pkg/front_end/testcases/general/sealed_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.

// @dart=2.18

sealed class A {}

mixin M {}
sealed class B = Object with M;