| /* |
| * 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. |
| */ |
| /** |
| * @assertion In a migrated library, override checking must check that an |
| * override is consistent with all overridden methods from other migrated |
| * libraries in the super-interface chain, since a legacy library is permitted |
| * to override otherwise incompatible signatures for a method. |
| * |
| * @description Check that if opted-in class implements legacy class, child |
| * opted-in method can return non-nullable value. |
| * |
| * @author iarkh@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=non-nullable |
| |
| import "override_checking_legacy_lib.dart"; |
| import "../../Utils/expect.dart"; |
| |
| class A1 implements A { |
| int test_return_nullable() => 2; |
| Null test_return_never() => null; |
| } |
| |
| main() { |
| Expect.equals(2, A1().test_return_nullable()); |
| } |
