this) → core::int;
-static extension-type-member method ET6|get#method(lowered final self::ET6 /* = self::A */ #this) → () → core::int
+static abstract extension-type-member method ET6|method(lowered final self::ET6 /* erasure=self::A */ #this) → core::int;
+static extension-type-member method ET6|get#method(lowered final self::ET6 /* erasure=self::A */ #this) → () → core::int
   return () → core::int => self::ET6|method(#this);
-static abstract extension-type-member method ET6|get#getter(lowered final self::ET6 /* = self::A */ #this) → core::int;
-static abstract extension-type-member method ET6|set#setter(lowered final self::ET6 /* = self::A */ #this, core::int v) → void;
+static abstract extension-type-member method ET6|get#getter(lowered final self::ET6 /* erasure=self::A */ #this) → core::int;
+static abstract extension-type-member method ET6|set#setter(lowered final self::ET6 /* erasure=self::A */ #this, core::int v) → void;
 static abstract extension-member get E|m() → core::int;
 static abstract extension-member set E|m(synthesized core::int #externalFieldValue) → void;
 static abstract extension-member method E|method(lowered final self::A #this) → core::int;

pkg/front_end/testcases/extension_types/abstract_members.dart.weak.expect

@@ -129,57 +129,57 @@ extension type ET6(self::A id) implements self::A {
   constructor • = self::ET6|constructor#;
   constructor tearoff • = self::ET6|constructor#_#new#tearOff;
 }
-static extension-type-member method ET1|constructor#(core::int id) → self::ET1 /* = core::int */ {
-  lowered final self::ET1 /* = core::int */ #this = id;
+static extension-type-member method ET1|constructor#(core::int id) → self::ET1% /* erasure=core::int, declared=! */ {
+  lowered final self::ET1% /* erasure=core::int, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET1|constructor#_#new#tearOff(core::int id) → self::ET1 /* = core::int */
+static extension-type-member method ET1|constructor#_#new#tearOff(core::int id) → self::ET1% /* erasure=core::int, declared=! */
   return self::ET1|constructor#(id);
 static abstract extension-type-member get ET1|m() → core::int;
 static abstract extension-type-member set ET1|m(synthesized core::int #externalFieldValue) → void;
-static extension-type-member method ET2|constructor#<T extends core::Object? = dynamic>(self::ET2|constructor#::T% id) → self::ET2<self::ET2|constructor#::T%> /* = self::ET2|constructor#::T% */ {
-  lowered final self::ET2<self::ET2|constructor#::T%> /* = self::ET2|constructor#::T% */ #this = id;
+static extension-type-member method ET2|constructor#<T extends core::Object? = dynamic>(self::ET2|constructor#::T% id) → self::ET2<self::ET2|constructor#::T%>% /* erasure=self::ET2|constructor#::T%, declared=! */ {
+  lowered final self::ET2<self::ET2|constructor#::T%>% /* erasure=self::ET2|constructor#::T%, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET2|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET2|constructor#_#new#tearOff::T% id) → self::ET2<self::ET2|constructor#_#new#tearOff::T%> /* = self::ET2|constructor#_#new#tearOff::T% */
+static extension-type-member method ET2|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET2|constructor#_#new#tearOff::T% id) → self::ET2<self::ET2|constructor#_#new#tearOff::T%>% /* erasure=self::ET2|constructor#_#new#tearOff::T%, declared=! */
   return self::ET2|constructor#<self::ET2|constructor#_#new#tearOff::T%>(id);
-static abstract extension-type-member method ET2|get#getter<T extends core::Object? = dynamic>(lowered final self::ET2<self::ET2|get#getter::T%> /* = self::ET2|get#getter::T% */ #this) → self::ET2|get#getter::T%;
-static extension-type-member method ET3|constructor#(core::int id) → self::ET3 /* = core::int */ {
-  lowered final self::ET3 /* = core::int */ #this = id;
+static abstract extension-type-member method ET2|get#getter<T extends core::Object? = dynamic>(lowered final self::ET2<self::ET2|get#getter::T%>% /* erasure=self::ET2|get#getter::T%, declared=! */ #this) → self::ET2|get#getter::T%;
+static extension-type-member method ET3|constructor#(core::int id) → self::ET3% /* erasure=core::int, declared=! */ {
+  lowered final self::ET3% /* erasure=core::int, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET3|constructor#_#new#tearOff(core::int id) → self::ET3 /* = core::int */
+static extension-type-member method ET3|constructor#_#new#tearOff(core::int id) → self::ET3% /* erasure=core::int, declared=! */
   return self::ET3|constructor#(id);
-static abstract extension-type-member method ET3|setter(lowered final self::ET3 /* = core::int */ #this, core::int x) → void;
-static extension-type-member method ET3|get#setter(lowered final self::ET3 /* = core::int */ #this) → (core::int) → void
+static abstract extension-type-member method ET3|setter(lowered final self::ET3% /* erasure=core::int, declared=! */ #this, core::int x) → void;
+static extension-type-member method ET3|get#setter(lowered final self::ET3% /* erasure=core::int, declared=! */ #this) → (core::int) → void
   return (core::int x) → void => self::ET3|setter(#this, x);
-static extension-type-member method ET4|constructor#<T extends core::Object? = dynamic>(self::ET4|constructor#::T% id) → self::ET4<self::ET4|constructor#::T%> /* = self::ET4|constructor#::T% */ {
-  lowered final self::ET4<self::ET4|constructor#::T%> /* = self::ET4|constructor#::T% */ #this = id;
+static extension-type-member method ET4|constructor#<T extends core::Object? = dynamic>(self::ET4|constructor#::T% id) → self::ET4<self::ET4|constructor#::T%>% /* erasure=self::ET4|constructor#::T%, declared=! */ {
+  lowered final self::ET4<self::ET4|constructor#::T%>% /* erasure=self::ET4|constructor#::T%, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET4|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET4|constructor#_#new#tearOff::T% id) → self::ET4<self::ET4|constructor#_#new#tearOff::T%> /* = self::ET4|constructor#_#new#tearOff::T% */
+static extension-type-member method ET4|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET4|constructor#_#new#tearOff::T% id) → self::ET4<self::ET4|constructor#_#new#tearOff::T%>% /* erasure=self::ET4|constructor#_#new#tearOff::T%, declared=! */
   return self::ET4|constructor#<self::ET4|constructor#_#new#tearOff::T%>(id);
-static abstract extension-type-member method ET4|method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|method::T%> /* = self::ET4|method::T% */ #this) → void;
-static extension-type-member method ET4|get#method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|get#method::T%> /* = self::ET4|get#method::T% */ #this) → () → void
+static abstract extension-type-member method ET4|method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|method::T%>% /* erasure=self::ET4|method::T%, declared=! */ #this) → void;
+static extension-type-member method ET4|get#method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|get#method::T%>% /* erasure=self::ET4|get#method::T%, declared=! */ #this) → () → void
   return () → void => self::ET4|method<self::ET4|get#method::T%>(#this);
-static extension-type-member method ET5|constructor#(core::int id) → self::ET5 /* = core::int */ {
-  lowered final self::ET5 /* = core::int */ #this = id;
+static extension-type-member method ET5|constructor#(core::int id) → self::ET5% /* erasure=core::int, declared=! */ {
+  lowered final self::ET5% /* erasure=core::int, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET5|constructor#_#new#tearOff(core::int id) → self::ET5 /* = core::int */
+static extension-type-member method ET5|constructor#_#new#tearOff(core::int id) → self::ET5% /* erasure=core::int, declared=! */
   return self::ET5|constructor#(id);
-static abstract extension-type-member method ET5|+(lowered final self::ET5 /* = core::int */ #this, core::int other) → core::int;
-static extension-type-member method ET6|constructor#(self::A id) → self::ET6 /* = self::A */ {
-  lowered final self::ET6 /* = self::A */ #this = id;
+static abstract extension-type-member method ET5|+(lowered final self::ET5% /* erasure=core::int, declared=! */ #this, core::int other) → core::int;
+static extension-type-member method ET6|constructor#(self::A id) → self::ET6 /* erasure=self::A */ {
+  lowered final self::ET6 /* erasure=self::A */ #this = id;
   return #this;
 }
-static extension-type-member method ET6|constructor#_#new#tearOff(self::A id) → self::ET6 /* = self::A */
+static extension-type-member method ET6|constructor#_#new#tearOff(self::A id) → self::ET6 /* erasure=self::A */
   return self::ET6|constructor#(id);
-static abstract extension-type-member method ET6|method(lowered final self::ET6 /* = self::A */ #this) → core::int;
-static extension-type-member method ET6|get#method(lowered final self::ET6 /* = self::A */ #this) → () → core::int
+static abstract extension-type-member method ET6|method(lowered final self::ET6 /* erasure=self::A */ #this) → core::int;
+static extension-type-member method ET6|get#method(lowered final self::ET6 /* erasure=self::A */ #this) → () → core::int
   return () → core::int => self::ET6|method(#this);
-static abstract extension-type-member method ET6|get#getter(lowered final self::ET6 /* = self::A */ #this) → core::int;
-static abstract extension-type-member method ET6|set#setter(lowered final self::ET6 /* = self::A */ #this, core::int v) → void;
+static abstract extension-type-member method ET6|get#getter(lowered final self::ET6 /* erasure=self::A */ #this) → core::int;
+static abstract extension-type-member method ET6|set#setter(lowered final self::ET6 /* erasure=self::A */ #this, core::int v) → void;
 static abstract extension-member get E|m() → core::int;
 static abstract extension-member set E|m(synthesized core::int #externalFieldValue) → void;
 static abstract extension-member method E|method(lowered final self::A #this) → core::int;

pkg/front_end/testcases/extension_types/abstract_members.dart.weak.modular.expect

@@ -129,57 +129,57 @@ extension type ET6(self::A id) implements self::A {
   constructor • = self::ET6|constructor#;
   constructor tearoff • = self::ET6|constructor#_#new#tearOff;
 }
-static extension-type-member method ET1|constructor#(core::int id) → self::ET1 /* = core::int */ {
-  lowered final self::ET1 /* = core::int */ #this = id;
+static extension-type-member method ET1|constructor#(core::int id) → self::ET1% /* erasure=core::int, declared=! */ {
+  lowered final self::ET1% /* erasure=core::int, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET1|constructor#_#new#tearOff(core::int id) → self::ET1 /* = core::int */
+static extension-type-member method ET1|constructor#_#new#tearOff(core::int id) → self::ET1% /* erasure=core::int, declared=! */
   return self::ET1|constructor#(id);
 static abstract extension-type-member get ET1|m() → core::int;
 static abstract extension-type-member set ET1|m(synthesized core::int #externalFieldValue) → void;
-static extension-type-member method ET2|constructor#<T extends core::Object? = dynamic>(self::ET2|constructor#::T% id) → self::ET2<self::ET2|constructor#::T%> /* = self::ET2|constructor#::T% */ {
-  lowered final self::ET2<self::ET2|constructor#::T%> /* = self::ET2|constructor#::T% */ #this = id;
+static extension-type-member method ET2|constructor#<T extends core::Object? = dynamic>(self::ET2|constructor#::T% id) → self::ET2<self::ET2|constructor#::T%>% /* erasure=self::ET2|constructor#::T%, declared=! */ {
+  lowered final self::ET2<self::ET2|constructor#::T%>% /* erasure=self::ET2|constructor#::T%, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET2|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET2|constructor#_#new#tearOff::T% id) → self::ET2<self::ET2|constructor#_#new#tearOff::T%> /* = self::ET2|constructor#_#new#tearOff::T% */
+static extension-type-member method ET2|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET2|constructor#_#new#tearOff::T% id) → self::ET2<self::ET2|constructor#_#new#tearOff::T%>% /* erasure=self::ET2|constructor#_#new#tearOff::T%, declared=! */
   return self::ET2|constructor#<self::ET2|constructor#_#new#tearOff::T%>(id);
-static abstract extension-type-member method ET2|get#getter<T extends core::Object? = dynamic>(lowered final self::ET2<self::ET2|get#getter::T%> /* = self::ET2|get#getter::T% */ #this) → self::ET2|get#getter::T%;
-static extension-type-member method ET3|constructor#(core::int id) → self::ET3 /* = core::int */ {
-  lowered final self::ET3 /* = core::int */ #this = id;
+static abstract extension-type-member method ET2|get#getter<T extends core::Object? = dynamic>(lowered final self::ET2<self::ET2|get#getter::T%>% /* erasure=self::ET2|get#getter::T%, declared=! */ #this) → self::ET2|get#getter::T%;
+static extension-type-member method ET3|constructor#(core::int id) → self::ET3% /* erasure=core::int, declared=! */ {
+  lowered final self::ET3% /* erasure=core::int, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET3|constructor#_#new#tearOff(core::int id) → self::ET3 /* = core::int */
+static extension-type-member method ET3|constructor#_#new#tearOff(core::int id) → self::ET3% /* erasure=core::int, declared=! */
   return self::ET3|constructor#(id);
-static abstract extension-type-member method ET3|setter(lowered final self::ET3 /* = core::int */ #this, core::int x) → void;
-static extension-type-member method ET3|get#setter(lowered final self::ET3 /* = core::int */ #this) → (core::int) → void
+static abstract extension-type-member method ET3|setter(lowered final self::ET3% /* erasure=core::int, declared=! */ #this, core::int x) → void;
+static extension-type-member method ET3|get#setter(lowered final self::ET3% /* erasure=core::int, declared=! */ #this) → (core::int) → void
   return (core::int x) → void => self::ET3|setter(#this, x);
-static extension-type-member method ET4|constructor#<T extends core::Object? = dynamic>(self::ET4|constructor#::T% id) → self::ET4<self::ET4|constructor#::T%> /* = self::ET4|constructor#::T% */ {
-  lowered final self::ET4<self::ET4|constructor#::T%> /* = self::ET4|constructor#::T% */ #this = id;
+static extension-type-member method ET4|constructor#<T extends core::Object? = dynamic>(self::ET4|constructor#::T% id) → self::ET4<self::ET4|constructor#::T%>% /* erasure=self::ET4|constructor#::T%, declared=! */ {
+  lowered final self::ET4<self::ET4|constructor#::T%>% /* erasure=self::ET4|constructor#::T%, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET4|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET4|constructor#_#new#tearOff::T% id) → self::ET4<self::ET4|constructor#_#new#tearOff::T%> /* = self::ET4|constructor#_#new#tearOff::T% */
+static extension-type-member method ET4|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET4|constructor#_#new#tearOff::T% id) → self::ET4<self::ET4|constructor#_#new#tearOff::T%>% /* erasure=self::ET4|constructor#_#new#tearOff::T%, declared=! */
   return self::ET4|constructor#<self::ET4|constructor#_#new#tearOff::T%>(id);
-static abstract extension-type-member method ET4|method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|method::T%> /* = self::ET4|method::T% */ #this) → void;
-static extension-type-member method ET4|get#method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|get#method::T%> /* = self::ET4|get#method::T% */ #this) → () → void
+static abstract extension-type-member method ET4|method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|method::T%>% /* erasure=self::ET4|method::T%, declared=! */ #this) → void;
+static extension-type-member method ET4|get#method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|get#method::T%>% /* erasure=self::ET4|get#method::T%, declared=! */ #this) → () → void
   return () → void => self::ET4|method<self::ET4|get#method::T%>(#this);
-static extension-type-member method ET5|constructor#(core::int id) → self::ET5 /* = core::int */ {
-  lowered final self::ET5 /* = core::int */ #this = id;
+static extension-type-member method ET5|constructor#(core::int id) → self::ET5% /* erasure=core::int, declared=! */ {
+  lowered final self::ET5% /* erasure=core::int, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET5|constructor#_#new#tearOff(core::int id) → self::ET5 /* = core::int */
+static extension-type-member method ET5|constructor#_#new#tearOff(core::int id) → self::ET5% /* erasure=core::int, declared=! */
   return self::ET5|constructor#(id);
-static abstract extension-type-member method ET5|+(lowered final self::ET5 /* = core::int */ #this, core::int other) → core::int;
-static extension-type-member method ET6|constructor#(self::A id) → self::ET6 /* = self::A */ {
-  lowered final self::ET6 /* = self::A */ #this = id;
+static abstract extension-type-member method ET5|+(lowered final self::ET5% /* erasure=core::int, declared=! */ #this, core::int other) → core::int;
+static extension-type-member method ET6|constructor#(self::A id) → self::ET6 /* erasure=self::A */ {
+  lowered final self::ET6 /* erasure=self::A */ #this = id;
   return #this;
 }
-static extension-type-member method ET6|constructor#_#new#tearOff(self::A id) → self::ET6 /* = self::A */
+static extension-type-member method ET6|constructor#_#new#tearOff(self::A id) → self::ET6 /* erasure=self::A */
   return self::ET6|constructor#(id);
-static abstract extension-type-member method ET6|method(lowered final self::ET6 /* = self::A */ #this) → core::int;
-static extension-type-member method ET6|get#method(lowered final self::ET6 /* = self::A */ #this) → () → core::int
+static abstract extension-type-member method ET6|method(lowered final self::ET6 /* erasure=self::A */ #this) → core::int;
+static extension-type-member method ET6|get#method(lowered final self::ET6 /* erasure=self::A */ #this) → () → core::int
   return () → core::int => self::ET6|method(#this);
-static abstract extension-type-member method ET6|get#getter(lowered final self::ET6 /* = self::A */ #this) → core::int;
-static abstract extension-type-member method ET6|set#setter(lowered final self::ET6 /* = self::A */ #this, core::int v) → void;
+static abstract extension-type-member method ET6|get#getter(lowered final self::ET6 /* erasure=self::A */ #this) → core::int;
+static abstract extension-type-member method ET6|set#setter(lowered final self::ET6 /* erasure=self::A */ #this, core::int v) → void;
 static abstract extension-member get E|m() → core::int;
 static abstract extension-member set E|m(synthesized core::int #externalFieldValue) → void;
 static abstract extension-member method E|method(lowered final self::A #this) → core::int;

pkg/front_end/testcases/extension_types/abstract_members.dart.weak.outline.expect

@@ -128,45 +128,45 @@ extension type ET6(self::A id) implements self::A {
   constructor • = self::ET6|constructor#;
   constructor tearoff • = self::ET6|constructor#_#new#tearOff;
 }
-static extension-type-member method ET1|constructor#(core::int id) → self::ET1 /* = core::int */
+static extension-type-member method ET1|constructor#(core::int id) → self::ET1% /* erasure=core::int, declared=! */
   ;
-static extension-type-member method ET1|constructor#_#new#tearOff(core::int id) → self::ET1 /* = core::int */
+static extension-type-member method ET1|constructor#_#new#tearOff(core::int id) → self::ET1% /* erasure=core::int, declared=! */
   return self::ET1|constructor#(id);
 static abstract extension-type-member get ET1|m() → core::int;
 static abstract extension-type-member set ET1|m(synthesized core::int #externalFieldValue) → void;
-static extension-type-member method ET2|constructor#<T extends core::Object? = dynamic>(self::ET2|constructor#::T% id) → self::ET2<self::ET2|constructor#::T%> /* = self::ET2|constructor#::T% */
+static extension-type-member method ET2|constructor#<T extends core::Object? = dynamic>(self::ET2|constructor#::T% id) → self::ET2<self::ET2|constructor#::T%>% /* erasure=self::ET2|constructor#::T%, declared=! */
   ;
-static extension-type-member method ET2|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET2|constructor#_#new#tearOff::T% id) → self::ET2<self::ET2|constructor#_#new#tearOff::T%> /* = self::ET2|constructor#_#new#tearOff::T% */
+static extension-type-member method ET2|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET2|constructor#_#new#tearOff::T% id) → self::ET2<self::ET2|constructor#_#new#tearOff::T%>% /* erasure=self::ET2|constructor#_#new#tearOff::T%, declared=! */
   return self::ET2|constructor#<self::ET2|constructor#_#new#tearOff::T%>(id);
-static abstract extension-type-member method ET2|get#getter<T extends core::Object? = dynamic>(lowered final self::ET2<self::ET2|get#getter::T%> /* = self::ET2|get#getter::T% */ #this) → self::ET2|get#getter::T%;
-static extension-type-member method ET3|constructor#(core::int id) → self::ET3 /* = core::int */
+static abstract extension-type-member method ET2|get#getter<T extends core::Object? = dynamic>(lowered final self::ET2<self::ET2|get#getter::T%>% /* erasure=self::ET2|get#getter::T%, declared=! */ #this) → self::ET2|get#getter::T%;
+static extension-type-member method ET3|constructor#(core::int id) → self::ET3% /* erasure=core::int, declared=! */
   ;
-static extension-type-member method ET3|constructor#_#new#tearOff(core::int id) → self::ET3 /* = core::int */
+static extension-type-member method ET3|constructor#_#new#tearOff(core::int id) → self::ET3% /* erasure=core::int, declared=! */
   return self::ET3|constructor#(id);
-static abstract extension-type-member method ET3|setter(lowered final self::ET3 /* = core::int */ #this, core::int x) → void;
-static extension-type-member method ET3|get#setter(lowered final self::ET3 /* = core::int */ #this) → (core::int) → void
+static abstract extension-type-member method ET3|setter(lowered final self::ET3% /* erasure=core::int, declared=! */ #this, core::int x) → void;
+static extension-type-member method ET3|get#setter(lowered final self::ET3% /* erasure=core::int, declared=! */ #this) → (core::int) → void
   return (core::int x) → void => self::ET3|setter(#this, x);
-static extension-type-member method ET4|constructor#<T extends core::Object? = dynamic>(self::ET4|constructor#::T% id) → self::ET4<self::ET4|constructor#::T%> /* = self::ET4|constructor#::T% */
+static extension-type-member method ET4|constructor#<T extends core::Object? = dynamic>(self::ET4|constructor#::T% id) → self::ET4<self::ET4|constructor#::T%>% /* erasure=self::ET4|constructor#::T%, declared=! */
   ;
-static extension-type-member method ET4|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET4|constructor#_#new#tearOff::T% id) → self::ET4<self::ET4|constructor#_#new#tearOff::T%> /* = self::ET4|constructor#_#new#tearOff::T% */
+static extension-type-member method ET4|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET4|constructor#_#new#tearOff::T% id) → self::ET4<self::ET4|constructor#_#new#tearOff::T%>% /* erasure=self::ET4|constructor#_#new#tearOff::T%, declared=! */
   return self::ET4|constructor#<self::ET4|constructor#_#new#tearOff::T%>(id);
-static abstract extension-type-member method ET4|method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|method::T%> /* = self::ET4|method::T% */ #this) → void;
-static extension-type-member method ET4|get#method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|get#method::T%> /* = self::ET4|get#method::T% */ #this) → () → void
+static abstract extension-type-member method ET4|method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|method::T%>% /* erasure=self::ET4|method::T%, declared=! */ #this) → void;
+static extension-type-member method ET4|get#method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|get#method::T%>% /* erasure=self::ET4|get#method::T%, declared=! */ #this) → () → void
   return () → void => self::ET4|method<self::ET4|get#method::T%>(#this);
-static extension-type-member method ET5|constructor#(core::int id) → self::ET5 /* = core::int */
+static extension-type-member method ET5|constructor#(core::int id) → self::ET5% /* erasure=core::int, declared=! */
   ;
-static extension-type-member method ET5|constructor#_#new#tearOff(core::int id) → self::ET5 /* = core::int */
+static extension-type-member method ET5|constructor#_#new#tearOff(core::int id) → self::ET5% /* erasure=core::int, declared=! */
   return self::ET5|constructor#(id);
-static abstract extension-type-member method ET5|+(lowered final self::ET5 /* = core::int */ #this, core::int other) → core::int;
-static extension-type-member method ET6|constructor#(self::A id) → self::ET6 /* = self::A */
+static abstract extension-type-member method ET5|+(lowered final self::ET5% /* erasure=core::int, declared=! */ #this, core::int other) → core::int;
+static extension-type-member method ET6|constructor#(self::A id) → self::ET6 /* erasure=self::A */
   ;
-static extension-type-member method ET6|constructor#_#new#tearOff(self::A id) → self::ET6 /* = self::A */
+static extension-type-member method ET6|constructor#_#new#tearOff(self::A id) → self::ET6 /* erasure=self::A */
   return self::ET6|constructor#(id);
-static abstract extension-type-member method ET6|method(lowered final self::ET6 /* = self::A */ #this) → core::int;
-static extension-type-member method ET6|get#method(lowered final self::ET6 /* = self::A */ #this) → () → core::int
+static abstract extension-type-member method ET6|method(lowered final self::ET6 /* erasure=self::A */ #this) → core::int;
+static extension-type-member method ET6|get#method(lowered final self::ET6 /* erasure=self::A */ #this) → () → core::int
   return () → core::int => self::ET6|method(#this);
-static abstract extension-type-member method ET6|get#getter(lowered final self::ET6 /* = self::A */ #this) → core::int;
-static abstract extension-type-member method ET6|set#setter(lowered final self::ET6 /* = self::A */ #this, core::int v) → void;
+static abstract extension-type-member method ET6|get#getter(lowered final self::ET6 /* erasure=self::A */ #this) → core::int;
+static abstract extension-type-member method ET6|set#setter(lowered final self::ET6 /* erasure=self::A */ #this, core::int v) → void;
 static abstract extension-member get E|m() → core::int;
 static abstract extension-member set E|m(synthesized core::int #externalFieldValue) → void;
 static abstract extension-member method E|method(lowered final self::A #this) → core::int;

pkg/front_end/testcases/extension_types/abstract_members.dart.weak.transformed.expect

