diff -r 410a3bcbeb29 -r c4ba411f8c89 tests/tools/check_source.sh
--- a/tests/tools/check_source.sh	Tue Oct 10 13:49:13 2017 +0300
+++ b/tests/tools/check_source.sh	Tue Oct 10 14:01:46 2017 +0300
@@ -239,6 +239,7 @@
     enable=$enable,C0413          # (wrong-import-position) Import "import X" should be placed at the top of the module
     enable=$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=
 
     options=