test suite failure w/Python 2.7

>>> from guppy import hpy
>>> hpy().test()
imported: guppy.heapy.test.test_dependencies
Testing sets
Test #0
Test #1
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/tmp/xx/local/lib/python2.7/site-packages/guppy/heapy/Use.py", line 359, in test
self._parent.test.test_all.test_main(debug)
File "/tmp/xx/local/lib/python2.7/site-packages/guppy/heapy/test/test_all.py", line 33, in test_main
f(debug=debug)
File "/tmp/xx/local/lib/python2.7/site-packages/guppy/heapy/test/test_dependencies.py", line 9, in test_main
test.test_main()
File "/tmp/xx/local/lib/python2.7/site-packages/guppy/sets/test.py", line 1785, in test_main
test_nums(range(36))
File "/tmp/xx/local/lib/python2.7/site-packages/guppy/sets/test.py", line 1761, in test_nums
f()
File "/tmp/xx/local/lib/python2.7/site-packages/guppy/sets/test.py", line 389, in test1
"""
AssertionError