| // 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<int?>, |
| /// [FutureOr<int>*] is [FutureOr<int?>]. |
| /// |
| /// @Issue 40553 |
| /// @author iarkh@unipro.ru |
| |
| // Requirements=nnbd-weak |
| |
| import "dart:async"; |
| import "../../../../Utils/expect.dart"; |
| import "override_checking_A06_opted_out_lib.dart"; |
| |
| class B extends CheckTopMerge<FutureOr<int?>> {} |
| |
| class D1 extends out_FutureOr_int implements B {} |
| class D2 extends B implements out_FutureOr_int {} |
| |
| main() { |
| Expect.isTrue(D1().f is FutureOr<int?> Function(FutureOr<int>)); |
| Expect.isTrue(D2().f is FutureOr<int?> Function(FutureOr<int>)); |
| Expect.runtimeIsType<FutureOr<int?> Function(FutureOr<int?>)>(D1().f); |
| Expect.runtimeIsType<FutureOr<int?> Function(FutureOr<int?>)>(D2().f); |
| } |