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

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

class MyIterable extends IterableBase {

  MyIterable();

  Iterator get iterator => MyIterator();
}

class MyIterator implements Iterator {
  int i = -1;

  MyIterator() {}

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

  @override
  dynamic get current { return i; }
}

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