@@ -129,57 +129,57 @@ extension type ET6(self::A id) implements self::A {
   constructor • = self::ET6|constructor#;
   constructor tearoff • = self::ET6|constructor#_#new#tearOff;
 }
-static extension-type-member method ET1|constructor#(core::int id) → self::ET1 /* = core::int */ {
-  lowered final self::ET1 /* = core::int */ #this = id;
+static extension-type-member method ET1|constructor#(core::int id) → self::ET1% /* erasure=core::int, declared=! */ {
+  lowered final self::ET1% /* erasure=core::int, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET1|constructor#_#new#tearOff(core::int id) → self::ET1 /* = core::int */
+static extension-type-member method ET1|constructor#_#new#tearOff(core::int id) → self::ET1% /* erasure=core::int, declared=! */
   return self::ET1|constructor#(id);
 static abstract extension-type-member get ET1|m() → core::int;
 static abstract extension-type-member set ET1|m(synthesized core::int #externalFieldValue) → void;
-static extension-type-member method ET2|constructor#<T extends core::Object? = dynamic>(self::ET2|constructor#::T% id) → self::ET2<self::ET2|constructor#::T%> /* = self::ET2|constructor#::T% */ {
-  lowered final self::ET2<self::ET2|constructor#::T%> /* = self::ET2|constructor#::T% */ #this = id;
+static extension-type-member method ET2|constructor#<T extends core::Object? = dynamic>(self::ET2|constructor#::T% id) → self::ET2<self::ET2|constructor#::T%>% /* erasure=self::ET2|constructor#::T%, declared=! */ {
+  lowered final self::ET2<self::ET2|constructor#::T%>% /* erasure=self::ET2|constructor#::T%, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET2|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET2|constructor#_#new#tearOff::T% id) → self::ET2<self::ET2|constructor#_#new#tearOff::T%> /* = self::ET2|constructor#_#new#tearOff::T% */
+static extension-type-member method ET2|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET2|constructor#_#new#tearOff::T% id) → self::ET2<self::ET2|constructor#_#new#tearOff::T%>% /* erasure=self::ET2|constructor#_#new#tearOff::T%, declared=! */
   return self::ET2|constructor#<self::ET2|constructor#_#new#tearOff::T%>(id);
-static abstract extension-type-member method ET2|get#getter<T extends core::Object? = dynamic>(lowered final self::ET2<self::ET2|get#getter::T%> /* = self::ET2|get#getter::T% */ #this) → self::ET2|get#getter::T%;
-static extension-type-member method ET3|constructor#(core::int id) → self::ET3 /* = core::int */ {
-  lowered final self::ET3 /* = core::int */ #this = id;
+static abstract extension-type-member method ET2|get#getter<T extends core::Object? = dynamic>(lowered final self::ET2<self::ET2|get#getter::T%>% /* erasure=self::ET2|get#getter::T%, declared=! */ #this) → self::ET2|get#getter::T%;
+static extension-type-member method ET3|constructor#(core::int id) → self::ET3% /* erasure=core::int, declared=! */ {
+  lowered final self::ET3% /* erasure=core::int, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET3|constructor#_#new#tearOff(core::int id) → self::ET3 /* = core::int */
+static extension-type-member method ET3|constructor#_#new#tearOff(core::int id) → self::ET3% /* erasure=core::int, declared=! */
   return self::ET3|constructor#(id);
-static abstract extension-type-member method ET3|setter(lowered final self::ET3 /* = core::int */ #this, core::int x) → void;
-static extension-type-member method ET3|get#setter(lowered final self::ET3 /* = core::int */ #this) → (core::int) → void
+static abstract extension-type-member method ET3|setter(lowered final self::ET3% /* erasure=core::int, declared=! */ #this, core::int x) → void;
+static extension-type-member method ET3|get#setter(lowered final self::ET3% /* erasure=core::int, declared=! */ #this) → (core::int) → void
   return (core::int x) → void => self::ET3|setter(#this, x);
-static extension-type-member method ET4|constructor#<T extends core::Object? = dynamic>(self::ET4|constructor#::T% id) → self::ET4<self::ET4|constructor#::T%> /* = self::ET4|constructor#::T% */ {
-  lowered final self::ET4<self::ET4|constructor#::T%> /* = self::ET4|constructor#::T% */ #this = id;
+static extension-type-member method ET4|constructor#<T extends core::Object? = dynamic>(self::ET4|constructor#::T% id) → self::ET4<self::ET4|constructor#::T%>% /* erasure=self::ET4|constructor#::T%, declared=! */ {
+  lowered final self::ET4<self::ET4|constructor#::T%>% /* erasure=self::ET4|constructor#::T%, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET4|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET4|constructor#_#new#tearOff::T% id) → self::ET4<self::ET4|constructor#_#new#tearOff::T%> /* = self::ET4|constructor#_#new#tearOff::T% */
+static extension-type-member method ET4|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET4|constructor#_#new#tearOff::T% id) → self::ET4<self::ET4|constructor#_#new#tearOff::T%>% /* erasure=self::ET4|constructor#_#new#tearOff::T%, declared=! */
   return self::ET4|constructor#<self::ET4|constructor#_#new#tearOff::T%>(id);
-static abstract extension-type-member method ET4|method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|method::T%> /* = self::ET4|method::T% */ #this) → void;
-static extension-type-member method ET4|get#method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|get#method::T%> /* = self::ET4|get#method::T% */ #this) → () → void
+static abstract extension-type-member method ET4|method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|method::T%>% /* erasure=self::ET4|method::T%, declared=! */ #this) → void;
+static extension-type-member method ET4|get#method<T extends core::Object? = dynamic>(lowered final self::ET4<self::ET4|get#method::T%>% /* erasure=self::ET4|get#method::T%, declared=! */ #this) → () → void
   return () → void => self::ET4|method<self::ET4|get#method::T%>(#this);
-static extension-type-member method ET5|constructor#(core::int id) → self::ET5 /* = core::int */ {
-  lowered final self::ET5 /* = core::int */ #this = id;
+static extension-type-member method ET5|constructor#(core::int id) → self::ET5% /* erasure=core::int, declared=! */ {
+  lowered final self::ET5% /* erasure=core::int, declared=! */ #this = id;
   return #this;
 }
-static extension-type-member method ET5|constructor#_#new#tearOff(core::int id) → self::ET5 /* = core::int */
+static extension-type-member method ET5|constructor#_#new#tearOff(core::int id) → self::ET5% /* erasure=core::int, declared=! */
   return self::ET5|constructor#(id);
-static abstract extension-type-member method ET5|+(lowered final self::ET5 /* = core::int */ #this, core::int other) → core::int;
-static extension-type-member method ET6|constructor#(self::A id) → self::ET6 /* = self::A */ {
-  lowered final self::ET6 /* = self::A */ #this = id;
+static abstract extension-type-member method ET5|+(lowered final self::ET5% /* erasure=core::int, declared=! */ #this, core::int other) → core::int;
+static extension-type-member method ET6|constructor#(self::A id) → self::ET6 /* erasure=self::A */ {
+  lowered final self::ET6 /* erasure=self::A */ #this = id;
   return #this;
 }
-static extension-type-member method ET6|constructor#_#new#tearOff(self::A id) → self::ET6 /* = self::A */
+static extension-type-member method ET6|constructor#_#new#tearOff(self::A id) → self::ET6 /* erasure=self::A */
   return self::ET6|constructor#(id);
-static abstract extension-type-member method ET6|method(lowered final self::ET6 /* = self::A */ #this) → core::int;
-static extension-type-member method ET6|get#method(lowered final self::ET6 /* = self::A */ #this) → () → core::int
+static abstract extension-type-member method ET6|method(lowered final self::ET6 /* erasure=self::A */ #this) → core::int;
+static extension-type-member method ET6|get#method(lowered final self::ET6 /* erasure=self::A */ #this) → () → core::int
   return () → core::int => self::ET6|method(#this);
-static abstract extension-type-member method ET6|get#getter(lowered final self::ET6 /* = self::A */ #this) → core::int;
-static abstract extension-type-member method ET6|set#setter(lowered final self::ET6 /* = self::A */ #this, core::int v) → void;
+static abstract extension-type-member method ET6|get#getter(lowered final self::ET6 /* erasure=self::A */ #this) → core::int;
+static abstract extension-type-member method ET6|set#setter(lowered final self::ET6 /* erasure=self::A */ #this, core::int v) → void;
 static abstract extension-member get E|m() → core::int;
 static abstract extension-member set E|m(synthesized core::int #externalFieldValue) → void;
 static abstract extension-member method E|method(lowered final self::A #this) → core::int;

pkg/front_end/testcases/extension_types/access_non_extension_type_members.dart.strong.expect

@@ -25,27 +25,27 @@ extension type E(self::B it) implements self::B {
   constructor • = self::E|constructor#;
   constructor tearoff • = self::E|constructor#_#new#tearOff;
 }
-extension type F(self::B it) implements self::E /* = self::B */ {
+extension type F(self::B it) implements self::E /* erasure=self::B */ {
   abstract extension-type-member representation-field get it() → self::B;
   constructor • = self::F|constructor#;
   constructor tearoff • = self::F|constructor#_#new#tearOff;
 }
-static extension-type-member method E|constructor#(self::B it) → self::E /* = self::B */ {
-  lowered final self::E /* = self::B */ #this = it;
+static extension-type-member method E|constructor#(self::B it) → self::E /* erasure=self::B */ {
+  lowered final self::E /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* = self::B */
+static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* erasure=self::B */
   return self::E|constructor#(it);
-static extension-type-member method F|constructor#(self::B it) → self::F /* = self::B */ {
-  lowered final self::F /* = self::B */ #this = it;
+static extension-type-member method F|constructor#(self::B it) → self::F /* erasure=self::B */ {
+  lowered final self::F /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* = self::B */
+static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* erasure=self::B */
   return self::F|constructor#(it);
 static method main() → dynamic {
   self::B b = new self::B::•();
-  self::E /* = self::B */ e = self::E|constructor#(b);
-  self::F /* = self::B */ f = self::F|constructor#(b);
+  self::E /* erasure=self::B */ e = self::E|constructor#(b);
+  self::F /* erasure=self::B */ f = self::F|constructor#(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});

pkg/front_end/testcases/extension_types/access_non_extension_type_members.dart.strong.transformed.expect

@@ -25,27 +25,27 @@ extension type E(self::B it) implements self::B {
   constructor • = self::E|constructor#;
   constructor tearoff • = self::E|constructor#_#new#tearOff;
 }
-extension type F(self::B it) implements self::E /* = self::B */ {
+extension type F(self::B it) implements self::E /* erasure=self::B */ {
   abstract extension-type-member representation-field get it() → self::B;
   constructor • = self::F|constructor#;
   constructor tearoff • = self::F|constructor#_#new#tearOff;
 }
-static extension-type-member method E|constructor#(self::B it) → self::E /* = self::B */ {
-  lowered final self::E /* = self::B */ #this = it;
+static extension-type-member method E|constructor#(self::B it) → self::E /* erasure=self::B */ {
+  lowered final self::E /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* = self::B */
+static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* erasure=self::B */
   return self::E|constructor#(it);
-static extension-type-member method F|constructor#(self::B it) → self::F /* = self::B */ {
-  lowered final self::F /* = self::B */ #this = it;
+static extension-type-member method F|constructor#(self::B it) → self::F /* erasure=self::B */ {
+  lowered final self::F /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* = self::B */
+static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* erasure=self::B */
   return self::F|constructor#(it);
 static method main() → dynamic {
   self::B b = new self::B::•();
-  self::E /* = self::B */ e = self::E|constructor#(b);
-  self::F /* = self::B */ f = self::F|constructor#(b);
+  self::E /* erasure=self::B */ e = self::E|constructor#(b);
+  self::F /* erasure=self::B */ f = self::F|constructor#(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});

pkg/front_end/testcases/extension_types/access_non_extension_type_members.dart.weak.expect

@@ -25,27 +25,27 @@ extension type E(self::B it) implements self::B {
   constructor • = self::E|constructor#;
   constructor tearoff • = self::E|constructor#_#new#tearOff;
 }
-extension type F(self::B it) implements self::E /* = self::B */ {
+extension type F(self::B it) implements self::E /* erasure=self::B */ {
   abstract extension-type-member representation-field get it() → self::B;
   constructor • = self::F|constructor#;
   constructor tearoff • = self::F|constructor#_#new#tearOff;
 }
-static extension-type-member method E|constructor#(self::B it) → self::E /* = self::B */ {
-  lowered final self::E /* = self::B */ #this = it;
+static extension-type-member method E|constructor#(self::B it) → self::E /* erasure=self::B */ {
+  lowered final self::E /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* = self::B */
+static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* erasure=self::B */
   return self::E|constructor#(it);
-static extension-type-member method F|constructor#(self::B it) → self::F /* = self::B */ {
-  lowered final self::F /* = self::B */ #this = it;
+static extension-type-member method F|constructor#(self::B it) → self::F /* erasure=self::B */ {
+  lowered final self::F /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* = self::B */
+static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* erasure=self::B */
   return self::F|constructor#(it);
 static method main() → dynamic {
   self::B b = new self::B::•();
-  self::E /* = self::B */ e = self::E|constructor#(b);
-  self::F /* = self::B */ f = self::F|constructor#(b);
+  self::E /* erasure=self::B */ e = self::E|constructor#(b);
+  self::F /* erasure=self::B */ f = self::F|constructor#(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});

pkg/front_end/testcases/extension_types/access_non_extension_type_members.dart.weak.modular.expect

@@ -25,27 +25,27 @@ extension type E(self::B it) implements self::B {
   constructor • = self::E|constructor#;
   constructor tearoff • = self::E|constructor#_#new#tearOff;
 }
-extension type F(self::B it) implements self::E /* = self::B */ {
+extension type F(self::B it) implements self::E /* erasure=self::B */ {
   abstract extension-type-member representation-field get it() → self::B;
   constructor • = self::F|constructor#;
   constructor tearoff • = self::F|constructor#_#new#tearOff;
 }
-static extension-type-member method E|constructor#(self::B it) → self::E /* = self::B */ {
-  lowered final self::E /* = self::B */ #this = it;
+static extension-type-member method E|constructor#(self::B it) → self::E /* erasure=self::B */ {
+  lowered final self::E /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* = self::B */
+static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* erasure=self::B */
   return self::E|constructor#(it);
-static extension-type-member method F|constructor#(self::B it) → self::F /* = self::B */ {
-  lowered final self::F /* = self::B */ #this = it;
+static extension-type-member method F|constructor#(self::B it) → self::F /* erasure=self::B */ {
+  lowered final self::F /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* = self::B */
+static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* erasure=self::B */
   return self::F|constructor#(it);
 static method main() → dynamic {
   self::B b = new self::B::•();
-  self::E /* = self::B */ e = self::E|constructor#(b);
-  self::F /* = self::B */ f = self::F|constructor#(b);
+  self::E /* erasure=self::B */ e = self::E|constructor#(b);
+  self::F /* erasure=self::B */ f = self::F|constructor#(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});

pkg/front_end/testcases/extension_types/access_non_extension_type_members.dart.weak.outline.expect

@@ -22,18 +22,18 @@ extension type E(self::B it) implements self::B {
   constructor • = self::E|constructor#;
   constructor tearoff • = self::E|constructor#_#new#tearOff;
 }
-extension type F(self::B it) implements self::E /* = self::B */ {
+extension type F(self::B it) implements self::E /* erasure=self::B */ {
   abstract extension-type-member representation-field get it() → self::B;
   constructor • = self::F|constructor#;
   constructor tearoff • = self::F|constructor#_#new#tearOff;
 }
-static extension-type-member method E|constructor#(self::B it) → self::E /* = self::B */
+static extension-type-member method E|constructor#(self::B it) → self::E /* erasure=self::B */
   ;
-static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* = self::B */
+static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* erasure=self::B */
   return self::E|constructor#(it);
-static extension-type-member method F|constructor#(self::B it) → self::F /* = self::B */
+static extension-type-member method F|constructor#(self::B it) → self::F /* erasure=self::B */
   ;
-static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* = self::B */
+static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* erasure=self::B */
   return self::F|constructor#(it);
 static method main() → dynamic
   ;

pkg/front_end/testcases/extension_types/access_non_extension_type_members.dart.weak.transformed.expect

@@ -25,27 +25,27 @@ extension type E(self::B it) implements self::B {
   constructor • = self::E|constructor#;
   constructor tearoff • = self::E|constructor#_#new#tearOff;
 }
-extension type F(self::B it) implements self::E /* = self::B */ {
+extension type F(self::B it) implements self::E /* erasure=self::B */ {
   abstract extension-type-member representation-field get it() → self::B;
   constructor • = self::F|constructor#;
   constructor tearoff • = self::F|constructor#_#new#tearOff;
 }
-static extension-type-member method E|constructor#(self::B it) → self::E /* = self::B */ {
-  lowered final self::E /* = self::B */ #this = it;
+static extension-type-member method E|constructor#(self::B it) → self::E /* erasure=self::B */ {
+  lowered final self::E /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* = self::B */
+static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* erasure=self::B */
   return self::E|constructor#(it);
-static extension-type-member method F|constructor#(self::B it) → self::F /* = self::B */ {
-  lowered final self::F /* = self::B */ #this = it;
+static extension-type-member method F|constructor#(self::B it) → self::F /* erasure=self::B */ {
+  lowered final self::F /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* = self::B */
+static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* erasure=self::B */
   return self::F|constructor#(it);
 static method main() → dynamic {
   self::B b = new self::B::•();
-  self::E /* = self::B */ e = self::E|constructor#(b);
-  self::F /* = self::B */ f = self::F|constructor#(b);
+  self::E /* erasure=self::B */ e = self::E|constructor#(b);
+  self::F /* erasure=self::B */ f = self::F|constructor#(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});

pkg/front_end/testcases/extension_types/aliased_member_access.dart.strong.expect

@@ -29,8 +29,8 @@ library;
 import self as self;
 import "dart:core" as core;
 
-typedef A = self::B /* = core::int */;
-typedef C<X extends core::num> = self::D<X> /* = X */;
+typedef A = self::B% /* erasure=core::int, declared=! */;
+typedef C<X extends core::num> = self::D<X>% /* erasure=X, declared=! */;
 typedef E<X extends core::num> = self::F<X>;
 class F<Z extends core::Object? = dynamic> extends core::Object {
   constructor •(self::F::Z% i) → self::F<self::F::Z%>
@@ -58,33 +58,33 @@ extension type D<Y extends core::Object? = dynamic>(Y% i) {
   constructor named = self::D|constructor#named;
   constructor tearoff named = self::D|constructor#_#named#tearOff;
 }
-static extension-type-member method B|constructor#(core::int i) → self::B /* = core::int */ {
-  lowered final self::B /* = core::int */ #this = i;
+static extension-type-member method B|constructor#(core::int i) → self::B% /* erasure=core::int, declared=! */ {
+  lowered final self::B% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method B|constructor#_#new#tearOff(core::int i) → self::B /* = core::int */
+static extension-type-member method B|constructor#_#new#tearOff(core::int i) → self::B% /* erasure=core::int, declared=! */
   return self::B|constructor#(i);
-static extension-type-member method B|constructor#named(core::int i) → self::B /* = core::int */ {
-  lowered final self::B /* = core::int */ #this = i;
+static extension-type-member method B|constructor#named(core::int i) → self::B% /* erasure=core::int, declared=! */ {
+  lowered final self::B% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B /* = core::int */
+static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B% /* erasure=core::int, declared=! */
   return self::B|constructor#named(i);
-static extension-type-member method B|method(core::int i) → self::B /* = core::int */
+static extension-type-member method B|method(core::int i) → self::B% /* erasure=core::int, declared=! */
   return self::B|constructor#(i);
-static extension-type-member method D|constructor#<Y extends core::Object? = dynamic>(self::D|constructor#::Y% i) → self::D<self::D|constructor#::Y%> /* = self::D|constructor#::Y% */ {
-  lowered final self::D<self::D|constructor#::Y%> /* = self::D|constructor#::Y% */ #this = i;
+static extension-type-member method D|constructor#<Y extends core::Object? = dynamic>(self::D|constructor#::Y% i) → self::D<self::D|constructor#::Y%>% /* erasure=self::D|constructor#::Y%, declared=! */ {
+  lowered final self::D<self::D|constructor#::Y%>% /* erasure=self::D|constructor#::Y%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method D|constructor#_#new#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#new#tearOff::Y% i) → self::D<self::D|constructor#_#new#tearOff::Y%> /* = self::D|constructor#_#new#tearOff::Y% */
+static extension-type-member method D|constructor#_#new#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#new#tearOff::Y% i) → self::D<self::D|constructor#_#new#tearOff::Y%>% /* erasure=self::D|constructor#_#new#tearOff::Y%, declared=! */
   return self::D|constructor#<self::D|constructor#_#new#tearOff::Y%>(i);
-static extension-type-member method D|constructor#named<Y extends core::Object? = dynamic>(self::D|constructor#named::Y% i) → self::D<self::D|constructor#named::Y%> /* = self::D|constructor#named::Y% */ {
-  lowered final self::D<self::D|constructor#named::Y%> /* = self::D|constructor#named::Y% */ #this = i;
+static extension-type-member method D|constructor#named<Y extends core::Object? = dynamic>(self::D|constructor#named::Y% i) → self::D<self::D|constructor#named::Y%>% /* erasure=self::D|constructor#named::Y%, declared=! */ {
+  lowered final self::D<self::D|constructor#named::Y%>% /* erasure=self::D|constructor#named::Y%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method D|constructor#_#named#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#named#tearOff::Y% i) → self::D<self::D|constructor#_#named#tearOff::Y%> /* = self::D|constructor#_#named#tearOff::Y% */
+static extension-type-member method D|constructor#_#named#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#named#tearOff::Y% i) → self::D<self::D|constructor#_#named#tearOff::Y%>% /* erasure=self::D|constructor#_#named#tearOff::Y%, declared=! */
   return self::D|constructor#named<self::D|constructor#_#named#tearOff::Y%>(i);
-static extension-type-member method D|method<Y extends core::Object? = dynamic>(self::D|method::Y% i) → self::D<self::D|method::Y%> /* = self::D|method::Y% */
+static extension-type-member method D|method<Y extends core::Object? = dynamic>(self::D|method::Y% i) → self::D<self::D|method::Y%>% /* erasure=self::D|method::Y%, declared=! */
   return self::D|constructor#<self::D|method::Y%>(i);
 static method method() → dynamic {
   self::B|constructor#(0);
@@ -136,9 +136,9 @@ static method method() → dynamic {
   new F.method(2); // Error
         ^^^^^^";
 }
-static method _#C#new#tearOff<X extends core::num>(self::_#C#new#tearOff::X i) → self::D<self::_#C#new#tearOff::X> /* = self::_#C#new#tearOff::X */
+static method _#C#new#tearOff<X extends core::num>(self::_#C#new#tearOff::X i) → self::D<self::_#C#new#tearOff::X>% /* erasure=self::_#C#new#tearOff::X, declared=! */
   return self::D|constructor#<self::_#C#new#tearOff::X>(i);
-static method _#C#named#tearOff<X extends core::num>(self::_#C#named#tearOff::X i) → self::D<self::_#C#named#tearOff::X> /* = self::_#C#named#tearOff::X */
+static method _#C#named#tearOff<X extends core::num>(self::_#C#named#tearOff::X i) → self::D<self::_#C#named#tearOff::X>% /* erasure=self::_#C#named#tearOff::X, declared=! */
   return self::D|constructor#named<self::_#C#named#tearOff::X>(i);
 static method _#E#new#tearOff<X extends core::num>(self::_#E#new#tearOff::X i) → self::F<self::_#E#new#tearOff::X>
   return new self::F::•<self::_#E#new#tearOff::X>(i);

pkg/front_end/testcases/extension_types/aliased_member_access.dart.strong.transformed.expect

@@ -29,8 +29,8 @@ library;
 import self as self;
 import "dart:core" as core;
 
-typedef A = self::B /* = core::int */;
-typedef C<X extends core::num> = self::D<X> /* = X */;
+typedef A = self::B% /* erasure=core::int, declared=! */;
+typedef C<X extends core::num> = self::D<X>% /* erasure=X, declared=! */;
 typedef E<X extends core::num> = self::F<X>;
 class F<Z extends core::Object? = dynamic> extends core::Object {
   constructor •(self::F::Z% i) → self::F<self::F::Z%>
@@ -58,33 +58,33 @@ extension type D<Y extends core::Object? = dynamic>(Y% i) {
   constructor named = self::D|constructor#named;
   constructor tearoff named = self::D|constructor#_#named#tearOff;
 }
-static extension-type-member method B|constructor#(core::int i) → self::B /* = core::int */ {
-  lowered final self::B /* = core::int */ #this = i;
+static extension-type-member method B|constructor#(core::int i) → self::B% /* erasure=core::int, declared=! */ {
+  lowered final self::B% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method B|constructor#_#new#tearOff(core::int i) → self::B /* = core::int */
+static extension-type-member method B|constructor#_#new#tearOff(core::int i) → self::B% /* erasure=core::int, declared=! */
   return self::B|constructor#(i);
-static extension-type-member method B|constructor#named(core::int i) → self::B /* = core::int */ {
-  lowered final self::B /* = core::int */ #this = i;
+static extension-type-member method B|constructor#named(core::int i) → self::B% /* erasure=core::int, declared=! */ {
+  lowered final self::B% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B /* = core::int */
+static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B% /* erasure=core::int, declared=! */
   return self::B|constructor#named(i);
-static extension-type-member method B|method(core::int i) → self::B /* = core::int */
+static extension-type-member method B|method(core::int i) → self::B% /* erasure=core::int, declared=! */
   return self::B|constructor#(i);
-static extension-type-member method D|constructor#<Y extends core::Object? = dynamic>(self::D|constructor#::Y% i) → self::D<self::D|constructor#::Y%> /* = self::D|constructor#::Y% */ {
-  lowered final self::D<self::D|constructor#::Y%> /* = self::D|constructor#::Y% */ #this = i;
+static extension-type-member method D|constructor#<Y extends core::Object? = dynamic>(self::D|constructor#::Y% i) → self::D<self::D|constructor#::Y%>% /* erasure=self::D|constructor#::Y%, declared=! */ {
+  lowered final self::D<self::D|constructor#::Y%>% /* erasure=self::D|constructor#::Y%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method D|constructor#_#new#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#new#tearOff::Y% i) → self::D<self::D|constructor#_#new#tearOff::Y%> /* = self::D|constructor#_#new#tearOff::Y% */
+static extension-type-member method D|constructor#_#new#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#new#tearOff::Y% i) → self::D<self::D|constructor#_#new#tearOff::Y%>% /* erasure=self::D|constructor#_#new#tearOff::Y%, declared=! */
   return self::D|constructor#<self::D|constructor#_#new#tearOff::Y%>(i);
-static extension-type-member method D|constructor#named<Y extends core::Object? = dynamic>(self::D|constructor#named::Y% i) → self::D<self::D|constructor#named::Y%> /* = self::D|constructor#named::Y% */ {
-  lowered final self::D<self::D|constructor#named::Y%> /* = self::D|constructor#named::Y% */ #this = i;
+static extension-type-member method D|constructor#named<Y extends core::Object? = dynamic>(self::D|constructor#named::Y% i) → self::D<self::D|constructor#named::Y%>% /* erasure=self::D|constructor#named::Y%, declared=! */ {
+  lowered final self::D<self::D|constructor#named::Y%>% /* erasure=self::D|constructor#named::Y%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method D|constructor#_#named#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#named#tearOff::Y% i) → self::D<self::D|constructor#_#named#tearOff::Y%> /* = self::D|constructor#_#named#tearOff::Y% */
+static extension-type-member method D|constructor#_#named#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#named#tearOff::Y% i) → self::D<self::D|constructor#_#named#tearOff::Y%>% /* erasure=self::D|constructor#_#named#tearOff::Y%, declared=! */
   return self::D|constructor#named<self::D|constructor#_#named#tearOff::Y%>(i);
-static extension-type-member method D|method<Y extends core::Object? = dynamic>(self::D|method::Y% i) → self::D<self::D|method::Y%> /* = self::D|method::Y% */
+static extension-type-member method D|method<Y extends core::Object? = dynamic>(self::D|method::Y% i) → self::D<self::D|method::Y%>% /* erasure=self::D|method::Y%, declared=! */
   return self::D|constructor#<self::D|method::Y%>(i);
 static method method() → dynamic {
   self::B|constructor#(0);
@@ -136,9 +136,9 @@ static method method() → dynamic {
   new F.method(2); // Error
         ^^^^^^";
 }
-static method _#C#new#tearOff<X extends core::num>(self::_#C#new#tearOff::X i) → self::D<self::_#C#new#tearOff::X> /* = self::_#C#new#tearOff::X */
+static method _#C#new#tearOff<X extends core::num>(self::_#C#new#tearOff::X i) → self::D<self::_#C#new#tearOff::X>% /* erasure=self::_#C#new#tearOff::X, declared=! */
   return self::D|constructor#<self::_#C#new#tearOff::X>(i);
-static method _#C#named#tearOff<X extends core::num>(self::_#C#named#tearOff::X i) → self::D<self::_#C#named#tearOff::X> /* = self::_#C#named#tearOff::X */
+static method _#C#named#tearOff<X extends core::num>(self::_#C#named#tearOff::X i) → self::D<self::_#C#named#tearOff::X>% /* erasure=self::_#C#named#tearOff::X, declared=! */
   return self::D|constructor#named<self::_#C#named#tearOff::X>(i);
 static method _#E#new#tearOff<X extends core::num>(self::_#E#new#tearOff::X i) → self::F<self::_#E#new#tearOff::X>
   return new self::F::•<self::_#E#new#tearOff::X>(i);

pkg/front_end/testcases/extension_types/aliased_member_access.dart.weak.expect

@@ -29,8 +29,8 @@ library;
 import self as self;
 import "dart:core" as core;
 
