| /* |
| * 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 opted-in class, then |
| * compiler error is thrown if parent class method returns [Never] and child |
| * method |
| * return value which is not of the type [Null]. |
| * |
| * @author iarkh@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=non-nullable |
| // @dart=2.6 |
| |
| import "override_checking_opted_in_lib.dart"; |
| |
| class A1 implements A { |
| |
| int test_return_never() => null; |
| // ^^^^^^^^^^^^^^^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| |
| void test_nullable(int i) {} |
| int test_return_nullable() => 4; |
| void test_required({int i = 1}) {} |
| void test_never(Null i) {} |
| String field1 = "a"; |
| String field2 = "b"; |
| String get get_field1 => field1; |
| String get get_field2 => field1; |
| void set set_field1(String str) { field1 = str; } |
| void set set_field2(String str) { field2 = str; } |
| } |
| |
| main() {} |
