no_opt function RV.POISSON (mu > 0) = gsl_ran_poisson (get_rng (), mu);
// Weirdness.
-absorb_miss boolean function MISSING (x) = x == SYSMIS || !finite (x);
-absorb_miss boolean function SYSMIS (x) = x == SYSMIS || !finite (x);
+absorb_miss boolean function MISSING (x) = x == SYSMIS || !isfinite (x);
+absorb_miss boolean function SYSMIS (x) = x == SYSMIS || !isfinite (x);
no_opt boolean function SYSMIS (num_var v)
case c;
{