| // 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 is a mixin with opted-in class, |
| /// legacy method cannot return anything but [null] if parent method return type |
| /// is [Never]. |
| /// |
| /// @author iarkh@unipro.ru |
| |
| // Requirements=nnbd-weak |
| // @dart=2.6 |
| |
| import "dart:async"; |
| import "override_checking_A01_opted_in_lib.dart"; |
| |
| class A1 with OPTED_NEVER_RETURN { |
| int getNever() => 1; |
| // ^^^^^^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| } |
| |
| class A2 extends OPTED_NEVER_RETURN { |
| Object getNever() => 1; |
| // ^^^^^^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| } |
| |
| class A3 extends OPTED_NEVER_RETURN { |
| dynamic getNever() => 1; |
| // ^^^^^^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| } |
| |
| class A4 extends OPTED_NEVER_RETURN { |
| FutureOr getNever() => 1; |
| // ^^^^^^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| } |
| |
| main() { |
| A1(); |
| A2(); |
| A3(); |
| A4(); |
| } |