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


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);
}