NS_ENSURE_TRUE(rv, rv);
if (NS_FAILED(rv)) return rv;
nsTextNode::CloneNode(PRBool aDeep, nsIDOMNode** aReturn){  nsCOMPtr<nsITextContent> textContent;  nsresult rv = CloneContent(PR_TRUE, getter_AddRefs(textContent));  NS_ENSURE_TRUE(rv, rv);  return CallQueryInterface(textContent, aReturn);}