| // 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 The implicit interface of class I is a direct supertype of the |
| * implicit interface of class J iff: |
| * • If I is Object, and J has no extends clause |
| * • If I is listed in the extends clause of J. |
| * • If I is listed in the implements clause of J |
| * • If I is listed in the with clause of J |
| * • If J is a mixin application of the mixin of I. |
| * @description Checks that a type listed in the extends clause of another |
| * class is its supertype. |
| * @author iefremov |
| */ |
| import "../../../Utils/expect.dart"; |
| |
| class I {} |
| |
| class J extends I {} |
| |
| main() { |
| Expect.isTrue(new J() is I); |
| } |