makenl
struct namelist *makenl();
nl = makenl(NULL);
$$ = makenl($1);
$$ = last_n = makenl($2);
last_n->n_next = makenl($2);
value = makenl(cp);
value = nl = makenl(cp);
nl->n_next = makenl(cp);
nl = makenl(args[i]);