Message 394000 - Python tracker

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I can reproduce it outside of tox using:

venv\Scripts\pip install flake8==3.6.0
venv\Scripts\pip install -e . --no-deps  # ignore the conflict, but fix pyflakes

C:\Users\asott\AppData\Local\Temp\y\pyflakes>venv\Scripts\flake8.exe setup.py

C:\Users\asott\AppData\Local\Temp\y\pyflakes>echo %ERRORLEVEL%
-1073741819