/usr/lib/python2.5/site-packages/zope/__init__.py:19: UserWarning: Module
twisted was already imported from
/usr/lib/python2.5/site-packages/twisted/__init__.pyc, but
/home/buildslave/tahoe/feisty2.5/build/support/lib/python2.5/site-packages/Nevow-0.9.31-py2.5.egg
is being added to sys.path

Here is an example command line that yields this warning:

http://allmydata.org/buildbot/builders/feisty2.5/builds/1649/steps/pyflakes/logs/stdio

Note that this may be related to issue17 and issue20 -- why is the Nevow egg
declaring the "twisted" namespace and/or module anyway?