[wildcard-variables] Add async rethrow test and wildcard patterns.

Fix follow up comments with an async rethrow test.
Tests that wildcard patterns still work while mixed with wildcard variables.

Bug: https://github.com/dart-lang/sdk/issues/55652
Change-Id: If6ab4de68ff27ad51215427a7183f1aed7229947
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/367501
Reviewed-by: Erik Ernst <eernst@google.com>
Commit-Queue: Kallen Tu <kallentu@google.com>

tests/language/wildcard_variables/multiple/local_declaration_catch_rethrow_async_test.dart

@@ -0,0 +1,76 @@
+// Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Tests multiple catch clause wildcard variable declarations with rethrow and
+// awaits.
+
+// SharedOptions=--enable-experiment=wildcard-variables
+
+import 'package:expect/expect.dart';
+import "package:async_helper/async_helper.dart";
+
+void main() async {
+  asyncStart();
+  test().then((_) => asyncEnd());
+}
+
+Future<void> test() async {
+  var tryValue = Future<int>.value(1);
+  var catchValue = Future<int>.value(1);
+
+  var error = StateError("State bad!");
+  var stack = StackTrace.fromString("My stack trace");
+  var caught = false;
+
+  // Multiple wildcard catch clause variables.
+  try {
+    try {
+      await tryValue;
+      Error.throwWithStackTrace(error, stack);
+    } on StateError catch (_, _) {
+      await catchValue;
+      caught = true;
+      rethrow;
+    }
+  } on StateError catch (e, s) {
+    Expect.isTrue(caught);
+    Expect.identical(error, e);
+    Expect.equals(stack.toString(), s.toString());
+    Expect.equals(stack.toString(), e.stackTrace.toString());
+  }
+
+  // Single wildcard catch clause variable.
+  try {
+    try {
+      await tryValue;
+      Error.throwWithStackTrace(error, stack);
+    } on StateError catch (_) {
+      await catchValue;
+      caught = true;
+      rethrow;
+    }
+  } on StateError catch (e, s) {
+    Expect.isTrue(caught);
+    Expect.identical(error, e);
+    Expect.equals(stack.toString(), s.toString());
+    Expect.equals(stack.toString(), e.stackTrace.toString());
+  }
+
+  try {
+    try {
+      await tryValue;
+      Error.throwWithStackTrace(error, stack);
+    } on StateError catch (_, s) {
+      await catchValue;
+      Expect.equals(stack.toString(), s.toString());
+      caught = true;
+      rethrow;
+    }
+  } on StateError catch (e, s) {
+    Expect.isTrue(caught);
+    Expect.identical(error, e);
+    Expect.equals(stack.toString(), s.toString());
+    Expect.equals(stack.toString(), e.stackTrace.toString());
+  }
+}

tests/language/wildcard_variables/multiple/local_declaration_for_loop_test.dart

@@ -6,6 +6,8 @@
 
 // SharedOptions=--enable-experiment=wildcard-variables
 
+import 'package:async_helper/async_helper.dart';
+
 void main() async {
   // Multiple for-loop wildcard declarations.
   for (int _ = 0, _ = 2;;) {
@@ -15,6 +17,11 @@ void main() async {
   var list = [];
   for (var _ in list) {}
 
+  asyncStart();
+  streamTest().then((_) => asyncEnd());
+}
+
+Future streamTest() async {
   var stream = Stream.empty();
   await for (var _ in stream) {}
 }

tests/language/wildcard_variables/non_binding/class_members_test.dart

@@ -22,13 +22,14 @@ class InstanceMember {
     int _ = 2;
     const _ = 2;
     int _() => 2;
-    _ = 3;
-    Expect.equals(3, _);
+    var (_, _) = (3, '4');
+    Expect.equals(2, _);
 
-    int _() => 2;
+    _ = 4;
+    Expect.equals(4, _);
 
     int foo<_>([int _ = 5]) => _;
-    Expect.equals(3, foo());
+    Expect.equals(4, foo());
   }
 }
 
@@ -41,10 +42,13 @@ class StaticMember {
     const _ = 2;
     const _ = _ - 1;
     int _() => 2;
-    _ = 3;
-    Expect.equals(3, _);
+    var (_, _) = (3, '4');
+    Expect.equals(2, _);
+
+    _ = 4;
+    Expect.equals(4, _);
 
     int foo<_>([int _ = _ + 1]) => _;
-    Expect.equals(3, foo());
+    Expect.equals(4, foo());
   }
 }

tests/language/wildcard_variables/non_binding/top_level_function_test.dart

@@ -15,6 +15,8 @@ void main() {
   int _ = 1;
   const _ = 1;
   int _() => 1;
+  var (_, _) = (3, '4');
+
   Expect.equals(2, _(1));
 }
 
@@ -23,6 +25,8 @@ class Clas<_> {
     int _ = 1;
     const _ = 1;
     int _() => 1;
+    var (_, _) = (3, '4');
+
     Expect.equals(2, _(1));
   }
 }

tests/language/wildcard_variables/non_binding/top_level_typedef_test.dart

@@ -30,7 +30,11 @@ class CConst {
     final _ = _;
     const _ = _;
     int _() => 1;
+    var (_, _) = (3, '4');
+    Expect.equals(42, _);
+
     int foo<_>([String _ = "$_"]) => _;
-    _ = foo();
+    foo();
+    Expect.equals(42, _);
   }
 }

tests/language/wildcard_variables/non_binding/top_level_variable_test.dart

@@ -15,16 +15,21 @@ void main() {
   Clas().member();
 
   int _ = _;
-  int _ = 2;
-  _ = 3;
-  Expect.equals(3, _);
+  int _ = 3;
+  var (_, _) = (3, '4');
+  Expect.equals(2, _);
+
+  _ = 4;
+  Expect.equals(4, _);
 }
 
 class Clas<_> {
   void member<_>() {
     int _ = _;
-    int _ = 2;
+    int _ = 3;
+    var (_, _) = (3, '4');
     Expect.equals(2, _);
+
     _ = 4;
     Expect.equals(4, _);