| /* |
| * Copyright (c) 2020, 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 An abstract instance variable declaration D is treated as an |
| * abstract getter declaration and possibly an abstract setter declaration. The |
| * setter is included if and only if D is non-final. The return type of the |
| * getter and the parameter type of the setter, if present, is the type of D |
| * (which may be declared explicitly, obtained by override inference, or |
| * defaulted to dynamic). The parameter of the setter, if present, has the |
| * modifier covariant if and only if D has the modifier covariant |
| * |
| * @description Checks that declaration |
| * abstract covariant num cn; |
| * desugared as |
| * num get cn; |
| * void set cn(covariant num _); |
| * @author sgrekhov@unipro.ru |
| */ |
| import "../../Utils/expect.dart"; |
| |
| abstract class A { |
| abstract covariant num cn; |
| } |
| |
| class C1 extends A { |
| num get cn => 3.14; |
| void set cn(num _) {} |
| } |
| |
| class C2 extends C1 { |
| // Without covariant keyword in class A overrides below are not valid |
| int get cn => 42; |
| void set cn(int _) {} |
| } |
| |
| main() { |
| C2 c2 = new C2(); |
| Expect.equals(42, c2.cn); |
| } |