[issue10241] gc fixes for module m_copy attribute

[Antoine Pitrou]

Antoine Pitrou added the comment:

I backed out the changeset in time for the Alpha 1 release.
Further investigation should perhaps be made on the tkinter issue, but it's a bit cumbersome: you need a full test run in non-parallel mode to exhibit the segfault.

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stage: committed/rejected -> 

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<http://bugs.python.org/issue10241>
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