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 cls {}
17
18let b : cls | null = null;
19let c : cls = new cls();
20
21function foo(arg: cls | null) : void {
22}
23
24function main(): void {
25    foo(b);
26    foo(c);
27
28    let e : cls | null = null;
29    let f : cls = new cls();
30
31    foo(e);
32    foo(f);
33
34    foo(null);
35    foo(new cls());
36
37    assert (b == null && c != null)
38    assert (null != c)
39    assert (e == null && f != null)
40    assert (b == e)
41    assert (null == null)
42
43    return;
44}
45