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
16function foo1(): Int[] | null {
17    return null;
18}
19
20function foo2(): Int[] | null {
21    let obj_tmp: Int[] = [11, 21, 31];
22    return obj_tmp;
23}
24
25function main(): void {
26  let x: int = 0;
27
28  let potentiallyNullObj: Int[] | null = foo1();
29  let number: Int | undefined = potentiallyNullObj?.[x++] ?? 2;
30  assert(number == 2);
31  assert(x == 0); // 0 as x was not incremented
32
33  let obj: Int[] | null = foo2();
34  number = obj?.[x++];
35
36  let a : Int = 11;
37  assert(number == a);
38  assert(x == 1); // 1 as x was incremented
39}
40