[issue34042] Reference loss for local classes

[Antoine Pitrou]

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

I've bisected myself and the culprit seems to be b0a7a037b8fde56b62f886d5188bced7776777b4 ("""bpo-31179: Make dict.copy() up to 5.5 times faster.""").

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nosy: +yselivanov

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34042>
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