MyPy released support for PEP 695 generics: python/mypy#15238

It would be awesome to do any of the following:

1. get linting errors for code that uses older style generics (TypeVar, ParamSpec etc.) for Python 3.12+
2. get linting errors for code that uses newer style generics and should be backward compatible with lower Python versions
3. automagically upgrade older style generics to use the new syntax

I see that for point 3 there is an open related issue. This issue is about the underlying rust implementation for point 3, but does not cover points 1 and 2.