[issue40494] collections.abc.Callable and type variables

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

>From https://bugs.python.org/issue42195 it looks like we need to create a subclass just for Callable. See https://bugs.python.org/issue42102 and PR 22848.

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