| // Copyright (c) 2011, 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 for any type other than the types | |
| /// int and double to attempt to extend, mix in or implement num. | |
| /// @description Checks that a user-defined interface can not extend num. | |
| /// @compile-error | |
| /// @author iefremov | |
| abstract class A extends num {} | |
| class B implements A {} | |
| main() { | |
| new B(); | |
| } |