Doesn't compile with GHC 9.2.3

[Mikolaj]

Fails with

~$ cabal install stylish-haskell
Resolving dependencies...
Build profile: -w ghc-9.2.3 -O1
In order, the following will be built (use -v for more details):
 - stylish-haskell-0.14.2.0 (lib) (requires build)
 - stylish-haskell-0.14.2.0 (exe:stylish-haskell) (requires build)
Starting     stylish-haskell-0.14.2.0 (lib)
Building     stylish-haskell-0.14.2.0 (lib)

Failed to build stylish-haskell-0.14.2.0.
Build log (
/home/mikolaj/.cabal/logs/ghc-9.2.3/stylish-haskell-0.14.2.0-b54ac8d49070c15bc96bb1ea4cb38bcc1ab66990033c8c3a3f41c50a1f1f94c5.log
):
Configuring library for stylish-haskell-0.14.2.0..
Preprocessing library for stylish-haskell-0.14.2.0..
Building library for stylish-haskell-0.14.2.0..
[ 1 of 26] Compiling Language.Haskell.Stylish.Block ( lib/Language/Haskell/Stylish/Block.hs, dist/build/Language/Haskell/Stylish/Block.o, dist/build/Language/Haskell/Stylish/Block.dyn_o )
[ 2 of 26] Compiling Language.Haskell.Stylish.Config.Internal ( lib/Language/Haskell/Stylish/Config/Internal.hs, dist/build/Language/Haskell/Stylish/Config/Internal.o, dist/build/Language/Haskell/Stylish/Config/Internal.dyn_o )
[ 3 of 26] Compiling Language.Haskell.Stylish.Editor ( lib/Language/Haskell/Stylish/Editor.hs, dist/build/Language/Haskell/Stylish/Editor.o, dist/build/Language/Haskell/Stylish/Editor.dyn_o )
[ 4 of 26] Compiling Language.Haskell.Stylish.GHC ( lib/Language/Haskell/Stylish/GHC.hs, dist/build/Language/Haskell/Stylish/GHC.o, dist/build/Language/Haskell/Stylish/GHC.dyn_o )

lib/Language/Haskell/Stylish/GHC.hs:71:32: error:
    • Couldn't match expected type ‘GHC.Settings’
                  with actual type ‘ghc-lib-parser-9.2.3.20220527:GHC.Settings.Settings’
      NB: ‘GHC.Settings’
            is defined in ‘GHC.Settings’ in package ‘ghc-9.2.3’
          ‘ghc-lib-parser-9.2.3.20220527:GHC.Settings.Settings’
            is defined in ‘GHC.Settings’
                in package ‘ghc-lib-parser-9.2.3.20220527’
    • In the first argument of ‘defaultDynFlags’, namely
        ‘GHCEx.fakeSettings’
      In the expression:
        defaultDynFlags GHCEx.fakeSettings GHCEx.fakeLlvmConfig
      In an equation for ‘baseDynFlags’:
          baseDynFlags
            = defaultDynFlags GHCEx.fakeSettings GHCEx.fakeLlvmConfig
   |
71 | baseDynFlags = defaultDynFlags GHCEx.fakeSettings GHCEx.fakeLlvmConfig
   |                                ^^^^^^^^^^^^^^^^^^

lib/Language/Haskell/Stylish/GHC.hs:71:51: error:
    • Couldn't match expected type ‘GHC.LlvmConfig’
                  with actual type ‘ghc-lib-parser-9.2.3.20220527:GHC.Driver.Session.LlvmConfig’
      NB: ‘GHC.LlvmConfig’
            is defined in ‘GHC.Driver.Session’ in package ‘ghc-9.2.3’
          ‘ghc-lib-parser-9.2.3.20220527:GHC.Driver.Session.LlvmConfig’
            is defined in ‘GHC.Driver.Session’
                in package ‘ghc-lib-parser-9.2.3.20220527’
    • In the second argument of ‘defaultDynFlags’, namely
        ‘GHCEx.fakeLlvmConfig’
      In the expression:
        defaultDynFlags GHCEx.fakeSettings GHCEx.fakeLlvmConfig
      In an equation for ‘baseDynFlags’:
          baseDynFlags
            = defaultDynFlags GHCEx.fakeSettings GHCEx.fakeLlvmConfig
   |
71 | baseDynFlags = defaultDynFlags GHCEx.fakeSettings GHCEx.fakeLlvmConfig
   |                                                   ^^^^^^^^^^^^^^^^^^^^
Error: cabal: Failed to build stylish-haskell-0.14.2.0 (which is required by
exe:stylish-haskell from stylish-haskell-0.14.2.0). See the build log above
for details.

[teto]

I think that is blocking the haskell-language-server 923 release, (at least when I tried to package the plugin-enabled version in nix).

[kokobd]

Enabling cabal flag ghc-lib for package stylish-haskell should help. Example:

cabal install --constraint "stylish-haskell +ghc-lib" stylish-haskell

[Mikolaj]

Confirmed. So, I guess, the flag should be conditionally enabled in .cabal? Or marked as not manual, so that cabal can try it out (I haven't tested that variant)?

[Mikolaj]

Actually, the latter won't work, because it's a compilation failure, not a build plan failure.

[sloorush]

Same issue with ghc 9.2.2 as well

Enabling cabal flag ghc-lib for package stylish-haskell should help. Example:

cabal install --constraint "stylish-haskell +ghc-lib" stylish-haskell

This works though

[peterbecich]

This error also occurs when stylish-haskell is used as a haskell.nix shell.tool: https://input-output-hk.github.io/haskell.nix/tutorials/getting-started-flakes.html#scaffolding

example: https://github.com/peterbecich/halogen-chess/blob/cc1f5f6328d4571e1b0331ab58c88b6596015cff/flake.nix#L201-L210

A.f.a.i.k. haskell.nix builds these tools directly from Hackage, I don't know where the solution above cabal install --constraint "stylish-haskell +ghc-lib" stylish-haskell would be applied. I don't know if the Nix configuration here is used for shell.tool: https://github.com/haskell/stylish-haskell/blob/main/default.nix

---

The workaround is to build stylish-haskell separately from the other shell tools with GHC 9.0: https://github.com/peterbecich/halogen-chess/blob/3e0902b1509b50f54ebdf7b3160e1ccad53961ba/flake.nix#L189-L190

[andreasabel]

Same problem with GHC 9.2.5 and stylish-haskell-0.14.3.0.

[peterbecich]

Can this be closed? It appears the GHC 9.2 build and tests succeed: https://github.com/haskell/stylish-haskell/actions/runs/4339790807/jobs/7577708631

[Mikolaj]

Yes, it works great, thank you.