Get back into Stackage Nightly with GHC 9.8

[ysangkok]

dhall packages were thrown out because of bound issues:

See relevant section of build-constraints.yml

[ysangkok]

Fixed by

• Port to GHC-9.8.2 (missing: dhall-{lsp-server,nix,nixpkgs}) #2584

[krakrjak]

Bump... Seems it Dhall didn't make the cut for stackage 23.0. I would love to see it make a triumphant return in 23.1 if possible.

[TeofilC]

Hopefully #2602 should have relaxed all the necessary bounds so maybe this is just waiting on a Hackage revision/release?

[ysangkok]

@TeofilC Unfortunately not, as lts-23.0 has Diff-0.5 which is not supported by the revised dhall-1.42.1:

cabal get dhall, cd dhall-1.42.1, stack init --resolver lts-23.0 . reports:

             Diff version 0.5 found
                 - dhall requires >=0.2 && <0.5

Note that the newest version is Diff-1.0.2 which is in Nightly already.

Another issue is special-values, which doesn't support bytestring-0.12.

• bytestring-0.12 not supported minad/special-values#5

Doctests run with cabal repl --with-ghc=doctest also fail. But maybe that's just not the right way to run them? I like that method because it means avoiding environment files and statefulness. Here is an example error:

src/Dhall/Deriving.hs:307: failure in expression `input person "./simon.dhall"'
expected: Person {personName = Name {getName = \"Simon\"}, personFavoriteFont = ComicSans}
 but got: *** Exception:
          ^
          \8627 ./simon.dhall
          
          \ESC[1;31mError\ESC[0m: Missing file ./simon.dhall
          
          1\9474 ./simon.dhall
          
          (input):1:1