_xml_failure
_xml_failure(parser, __FILE__, __LINE__);
_xml_failure(g_parser, file, lineno);
_xml_failure(g_parser, file, line);
_xml_failure(g_parser, file, line);
_xml_failure(g_parser, file, line);
extern void _xml_failure(XML_Parser parser, const char *file, int line);
# define xml_failure(parser) _xml_failure((parser), __FILE__, __LINE__)