Doesn't play well with 9.0.1

[Tritlo]

After the reorganization of the GHC internals, some essential functions are no longer exported. A fix is being worked on (https://gitlab.haskell.org/ghc/ghc/-/issues/19864), but we'll have to wait until 9.0.2.

[Tritlo]

The merge request has been approved, so now we only need to wait for 9.0.2 and it's release!

https://gitlab.haskell.org/ghc/ghc/-/merge_requests/5784

[lapplislazuli]

On a Sidenote, do we currently have restrictions in place which Haskell-Code-Versions are supported?

So, if we go with 9.0.2 can we repair code written for 8.X ?

If not this is somewhat a design decision, idk how eagerly Haskellers will version bump

[Tritlo]

Well, we compile code with the same version we target. But it works with 8.8 and 8.10 I think, and then 9.0.2, but not 9.0.1 haha