remove generated_sdk from checked in code

test/generated_sdk/lib/core/list.dart

Index: test/generated_sdk/lib/core/list.dart
diff --git a/test/generated_sdk/lib/core/list.dart b/test/generated_sdk/lib/core/list.dart
deleted file mode 100644
index c693ba1f05b9632e9d6b44b49b0ec18b97847370..0000000000000000000000000000000000000000
--- a/test/generated_sdk/lib/core/list.dart
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@@ -1,748 +0,0 @@
-// Copyright (c) 2012, 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.
-
-part of dart.core;
-
-/**
- * An indexable collection of objects with a length.
- *
- * Subclasses of this class implement different kinds of lists.
- * The most common kinds of lists are:
- *
- * * Fixed-length list.
- *   An error occurs when attempting to use operations
- *   that can change the length of the list.
- *
- * * Growable list. Full implementation of the API defined in this class.
- *
- * The default growable list, as returned by `new List()` or `[]`, keeps
- * an internal buffer, and grows that buffer when necessary. This guarantees
- * that a sequence of [add] operations will each execute in amortized constant
- * time. Setting the length directly may take time proportional to the new
- * length, and may change the internal capacity so that a following add
- * operation will need to immediately increase the buffer capacity.
- * Other list implementations may have different performance behavior.
- *
- * The following code illustrates that some List implementations support
- * only a subset of the API.
- *
- *     List<int> fixedLengthList = new List(5);
- *     fixedLengthList.length = 0;  // Error
- *     fixedLengthList.add(499);    // Error
- *     fixedLengthList[0] = 87;
- *     List<int> growableList = [1, 2];
- *     growableList.length = 0;
- *     growableList.add(499);
- *     growableList[0] = 87;
- *
- * Lists are [Iterable]. Iteration occurs over values in index order. Changing
- * the values does not affect iteration, but changing the valid
- * indices&mdash;that is, changing the list's length&mdash;between iteration
- * steps causes a [ConcurrentModificationError]. This means that only growable
- * lists can throw ConcurrentModificationError. If the length changes
- * temporarily and is restored before continuing the iteration, the iterator
- * does not detect it.
- *
- * It is generally not allowed to modify the list's length (adding or removing
- * elements) while an operation on the list is being performed,
- * for example during a call to [forEach] or [sort].
- * Changing the list's length while it is being iterated, either by iterating it
- * directly or through iterating an [Iterable] that is backed by the list, will
- * break the iteration.
- */
-@SupportJsExtensionMethod()
-@JsPeerInterface(name: 'Array')
-abstract class List<E> implements Iterable<E>, EfficientLength {
-  /**
-   * Creates a list of the given length.
-   *
-   * The created list is fixed-length if [length] is provided.
-   *
-   *     List fixedLengthList = new List(3);
-   *     fixedLengthList.length;     // 3
-   *     fixedLengthList.length = 1; // Error
-   *
-   * The list has length 0 and is growable if [length] is omitted.
-   *
-   *     List growableList = new List();
-   *     growableList.length; // 0;
-   *     growableList.length = 3;
-   *
-   * To create a growable list with a given length, just assign the length
-   * right after creation:
-   *
-   *     List growableList = new List()..length = 500;
-   *
-   * The [length] must not be negative or null, if it is provided.
-   */
-  factory List([int length]) {
-    dynamic list;
-    if (length == null) {
-      list = JS('', '[]');
-    } else {
-      // Explicit type test is necessary to guard against JavaScript conversions
-      // in unchecked mode.
-      if ((length is !int) || (length < 0)) {
-        throw new ArgumentError("Length must be a non-negative integer: $length");
-      }
-      list = JS('', 'new Array(#)', length);
-      // TODO(jmesserly): consider a fixed array subclass instead.
-      JS('void', r'#.fixed$length = Array', list);
-    }
-    // TODO(jmesserly): skip this when E is dynamic and Object.
-    JS('void', 'dart.setType(#, List\$(#))', list, E);
-    // TODO(jmesserly): compiler creates a bogus type check here.
-    return list;
-  }
-
-  /**
-   * Creates a fixed-length list of the given length, and initializes the
-   * value at each position with [fill]:
-   *
-   *     new List<int>.filled(3, 0); // [0, 0, 0]
-   *
-   * The [length] must not be negative or null.
