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
16function main() {
17  let x: Number|String|undefined = "test1";
18
19  let lam: () => void = () => {
20     x = 7; 
21  };
22
23  if (x instanceof string) {
24    let tmp: string = x;            // no smart cast!
25  }	
26}
27
28/* @@? 24:23 Error TypeError: Type 'Double|String|undefined' cannot be assigned to type 'String'  */
29