diff -U3 /tmp/cirrus-ci-build/contrib/ltree/expected/ltree.out /tmp/cirrus-ci-build/build/testrun/ltree/regress/results/ltree.out
--- /tmp/cirrus-ci-build/contrib/ltree/expected/ltree.out	2024-03-27 22:35:12.767209000 +0000
+++ /tmp/cirrus-ci-build/build/testrun/ltree/regress/results/ltree.out	2024-03-27 22:53:18.543050000 +0000
@@ -5,6 +5,7 @@
 SELECT amname, opcname
 FROM pg_opclass opc LEFT JOIN pg_am am ON am.oid = opcmethod
 WHERE opc.oid >= 16384 AND NOT amvalidate(opc.oid);
+WARNING:  outfuncs/readfuncs failed to produce an equal rewritten parse tree
  amname | opcname 
 --------+---------
 (0 rows)
@@ -1442,6 +1443,7 @@
        ('0.1.2'::ltree), ('0'::ltree), ('0_asd.1_ASD'::ltree)) x(v)
 WHERE  hash_ltree(v)::bit(32) != hash_ltree_extended(v, 0)::bit(32)
        OR hash_ltree(v)::bit(32) = hash_ltree_extended(v, 1)::bit(32);
+WARNING:  outfuncs/readfuncs failed to produce an equal rewritten parse tree
  value | standard | extended0 | extended1 
 -------+----------+-----------+-----------
 (0 rows)
@@ -7879,6 +7881,7 @@
 SELECT count(*) FROM (
 SELECT t FROM (SELECT * FROM ltreetest UNION ALL SELECT * FROM ltreetest) t1 GROUP BY t
 ) t2;
+WARNING:  outfuncs/readfuncs failed to produce an equal rewritten parse tree
                      QUERY PLAN                      
 -----------------------------------------------------
  Aggregate
@@ -7892,6 +7895,7 @@
 SELECT count(*) FROM (
 SELECT t FROM (SELECT * FROM ltreetest UNION ALL SELECT * FROM ltreetest) t1 GROUP BY t
 ) t2;
+WARNING:  outfuncs/readfuncs failed to produce an equal rewritten parse tree
  count 
 -------
   1006
@@ -8188,6 +8192,7 @@
              ('!tree & aWdf@*','ltxtquery'))
       AS a(str,typ),
      LATERAL pg_input_error_info(a.str, a.typ) as errinfo;
+WARNING:  outfuncs/readfuncs failed to produce an equal rewritten parse tree
      value      |   type    | ok | sql_error_code |              message               |          detail          | hint 
 ----------------+-----------+----+----------------+------------------------------------+--------------------------+------
  .2.3           | ltree     | f  | 42601          | ltree syntax error at character 1  |                          |