-typedef A = self::B /* = core::int */;
-typedef C<X extends core::num> = self::D<X> /* = X */;
+typedef A = self::B% /* erasure=core::int, declared=! */;
+typedef C<X extends core::num> = self::D<X>% /* erasure=X, declared=! */;
 typedef E<X extends core::num> = self::F<X>;
 class F<Z extends core::Object? = dynamic> extends core::Object {
   constructor •(self::F::Z% i) → self::F<self::F::Z%>
@@ -58,33 +58,33 @@ extension type D<Y extends core::Object? = dynamic>(Y% i) {
   constructor named = self::D|constructor#named;
   constructor tearoff named = self::D|constructor#_#named#tearOff;
 }
-static extension-type-member method B|constructor#(core::int i) → self::B /* = core::int */ {
-  lowered final self::B /* = core::int */ #this = i;
+static extension-type-member method B|constructor#(core::int i) → self::B% /* erasure=core::int, declared=! */ {
+  lowered final self::B% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method B|constructor#_#new#tearOff(core::int i) → self::B /* = core::int */
+static extension-type-member method B|constructor#_#new#tearOff(core::int i) → self::B% /* erasure=core::int, declared=! */
   return self::B|constructor#(i);
-static extension-type-member method B|constructor#named(core::int i) → self::B /* = core::int */ {
-  lowered final self::B /* = core::int */ #this = i;
+static extension-type-member method B|constructor#named(core::int i) → self::B% /* erasure=core::int, declared=! */ {
+  lowered final self::B% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B /* = core::int */
+static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B% /* erasure=core::int, declared=! */
   return self::B|constructor#named(i);
-static extension-type-member method B|method(core::int i) → self::B /* = core::int */
+static extension-type-member method B|method(core::int i) → self::B% /* erasure=core::int, declared=! */
   return self::B|constructor#(i);
-static extension-type-member method D|constructor#<Y extends core::Object? = dynamic>(self::D|constructor#::Y% i) → self::D<self::D|constructor#::Y%> /* = self::D|constructor#::Y% */ {
-  lowered final self::D<self::D|constructor#::Y%> /* = self::D|constructor#::Y% */ #this = i;
+static extension-type-member method D|constructor#<Y extends core::Object? = dynamic>(self::D|constructor#::Y% i) → self::D<self::D|constructor#::Y%>% /* erasure=self::D|constructor#::Y%, declared=! */ {
+  lowered final self::D<self::D|constructor#::Y%>% /* erasure=self::D|constructor#::Y%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method D|constructor#_#new#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#new#tearOff::Y% i) → self::D<self::D|constructor#_#new#tearOff::Y%> /* = self::D|constructor#_#new#tearOff::Y% */
+static extension-type-member method D|constructor#_#new#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#new#tearOff::Y% i) → self::D<self::D|constructor#_#new#tearOff::Y%>% /* erasure=self::D|constructor#_#new#tearOff::Y%, declared=! */
   return self::D|constructor#<self::D|constructor#_#new#tearOff::Y%>(i);
-static extension-type-member method D|constructor#named<Y extends core::Object? = dynamic>(self::D|constructor#named::Y% i) → self::D<self::D|constructor#named::Y%> /* = self::D|constructor#named::Y% */ {
-  lowered final self::D<self::D|constructor#named::Y%> /* = self::D|constructor#named::Y% */ #this = i;
+static extension-type-member method D|constructor#named<Y extends core::Object? = dynamic>(self::D|constructor#named::Y% i) → self::D<self::D|constructor#named::Y%>% /* erasure=self::D|constructor#named::Y%, declared=! */ {
+  lowered final self::D<self::D|constructor#named::Y%>% /* erasure=self::D|constructor#named::Y%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method D|constructor#_#named#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#named#tearOff::Y% i) → self::D<self::D|constructor#_#named#tearOff::Y%> /* = self::D|constructor#_#named#tearOff::Y% */
+static extension-type-member method D|constructor#_#named#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#named#tearOff::Y% i) → self::D<self::D|constructor#_#named#tearOff::Y%>% /* erasure=self::D|constructor#_#named#tearOff::Y%, declared=! */
   return self::D|constructor#named<self::D|constructor#_#named#tearOff::Y%>(i);
-static extension-type-member method D|method<Y extends core::Object? = dynamic>(self::D|method::Y% i) → self::D<self::D|method::Y%> /* = self::D|method::Y% */
+static extension-type-member method D|method<Y extends core::Object? = dynamic>(self::D|method::Y% i) → self::D<self::D|method::Y%>% /* erasure=self::D|method::Y%, declared=! */
   return self::D|constructor#<self::D|method::Y%>(i);
 static method method() → dynamic {
   self::B|constructor#(0);
@@ -136,9 +136,9 @@ static method method() → dynamic {
   new F.method(2); // Error
         ^^^^^^";
 }
-static method _#C#new#tearOff<X extends core::num>(self::_#C#new#tearOff::X i) → self::D<self::_#C#new#tearOff::X> /* = self::_#C#new#tearOff::X */
+static method _#C#new#tearOff<X extends core::num>(self::_#C#new#tearOff::X i) → self::D<self::_#C#new#tearOff::X>% /* erasure=self::_#C#new#tearOff::X, declared=! */
   return self::D|constructor#<self::_#C#new#tearOff::X>(i);
-static method _#C#named#tearOff<X extends core::num>(self::_#C#named#tearOff::X i) → self::D<self::_#C#named#tearOff::X> /* = self::_#C#named#tearOff::X */
+static method _#C#named#tearOff<X extends core::num>(self::_#C#named#tearOff::X i) → self::D<self::_#C#named#tearOff::X>% /* erasure=self::_#C#named#tearOff::X, declared=! */
   return self::D|constructor#named<self::_#C#named#tearOff::X>(i);
 static method _#E#new#tearOff<X extends core::num>(self::_#E#new#tearOff::X i) → self::F<self::_#E#new#tearOff::X>
   return new self::F::•<self::_#E#new#tearOff::X>(i);

pkg/front_end/testcases/extension_types/aliased_member_access.dart.weak.modular.expect

@@ -29,8 +29,8 @@ library;
 import self as self;
 import "dart:core" as core;
 
-typedef A = self::B /* = core::int */;
-typedef C<X extends core::num> = self::D<X> /* = X */;
+typedef A = self::B% /* erasure=core::int, declared=! */;
+typedef C<X extends core::num> = self::D<X>% /* erasure=X, declared=! */;
 typedef E<X extends core::num> = self::F<X>;
 class F<Z extends core::Object? = dynamic> extends core::Object {
   constructor •(self::F::Z% i) → self::F<self::F::Z%>
@@ -58,33 +58,33 @@ extension type D<Y extends core::Object? = dynamic>(Y% i) {
   constructor named = self::D|constructor#named;
   constructor tearoff named = self::D|constructor#_#named#tearOff;
 }
-static extension-type-member method B|constructor#(core::int i) → self::B /* = core::int */ {
-  lowered final self::B /* = core::int */ #this = i;
+static extension-type-member method B|constructor#(core::int i) → self::B% /* erasure=core::int, declared=! */ {
+  lowered final self::B% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method B|constructor#_#new#tearOff(core::int i) → self::B /* = core::int */
+static extension-type-member method B|constructor#_#new#tearOff(core::int i) → self::B% /* erasure=core::int, declared=! */
   return self::B|constructor#(i);
-static extension-type-member method B|constructor#named(core::int i) → self::B /* = core::int */ {
-  lowered final self::B /* = core::int */ #this = i;
+static extension-type-member method B|constructor#named(core::int i) → self::B% /* erasure=core::int, declared=! */ {
+  lowered final self::B% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B /* = core::int */
+static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B% /* erasure=core::int, declared=! */
   return self::B|constructor#named(i);
-static extension-type-member method B|method(core::int i) → self::B /* = core::int */
+static extension-type-member method B|method(core::int i) → self::B% /* erasure=core::int, declared=! */
   return self::B|constructor#(i);
-static extension-type-member method D|constructor#<Y extends core::Object? = dynamic>(self::D|constructor#::Y% i) → self::D<self::D|constructor#::Y%> /* = self::D|constructor#::Y% */ {
-  lowered final self::D<self::D|constructor#::Y%> /* = self::D|constructor#::Y% */ #this = i;
+static extension-type-member method D|constructor#<Y extends core::Object? = dynamic>(self::D|constructor#::Y% i) → self::D<self::D|constructor#::Y%>% /* erasure=self::D|constructor#::Y%, declared=! */ {
+  lowered final self::D<self::D|constructor#::Y%>% /* erasure=self::D|constructor#::Y%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method D|constructor#_#new#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#new#tearOff::Y% i) → self::D<self::D|constructor#_#new#tearOff::Y%> /* = self::D|constructor#_#new#tearOff::Y% */
+static extension-type-member method D|constructor#_#new#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#new#tearOff::Y% i) → self::D<self::D|constructor#_#new#tearOff::Y%>% /* erasure=self::D|constructor#_#new#tearOff::Y%, declared=! */
   return self::D|constructor#<self::D|constructor#_#new#tearOff::Y%>(i);
-static extension-type-member method D|constructor#named<Y extends core::Object? = dynamic>(self::D|constructor#named::Y% i) → self::D<self::D|constructor#named::Y%> /* = self::D|constructor#named::Y% */ {
-  lowered final self::D<self::D|constructor#named::Y%> /* = self::D|constructor#named::Y% */ #this = i;
+static extension-type-member method D|constructor#named<Y extends core::Object? = dynamic>(self::D|constructor#named::Y% i) → self::D<self::D|constructor#named::Y%>% /* erasure=self::D|constructor#named::Y%, declared=! */ {
+  lowered final self::D<self::D|constructor#named::Y%>% /* erasure=self::D|constructor#named::Y%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method D|constructor#_#named#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#named#tearOff::Y% i) → self::D<self::D|constructor#_#named#tearOff::Y%> /* = self::D|constructor#_#named#tearOff::Y% */
+static extension-type-member method D|constructor#_#named#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#named#tearOff::Y% i) → self::D<self::D|constructor#_#named#tearOff::Y%>% /* erasure=self::D|constructor#_#named#tearOff::Y%, declared=! */
   return self::D|constructor#named<self::D|constructor#_#named#tearOff::Y%>(i);
-static extension-type-member method D|method<Y extends core::Object? = dynamic>(self::D|method::Y% i) → self::D<self::D|method::Y%> /* = self::D|method::Y% */
+static extension-type-member method D|method<Y extends core::Object? = dynamic>(self::D|method::Y% i) → self::D<self::D|method::Y%>% /* erasure=self::D|method::Y%, declared=! */
   return self::D|constructor#<self::D|method::Y%>(i);
 static method method() → dynamic {
   self::B|constructor#(0);
@@ -136,9 +136,9 @@ static method method() → dynamic {
   new F.method(2); // Error
         ^^^^^^";
 }
-static method _#C#new#tearOff<X extends core::num>(self::_#C#new#tearOff::X i) → self::D<self::_#C#new#tearOff::X> /* = self::_#C#new#tearOff::X */
+static method _#C#new#tearOff<X extends core::num>(self::_#C#new#tearOff::X i) → self::D<self::_#C#new#tearOff::X>% /* erasure=self::_#C#new#tearOff::X, declared=! */
   return self::D|constructor#<self::_#C#new#tearOff::X>(i);
-static method _#C#named#tearOff<X extends core::num>(self::_#C#named#tearOff::X i) → self::D<self::_#C#named#tearOff::X> /* = self::_#C#named#tearOff::X */
+static method _#C#named#tearOff<X extends core::num>(self::_#C#named#tearOff::X i) → self::D<self::_#C#named#tearOff::X>% /* erasure=self::_#C#named#tearOff::X, declared=! */
   return self::D|constructor#named<self::_#C#named#tearOff::X>(i);
 static method _#E#new#tearOff<X extends core::num>(self::_#E#new#tearOff::X i) → self::F<self::_#E#new#tearOff::X>
   return new self::F::•<self::_#E#new#tearOff::X>(i);

pkg/front_end/testcases/extension_types/aliased_member_access.dart.weak.outline.expect

@@ -2,8 +2,8 @@ library;
 import self as self;
 import "dart:core" as core;
 
-typedef A = self::B /* = core::int */;
-typedef C<X extends core::num> = self::D<X> /* = X */;
+typedef A = self::B% /* erasure=core::int, declared=! */;
+typedef C<X extends core::num> = self::D<X>% /* erasure=X, declared=! */;
 typedef E<X extends core::num> = self::F<X>;
 class F<Z extends core::Object? = dynamic> extends core::Object {
   constructor •(self::F::Z% i) → self::F<self::F::Z%>
@@ -29,31 +29,31 @@ extension type D<Y extends core::Object? = dynamic>(Y% i) {
   constructor named = self::D|constructor#named;
   constructor tearoff named = self::D|constructor#_#named#tearOff;
 }
-static extension-type-member method B|constructor#(core::int i) → self::B /* = core::int */
+static extension-type-member method B|constructor#(core::int i) → self::B% /* erasure=core::int, declared=! */
   ;
-static extension-type-member method B|constructor#_#new#tearOff(core::int i) → self::B /* = core::int */
+static extension-type-member method B|constructor#_#new#tearOff(core::int i) → self::B% /* erasure=core::int, declared=! */
   return self::B|constructor#(i);
-static extension-type-member method B|constructor#named(core::int i) → self::B /* = core::int */
+static extension-type-member method B|constructor#named(core::int i) → self::B% /* erasure=core::int, declared=! */
   ;
-static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B /* = core::int */
+static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B% /* erasure=core::int, declared=! */
   return self::B|constructor#named(i);
-static extension-type-member method B|method(core::int i) → self::B /* = core::int */
+static extension-type-member method B|method(core::int i) → self::B% /* erasure=core::int, declared=! */
   ;
-static extension-type-member method D|constructor#<Y extends core::Object? = dynamic>(self::D|constructor#::Y% i) → self::D<self::D|constructor#::Y%> /* = self::D|constructor#::Y% */
+static extension-type-member method D|constructor#<Y extends core::Object? = dynamic>(self::D|constructor#::Y% i) → self::D<self::D|constructor#::Y%>% /* erasure=self::D|constructor#::Y%, declared=! */
   ;
-static extension-type-member method D|constructor#_#new#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#new#tearOff::Y% i) → self::D<self::D|constructor#_#new#tearOff::Y%> /* = self::D|constructor#_#new#tearOff::Y% */
+static extension-type-member method D|constructor#_#new#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#new#tearOff::Y% i) → self::D<self::D|constructor#_#new#tearOff::Y%>% /* erasure=self::D|constructor#_#new#tearOff::Y%, declared=! */
   return self::D|constructor#<self::D|constructor#_#new#tearOff::Y%>(i);
-static extension-type-member method D|constructor#named<Y extends core::Object? = dynamic>(self::D|constructor#named::Y% i) → self::D<self::D|constructor#named::Y%> /* = self::D|constructor#named::Y% */
+static extension-type-member method D|constructor#named<Y extends core::Object? = dynamic>(self::D|constructor#named::Y% i) → self::D<self::D|constructor#named::Y%>% /* erasure=self::D|constructor#named::Y%, declared=! */
   ;
-static extension-type-member method D|constructor#_#named#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#named#tearOff::Y% i) → self::D<self::D|constructor#_#named#tearOff::Y%> /* = self::D|constructor#_#named#tearOff::Y% */
+static extension-type-member method D|constructor#_#named#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#named#tearOff::Y% i) → self::D<self::D|constructor#_#named#tearOff::Y%>% /* erasure=self::D|constructor#_#named#tearOff::Y%, declared=! */
   return self::D|constructor#named<self::D|constructor#_#named#tearOff::Y%>(i);
-static extension-type-member method D|method<Y extends core::Object? = dynamic>(self::D|method::Y% i) → self::D<self::D|method::Y%> /* = self::D|method::Y% */
+static extension-type-member method D|method<Y extends core::Object? = dynamic>(self::D|method::Y% i) → self::D<self::D|method::Y%>% /* erasure=self::D|method::Y%, declared=! */
   ;
 static method method() → dynamic
   ;
-static method _#C#new#tearOff<X extends core::num>(self::_#C#new#tearOff::X i) → self::D<self::_#C#new#tearOff::X> /* = self::_#C#new#tearOff::X */
+static method _#C#new#tearOff<X extends core::num>(self::_#C#new#tearOff::X i) → self::D<self::_#C#new#tearOff::X>% /* erasure=self::_#C#new#tearOff::X, declared=! */
   return self::D|constructor#<self::_#C#new#tearOff::X>(i);
-static method _#C#named#tearOff<X extends core::num>(self::_#C#named#tearOff::X i) → self::D<self::_#C#named#tearOff::X> /* = self::_#C#named#tearOff::X */
+static method _#C#named#tearOff<X extends core::num>(self::_#C#named#tearOff::X i) → self::D<self::_#C#named#tearOff::X>% /* erasure=self::_#C#named#tearOff::X, declared=! */
   return self::D|constructor#named<self::_#C#named#tearOff::X>(i);
 static method _#E#new#tearOff<X extends core::num>(self::_#E#new#tearOff::X i) → self::F<self::_#E#new#tearOff::X>
   return new self::F::•<self::_#E#new#tearOff::X>(i);

pkg/front_end/testcases/extension_types/aliased_member_access.dart.weak.transformed.expect

@@ -29,8 +29,8 @@ library;
 import self as self;
 import "dart:core" as core;
 
-typedef A = self::B /* = core::int */;
-typedef C<X extends core::num> = self::D<X> /* = X */;
+typedef A = self::B% /* erasure=core::int, declared=! */;
+typedef C<X extends core::num> = self::D<X>% /* erasure=X, declared=! */;
 typedef E<X extends core::num> = self::F<X>;
 class F<Z extends core::Object? = dynamic> extends core::Object {
   constructor •(self::F::Z% i) → self::F<self::F::Z%>
@@ -58,33 +58,33 @@ extension type D<Y extends core::Object? = dynamic>(Y% i) {
   constructor named = self::D|constructor#named;
   constructor tearoff named = self::D|constructor#_#named#tearOff;
 }
-static extension-type-member method B|constructor#(core::int i) → self::B /* = core::int */ {
-  lowered final self::B /* = core::int */ #this = i;
+static extension-type-member method B|constructor#(core::int i) → self::B% /* erasure=core::int, declared=! */ {
+  lowered final self::B% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method B|constructor#_#new#tearOff(core::int i) → self::B /* = core::int */
+static extension-type-member method B|constructor#_#new#tearOff(core::int i) → self::B% /* erasure=core::int, declared=! */
   return self::B|constructor#(i);
-static extension-type-member method B|constructor#named(core::int i) → self::B /* = core::int */ {
-  lowered final self::B /* = core::int */ #this = i;
+static extension-type-member method B|constructor#named(core::int i) → self::B% /* erasure=core::int, declared=! */ {
+  lowered final self::B% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B /* = core::int */
+static extension-type-member method B|constructor#_#named#tearOff(core::int i) → self::B% /* erasure=core::int, declared=! */
   return self::B|constructor#named(i);
-static extension-type-member method B|method(core::int i) → self::B /* = core::int */
+static extension-type-member method B|method(core::int i) → self::B% /* erasure=core::int, declared=! */
   return self::B|constructor#(i);
-static extension-type-member method D|constructor#<Y extends core::Object? = dynamic>(self::D|constructor#::Y% i) → self::D<self::D|constructor#::Y%> /* = self::D|constructor#::Y% */ {
-  lowered final self::D<self::D|constructor#::Y%> /* = self::D|constructor#::Y% */ #this = i;
+static extension-type-member method D|constructor#<Y extends core::Object? = dynamic>(self::D|constructor#::Y% i) → self::D<self::D|constructor#::Y%>% /* erasure=self::D|constructor#::Y%, declared=! */ {
+  lowered final self::D<self::D|constructor#::Y%>% /* erasure=self::D|constructor#::Y%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method D|constructor#_#new#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#new#tearOff::Y% i) → self::D<self::D|constructor#_#new#tearOff::Y%> /* = self::D|constructor#_#new#tearOff::Y% */
+static extension-type-member method D|constructor#_#new#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#new#tearOff::Y% i) → self::D<self::D|constructor#_#new#tearOff::Y%>% /* erasure=self::D|constructor#_#new#tearOff::Y%, declared=! */
   return self::D|constructor#<self::D|constructor#_#new#tearOff::Y%>(i);
-static extension-type-member method D|constructor#named<Y extends core::Object? = dynamic>(self::D|constructor#named::Y% i) → self::D<self::D|constructor#named::Y%> /* = self::D|constructor#named::Y% */ {
-  lowered final self::D<self::D|constructor#named::Y%> /* = self::D|constructor#named::Y% */ #this = i;
+static extension-type-member method D|constructor#named<Y extends core::Object? = dynamic>(self::D|constructor#named::Y% i) → self::D<self::D|constructor#named::Y%>% /* erasure=self::D|constructor#named::Y%, declared=! */ {
+  lowered final self::D<self::D|constructor#named::Y%>% /* erasure=self::D|constructor#named::Y%, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method D|constructor#_#named#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#named#tearOff::Y% i) → self::D<self::D|constructor#_#named#tearOff::Y%> /* = self::D|constructor#_#named#tearOff::Y% */
+static extension-type-member method D|constructor#_#named#tearOff<Y extends core::Object? = dynamic>(self::D|constructor#_#named#tearOff::Y% i) → self::D<self::D|constructor#_#named#tearOff::Y%>% /* erasure=self::D|constructor#_#named#tearOff::Y%, declared=! */
   return self::D|constructor#named<self::D|constructor#_#named#tearOff::Y%>(i);
-static extension-type-member method D|method<Y extends core::Object? = dynamic>(self::D|method::Y% i) → self::D<self::D|method::Y%> /* = self::D|method::Y% */
+static extension-type-member method D|method<Y extends core::Object? = dynamic>(self::D|method::Y% i) → self::D<self::D|method::Y%>% /* erasure=self::D|method::Y%, declared=! */
   return self::D|constructor#<self::D|method::Y%>(i);
 static method method() → dynamic {
   self::B|constructor#(0);
@@ -136,9 +136,9 @@ static method method() → dynamic {
   new F.method(2); // Error
         ^^^^^^";
 }
-static method _#C#new#tearOff<X extends core::num>(self::_#C#new#tearOff::X i) → self::D<self::_#C#new#tearOff::X> /* = self::_#C#new#tearOff::X */
+static method _#C#new#tearOff<X extends core::num>(self::_#C#new#tearOff::X i) → self::D<self::_#C#new#tearOff::X>% /* erasure=self::_#C#new#tearOff::X, declared=! */
   return self::D|constructor#<self::_#C#new#tearOff::X>(i);
-static method _#C#named#tearOff<X extends core::num>(self::_#C#named#tearOff::X i) → self::D<self::_#C#named#tearOff::X> /* = self::_#C#named#tearOff::X */
+static method _#C#named#tearOff<X extends core::num>(self::_#C#named#tearOff::X i) → self::D<self::_#C#named#tearOff::X>% /* erasure=self::_#C#named#tearOff::X, declared=! */
   return self::D|constructor#named<self::_#C#named#tearOff::X>(i);
 static method _#E#new#tearOff<X extends core::num>(self::_#E#new#tearOff::X i) → self::F<self::_#E#new#tearOff::X>
   return new self::F::•<self::_#E#new#tearOff::X>(i);

pkg/front_end/testcases/extension_types/annotations.dart.strong.expect

@@ -12,22 +12,22 @@ extension type A(core::int i) {
   constructor constructor = self::A|constructor#constructor;
   constructor tearoff constructor = self::A|constructor#_#constructor#tearOff;
 }
-static extension-type-member method A|constructor#(@#C2 core::int i) → self::A /* = core::int */ {
-  lowered final self::A /* = core::int */ #this = i;
+static extension-type-member method A|constructor#(@#C2 core::int i) → self::A% /* erasure=core::int, declared=! */ {
+  lowered final self::A% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method A|constructor#_#new#tearOff(core::int i) → self::A /* = core::int */
+static extension-type-member method A|constructor#_#new#tearOff(core::int i) → self::A% /* erasure=core::int, declared=! */
   return self::A|constructor#(i);
 @#C2
-static extension-type-member method A|constructor#constructor(core::int i) → self::A /* = core::int */ {
-  lowered final self::A /* = core::int */ #this = i;
+static extension-type-member method A|constructor#constructor(core::int i) → self::A% /* erasure=core::int, declared=! */ {
+  lowered final self::A% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method A|constructor#_#constructor#tearOff(core::int i) → self::A /* = core::int */
+static extension-type-member method A|constructor#_#constructor#tearOff(core::int i) → self::A% /* erasure=core::int, declared=! */
   return self::A|constructor#constructor(i);
 @#C2
-static extension-type-member method A|m(lowered final self::A /* = core::int */ #this) → void {}
-static extension-type-member method A|get#m(lowered final self::A /* = core::int */ #this) → () → void
+static extension-type-member method A|m(lowered final self::A% /* erasure=core::int, declared=! */ #this) → void {}
+static extension-type-member method A|get#m(lowered final self::A% /* erasure=core::int, declared=! */ #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {

pkg/front_end/testcases/extension_types/annotations.dart.strong.transformed.expect

@@ -12,22 +12,22 @@ extension type A(core::int i) {
   constructor constructor = self::A|constructor#constructor;
   constructor tearoff constructor = self::A|constructor#_#constructor#tearOff;
 }
-static extension-type-member method A|constructor#(@#C2 core::int i) → self::A /* = core::int */ {
-  lowered final self::A /* = core::int */ #this = i;
+static extension-type-member method A|constructor#(@#C2 core::int i) → self::A% /* erasure=core::int, declared=! */ {
+  lowered final self::A% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method A|constructor#_#new#tearOff(core::int i) → self::A /* = core::int */
+static extension-type-member method A|constructor#_#new#tearOff(core::int i) → self::A% /* erasure=core::int, declared=! */
   return self::A|constructor#(i);
 @#C2
-static extension-type-member method A|constructor#constructor(core::int i) → self::A /* = core::int */ {
-  lowered final self::A /* = core::int */ #this = i;
+static extension-type-member method A|constructor#constructor(core::int i) → self::A% /* erasure=core::int, declared=! */ {
+  lowered final self::A% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method A|constructor#_#constructor#tearOff(core::int i) → self::A /* = core::int */
+static extension-type-member method A|constructor#_#constructor#tearOff(core::int i) → self::A% /* erasure=core::int, declared=! */
   return self::A|constructor#constructor(i);
 @#C2
-static extension-type-member method A|m(lowered final self::A /* = core::int */ #this) → void {}
-static extension-type-member method A|get#m(lowered final self::A /* = core::int */ #this) → () → void
+static extension-type-member method A|m(lowered final self::A% /* erasure=core::int, declared=! */ #this) → void {}
+static extension-type-member method A|get#m(lowered final self::A% /* erasure=core::int, declared=! */ #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {

pkg/front_end/testcases/extension_types/annotations.dart.weak.expect

@@ -12,22 +12,22 @@ extension type A(core::int i) {
   constructor constructor = self::A|constructor#constructor;
   constructor tearoff constructor = self::A|constructor#_#constructor#tearOff;
 }
-static extension-type-member method A|constructor#(@#C2 core::int i) → self::A /* = core::int */ {
-  lowered final self::A /* = core::int */ #this = i;
+static extension-type-member method A|constructor#(@#C2 core::int i) → self::A% /* erasure=core::int, declared=! */ {
+  lowered final self::A% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method A|constructor#_#new#tearOff(core::int i) → self::A /* = core::int */
+static extension-type-member method A|constructor#_#new#tearOff(core::int i) → self::A% /* erasure=core::int, declared=! */
   return self::A|constructor#(i);
 @#C2
-static extension-type-member method A|constructor#constructor(core::int i) → self::A /* = core::int */ {
-  lowered final self::A /* = core::int */ #this = i;
+static extension-type-member method A|constructor#constructor(core::int i) → self::A% /* erasure=core::int, declared=! */ {
+  lowered final self::A% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method A|constructor#_#constructor#tearOff(core::int i) → self::A /* = core::int */
+static extension-type-member method A|constructor#_#constructor#tearOff(core::int i) → self::A% /* erasure=core::int, declared=! */
   return self::A|constructor#constructor(i);
 @#C2
-static extension-type-member method A|m(lowered final self::A /* = core::int */ #this) → void {}
-static extension-type-member method A|get#m(lowered final self::A /* = core::int */ #this) → () → void
+static extension-type-member method A|m(lowered final self::A% /* erasure=core::int, declared=! */ #this) → void {}
+static extension-type-member method A|get#m(lowered final self::A% /* erasure=core::int, declared=! */ #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {

pkg/front_end/testcases/extension_types/annotations.dart.weak.modular.expect

@@ -12,22 +12,22 @@ extension type A(core::int i) {
   constructor constructor = self::A|constructor#constructor;
   constructor tearoff constructor = self::A|constructor#_#constructor#tearOff;
 }
-static extension-type-member method A|constructor#(@#C2 core::int i) → self::A /* = core::int */ {
-  lowered final self::A /* = core::int */ #this = i;
+static extension-type-member method A|constructor#(@#C2 core::int i) → self::A% /* erasure=core::int, declared=! */ {
+  lowered final self::A% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method A|constructor#_#new#tearOff(core::int i) → self::A /* = core::int */
+static extension-type-member method A|constructor#_#new#tearOff(core::int i) → self::A% /* erasure=core::int, declared=! */
   return self::A|constructor#(i);
 @#C2
-static extension-type-member method A|constructor#constructor(core::int i) → self::A /* = core::int */ {
-  lowered final self::A /* = core::int */ #this = i;
+static extension-type-member method A|constructor#constructor(core::int i) → self::A% /* erasure=core::int, declared=! */ {
+  lowered final self::A% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method A|constructor#_#constructor#tearOff(core::int i) → self::A /* = core::int */
+static extension-type-member method A|constructor#_#constructor#tearOff(core::int i) → self::A% /* erasure=core::int, declared=! */
   return self::A|constructor#constructor(i);
 @#C2
-static extension-type-member method A|m(lowered final self::A /* = core::int */ #this) → void {}
-static extension-type-member method A|get#m(lowered final self::A /* = core::int */ #this) → () → void
+static extension-type-member method A|m(lowered final self::A% /* erasure=core::int, declared=! */ #this) → void {}
+static extension-type-member method A|get#m(lowered final self::A% /* erasure=core::int, declared=! */ #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {

pkg/front_end/testcases/extension_types/annotations.dart.weak.outline.expect

@@ -12,19 +12,19 @@ extension type A(core::int i) {
   constructor constructor = self::A|constructor#constructor;
   constructor tearoff constructor = self::A|constructor#_#constructor#tearOff;
 }
-static extension-type-member method A|constructor#(core::int i) → self::A /* = core::int */
+static extension-type-member method A|constructor#(core::int i) → self::A% /* erasure=core::int, declared=! */
   ;
-static extension-type-member method A|constructor#_#new#tearOff(core::int i) → self::A /* = core::int */
+static extension-type-member method A|constructor#_#new#tearOff(core::int i) → self::A% /* erasure=core::int, declared=! */
   return self::A|constructor#(i);
 @core::Deprecated::•("")
-static extension-type-member method A|constructor#constructor(core::int i) → self::A /* = core::int */
+static extension-type-member method A|constructor#constructor(core::int i) → self::A% /* erasure=core::int, declared=! */
   ;
-static extension-type-member method A|constructor#_#constructor#tearOff(core::int i) → self::A /* = core::int */
+static extension-type-member method A|constructor#_#constructor#tearOff(core::int i) → self::A% /* erasure=core::int, declared=! */
   return self::A|constructor#constructor(i);
 @core::Deprecated::•("")
-static extension-type-member method A|m(lowered final self::A /* = core::int */ #this) → void
+static extension-type-member method A|m(lowered final self::A% /* erasure=core::int, declared=! */ #this) → void
   ;
-static extension-type-member method A|get#m(lowered final self::A /* = core::int */ #this) → () → void
+static extension-type-member method A|get#m(lowered final self::A% /* erasure=core::int, declared=! */ #this) → () → void
   return () → void => self::A|m(#this);
 