-   */
-  factory List.filled(int length, E fill) {
-    List<E> result = new List<E>(length);
-    if (length != 0 && fill != null) {
-      for (int i = 0; i < result.length; i++) {
-        result[i] = fill;
-      }
-    }
-    return result;
-  }
-
-  /**
-   * Creates a list containing all [elements].
-   *
-   * The [Iterator] of [elements] provides the order of the elements.
-   *
-   * This constructor returns a growable list when [growable] is true;
-   * otherwise, it returns a fixed-length list.
-   */
-  factory List.from(Iterable elements, { bool growable: true }) {
-    List<E> list = new List<E>();
-    for (var e in elements) {
-      list.add(e);
-    }
-    if (growable) return list;
-    return makeListFixedLength(list);
-  }
-
-  /**
-   * Generates a list of values.
-   *
-   * Creates a list with [length] positions and fills it with values created by
-   * calling [generator] for each index in the range `0` .. `length - 1`
-   * in increasing order.
-   *
-   *     new List<int>.generate(3, (int index) => index * index); // [0, 1, 4]
-   *
-   * The created list is fixed-length unless [growable] is true.
-   */
-  factory List.generate(int length, E generator(int index),
-                       { bool growable: true }) {
-    List<E> result;
-    if (growable) {
-      result = <E>[]..length = length;
-    } else {
-      result = new List<E>(length);
-    }
-    for (int i = 0; i < length; i++) {
-      result[i] = generator(i);
-    }
-    return result;
-  }
-
-  checkMutable(reason) {
-    /* TODO(jacobr): implement.
-    if (this is !JSMutableArray) {
-      throw new UnsupportedError(reason);
-    }
-    * */
-  }
-
-  checkGrowable(reason) {
-    /* TODO(jacobr): implement
-    if (this is !JSExtendableArray) {
-      throw new UnsupportedError(reason);
-    }
-    * */
-  }
-
-  Iterable<E> where(bool f(E element)) {
-    return new IterableMixinWorkaround<E>().where(this, f);
-  }
-
-  Iterable expand(Iterable f(E element)) {
-    return IterableMixinWorkaround.expand(this, f);
-  }
-
-  void forEach(void f(E element)) {
-    int length = this.length;
-    for (int i = 0; i < length; i++) {
-      f(JS('', '#[#]', this, i));
-      if (length != this.length) {
-        throw new ConcurrentModificationError(this);
-      }
-    }
-  }
-
-  Iterable map(f(E element)) {
-    return IterableMixinWorkaround.mapList(this, f);
-  }
-
-  String join([String separator = ""]) {
-    var list = new List(this.length);
-    for (int i = 0; i < this.length; i++) {
-      list[i] = "${this[i]}";
-    }
-    return JS('String', "#.join(#)", list, separator);
-  }
-
-  Iterable<E> take(int n) {
-    return new IterableMixinWorkaround<E>().takeList(this, n);
-  }
-
-  Iterable<E> takeWhile(bool test(E value)) {
-    return new IterableMixinWorkaround<E>().takeWhile(this, test);
-  }
-
-  Iterable<E> skip(int n) {
-    return new IterableMixinWorkaround<E>().skipList(this, n);
-  }
-
-  Iterable<E> skipWhile(bool test(E value)) {
-    return new IterableMixinWorkaround<E>().skipWhile(this, test);
-  }
-
-  E reduce(E combine(E value, E element)) {
-    return IterableMixinWorkaround.reduce(this, combine);
-  }
-
-  fold(initialValue, combine(previousValue, E element)) {
-    return IterableMixinWorkaround.fold(this, initialValue, combine);
-  }
-
-  E firstWhere(bool test(E value), {E orElse()}) {
-    return IterableMixinWorkaround.firstWhere(this, test, orElse);
-  }
-
-  E lastWhere(bool test(E value), {E orElse()}) {
-    return IterableMixinWorkaround.lastWhereList(this, test, orElse);
-  }
-
-  E singleWhere(bool test(E value)) {
-    return IterableMixinWorkaround.singleWhere(this, test);
-  }
-
-  E elementAt(int index) {
-    return this[index];
-  }
-
-  E get first {
-    if (length > 0) return this[0];
-    throw new StateError("No elements");
-  }
-
-  E get last {
-    if (length > 0) return 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");
-  }
-
-  bool any(bool f(E element)) => IterableMixinWorkaround.any(this, f);
-
-  bool every(bool f(E element)) => IterableMixinWorkaround.every(this, f);
-
-  bool contains(Object other) {
-    for (int i = 0; i < length; i++) {
-      if (this[i] == other) return true;
-    }
-    return false;
-  }
-
-  bool get isEmpty => length == 0;
-
-  bool get isNotEmpty => !isEmpty;
-
-  String toString() => ListBase.listToString(this);
-
-  List<E> toList({ bool growable: true }) {
-    // TODO(vsm): Enforce growable / non-growable.
