| /* |
| * Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file |
| * for details. All rights reserved. Use of this source code is governed by a |
| * BSD-style license that can be found in the LICENSE file. |
| */ |
| /** |
| * @assertion Finally, we define inference on a setOrMapLiteral collection as |
| * follows: |
| * ... |
| * Otherwise, collection is still ambiguous, the downwards context for the |
| * elements of collection is ?, and the disambiguation is done using the |
| * immediate elements of collection as follows: |
| * |
| * If all elements can be a set, and at least one element must be a set, then |
| * collection is a set literal with static type Set<T> where T is the least |
| * upper bound of the set element types of the elements. |
| * |
| * @description Checks that if all elements can be a set, and at least one |
| * element must be a set, then collection is a set literal with static type |
| * Set<T> where T is the least upper bound of the set element types of the |
| * elements |
| * @author sgrekhov@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=constant-update-2018 |
| import "../../Utils/expect.dart"; |
| |
| main() { |
| var n = null; |
| var s1 = {...?n, 1}; |
| Expect.isTrue(s1 is Set<Object>); |
| Expect.isFalse(s1 is Set<int>); |
| Expect.isFalse(s1 is Set<Null>); |
| |
| var s2 = {1, ...?n}; |
| Expect.isTrue(s2 is Set<Object>); |
| Expect.isFalse(s2 is Set<int>); |
| Expect.isFalse(s2 is Set<Null>); |
| } |