Version 0.3.7.4

dart/sdk/lib/_internal/compiler/implementation/lib/core_patch.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.
 
 // Patch file for dart:core classes.
 
 import 'dart:_interceptors';
 import 'dart:_js_helper' show checkNull,
                               getRuntimeTypeString,
                               isJsArray,
@@ skipping 226 matching lines @@
                           multiLine: multiLine,
                           caseSensitive: caseSensitive);
 }
 
 // Patch for 'identical' function.
 patch bool identical(Object a, Object b) {
   return Primitives.identicalImplementation(a, b);
 }
 
 patch class StringBuffer {
-  patch factory StringBuffer([Object content = ""]) {
-    return new JsStringBuffer(content);
+  String _contents = "";
+
+  patch StringBuffer([Object content = ""]) {
+    if (content is String) {
+      _contents = content;
+    } else {
+      write(content);
+    }
   }
+
+  patch int get length => _contents.length;
+
+  patch void write(Object obj) {
+    String str = obj is String ? obj : "$obj";
+    _contents = Primitives.stringConcatUnchecked(_contents, str);
+  }
+
+  patch void clear() {
+    _contents = "";
+  }
+
+  patch String toString() => _contents;
 }