| // 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 From the Unified collection Spec: |
| /// A [spreadElement] starting with [...?] is a constant element if its |
| /// expression is constant and it evaluates to [null] or a constant [List], [Set] |
| /// or [Map] instance originally created by a list, set or map literal. It is a |
| /// potentially constant element if the expression is potentially constant |
| /// expression. |
| /// @description: Checks that constant map spread [...?] element can only be a |
| /// constant map or null. |
| /// @author iarkh@unipro.ru |
| |
| |
| main() { |
| const Map res1 = const {...?{1: 1, 2: 2}, 4: 3}; |
| const Map res2 = const {...?<Object, Object>{}}; |
| const Map res3 = const {...?{}}; |
| const Map res4 = const {...?null}; |
| } |
