[issue13521] Make dict.setdefault() atomic

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Do you have any idea, how I might this part? I mean how to check, that
> this is called only once?

Checking that __eq__ is called only once should be a good proxy.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13521>
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