Make the analyzer happy about collections.

sdk/lib/core/list.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;
 
 /**
  * A [List] is an indexable collection with a length.
  *
  * A `List` implementation can choose not to support all methods
@@ skipping 100 matching lines @@
    */
   E operator [](int index);
 
   /**
    * Sets the entry at the given [index] in the list to [value].
    * Throws an [RangeError] if [index] is out of bounds.
    */
   void operator []=(int index, E value);
 
   /**
+   * Returns the number of elements in the list.
+   *
+   * The valid indices for a list are 0 through `length - 1`.
+   */
+  int get length;
+
+  /**
    * Changes the length of the list. If [newLength] is greater than
    * the current [length], entries are initialized to [:null:]. Throws
    * an [UnsupportedError] if the list is not extendable.
    */
   void set length(int newLength);
 
   /**
    * Adds [value] at the end of the list, extending the length by
    * one. Throws an [UnsupportedError] if the list is not
    * extendable.
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   void insertRange(int start, int length, [E fill]);
 
   /**
    * Returns an unmodifiable [Map] view of `this`.
    *
    * It has the indices of this list as keys, and the corresponding elements
    * as values.
    */
   Map<int, E> asMap();
 }