dname_concatenate
const dname_type *dname_concatenate(region_type *region,
dname=dname_concatenate(region, dname, domain_dname(zone->apex));
wcard = dname_concatenate(tmpregion, wcard, dname);
name = dname_concatenate(parser->rr_region, name,
dname_concatenate(
$$ = dname_concatenate(parser->rr_region, $1, $3);