| // Copyright (c) 2020, 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. | |
| // Opt out of NNBD: | |
| // @dart = 2.6 | |
| class Legacy_A extends Legacy_B<Legacy_A> {} | |
| class Legacy_B<T extends Legacy_B<T>> extends Legacy_C<Legacy_B> {} | |
| class Legacy_C<U extends Legacy_C<U>> {} |