// Copyright (c) 2017, 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.

// @dart = 2.9

/// @assertion abstract E reduce(E combine(E value, E element))
/// The iterable must have at least one element.
/// @description Checks that error state exception is thrown if queue is empty.
/// @author iarkh@unipro.ru


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

class MyIterable extends Object with IterableMixin {
  List _content;
  MyIterable(List list): _content = list;

  Iterator get iterator {
    return _content.iterator;
  }
}

test (combine, element) {
  return combine + element;
}

main() {
  IterableMixin iterable = new MyIterable([]);
  Expect.throws(() { iterable.reduce(test); }, (e) => e is StateError);
}