tests/dartdevc/mixin/mixin_declaration.dart

// 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.

mixin B {
  String? _foo = 'B._foo';
  String get foo => _foo!;
}