=# CREATETABLE with_pk (i integerPRIMARYKEY);CREATETABLE
=# BEGIN;BEGIN=# INSERTINTO with_pk VALUES (1) ON CONFLICT DO NOTHING;INSERT01=# INSERTINTO with_pk VALUES (1) ON CONFLICT DO NOTHING;INSERT00=# END;COMMIT
=# BEGIN;BEGIN=# INSERTINTO with_pk VALUES (2), (2) ON CONFLICT DO NOTHING;
ERROR: could not serialize access due to concurrent update=# END;ROLLBACK