| /* |
| * Copyright (c) 2019, 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 an error for a class to extend, implement, or mixin the type |
| * Never |
| * |
| * @description Check that it is an error for a class to extend, implement, |
| * or mixin the type Never |
| * @author sgrekhov@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=non-nullable |
| class A {} |
| class B {} |
| |
| class C1 extends Never {} |
| // ^^^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| class C2 implements Never {} |
| // ^^^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| class C3 = A with Never; |
| // ^^^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| class C4 = A with B implements Never; |
| // ^^^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| class C5 extends A with Never {} |
| // ^^^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| mixin M1 on Never {} |
| // ^^^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| mixin M2 on A, Never {} |
| // ^^^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| mixin M3 on A implements Never {} |
| // ^^^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| |
| main() { |
| } |
