LanguageFeatures/Spread-collections/DynamicSemantics_Set_A03_t03.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 collections Specification:
/// If the literal is constant, the list is canonicalized and immutable,
/// otherwise it is not.
/// @description Checks that constant set is cannonicalized and immutable.
/// @author iarkh@unipro.ru


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

const List? list1 = [1, 2, 3, 4, 5];
const List? list2 = [];

const Set? set1 = {1, 2, 3, 4, 5};
const Set? set2 = {};

main() {
  const Set res1 = {...?list1};
  Expect.equals(set1, res1);
  Expect.throws(() => res1.add(123));

  const Set res2 = {...?set1};
  Expect.equals(set1, res2);
  Expect.throws(() => res2.clear());

  const Set res3 = {...?list2};
  Expect.equals(set2, res3);
  Expect.throws(() => res3.add(123));

  const Set res4 = {...?set2};
  Expect.equals(set2, res4);
  Expect.throws(() => res4.clear());

  const List res5 = [...?null];
  Expect.equals(list2, res5);
  Expect.throws(() => res5.add(-8));
}