LSP fails with VSCode (installed from marketplace)

[xldenis]

Hey!

I just tried installing the extension from the marketplace (I saw the issue for that was recently closed). However whenever I open it up I get this error

[1 of 5] Compiling CabalHelper.Common ( CabalHelper/Common.hs, /Users/xavier/.ghc-mod/cabal-helper/CabalHelper/Common.o )
[2 of 5] Compiling CabalHelper.Licenses ( CabalHelper/Licenses.hs, /Users/xavier/.ghc-mod/cabal-helper/CabalHelper/Licenses.o )

CabalHelper/Licenses.hs:56:8: error:
    • Expecting one more argument to ‘CPackageIndex ModuleName’
      Expected a type, but ‘CPackageIndex ModuleName’ has kind ‘* -> *’
    • In the type signature:
        findTransitiveDependencies :: CPackageIndex ModuleName
                                      -> Set CInstalledPackageId -> Set CInstalledPackageId
   |
56 |     :: CPackageIndex Distribution.ModuleName.ModuleName
   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

/Users/xavier/.stack/snapshots/x86_64-osx/nightly-2017-06-16/8.0.2/libexec/x86_64-osx-ghc-8.0.2/cabal-helper-0.7.3.0/cabal-helper-wrapper "--with-ghc=/Users/xavier/.stack/programs/x86_64-osx/ghc-8.2.1/bin/ghc" "--with-ghc-pkg=/Users/xavier/.stack/programs/x86_64-osx/ghc-8.2.1/bin/ghc-pkg" "--with-cabal=cabal" "/Users/xavier/Code/xldenis/misc" "/Users/xavier/Code/xldenis/misc/.stack-work/dist/x86_64-osx/Cabal-2.0.0.2" "package-db-stack" "entrypoints" "source-dirs" "ghc-options" "ghc-src-options" "ghc-pkg-options" "ghc-merged-pkg-options" "ghc-lang-options" "licenses" "flags" "config-flags" "non-default-config-flags" "compiler-version"

It's not clear why it's building cabal-helper nor why it's failing? I was able to run stack install cabal-helper without any issues so idk what it's doing there?

[DanielG]

See DanielG/ghc-mod#905

[Tehnix]

So you don't have to dig around that much in the issue, which also links another issue, I'll repost how I got it fixed (although please note that I have no idea if this will affect other parts of your system, use at your own risk!):

To sum up how I fixed it (although still remains how it got there), I went to ~/.stack/programs/x86_64-osx/ghc-8.0.2/lib/ghc-8.0.2/package.conf.d where there was a Cabal-2.0.0.2-1HTE9d8rwAi7gJIdEHeKh7.conf present, along with Cabal-1.24.2.0.conf. I deleted Cabal-2.0.0.2-1HTE9d8rwAi7gJIdEHeKh7.conf and now ghc-mod works.

So:

• $ rm ~/.stack/programs/x86_64-osx/ghc-8.0.2/lib/ghc-8.0.2/package.conf.d/Cabal-2.0.0.2*

[Tehnix]

@xldenis were you able to check if the above works for you?

[xldenis]

It doesn't sorry, I don't have that issue. Mainly because I am using cabal 2.0 and ghc 8.2.1. I believe I need to wait for the new version of cabal-helper to be released.

[xldenis]

From what I understand this means that HIE is not compatible with GHC 8.2.1? At the very least, it's not compatible with any stackage release that includes 8.2.1 and therefore Cabal-2.0

[xldenis]

Updating to latest master seems to have fixed this issue! 😄

I have new issues but I'll open up threads for those separately.