Reduce duplication of code between typing and typing_extensions
#7075
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According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉 |
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Following #7037, we now (ab)use the fact that
Protocolis defined unconditionally intyping.pyias a means to avoid redefiningProtocolintyping_extensions(we just re-export it fromtyping). This means that we no longer have to define_ProtocolMetaintyping_extensions, since its only purpose is to define theProtocolclass.We can also import the definition of_SpecialFormfromtyping, which should help stop them getting out of sync in the future (they are already out of sync now).^Seems like importing
_SpecialFormbreaks pytype, unfortunately.