| // Copyright (c) 2019, 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 a migrated library, override checking must check that an |
| /// override is consistent with all overridden methods from other migrated |
| /// libraries in the super-interface chain, since a legacy library is permitted |
| /// to override otherwise incompatible signatures for a method. |
| /// |
| /// @description Check that if opted-in class implements legacy class, child |
| /// opted-in method can return [null]. |
| /// |
| /// @author iarkh@unipro.ru |
| |
| // Requirements=nnbd-weak |
| import "dart:async"; |
| import "../../../../Utils/expect.dart"; |
| import "override_checking_A02_opted_out_lib.dart"; |
| |
| class A implements LEGACY_RETURN { |
| int? getInt() => null; |
| Object? getObject() => null; |
| dynamic getDynamic() => null; |
| Function? getFunction() => null; |
| Null getNull() => null; |
| FutureOr getFutureOr() => null; |
| FutureOr<int>? getFutureOrInt() => null; |
| FutureOr<Function>? getFutureOrFunction() => null; |
| } |
| |
| main() { |
| A a = A(); |
| |
| Expect.isNull(a.getInt()); |
| Expect.isNull(a.getObject()); |
| Expect.isNull(a.getDynamic()); |
| Expect.isNull(a.getFunction()); |
| Expect.isNull(a.getNull()); |
| Expect.isNull(a.getFutureOr()); |
| Expect.isNull(a.getFutureOrInt()); |
| Expect.isNull(a.getFutureOrFunction()); |
| } |