| // 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. |
| |
| // This test checks for compile-time errors in cases when either Never or T? is |
| // extended, implemented, or mixed in, where T is a type. |
| |
| class A {} |
| |
| class B {} |
| |
| class C extends B with A? {} |
| class C1 extends B with Never {} |
| |
| class D extends A? {} |
| class D1 extends Never {} |
| |
| class E implements B? {} |
| class E1 implements Never {} |
| |
| main() {} |
