pkg/front_end/testcases/class_modifiers/base/base_class_declaration.dart

// 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.

base class A {}

abstract base class B {}

base mixin M {}
base class C = Object with M;