| /* |
| * 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. |
| */ |
| /** |
| * @assertion If a class [C] in an opted-in library implements the same generic |
| * class [I] more than once as [I0], .., [In], and at least one of the [Ii] is |
| * not syntactically equal to the others, then it is an error if |
| * [NNBD_TOP_MERGE(S0, ..., Sn)] is not defined where [Si] is [NORM(Ii)]. |
| * Otherwise, for the purposes of runtime subtyping checks, [C] is considered to |
| * implement the canonical interface given by [NNBD_TOP_MERGE(S0, ..., Sn)]. |
| * |
| * @description Check that result of [NNBD_TOP_MERGE(FutureOr, Object?)] is |
| * [FutureOr]. |
| * |
| * @Issue 40454,40541,41576 |
| * @author iarkh@unipro.ru |
| */ |
| // Requirements=nnbd-strong |
| |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| class B extends CHECK_TOP_MERGE<FutureOr> {} |
| class C extends CHECK_TOP_MERGE<Object? > {} |
| |
| class D1 extends C implements B {} |
| class D2 extends B implements C {} |
| |
| main() { |
| Expect.isTrue(D1().f is Object? Function(Object?)); |
| Expect.isTrue(D2().f is Object? Function(Object?)); |
| } |
