--- a/tests/tools/check_source.sh	Tue Oct 10 14:01:46 2017 +0300
+++ b/tests/tools/check_source.sh	Tue Oct 10 16:38:57 2017 +0300
@@ -240,6 +240,7 @@
     enable=$enable,E1305          # (too-many-format-args) Too many arguments for format string
     enable=$enable,E0704          # (misplaced-bare-raise) The raise statement is not inside an except clause
     enable=$enable,C0123          # (unidiomatic-typecheck) Using type() instead of isinstance() for a typecheck.
+    enable=$enable,E0601          # (used-before-assignment)
     # enable=
 
     options=