[issue44589] Pattern Matching - duplicate keys in mapping patterns

[Jack DeVries]

Jack DeVries <jdevries3133 at gmail.com> added the comment:

@brandtbucher, I'm sorry for the miscommunication. I started working on this patch at the beginning of the week after message 397215... I'm a new contributor too, and I wasn't sure if I would be able to make something that worked, so I just kept my mouth shut. Then, all of a sudden, it came together and I had a (mostly) working patch.

I'm going to incorporate your review now; thank you for the feedback, and I'm very sorry for any toes I may have stepped on.

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<https://bugs.python.org/issue44589>
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