diff -U3 /home/nm/src/pg/vp/3stub/src/pl/plpython/expected/python3/plpython_stub.out /home/nm/src/pg/vp/3stub/src/pl/plpython/results/python3/plpython_stub.out
--- /home/nm/src/pg/vp/3stub/src/pl/plpython/expected/python3/plpython_stub.out	2020-05-28 01:01:35.445842589 -0700
+++ /home/nm/src/pg/vp/3stub/src/pl/plpython/results/python3/plpython_stub.out	2020-05-28 01:01:37.765861474 -0700
@@ -50,22 +50,33 @@
 
 call convert_python3_all();
 NOTICE:  converting function convert1()
-NOTICE:  converting function convert2()
+ERROR:  subprocess.CalledProcessError: Command '2to3  --no-diffs -w /tmp/tmpvmbr920w/temp.py' returned non-zero exit status 127.
+CONTEXT:  Traceback (most recent call last):
+  PL/Python function "convert_python3_all", line 42, in <module>
+    subprocess.check_call(tool + " " + options + " --no-diffs -w " + tmpdirname + "/temp.py", shell=True)
+  PL/Python function "convert_python3_all", line 310, in check_call
+PL/Python procedure "convert_python3_all"
 \sf convert1()
 CREATE OR REPLACE FUNCTION public.convert1()
  RETURNS integer
- LANGUAGE plpython3u
+ LANGUAGE plpython2u
  IMMUTABLE
-AS $function$return 123$function$
+AS $function$return 123l$function$
 \sf convert2()
 CREATE OR REPLACE FUNCTION public.convert2()
  RETURNS integer
- LANGUAGE plpython3u
+ LANGUAGE plpythonu
  IMMUTABLE
-AS $function$return 123$function$
+AS $function$return 123l$function$
 -- clean up
 DROP EXTENSION
 plpython2u;
+ERROR:  cannot drop extension plpython2u because other objects depend on it
+DETAIL:  function convert1() depends on language plpython2u
+HINT:  Use DROP ... CASCADE to drop the dependent objects too.
 DROP EXTENSION
 plpythonu;
+ERROR:  cannot drop extension plpythonu because other objects depend on it
+DETAIL:  function convert2() depends on language plpythonu
+HINT:  Use DROP ... CASCADE to drop the dependent objects too.
 DROP EXTENSION convert_python3;