Move toString() to collection classes.

sdk/lib/collection/list.dart

Index: sdk/lib/collection/list.dart
diff --git a/sdk/lib/collection/list.dart b/sdk/lib/collection/list.dart
index 5c81ae761efd5c7f9eceebfe1146765ae570ea22..7b4a074b7eebb2e4399a3f9b736fcd0784122a01 100644
--- a/sdk/lib/collection/list.dart
+++ b/sdk/lib/collection/list.dart
@@ -28,6 +28,9 @@ typedef ListBase<E> = Object with ListMixin<E>;
  * mixin to prevent all modifications.
  */
 abstract class ListMixin<E> implements List<E> {
+  // A list to identify cyclic lists during toString() calls. 
+  static List _toStringList = new List();
+  
   // Iterable interface.
   Iterator<E> get iterator => new ListIterator<E>(this);
 
@@ -477,5 +480,22 @@ abstract class ListMixin<E> implements List<E> {
 
   Iterable<E> get reversed => new ReversedListIterable(this);
 
-  String toString() => ToString.iterableToString(this);
+  String toString() {
+    for (int i = 0; i < _toStringList.length; i++) {
+      if (identical(_toStringList[i], this)) { return '[...]'; }
+    }
+
+    var result = new StringBuffer();
+    try {
+      _toStringList.add(this);
+      result.write('[');
+      result.writeAll(this, ', ');
+      result.write(']');
+     } finally {
+       assert(identical(_toStringList.last, this));
+       _toStringList.removeLast();  
+     }
+     
+    return result.toString();
+  }
 }