| /* |
| * 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 two class type |
| * parameters cannot extend each other. |
| * @compile-error |
| * @author iarkh@unipro.ru |
| */ |
| class A<X extends X1, X1 extends X> {} |
| |
| main() {} |
