RUMP__FCN
#define RUMP__FCNO(c) RUMP__FCN(RUMP_F_FSVOID, (c), 0)
#define RUMP__FCNR(c, t) RUMP__FCN(RUMP_F_FSIN, (c), (int)sizeof(t))
#define RUMP__FCNW(c, t) RUMP__FCN(RUMP_F_FSOUT, (c), (int)sizeof(t))
#define RUMP__FCNRW(c, t) RUMP__FCN(RUMP_F_FSINOUT, (c), (int)sizeof(t))