Change List/Set/Map/Queue.from constructrs to accept any iterable.

sdk/lib/core/iterable.dart

 // Copyright (c) 2011, 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 object that uses an [Iterator] to serve objects one at a time.
  *
  * You can iterate over all objects served by an Iterable object
@@ skipping 38 matching lines @@
    * [:const [0, ..., n - 1].map(generator):]
    */
   factory Iterable.generate(int count, [E generator(int index)]) {
     if (count <= 0) return new EmptyIterable<E>();
     return new _GeneratorIterable<E>(count, generator);
   }
 
   /**
    * Returns a new `Iterator` that allows iterating the elements of this
    * `Iterable`.
+   *
+   * Modifying the underlying data after creating the new iterator
+   * may cause an error the next time [Iterator.moveNext] is called.
    */
   Iterator<E> get iterator;
 
   /**
    * Returns a new lazy [Iterable] with elements that are created by
    * calling `f` on the elements of this `Iterable`.
    *
    * This method returns a view of the mapped elements. As long as the
    * returned [Iterable] is not iterated over, the supplied function [f] will
    * not be invoked. The transformed elements will not be cached. Iterating
@@ skipping 298 matching lines @@
  */
 abstract class BidirectionalIterator<E> implements Iterator<E> {
   /**
    * Move back to the previous element.
    *
    * Returns true and updates [current] if successful. Returns false
    * and sets [current] to null if there is no previous element.
    */
   bool movePrevious();
 }