#1258. Not regular-bounded enum test added

Author: sgrekhov

LanguageFeatures/Enhanced-Enum/semantics_A13_t01.dart

@@ -0,0 +1,33 @@
+// Copyright (c) 2022, 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 If the resulting class would have any naming conflicts, or other
+/// compile-time errors, the enum declaration is invalid and a compile-time
+/// error occurs. Such errors include, but are not limited to:
+/// ...
+/// Declaring a generic enum which does not have a regular-bounded
+/// instantiate-to-bounds result and that has an enum value declaration omitting
+/// the type arguments and not having arguments from which type arguments can be
+/// inferred. (For example enum EnumName<F extends C<F>> { foo; } would
+/// introduce an implicit static const foo = EnumName(0, "foo"); declaration
+/// where the constructor invocation requires a regular-bounded
+/// instantiate-to-bounds result).
+///
+/// @description Check that it is a compile-time error to declare a generic enum
+/// which does not have a regular-bounded instantiate-to-bounds result
+/// @author [email protected]
+
+// SharedOptions=--enable-experiment=enhanced-enums
+
+typedef A<X> = X Function(X);
+
+enum E<Y extends A<Y>> {
+//   ^
+// [analyzer] unspecified
+// [cfe] unspecified
+  e1<Never>();
+}
+main() {
+  E.e1;
+}