1/*
2 * Copyright (c) 2023-2024 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
16interface iface {
17  foo(): int;
18}
19
20class A implements iface {
21  public override foo(): int {
22    return 10;
23  }
24}
25
26class B extends A {
27  public override foo(): int {
28    return 20;
29  }
30}
31
32function main() : void {
33    let a : A = new A();
34    let b : B = new B();
35
36    assert a.foo() == 10;
37    assert (a as iface).foo() == 10;
38    assert b.foo() == 20;
39    assert (b as iface).foo() == 20;
40}
41