| // Copyright (c) 2015, 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 a class to attempt to extend, |
| /// mix in or implement String. |
| /// @description Checks that String cannot be mixed in abstract class |
| /// @compile-error |
| /// @author sgrekhov@unipro.ru |
| |
| class A {} |
| |
| abstract class C extends A with String {} |
| |
| main() { |
| C? c = null; |
| } |
