Add Iterable.range, List.range and int.to.

sdk/lib/core/int.dart

 // 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 arbitrarily large integer.
  *
  * **Note:** When compiling to JavaScript, integers are
@@ skipping 257 matching lines @@
    * sign, the [onError] is called with the [source] as argument, and its return
    * value is used instead. If no [onError] is provided, a [FormatException]
    * is thrown.
    *
    * The [onError] function is only invoked if [source] is a [String]. It is
    * not invoked if the [source] is, for example, `null`.
    */
   external static int parse(String source,
                             { int radix,
                               int onError(String source) });
+
+  /**
+   * Create an `Iterable<int>` iterating from `this` to `to`, inclusive.
+   *
+   * The iteration starts with `this` as the first value, and then
+   * progresses towards `to` in increments of `step`, and stops when reaching
+   * or overshooting `to`. If it hits `to` the `to` value is included,
+   * otherwise it isn't.
+   *
+   * If `to` is less than `from`, the values are in decreasing order.
+   *
+   * The [step] value must always be positive. It defaults to `1`.
+   *
+   * This is a shorthand for [Iterable.range].
+   */
+  static Iterable<int> to(int to, {int step: 1}) =>
+      return Iterable.range(this, to, step);
 }