isvectordef
if (isvectordef(type, REL_ALIAS)) {
!isvectordef(def->def.ty.old_type,
if (isvectordef (cs->type, cs->rel)) {
if (isvectordef (dflt->type, dflt->rel)) {
if (isvectordef(type, rel)) {
!isvectordef(def->def.ty.old_type,
int isvectordef(const char *type, relation rel);