1/* 2 * Copyright (c) 2025 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 A { 17 foo() { 18 return 1 19 } 20} 21 22final class B { 23 foo() { 24 return 2 25 } 26} 27type AAA = A | B 28function foo(a : AAA) { 29 return a.foo() 30} 31function main() { 32 assertEQ(foo(new A()), 1) 33 assertEQ(foo(new B()), 2) 34} 35