| // 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 The grammar changes for map and set are a little more complex |
| /// because of the potential ambiguity of collections containing only spreads. |
| /// The changed and new rules are: |
| /// |
| /// setOrMapLiteral: |
| /// mapLiteral | |
| /// setLiteral | |
| /// mapOrSetLiteral |
| /// ; |
| /// |
| /// mapLiteral: |
| /// const? typeArguments? '{' mapLiteralEntryList? '}' |
| /// ; |
| /// |
| /// mapLiteralEntryList: |
| /// mapLiteralEntry ( ',' mapLiteralEntry )* ','? |
| /// ; |
| /// |
| /// mapLiteralEntry: |
| /// expression ':' expression | |
| /// spread |
| /// ; |
| /// |
| /// setLiteral: |
| /// 'const'? typeArguments? '{' spreadableList '}' ; |
| /// |
| /// mapOrSetLiteral: |
| /// 'const'? '{' spread (',' spread)* '}' ; |
| /// |
| /// @description Checks that spreadable element can be null-aware in spreadable |
| /// map |
| /// @author iarkh@unipro.ru |
| |
| import "../../Utils/expect.dart"; |
| |
| main() { |
| Map? nullMap = null; |
| |
| Expect.mapEquals({}, {...?nullMap}); |
| Expect.mapEquals({1: 1}, {1: 1, ...?nullMap}); |
| Expect.mapEquals({1: 1}, {...?nullMap, 1: 1}); |
| } |