Eric V. Smith <e...@trueblade.com> added the comment:

Hmm, good point on the inheritance case. I'd forgotten that this is where 
init=False and others would come in handy. Although I'm having a hard time 
figuring out why you'd want a derived class that adds fields but wants to use 
the parent's __match_args__ (or __init__, for that matter), but I guess it's 
possible.

I don't like del Child.__match_args__. The same pattern could be used for 
init=False, after all, but there's a parameter for that.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43764>
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