diff -U3 /home/buildfarm/trilobite/buildroot/HEAD/pgsql.build/src/test/isolation/expected/detach-partition-concurrently-4.out /home/buildfarm/trilobite/buildroot/HEAD/pgsql.build/src/test/isolation/output_iso/results/detach-partition-concurrently-4.out
--- /home/buildfarm/trilobite/buildroot/HEAD/pgsql.build/src/test/isolation/expected/detach-partition-concurrently-4.out	2021-03-29 20:14:21.258199311 +0200
+++ /home/buildfarm/trilobite/buildroot/HEAD/pgsql.build/src/test/isolation/output_iso/results/detach-partition-concurrently-4.out	2021-03-30 18:54:34.272839428 +0200
@@ -324,6 +324,7 @@
 1              
 2              
 step s1insert: insert into d4_fk values (1);
+ERROR:  insert or update on table "d4_fk" violates foreign key constraint "d4_fk_a_fkey"
 step s1c: commit;
 
 starting permutation: s2snitch s1b s1s s2detach s1cancel s3vacfreeze s1s s1insert s1c