anchor.diff:  part of mustache;
  +
  +final Object _NO_SUCH_PROPERTY = new Object();
   
   final RegExp _validTag = new RegExp(r'^[0-9a-zA-Z\_\-\.]+$');
   
  
positive.code: 		_sink = sink;
  		_htmlEscapeValues = htmlEscapeValues;
  		_stack.clear();
  		_stack.add(values);	
  		_root.children.forEach(_renderNode);
  		_sink = null;
  	}
  
negative.code: 			}
  
  			stack.removeLast();
  
  		} else if (t.type == _COMMENT) {
  			// Do nothing
  
  