Support PEP 646 - Variadic Generics

[rchen152]

https://peps.python.org/pep-0646/

[AlexWaygood]

As a first step, would it maybe be possible to have pytype gracefully fallback to Any if it sees Unpack[] being used in a type annotation? Currently using Unpack[] anywhere seems to make pytype crash, which is blocking a couple of typeshed PRs (python/typeshed#11015, python/typeshed#11014).

No worries if this is difficult to do, though; there's no great rush here in getting those typeshed PRs merged!

[rchen152]

I can certainly give it a try.

[rchen152]

Sorry, it took me a while to get to this. But I should be able to cut a release with a fix for the Unpack crash tomorrow or early next week.

[AlexWaygood]

No worries at all -- thanks so much!

[rchen152]

Ok, version 2023.12.8 has the Unpack fix =)

[AlexWaygood]

Ok, version 2023.12.8 has the Unpack fix =)

Thank you so much — both the typeshed changes have been merged now <3