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 dummy(): String[] | null {
17    return null;
18}
19
20function main(): void {
21    let a: String[] | null = dummy();
22    let b = a?.[1];
23    let d: String = "foo";
24    let c: String = b ?? d;
25    assert(c == "foo");
26}
27