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Implement variance checks for recursive protocols. #3828

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ilevkivskyi opened this issue Aug 15, 2017 · 0 comments
Open

Implement variance checks for recursive protocols. #3828

ilevkivskyi opened this issue Aug 15, 2017 · 0 comments
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feature priority-1-normal topic-protocols topic-recursive-types

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@ilevkivskyi
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Currently, only non-recursive protocols are well tested w.r.t. declared vs inferred variance. It looks like a set of mutually recursive protocols should be checked as a unit, since the variance in one protocol can affect variance in another protocol.

This is a follow up for #3132
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@gvanrossum @ilevkivskyi @AlexWaygood