| // 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] for the following cases: |
| * NNBD_TOP_MERGE(FutureOr*, FutureOr*) = FutureOr |
| * NNBD_TOP_MERGE(FutureOr<int>>*, FutureOr<int>>) = FutureOr<int?> |
| * NNBD_TOP_MERGE<FutureOr<FutureOr>>*, FutureOr<FutureOr>>*) = FutureOr<FutureOr> |
| * |
| * @author iarkh@unipro.ru |
| */ |
| // Requirements=nnbd-weak |
| |
| import "dart:async"; |
| import "../../../../Utils/expect.dart"; |
| import "override_checking_A06_opted_out_lib.dart"; |
| |
| class C1 extends out_FutureOr implements out_FutureOr1 {} |
| class C2 extends out_FutureOr_int implements out_FutureOr_int1 {} |
| class C3 extends out_FutureOr_FutureOr implements out_FutureOr_FutureOr1 {} |
| |
| main() { |
| Expect.isTrue(C1().f is FutureOr Function(FutureOr)); |
| Expect.isTrue(C2().f is FutureOr<int?> Function(FutureOr<int?>)); |
| Expect.isTrue(C3().f is FutureOr<FutureOr> Function(FutureOr<FutureOr>)); |
| } |