text: -- file:opr_sanity.sql ln:504 expect:true
  SELECT p.oid, p.proname, c.oid, c.conname
  FROM pg_proc p, pg_conversion c
  WHERE p.oid = c.conproc AND
      (p.prorettype != 'void'::regtype OR p.proretset OR
       p.pronargs != 5 OR
       p.proargtypes[0] != 'int4'::regtype OR
       p.proargtypes[1] != 'int4'::regtype OR
       p.proargtypes[2] != 'cstring'::regtype OR
       p.proargtypes[3] != 'internal'::regtype OR
       p.proargtypes[4] != 'int4'::regtype)
  