| /* | |
| * Copyright (c) 2018, 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. | |
| */ | |
| /** | |
| * @description Regression test for issue 33421 (Dart does not throw error when | |
| * type parameter is a supertype of its upper bound): checks that type parameter | |
| * cannot extend itself | |
| * @compile-error | |
| * @Issue 33421 | |
| * @author iarkh@unipro.ru | |
| */ | |
| class A<X extends X> {} | |
| main() {} |