1/*
2 * Copyright (c) 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 C {}
17
18function foo(arg?: number): C | undefined {
19  if (arg == 5) return new C();
20  return arg == 3 ? undefined : new C();
21}
22
23function main() {
24    assert(foo(5) instanceof C);
25    assert(foo(3) == undefined);
26    assert(foo(undefined) instanceof C);
27}
28