 

pkg/front_end/testcases/extension_types/annotations.dart.weak.transformed.expect

@@ -12,22 +12,22 @@ extension type A(core::int i) {
   constructor constructor = self::A|constructor#constructor;
   constructor tearoff constructor = self::A|constructor#_#constructor#tearOff;
 }
-static extension-type-member method A|constructor#(@#C2 core::int i) → self::A /* = core::int */ {
-  lowered final self::A /* = core::int */ #this = i;
+static extension-type-member method A|constructor#(@#C2 core::int i) → self::A% /* erasure=core::int, declared=! */ {
+  lowered final self::A% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method A|constructor#_#new#tearOff(core::int i) → self::A /* = core::int */
+static extension-type-member method A|constructor#_#new#tearOff(core::int i) → self::A% /* erasure=core::int, declared=! */
   return self::A|constructor#(i);
 @#C2
-static extension-type-member method A|constructor#constructor(core::int i) → self::A /* = core::int */ {
-  lowered final self::A /* = core::int */ #this = i;
+static extension-type-member method A|constructor#constructor(core::int i) → self::A% /* erasure=core::int, declared=! */ {
+  lowered final self::A% /* erasure=core::int, declared=! */ #this = i;
   return #this;
 }
-static extension-type-member method A|constructor#_#constructor#tearOff(core::int i) → self::A /* = core::int */
+static extension-type-member method A|constructor#_#constructor#tearOff(core::int i) → self::A% /* erasure=core::int, declared=! */
   return self::A|constructor#constructor(i);
 @#C2
-static extension-type-member method A|m(lowered final self::A /* = core::int */ #this) → void {}
-static extension-type-member method A|get#m(lowered final self::A /* = core::int */ #this) → () → void
+static extension-type-member method A|m(lowered final self::A% /* erasure=core::int, declared=! */ #this) → void {}
+static extension-type-member method A|get#m(lowered final self::A% /* erasure=core::int, declared=! */ #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {

pkg/front_end/testcases/extension_types/assign_interface_type.dart.strong.expect

@@ -324,7 +324,7 @@ extension type E(self::B it) implements self::A {
   constructor • = self::E|constructor#;
   constructor tearoff • = self::E|constructor#_#new#tearOff;
 }
-extension type F(self::B it) implements self::E /* = self::B */, self::B {
+extension type F(self::B it) implements self::E /* erasure=self::B */, self::B {
   abstract extension-type-member representation-field get it() → self::B;
   constructor • = self::F|constructor#;
   constructor tearoff • = self::F|constructor#_#new#tearOff;
@@ -339,49 +339,49 @@ extension type G2<T extends core::Object>(T o) implements core::Object {
   constructor • = self::G2|constructor#;
   constructor tearoff • = self::G2|constructor#_#new#tearOff;
 }
-static extension-type-member method C|constructor#(core::Object? o) → self::C /* = core::Object? */ {
-  lowered final self::C /* = core::Object? */ #this = o;
+static extension-type-member method C|constructor#(core::Object? o) → self::C% /* erasure=core::Object?, declared=! */ {
+  lowered final self::C% /* erasure=core::Object?, declared=! */ #this = o;
   return #this;
 }
-static extension-type-member method C|constructor#_#new#tearOff(core::Object? o) → self::C /* = core::Object? */
+static extension-type-member method C|constructor#_#new#tearOff(core::Object? o) → self::C% /* erasure=core::Object?, declared=! */
   return self::C|constructor#(o);
-static extension-type-member method D|constructor#(core::Object o) → self::D /* = core::Object */ {
-  lowered final self::D /* = core::Object */ #this = o;
+static extension-type-member method D|constructor#(core::Object o) → self::D /* erasure=core::Object */ {
+  lowered final self::D /* erasure=core::Object */ #this = o;
   return #this;
 }
-static extension-type-member method D|constructor#_#new#tearOff(core::Object o) → self::D /* = core::Object */
+static extension-type-member method D|constructor#_#new#tearOff(core::Object o) → self::D /* erasure=core::Object */
   return self::D|constructor#(o);
-static extension-type-member method D2|constructor#(core::Object o) → self::D2 /* = core::Object */ {
-  lowered final self::D2 /* = core::Object */ #this = o;
+static extension-type-member method D2|constructor#(core::Object o) → self::D2% /* erasure=core::Object, declared=! */ {
+  lowered final self::D2% /* erasure=core::Object, declared=! */ #this = o;
   return #this;
 }
-static extension-type-member method D2|constructor#_#new#tearOff(core::Object o) → self::D2 /* = core::Object */
+static extension-type-member method D2|constructor#_#new#tearOff(core::Object o) → self::D2% /* erasure=core::Object, declared=! */
   return self::D2|constructor#(o);
-static extension-type-member method E|constructor#(self::B it) → self::E /* = self::B */ {
-  lowered final self::E /* = self::B */ #this = it;
+static extension-type-member method E|constructor#(self::B it) → self::E /* erasure=self::B */ {
+  lowered final self::E /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* = self::B */
+static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* erasure=self::B */
   return self::E|constructor#(it);
-static extension-type-member method F|constructor#(self::B it) → self::F /* = self::B */ {
-  lowered final self::F /* = self::B */ #this = it;
+static extension-type-member method F|constructor#(self::B it) → self::F /* erasure=self::B */ {
+  lowered final self::F /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* = self::B */
+static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* erasure=self::B */
   return self::F|constructor#(it);
-static extension-type-member method G|constructor#<T extends core::Object? = dynamic>(self::G|constructor#::T% o) → self::G<self::G|constructor#::T%> /* = self::G|constructor#::T% */ {
-  lowered final self::G<self::G|constructor#::T%> /* = self::G|constructor#::T% */ #this = o;
+static extension-type-member method G|constructor#<T extends core::Object? = dynamic>(self::G|constructor#::T% o) → self::G<self::G|constructor#::T%>% /* erasure=self::G|constructor#::T%, declared=! */ {
+  lowered final self::G<self::G|constructor#::T%>% /* erasure=self::G|constructor#::T%, declared=! */ #this = o;
   return #this;
 }
-static extension-type-member method G|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::G|constructor#_#new#tearOff::T% o) → self::G<self::G|constructor#_#new#tearOff::T%> /* = self::G|constructor#_#new#tearOff::T% */
+static extension-type-member method G|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::G|constructor#_#new#tearOff::T% o) → self::G<self::G|constructor#_#new#tearOff::T%>% /* erasure=self::G|constructor#_#new#tearOff::T%, declared=! */
   return self::G|constructor#<self::G|constructor#_#new#tearOff::T%>(o);
-static extension-type-member method G2|constructor#<T extends core::Object>(self::G2|constructor#::T o) → self::G2<self::G2|constructor#::T> /* = self::G2|constructor#::T */ {
-  lowered final self::G2<self::G2|constructor#::T> /* = self::G2|constructor#::T */ #this = o;
+static extension-type-member method G2|constructor#<T extends core::Object>(self::G2|constructor#::T o) → self::G2<self::G2|constructor#::T> /* erasure=self::G2|constructor#::T */ {
+  lowered final self::G2<self::G2|constructor#::T> /* erasure=self::G2|constructor#::T */ #this = o;
   return #this;
 }
-static extension-type-member method G2|constructor#_#new#tearOff<T extends core::Object>(self::G2|constructor#_#new#tearOff::T o) → self::G2<self::G2|constructor#_#new#tearOff::T> /* = self::G2|constructor#_#new#tearOff::T */
+static extension-type-member method G2|constructor#_#new#tearOff<T extends core::Object>(self::G2|constructor#_#new#tearOff::T o) → self::G2<self::G2|constructor#_#new#tearOff::T> /* erasure=self::G2|constructor#_#new#tearOff::T */
   return self::G2|constructor#<self::G2|constructor#_#new#tearOff::T>(o);
-static method test<T1 extends core::Object? = dynamic, T2 extends self::A, T3 extends core::Object>(core::Object o, self::A a, self::B b, self::C /* = core::Object? */ c, self::D /* = core::Object */ d, self::D2 /* = core::Object */ d2, self::E /* = self::B */ e, self::F /* = self::B */ f, self::G<self::test::T1%> /* = self::test::T1% */ g1, self::G<self::test::T2> /* = self::test::T2 */ g2, self::G2<self::test::T3> /* = self::test::T3 */ g3) → dynamic {
+static method test<T1 extends core::Object? = dynamic, T2 extends self::A, T3 extends core::Object>(core::Object o, self::A a, self::B b, self::C% /* erasure=core::Object?, declared=! */ c, self::D /* erasure=core::Object */ d, self::D2% /* erasure=core::Object, declared=! */ d2, self::E /* erasure=self::B */ e, self::F /* erasure=self::B */ f, self::G<self::test::T1%>% /* erasure=self::test::T1%, declared=! */ g1, self::G<self::test::T2>% /* erasure=self::test::T2, declared=! */ g2, self::G2<self::test::T3> /* erasure=self::test::T3 */ g3) → dynamic {
   o = o;
   o = a;
   o = b;
@@ -465,113 +465,113 @@ static method test<T1 extends core::Object? = dynamic, T2 extends self::A, T3 ex
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:68:7: Error: A value of type 'Object' can't be assigned to a variable of type 'C'.
  - 'Object' is from 'dart:core'.
   c = o; // Error
-      ^" in o as{TypeError} self::C /* = core::Object? */;
+      ^" in o as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:69:7: Error: A value of type 'A' can't be assigned to a variable of type 'C'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   c = a; // Error
-      ^" in a as{TypeError} self::C /* = core::Object? */;
+      ^" in a as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:70:7: Error: A value of type 'B' can't be assigned to a variable of type 'C'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   c = b; // Error
-      ^" in b as{TypeError} self::C /* = core::Object? */;
+      ^" in b as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = c;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:72:7: Error: A value of type 'D' can't be assigned to a variable of type 'C'.
   c = d; // Error
-      ^" in d as{TypeError} self::C /* = core::Object? */;
+      ^" in d as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:73:7: Error: A value of type 'E' can't be assigned to a variable of type 'C'.
   c = e; // Error
-      ^" in e as{TypeError} self::C /* = core::Object? */;
+      ^" in e as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:74:7: Error: A value of type 'F' can't be assigned to a variable of type 'C'.
   c = f; // Error
-      ^" in f as{TypeError} self::C /* = core::Object? */;
+      ^" in f as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:75:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'C'.
   c = g1; // Error
-      ^" in g1 as{TypeError} self::C /* = core::Object? */;
+      ^" in g1 as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:76:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'C'.
   c = g2; // Error
-      ^" in g2 as{TypeError} self::C /* = core::Object? */;
+      ^" in g2 as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:78:7: Error: A value of type 'Object' can't be assigned to a variable of type 'D'.
  - 'Object' is from 'dart:core'.
   d = o; // Error
-      ^" in o as{TypeError} self::D /* = core::Object */;
+      ^" in o as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:79:7: Error: A value of type 'A' can't be assigned to a variable of type 'D'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   d = a; // Error
-      ^" in a as{TypeError} self::D /* = core::Object */;
+      ^" in a as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:80:7: Error: A value of type 'B' can't be assigned to a variable of type 'D'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   d = b; // Error
-      ^" in b as{TypeError} self::D /* = core::Object */;
+      ^" in b as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:81:7: Error: A value of type 'C' can't be assigned to a variable of type 'D'.
   d = c; // Error
-      ^" in c as{TypeError} self::D /* = core::Object */;
+      ^" in c as{TypeError} self::D /* erasure=core::Object */;
   d = d;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:83:7: Error: A value of type 'E' can't be assigned to a variable of type 'D'.
   d = e; // Error
-      ^" in e as{TypeError} self::D /* = core::Object */;
+      ^" in e as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:84:7: Error: A value of type 'F' can't be assigned to a variable of type 'D'.
   d = f; // Error
-      ^" in f as{TypeError} self::D /* = core::Object */;
+      ^" in f as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:85:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'D'.
   d = g1; // Error
-      ^" in g1 as{TypeError} self::D /* = core::Object */;
+      ^" in g1 as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:86:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'D'.
   d = g2; // Error
-      ^" in g2 as{TypeError} self::D /* = core::Object */;
+      ^" in g2 as{TypeError} self::D /* erasure=core::Object */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:88:7: Error: A value of type 'Object' can't be assigned to a variable of type 'E'.
  - 'Object' is from 'dart:core'.
   e = o; // Error
-      ^" in o as{TypeError} self::E /* = self::B */;
+      ^" in o as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:89:7: Error: A value of type 'A' can't be assigned to a variable of type 'E'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   e = a; // Error
-      ^" in a as{TypeError} self::E /* = self::B */;
+      ^" in a as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:90:7: Error: A value of type 'B' can't be assigned to a variable of type 'E'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   e = b; // Error
-      ^" in b as{TypeError} self::E /* = self::B */;
+      ^" in b as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:91:7: Error: A value of type 'C' can't be assigned to a variable of type 'E'.
   e = c; // Error
-      ^" in c as{TypeError} self::E /* = self::B */;
+      ^" in c as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:92:7: Error: A value of type 'D' can't be assigned to a variable of type 'E'.
   e = d; // Error
-      ^" in d as{TypeError} self::E /* = self::B */;
+      ^" in d as{TypeError} self::E /* erasure=self::B */;
   e = e;
   e = f;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:95:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'E'.
   e = g1; // Error
-      ^" in g1 as{TypeError} self::E /* = self::B */;
+      ^" in g1 as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:96:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'E'.
   e = g2; // Error
-      ^" in g2 as{TypeError} self::E /* = self::B */;
+      ^" in g2 as{TypeError} self::E /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:98:7: Error: A value of type 'Object' can't be assigned to a variable of type 'F'.
  - 'Object' is from 'dart:core'.
   f = o; // Error
-      ^" in o as{TypeError} self::F /* = self::B */;
+      ^" in o as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:99:7: Error: A value of type 'A' can't be assigned to a variable of type 'F'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   f = a; // Error
-      ^" in a as{TypeError} self::F /* = self::B */;
+      ^" in a as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:100:7: Error: A value of type 'B' can't be assigned to a variable of type 'F'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   f = b; // Error
-      ^" in b as{TypeError} self::F /* = self::B */;
+      ^" in b as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:101:7: Error: A value of type 'C' can't be assigned to a variable of type 'F'.
   f = c; // Error
-      ^" in c as{TypeError} self::F /* = self::B */;
+      ^" in c as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:102:7: Error: A value of type 'D' can't be assigned to a variable of type 'F'.
   f = d; // Error
-      ^" in d as{TypeError} self::F /* = self::B */;
+      ^" in d as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:103:7: Error: A value of type 'E' can't be assigned to a variable of type 'F'.
   f = e; // Error
-      ^" in e as{TypeError} self::F /* = self::B */;
+      ^" in e as{TypeError} self::F /* erasure=self::B */;
   f = f;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:105:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'F'.
   f = g1; // Error
-      ^" in g1 as{TypeError} self::F /* = self::B */;
+      ^" in g1 as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:106:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'F'.
   f = g2; // Error
-      ^" in g2 as{TypeError} self::F /* = self::B */;
+      ^" in g2 as{TypeError} self::F /* erasure=self::B */;
   g1 = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:108:8: Error: A value of type 'Object' can't be assigned to a variable of type 'G<T1>'.
  - 'Object' is from 'dart:core'.
   g1 = o; // Error

pkg/front_end/testcases/extension_types/assign_interface_type.dart.strong.transformed.expect

@@ -324,7 +324,7 @@ extension type E(self::B it) implements self::A {
   constructor • = self::E|constructor#;
   constructor tearoff • = self::E|constructor#_#new#tearOff;
 }
-extension type F(self::B it) implements self::E /* = self::B */, self::B {
+extension type F(self::B it) implements self::E /* erasure=self::B */, self::B {
   abstract extension-type-member representation-field get it() → self::B;
   constructor • = self::F|constructor#;
   constructor tearoff • = self::F|constructor#_#new#tearOff;
@@ -339,71 +339,71 @@ extension type G2<T extends core::Object>(T o) implements core::Object {
   constructor • = self::G2|constructor#;
   constructor tearoff • = self::G2|constructor#_#new#tearOff;
 }
-static extension-type-member method C|constructor#(core::Object? o) → self::C /* = core::Object? */ {
-  lowered final self::C /* = core::Object? */ #this = o;
+static extension-type-member method C|constructor#(core::Object? o) → self::C% /* erasure=core::Object?, declared=! */ {
+  lowered final self::C% /* erasure=core::Object?, declared=! */ #this = o;
   return #this;
 }
-static extension-type-member method C|constructor#_#new#tearOff(core::Object? o) → self::C /* = core::Object? */
+static extension-type-member method C|constructor#_#new#tearOff(core::Object? o) → self::C% /* erasure=core::Object?, declared=! */
   return self::C|constructor#(o);
-static extension-type-member method D|constructor#(core::Object o) → self::D /* = core::Object */ {
-  lowered final self::D /* = core::Object */ #this = o;
+static extension-type-member method D|constructor#(core::Object o) → self::D /* erasure=core::Object */ {
+  lowered final self::D /* erasure=core::Object */ #this = o;
   return #this;
 }
-static extension-type-member method D|constructor#_#new#tearOff(core::Object o) → self::D /* = core::Object */
+static extension-type-member method D|constructor#_#new#tearOff(core::Object o) → self::D /* erasure=core::Object */
   return self::D|constructor#(o);
-static extension-type-member method D2|constructor#(core::Object o) → self::D2 /* = core::Object */ {
-  lowered final self::D2 /* = core::Object */ #this = o;
+static extension-type-member method D2|constructor#(core::Object o) → self::D2% /* erasure=core::Object, declared=! */ {
+  lowered final self::D2% /* erasure=core::Object, declared=! */ #this = o;
   return #this;
 }
-static extension-type-member method D2|constructor#_#new#tearOff(core::Object o) → self::D2 /* = core::Object */
+static extension-type-member method D2|constructor#_#new#tearOff(core::Object o) → self::D2% /* erasure=core::Object, declared=! */
   return self::D2|constructor#(o);
-static extension-type-member method E|constructor#(self::B it) → self::E /* = self::B */ {
-  lowered final self::E /* = self::B */ #this = it;
+static extension-type-member method E|constructor#(self::B it) → self::E /* erasure=self::B */ {
+  lowered final self::E /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* = self::B */
+static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* erasure=self::B */
   return self::E|constructor#(it);
-static extension-type-member method F|constructor#(self::B it) → self::F /* = self::B */ {
-  lowered final self::F /* = self::B */ #this = it;
+static extension-type-member method F|constructor#(self::B it) → self::F /* erasure=self::B */ {
+  lowered final self::F /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* = self::B */
+static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* erasure=self::B */
   return self::F|constructor#(it);
-static extension-type-member method G|constructor#<T extends core::Object? = dynamic>(self::G|constructor#::T% o) → self::G<self::G|constructor#::T%> /* = self::G|constructor#::T% */ {
-  lowered final self::G<self::G|constructor#::T%> /* = self::G|constructor#::T% */ #this = o;
+static extension-type-member method G|constructor#<T extends core::Object? = dynamic>(self::G|constructor#::T% o) → self::G<self::G|constructor#::T%>% /* erasure=self::G|constructor#::T%, declared=! */ {
+  lowered final self::G<self::G|constructor#::T%>% /* erasure=self::G|constructor#::T%, declared=! */ #this = o;
   return #this;
 }
-static extension-type-member method G|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::G|constructor#_#new#tearOff::T% o) → self::G<self::G|constructor#_#new#tearOff::T%> /* = self::G|constructor#_#new#tearOff::T% */
+static extension-type-member method G|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::G|constructor#_#new#tearOff::T% o) → self::G<self::G|constructor#_#new#tearOff::T%>% /* erasure=self::G|constructor#_#new#tearOff::T%, declared=! */
   return self::G|constructor#<self::G|constructor#_#new#tearOff::T%>(o);
-static extension-type-member method G2|constructor#<T extends core::Object>(self::G2|constructor#::T o) → self::G2<self::G2|constructor#::T> /* = self::G2|constructor#::T */ {
-  lowered final self::G2<self::G2|constructor#::T> /* = self::G2|constructor#::T */ #this = o;
+static extension-type-member method G2|constructor#<T extends core::Object>(self::G2|constructor#::T o) → self::G2<self::G2|constructor#::T> /* erasure=self::G2|constructor#::T */ {
+  lowered final self::G2<self::G2|constructor#::T> /* erasure=self::G2|constructor#::T */ #this = o;
   return #this;
 }
-static extension-type-member method G2|constructor#_#new#tearOff<T extends core::Object>(self::G2|constructor#_#new#tearOff::T o) → self::G2<self::G2|constructor#_#new#tearOff::T> /* = self::G2|constructor#_#new#tearOff::T */
+static extension-type-member method G2|constructor#_#new#tearOff<T extends core::Object>(self::G2|constructor#_#new#tearOff::T o) → self::G2<self::G2|constructor#_#new#tearOff::T> /* erasure=self::G2|constructor#_#new#tearOff::T */
   return self::G2|constructor#<self::G2|constructor#_#new#tearOff::T>(o);
-static method test<T1 extends core::Object? = dynamic, T2 extends self::A, T3 extends core::Object>(core::Object o, self::A a, self::B b, self::C /* = core::Object? */ c, self::D /* = core::Object */ d, self::D2 /* = core::Object */ d2, self::E /* = self::B */ e, self::F /* = self::B */ f, self::G<self::test::T1%> /* = self::test::T1% */ g1, self::G<self::test::T2> /* = self::test::T2 */ g2, self::G2<self::test::T3> /* = self::test::T3 */ g3) → dynamic {
+static method test<T1 extends core::Object? = dynamic, T2 extends self::A, T3 extends core::Object>(core::Object o, self::A a, self::B b, self::C% /* erasure=core::Object?, declared=! */ c, self::D /* erasure=core::Object */ d, self::D2% /* erasure=core::Object, declared=! */ d2, self::E /* erasure=self::B */ e, self::F /* erasure=self::B */ f, self::G<self::test::T1%>% /* erasure=self::test::T1%, declared=! */ g1, self::G<self::test::T2>% /* erasure=self::test::T2, declared=! */ g2, self::G2<self::test::T3> /* erasure=self::test::T3 */ g3) → dynamic {
   o = o;
   o = a;
   o = b;
   o = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:39:7: Error: A value of type 'C' can't be assigned to a variable of type 'Object' because 'C' is nullable and 'Object' isn't.
  - 'Object' is from 'dart:core'.
   o = c; // Error
-      ^" in let self::C /* = core::Object? */ #t1 = c in #t1 == null ?{core::Object} #t1 as{TypeError} core::Object : #t1{core::Object};
+      ^" in let self::C% /* erasure=core::Object?, declared=! */ #t1 = c in #t1 == null ?{core::Object} #t1 as{TypeError} core::Object : #t1{core::Object};
   o = d;
   o = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:41:7: Error: A value of type 'D2' can't be assigned to a variable of type 'Object' because 'D2' is nullable and 'Object' isn't.
  - 'Object' is from 'dart:core'.
   o = d2; // Error
-      ^" in let self::D2 /* = core::Object */ #t2 = d2 in #t2 == null ?{core::Object} #t2 as{TypeError} core::Object : #t2{core::Object};
+      ^" in let self::D2% /* erasure=core::Object, declared=! */ #t2 = d2 in #t2 == null ?{core::Object} #t2 as{TypeError} core::Object : #t2{core::Object};
   o = e;
   o = f;
   o = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:44:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'Object' because 'G<T1>' is nullable and 'Object' isn't.
  - 'Object' is from 'dart:core'.
   o = g1; // Error
-      ^" in let self::G<self::test::T1%> /* = self::test::T1% */ #t3 = g1 in #t3 == null ?{core::Object} #t3 as{TypeError} core::Object : #t3{core::Object};
+      ^" in let self::G<self::test::T1%>% /* erasure=self::test::T1%, declared=! */ #t3 = g1 in #t3 == null ?{core::Object} #t3 as{TypeError} core::Object : #t3{core::Object};
   o = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:45:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'Object' because 'G<T2>' is nullable and 'Object' isn't.
  - 'Object' is from 'dart:core'.
   o = g2; // Error
-      ^" in let self::G<self::test::T2> /* = self::test::T2 */ #t4 = g2 in #t4 == null ?{core::Object} #t4 as{TypeError} core::Object : #t4{core::Object};
+      ^" in let self::G<self::test::T2>% /* erasure=self::test::T2, declared=! */ #t4 = g2 in #t4 == null ?{core::Object} #t4 as{TypeError} core::Object : #t4{core::Object};
   o = g3;
   a = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:48:7: Error: A value of type 'Object' can't be assigned to a variable of type 'A'.
  - 'Object' is from 'dart:core'.
@@ -465,113 +465,113 @@ static method test<T1 extends core::Object? = dynamic, T2 extends self::A, T3 ex
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:68:7: Error: A value of type 'Object' can't be assigned to a variable of type 'C'.
  - 'Object' is from 'dart:core'.
   c = o; // Error
-      ^" in o as{TypeError} self::C /* = core::Object? */;
+      ^" in o as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:69:7: Error: A value of type 'A' can't be assigned to a variable of type 'C'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   c = a; // Error
-      ^" in a as{TypeError} self::C /* = core::Object? */;
+      ^" in a as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:70:7: Error: A value of type 'B' can't be assigned to a variable of type 'C'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   c = b; // Error
-      ^" in b as{TypeError} self::C /* = core::Object? */;
+      ^" in b as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = c;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:72:7: Error: A value of type 'D' can't be assigned to a variable of type 'C'.
   c = d; // Error
-      ^" in d as{TypeError} self::C /* = core::Object? */;
+      ^" in d as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:73:7: Error: A value of type 'E' can't be assigned to a variable of type 'C'.
   c = e; // Error
-      ^" in e as{TypeError} self::C /* = core::Object? */;
+      ^" in e as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:74:7: Error: A value of type 'F' can't be assigned to a variable of type 'C'.
   c = f; // Error
-      ^" in f as{TypeError} self::C /* = core::Object? */;
+      ^" in f as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:75:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'C'.
   c = g1; // Error
-      ^" in g1 as{TypeError} self::C /* = core::Object? */;
+      ^" in g1 as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:76:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'C'.
   c = g2; // Error
-      ^" in g2 as{TypeError} self::C /* = core::Object? */;
+      ^" in g2 as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:78:7: Error: A value of type 'Object' can't be assigned to a variable of type 'D'.
  - 'Object' is from 'dart:core'.
   d = o; // Error
-      ^" in o as{TypeError} self::D /* = core::Object */;
+      ^" in o as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:79:7: Error: A value of type 'A' can't be assigned to a variable of type 'D'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   d = a; // Error
-      ^" in a as{TypeError} self::D /* = core::Object */;
+      ^" in a as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:80:7: Error: A value of type 'B' can't be assigned to a variable of type 'D'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   d = b; // Error
-      ^" in b as{TypeError} self::D /* = core::Object */;
+      ^" in b as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:81:7: Error: A value of type 'C' can't be assigned to a variable of type 'D'.
   d = c; // Error
-      ^" in c as{TypeError} self::D /* = core::Object */;
+      ^" in c as{TypeError} self::D /* erasure=core::Object */;
   d = d;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:83:7: Error: A value of type 'E' can't be assigned to a variable of type 'D'.
   d = e; // Error
-      ^" in e as{TypeError} self::D /* = core::Object */;
+      ^" in e as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:84:7: Error: A value of type 'F' can't be assigned to a variable of type 'D'.
   d = f; // Error
-      ^" in f as{TypeError} self::D /* = core::Object */;
+      ^" in f as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:85:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'D'.
   d = g1; // Error
-      ^" in g1 as{TypeError} self::D /* = core::Object */;
+      ^" in g1 as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:86:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'D'.
   d = g2; // Error
-      ^" in g2 as{TypeError} self::D /* = core::Object */;
+      ^" in g2 as{TypeError} self::D /* erasure=core::Object */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:88:7: Error: A value of type 'Object' can't be assigned to a variable of type 'E'.
  - 'Object' is from 'dart:core'.
   e = o; // Error
-      ^" in o as{TypeError} self::E /* = self::B */;
+      ^" in o as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:89:7: Error: A value of type 'A' can't be assigned to a variable of type 'E'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   e = a; // Error
-      ^" in a as{TypeError} self::E /* = self::B */;
+      ^" in a as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:90:7: Error: A value of type 'B' can't be assigned to a variable of type 'E'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   e = b; // Error
-      ^" in b as{TypeError} self::E /* = self::B */;
+      ^" in b as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:91:7: Error: A value of type 'C' can't be assigned to a variable of type 'E'.
   e = c; // Error
-      ^" in c as{TypeError} self::E /* = self::B */;
+      ^" in c as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:92:7: Error: A value of type 'D' can't be assigned to a variable of type 'E'.
   e = d; // Error
-      ^" in d as{TypeError} self::E /* = self::B */;
+      ^" in d as{TypeError} self::E /* erasure=self::B */;
   e = e;
   e = f;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:95:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'E'.
   e = g1; // Error
-      ^" in g1 as{TypeError} self::E /* = self::B */;
+      ^" in g1 as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:96:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'E'.
   e = g2; // Error
-      ^" in g2 as{TypeError} self::E /* = self::B */;
+      ^" in g2 as{TypeError} self::E /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:98:7: Error: A value of type 'Object' can't be assigned to a variable of type 'F'.
  - 'Object' is from 'dart:core'.
   f = o; // Error
-      ^" in o as{TypeError} self::F /* = self::B */;
+      ^" in o as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:99:7: Error: A value of type 'A' can't be assigned to a variable of type 'F'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   f = a; // Error
-      ^" in a as{TypeError} self::F /* = self::B */;
+      ^" in a as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:100:7: Error: A value of type 'B' can't be assigned to a variable of type 'F'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   f = b; // Error
-      ^" in b as{TypeError} self::F /* = self::B */;
+      ^" in b as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:101:7: Error: A value of type 'C' can't be assigned to a variable of type 'F'.
   f = c; // Error
-      ^" in c as{TypeError} self::F /* = self::B */;
+      ^" in c as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:102:7: Error: A value of type 'D' can't be assigned to a variable of type 'F'.
   f = d; // Error
-      ^" in d as{TypeError} self::F /* = self::B */;
+      ^" in d as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:103:7: Error: A value of type 'E' can't be assigned to a variable of type 'F'.
   f = e; // Error
-      ^" in e as{TypeError} self::F /* = self::B */;
+      ^" in e as{TypeError} self::F /* erasure=self::B */;
   f = f;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:105:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'F'.
   f = g1; // Error
-      ^" in g1 as{TypeError} self::F /* = self::B */;
+      ^" in g1 as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:106:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'F'.
   f = g2; // Error
-      ^" in g2 as{TypeError} self::F /* = self::B */;
+      ^" in g2 as{TypeError} self::F /* erasure=self::B */;
   g1 = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:108:8: Error: A value of type 'Object' can't be assigned to a variable of type 'G<T1>'.
  - 'Object' is from 'dart:core'.
   g1 = o; // Error

