| // 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 generic legacy class extends legacy class and |
| /// implements opted-in class, all nullability annotations in the parent interface |
| /// are ignored in the child class and child class type parameter can be [Null] |
| /// even if parent class type parameter is non-nullable. |
| /// |
| /// @Issue 40398 |
| /// @author iarkh@unipro.ru |
| |
| // Requirements=nnbd-weak |
| // @dart=2.6 |
| |
| import "../../../../Utils/expect.dart"; |
| import "override_checking_A01_opted_in_lib.dart"; |
| |
| class B1<T> { dynamic getParamType() => typeOf<T>(); } |
| class B2<T> { dynamic getParamType() => typeOf<T>(); } |
| class B3<T> { dynamic getParamType() => typeOf<T>(); } |
| |
| class A1<T extends Null> extends B1<T> implements OPTED_NONNULLABLE_INT<T> {} |
| class A2<T extends Null> extends B2<T> implements OPTED_NONNULLABLE_OBJECT<T> {} |
| class A3<T extends Null> extends B3<T> implements OPTED_NONNULLABLE_FUNCTION<T> {} |
| |
| main() { |
| Expect.equals(Null, A1().getParamType()); |
| Expect.equals(Null, A1<Null>().getParamType()); |
| |
| Expect.equals(Null, A2().getParamType()); |
| Expect.equals(Null, A2<Null>().getParamType()); |
| |
| Expect.equals(Null, A3().getParamType()); |
| Expect.equals(Null, A3<Null>().getParamType()); |
| } |