LanguageFeatures/Spread-collections/ConstSpreads_A09_t01.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 list spread element can be constant list
/// or set.
/// @author iarkh@unipro.ru

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

const l1 = [];
const l2 = [1, 2, 3];
const Set s1 = {};
const s2 = {11};

main() {
  const List res1 = const [...l1];
  Expect.listEquals(l1, res1);

  const List res2 = const [...l2];
  Expect.listEquals(l2, res2);

  const List res3 = const [...s1];
  Expect.listEquals([], res3);

  const List res4 = const [...l2];
  Expect.listEquals(l2, res4);

  const List res5 = [...l1, ...l2, ...s1, ...s2];
  Expect.listEquals([1, 2, 3, 11], res5);
}