1/*
2 * Copyright (c) 2021-2024 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 {
17    public readonly a: int;
18
19    constructor() {
20        this.a = 42;
21    }
22}
23
24final class B extends A {
25
26}
27
28final class C extends A {
29    constructor() {
30
31    }
32}
33
34final class D extends A {
35    constructor() {
36        super();
37    }
38}
39
40
41function main(): void {
42    const a: A = new A();
43    assert a.a == 42;
44
45    const b: B = new B();
46    assert b.a == 42;
47
48    const c: C = new C();
49    assert c.a == 42;
50
51    const d: D = new D();
52    assert d.a == 42;
53
54    let d_as_A: A = d;
55    assert d_as_A.a == 42;
56}
57