Hierarchy of cats effect in Cats documentation does not match the one in the cats effect docs

[nmichael44]

The picture under the text "Type classes in Cats" here: https://github.com/typelevel/cats/blob/main/docs/typeclasses.md

seems to suggest that Concurrent is a subclass of Async, but here:

https://typelevel.org/cats-effect/docs/typeclasses

exactly the opposite is suggested. Looking at the actual code suggests that the documentation in Cats is incorrect.

[satorg]

Yes, the former diagram represents the state of Cats along with Cats-Effect v2, where the hierarchy was slightly different.
IIRC, there were attempts to re-render the diagram and even some draft PRs were created, but the work has not been completed yet.

[kubukoz]

cats-mtl is also heavily outdated there 😅

[rossabaker]

Someone just needs to finish #4374 ?