@requires_query_rewrite<EOL><INDENT>def label(self, string):<DEDENT>
if '<STR_LIT>' in string:<EOL><INDENT>raise ValueError("<STR_LIT>")<EOL><DEDENT>return self.extra(where=["<STR_LIT>".format(string)])<EOL>
Adds an arbitrary user-defined comment that will appear after
SELECT/UPDATE/DELETE which can be used to identify where the query was
generated, etc.