Ken Jin <kenjin4...@gmail.com> added the comment:

Now that issue42195 has been resolved by subclassing types.GenericAlias, can 
this be closed?

On 3.9 and 3.10:

>>> import typing, collections.abc
>>> T = typing.TypeVar('T')
>>> C2 = collections.abc.Callable[[T], T]
>>> C2[int]
collections.abc.Callable[[int], int]

It seems to be fixed :).

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nosy: +kj

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<https://bugs.python.org/issue40494>
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