| Index: runtime/lib/string_buffer_patch.dart | 
| diff --git a/runtime/lib/string_buffer_patch.dart b/runtime/lib/string_buffer_patch.dart | 
| index ac700bf3899dce6d6adad32d8802d26c5e9ce918..8fadafaa1259f867a224224f38a8a58969df5692 100644 | 
| --- a/runtime/lib/string_buffer_patch.dart | 
| +++ b/runtime/lib/string_buffer_patch.dart | 
| @@ -43,7 +43,7 @@ patch class StringBuffer { | 
| /* patch */ String toString() { | 
| if (_buffer.length == 0) return ""; | 
| if (_buffer.length == 1) return _buffer[0]; | 
| -    String result = Strings.concatAll(_buffer); | 
| +    String result = _StringBase.concatAll(_buffer); | 
| _buffer.clear(); | 
| _buffer.add(result); | 
| // Since we track the length at each add operation, there is no | 
|  |