+int synthetic_reply_method_error(sd_bus_message *call, const sd_bus_error *e);
+int synthetic_reply_method_errorf(sd_bus_message *call, const char *name, const char *format, ...) _sd_printf_(3, 4);
+int synthetic_reply_method_errno(sd_bus_message *call, int error, const sd_bus_error *p);
+int synthetic_reply_method_errnof(sd_bus_message *call, int error, const char *format, ...) _sd_printf_(3, 4);