diff -U3 /tmp/cirrus-ci-build/contrib/pg_trgm/expected/pg_trgm.out /tmp/cirrus-ci-build/build/testrun/pg_trgm/regress/results/pg_trgm.out
--- /tmp/cirrus-ci-build/contrib/pg_trgm/expected/pg_trgm.out	2024-03-29 10:06:46.562417000 +0000
+++ /tmp/cirrus-ci-build/build/testrun/pg_trgm/regress/results/pg_trgm.out	2024-03-29 10:24:51.745959000 +0000
@@ -3,6 +3,7 @@
 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)
@@ -4694,6 +4695,7 @@
 create temp table t_test_trgm(t text COLLATE "C");
 create index t_trgm_idx on t_test_trgm using gin (t gin_trgm_ops);
 insert into t_test_trgm values ('qwerty99'), ('qwerty01');
+WARNING:  outfuncs/readfuncs failed to produce an equal rewritten parse tree
 explain (costs off)
 select count(*) from t_test_trgm where t like '%99%' and t like '%qwerty%';
                                  QUERY PLAN                                  
@@ -5353,7 +5355,9 @@
 -- Check similarity threshold (bug #14202)
 CREATE TEMP TABLE restaurants (city text);
 INSERT INTO restaurants SELECT 'Warsaw' FROM generate_series(1, 10000);
+WARNING:  outfuncs/readfuncs failed to produce an equal rewritten parse tree
 INSERT INTO restaurants SELECT 'Szczecin' FROM generate_series(1, 10000);
+WARNING:  outfuncs/readfuncs failed to produce an equal rewritten parse tree
 CREATE INDEX ON restaurants USING gist(city gist_trgm_ops);
 -- Similarity of the two names (for reference).
 SELECT similarity('Szczecin', 'Warsaw');