Parsed test spec with 3 sessions

starting permutation: s2_begin s2_snap s1_update s1_index s1_check s2_plain s2_sp s2_old s2_back s2_new s2_back s2_commit s3_new
step s2_begin: BEGIN ISOLATION LEVEL REPEATABLE READ;
step s2_snap: SELECT id, d FROM bm_cx;
id|d              
--+---------------
 1|'doc':2 'old':1
(1 row)

step s1_update: UPDATE bm_cx SET d = to_tsvector('simple', 'new doc');
step s1_index: CREATE INDEX bm_cx_d ON bm_cx USING lion (d) WITH (store_positions = true);
step s1_check: SELECT indisvalid, indisready, indcheckxmin
					FROM pg_index WHERE indexrelid = 'bm_cx_d'::regclass;
indisvalid|indisready|indcheckxmin
----------+----------+------------
t         |t         |t           
(1 row)

step s2_plain: SELECT id FROM bm_cx WHERE d @@ 'old';
id
--
 1
(1 row)

step s2_sp: SAVEPOINT p;
step s2_old: SELECT t.id FROM lion_bm25('bm_cx_d', 'old', 10) s JOIN bm_cx t ON t.ctid = s.ctid;
ERROR:  cannot rank through index "bm_cx_d" because it was built from a broken HOT chain (indcheckxmin) and cannot be used by this transaction's snapshot
step s2_back: ROLLBACK TO p;
step s2_new: SELECT t.id FROM lion_bm25('bm_cx_d', 'new', 10) s JOIN bm_cx t ON t.ctid = s.ctid;
ERROR:  cannot rank through index "bm_cx_d" because it was built from a broken HOT chain (indcheckxmin) and cannot be used by this transaction's snapshot
step s2_back: ROLLBACK TO p;
step s2_commit: COMMIT;
step s3_new: SELECT t.id, t.d FROM lion_bm25('bm_cx_d', 'new', 10) s JOIN bm_cx t ON t.ctid = s.ctid;
id|d              
--+---------------
 1|'doc':2 'new':1
(1 row)