RUMP_F_FSVOID
#define RUMP__FCNO(c) RUMP__FCN(RUMP_F_FSVOID, (c), 0)
#define RUMP__FCNO_FSPRIV(f, c) RUMP__FCN_FSPRIV(RUMP_F_FSVOID, (f), (c), 0)