| // Copyright (c) 2022, 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=class-modifiers | |
| // Allow base classes to be extended by multiple classes in the same library. | |
| base class BaseClass { | |
| int foo = 0; | |
| } | |
| abstract base class A extends BaseClass {} | |
| base class B extends BaseClass {} |