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	2024-03-21 16:29:25.567439000 +0000
+++ /tmp/cirrus-ci-build/build/testrun/ltree/regress/results/ltree.out	2024-03-21 16:47:57.924399000 +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)
@@ -8120,6 +8121,7 @@
              ('!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  |                          |