LanguageFeatures/Spread-collections/StaticSemantic_A03_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 For spreading into map literals, we require the spread object to
 * be a class that implements [Map], but not necessarily a subtype of the map
 * being spread into.
 * @description Checks that [Map] object can be spread into the spreadable map.
 * @author iarkh@unipro.ru
 */
// SharedOptions=--enable-experiment=constant-update-2018

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

class MyIterable extends IterableBase {

  MyIterable();

  Iterator get iterator => MyIterator();
}

class MyIterator extends Iterator {
  int i = -1;

  MyIterator() {}

  @override
  bool moveNext() { return ++i < 10; }

  @override
  dynamic get current { return i; }
}

main() {
  LinkedHashMap aMap = Map.fromIterables(new MyIterable(), new MyIterable());
  Map map = {...aMap};
  Expect.mapEquals(
      {0: 0, 1: 1, 2: 2, 3: 3, 4: 4, 5: 5, 6: 6, 7: 7, 8: 8, 9: 9}, map);

  map = {...?aMap};
  Expect.mapEquals(
  {0: 0, 1: 1, 2: 2, 3: 3, 4: 4, 5: 5, 6: 6, 7: 7, 8: 8, 9: 9}, map);
}