| // 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. |
| |
| // SharedOptions=--enable-experiment=non-nullable |
| |
| // Test that it is an error to use a nullable type as a supertype. |
| import 'package:expect/expect.dart'; |
| import 'dart:core'; |
| import 'dart:core' as core; |
| |
| main() {} |
| |
| class A {} |
| class B extends A? {} //# 01: compile-time error |
| class B implements A? {} //# 02: compile-time error |
| class B with A? {} //# 03: compile-time error |
| mixin B on A? {} //# 04: compile-time error |
| mixin B implements A? {} //# 05: compile-time error |
