| // 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 In an unmigrated library, override checking is done using legacy |
| /// types. This means that an unmigrated library can bring together otherwise |
| /// incompatible methods. When choosing the most specific signature during |
| /// interface computation, all nullability and requiredness annotations are |
| /// ignored, and the [Never] type is treated as [Null]. |
| /// |
| /// @description Check that if legacy class extends opted-in class, legacy method |
| /// can return [null] if parent method return type is nullable. |
| /// |
| /// @author iarkh@unipro.ru |
| |
| // Requirements=nnbd-weak |
| // @dart=2.6 |
| |
| import "dart:async"; |
| import "../../../../Utils/expect.dart"; |
| import "override_checking_A01_opted_in_lib.dart"; |
| |
| class A extends OPTED_NULLABLE_RETURN { |
| int getInt() => null; |
| Object getObject() => null; |
| Function getFunction() => null; |
| FutureOr getFutureOr() => null; |
| dynamic getDynamic() => null; |
| Null getNull() => null; |
| } |
| |
| main() { |
| A a = A(); |
| |
| Expect.isNull(a.getInt()); |
| Expect.isNull(a.getObject()); |
| Expect.isNull(a.getFutureOr()); |
| Expect.isNull(a.getDynamic()); |
| Expect.isNull(a.getFunction()); |
| Expect.isNull(a.getNull()); |
| } |