/*
 * Copyright (c) 2024 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

function main() {
  let x: Number|String|undefined = "test1";

  let lam: () => void = () => {
     x = 7; 
  };

  if (x instanceof string) {
    let tmp: string = x;            // no smart cast!
  }	
}

/* @@? 24:23 Error TypeError: Type 'Double|String|undefined' cannot be assigned to type 'String'  */