gen_ncode
struct block *gen_ncode(const char *, bpf_u_int32, struct qual);
| pnum { $$.b = gen_ncode(NULL, (bpf_u_int32)$1,
$$.b = gen_ncode($1, 0, $$.q);
$$.b = gen_ncode($1, 0, $$.q);
qid: pnum { $$.b = gen_ncode(NULL, (bpf_u_int32)$1,