| // 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 Null. | |
| /// @description Checks that Null cannot be mixed in abstract class | |
| /// @compile-error | |
| /// @author sgrekhov@unipro.ru | |
| class A {} | |
| abstract class C extends A with Null {} | |
| main() { | |
| C; | |
| } |