pkg/front_end/testcases/extension_types/assign_interface_type.dart.weak.expect

@@ -324,7 +324,7 @@ extension type E(self::B it) implements self::A {
   constructor • = self::E|constructor#;
   constructor tearoff • = self::E|constructor#_#new#tearOff;
 }
-extension type F(self::B it) implements self::E /* = self::B */, self::B {
+extension type F(self::B it) implements self::E /* erasure=self::B */, self::B {
   abstract extension-type-member representation-field get it() → self::B;
   constructor • = self::F|constructor#;
   constructor tearoff • = self::F|constructor#_#new#tearOff;
@@ -339,49 +339,49 @@ extension type G2<T extends core::Object>(T o) implements core::Object {
   constructor • = self::G2|constructor#;
   constructor tearoff • = self::G2|constructor#_#new#tearOff;
 }
-static extension-type-member method C|constructor#(core::Object? o) → self::C /* = core::Object? */ {
-  lowered final self::C /* = core::Object? */ #this = o;
+static extension-type-member method C|constructor#(core::Object? o) → self::C% /* erasure=core::Object?, declared=! */ {
+  lowered final self::C% /* erasure=core::Object?, declared=! */ #this = o;
   return #this;
 }
-static extension-type-member method C|constructor#_#new#tearOff(core::Object? o) → self::C /* = core::Object? */
+static extension-type-member method C|constructor#_#new#tearOff(core::Object? o) → self::C% /* erasure=core::Object?, declared=! */
   return self::C|constructor#(o);
-static extension-type-member method D|constructor#(core::Object o) → self::D /* = core::Object */ {
-  lowered final self::D /* = core::Object */ #this = o;
+static extension-type-member method D|constructor#(core::Object o) → self::D /* erasure=core::Object */ {
+  lowered final self::D /* erasure=core::Object */ #this = o;
   return #this;
 }
-static extension-type-member method D|constructor#_#new#tearOff(core::Object o) → self::D /* = core::Object */
+static extension-type-member method D|constructor#_#new#tearOff(core::Object o) → self::D /* erasure=core::Object */
   return self::D|constructor#(o);
-static extension-type-member method D2|constructor#(core::Object o) → self::D2 /* = core::Object */ {
-  lowered final self::D2 /* = core::Object */ #this = o;
+static extension-type-member method D2|constructor#(core::Object o) → self::D2% /* erasure=core::Object, declared=! */ {
+  lowered final self::D2% /* erasure=core::Object, declared=! */ #this = o;
   return #this;
 }
-static extension-type-member method D2|constructor#_#new#tearOff(core::Object o) → self::D2 /* = core::Object */
+static extension-type-member method D2|constructor#_#new#tearOff(core::Object o) → self::D2% /* erasure=core::Object, declared=! */
   return self::D2|constructor#(o);
-static extension-type-member method E|constructor#(self::B it) → self::E /* = self::B */ {
-  lowered final self::E /* = self::B */ #this = it;
+static extension-type-member method E|constructor#(self::B it) → self::E /* erasure=self::B */ {
+  lowered final self::E /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* = self::B */
+static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* erasure=self::B */
   return self::E|constructor#(it);
-static extension-type-member method F|constructor#(self::B it) → self::F /* = self::B */ {
-  lowered final self::F /* = self::B */ #this = it;
+static extension-type-member method F|constructor#(self::B it) → self::F /* erasure=self::B */ {
+  lowered final self::F /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* = self::B */
+static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* erasure=self::B */
   return self::F|constructor#(it);
-static extension-type-member method G|constructor#<T extends core::Object? = dynamic>(self::G|constructor#::T% o) → self::G<self::G|constructor#::T%> /* = self::G|constructor#::T% */ {
-  lowered final self::G<self::G|constructor#::T%> /* = self::G|constructor#::T% */ #this = o;
+static extension-type-member method G|constructor#<T extends core::Object? = dynamic>(self::G|constructor#::T% o) → self::G<self::G|constructor#::T%>% /* erasure=self::G|constructor#::T%, declared=! */ {
+  lowered final self::G<self::G|constructor#::T%>% /* erasure=self::G|constructor#::T%, declared=! */ #this = o;
   return #this;
 }
-static extension-type-member method G|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::G|constructor#_#new#tearOff::T% o) → self::G<self::G|constructor#_#new#tearOff::T%> /* = self::G|constructor#_#new#tearOff::T% */
+static extension-type-member method G|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::G|constructor#_#new#tearOff::T% o) → self::G<self::G|constructor#_#new#tearOff::T%>% /* erasure=self::G|constructor#_#new#tearOff::T%, declared=! */
   return self::G|constructor#<self::G|constructor#_#new#tearOff::T%>(o);
-static extension-type-member method G2|constructor#<T extends core::Object>(self::G2|constructor#::T o) → self::G2<self::G2|constructor#::T> /* = self::G2|constructor#::T */ {
-  lowered final self::G2<self::G2|constructor#::T> /* = self::G2|constructor#::T */ #this = o;
+static extension-type-member method G2|constructor#<T extends core::Object>(self::G2|constructor#::T o) → self::G2<self::G2|constructor#::T> /* erasure=self::G2|constructor#::T */ {
+  lowered final self::G2<self::G2|constructor#::T> /* erasure=self::G2|constructor#::T */ #this = o;
   return #this;
 }
-static extension-type-member method G2|constructor#_#new#tearOff<T extends core::Object>(self::G2|constructor#_#new#tearOff::T o) → self::G2<self::G2|constructor#_#new#tearOff::T> /* = self::G2|constructor#_#new#tearOff::T */
+static extension-type-member method G2|constructor#_#new#tearOff<T extends core::Object>(self::G2|constructor#_#new#tearOff::T o) → self::G2<self::G2|constructor#_#new#tearOff::T> /* erasure=self::G2|constructor#_#new#tearOff::T */
   return self::G2|constructor#<self::G2|constructor#_#new#tearOff::T>(o);
-static method test<T1 extends core::Object? = dynamic, T2 extends self::A, T3 extends core::Object>(core::Object o, self::A a, self::B b, self::C /* = core::Object? */ c, self::D /* = core::Object */ d, self::D2 /* = core::Object */ d2, self::E /* = self::B */ e, self::F /* = self::B */ f, self::G<self::test::T1%> /* = self::test::T1% */ g1, self::G<self::test::T2> /* = self::test::T2 */ g2, self::G2<self::test::T3> /* = self::test::T3 */ g3) → dynamic {
+static method test<T1 extends core::Object? = dynamic, T2 extends self::A, T3 extends core::Object>(core::Object o, self::A a, self::B b, self::C% /* erasure=core::Object?, declared=! */ c, self::D /* erasure=core::Object */ d, self::D2% /* erasure=core::Object, declared=! */ d2, self::E /* erasure=self::B */ e, self::F /* erasure=self::B */ f, self::G<self::test::T1%>% /* erasure=self::test::T1%, declared=! */ g1, self::G<self::test::T2>% /* erasure=self::test::T2, declared=! */ g2, self::G2<self::test::T3> /* erasure=self::test::T3 */ g3) → dynamic {
   o = o;
   o = a;
   o = b;
@@ -465,113 +465,113 @@ static method test<T1 extends core::Object? = dynamic, T2 extends self::A, T3 ex
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:68:7: Error: A value of type 'Object' can't be assigned to a variable of type 'C'.
  - 'Object' is from 'dart:core'.
   c = o; // Error
-      ^" in o as{TypeError} self::C /* = core::Object? */;
+      ^" in o as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:69:7: Error: A value of type 'A' can't be assigned to a variable of type 'C'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   c = a; // Error
-      ^" in a as{TypeError} self::C /* = core::Object? */;
+      ^" in a as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:70:7: Error: A value of type 'B' can't be assigned to a variable of type 'C'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   c = b; // Error
-      ^" in b as{TypeError} self::C /* = core::Object? */;
+      ^" in b as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = c;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:72:7: Error: A value of type 'D' can't be assigned to a variable of type 'C'.
   c = d; // Error
-      ^" in d as{TypeError} self::C /* = core::Object? */;
+      ^" in d as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:73:7: Error: A value of type 'E' can't be assigned to a variable of type 'C'.
   c = e; // Error
-      ^" in e as{TypeError} self::C /* = core::Object? */;
+      ^" in e as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:74:7: Error: A value of type 'F' can't be assigned to a variable of type 'C'.
   c = f; // Error
-      ^" in f as{TypeError} self::C /* = core::Object? */;
+      ^" in f as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:75:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'C'.
   c = g1; // Error
-      ^" in g1 as{TypeError} self::C /* = core::Object? */;
+      ^" in g1 as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:76:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'C'.
   c = g2; // Error
-      ^" in g2 as{TypeError} self::C /* = core::Object? */;
+      ^" in g2 as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:78:7: Error: A value of type 'Object' can't be assigned to a variable of type 'D'.
  - 'Object' is from 'dart:core'.
   d = o; // Error
-      ^" in o as{TypeError} self::D /* = core::Object */;
+      ^" in o as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:79:7: Error: A value of type 'A' can't be assigned to a variable of type 'D'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   d = a; // Error
-      ^" in a as{TypeError} self::D /* = core::Object */;
+      ^" in a as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:80:7: Error: A value of type 'B' can't be assigned to a variable of type 'D'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   d = b; // Error
-      ^" in b as{TypeError} self::D /* = core::Object */;
+      ^" in b as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:81:7: Error: A value of type 'C' can't be assigned to a variable of type 'D'.
   d = c; // Error
-      ^" in c as{TypeError} self::D /* = core::Object */;
+      ^" in c as{TypeError} self::D /* erasure=core::Object */;
   d = d;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:83:7: Error: A value of type 'E' can't be assigned to a variable of type 'D'.
   d = e; // Error
-      ^" in e as{TypeError} self::D /* = core::Object */;
+      ^" in e as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:84:7: Error: A value of type 'F' can't be assigned to a variable of type 'D'.
   d = f; // Error
-      ^" in f as{TypeError} self::D /* = core::Object */;
+      ^" in f as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:85:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'D'.
   d = g1; // Error
-      ^" in g1 as{TypeError} self::D /* = core::Object */;
+      ^" in g1 as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:86:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'D'.
   d = g2; // Error
-      ^" in g2 as{TypeError} self::D /* = core::Object */;
+      ^" in g2 as{TypeError} self::D /* erasure=core::Object */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:88:7: Error: A value of type 'Object' can't be assigned to a variable of type 'E'.
  - 'Object' is from 'dart:core'.
   e = o; // Error
-      ^" in o as{TypeError} self::E /* = self::B */;
+      ^" in o as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:89:7: Error: A value of type 'A' can't be assigned to a variable of type 'E'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   e = a; // Error
-      ^" in a as{TypeError} self::E /* = self::B */;
+      ^" in a as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:90:7: Error: A value of type 'B' can't be assigned to a variable of type 'E'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   e = b; // Error
-      ^" in b as{TypeError} self::E /* = self::B */;
+      ^" in b as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:91:7: Error: A value of type 'C' can't be assigned to a variable of type 'E'.
   e = c; // Error
-      ^" in c as{TypeError} self::E /* = self::B */;
+      ^" in c as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:92:7: Error: A value of type 'D' can't be assigned to a variable of type 'E'.
   e = d; // Error
-      ^" in d as{TypeError} self::E /* = self::B */;
+      ^" in d as{TypeError} self::E /* erasure=self::B */;
   e = e;
   e = f;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:95:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'E'.
   e = g1; // Error
-      ^" in g1 as{TypeError} self::E /* = self::B */;
+      ^" in g1 as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:96:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'E'.
   e = g2; // Error
-      ^" in g2 as{TypeError} self::E /* = self::B */;
+      ^" in g2 as{TypeError} self::E /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:98:7: Error: A value of type 'Object' can't be assigned to a variable of type 'F'.
  - 'Object' is from 'dart:core'.
   f = o; // Error
-      ^" in o as{TypeError} self::F /* = self::B */;
+      ^" in o as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:99:7: Error: A value of type 'A' can't be assigned to a variable of type 'F'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   f = a; // Error
-      ^" in a as{TypeError} self::F /* = self::B */;
+      ^" in a as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:100:7: Error: A value of type 'B' can't be assigned to a variable of type 'F'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   f = b; // Error
-      ^" in b as{TypeError} self::F /* = self::B */;
+      ^" in b as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:101:7: Error: A value of type 'C' can't be assigned to a variable of type 'F'.
   f = c; // Error
-      ^" in c as{TypeError} self::F /* = self::B */;
+      ^" in c as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:102:7: Error: A value of type 'D' can't be assigned to a variable of type 'F'.
   f = d; // Error
-      ^" in d as{TypeError} self::F /* = self::B */;
+      ^" in d as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:103:7: Error: A value of type 'E' can't be assigned to a variable of type 'F'.
   f = e; // Error
-      ^" in e as{TypeError} self::F /* = self::B */;
+      ^" in e as{TypeError} self::F /* erasure=self::B */;
   f = f;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:105:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'F'.
   f = g1; // Error
-      ^" in g1 as{TypeError} self::F /* = self::B */;
+      ^" in g1 as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:106:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'F'.
   f = g2; // Error
-      ^" in g2 as{TypeError} self::F /* = self::B */;
+      ^" in g2 as{TypeError} self::F /* erasure=self::B */;
   g1 = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:108:8: Error: A value of type 'Object' can't be assigned to a variable of type 'G<T1>'.
  - 'Object' is from 'dart:core'.
   g1 = o; // Error

pkg/front_end/testcases/extension_types/assign_interface_type.dart.weak.modular.expect

@@ -324,7 +324,7 @@ extension type E(self::B it) implements self::A {
   constructor • = self::E|constructor#;
   constructor tearoff • = self::E|constructor#_#new#tearOff;
 }
-extension type F(self::B it) implements self::E /* = self::B */, self::B {
+extension type F(self::B it) implements self::E /* erasure=self::B */, self::B {
   abstract extension-type-member representation-field get it() → self::B;
   constructor • = self::F|constructor#;
   constructor tearoff • = self::F|constructor#_#new#tearOff;
@@ -339,49 +339,49 @@ extension type G2<T extends core::Object>(T o) implements core::Object {
   constructor • = self::G2|constructor#;
   constructor tearoff • = self::G2|constructor#_#new#tearOff;
 }
-static extension-type-member method C|constructor#(core::Object? o) → self::C /* = core::Object? */ {
-  lowered final self::C /* = core::Object? */ #this = o;
+static extension-type-member method C|constructor#(core::Object? o) → self::C% /* erasure=core::Object?, declared=! */ {
+  lowered final self::C% /* erasure=core::Object?, declared=! */ #this = o;
   return #this;
 }
-static extension-type-member method C|constructor#_#new#tearOff(core::Object? o) → self::C /* = core::Object? */
+static extension-type-member method C|constructor#_#new#tearOff(core::Object? o) → self::C% /* erasure=core::Object?, declared=! */
   return self::C|constructor#(o);
-static extension-type-member method D|constructor#(core::Object o) → self::D /* = core::Object */ {
-  lowered final self::D /* = core::Object */ #this = o;
+static extension-type-member method D|constructor#(core::Object o) → self::D /* erasure=core::Object */ {
+  lowered final self::D /* erasure=core::Object */ #this = o;
   return #this;
 }
-static extension-type-member method D|constructor#_#new#tearOff(core::Object o) → self::D /* = core::Object */
+static extension-type-member method D|constructor#_#new#tearOff(core::Object o) → self::D /* erasure=core::Object */
   return self::D|constructor#(o);
-static extension-type-member method D2|constructor#(core::Object o) → self::D2 /* = core::Object */ {
-  lowered final self::D2 /* = core::Object */ #this = o;
+static extension-type-member method D2|constructor#(core::Object o) → self::D2% /* erasure=core::Object, declared=! */ {
+  lowered final self::D2% /* erasure=core::Object, declared=! */ #this = o;
   return #this;
 }
-static extension-type-member method D2|constructor#_#new#tearOff(core::Object o) → self::D2 /* = core::Object */
+static extension-type-member method D2|constructor#_#new#tearOff(core::Object o) → self::D2% /* erasure=core::Object, declared=! */
   return self::D2|constructor#(o);
-static extension-type-member method E|constructor#(self::B it) → self::E /* = self::B */ {
-  lowered final self::E /* = self::B */ #this = it;
+static extension-type-member method E|constructor#(self::B it) → self::E /* erasure=self::B */ {
+  lowered final self::E /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* = self::B */
+static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* erasure=self::B */
   return self::E|constructor#(it);
-static extension-type-member method F|constructor#(self::B it) → self::F /* = self::B */ {
-  lowered final self::F /* = self::B */ #this = it;
+static extension-type-member method F|constructor#(self::B it) → self::F /* erasure=self::B */ {
+  lowered final self::F /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* = self::B */
+static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* erasure=self::B */
   return self::F|constructor#(it);
-static extension-type-member method G|constructor#<T extends core::Object? = dynamic>(self::G|constructor#::T% o) → self::G<self::G|constructor#::T%> /* = self::G|constructor#::T% */ {
-  lowered final self::G<self::G|constructor#::T%> /* = self::G|constructor#::T% */ #this = o;
+static extension-type-member method G|constructor#<T extends core::Object? = dynamic>(self::G|constructor#::T% o) → self::G<self::G|constructor#::T%>% /* erasure=self::G|constructor#::T%, declared=! */ {
+  lowered final self::G<self::G|constructor#::T%>% /* erasure=self::G|constructor#::T%, declared=! */ #this = o;
   return #this;
 }
-static extension-type-member method G|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::G|constructor#_#new#tearOff::T% o) → self::G<self::G|constructor#_#new#tearOff::T%> /* = self::G|constructor#_#new#tearOff::T% */
+static extension-type-member method G|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::G|constructor#_#new#tearOff::T% o) → self::G<self::G|constructor#_#new#tearOff::T%>% /* erasure=self::G|constructor#_#new#tearOff::T%, declared=! */
   return self::G|constructor#<self::G|constructor#_#new#tearOff::T%>(o);
-static extension-type-member method G2|constructor#<T extends core::Object>(self::G2|constructor#::T o) → self::G2<self::G2|constructor#::T> /* = self::G2|constructor#::T */ {
-  lowered final self::G2<self::G2|constructor#::T> /* = self::G2|constructor#::T */ #this = o;
+static extension-type-member method G2|constructor#<T extends core::Object>(self::G2|constructor#::T o) → self::G2<self::G2|constructor#::T> /* erasure=self::G2|constructor#::T */ {
+  lowered final self::G2<self::G2|constructor#::T> /* erasure=self::G2|constructor#::T */ #this = o;
   return #this;
 }
-static extension-type-member method G2|constructor#_#new#tearOff<T extends core::Object>(self::G2|constructor#_#new#tearOff::T o) → self::G2<self::G2|constructor#_#new#tearOff::T> /* = self::G2|constructor#_#new#tearOff::T */
+static extension-type-member method G2|constructor#_#new#tearOff<T extends core::Object>(self::G2|constructor#_#new#tearOff::T o) → self::G2<self::G2|constructor#_#new#tearOff::T> /* erasure=self::G2|constructor#_#new#tearOff::T */
   return self::G2|constructor#<self::G2|constructor#_#new#tearOff::T>(o);
-static method test<T1 extends core::Object? = dynamic, T2 extends self::A, T3 extends core::Object>(core::Object o, self::A a, self::B b, self::C /* = core::Object? */ c, self::D /* = core::Object */ d, self::D2 /* = core::Object */ d2, self::E /* = self::B */ e, self::F /* = self::B */ f, self::G<self::test::T1%> /* = self::test::T1% */ g1, self::G<self::test::T2> /* = self::test::T2 */ g2, self::G2<self::test::T3> /* = self::test::T3 */ g3) → dynamic {
+static method test<T1 extends core::Object? = dynamic, T2 extends self::A, T3 extends core::Object>(core::Object o, self::A a, self::B b, self::C% /* erasure=core::Object?, declared=! */ c, self::D /* erasure=core::Object */ d, self::D2% /* erasure=core::Object, declared=! */ d2, self::E /* erasure=self::B */ e, self::F /* erasure=self::B */ f, self::G<self::test::T1%>% /* erasure=self::test::T1%, declared=! */ g1, self::G<self::test::T2>% /* erasure=self::test::T2, declared=! */ g2, self::G2<self::test::T3> /* erasure=self::test::T3 */ g3) → dynamic {
   o = o;
   o = a;
   o = b;
@@ -465,113 +465,113 @@ static method test<T1 extends core::Object? = dynamic, T2 extends self::A, T3 ex
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:68:7: Error: A value of type 'Object' can't be assigned to a variable of type 'C'.
  - 'Object' is from 'dart:core'.
   c = o; // Error
-      ^" in o as{TypeError} self::C /* = core::Object? */;
+      ^" in o as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:69:7: Error: A value of type 'A' can't be assigned to a variable of type 'C'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   c = a; // Error
-      ^" in a as{TypeError} self::C /* = core::Object? */;
+      ^" in a as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:70:7: Error: A value of type 'B' can't be assigned to a variable of type 'C'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   c = b; // Error
-      ^" in b as{TypeError} self::C /* = core::Object? */;
+      ^" in b as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = c;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:72:7: Error: A value of type 'D' can't be assigned to a variable of type 'C'.
   c = d; // Error
-      ^" in d as{TypeError} self::C /* = core::Object? */;
+      ^" in d as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:73:7: Error: A value of type 'E' can't be assigned to a variable of type 'C'.
   c = e; // Error
-      ^" in e as{TypeError} self::C /* = core::Object? */;
+      ^" in e as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:74:7: Error: A value of type 'F' can't be assigned to a variable of type 'C'.
   c = f; // Error
-      ^" in f as{TypeError} self::C /* = core::Object? */;
+      ^" in f as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:75:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'C'.
   c = g1; // Error
-      ^" in g1 as{TypeError} self::C /* = core::Object? */;
+      ^" in g1 as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:76:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'C'.
   c = g2; // Error
-      ^" in g2 as{TypeError} self::C /* = core::Object? */;
+      ^" in g2 as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:78:7: Error: A value of type 'Object' can't be assigned to a variable of type 'D'.
  - 'Object' is from 'dart:core'.
   d = o; // Error
-      ^" in o as{TypeError} self::D /* = core::Object */;
+      ^" in o as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:79:7: Error: A value of type 'A' can't be assigned to a variable of type 'D'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   d = a; // Error
-      ^" in a as{TypeError} self::D /* = core::Object */;
+      ^" in a as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:80:7: Error: A value of type 'B' can't be assigned to a variable of type 'D'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   d = b; // Error
-      ^" in b as{TypeError} self::D /* = core::Object */;
+      ^" in b as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:81:7: Error: A value of type 'C' can't be assigned to a variable of type 'D'.
   d = c; // Error
-      ^" in c as{TypeError} self::D /* = core::Object */;
+      ^" in c as{TypeError} self::D /* erasure=core::Object */;
   d = d;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:83:7: Error: A value of type 'E' can't be assigned to a variable of type 'D'.
   d = e; // Error
-      ^" in e as{TypeError} self::D /* = core::Object */;
+      ^" in e as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:84:7: Error: A value of type 'F' can't be assigned to a variable of type 'D'.
   d = f; // Error
-      ^" in f as{TypeError} self::D /* = core::Object */;
+      ^" in f as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:85:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'D'.
   d = g1; // Error
-      ^" in g1 as{TypeError} self::D /* = core::Object */;
+      ^" in g1 as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:86:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'D'.
   d = g2; // Error
-      ^" in g2 as{TypeError} self::D /* = core::Object */;
+      ^" in g2 as{TypeError} self::D /* erasure=core::Object */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:88:7: Error: A value of type 'Object' can't be assigned to a variable of type 'E'.
  - 'Object' is from 'dart:core'.
   e = o; // Error
-      ^" in o as{TypeError} self::E /* = self::B */;
+      ^" in o as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:89:7: Error: A value of type 'A' can't be assigned to a variable of type 'E'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   e = a; // Error
-      ^" in a as{TypeError} self::E /* = self::B */;
+      ^" in a as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:90:7: Error: A value of type 'B' can't be assigned to a variable of type 'E'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   e = b; // Error
-      ^" in b as{TypeError} self::E /* = self::B */;
+      ^" in b as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:91:7: Error: A value of type 'C' can't be assigned to a variable of type 'E'.
   e = c; // Error
-      ^" in c as{TypeError} self::E /* = self::B */;
+      ^" in c as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:92:7: Error: A value of type 'D' can't be assigned to a variable of type 'E'.
   e = d; // Error
-      ^" in d as{TypeError} self::E /* = self::B */;
+      ^" in d as{TypeError} self::E /* erasure=self::B */;
   e = e;
   e = f;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:95:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'E'.
   e = g1; // Error
-      ^" in g1 as{TypeError} self::E /* = self::B */;
+      ^" in g1 as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:96:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'E'.
   e = g2; // Error
-      ^" in g2 as{TypeError} self::E /* = self::B */;
+      ^" in g2 as{TypeError} self::E /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:98:7: Error: A value of type 'Object' can't be assigned to a variable of type 'F'.
  - 'Object' is from 'dart:core'.
   f = o; // Error
-      ^" in o as{TypeError} self::F /* = self::B */;
+      ^" in o as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:99:7: Error: A value of type 'A' can't be assigned to a variable of type 'F'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   f = a; // Error
-      ^" in a as{TypeError} self::F /* = self::B */;
+      ^" in a as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:100:7: Error: A value of type 'B' can't be assigned to a variable of type 'F'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   f = b; // Error
-      ^" in b as{TypeError} self::F /* = self::B */;
+      ^" in b as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:101:7: Error: A value of type 'C' can't be assigned to a variable of type 'F'.
   f = c; // Error
-      ^" in c as{TypeError} self::F /* = self::B */;
+      ^" in c as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:102:7: Error: A value of type 'D' can't be assigned to a variable of type 'F'.
   f = d; // Error
-      ^" in d as{TypeError} self::F /* = self::B */;
+      ^" in d as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:103:7: Error: A value of type 'E' can't be assigned to a variable of type 'F'.
   f = e; // Error
-      ^" in e as{TypeError} self::F /* = self::B */;
+      ^" in e as{TypeError} self::F /* erasure=self::B */;
   f = f;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:105:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'F'.
   f = g1; // Error
-      ^" in g1 as{TypeError} self::F /* = self::B */;
+      ^" in g1 as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:106:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'F'.
   f = g2; // Error
-      ^" in g2 as{TypeError} self::F /* = self::B */;
+      ^" in g2 as{TypeError} self::F /* erasure=self::B */;
   g1 = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:108:8: Error: A value of type 'Object' can't be assigned to a variable of type 'G<T1>'.
  - 'Object' is from 'dart:core'.
   g1 = o; // Error

pkg/front_end/testcases/extension_types/assign_interface_type.dart.weak.outline.expect

