[issue1545463] New-style classes fail to cleanup attributes

[Roundup Robot]

Roundup Robot added the comment:

New changeset f0833e6ff2d2 by Antoine Pitrou in branch 'default':
Issue #1545463: Global variables caught in reference cycles are now garbage-collected at shutdown.
http://hg.python.org/cpython/rev/f0833e6ff2d2

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nosy: +python-dev

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