Fixes #2574. Add more augmenting types tests

LanguageFeatures/Augmentation-libraries/augmenting_types_A01_t03.dart

@@ -0,0 +1,37 @@
+// 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.
+
+/// @assertion It is a compile-time error if:
+///
+/// - The augmenting type and corresponding type are not the same kind: class,
+///   mixin, enum, or extension. You can't augment a class with a mixin, etc.
+///
+/// @description Checks that it is not an error if an augmenting type and the
+/// corresponding type are the same kind. Test type aliases
+/// @author sgrekhov22@gmail.com
+
+// SharedOptions=--enable-experiment=macros
+
+import '../../Utils/expect.dart';
+import augment 'augmenting_types_A01_t03_lib.dart';
+
+class C {}
+
+mixin M {}
+
+enum E {e1;}
+
+typedef CAlias = C;
+typedef MAlias = M;
+typedef EAlias = E;
+
+class MA = Object with M;
+
+main() {
+  Expect.equals("C", C().foo());
+  Expect.equals("C", CAlias().foo());
+  Expect.equals("M", MA().foo());
+  Expect.equals("E", E.e1.foo());
+  Expect.equals("E", EAlias.e1.foo());
+}

LanguageFeatures/Augmentation-libraries/augmenting_types_A01_t03_lib.dart

@@ -0,0 +1,28 @@
+// 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.
+
+/// @assertion It is a compile-time error if:
+///
+/// - The augmenting type and corresponding type are not the same kind: class,
+///   mixin, enum, or extension. You can't augment a class with a mixin, etc.
+///
+/// @description Checks that it is not an error if an augmenting type and the
+/// corresponding type are the same kind. Test type aliases
+/// @author sgrekhov22@gmail.com
+
+// SharedOptions=--enable-experiment=macros
+
+augment library 'augmenting_types_A01_t03.dart';
+
+augment class CAlias {
+  String foo() => "C";
+}
+
+augment mixin MAlias {
+  String foo() => "M";
+}
+
+augment enum EAlias {
+  String foo() => "E";
+}