Probably don't need an unused re-implementation of addAll(). :)

pkg/analyzer/lib/src/generated/utilities_collection.dart

 // Copyright (c) 2014, 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.
 
 library analyzer.src.generated.utilities_collection;
 
 import 'dart:collection';
 import "dart:math" as math;
 
 import 'package:analyzer/src/generated/java_core.dart';
@@ skipping 448 matching lines @@
         component.add(w);
         _nodeMap[w].component = component;
       } while (!identical(w, v));
       _allComponents.add(component);
     }
     return vInfo;
   }
 }
 
 /**
- * The class `ListUtilities` defines utility methods useful for working with [List
- ].
- */
-class ListUtilities {
-  /**
-   * Add all of the elements in the given array to the given list.
-   *
-   * @param list the list to which the elements are to be added
-   * @param elements the elements to be added to the list
-   */
-  static void addAll(List list, List<Object> elements) {
-    int count = elements.length;
-    for (int i = 0; i < count; i++) {
-      list.add(elements[i]);
-    }
-  }
-}
-
-/**
  * The interface `MapIterator` defines the behavior of objects that iterate over the entries
  * in a map.
  *
  * This interface defines the concept of a current entry and provides methods to access the key and
  * value in the current entry. When an iterator is first created it will be positioned before the
  * first entry and there is no current entry until [moveNext] is invoked. When all of the
  * entries have been accessed there will also be no current entry.
  *
  * There is no guarantee made about the order in which the entries are accessible.
  */
@@ skipping 236 matching lines @@
   /**
    * Map the key to the value.
    *
    * @param key the token being mapped to the value
    * @param value the token to which the key will be mapped
    */
   void put(Token key, Token value) {
     _map[key] = value;
   }
 }