| /* |
| * 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 a type |
| * of the form T? for any T. |
| * |
| * @description Check that it is an error for a class to extend, implement, |
| * or mixin a type of the form T? for any T. |
| * @author sgrekhov@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=non-nullable |
| class A {} |
| class B {} |
| class C {} |
| |
| class C1 extends A? {} //# 01: compile-time error |
| class C2 implements A? {} //# 02: compile-time error |
| class C3 = A with B?; //# 03: compile-time error |
| class C4 = A with B implements C?; //# 04: compile-time error |
| class C5 extends A with B? {} //# 05: compile-time error |
| mixin M1 on A? {} //# 06: compile-time error |
| mixin M2 on A, B? {} //# 07: compile-time error |
| mixin M3 on A implements B? {} //# 08: compile-time error |
| |
| main() { |
| } |
