[issue44796] Add __parameters__ and __getitem__ in TypeVar and ParamSpec

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

There is also similar bug in Generic:

>>> from typing import *
>>> T = TypeVar("T")
>>> P = ParamSpec("P")
>>> class X(Generic[T, P]):
...     f: Callable[P, int]
...     x: T
... 
>>> P_2 = ParamSpec("P_2")
>>> X[int, P_2, str]
__main__.X[int, ~P_2]

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44796>
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