1/*
2 * Copyright (c) 2024 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16class A<T> {}
17class B<T> extends A<T> {}
18class C<T> {}
19
20interface Base  {
21    foo<T>(equivalent?: C<T>): A<T>;
22}
23
24class Derived implements Base {
25    public override foo<T>(equivalent?: C<T>): B<T> {
26        return new B<T>();
27    }
28}
29