blob: 78364bb740f48ff16c0115b5d5b9522fb2d850e1 [file] [log] [blame]
/*
* 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);
}