Implement getRange (returning an Iterable).

runtime/lib/growable_array.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.
 
 class _GrowableObjectArray<T> implements List<T> {
   factory _GrowableObjectArray._uninstantiable() {
     throw new UnsupportedError(
         "GrowableObjectArray can only be allocated by the VM");
   }
 
@@ skipping 51 matching lines @@
 
   void removeWhere(bool test(T element)) {
     IterableMixinWorkaround.removeWhereList(this, test);
   }
 
   void retainWhere(bool test(T element)) {
     IterableMixinWorkaround.removeWhereList(this,
                                             (T element) => !test(element));
   }
 
+  Iterable<T> getRange(int start, int end) {
+    return IterableMixinWorkaround.getRangeList(this, start, end);
+  }
+
   void setRange(int start, int length, List<T> from, [int startFrom = 0]) {
     IterableMixinWorkaround.setRangeList(this, start, length, from, startFrom);
   }
 
   void removeRange(int start, int length) {
     if (length == 0) {
       return;
     }
     Arrays.rangeCheck(this, start, length);
     Arrays.copy(this,
@@ skipping 30 matching lines @@
     Arrays.indicesCheck(this, start, end);
     if (end == null) end = length;
     int length = end - start;
     if (start == end) return <T>[];
     List list = new _GrowableObjectArray<T>.withCapacity(length);
     list.length = length;
     Arrays.copy(this, start, list, 0, length);
     return list;
   }
 
-  List<T> getRange(int start, int length) => sublist(start, start + length);
-
   factory _GrowableObjectArray(int length) {
     var data = new _ObjectArray((length == 0) ? 4 : length);
     var result = new _GrowableObjectArray<T>.withData(data);
     result._setLength(length);
     return result;
   }
 
   factory _GrowableObjectArray.withCapacity(int capacity) {
     var data = new _ObjectArray((capacity == 0)? 4 : capacity);
     return new _GrowableObjectArray<T>.withData(data);
@@ skipping 209 matching lines @@
   }
 
   Set<T> toSet() {
     return new Set<T>.from(this);
   }
 
   Map<int, T> asMap() {
     return IterableMixinWorkaround.asMapList(this);
   }
 }