Re: [Haskell-cafe] stack install ghcide fails

Smells a bit like it only applies the MonadFail instance in ghc 8.8.1, but the build log said ghc 8.6 and implied MonadFailDesugaring enabled from the error message. On Tue, Dec 10, 2019 at 11:42 AM Vanessa McHale wrote:

cabal install ghcide -w ghc-8.8.1 seems to work, so I don’t think it’s ghcide precisely.

Cheers, Vanessa

On Dec 10, 2019, at 10:37 AM, Viktor Dukhovni wrote:

On Dec 10, 2019, at 11:03 AM, Dušan Kolář wrote:

-- While building package ghcide-0.0.4 using: /home/kolar/.stack/setup-exe-cache/x86_64-linux-tinfo6/Cabal-simple_mPHDZzAJ_2.4.0.1_ghc-8.6.3 --builddir=.stack-work/dist/x86_64-linux-tinfo6/Cabal-2.4.0.1 build --ghc-options " -fdiagnostics-color=always" Process exited with code: ExitFailure 1

Does that mean the ghcide is broken? Or am I doing something wrong?

Taking a quick look at recent ghcide commits, I see:

https://github.com/digital-asset/ghcide/commit/e78e1638ea00af7c5bf4fdbae2454...

which shows changes to a stack.yaml file using "resolver: nightly-2019-12-06". The removed extra-deps are:

- haskell-lsp-0.18.0.0 - lsp-test-0.8.2.0 - hslogger-1.3.0.0 - network-bsd-2.8.1.0

and the presumably expectation is that these will show up in a stack release soon. But in the mean time you've selected:

- haskell-lsp-0.17.0.0 - haskell-lsp-types-0.17.0.0 - hie-bios-0.2.1 - rope-utf16-splay-0.3.1.0

which are older, and may not work with GHC 8.8.1 (MFP changes) used by recent stack nightly builds. You could try changing the stack.yaml file to use an even more recent nightly, but ultimately, may need to figure out the right versions of the extra dependencies.

-- Viktor.

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