npfctl_parse_icmp
$$ = npfctl_parse_icmp($<num>0, $2, -1);
$$ = npfctl_parse_icmp($<num>0, $2, $4);
$$ = npfctl_parse_icmp($<num>0, $2,
$$ = npfctl_parse_icmp($<num>0, $2,
npfvar_t * npfctl_parse_icmp(int, int, int);