bug in 7.4 SET WITHOUT OIDs

I had a suspicion and it was confirmed:

test=# create table oidtest (a int4, unique(oid));
NOTICE:  CREATE TABLE / UNIQUE will create implicit index 
"oidtest_oid_key" for table "oidtest"
CREATE TABLE
test=# select oid from oidtest; oid
-----
(0 rows)

test=# alter table oidtest set without oids;
ALTER TABLE
test=# select oid from oidtest;
ERROR:  column "oid" does not exist
test=# \d oidtest
ERROR:  cache lookup failed for attribute -2 of relation 765798


Chris