/*
 * Copyright (c) 2021-2024 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

class A {
    foo() : int {
        return 1;
    }
}

class B extends A {
    override foo() : int {
        return 2;
    }
}

function main() : void {
    let x : A = new A();
    assert (x.foo() == 1)

    let y : B = new B();
    assert (y.foo() == 2)

    let z : A = new B();
    assert (z.foo() == 2)
}