| /* |
| * 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 An expression like: |
| * { ...a, ...b } |
| * Is syntactically parsed as [mapOrSetLiteral]. To determine whether it |
| * actually is a map or set, the surrounding context is used. Given an |
| * [mapOrSetLiteral] with context type [C]: |
| * |
| * If [Set<Null>] is assignable to [C], and [Map<Null, Null>] is not |
| * assignable to [C], then the collection is a set literal. |
| * |
| * Otherwise, it is a map literal. |
| * |
| * In other words, if it can only be a set, it is. Otherwise, it's a map. |
| * @description Checks that if [a] and [b] are map literals (probably, |
| * null-aware), their spread is a map. |
| * @author iarkh@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=constant-update-2018 |
| |
| import "../../Utils/expect.dart"; |
| |
| main() { |
| var map1 = {1: 1, "test": 1, 14: null}; |
| var map2 = null; |
| var map3 = <String, bool>{}; |
| var map4 = <bool, String>{true: "true", false: "false"}; |
| |
| Map res1 = {...map1, ...?map2}; |
| Expect.mapEquals(map1, res1); |
| |
| Map res2 = {...?map2, ...map3}; |
| Expect.mapEquals(map3, res2); |
| |
| Map res3 = {...?map2, ...map4}; |
| Expect.mapEquals(map4, res3); |
| |
| Map res4 = {...?map1, ...?map2}; |
| Expect.mapEquals(map1, res4); |
| |
| Map res5 = {...?map2, ...?map3}; |
| Expect.mapEquals(map3, res5); |
| |
| Map res6 = {...?map2, ...?map4}; |
| Expect.mapEquals(map4, res6); |
| |
| Map res7 = {...?map1, ...?map2, ...?map3, ...?map4}; |
| Expect.mapEquals( |
| {1: 1, "test": 1, 14: null, true: "true", false: "false"}, res7); |
| } |