[issue1062277] Pickle breakage with reduction of recursive structures

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

As I explained in msg110617 under issue9269, it is possible that we can do better than simply detect reduce cycles and bail out.

I am torn between two options:

1. Reject this patch and wait until a proper solution is found.

2. Admit that better is the enemy of good and start with proper error reporting on reduce cycles by accepting this patch.

My only concern about this patch is that it is likely to affect performance because pickling will have to maintain the "reducing_now" dictionary that is parallel to the memo dictionary.

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superseder:  -> Cannot pickle self-referencing sets

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<http://bugs.python.org/issue1062277>
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