| /* |
| * 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 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 implements two classes with some |
| * getter (one or both classes are opted-in), all nullability annotations in the |
| * parent class are ignored in the child class type parameters and legacy class |
| * type parameter can be [Null]. |
| * |
| * @author iarkh@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=non-nullable |
| // @dart=2.4 |
| |
| import "../../Utils/expect.dart"; |
| import "override_checking_opted_in_lib.dart"; |
| |
| abstract class F<X extends A> { |
| dynamic getParamType(); |
| } |
| |
| class DE<X extends A> implements D<X>, E<X> { |
| dynamic getParamType() => X; |
| } |
| |
| class DF<X extends A> implements D<X>, F<X> { |
| dynamic getParamType() => X; |
| } |
| |
| class EF<X extends A> implements D<X>, F<X> { |
| dynamic getParamType() => X; |
| } |
| |
| main() { |
| DE<Null> de = DE<Null>(); |
| Expect.equals(Null, de.getParamType()); |
| |
| DF<Null> df = DF<Null>(); |
| Expect.equals(Null, df.getParamType()); |
| |
| EF<Null> ef = EF<Null>(); |
| Expect.equals(Null, ef.getParamType()); |
| } |