| // 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. |
| |
| // @dart = 2.7 |
| |
| // dart2jsOptions=--strong |
| |
| import 'package:expect/expect.dart'; |
| |
| class Class1a<T> { |
| Class1a(); |
| |
| bool operator ==(other) { |
| if (identical(this, other)) return true; |
| return runtimeType == other?.runtimeType; |
| } |
| } |
| |
| class Class1b<T> extends Class1a<T> { |
| Class1b(); |
| } |
| |
| class Class1c<T> implements Class1a<T> { |
| Class1c(); |
| } |
| |
| class Class2<T> { |
| Class2(); |
| } |
| |
| main() { |
| Class1a<int> cls1a = new Class1a<int>(); |
| Class1a<int> cls1b1 = new Class1b<int>(); |
| Class1a<int> cls1b2 = new Class1b<int>(); |
| Class1c<int> cls1c = new Class1c<int>(); |
| Class2<int> cls2 = new Class2<int>(); |
| Expect.isFalse(cls1a == cls1b1); |
| Expect.isTrue(cls1b1 == cls1b2); |
| Expect.isFalse(cls1a == cls1c); |
| Expect.isFalse(cls1a == cls2); |
| } |