__attribute__ ((__format__ (__printf__, 4, 5)));
+/** Report an obsolete syntax, suggest the updated one. */
+void deprecated_directive (location const *loc,
+ char const *obsolete, char const *updated);
+
/** Warnings treated as errors shouldn't stop the execution as regular errors
should (because due to their nature, it is safe to go on). Thus, there are
three possible execution statuses. */