Could not find module ‘Language.Haskell.TH.Datatype.TyVarBndr’

[ocharles]

I'm getting

src/TH/Utilities.hs:16:1: error:

    Could not find module ‘Language.Haskell.TH.Datatype.TyVarBndr’

    Perhaps you meant

      Language.Haskell.TH.Datatype.Internal

      Language.Haskell.TH.Datatype (from th-abstraction-0.3.2.0)

    Use -v (or `:set -v` in ghci) to see a list of the files searched for.

when trying to build 0.2.4.2 on GHC 8.10.3. I have a feeling 0.2.4.2 now only works on GHC 9.

[mgsloan]

Hmm, how are you building it? That module is provided by the th-abstraction package, a dependency which was added in 574882e . Perhaps the cabal file needs to be regenerated from the package.yaml?

…

On Tue, Apr 6, 2021 at 3:19 AM Ollie Charles ***@***.***> wrote: I'm getting src/TH/Utilities.hs:16:1: error: Could not find module ‘Language.Haskell.TH.Datatype.TyVarBndr’ Perhaps you meant Language.Haskell.TH.Datatype.Internal Language.Haskell.TH.Datatype (from th-abstraction-0.3.2.0) Use -v (or `:set -v` in ghci) to see a list of the files searched for. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#15>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAFQKUD4G6VA62O4L6VKNLTHLG2PANCNFSM42OKZWOA> .

[ocharles]

It was only added in https://hackage.haskell.org/package/th-abstraction-0.4.0.0 and there are no bounds specified, so I imagine I was trying to build with an older th-abstraction. I just tried adding constraint: th-abstraction ^>= 0.4.0.0 to my cabal.project, but that's not a valid plan. Maybe it's worth adding some minimum bounds?

[mgsloan]

Ah, I see! I've added the lower bound constraint in a hackage revision and in version 0.2.4.3

I suppose it is not a valid plan because of some upper bounds that can presumably be loosened? https://packdeps.haskellers.com/reverse/th-abstraction