-    // See: https://github.com/dart-lang/dev_compiler/issues/175
-    return JS('', 'dart.setType(#.slice(), core.List\$(#))', this, E);
-  }
-
-  Set<E> toSet() => new Set<E>.from(this);
-
-  Iterator<E> get iterator => new ListIterator<E>(this);
-
-  int get hashCode => Primitives.objectHashCode(this);
-
-  // BORDER XXXX
-
-  /**
-   * Returns the object at the given [index] in the list
-   * or throws a [RangeError] if [index] is out of bounds.
-   */
-  E operator [](int index) {
-    if (index is !int) throw new ArgumentError(index);
-    if (index >= length || index < 0) throw new RangeError.value(index);
-    return JS('var', '#[#]', this, index);
-  }
-
-  /**
-   * Sets the value at the given [index] in the list to [value]
-   * or throws a [RangeError] if [index] is out of bounds.
-   */
-  void operator []=(int index, E value) {
-    checkMutable('indexed set');
-    if (index is !int) throw new ArgumentError(index);
-    if (index >= length || index < 0) throw new RangeError.value(index);
-    JS('void', r'#[#] = #', this, index, value);
-  }
-
-  /**
-   * Returns the number of objects in this list.
-   *
-   * The valid indices for a list are `0` through `length - 1`.
-   */
-  int get length => JS('JSUInt32', r'#.length', this);
-
-  /**
-   * Changes the length of this list.
-   *
-   * If [newLength] is greater than
-   * the current length, entries are initialized to [:null:].
-   *
-   * Throws an [UnsupportedError] if the list is fixed-length.
-   */
-  void set length(int newLength) {
-    if (newLength is !int) throw new ArgumentError(newLength);
-    if (newLength < 0) throw new RangeError.value(newLength);
-    checkGrowable('set length');
-    JS('void', r'#.length = #', this, newLength);
-  }
-
-  /**
-   * Adds [value] to the end of this list,
-   * extending the length by one.
-   *
-   * Throws an [UnsupportedError] if the list is fixed-length.
-   */
-  void add(E value) {
-    checkGrowable('add');
-    JS('void', r'#.push(#)', this, value);
-  }
-
-  /**
-   * Appends all objects of [iterable] to the end of this list.
-   *
-   * Extends the length of the list by the number of objects in [iterable].
-   * Throws an [UnsupportedError] if this list is fixed-length.
-   */
-  void addAll(Iterable<E> iterable) {
-    for (E e in iterable) {
-      this.add(e);
-    }
-  }
-
-  /**
-   * Returns an [Iterable] of the objects in this list in reverse order.
-   */
-  Iterable<E> get reversed =>
-      new IterableMixinWorkaround<E>().reversedList(this);
-
-  /**
-   * Sorts this list according to the order specified by the [compare] function.
-   *
-   * The [compare] function must act as a [Comparator].
-
-   *     List<String> numbers = ['one', 'two', 'three', 'four'];
-   *     // Sort from shortest to longest.
-   *     numbers.sort((x, y) => x.length.compareTo(y.length));
-   *     numbers.join(', '); // 'one, two, four, three'
-   *
-   * The default List implementations use [Comparable.compare] if
-   * [compare] is omitted.
-   *
-   *     List<int> nums = [13, 2, -11];
-   *     nums.sort();
-         nums.join(', '); // '-11, 2, 13'
-   */
-  void sort([int compare(E a, E b)]) {
-    checkMutable('sort');
-    IterableMixinWorkaround.sortList(this, compare);
-  }
-
-  /**
-   * Shuffles the elements of this list randomly.
-   */
-  void shuffle([Random random]) {
-    IterableMixinWorkaround.shuffleList(this, random);
-  }
-
-  /**
-   * Returns the first index of [element] in this list.
