| /* |
| * 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 map, and at least one element must be a map, then e |
| * is a map literal with static type Map<K, V> where K is the least upper bound |
| * of the key types of the elements and V is the least upper bound of the value |
| * types. |
| * |
| * @description Checks that if all elements can be a map, and at least one |
| * element must be a map, then e is a map literal with static type Map<K, V> |
| * where K is the least upper bound of the key types of the elements and V is |
| * the least upper bound of the value types. |
| * @author sgrekhov@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=constant-update-2018 |
| import "../../Utils/expect.dart"; |
| |
| main() { |
| var n = null; |
| var m1 = {...?n, 1: 2}; |
| Expect.isTrue(m1 is Map<Object, Object>); |
| Expect.isFalse(m1 is Map<int, int>); |
| Expect.isFalse(m1 is Map<Null, Null>); |
| |
| var m2 = {1: 2, ...?n}; |
| Expect.isTrue(m2 is Map<Object, Object>); |
| Expect.isFalse(m2 is Map<int, int>); |
| Expect.isFalse(m2 is Map<Null, Null>); |
| } |