| // 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 |
| /// potentially constant map or [null]. |
| /// @author iarkh@unipro.ru |
| |
| |
| class A { |
| const A(); |
| } |
| |
| class B extends A { |
| const B(); |
| } |
| |
| class MyClass { |
| final String a; |
| const MyClass(Object o) : a = o as String; |
| } |
| |
| |
| main() { |
| const Map l1 = {...?(A() is B ? {1: 12345} : <Object, Object>{})}; |
| const Map l2 = {...?(A() is A ? {12345: 4} : {0: 1})}; |
| const Map l3 = {...?(MyClass("test") is MyClass ? {"a": "b"} : <int, int>{})}; |
| const Map m4 = {...?(A() is B ? {6: 7} : null)}; |
| } |