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 B {
17    foo(a: int, op?: int): int { return a }
18}
19class A extends B {
20    override foo(a: int, op?: int): int { return a }
21}
22
23class C<T> {
24  foo(a: T, op?: T): T { return a }
25}
26class D<T> extends C<T> {
27  override foo(a: T, op?: T): T { return a }
28}
29
30function main(){
31    let a = new A();
32    let b = new B();
33    let c = new C<string>();
34    let d = new D<string>();
35 
36    assert(b.foo(5) == a.foo(5));
37    assert(b.foo(6) != a.foo(5));
38    assert(b.foo(5) != a.foo(6));
39    assert(c.foo("x") == d.foo("x"));
40    assert(c.foo("x") != d.foo("y"));
41    assert(c.foo("y") != d.foo("x"));
42}
43