  // -- start List<$E> mixins.
  // $E is the element type.

  // From Iterable<$E>:

  Iterator<$E> get iterator {
    // Note: NodeLists are not fixed size. And most probably length shouldn't
    // be cached in both iterator _and_ forEach method. For now caching it
    // for consistency.
    return new FixedSizeListIterator<$E>(this);
  }

$if DEFINE_LENGTH_AS_NUM_ITEMS
  // SVG Collections expose numberOfItems rather than length.
  int get length => numberOfItems;
$endif
  dynamic reduce(dynamic initialValue, dynamic combine(dynamic, $E)) {
    return IterableMixinWorkaround.reduce(this, initialValue, combine);
  }

$if DEFINE_CONTAINS
  bool contains($E element) => IterableMixinWorkaround.contains(this, element);
$else
  // contains() defined by IDL.
$endif

  void forEach(void f($E element)) => IterableMixinWorkaround.forEach(this, f);

  String join([String separator]) =>
      IterableMixinWorkaround.joinList(this, separator);

  Iterable map(f($E element)) =>
      IterableMixinWorkaround.mapList(this, f);

  Iterable<$E> where(bool f($E element)) =>
      IterableMixinWorkaround.where(this, f);

  Iterable expand(Iterable f($E element)) =>
      IterableMixinWorkaround.expand(this, f);

  bool every(bool f($E element)) => IterableMixinWorkaround.every(this, f);

  bool any(bool f($E element)) => IterableMixinWorkaround.any(this, f);

  List<$E> toList() => new List<$E>.from(this);
  Set<$E> toSet() => new Set<$E>.from(this);

  bool get isEmpty => this.length == 0;

  Iterable<$E> take(int n) => IterableMixinWorkaround.takeList(this, n);

  Iterable<$E> takeWhile(bool test($E value)) {
    return IterableMixinWorkaround.takeWhile(this, test);
  }

  Iterable<$E> skip(int n) => IterableMixinWorkaround.skipList(this, n);

  Iterable<$E> skipWhile(bool test($E value)) {
    return IterableMixinWorkaround.skipWhile(this, test);
  }

  $E firstMatching(bool test($E value), { $E orElse() }) {
    return IterableMixinWorkaround.firstMatching(this, test, orElse);
  }

  $E lastMatching(bool test($E value), {$E orElse()}) {
    return IterableMixinWorkaround.lastMatchingInList(this, test, orElse);
  }

  $E singleMatching(bool test($E value)) {
    return IterableMixinWorkaround.singleMatching(this, test);
  }

  $E elementAt(int index) {
    return this[index];
  }

  // From Collection<$E>:

  void add($E value) {
    throw new UnsupportedError("Cannot add to immutable List.");
  }

  void addLast($E value) {
    throw new UnsupportedError("Cannot add to immutable List.");
  }

  void addAll(Iterable<$E> iterable) {
    throw new UnsupportedError("Cannot add to immutable List.");
  }

  // From List<$E>:
$if DEFINE_LENGTH_SETTER
  void set length(int value) {
    throw new UnsupportedError("Cannot resize immutable List.");
  }
$endif

$if DEFINE_CLEAR
  void clear() {
    throw new UnsupportedError("Cannot clear immutable List.");
  }
$else
  // clear() defined by IDL.
$endif

  Iterable<$E> get reversed {
    return IterableMixinWorkaround.reversedList(this);
  }

  void sort([int compare($E a, $E b)]) {
    throw new UnsupportedError("Cannot sort immutable List.");
  }

  int indexOf($E element, [int start = 0]) =>
      Lists.indexOf(this, element, start, this.length);

  int lastIndexOf($E element, [int start]) {
    if (start == null) start = length - 1;
    return Lists.lastIndexOf(this, element, start);
  }

  $E get first {
    if (this.length > 0) return this[0];
    throw new StateError("No elements");
  }

  $E get last {
    if (this.length > 0) return this[this.length - 1];
    throw new StateError("No elements");
  }

  $E get single {
    if (length == 1) return this[0];
    if (length == 0) throw new StateError("No elements");
    throw new StateError("More than one element");
  }

  $E min([int compare($E a, $E b)]) =>
      IterableMixinWorkaround.min(this, compare);

  $E max([int compare($E a, $E b)]) =>
      IterableMixinWorkaround.max(this, compare);

  $E removeAt(int pos) {
    throw new UnsupportedError("Cannot remove from immutable List.");
  }

  $E removeLast() {
    throw new UnsupportedError("Cannot remove from immutable List.");
  }

  void remove(Object object) {
    throw new UnsupportedError("Cannot remove from immutable List.");
  }

  void removeAll(Iterable elements) {
    throw new UnsupportedError("Cannot remove from immutable List.");
  }

  void retainAll(Iterable elements) {
    throw new UnsupportedError("Cannot remove from immutable List.");
  }

  void removeMatching(bool test($E element)) {
    throw new UnsupportedError("Cannot remove from immutable List.");
  }

  void retainMatching(bool test($E element)) {
    throw new UnsupportedError("Cannot remove from immutable List.");
  }

  void setRange(int start, int rangeLength, List<$E> from, [int startFrom]) {
    throw new UnsupportedError("Cannot setRange on immutable List.");
  }

  void removeRange(int start, int rangeLength) {
    throw new UnsupportedError("Cannot removeRange on immutable List.");
  }

  void insertRange(int start, int rangeLength, [$E initialValue]) {
    throw new UnsupportedError("Cannot insertRange on immutable List.");
  }

  List<$E> getRange(int start, int rangeLength) =>
      Lists.getRange(this, start, rangeLength, <$E>[]);

  // -- end List<$E> mixins.