[issue45121] Regression in 3.9.7 with typing.Protocol

[Shantanu]

Shantanu <hauntsaninja at gmail.com> added the comment:

As I mentioned in the post, bpo-45081 actually makes this issue worse, since we get a RecursionError.

I think `TypeError: Protocols cannot be instantiated` is probably okay behaviour (as opposed to RecursionError), more just unfortunate that it seems to be an unanticipated breaking change.

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<https://bugs.python.org/issue45121>
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