| // 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 Members inherited in a class in an opted-in library, which are |
| /// inherited via a class or mixin defined in a legacy library are viewed with |
| /// their erased legacy signature, even if they were original defined in an |
| /// opted-in library. Note that if a class which is defined in a legacy library |
| /// inherits a member with the same name from multiple super-interfaces, then |
| /// error checking is done as usual using the legacy typing rules which ignore |
| /// nullability. This means that it is valid for a legacy class to inherit the |
| /// same member signature with contradictory nullability information. For the |
| /// purposes of member lookup within a legacy library, nullability information is |
| /// ignored, and so it is valid to simply erase the nullability information |
| /// within the legacy library. When referenced from an opted-in library, the same |
| /// erasure is performed, and the member is seen at its legacy type. |
| /// |
| /// We use legacy subtyping when checking inherited member signature coherence in |
| /// classes because opted out libraries may bring together otherwise incompatible |
| /// member signatures without causing an error. |
| /// |
| /// @description Check that legacy class can inherit the same getter from two |
| /// opted in classes with contradictory nullability information. |
| /// |
| /// @author iarkh@unipro.ru |
| |
| // Requirements=nnbd-weak |
| |
| import "../../../../Utils/expect.dart"; |
| import "override_checking_A03_opted_out_lib.dart"; |
| import "override_checking_A03_opted_in_lib.dart"; |
| |
| main() { |
| LEGACY_GETTER_1 x1 = LEGACY_GETTER_1(); |
| Expect.isNull(x1.getInt); |
| Expect.isNull(x1.getObject); |
| Expect.isNull(x1.getFunction); |
| |
| LEGACY_GETTER_2 x2 = LEGACY_GETTER_2(); |
| Expect.equals(1, x2.getInt); |
| Expect.equals(1, x2.getObject); |
| Expect.equals(testme, x2.getFunction); |
| } |