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
16 interface Interface {
17    instance_field: number
18}
19
20abstract class Abstract {
21    instance_field: number = -1
22}
23
24class Base extends Abstract {
25}
26
27class Derived extends Base implements Interface {
28    instance_field: number = -1
29
30    public method(): number {
31        this.instance_field -= 1
32        super.instance_field += 1
33        return super.instance_field
34    }
35}
36
37function main() {
38    let d = new Derived
39    assert d.method() == 0 
40    assert d.instance_field == -2
41}
42