@@ -30,7 +30,7 @@ extension type E(self::B it) implements self::A {
   constructor • = self::E|constructor#;
   constructor tearoff • = self::E|constructor#_#new#tearOff;
 }
-extension type F(self::B it) implements self::E /* = self::B */, self::B {
+extension type F(self::B it) implements self::E /* erasure=self::B */, self::B {
   abstract extension-type-member representation-field get it() → self::B;
   constructor • = self::F|constructor#;
   constructor tearoff • = self::F|constructor#_#new#tearOff;
@@ -45,33 +45,33 @@ extension type G2<T extends core::Object>(T o) implements core::Object {
   constructor • = self::G2|constructor#;
   constructor tearoff • = self::G2|constructor#_#new#tearOff;
 }
-static extension-type-member method C|constructor#(core::Object? o) → self::C /* = core::Object? */
+static extension-type-member method C|constructor#(core::Object? o) → self::C% /* erasure=core::Object?, declared=! */
   ;
-static extension-type-member method C|constructor#_#new#tearOff(core::Object? o) → self::C /* = core::Object? */
+static extension-type-member method C|constructor#_#new#tearOff(core::Object? o) → self::C% /* erasure=core::Object?, declared=! */
   return self::C|constructor#(o);
-static extension-type-member method D|constructor#(core::Object o) → self::D /* = core::Object */
+static extension-type-member method D|constructor#(core::Object o) → self::D /* erasure=core::Object */
   ;
-static extension-type-member method D|constructor#_#new#tearOff(core::Object o) → self::D /* = core::Object */
+static extension-type-member method D|constructor#_#new#tearOff(core::Object o) → self::D /* erasure=core::Object */
   return self::D|constructor#(o);
-static extension-type-member method D2|constructor#(core::Object o) → self::D2 /* = core::Object */
+static extension-type-member method D2|constructor#(core::Object o) → self::D2% /* erasure=core::Object, declared=! */
   ;
-static extension-type-member method D2|constructor#_#new#tearOff(core::Object o) → self::D2 /* = core::Object */
+static extension-type-member method D2|constructor#_#new#tearOff(core::Object o) → self::D2% /* erasure=core::Object, declared=! */
   return self::D2|constructor#(o);
-static extension-type-member method E|constructor#(self::B it) → self::E /* = self::B */
+static extension-type-member method E|constructor#(self::B it) → self::E /* erasure=self::B */
   ;
-static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* = self::B */
+static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* erasure=self::B */
   return self::E|constructor#(it);
-static extension-type-member method F|constructor#(self::B it) → self::F /* = self::B */
+static extension-type-member method F|constructor#(self::B it) → self::F /* erasure=self::B */
   ;
-static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* = self::B */
+static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* erasure=self::B */
   return self::F|constructor#(it);
-static extension-type-member method G|constructor#<T extends core::Object? = dynamic>(self::G|constructor#::T% o) → self::G<self::G|constructor#::T%> /* = self::G|constructor#::T% */
+static extension-type-member method G|constructor#<T extends core::Object? = dynamic>(self::G|constructor#::T% o) → self::G<self::G|constructor#::T%>% /* erasure=self::G|constructor#::T%, declared=! */
   ;
-static extension-type-member method G|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::G|constructor#_#new#tearOff::T% o) → self::G<self::G|constructor#_#new#tearOff::T%> /* = self::G|constructor#_#new#tearOff::T% */
+static extension-type-member method G|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::G|constructor#_#new#tearOff::T% o) → self::G<self::G|constructor#_#new#tearOff::T%>% /* erasure=self::G|constructor#_#new#tearOff::T%, declared=! */
   return self::G|constructor#<self::G|constructor#_#new#tearOff::T%>(o);
-static extension-type-member method G2|constructor#<T extends core::Object>(self::G2|constructor#::T o) → self::G2<self::G2|constructor#::T> /* = self::G2|constructor#::T */
+static extension-type-member method G2|constructor#<T extends core::Object>(self::G2|constructor#::T o) → self::G2<self::G2|constructor#::T> /* erasure=self::G2|constructor#::T */
   ;
-static extension-type-member method G2|constructor#_#new#tearOff<T extends core::Object>(self::G2|constructor#_#new#tearOff::T o) → self::G2<self::G2|constructor#_#new#tearOff::T> /* = self::G2|constructor#_#new#tearOff::T */
+static extension-type-member method G2|constructor#_#new#tearOff<T extends core::Object>(self::G2|constructor#_#new#tearOff::T o) → self::G2<self::G2|constructor#_#new#tearOff::T> /* erasure=self::G2|constructor#_#new#tearOff::T */
   return self::G2|constructor#<self::G2|constructor#_#new#tearOff::T>(o);
-static method test<T1 extends core::Object? = dynamic, T2 extends self::A, T3 extends core::Object>(core::Object o, self::A a, self::B b, self::C /* = core::Object? */ c, self::D /* = core::Object */ d, self::D2 /* = core::Object */ d2, self::E /* = self::B */ e, self::F /* = self::B */ f, self::G<self::test::T1%> /* = self::test::T1% */ g1, self::G<self::test::T2> /* = self::test::T2 */ g2, self::G2<self::test::T3> /* = self::test::T3 */ g3) → dynamic
+static method test<T1 extends core::Object? = dynamic, T2 extends self::A, T3 extends core::Object>(core::Object o, self::A a, self::B b, self::C% /* erasure=core::Object?, declared=! */ c, self::D /* erasure=core::Object */ d, self::D2% /* erasure=core::Object, declared=! */ d2, self::E /* erasure=self::B */ e, self::F /* erasure=self::B */ f, self::G<self::test::T1%>% /* erasure=self::test::T1%, declared=! */ g1, self::G<self::test::T2>% /* erasure=self::test::T2, declared=! */ g2, self::G2<self::test::T3> /* erasure=self::test::T3 */ g3) → dynamic
   ;

pkg/front_end/testcases/extension_types/assign_interface_type.dart.weak.transformed.expect

@@ -324,7 +324,7 @@ extension type E(self::B it) implements self::A {
   constructor • = self::E|constructor#;
   constructor tearoff • = self::E|constructor#_#new#tearOff;
 }
-extension type F(self::B it) implements self::E /* = self::B */, self::B {
+extension type F(self::B it) implements self::E /* erasure=self::B */, self::B {
   abstract extension-type-member representation-field get it() → self::B;
   constructor • = self::F|constructor#;
   constructor tearoff • = self::F|constructor#_#new#tearOff;
@@ -339,49 +339,49 @@ extension type G2<T extends core::Object>(T o) implements core::Object {
   constructor • = self::G2|constructor#;
   constructor tearoff • = self::G2|constructor#_#new#tearOff;
 }
-static extension-type-member method C|constructor#(core::Object? o) → self::C /* = core::Object? */ {
-  lowered final self::C /* = core::Object? */ #this = o;
+static extension-type-member method C|constructor#(core::Object? o) → self::C% /* erasure=core::Object?, declared=! */ {
+  lowered final self::C% /* erasure=core::Object?, declared=! */ #this = o;
   return #this;
 }
-static extension-type-member method C|constructor#_#new#tearOff(core::Object? o) → self::C /* = core::Object? */
+static extension-type-member method C|constructor#_#new#tearOff(core::Object? o) → self::C% /* erasure=core::Object?, declared=! */
   return self::C|constructor#(o);
-static extension-type-member method D|constructor#(core::Object o) → self::D /* = core::Object */ {
-  lowered final self::D /* = core::Object */ #this = o;
+static extension-type-member method D|constructor#(core::Object o) → self::D /* erasure=core::Object */ {
+  lowered final self::D /* erasure=core::Object */ #this = o;
   return #this;
 }
-static extension-type-member method D|constructor#_#new#tearOff(core::Object o) → self::D /* = core::Object */
+static extension-type-member method D|constructor#_#new#tearOff(core::Object o) → self::D /* erasure=core::Object */
   return self::D|constructor#(o);
-static extension-type-member method D2|constructor#(core::Object o) → self::D2 /* = core::Object */ {
-  lowered final self::D2 /* = core::Object */ #this = o;
+static extension-type-member method D2|constructor#(core::Object o) → self::D2% /* erasure=core::Object, declared=! */ {
+  lowered final self::D2% /* erasure=core::Object, declared=! */ #this = o;
   return #this;
 }
-static extension-type-member method D2|constructor#_#new#tearOff(core::Object o) → self::D2 /* = core::Object */
+static extension-type-member method D2|constructor#_#new#tearOff(core::Object o) → self::D2% /* erasure=core::Object, declared=! */
   return self::D2|constructor#(o);
-static extension-type-member method E|constructor#(self::B it) → self::E /* = self::B */ {
-  lowered final self::E /* = self::B */ #this = it;
+static extension-type-member method E|constructor#(self::B it) → self::E /* erasure=self::B */ {
+  lowered final self::E /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* = self::B */
+static extension-type-member method E|constructor#_#new#tearOff(self::B it) → self::E /* erasure=self::B */
   return self::E|constructor#(it);
-static extension-type-member method F|constructor#(self::B it) → self::F /* = self::B */ {
-  lowered final self::F /* = self::B */ #this = it;
+static extension-type-member method F|constructor#(self::B it) → self::F /* erasure=self::B */ {
+  lowered final self::F /* erasure=self::B */ #this = it;
   return #this;
 }
-static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* = self::B */
+static extension-type-member method F|constructor#_#new#tearOff(self::B it) → self::F /* erasure=self::B */
   return self::F|constructor#(it);
-static extension-type-member method G|constructor#<T extends core::Object? = dynamic>(self::G|constructor#::T% o) → self::G<self::G|constructor#::T%> /* = self::G|constructor#::T% */ {
-  lowered final self::G<self::G|constructor#::T%> /* = self::G|constructor#::T% */ #this = o;
+static extension-type-member method G|constructor#<T extends core::Object? = dynamic>(self::G|constructor#::T% o) → self::G<self::G|constructor#::T%>% /* erasure=self::G|constructor#::T%, declared=! */ {
+  lowered final self::G<self::G|constructor#::T%>% /* erasure=self::G|constructor#::T%, declared=! */ #this = o;
   return #this;
 }
-static extension-type-member method G|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::G|constructor#_#new#tearOff::T% o) → self::G<self::G|constructor#_#new#tearOff::T%> /* = self::G|constructor#_#new#tearOff::T% */
+static extension-type-member method G|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::G|constructor#_#new#tearOff::T% o) → self::G<self::G|constructor#_#new#tearOff::T%>% /* erasure=self::G|constructor#_#new#tearOff::T%, declared=! */
   return self::G|constructor#<self::G|constructor#_#new#tearOff::T%>(o);
-static extension-type-member method G2|constructor#<T extends core::Object>(self::G2|constructor#::T o) → self::G2<self::G2|constructor#::T> /* = self::G2|constructor#::T */ {
-  lowered final self::G2<self::G2|constructor#::T> /* = self::G2|constructor#::T */ #this = o;
+static extension-type-member method G2|constructor#<T extends core::Object>(self::G2|constructor#::T o) → self::G2<self::G2|constructor#::T> /* erasure=self::G2|constructor#::T */ {
+  lowered final self::G2<self::G2|constructor#::T> /* erasure=self::G2|constructor#::T */ #this = o;
   return #this;
 }
-static extension-type-member method G2|constructor#_#new#tearOff<T extends core::Object>(self::G2|constructor#_#new#tearOff::T o) → self::G2<self::G2|constructor#_#new#tearOff::T> /* = self::G2|constructor#_#new#tearOff::T */
+static extension-type-member method G2|constructor#_#new#tearOff<T extends core::Object>(self::G2|constructor#_#new#tearOff::T o) → self::G2<self::G2|constructor#_#new#tearOff::T> /* erasure=self::G2|constructor#_#new#tearOff::T */
   return self::G2|constructor#<self::G2|constructor#_#new#tearOff::T>(o);
-static method test<T1 extends core::Object? = dynamic, T2 extends self::A, T3 extends core::Object>(core::Object o, self::A a, self::B b, self::C /* = core::Object? */ c, self::D /* = core::Object */ d, self::D2 /* = core::Object */ d2, self::E /* = self::B */ e, self::F /* = self::B */ f, self::G<self::test::T1%> /* = self::test::T1% */ g1, self::G<self::test::T2> /* = self::test::T2 */ g2, self::G2<self::test::T3> /* = self::test::T3 */ g3) → dynamic {
+static method test<T1 extends core::Object? = dynamic, T2 extends self::A, T3 extends core::Object>(core::Object o, self::A a, self::B b, self::C% /* erasure=core::Object?, declared=! */ c, self::D /* erasure=core::Object */ d, self::D2% /* erasure=core::Object, declared=! */ d2, self::E /* erasure=self::B */ e, self::F /* erasure=self::B */ f, self::G<self::test::T1%>% /* erasure=self::test::T1%, declared=! */ g1, self::G<self::test::T2>% /* erasure=self::test::T2, declared=! */ g2, self::G2<self::test::T3> /* erasure=self::test::T3 */ g3) → dynamic {
   o = o;
   o = a;
   o = b;
@@ -465,113 +465,113 @@ static method test<T1 extends core::Object? = dynamic, T2 extends self::A, T3 ex
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:68:7: Error: A value of type 'Object' can't be assigned to a variable of type 'C'.
  - 'Object' is from 'dart:core'.
   c = o; // Error
-      ^" in o as{TypeError} self::C /* = core::Object? */;
+      ^" in o as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:69:7: Error: A value of type 'A' can't be assigned to a variable of type 'C'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   c = a; // Error
-      ^" in a as{TypeError} self::C /* = core::Object? */;
+      ^" in a as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:70:7: Error: A value of type 'B' can't be assigned to a variable of type 'C'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   c = b; // Error
-      ^" in b as{TypeError} self::C /* = core::Object? */;
+      ^" in b as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = c;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:72:7: Error: A value of type 'D' can't be assigned to a variable of type 'C'.
   c = d; // Error
-      ^" in d as{TypeError} self::C /* = core::Object? */;
+      ^" in d as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:73:7: Error: A value of type 'E' can't be assigned to a variable of type 'C'.
   c = e; // Error
-      ^" in e as{TypeError} self::C /* = core::Object? */;
+      ^" in e as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:74:7: Error: A value of type 'F' can't be assigned to a variable of type 'C'.
   c = f; // Error
-      ^" in f as{TypeError} self::C /* = core::Object? */;
+      ^" in f as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:75:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'C'.
   c = g1; // Error
-      ^" in g1 as{TypeError} self::C /* = core::Object? */;
+      ^" in g1 as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   c = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:76:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'C'.
   c = g2; // Error
-      ^" in g2 as{TypeError} self::C /* = core::Object? */;
+      ^" in g2 as{TypeError} self::C% /* erasure=core::Object?, declared=! */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:78:7: Error: A value of type 'Object' can't be assigned to a variable of type 'D'.
  - 'Object' is from 'dart:core'.
   d = o; // Error
-      ^" in o as{TypeError} self::D /* = core::Object */;
+      ^" in o as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:79:7: Error: A value of type 'A' can't be assigned to a variable of type 'D'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   d = a; // Error
-      ^" in a as{TypeError} self::D /* = core::Object */;
+      ^" in a as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:80:7: Error: A value of type 'B' can't be assigned to a variable of type 'D'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   d = b; // Error
-      ^" in b as{TypeError} self::D /* = core::Object */;
+      ^" in b as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:81:7: Error: A value of type 'C' can't be assigned to a variable of type 'D'.
   d = c; // Error
-      ^" in c as{TypeError} self::D /* = core::Object */;
+      ^" in c as{TypeError} self::D /* erasure=core::Object */;
   d = d;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:83:7: Error: A value of type 'E' can't be assigned to a variable of type 'D'.
   d = e; // Error
-      ^" in e as{TypeError} self::D /* = core::Object */;
+      ^" in e as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:84:7: Error: A value of type 'F' can't be assigned to a variable of type 'D'.
   d = f; // Error
-      ^" in f as{TypeError} self::D /* = core::Object */;
+      ^" in f as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:85:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'D'.
   d = g1; // Error
-      ^" in g1 as{TypeError} self::D /* = core::Object */;
+      ^" in g1 as{TypeError} self::D /* erasure=core::Object */;
   d = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:86:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'D'.
   d = g2; // Error
-      ^" in g2 as{TypeError} self::D /* = core::Object */;
+      ^" in g2 as{TypeError} self::D /* erasure=core::Object */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:88:7: Error: A value of type 'Object' can't be assigned to a variable of type 'E'.
  - 'Object' is from 'dart:core'.
   e = o; // Error
-      ^" in o as{TypeError} self::E /* = self::B */;
+      ^" in o as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:89:7: Error: A value of type 'A' can't be assigned to a variable of type 'E'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   e = a; // Error
-      ^" in a as{TypeError} self::E /* = self::B */;
+      ^" in a as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:90:7: Error: A value of type 'B' can't be assigned to a variable of type 'E'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   e = b; // Error
-      ^" in b as{TypeError} self::E /* = self::B */;
+      ^" in b as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:91:7: Error: A value of type 'C' can't be assigned to a variable of type 'E'.
   e = c; // Error
-      ^" in c as{TypeError} self::E /* = self::B */;
+      ^" in c as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:92:7: Error: A value of type 'D' can't be assigned to a variable of type 'E'.
   e = d; // Error
-      ^" in d as{TypeError} self::E /* = self::B */;
+      ^" in d as{TypeError} self::E /* erasure=self::B */;
   e = e;
   e = f;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:95:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'E'.
   e = g1; // Error
-      ^" in g1 as{TypeError} self::E /* = self::B */;
+      ^" in g1 as{TypeError} self::E /* erasure=self::B */;
   e = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:96:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'E'.
   e = g2; // Error
-      ^" in g2 as{TypeError} self::E /* = self::B */;
+      ^" in g2 as{TypeError} self::E /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:98:7: Error: A value of type 'Object' can't be assigned to a variable of type 'F'.
  - 'Object' is from 'dart:core'.
   f = o; // Error
-      ^" in o as{TypeError} self::F /* = self::B */;
+      ^" in o as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:99:7: Error: A value of type 'A' can't be assigned to a variable of type 'F'.
  - 'A' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   f = a; // Error
-      ^" in a as{TypeError} self::F /* = self::B */;
+      ^" in a as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:100:7: Error: A value of type 'B' can't be assigned to a variable of type 'F'.
  - 'B' is from 'pkg/front_end/testcases/extension_types/assign_interface_type.dart'.
   f = b; // Error
-      ^" in b as{TypeError} self::F /* = self::B */;
+      ^" in b as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:101:7: Error: A value of type 'C' can't be assigned to a variable of type 'F'.
   f = c; // Error
-      ^" in c as{TypeError} self::F /* = self::B */;
+      ^" in c as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:102:7: Error: A value of type 'D' can't be assigned to a variable of type 'F'.
   f = d; // Error
-      ^" in d as{TypeError} self::F /* = self::B */;
+      ^" in d as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:103:7: Error: A value of type 'E' can't be assigned to a variable of type 'F'.
   f = e; // Error
-      ^" in e as{TypeError} self::F /* = self::B */;
+      ^" in e as{TypeError} self::F /* erasure=self::B */;
   f = f;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:105:7: Error: A value of type 'G<T1>' can't be assigned to a variable of type 'F'.
   f = g1; // Error
-      ^" in g1 as{TypeError} self::F /* = self::B */;
+      ^" in g1 as{TypeError} self::F /* erasure=self::B */;
   f = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:106:7: Error: A value of type 'G<T2>' can't be assigned to a variable of type 'F'.
   f = g2; // Error
-      ^" in g2 as{TypeError} self::F /* = self::B */;
+      ^" in g2 as{TypeError} self::F /* erasure=self::B */;
   g1 = invalid-expression "pkg/front_end/testcases/extension_types/assign_interface_type.dart:108:8: Error: A value of type 'Object' can't be assigned to a variable of type 'G<T1>'.
  - 'Object' is from 'dart:core'.
   g1 = o; // Error

pkg/front_end/testcases/extension_types/await.dart.strong.expect

@@ -13,23 +13,23 @@ extension type V2<T extends asy::Future<core::Object>>(T id) implements asy::Fut
   constructor • = self::V2|constructor#;
   constructor tearoff • = self::V2|constructor#_#new#tearOff;
 }
-static extension-type-member method V1|constructor#(asy::Future<core::int> id) → self::V1 /* = asy::Future<core::int> */ {
-  lowered final self::V1 /* = asy::Future<core::int> */ #this = id;
+static extension-type-member method V1|constructor#(asy::Future<core::int> id) → self::V1 /* erasure=asy::Future<core::int> */ {
+  lowered final self::V1 /* erasure=asy::Future<core::int> */ #this = id;
   return #this;
 }
-static extension-type-member method V1|constructor#_#new#tearOff(asy::Future<core::int> id) → self::V1 /* = asy::Future<core::int> */
+static extension-type-member method V1|constructor#_#new#tearOff(asy::Future<core::int> id) → self::V1 /* erasure=asy::Future<core::int> */
   return self::V1|constructor#(id);
-static extension-type-member method V2|constructor#<T extends asy::Future<core::Object>>(self::V2|constructor#::T id) → self::V2<self::V2|constructor#::T> /* = self::V2|constructor#::T */ {
-  lowered final self::V2<self::V2|constructor#::T> /* = self::V2|constructor#::T */ #this = id;
+static extension-type-member method V2|constructor#<T extends asy::Future<core::Object>>(self::V2|constructor#::T id) → self::V2<self::V2|constructor#::T> /* erasure=self::V2|constructor#::T */ {
+  lowered final self::V2<self::V2|constructor#::T> /* erasure=self::V2|constructor#::T */ #this = id;
   return #this;
 }
-static extension-type-member method V2|constructor#_#new#tearOff<T extends asy::Future<core::Object>>(self::V2|constructor#_#new#tearOff::T id) → self::V2<self::V2|constructor#_#new#tearOff::T> /* = self::V2|constructor#_#new#tearOff::T */
+static extension-type-member method V2|constructor#_#new#tearOff<T extends asy::Future<core::Object>>(self::V2|constructor#_#new#tearOff::T id) → self::V2<self::V2|constructor#_#new#tearOff::T> /* erasure=self::V2|constructor#_#new#tearOff::T */
   return self::V2|constructor#<self::V2|constructor#_#new#tearOff::T>(id);
 static method main() → dynamic async /* emittedValueType= dynamic */ {
-  self::V1 /* = asy::Future<core::int> */ v1 = self::V1|constructor#(asy::Future::value<core::int>(42));
+  self::V1 /* erasure=asy::Future<core::int> */ v1 = self::V1|constructor#(asy::Future::value<core::int>(42));
   core::int _v1 = await v1;
   self::expect(42, _v1);
-  self::V2<asy::Future<core::String>> /* = asy::Future<core::String> */ v2 = self::V2|constructor#<asy::Future<core::String>>(asy::Future::value<core::String>("42"));
+  self::V2<asy::Future<core::String>> /* erasure=asy::Future<core::String> */ v2 = self::V2|constructor#<asy::Future<core::String>>(asy::Future::value<core::String>("42"));
   core::Object _v2 = await v2;
   self::expect("42", _v2);
 }

pkg/front_end/testcases/extension_types/await.dart.strong.transformed.expect

@@ -13,23 +13,23 @@ extension type V2<T extends asy::Future<core::Object>>(T id) implements asy::Fut
   constructor • = self::V2|constructor#;
   constructor tearoff • = self::V2|constructor#_#new#tearOff;
 }
-static extension-type-member method V1|constructor#(asy::Future<core::int> id) → self::V1 /* = asy::Future<core::int> */ {
-  lowered final self::V1 /* = asy::Future<core::int> */ #this = id;
+static extension-type-member method V1|constructor#(asy::Future<core::int> id) → self::V1 /* erasure=asy::Future<core::int> */ {
+  lowered final self::V1 /* erasure=asy::Future<core::int> */ #this = id;
   return #this;
 }
-static extension-type-member method V1|constructor#_#new#tearOff(asy::Future<core::int> id) → self::V1 /* = asy::Future<core::int> */
+static extension-type-member method V1|constructor#_#new#tearOff(asy::Future<core::int> id) → self::V1 /* erasure=asy::Future<core::int> */
   return self::V1|constructor#(id);
-static extension-type-member method V2|constructor#<T extends asy::Future<core::Object>>(self::V2|constructor#::T id) → self::V2<self::V2|constructor#::T> /* = self::V2|constructor#::T */ {
-  lowered final self::V2<self::V2|constructor#::T> /* = self::V2|constructor#::T */ #this = id;
+static extension-type-member method V2|constructor#<T extends asy::Future<core::Object>>(self::V2|constructor#::T id) → self::V2<self::V2|constructor#::T> /* erasure=self::V2|constructor#::T */ {
+  lowered final self::V2<self::V2|constructor#::T> /* erasure=self::V2|constructor#::T */ #this = id;
   return #this;
 }
-static extension-type-member method V2|constructor#_#new#tearOff<T extends asy::Future<core::Object>>(self::V2|constructor#_#new#tearOff::T id) → self::V2<self::V2|constructor#_#new#tearOff::T> /* = self::V2|constructor#_#new#tearOff::T */
+static extension-type-member method V2|constructor#_#new#tearOff<T extends asy::Future<core::Object>>(self::V2|constructor#_#new#tearOff::T id) → self::V2<self::V2|constructor#_#new#tearOff::T> /* erasure=self::V2|constructor#_#new#tearOff::T */
   return self::V2|constructor#<self::V2|constructor#_#new#tearOff::T>(id);
 static method main() → dynamic async /* emittedValueType= dynamic */ {
-  self::V1 /* = asy::Future<core::int> */ v1 = self::V1|constructor#(asy::Future::value<core::int>(42));
+  self::V1 /* erasure=asy::Future<core::int> */ v1 = self::V1|constructor#(asy::Future::value<core::int>(42));
   core::int _v1 = await v1;
   self::expect(42, _v1);
-  self::V2<asy::Future<core::String>> /* = asy::Future<core::String> */ v2 = self::V2|constructor#<asy::Future<core::String>>(asy::Future::value<core::String>("42"));
+  self::V2<asy::Future<core::String>> /* erasure=asy::Future<core::String> */ v2 = self::V2|constructor#<asy::Future<core::String>>(asy::Future::value<core::String>("42"));
   core::Object _v2 = await v2;
   self::expect("42", _v2);
 }

