#2559. Add test that EnumName extension is not augmentable (#2899)

Author: sgrekhov

LanguageFeatures/Augmentation-libraries/augmenting_enum_values_A05_t04.dart

@@ -53,6 +53,8 @@ augment enum E4 {
 main() {
   Expect.equals("name", E1.e0.name);
   Expect.equals("name2", E2.e0.name);
+  Expect.equals("e0", EnumName(E1.e0).name);
+  Expect.equals("e0", EnumName(E2.e0).name);
   Expect.equals("E3.name", E3.name);
   Expect.equals("E4.name", E4.name);
 }

LanguageFeatures/Augmentation-libraries/augmenting_enum_values_A05_t05.dart

@@ -0,0 +1,41 @@
+// 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 Some enum members can not be augmented: It is a compile-time
+/// error if an augmenting declaration in an enum declaration (introductory or
+/// augmenting) has the name `values`, `index`, `hashCode`, or `==`.
+///
+/// @description Checks that it is not an error to declare or augment `name`
+/// static member or property.
+/// @author [email protected]
+
+// SharedOptions=--enable-experiment=macros
+
+import '../../Utils/expect.dart';
+
+enum E1 {
+  e0;
+}
+
+augment enum E1 {
+  augment e0;
+  static String get name => "name1";
+}
+
+enum E2 {
+  e0;
+  static String get name => "name";
+}
+
+augment enum E2 {
+  augment e0;
+  augment static String get name => "name2";
+}
+
+main() {
+  Expect.equals("name1", E1.name);
+  Expect.equals("e0", E1.e0.name);
+  Expect.equals("name2", E2.e0.name);
+  Expect.equals("e0", E2.e0.name);
+}