Add forgotten import.

whitequark · whitequark · commit a21205af3858 · 2015-06-06T17:27:13.000+03:00
diff --git a/pythonparser/diagnostic.py b/pythonparser/diagnostic.py
@@ -5,6 +5,7 @@
 
 from __future__ import absolute_import, division, print_function, unicode_literals
 from functools import reduce
+import sys
 
 class Diagnostic:
     """
