STINNER Victor added the comment:

unittest_leak.patch: Fix the the initial bug, unittest_leak.py.

I don't think that it's possible to write a generic fix for frame_ref_cycle.py. 
Storing sys.exc_info() to format it as a traceback later is a common pattern. 
Clearing a frame at function exit breaks this use case.

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nosy: +ezio.melotti
Added file: http://bugs.python.org/file32957/unittest_leak.patch

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<http://bugs.python.org/issue19880>
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