-   *
-   * Searches the list from index [start] to the end of the list.
-   * The first time an object [:o:] is encountered so that [:o == element:],
-   * the index of [:o:] is returned.
-   *
-   *     List<String> notes = ['do', 're', 'mi', 're'];
-   *     notes.indexOf('re');    // 1
-   *     notes.indexOf('re', 2); // 3
-   *
-   * Returns -1 if [element] is not found.
-   *
-   *     notes.indexOf('fa');    // -1
-   */
-  int indexOf(E element, [int start = 0]) {
-    return IterableMixinWorkaround.indexOfList(this, element, start);
-  }
-
-  /**
-   * Returns the last index of [element] in this list.
-   *
-   * Searches the list backwards from index [start] to 0.
-   *
-   * The first time an object [:o:] is encountered so that [:o == element:],
-   * the index of [:o:] is returned.
-   *
-   *     List<String> notes = ['do', 're', 'mi', 're'];
-   *     notes.lastIndexOf('re', 2); // 1
-   *
-   * If [start] is not provided, this method searches from the end of the
-   * list./Returns
-   *
-   *     notes.lastIndexOf('re');  // 3
-   *
-   * Returns -1 if [element] is not found.
-   *
-   *     notes.lastIndexOf('fa');  // -1
-   */
-  int lastIndexOf(E element, [int start]) {
-    return IterableMixinWorkaround.lastIndexOfList(this, element, start);
-  }
-
-  /**
-   * Removes all objects from this list;
-   * the length of the list becomes zero.
-   *
-   * Throws an [UnsupportedError], and retains all objects, if this
-   * is a fixed-length list.
-   */
-  void clear() {
-    length = 0;
-  }
-
-  /**
-   * Inserts the object at position [index] in this list.
-   *
-   * This increases the length of the list by one and shifts all objects
-   * at or after the index towards the end of the list.
-   *
-   * An error occurs if the [index] is less than 0 or greater than length.
-   * An [UnsupportedError] occurs if the list is fixed-length.
-   */
-  void insert(int index, E element) {
-    if (index is !int) throw new ArgumentError(index);
-    if (index < 0 || index > length) {
-      throw new RangeError.value(index);
-    }
-    checkGrowable('insert');
-    JS('void', r'#.splice(#, 0, #)', this, index, element);
-  }
-
-
-  /**
-   * Inserts all objects of [iterable] at position [index] in this list.
-   *
-   * This increases the length of the list by the length of [iterable] and
-   * shifts all later objects towards the end of the list.
-   *
-   * An error occurs if the [index] is less than 0 or greater than length.
-   * An [UnsupportedError] occurs if the list is fixed-length.
-   */
-  void insertAll(int index, Iterable<E> iterable) {
-    checkGrowable('insertAll');
-    IterableMixinWorkaround.insertAllList(this, index, iterable);
-  }
-
-  /**
-   * Overwrites objects of `this` with the objects of [iterable], starting
-   * at position [index] in this list.
-   *
-   *     List<String> list = ['a', 'b', 'c'];
-   *     list.setAll(1, ['bee', 'sea']);
-   *     list.join(', '); // 'a, bee, sea'
-   *
-   * This operation does not increase the length of `this`.
-   *
-   * The [index] must be non-negative and no greater than [length].
-   *
-   * The [iterable] must not have more elements than what can fit from [index]
-   * to [length].
-   *
-   * If `iterable` is based on this list, its values may change /during/ the
-   * `setAll` operation.
-   */
-  void setAll(int index, Iterable<E> iterable) {
-    checkMutable('setAll');
-    IterableMixinWorkaround.setAllList(this, index, iterable);
-  }
-
-  /**
-   * Removes the first occurence of [value] from this list.
-   *
-   * Returns true if [value] was in the list, false otherwise.
-   *
-   *     List<String> parts = ['head', 'shoulders', 'knees', 'toes'];
-   *     parts.remove('head'); // true
-   *     parts.join(', ');     // 'shoulders, knees, toes'
-   *
-   * The method has no effect if [value] was not in the list.
-   *
-   *     // Note: 'head' has already been removed.
-   *     parts.remove('head'); // false
-   *     parts.join(', ');     // 'shoulders, knees, toes'
-   *
-   * An [UnsupportedError] occurs if the list is fixed-length.
