int synthetic_reply_method_return(sd_bus_message *call, const char *types, ...);
int synthetic_reply_method_return_strv(sd_bus_message *call, char **l);
int synthetic_reply_method_error(sd_bus_message *call, const sd_bus_error *e);
int synthetic_reply_method_return(sd_bus_message *call, const char *types, ...);
int synthetic_reply_method_return_strv(sd_bus_message *call, char **l);
int synthetic_reply_method_error(sd_bus_message *call, const sd_bus_error *e);