| // 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. |
| |
| // @dart = 2.9 |
| |
| /// @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 given expression works if some ot the spread |
| /// elements is [null]. |
| /// @author iarkh@unipro.ru |
| |
| |
| import "../../Utils/expect.dart"; |
| |
| main() { |
| List list = [1, 12, 24]; |
| Map map = {1: 1, "test": 1, 14: null}; |
| |
| Set res1 = {...list, ...?null}; |
| Expect.setEquals({1, 12, 24}, res1); |
| |
| Set res2 = {...?null, ...list}; |
| Expect.setEquals({1, 12, 24}, res2); |
| |
| Map res3 = {...?null, ...map}; |
| Expect.mapEquals(map, res3); |
| |
| Map res4 = {...map, ...?null}; |
| Expect.mapEquals(map, res4); |
| } |