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Haskell in Nixpkgs/NixOS

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For discussions and questions about Haskell with Nix, cabal2nix and haskellPackages in nixpkgs | Current Docs: https://haskell4nix.readthedocs.io/ | More Nix: #community:nixos.org | More Haskell: #haskell-space:matrix.org142 Servers

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2 Dec 2025
@maralorn:maralorn.demaralornAs in: My other duties are completely preventing me from fixing stuff in nixpkgs.08:46:35
@mequbic:matrix.orgiqubic (she/her)I see16:50:48
@mequbic:matrix.orgiqubic (she/her) maralorn: Would you be able to tell me how to modify my shell.nix to disable HLS for now? 16:54:57
@maralorn:maralorn.demaralorndisable HLS or disable hlint?17:00:35
@maralorn:maralorn.demaralorn iqubic (she/her): You need to apply haskell.lib.compose.disableCabalFlag "hlint" to hls. 17:03:08
@maralorn:maralorn.demaralorn e.g. packages = p: [(haskell.lib.compose.disableCabalFlag "hlint" p.haskell-language-server)] or something similar. 17:03:51
@maralorn:maralorn.demaralorn * e.g. buildInputs = [(haskell.lib.compose.disableCabalFlag "hlint" pkgs.haskell-language-server)] or something similar. 17:04:11
@maralorn:maralorn.demaralorn * e.g. buildInputs = [(pkgs.haskell.lib.compose.disableCabalFlag "hlint" pkgs.haskell-language-server)] or something similar. 17:04:22
@mequbic:matrix.orgiqubic (she/her)Actually, I can just tell Emacs to disallow HLint code action stuff. Would that be sufficient for now?17:06:59
@mequbic:matrix.orgiqubic (she/her) maralorn: What do you think? 17:07:10
@maralorn:maralorn.demaralornYou can tell emacs to deactivate the hlint plugin.17:07:50
@maralorn:maralorn.demaralornI don’t know if disabling the code actions does suffice. I think the crash already happens on calculation of available code actions so you have to be early enough.17:08:36
@maralorn:maralorn.demaralorn* I don’t know if disabling the code actions does suffice. I think the crash already happens on calculation of available code actions so you have to be "early enough".17:08:45
@mequbic:matrix.orgiqubic (she/her)

This isn't working for me (pkgs.haskell.lib.compose.disableCabalFlag "hlint" pkgs.haskell-language-server)

LATITUDE-NIXOS hs/aoc25 » nix-shell                                                                         127 ↵
fetching path input 'path:/nix/store/3w2nr2aq2gp76nb6lh1alx6h10mwvp5d-source'
building '/nix/store/mlbpkxipyf763cm4hcanls6wp3mm5vb1-cabal2nix-aoc25.drv'...
error:
       … while evaluating an expression to select 'drvPath' on it
         at «internal»:1:552:
       … while evaluating strict
         at «internal»:1:552:
       (stack trace truncated; use '--show-trace' to show the full trace)

       error: function 'anonymous lambda' called with unexpected argument 'mkDerivation'
       at /nix/store/3w2nr2aq2gp76nb6lh1alx6h10mwvp5d-source/pkgs/development/tools/haskell/haskell-language-server/withWrapper.nix:1:1:
            1| {
             | ^
            2|   lib,

       note: trace involved the following derivations:
       derivation 'aoc-shell'
17:14:55
@mequbic:matrix.orgiqubic (she/her) maralorn: What should I do here? 17:17:03
@maralorn:maralorn.demaralornOoh17:21:28
@maralorn:maralorn.demaralornreplace pkgs.haskell-language-server with pkgs.haskellPackages.haskell-language-server.17:21:57
@mequbic:matrix.orgiqubic (she/her) maralorn: Ta! It works now! 17:25:34
@mequbic:matrix.orgiqubic (she/her)I won't be able to do automated HLint stuff now, but that's fine.18:08:37
@maralorn:maralorn.demaralornYeah, 9.10 is a bit cursed that way.18:14:20
@mequbic:matrix.orgiqubic (she/her)@maralorn: Can I upgrade to a more recent version of GHC that isn't cursed?18:25:12
@mequbic:matrix.orgiqubic (she/her) * maralorn: Can I upgrade to a more recent version of GHC that isn't cursed? 18:25:35
@mequbic:matrix.orgiqubic (she/her)No... I can't. 9.10 is the newest version.18:26:34
@maralorn:maralorn.demaralorn iqubic (she/her): We use ghc 9.12 at work. It’s released and working in nixpkgs. 18:29:22
@mequbic:matrix.orgiqubic (she/her) How can I switch my shell.nix to using 9.12? 18:30:07
@maralorn:maralorn.demaralornReplace all occurences of haskellPackages with haskell.packages.ghc91218:30:46
@mequbic:matrix.orgiqubic (she/her)Does it still have the HLint issue?18:59:51
@mequbic:matrix.orgiqubic (she/her)* Does HLS for 9.12 still have the HLint issue?19:01:16
@maralorn:maralorn.demaralornNo19:16:34
@mequbic:matrix.orgiqubic (she/her)Cool! I have it built it now.19:45:16

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