pkg/front_end/testcases/extension_types/await.dart.weak.expect

@@ -13,23 +13,23 @@ extension type V2<T extends asy::Future<core::Object>>(T id) implements asy::Fut
   constructor • = self::V2|constructor#;
   constructor tearoff • = self::V2|constructor#_#new#tearOff;
 }
-static extension-type-member method V1|constructor#(asy::Future<core::int> id) → self::V1 /* = asy::Future<core::int> */ {
-  lowered final self::V1 /* = asy::Future<core::int> */ #this = id;
+static extension-type-member method V1|constructor#(asy::Future<core::int> id) → self::V1 /* erasure=asy::Future<core::int> */ {
+  lowered final self::V1 /* erasure=asy::Future<core::int> */ #this = id;
   return #this;
 }
-static extension-type-member method V1|constructor#_#new#tearOff(asy::Future<core::int> id) → self::V1 /* = asy::Future<core::int> */
+static extension-type-member method V1|constructor#_#new#tearOff(asy::Future<core::int> id) → self::V1 /* erasure=asy::Future<core::int> */
   return self::V1|constructor#(id);
-static extension-type-member method V2|constructor#<T extends asy::Future<core::Object>>(self::V2|constructor#::T id) → self::V2<self::V2|constructor#::T> /* = self::V2|constructor#::T */ {
-  lowered final self::V2<self::V2|constructor#::T> /* = self::V2|constructor#::T */ #this = id;
+static extension-type-member method V2|constructor#<T extends asy::Future<core::Object>>(self::V2|constructor#::T id) → self::V2<self::V2|constructor#::T> /* erasure=self::V2|constructor#::T */ {
+  lowered final self::V2<self::V2|constructor#::T> /* erasure=self::V2|constructor#::T */ #this = id;
   return #this;
 }
-static extension-type-member method V2|constructor#_#new#tearOff<T extends asy::Future<core::Object>>(self::V2|constructor#_#new#tearOff::T id) → self::V2<self::V2|constructor#_#new#tearOff::T> /* = self::V2|constructor#_#new#tearOff::T */
+static extension-type-member method V2|constructor#_#new#tearOff<T extends asy::Future<core::Object>>(self::V2|constructor#_#new#tearOff::T id) → self::V2<self::V2|constructor#_#new#tearOff::T> /* erasure=self::V2|constructor#_#new#tearOff::T */
   return self::V2|constructor#<self::V2|constructor#_#new#tearOff::T>(id);
 static method main() → dynamic async /* emittedValueType= dynamic */ {
-  self::V1 /* = asy::Future<core::int> */ v1 = self::V1|constructor#(asy::Future::value<core::int>(42));
+  self::V1 /* erasure=asy::Future<core::int> */ v1 = self::V1|constructor#(asy::Future::value<core::int>(42));
   core::int _v1 = await v1;
   self::expect(42, _v1);
-  self::V2<asy::Future<core::String>> /* = asy::Future<core::String> */ v2 = self::V2|constructor#<asy::Future<core::String>>(asy::Future::value<core::String>("42"));
+  self::V2<asy::Future<core::String>> /* erasure=asy::Future<core::String> */ v2 = self::V2|constructor#<asy::Future<core::String>>(asy::Future::value<core::String>("42"));
   core::Object _v2 = await v2;
   self::expect("42", _v2);
 }

pkg/front_end/testcases/extension_types/await.dart.weak.modular.expect

@@ -13,23 +13,23 @@ extension type V2<T extends asy::Future<core::Object>>(T id) implements asy::Fut
   constructor • = self::V2|constructor#;
   constructor tearoff • = self::V2|constructor#_#new#tearOff;
 }
-static extension-type-member method V1|constructor#(asy::Future<core::int> id) → self::V1 /* = asy::Future<core::int> */ {
-  lowered final self::V1 /* = asy::Future<core::int> */ #this = id;
+static extension-type-member method V1|constructor#(asy::Future<core::int> id) → self::V1 /* erasure=asy::Future<core::int> */ {
+  lowered final self::V1 /* erasure=asy::Future<core::int> */ #this = id;
   return #this;
 }
-static extension-type-member method V1|constructor#_#new#tearOff(asy::Future<core::int> id) → self::V1 /* = asy::Future<core::int> */
+static extension-type-member method V1|constructor#_#new#tearOff(asy::Future<core::int> id) → self::V1 /* erasure=asy::Future<core::int> */
   return self::V1|constructor#(id);
-static extension-type-member method V2|constructor#<T extends asy::Future<core::Object>>(self::V2|constructor#::T id) → self::V2<self::V2|constructor#::T> /* = self::V2|constructor#::T */ {
-  lowered final self::V2<self::V2|constructor#::T> /* = self::V2|constructor#::T */ #this = id;
+static extension-type-member method V2|constructor#<T extends asy::Future<core::Object>>(self::V2|constructor#::T id) → self::V2<self::V2|constructor#::T> /* erasure=self::V2|constructor#::T */ {
+  lowered final self::V2<self::V2|constructor#::T> /* erasure=self::V2|constructor#::T */ #this = id;
   return #this;
 }
-static extension-type-member method V2|constructor#_#new#tearOff<T extends asy::Future<core::Object>>(self::V2|constructor#_#new#tearOff::T id) → self::V2<self::V2|constructor#_#new#tearOff::T> /* = self::V2|constructor#_#new#tearOff::T */
+static extension-type-member method V2|constructor#_#new#tearOff<T extends asy::Future<core::Object>>(self::V2|constructor#_#new#tearOff::T id) → self::V2<self::V2|constructor#_#new#tearOff::T> /* erasure=self::V2|constructor#_#new#tearOff::T */
   return self::V2|constructor#<self::V2|constructor#_#new#tearOff::T>(id);
 static method main() → dynamic async /* emittedValueType= dynamic */ {
-  self::V1 /* = asy::Future<core::int> */ v1 = self::V1|constructor#(asy::Future::value<core::int>(42));
+  self::V1 /* erasure=asy::Future<core::int> */ v1 = self::V1|constructor#(asy::Future::value<core::int>(42));
   core::int _v1 = await v1;
   self::expect(42, _v1);
-  self::V2<asy::Future<core::String>> /* = asy::Future<core::String> */ v2 = self::V2|constructor#<asy::Future<core::String>>(asy::Future::value<core::String>("42"));
+  self::V2<asy::Future<core::String>> /* erasure=asy::Future<core::String> */ v2 = self::V2|constructor#<asy::Future<core::String>>(asy::Future::value<core::String>("42"));
   core::Object _v2 = await v2;
   self::expect("42", _v2);
 }

pkg/front_end/testcases/extension_types/await.dart.weak.outline.expect

@@ -13,13 +13,13 @@ extension type V2<T extends asy::Future<core::Object>>(T id) implements asy::Fut
   constructor • = self::V2|constructor#;
   constructor tearoff • = self::V2|constructor#_#new#tearOff;
 }
-static extension-type-member method V1|constructor#(asy::Future<core::int> id) → self::V1 /* = asy::Future<core::int> */
+static extension-type-member method V1|constructor#(asy::Future<core::int> id) → self::V1 /* erasure=asy::Future<core::int> */
   ;
-static extension-type-member method V1|constructor#_#new#tearOff(asy::Future<core::int> id) → self::V1 /* = asy::Future<core::int> */
+static extension-type-member method V1|constructor#_#new#tearOff(asy::Future<core::int> id) → self::V1 /* erasure=asy::Future<core::int> */
   return self::V1|constructor#(id);
-static extension-type-member method V2|constructor#<T extends asy::Future<core::Object>>(self::V2|constructor#::T id) → self::V2<self::V2|constructor#::T> /* = self::V2|constructor#::T */
+static extension-type-member method V2|constructor#<T extends asy::Future<core::Object>>(self::V2|constructor#::T id) → self::V2<self::V2|constructor#::T> /* erasure=self::V2|constructor#::T */
   ;
-static extension-type-member method V2|constructor#_#new#tearOff<T extends asy::Future<core::Object>>(self::V2|constructor#_#new#tearOff::T id) → self::V2<self::V2|constructor#_#new#tearOff::T> /* = self::V2|constructor#_#new#tearOff::T */
+static extension-type-member method V2|constructor#_#new#tearOff<T extends asy::Future<core::Object>>(self::V2|constructor#_#new#tearOff::T id) → self::V2<self::V2|constructor#_#new#tearOff::T> /* erasure=self::V2|constructor#_#new#tearOff::T */
   return self::V2|constructor#<self::V2|constructor#_#new#tearOff::T>(id);
 static method main() → dynamic async 
   ;

pkg/front_end/testcases/extension_types/await.dart.weak.transformed.expect

@@ -13,23 +13,23 @@ extension type V2<T extends asy::Future<core::Object>>(T id) implements asy::Fut
   constructor • = self::V2|constructor#;
   constructor tearoff • = self::V2|constructor#_#new#tearOff;
 }
-static extension-type-member method V1|constructor#(asy::Future<core::int> id) → self::V1 /* = asy::Future<core::int> */ {
-  lowered final self::V1 /* = asy::Future<core::int> */ #this = id;
+static extension-type-member method V1|constructor#(asy::Future<core::int> id) → self::V1 /* erasure=asy::Future<core::int> */ {
+  lowered final self::V1 /* erasure=asy::Future<core::int> */ #this = id;
   return #this;
 }
-static extension-type-member method V1|constructor#_#new#tearOff(asy::Future<core::int> id) → self::V1 /* = asy::Future<core::int> */
+static extension-type-member method V1|constructor#_#new#tearOff(asy::Future<core::int> id) → self::V1 /* erasure=asy::Future<core::int> */
   return self::V1|constructor#(id);
-static extension-type-member method V2|constructor#<T extends asy::Future<core::Object>>(self::V2|constructor#::T id) → self::V2<self::V2|constructor#::T> /* = self::V2|constructor#::T */ {
-  lowered final self::V2<self::V2|constructor#::T> /* = self::V2|constructor#::T */ #this = id;
+static extension-type-member method V2|constructor#<T extends asy::Future<core::Object>>(self::V2|constructor#::T id) → self::V2<self::V2|constructor#::T> /* erasure=self::V2|constructor#::T */ {
+  lowered final self::V2<self::V2|constructor#::T> /* erasure=self::V2|constructor#::T */ #this = id;
   return #this;
 }
-static extension-type-member method V2|constructor#_#new#tearOff<T extends asy::Future<core::Object>>(self::V2|constructor#_#new#tearOff::T id) → self::V2<self::V2|constructor#_#new#tearOff::T> /* = self::V2|constructor#_#new#tearOff::T */
+static extension-type-member method V2|constructor#_#new#tearOff<T extends asy::Future<core::Object>>(self::V2|constructor#_#new#tearOff::T id) → self::V2<self::V2|constructor#_#new#tearOff::T> /* erasure=self::V2|constructor#_#new#tearOff::T */
   return self::V2|constructor#<self::V2|constructor#_#new#tearOff::T>(id);
 static method main() → dynamic async /* emittedValueType= dynamic */ {
-  self::V1 /* = asy::Future<core::int> */ v1 = self::V1|constructor#(asy::Future::value<core::int>(42));
+  self::V1 /* erasure=asy::Future<core::int> */ v1 = self::V1|constructor#(asy::Future::value<core::int>(42));
   core::int _v1 = await v1;
   self::expect(42, _v1);
-  self::V2<asy::Future<core::String>> /* = asy::Future<core::String> */ v2 = self::V2|constructor#<asy::Future<core::String>>(asy::Future::value<core::String>("42"));
+  self::V2<asy::Future<core::String>> /* erasure=asy::Future<core::String> */ v2 = self::V2|constructor#<asy::Future<core::String>>(asy::Future::value<core::String>("42"));
   core::Object _v2 = await v2;
   self::expect("42", _v2);
 }

pkg/front_end/testcases/extension_types/built_in_types.dart.strong.expect

@@ -19,13 +19,13 @@ class B extends core::Object implements self::A {
     : super core::Object::•()
     ;
   @#C1
-  get hashCode() → self::IntET /* = core::int */
+  get hashCode() → self::IntET /* erasure=core::int */
     return self::IntET|constructor#(super.{core::Object::hashCode});
   @#C1
-  get runtimeType() → self::TypeET /* = core::Type */
+  get runtimeType() → self::TypeET /* erasure=core::Type */
     return self::TypeET|constructor#(super.{core::Object::runtimeType});
   @#C1
-  operator ==(core::Object? other) → self::BoolET /* = core::bool */
+  operator ==(core::Object? other) → self::BoolET /* erasure=core::bool */
     return self::BoolET|constructor#(other =={core::Object::==}{(core::Object) → core::bool} this);
 }
 extension type ET1(self::B b) implements self::A {
@@ -33,7 +33,7 @@ extension type ET1(self::B b) implements self::A {
   constructor • = self::ET1|constructor#;
   constructor tearoff • = self::ET1|constructor#_#new#tearOff;
 }
-extension type ET2(self::B b) implements self::ET1 /* = self::B */, self::B {
+extension type ET2(self::B b) implements self::ET1 /* erasure=self::B */, self::B {
   abstract extension-type-member representation-field get b() → self::B;
   constructor • = self::ET2|constructor#;
   constructor tearoff • = self::ET2|constructor#_#new#tearOff;
@@ -53,47 +53,47 @@ extension type BoolET(core::bool b) implements core::bool {
   constructor • = self::BoolET|constructor#;
   constructor tearoff • = self::BoolET|constructor#_#new#tearOff;
 }
-static extension-type-member method ET1|constructor#(self::B b) → self::ET1 /* = self::B */ {
-  lowered final self::ET1 /* = self::B */ #this = b;
+static extension-type-member method ET1|constructor#(self::B b) → self::ET1 /* erasure=self::B */ {
+  lowered final self::ET1 /* erasure=self::B */ #this = b;
   return #this;
 }
-static extension-type-member method ET1|constructor#_#new#tearOff(self::B b) → self::ET1 /* = self::B */
+static extension-type-member method ET1|constructor#_#new#tearOff(self::B b) → self::ET1 /* erasure=self::B */
   return self::ET1|constructor#(b);
-static extension-type-member method ET2|constructor#(self::B b) → self::ET2 /* = self::B */ {
-  lowered final self::ET2 /* = self::B */ #this = b;
+static extension-type-member method ET2|constructor#(self::B b) → self::ET2 /* erasure=self::B */ {
+  lowered final self::ET2 /* erasure=self::B */ #this = b;
   return #this;
 }
-static extension-type-member method ET2|constructor#_#new#tearOff(self::B b) → self::ET2 /* = self::B */
+static extension-type-member method ET2|constructor#_#new#tearOff(self::B b) → self::ET2 /* erasure=self::B */
   return self::ET2|constructor#(b);
-static extension-type-member method IntET|constructor#(core::int i) → self::IntET /* = core::int */ {
-  lowered final self::IntET /* = core::int */ #this = i;
+static extension-type-member method IntET|constructor#(core::int i) → self::IntET /* erasure=core::int */ {
+  lowered final self::IntET /* erasure=core::int */ #this = i;
   return #this;
 }
-static extension-type-member method IntET|constructor#_#new#tearOff(core::int i) → self::IntET /* = core::int */
+static extension-type-member method IntET|constructor#_#new#tearOff(core::int i) → self::IntET /* erasure=core::int */
   return self::IntET|constructor#(i);
-static extension-type-member method TypeET|constructor#(core::Type t) → self::TypeET /* = core::Type */ {
-  lowered final self::TypeET /* = core::Type */ #this = t;
+static extension-type-member method TypeET|constructor#(core::Type t) → self::TypeET /* erasure=core::Type */ {
+  lowered final self::TypeET /* erasure=core::Type */ #this = t;
   return #this;
 }
-static extension-type-member method TypeET|constructor#_#new#tearOff(core::Type t) → self::TypeET /* = core::Type */
+static extension-type-member method TypeET|constructor#_#new#tearOff(core::Type t) → self::TypeET /* erasure=core::Type */
   return self::TypeET|constructor#(t);
-static extension-type-member method BoolET|constructor#(core::bool b) → self::BoolET /* = core::bool */ {
-  lowered final self::BoolET /* = core::bool */ #this = b;
+static extension-type-member method BoolET|constructor#(core::bool b) → self::BoolET /* erasure=core::bool */ {
+  lowered final self::BoolET /* erasure=core::bool */ #this = b;
   return #this;
 }
-static extension-type-member method BoolET|constructor#_#new#tearOff(core::bool b) → self::BoolET /* = core::bool */
+static extension-type-member method BoolET|constructor#_#new#tearOff(core::bool b) → self::BoolET /* erasure=core::bool */
   return self::BoolET|constructor#(b);
 static method test() → void {
-  self::ET2 /* = self::B */ e2 = self::ET2|constructor#(new self::B::•());
-  self::ET1 /* = self::B */ e1 = e2;
+  self::ET2 /* erasure=self::B */ e2 = self::ET2|constructor#(new self::B::•());
+  self::ET1 /* erasure=self::B */ e1 = e2;
   core::int hc1 = e1.{core::Object::hashCode}{core::int};
-  self::IntET /* = core::int */ hc2 = e2.{self::B::hashCode}{self::IntET /* = core::int */};
+  self::IntET /* erasure=core::int */ hc2 = e2.{self::B::hashCode}{self::IntET /* erasure=core::int */};
   core::Type t1 = e1.{core::Object::runtimeType}{core::Type};
-  self::TypeET /* = core::Type */ t2 = e2.{self::B::runtimeType}{self::TypeET /* = core::Type */};
+  self::TypeET /* erasure=core::Type */ t2 = e2.{self::B::runtimeType}{self::TypeET /* erasure=core::Type */};
   core::bool b1 = e1 =={core::Object::==}{(core::Object) → core::bool} e1;
-  self::BoolET /* = core::bool */ b2 = invalid-expression "pkg/front_end/testcases/extension_types/built_in_types.dart:43:18: Error: A value of type 'bool' can't be assigned to a variable of type 'BoolET'.
+  self::BoolET /* erasure=core::bool */ b2 = invalid-expression "pkg/front_end/testcases/extension_types/built_in_types.dart:43:18: Error: A value of type 'bool' can't be assigned to a variable of type 'BoolET'.
   BoolET b2 = e2 == e2; /* Error */
-                 ^" in (e2 =={self::B::==}{(core::Object?) → self::BoolET /* = core::bool */} e2) as{TypeError} self::BoolET /* = core::bool */;
+                 ^" in (e2 =={self::B::==}{(core::Object?) → self::BoolET /* erasure=core::bool */} e2) as{TypeError} self::BoolET /* erasure=core::bool */;
 }
 
 constants  {

pkg/front_end/testcases/extension_types/built_in_types.dart.strong.transformed.expect

@@ -19,13 +19,13 @@ class B extends core::Object implements self::A {
     : super core::Object::•()
     ;
   @#C1
-  get hashCode() → self::IntET /* = core::int */
+  get hashCode() → self::IntET /* erasure=core::int */
     return self::IntET|constructor#(super.{core::Object::hashCode});
   @#C1
-  get runtimeType() → self::TypeET /* = core::Type */
+  get runtimeType() → self::TypeET /* erasure=core::Type */
     return self::TypeET|constructor#(super.{core::Object::runtimeType});
   @#C1
-  operator ==(core::Object? other) → self::BoolET /* = core::bool */
+  operator ==(core::Object? other) → self::BoolET /* erasure=core::bool */
     return self::BoolET|constructor#(other =={core::Object::==}{(core::Object) → core::bool} this);
 }
 extension type ET1(self::B b) implements self::A {
@@ -33,7 +33,7 @@ extension type ET1(self::B b) implements self::A {
   constructor • = self::ET1|constructor#;
   constructor tearoff • = self::ET1|constructor#_#new#tearOff;
 }
-extension type ET2(self::B b) implements self::ET1 /* = self::B */, self::B {
+extension type ET2(self::B b) implements self::ET1 /* erasure=self::B */, self::B {
   abstract extension-type-member representation-field get b() → self::B;
   constructor • = self::ET2|constructor#;
   constructor tearoff • = self::ET2|constructor#_#new#tearOff;
@@ -53,47 +53,47 @@ extension type BoolET(core::bool b) implements core::bool {
   constructor • = self::BoolET|constructor#;
   constructor tearoff • = self::BoolET|constructor#_#new#tearOff;
 }
-static extension-type-member method ET1|constructor#(self::B b) → self::ET1 /* = self::B */ {
-  lowered final self::ET1 /* = self::B */ #this = b;
+static extension-type-member method ET1|constructor#(self::B b) → self::ET1 /* erasure=self::B */ {
+  lowered final self::ET1 /* erasure=self::B */ #this = b;
   return #this;
 }
-static extension-type-member method ET1|constructor#_#new#tearOff(self::B b) → self::ET1 /* = self::B */
+static extension-type-member method ET1|constructor#_#new#tearOff(self::B b) → self::ET1 /* erasure=self::B */
   return self::ET1|constructor#(b);
-static extension-type-member method ET2|constructor#(self::B b) → self::ET2 /* = self::B */ {
-  lowered final self::ET2 /* = self::B */ #this = b;
+static extension-type-member method ET2|constructor#(self::B b) → self::ET2 /* erasure=self::B */ {
+  lowered final self::ET2 /* erasure=self::B */ #this = b;
   return #this;
 }
-static extension-type-member method ET2|constructor#_#new#tearOff(self::B b) → self::ET2 /* = self::B */
+static extension-type-member method ET2|constructor#_#new#tearOff(self::B b) → self::ET2 /* erasure=self::B */
   return self::ET2|constructor#(b);
-static extension-type-member method IntET|constructor#(core::int i) → self::IntET /* = core::int */ {
-  lowered final self::IntET /* = core::int */ #this = i;
+static extension-type-member method IntET|constructor#(core::int i) → self::IntET /* erasure=core::int */ {
+  lowered final self::IntET /* erasure=core::int */ #this = i;
   return #this;
 }
-static extension-type-member method IntET|constructor#_#new#tearOff(core::int i) → self::IntET /* = core::int */
+static extension-type-member method IntET|constructor#_#new#tearOff(core::int i) → self::IntET /* erasure=core::int */
   return self::IntET|constructor#(i);
-static extension-type-member method TypeET|constructor#(core::Type t) → self::TypeET /* = core::Type */ {
-  lowered final self::TypeET /* = core::Type */ #this = t;
+static extension-type-member method TypeET|constructor#(core::Type t) → self::TypeET /* erasure=core::Type */ {
+  lowered final self::TypeET /* erasure=core::Type */ #this = t;
   return #this;
 }
-static extension-type-member method TypeET|constructor#_#new#tearOff(core::Type t) → self::TypeET /* = core::Type */
+static extension-type-member method TypeET|constructor#_#new#tearOff(core::Type t) → self::TypeET /* erasure=core::Type */
   return self::TypeET|constructor#(t);
-static extension-type-member method BoolET|constructor#(core::bool b) → self::BoolET /* = core::bool */ {
-  lowered final self::BoolET /* = core::bool */ #this = b;
+static extension-type-member method BoolET|constructor#(core::bool b) → self::BoolET /* erasure=core::bool */ {
+  lowered final self::BoolET /* erasure=core::bool */ #this = b;
   return #this;
 }
-static extension-type-member method BoolET|constructor#_#new#tearOff(core::bool b) → self::BoolET /* = core::bool */
+static extension-type-member method BoolET|constructor#_#new#tearOff(core::bool b) → self::BoolET /* erasure=core::bool */
   return self::BoolET|constructor#(b);
 static method test() → void {
-  self::ET2 /* = self::B */ e2 = self::ET2|constructor#(new self::B::•());
-  self::ET1 /* = self::B */ e1 = e2;
+  self::ET2 /* erasure=self::B */ e2 = self::ET2|constructor#(new self::B::•());
+  self::ET1 /* erasure=self::B */ e1 = e2;
   core::int hc1 = e1.{core::Object::hashCode}{core::int};
-  self::IntET /* = core::int */ hc2 = e2.{self::B::hashCode}{self::IntET /* = core::int */};
+  self::IntET /* erasure=core::int */ hc2 = e2.{self::B::hashCode}{self::IntET /* erasure=core::int */};
   core::Type t1 = e1.{core::Object::runtimeType}{core::Type};
-  self::TypeET /* = core::Type */ t2 = e2.{self::B::runtimeType}{self::TypeET /* = core::Type */};
+  self::TypeET /* erasure=core::Type */ t2 = e2.{self::B::runtimeType}{self::TypeET /* erasure=core::Type */};
   core::bool b1 = e1 =={core::Object::==}{(core::Object) → core::bool} e1;
-  self::BoolET /* = core::bool */ b2 = invalid-expression "pkg/front_end/testcases/extension_types/built_in_types.dart:43:18: Error: A value of type 'bool' can't be assigned to a variable of type 'BoolET'.
+  self::BoolET /* erasure=core::bool */ b2 = invalid-expression "pkg/front_end/testcases/extension_types/built_in_types.dart:43:18: Error: A value of type 'bool' can't be assigned to a variable of type 'BoolET'.
   BoolET b2 = e2 == e2; /* Error */
-                 ^" in (e2 =={self::B::==}{(core::Object?) → self::BoolET /* = core::bool */} e2) as{TypeError,Unchecked} self::BoolET /* = core::bool */;
+                 ^" in (e2 =={self::B::==}{(core::Object?) → self::BoolET /* erasure=core::bool */} e2) as{TypeError,Unchecked} self::BoolET /* erasure=core::bool */;
 }
 
 constants  {

pkg/front_end/testcases/extension_types/built_in_types.dart.weak.expect

@@ -19,13 +19,13 @@ class B extends core::Object implements self::A {
     : super core::Object::•()
     ;
   @#C1
-  get hashCode() → self::IntET /* = core::int */
+  get hashCode() → self::IntET /* erasure=core::int */
     return self::IntET|constructor#(super.{core::Object::hashCode});
   @#C1
-  get runtimeType() → self::TypeET /* = core::Type */
+  get runtimeType() → self::TypeET /* erasure=core::Type */
     return self::TypeET|constructor#(super.{core::Object::runtimeType});
   @#C1
-  operator ==(core::Object? other) → self::BoolET /* = core::bool */
+  operator ==(core::Object? other) → self::BoolET /* erasure=core::bool */
     return self::BoolET|constructor#(other =={core::Object::==}{(core::Object) → core::bool} this);
 }
 extension type ET1(self::B b) implements self::A {
@@ -33,7 +33,7 @@ extension type ET1(self::B b) implements self::A {
   constructor • = self::ET1|constructor#;
   constructor tearoff • = self::ET1|constructor#_#new#tearOff;
 }
-extension type ET2(self::B b) implements self::ET1 /* = self::B */, self::B {
+extension type ET2(self::B b) implements self::ET1 /* erasure=self::B */, self::B {
   abstract extension-type-member representation-field get b() → self::B;
   constructor • = self::ET2|constructor#;
   constructor tearoff • = self::ET2|constructor#_#new#tearOff;
@@ -53,47 +53,47 @@ extension type BoolET(core::bool b) implements core::bool {
   constructor • = self::BoolET|constructor#;
   constructor tearoff • = self::BoolET|constructor#_#new#tearOff;
 }
-static extension-type-member method ET1|constructor#(self::B b) → self::ET1 /* = self::B */ {
-  lowered final self::ET1 /* = self::B */ #this = b;
+static extension-type-member method ET1|constructor#(self::B b) → self::ET1 /* erasure=self::B */ {
+  lowered final self::ET1 /* erasure=self::B */ #this = b;
   return #this;
 }
-static extension-type-member method ET1|constructor#_#new#tearOff(self::B b) → self::ET1 /* = self::B */
+static extension-type-member method ET1|constructor#_#new#tearOff(self::B b) → self::ET1 /* erasure=self::B */
   return self::ET1|constructor#(b);
-static extension-type-member method ET2|constructor#(self::B b) → self::ET2 /* = self::B */ {
-  lowered final self::ET2 /* = self::B */ #this = b;
+static extension-type-member method ET2|constructor#(self::B b) → self::ET2 /* erasure=self::B */ {
+  lowered final self::ET2 /* erasure=self::B */ #this = b;
   return #this;
 }
-static extension-type-member method ET2|constructor#_#new#tearOff(self::B b) → self::ET2 /* = self::B */
+static extension-type-member method ET2|constructor#_#new#tearOff(self::B b) → self::ET2 /* erasure=self::B */
   return self::ET2|constructor#(b);
-static extension-type-member method IntET|constructor#(core::int i) → self::IntET /* = core::int */ {
-  lowered final self::IntET /* = core::int */ #this = i;
+static extension-type-member method IntET|constructor#(core::int i) → self::IntET /* erasure=core::int */ {
+  lowered final self::IntET /* erasure=core::int */ #this = i;
   return #this;
 }
-static extension-type-member method IntET|constructor#_#new#tearOff(core::int i) → self::IntET /* = core::int */
+static extension-type-member method IntET|constructor#_#new#tearOff(core::int i) → self::IntET /* erasure=core::int */
   return self::IntET|constructor#(i);
-static extension-type-member method TypeET|constructor#(core::Type t) → self::TypeET /* = core::Type */ {
-  lowered final self::TypeET /* = core::Type */ #this = t;
+static extension-type-member method TypeET|constructor#(core::Type t) → self::TypeET /* erasure=core::Type */ {
+  lowered final self::TypeET /* erasure=core::Type */ #this = t;
   return #this;
 }
-static extension-type-member method TypeET|constructor#_#new#tearOff(core::Type t) → self::TypeET /* = core::Type */
+static extension-type-member method TypeET|constructor#_#new#tearOff(core::Type t) → self::TypeET /* erasure=core::Type */
   return self::TypeET|constructor#(t);
-static extension-type-member method BoolET|constructor#(core::bool b) → self::BoolET /* = core::bool */ {
-  lowered final self::BoolET /* = core::bool */ #this = b;
+static extension-type-member method BoolET|constructor#(core::bool b) → self::BoolET /* erasure=core::bool */ {
+  lowered final self::BoolET /* erasure=core::bool */ #this = b;
   return #this;
 }
-static extension-type-member method BoolET|constructor#_#new#tearOff(core::bool b) → self::BoolET /* = core::bool */
+static extension-type-member method BoolET|constructor#_#new#tearOff(core::bool b) → self::BoolET /* erasure=core::bool */
   return self::BoolET|constructor#(b);
 static method test() → void {
-  self::ET2 /* = self::B */ e2 = self::ET2|constructor#(new self::B::•());
-  self::ET1 /* = self::B */ e1 = e2;
+  self::ET2 /* erasure=self::B */ e2 = self::ET2|constructor#(new self::B::•());
+  self::ET1 /* erasure=self::B */ e1 = e2;
   core::int hc1 = e1.{core::Object::hashCode}{core::int};
-  self::IntET /* = core::int */ hc2 = e2.{self::B::hashCode}{self::IntET /* = core::int */};
+  self::IntET /* erasure=core::int */ hc2 = e2.{self::B::hashCode}{self::IntET /* erasure=core::int */};
   core::Type t1 = e1.{core::Object::runtimeType}{core::Type};
-  self::TypeET /* = core::Type */ t2 = e2.{self::B::runtimeType}{self::TypeET /* = core::Type */};
+  self::TypeET /* erasure=core::Type */ t2 = e2.{self::B::runtimeType}{self::TypeET /* erasure=core::Type */};
   core::bool b1 = e1 =={core::Object::==}{(core::Object) → core::bool} e1;
-  self::BoolET /* = core::bool */ b2 = invalid-expression "pkg/front_end/testcases/extension_types/built_in_types.dart:43:18: Error: A value of type 'bool' can't be assigned to a variable of type 'BoolET'.
+  self::BoolET /* erasure=core::bool */ b2 = invalid-expression "pkg/front_end/testcases/extension_types/built_in_types.dart:43:18: Error: A value of type 'bool' can't be assigned to a variable of type 'BoolET'.
   BoolET b2 = e2 == e2; /* Error */
-                 ^" in (e2 =={self::B::==}{(core::Object?) → self::BoolET /* = core::bool */} e2) as{TypeError} self::BoolET /* = core::bool */;
+                 ^" in (e2 =={self::B::==}{(core::Object?) → self::BoolET /* erasure=core::bool */} e2) as{TypeError} self::BoolET /* erasure=core::bool */;
 }
 
