Wrote functions to convert collections and maps to strings and invoked

runtime/lib/array.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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 ListFactory<E> {
 
   factory List.from(Iterable<E> other) {
     GrowableObjectArray<E> list = new GrowableObjectArray<E>();
     for (final e in other) {
       list.add(e);
     }
@@ skipping 12 matching lines @@
 // TODO(srdjan): Use shared array implementation.
 class ObjectArray<E> implements List<E> {
 
   factory ObjectArray(int length) native "ObjectArray_allocate";
 
   E operator [](int index) native "ObjectArray_getIndexed";
 
   void operator []=(int index, E value) native "ObjectArray_setIndexed";
 
   String toString() {
-    return Arrays.asString(this);
+    return Collections.collectionToString(this);
   }
 
   int get length() native "ObjectArray_getLength";
 
   void copyFrom(List src, int srcStart, int dstStart, int count) {
     if (src is ObjectArray) {
       _copyFromObjectArray(src, srcStart, dstStart, count);
     } else {
       Arrays.copy(src, srcStart, this, dstStart, count);
     }
@@ skipping 186 matching lines @@
   bool isEmpty() {
     return this.length === 0;
   }
 
   void sort(int compare(E a, E b)) {
     throw const UnsupportedOperationException(
         "Cannot modify an immutable array");
   }
 
   String toString() {
-    return Arrays.asString(this);
+    return Collections.collectionToString(this);
   }
 
   int indexOf(E element, [int start = 0]) {
     return Arrays.indexOf(this, element, start, this.length);
   }
 
   int lastIndexOf(E element, [int start = null]) {
     if (start === null) start = length - 1;
     return Arrays.lastIndexOf(this, element, start);
   }
@@ skipping 52 matching lines @@
     if (!hasNext()) {
       throw const NoMoreElementsException();
     }
     return _array[_pos++];
   }
 
   final List<E> _array;
   final int _length;  // Cache array length for faster access.
   int _pos;
 }