Nick Coghlan <ncogh...@gmail.com> added the comment:

Another use case for a writeable __closure__ attribute is to make it possible 
to manually break reference cycles:
http://blog.ccpgames.com/kristjan/2012/04/23/reference-cycles-with-closures/

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14369>
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