-   */
-  bool remove(Object element) {
-    checkGrowable('remove');
-    for (int i = 0; i < this.length; i++) {
-      if (this[i] == value) {
-        JS('var', r'#.splice(#, 1)', this, i);
-        return true;
-      }
-    }
-    return false;
-  }
-
-  /**
-   * Removes the object at position [index] from this list.
-   *
-   * This method reduces the length of `this` by one and moves all later objects
-   * down by one position.
-   *
-   * Returns the removed object.
-   *
-   * The [index] must be in the range `0 ≤ index < length`.
-   *
-   * Throws an [UnsupportedError] if this is a fixed-length list. In that case
-   * the list is not modified.
-   */
-  E removeAt(int index) {
-    if (index is !int) throw new ArgumentError(index);
-    if (index < 0 || index >= length) {
-      throw new RangeError.value(index);
-    }
-    checkGrowable('removeAt');
-    return JS('var', r'#.splice(#, 1)[0]', this, index);
-  }
-
-  /**
-   * Pops and returns the last object in this list.
-   *
-   * Throws an [UnsupportedError] if this is a fixed-length list.
-   */
-  E removeLast() {
-    checkGrowable('removeLast');
-    if (length == 0) throw new RangeError.value(-1);
-    return JS('var', r'#.pop()', this);
-  }
-
-  /**
-   * Removes all objects from this list that satisfy [test].
-   *
-   * An object [:o:] satisfies [test] if [:test(o):] is true.
-   *
-   *     List<String> numbers = ['one', 'two', 'three', 'four'];
-   *     numbers.removeWhere((item) => item.length == 3);
-   *     numbers.join(', '); // 'three, four'
-   *
-   * Throws an [UnsupportedError] if this is a fixed-length list.
-   */
-  void removeWhere(bool test(E element)) {
-    // This could, and should, be optimized.
-    IterableMixinWorkaround.removeWhereList(this, test);
-  }
-
-
-  /**
-   * Removes all objects from this list that fail to satisfy [test].
-   *
-   * An object [:o:] satisfies [test] if [:test(o):] is true.
-   *
-   *     List<String> numbers = ['one', 'two', 'three', 'four'];
-   *     numbers.retainWhere((item) => item.length == 3);
-   *     numbers.join(', '); // 'one, two'
-   *
-   * Throws an [UnsupportedError] if this is a fixed-length list.
-   */
-  void retainWhere(bool test(E element)) {
-    IterableMixinWorkaround.removeWhereList(this,
-                                            (E element) => !test(element));
-  }
-
-  /**
-   * Returns a new list containing the objects from [start] inclusive to [end]
-   * exclusive.
-   *
-   *     List<String> colors = ['red', 'green', 'blue', 'orange', 'pink'];
-   *     colors.sublist(1, 3); // ['green', 'blue']
-   *
-   * If [end] is omitted, the [length] of `this` is used.
-   *
-   *     colors.sublist(1);  // ['green', 'blue', 'orange', 'pink']
-   *
-   * An error occurs if [start] is outside the range `0` .. `length` or if
-   * [end] is outside the range `start` .. `length`.
-   */
-  List<E> sublist(int start, [int end]) {
-    checkNull(start); // TODO(ahe): This is not specified but co19 tests it.
-    if (start is !int) throw new ArgumentError(start);
-    if (start < 0 || start > length) {
-      throw new RangeError.range(start, 0, length);
-    }
-    if (end == null) {
-      end = length;
-    } else {
-      if (end is !int) throw new ArgumentError(end);
-      if (end < start || end > length) {
-        throw new RangeError.range(end, start, length);
-      }
-    }
-    if (start == end) return <E>[];
-    return new JSArray<E>.markGrowable(
-        JS('', r'#.slice(#, #)', this, start, end));
-  }
-
-  /**
-   * Returns an [Iterable] that iterates over the objects in the range
-   * [start] inclusive to [end] exclusive.
-   *
-   * An error occurs if [end] is before [start].
-   *
-   * An error occurs if the [start] and [end] are not valid ranges at the time
-   * of the call to this method. The returned [Iterable] behaves like
-   * `skip(start).take(end - start)`. That is, it does not throw exceptions
-   * if `this` changes size.
