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
16let b : Int = 10;
17
18function foo(): Int {
19  b = 11;
20  return 12;
21}
22
23function main() : void {
24  let a : Int = 1;
25  let c = a ?? foo();
26  assert(b == 10);
27  assert(c == 1);
28
29  a = null;
30  c = a ?? b;
31  assert (c == 10);
32
33  c = a ?? foo();
34  assert (b == 11);
35  assert (c == 12);
36
37  let d : Boolean = true;
38  let e : boolean = false;
39  let f = d ?? e;
40  assert (f == true);
41}
42