Getting nose to NOT discover setup module?

[Roy Smith]

I've got a directory tree that looks like:

$ find . -name '*.py' -ls

1315965    4 -rw-rw-r--   1 roy      roy            16 May 25 23:09 ./foo/__init__.py

1445517    4 -rw-rw-r--   1 roy      roy            16 May 25 23:09 ./foo/setup/__init__.py

When I run nosetests at the top level, it discovers foo/setup and tries to run it:

$ nosetests

E

======================================================================

ERROR: test suite for <module 'foo' from '/home/roy/play/nose/foo/__init__.pyc'>

----------------------------------------------------------------------

Traceback (most recent call last):

  File "/home/roy/production/python/local/lib/python2.7/site-packages/nose/suite.py", line 208, in run

    self.setUp()

  File "/home/roy/production/python/local/lib/python2.7/site-packages/nose/suite.py", line 291, in setUp

    self.setupContext(ancestor)

  File "/home/roy/production/python/local/lib/python2.7/site-packages/nose/suite.py", line 314, in setupContext

    try_run(context, names)

  File "/home/roy/production/python/local/lib/python2.7/site-packages/nose/util.py", line 464, in try_run

    (name, obj))

TypeError: Attribute setup of <module 'foo' from '/home/roy/play/nose/foo/__init__.pyc'> is not a python function. Only functions or callables may be used as fixtures.

----------------------------------------------------------------------

Ran 0 tests in 0.002s

FAILED (errors=1)

How can I prevent it from doing this?  I've tried various combinations of __test__ = False in foo/__init__.py and foo/setup/__init__.py, with no effect.  I'm running nose 1.3.0.