-   *
-   *     List<String> colors = ['red', 'green', 'blue', 'orange', 'pink'];
-   *     Iterable<String> range = colors.getRange(1, 4);
-   *     range.join(', ');  // 'green, blue, orange'
-   *     colors.length = 3;
-   *     range.join(', ');  // 'green, blue'
-   */
-  Iterable<E> getRange(int start, int end) {
-    return new IterableMixinWorkaround<E>().getRangeList(this, start, end);
-  }
-
-
-  /**
-   * Copies the objects of [iterable], skipping [skipCount] objects first,
-   * into the range [start], inclusive, to [end], exclusive, of the list.
-   *
-   *     List<int> list1 = [1, 2, 3, 4];
-   *     List<int> list2 = [5, 6, 7, 8, 9];
-   *     // Copies the 4th and 5th items in list2 as the 2nd and 3rd items
-   *     // of list1.
-   *     list1.setRange(1, 3, list2, 3);
-   *     list1.join(', '); // '1, 8, 9, 4'
-   *
-   * The [start] and [end] indices must satisfy `0 ≤ start ≤ end ≤ length`.
-   * If [start] equals [end], this method has no effect.
-   *
-   * The [iterable] must have enough objects to fill the range from `start`
-   * to `end` after skipping [skipCount] objects.
-   *
-   * If `iterable` is this list, the operation will copy the elements originally
-   * in the range from `skipCount` to `skipCount + (end - start)` to the
-   * range `start` to `end`, even if the two ranges overlap.
-   *
-   * If `iterable` depends on this list in some other way, no guarantees are
-   * made.
-   */
-  void setRange(int start, int end, Iterable<E> iterable, [int skipCount = 0]) {
-    checkMutable('set range');
-    IterableMixinWorkaround.setRangeList(this, start, end, iterable, skipCount);
-  }
-
-  /**
-   * Removes the objects in the range [start] inclusive to [end] exclusive.
-   *
-   * The [start] and [end] indices must be in the range
-   * `0 ≤ index ≤ length`, and `start ≤ end`.
-   *
-   * Throws an [UnsupportedError] if this is a fixed-length list. In that case
-   * the list is not modified.
-   */
-  void removeRange(int start, int end) {
-    checkGrowable('removeRange');
-    int receiverLength = this.length;
-    if (start < 0 || start > receiverLength) {
-      throw new RangeError.range(start, 0, receiverLength);
-    }
-    if (end < start || end > receiverLength) {
-      throw new RangeError.range(end, start, receiverLength);
-    }
-    Lists.copy(this,
-               end,
-               this,
-               start,
-               receiverLength - end);
-    this.length = receiverLength - (end - start);
-  }
-
-  /**
-   * Sets the objects in the range [start] inclusive to [end] exclusive
-   * to the given [fillValue].
-   *
-   * An error occurs if [start]..[end] is not a valid range for `this`.
-   */
-  void fillRange(int start, int end, [E fillValue]) {
-    checkMutable('fill range');
-    IterableMixinWorkaround.fillRangeList(this, start, end, fillValue);
-  }
-
-  /**
-   * Removes the objects in the range [start] inclusive to [end] exclusive
-   * and inserts the contents of [replacement] in its place.
-   *
-   *     List<int> list = [1, 2, 3, 4, 5];
-   *     list.replaceRange(1, 4, [6, 7]);
-   *     list.join(', '); // '1, 6, 7, 5'
-   *
-   * An error occurs if [start]..[end] is not a valid range for `this`.
-   */
-  void replaceRange(int start, int end, Iterable<E> replacement) {
-    checkGrowable('removeRange');
-    IterableMixinWorkaround.replaceRangeList(this, start, end, replacement);
-  }
-
-  /**
-   * Returns an unmodifiable [Map] view of `this`.
-   *
-   * The map uses the indices of this list as keys and the corresponding objects
-   * as values. The `Map.keys` [Iterable] iterates the indices of this list
-   * in numerical order.
-   *
-   *     List<String> words = ['fee', 'fi', 'fo', 'fum'];
-   *     Map<int, String> map = words.asMap();
-   *     map[0] + map[1];   // 'feefi';
-   *     map.keys.toList(); // [0, 1, 2, 3]
-   */
-  Map<int, E> asMap() {
-    return new IterableMixinWorkaround<E>().asMapList(this);
-  }
-}