[issue19880] unittest: on failure, TestCase.run() keeps a reference to the exception

[STINNER Victor]

STINNER Victor added the comment:

contextmanager_leak2.py: even simpler example, storing a current frame in a local variable of the frame is enough.

generator_workaround.patch is another workaround: call frame.clear() when at generator exit to explicitly break the reference cycle.

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Added file: http://bugs.python.org/file32954/contextmanager_leak2.py

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