Alexander Belopolsky <belopol...@users.sourceforge.net> added the comment:

Looks like a stack overflow caused by an infinite recursion.  I am not sure if 
it is possible to add cycle detection code without sacrificing performance or 
setting some arbitrary limits.

I wonder: Why ast nodes need to be mutable?

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nosy: +belopolsky

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue11105>
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