 constants  {

pkg/front_end/testcases/extension_types/built_in_types.dart.weak.modular.expect

@@ -19,13 +19,13 @@ class B extends core::Object implements self::A {
     : super core::Object::•()
     ;
   @#C1
-  get hashCode() → self::IntET /* = core::int */
+  get hashCode() → self::IntET /* erasure=core::int */
     return self::IntET|constructor#(super.{core::Object::hashCode});
   @#C1
-  get runtimeType() → self::TypeET /* = core::Type */
+  get runtimeType() → self::TypeET /* erasure=core::Type */
     return self::TypeET|constructor#(super.{core::Object::runtimeType});
   @#C1
-  operator ==(core::Object? other) → self::BoolET /* = core::bool */
+  operator ==(core::Object? other) → self::BoolET /* erasure=core::bool */
     return self::BoolET|constructor#(other =={core::Object::==}{(core::Object) → core::bool} this);
 }
 extension type ET1(self::B b) implements self::A {
@@ -33,7 +33,7 @@ extension type ET1(self::B b) implements self::A {
   constructor • = self::ET1|constructor#;
   constructor tearoff • = self::ET1|constructor#_#new#tearOff;
 }
-extension type ET2(self::B b) implements self::ET1 /* = self::B */, self::B {
+extension type ET2(self::B b) implements self::ET1 /* erasure=self::B */, self::B {
   abstract extension-type-member representation-field get b() → self::B;
   constructor • = self::ET2|constructor#;
   constructor tearoff • = self::ET2|constructor#_#new#tearOff;
@@ -53,47 +53,47 @@ extension type BoolET(core::bool b) implements core::bool {
   constructor • = self::BoolET|constructor#;
   constructor tearoff • = self::BoolET|constructor#_#new#tearOff;
 }
-static extension-type-member method ET1|constructor#(self::B b) → self::ET1 /* = self::B */ {
-  lowered final self::ET1 /* = self::B */ #this = b;
+static extension-type-member method ET1|constructor#(self::B b) → self::ET1 /* erasure=self::B */ {
+  lowered final self::ET1 /* erasure=self::B */ #this = b;
   return #this;
 }
-static extension-type-member method ET1|constructor#_#new#tearOff(self::B b) → self::ET1 /* = self::B */
+static extension-type-member method ET1|constructor#_#new#tearOff(self::B b) → self::ET1 /* erasure=self::B */
   return self::ET1|constructor#(b);
-static extension-type-member method ET2|constructor#(self::B b) → self::ET2 /* = self::B */ {
-  lowered final self::ET2 /* = self::B */ #this = b;
+static extension-type-member method ET2|constructor#(self::B b) → self::ET2 /* erasure=self::B */ {
+  lowered final self::ET2 /* erasure=self::B */ #this = b;
   return #this;
 }
-static extension-type-member method ET2|constructor#_#new#tearOff(self::B b) → self::ET2 /* = self::B */
+static extension-type-member method ET2|constructor#_#new#tearOff(self::B b) → self::ET2 /* erasure=self::B */
   return self::ET2|constructor#(b);
-static extension-type-member method IntET|constructor#(core::int i) → self::IntET /* = core::int */ {
-  lowered final self::IntET /* = core::int */ #this = i;
+static extension-type-member method IntET|constructor#(core::int i) → self::IntET /* erasure=core::int */ {
+  lowered final self::IntET /* erasure=core::int */ #this = i;
   return #this;
 }
-static extension-type-member method IntET|constructor#_#new#tearOff(core::int i) → self::IntET /* = core::int */
+static extension-type-member method IntET|constructor#_#new#tearOff(core::int i) → self::IntET /* erasure=core::int */
   return self::IntET|constructor#(i);
-static extension-type-member method TypeET|constructor#(core::Type t) → self::TypeET /* = core::Type */ {
-  lowered final self::TypeET /* = core::Type */ #this = t;
+static extension-type-member method TypeET|constructor#(core::Type t) → self::TypeET /* erasure=core::Type */ {
+  lowered final self::TypeET /* erasure=core::Type */ #this = t;
   return #this;
 }
-static extension-type-member method TypeET|constructor#_#new#tearOff(core::Type t) → self::TypeET /* = core::Type */
+static extension-type-member method TypeET|constructor#_#new#tearOff(core::Type t) → self::TypeET /* erasure=core::Type */
   return self::TypeET|constructor#(t);
-static extension-type-member method BoolET|constructor#(core::bool b) → self::BoolET /* = core::bool */ {
-  lowered final self::BoolET /* = core::bool */ #this = b;
+static extension-type-member method BoolET|constructor#(core::bool b) → self::BoolET /* erasure=core::bool */ {
+  lowered final self::BoolET /* erasure=core::bool */ #this = b;
   return #this;
 }
-static extension-type-member method BoolET|constructor#_#new#tearOff(core::bool b) → self::BoolET /* = core::bool */
+static extension-type-member method BoolET|constructor#_#new#tearOff(core::bool b) → self::BoolET /* erasure=core::bool */
   return self::BoolET|constructor#(b);
 static method test() → void {
-  self::ET2 /* = self::B */ e2 = self::ET2|constructor#(new self::B::•());
-  self::ET1 /* = self::B */ e1 = e2;
+  self::ET2 /* erasure=self::B */ e2 = self::ET2|constructor#(new self::B::•());
+  self::ET1 /* erasure=self::B */ e1 = e2;
   core::int hc1 = e1.{core::Object::hashCode}{core::int};
-  self::IntET /* = core::int */ hc2 = e2.{self::B::hashCode}{self::IntET /* = core::int */};
+  self::IntET /* erasure=core::int */ hc2 = e2.{self::B::hashCode}{self::IntET /* erasure=core::int */};
   core::Type t1 = e1.{core::Object::runtimeType}{core::Type};
-  self::TypeET /* = core::Type */ t2 = e2.{self::B::runtimeType}{self::TypeET /* = core::Type */};
+  self::TypeET /* erasure=core::Type */ t2 = e2.{self::B::runtimeType}{self::TypeET /* erasure=core::Type */};
   core::bool b1 = e1 =={core::Object::==}{(core::Object) → core::bool} e1;
-  self::BoolET /* = core::bool */ b2 = invalid-expression "pkg/front_end/testcases/extension_types/built_in_types.dart:43:18: Error: A value of type 'bool' can't be assigned to a variable of type 'BoolET'.
+  self::BoolET /* erasure=core::bool */ b2 = invalid-expression "pkg/front_end/testcases/extension_types/built_in_types.dart:43:18: Error: A value of type 'bool' can't be assigned to a variable of type 'BoolET'.
   BoolET b2 = e2 == e2; /* Error */
-                 ^" in (e2 =={self::B::==}{(core::Object?) → self::BoolET /* = core::bool */} e2) as{TypeError} self::BoolET /* = core::bool */;
+                 ^" in (e2 =={self::B::==}{(core::Object?) → self::BoolET /* erasure=core::bool */} e2) as{TypeError} self::BoolET /* erasure=core::bool */;
 }
 
 constants  {

pkg/front_end/testcases/extension_types/built_in_types.dart.weak.outline.expect

@@ -10,13 +10,13 @@ class B extends core::Object implements self::A {
   synthetic constructor •() → self::B
     ;
   @core::override
-  get hashCode() → self::IntET /* = core::int */
+  get hashCode() → self::IntET /* erasure=core::int */
     ;
   @core::override
-  get runtimeType() → self::TypeET /* = core::Type */
+  get runtimeType() → self::TypeET /* erasure=core::Type */
     ;
   @core::override
-  operator ==(core::Object? other) → self::BoolET /* = core::bool */
+  operator ==(core::Object? other) → self::BoolET /* erasure=core::bool */
     ;
 }
 extension type ET1(self::B b) implements self::A {
@@ -24,7 +24,7 @@ extension type ET1(self::B b) implements self::A {
   constructor • = self::ET1|constructor#;
   constructor tearoff • = self::ET1|constructor#_#new#tearOff;
 }
-extension type ET2(self::B b) implements self::ET1 /* = self::B */, self::B {
+extension type ET2(self::B b) implements self::ET1 /* erasure=self::B */, self::B {
   abstract extension-type-member representation-field get b() → self::B;
   constructor • = self::ET2|constructor#;
   constructor tearoff • = self::ET2|constructor#_#new#tearOff;
@@ -44,25 +44,25 @@ extension type BoolET(core::bool b) implements core::bool {
   constructor • = self::BoolET|constructor#;
   constructor tearoff • = self::BoolET|constructor#_#new#tearOff;
 }
-static extension-type-member method ET1|constructor#(self::B b) → self::ET1 /* = self::B */
+static extension-type-member method ET1|constructor#(self::B b) → self::ET1 /* erasure=self::B */
   ;
-static extension-type-member method ET1|constructor#_#new#tearOff(self::B b) → self::ET1 /* = self::B */
+static extension-type-member method ET1|constructor#_#new#tearOff(self::B b) → self::ET1 /* erasure=self::B */
   return self::ET1|constructor#(b);
-static extension-type-member method ET2|constructor#(self::B b) → self::ET2 /* = self::B */
+static extension-type-member method ET2|constructor#(self::B b) → self::ET2 /* erasure=self::B */
   ;
-static extension-type-member method ET2|constructor#_#new#tearOff(self::B b) → self::ET2 /* = self::B */
+static extension-type-member method ET2|constructor#_#new#tearOff(self::B b) → self::ET2 /* erasure=self::B */
   return self::ET2|constructor#(b);
-static extension-type-member method IntET|constructor#(core::int i) → self::IntET /* = core::int */
+static extension-type-member method IntET|constructor#(core::int i) → self::IntET /* erasure=core::int */
   ;
-static extension-type-member method IntET|constructor#_#new#tearOff(core::int i) → self::IntET /* = core::int */
+static extension-type-member method IntET|constructor#_#new#tearOff(core::int i) → self::IntET /* erasure=core::int */
   return self::IntET|constructor#(i);
-static extension-type-member method TypeET|constructor#(core::Type t) → self::TypeET /* = core::Type */
+static extension-type-member method TypeET|constructor#(core::Type t) → self::TypeET /* erasure=core::Type */
   ;
-static extension-type-member method TypeET|constructor#_#new#tearOff(core::Type t) → self::TypeET /* = core::Type */
+static extension-type-member method TypeET|constructor#_#new#tearOff(core::Type t) → self::TypeET /* erasure=core::Type */
   return self::TypeET|constructor#(t);
-static extension-type-member method BoolET|constructor#(core::bool b) → self::BoolET /* = core::bool */
+static extension-type-member method BoolET|constructor#(core::bool b) → self::BoolET /* erasure=core::bool */
   ;
-static extension-type-member method BoolET|constructor#_#new#tearOff(core::bool b) → self::BoolET /* = core::bool */
+static extension-type-member method BoolET|constructor#_#new#tearOff(core::bool b) → self::BoolET /* erasure=core::bool */
   return self::BoolET|constructor#(b);
 static method test() → void
   ;

pkg/front_end/testcases/extension_types/built_in_types.dart.weak.transformed.expect

@@ -19,13 +19,13 @@ class B extends core::Object implements self::A {
     : super core::Object::•()
     ;
   @#C1
-  get hashCode() → self::IntET /* = core::int */
+  get hashCode() → self::IntET /* erasure=core::int */
     return self::IntET|constructor#(super.{core::Object::hashCode});
   @#C1
-  get runtimeType() → self::TypeET /* = core::Type */
+  get runtimeType() → self::TypeET /* erasure=core::Type */
     return self::TypeET|constructor#(super.{core::Object::runtimeType});
   @#C1
-  operator ==(core::Object? other) → self::BoolET /* = core::bool */
+  operator ==(core::Object? other) → self::BoolET /* erasure=core::bool */
     return self::BoolET|constructor#(other =={core::Object::==}{(core::Object) → core::bool} this);
 }
 extension type ET1(self::B b) implements self::A {
@@ -33,7 +33,7 @@ extension type ET1(self::B b) implements self::A {
   constructor • = self::ET1|constructor#;
   constructor tearoff • = self::ET1|constructor#_#new#tearOff;
 }
-extension type ET2(self::B b) implements self::ET1 /* = self::B */, self::B {
+extension type ET2(self::B b) implements self::ET1 /* erasure=self::B */, self::B {
   abstract extension-type-member representation-field get b() → self::B;
   constructor • = self::ET2|constructor#;
   constructor tearoff • = self::ET2|constructor#_#new#tearOff;
@@ -53,47 +53,47 @@ extension type BoolET(core::bool b) implements core::bool {
   constructor • = self::BoolET|constructor#;
   constructor tearoff • = self::BoolET|constructor#_#new#tearOff;
 }
-static extension-type-member method ET1|constructor#(self::B b) → self::ET1 /* = self::B */ {
-  lowered final self::ET1 /* = self::B */ #this = b;
+static extension-type-member method ET1|constructor#(self::B b) → self::ET1 /* erasure=self::B */ {
+  lowered final self::ET1 /* erasure=self::B */ #this = b;
   return #this;
 }
-static extension-type-member method ET1|constructor#_#new#tearOff(self::B b) → self::ET1 /* = self::B */
+static extension-type-member method ET1|constructor#_#new#tearOff(self::B b) → self::ET1 /* erasure=self::B */
   return self::ET1|constructor#(b);
-static extension-type-member method ET2|constructor#(self::B b) → self::ET2 /* = self::B */ {
-  lowered final self::ET2 /* = self::B */ #this = b;
+static extension-type-member method ET2|constructor#(self::B b) → self::ET2 /* erasure=self::B */ {
+  lowered final self::ET2 /* erasure=self::B */ #this = b;
   return #this;
 }
-static extension-type-member method ET2|constructor#_#new#tearOff(self::B b) → self::ET2 /* = self::B */
+static extension-type-member method ET2|constructor#_#new#tearOff(self::B b) → self::ET2 /* erasure=self::B */
   return self::ET2|constructor#(b);
-static extension-type-member method IntET|constructor#(core::int i) → self::IntET /* = core::int */ {
-  lowered final self::IntET /* = core::int */ #this = i;
+static extension-type-member method IntET|constructor#(core::int i) → self::IntET /* erasure=core::int */ {
+  lowered final self::IntET /* erasure=core::int */ #this = i;
   return #this;
 }
-static extension-type-member method IntET|constructor#_#new#tearOff(core::int i) → self::IntET /* = core::int */
+static extension-type-member method IntET|constructor#_#new#tearOff(core::int i) → self::IntET /* erasure=core::int */
   return self::IntET|constructor#(i);
-static extension-type-member method TypeET|constructor#(core::Type t) → self::TypeET /* = core::Type */ {
-  lowered final self::TypeET /* = core::Type */ #this = t;
+static extension-type-member method TypeET|constructor#(core::Type t) → self::TypeET /* erasure=core::Type */ {
+  lowered final self::TypeET /* erasure=core::Type */ #this = t;
   return #this;
 }
-static extension-type-member method TypeET|constructor#_#new#tearOff(core::Type t) → self::TypeET /* = core::Type */
+static extension-type-member method TypeET|constructor#_#new#tearOff(core::Type t) → self::TypeET /* erasure=core::Type */
   return self::TypeET|constructor#(t);
-static extension-type-member method BoolET|constructor#(core::bool b) → self::BoolET /* = core::bool */ {
-  lowered final self::BoolET /* = core::bool */ #this = b;
+static extension-type-member method BoolET|constructor#(core::bool b) → self::BoolET /* erasure=core::bool */ {
+  lowered final self::BoolET /* erasure=core::bool */ #this = b;
   return #this;
 }
-static extension-type-member method BoolET|constructor#_#new#tearOff(core::bool b) → self::BoolET /* = core::bool */
+static extension-type-member method BoolET|constructor#_#new#tearOff(core::bool b) → self::BoolET /* erasure=core::bool */
   return self::BoolET|constructor#(b);
 static method test() → void {
-  self::ET2 /* = self::B */ e2 = self::ET2|constructor#(new self::B::•());
-  self::ET1 /* = self::B */ e1 = e2;
+  self::ET2 /* erasure=self::B */ e2 = self::ET2|constructor#(new self::B::•());
+  self::ET1 /* erasure=self::B */ e1 = e2;
   core::int hc1 = e1.{core::Object::hashCode}{core::int};
-  self::IntET /* = core::int */ hc2 = e2.{self::B::hashCode}{self::IntET /* = core::int */};
+  self::IntET /* erasure=core::int */ hc2 = e2.{self::B::hashCode}{self::IntET /* erasure=core::int */};
   core::Type t1 = e1.{core::Object::runtimeType}{core::Type};
-  self::TypeET /* = core::Type */ t2 = e2.{self::B::runtimeType}{self::TypeET /* = core::Type */};
+  self::TypeET /* erasure=core::Type */ t2 = e2.{self::B::runtimeType}{self::TypeET /* erasure=core::Type */};
   core::bool b1 = e1 =={core::Object::==}{(core::Object) → core::bool} e1;
-  self::BoolET /* = core::bool */ b2 = invalid-expression "pkg/front_end/testcases/extension_types/built_in_types.dart:43:18: Error: A value of type 'bool' can't be assigned to a variable of type 'BoolET'.
+  self::BoolET /* erasure=core::bool */ b2 = invalid-expression "pkg/front_end/testcases/extension_types/built_in_types.dart:43:18: Error: A value of type 'bool' can't be assigned to a variable of type 'BoolET'.
   BoolET b2 = e2 == e2; /* Error */
-                 ^" in (e2 =={self::B::==}{(core::Object?) → self::BoolET /* = core::bool */} e2) as{TypeError,Unchecked} self::BoolET /* = core::bool */;
+                 ^" in (e2 =={self::B::==}{(core::Object?) → self::BoolET /* erasure=core::bool */} e2) as{TypeError,Unchecked} self::BoolET /* erasure=core::bool */;
 }
 
 constants  {

pkg/front_end/testcases/extension_types/call.dart.strong.expect

@@ -19,13 +19,13 @@ extension type E(<T extends core::Object? = dynamic>(T%) → T% call) {
   constructor • = self::E|constructor#;
   constructor tearoff • = self::E|constructor#_#new#tearOff;
 }
-static extension-type-member method E|constructor#(<T extends core::Object? = dynamic>(T%) → T% call) → self::E /* = <T extends core::Object? = dynamic>(T%) → T% */ {
-  lowered final self::E /* = <T extends core::Object? = dynamic>(T%) → T% */ #this = call;
+static extension-type-member method E|constructor#(<T extends core::Object? = dynamic>(T%) → T% call) → self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */ {
+  lowered final self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */ #this = call;
   return #this;
 }
-static extension-type-member method E|constructor#_#new#tearOff(<T extends core::Object? = dynamic>(T%) → T% call) → self::E /* = <T extends core::Object? = dynamic>(T%) → T% */
+static extension-type-member method E|constructor#_#new#tearOff(<T extends core::Object? = dynamic>(T%) → T% call) → self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */
   return self::E|constructor#(call);
-static method method(self::E /* = <T extends core::Object? = dynamic>(T%) → T% */ e) → dynamic {
+static method method(self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */ e) → dynamic {
   (core::int) → core::int a = invalid-expression "pkg/front_end/testcases/extension_types/call.dart:8:26: Error: The static type of the explicit instantiation operand must be a generic function type but is 'E'.
 Try changing the operand or remove the type arguments.
   int Function(int) a = e<int>; // Error

pkg/front_end/testcases/extension_types/call.dart.strong.transformed.expect

@@ -19,13 +19,13 @@ extension type E(<T extends core::Object? = dynamic>(T%) → T% call) {
   constructor • = self::E|constructor#;
   constructor tearoff • = self::E|constructor#_#new#tearOff;
 }
-static extension-type-member method E|constructor#(<T extends core::Object? = dynamic>(T%) → T% call) → self::E /* = <T extends core::Object? = dynamic>(T%) → T% */ {
-  lowered final self::E /* = <T extends core::Object? = dynamic>(T%) → T% */ #this = call;
+static extension-type-member method E|constructor#(<T extends core::Object? = dynamic>(T%) → T% call) → self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */ {
+  lowered final self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */ #this = call;
   return #this;
 }
-static extension-type-member method E|constructor#_#new#tearOff(<T extends core::Object? = dynamic>(T%) → T% call) → self::E /* = <T extends core::Object? = dynamic>(T%) → T% */
+static extension-type-member method E|constructor#_#new#tearOff(<T extends core::Object? = dynamic>(T%) → T% call) → self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */
   return self::E|constructor#(call);
-static method method(self::E /* = <T extends core::Object? = dynamic>(T%) → T% */ e) → dynamic {
+static method method(self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */ e) → dynamic {
   (core::int) → core::int a = invalid-expression "pkg/front_end/testcases/extension_types/call.dart:8:26: Error: The static type of the explicit instantiation operand must be a generic function type but is 'E'.
 Try changing the operand or remove the type arguments.
   int Function(int) a = e<int>; // Error

pkg/front_end/testcases/extension_types/call.dart.weak.expect

@@ -19,13 +19,13 @@ extension type E(<T extends core::Object? = dynamic>(T%) → T% call) {
   constructor • = self::E|constructor#;
   constructor tearoff • = self::E|constructor#_#new#tearOff;
 }
-static extension-type-member method E|constructor#(<T extends core::Object? = dynamic>(T%) → T% call) → self::E /* = <T extends core::Object? = dynamic>(T%) → T% */ {
-  lowered final self::E /* = <T extends core::Object? = dynamic>(T%) → T% */ #this = call;
+static extension-type-member method E|constructor#(<T extends core::Object? = dynamic>(T%) → T% call) → self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */ {
+  lowered final self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */ #this = call;
   return #this;
 }
-static extension-type-member method E|constructor#_#new#tearOff(<T extends core::Object? = dynamic>(T%) → T% call) → self::E /* = <T extends core::Object? = dynamic>(T%) → T% */
+static extension-type-member method E|constructor#_#new#tearOff(<T extends core::Object? = dynamic>(T%) → T% call) → self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */
   return self::E|constructor#(call);
-static method method(self::E /* = <T extends core::Object? = dynamic>(T%) → T% */ e) → dynamic {
+static method method(self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */ e) → dynamic {
   (core::int) → core::int a = invalid-expression "pkg/front_end/testcases/extension_types/call.dart:8:26: Error: The static type of the explicit instantiation operand must be a generic function type but is 'E'.
 Try changing the operand or remove the type arguments.
   int Function(int) a = e<int>; // Error

pkg/front_end/testcases/extension_types/call.dart.weak.modular.expect

@@ -19,13 +19,13 @@ extension type E(<T extends core::Object? = dynamic>(T%) → T% call) {
   constructor • = self::E|constructor#;
   constructor tearoff • = self::E|constructor#_#new#tearOff;
 }
-static extension-type-member method E|constructor#(<T extends core::Object? = dynamic>(T%) → T% call) → self::E /* = <T extends core::Object? = dynamic>(T%) → T% */ {
-  lowered final self::E /* = <T extends core::Object? = dynamic>(T%) → T% */ #this = call;
+static extension-type-member method E|constructor#(<T extends core::Object? = dynamic>(T%) → T% call) → self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */ {
+  lowered final self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */ #this = call;
   return #this;
 }
-static extension-type-member method E|constructor#_#new#tearOff(<T extends core::Object? = dynamic>(T%) → T% call) → self::E /* = <T extends core::Object? = dynamic>(T%) → T% */
+static extension-type-member method E|constructor#_#new#tearOff(<T extends core::Object? = dynamic>(T%) → T% call) → self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */
   return self::E|constructor#(call);
-static method method(self::E /* = <T extends core::Object? = dynamic>(T%) → T% */ e) → dynamic {
+static method method(self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */ e) → dynamic {
   (core::int) → core::int a = invalid-expression "pkg/front_end/testcases/extension_types/call.dart:8:26: Error: The static type of the explicit instantiation operand must be a generic function type but is 'E'.
 Try changing the operand or remove the type arguments.
   int Function(int) a = e<int>; // Error

pkg/front_end/testcases/extension_types/call.dart.weak.outline.expect

@@ -7,9 +7,9 @@ extension type E(<T extends core::Object? = dynamic>(T%) → T% call) {
   constructor • = self::E|constructor#;
   constructor tearoff • = self::E|constructor#_#new#tearOff;
 }
-static extension-type-member method E|constructor#(<T extends core::Object? = dynamic>(T%) → T% call) → self::E /* = <T extends core::Object? = dynamic>(T%) → T% */
+static extension-type-member method E|constructor#(<T extends core::Object? = dynamic>(T%) → T% call) → self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */
   ;
-static extension-type-member method E|constructor#_#new#tearOff(<T extends core::Object? = dynamic>(T%) → T% call) → self::E /* = <T extends core::Object? = dynamic>(T%) → T% */
+static extension-type-member method E|constructor#_#new#tearOff(<T extends core::Object? = dynamic>(T%) → T% call) → self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */
   return self::E|constructor#(call);
-static method method(self::E /* = <T extends core::Object? = dynamic>(T%) → T% */ e) → dynamic
+static method method(self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */ e) → dynamic
   ;

pkg/front_end/testcases/extension_types/call.dart.weak.transformed.expect

@@ -19,13 +19,13 @@ extension type E(<T extends core::Object? = dynamic>(T%) → T% call) {
   constructor • = self::E|constructor#;
   constructor tearoff • = self::E|constructor#_#new#tearOff;
 }
-static extension-type-member method E|constructor#(<T extends core::Object? = dynamic>(T%) → T% call) → self::E /* = <T extends core::Object? = dynamic>(T%) → T% */ {
-  lowered final self::E /* = <T extends core::Object? = dynamic>(T%) → T% */ #this = call;
+static extension-type-member method E|constructor#(<T extends core::Object? = dynamic>(T%) → T% call) → self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */ {
+  lowered final self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */ #this = call;
   return #this;
 }
-static extension-type-member method E|constructor#_#new#tearOff(<T extends core::Object? = dynamic>(T%) → T% call) → self::E /* = <T extends core::Object? = dynamic>(T%) → T% */
+static extension-type-member method E|constructor#_#new#tearOff(<T extends core::Object? = dynamic>(T%) → T% call) → self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */
   return self::E|constructor#(call);
-static method method(self::E /* = <T extends core::Object? = dynamic>(T%) → T% */ e) → dynamic {
+static method method(self::E% /* erasure=<T extends core::Object? = dynamic>(T%) → T%, declared=! */ e) → dynamic {
   (core::int) → core::int a = invalid-expression "pkg/front_end/testcases/extension_types/call.dart:8:26: Error: The static type of the explicit instantiation operand must be a generic function type but is 'E'.
 Try changing the operand or remove the type arguments.
   int Function(int) a = e<int>; // Error