Hey, > Indeed, that seems to work for those packages, but it still doesn't seem to work for OneTuple, as mentioned here: I’m attaching a patch for that, please have a look. I’ll merge these into master, since they don’t change any builds. > Aha! The upgrade to GHC 9.0.0 caused ghc-hashable to break. I suppose many other packages could be broken as well. I didn’t actually upgrade any packages on wip-haskell yet, so it’s likely they fail with a newer GHC than 8.10. Cheers, Lars