LanguageFeatures/Spread-collections/ConstSpreads_A09_t20.dart

/*
 * 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 From the Unified collection Spec:
 * A spreadElement starting with [...] is a constant element if its expression
 * is constant and it evaluates to 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 a potentially constant expression.
 * @description: Checks that constant map spread element can be constant map.
 * @author iarkh@unipro.ru
 */
// SharedOptions=--enable-experiment=constant-update-2018

import "../../Utils/expect.dart";

main() {
  const Map res1 = const {...{1: 1, 2: 2}, 4: 3};
  Expect.mapEquals({1:1, 2: 2, 4: 3}, res1);

  const Map res2 = const {...<Object, Object>{}};
  Expect.mapEquals(<Object, Object>{}, res2);

  const Map res3 = const {...{}};
  Expect.mapEquals({}, res3);
}