-----+---------
(0 rows)
+-- pronargdefaults should be 0 iff proargdefaults is null
+SELECT p.oid, p.proname
+FROM pg_proc AS p
+WHERE pronargdefaults <> 0 OR proargdefaults IS NOT NULL;
+ oid | proname
+-----+---------
+(0 rows)
+
-- probin should be non-empty for C functions, null everywhere else
SELECT p1.oid, p1.proname
FROM pg_proc as p1