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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://nixos.org/manual/nixpkgs/unstable/#haskell | Current PR: https://github.com/nixos/nixpkgs/pulls?q=is%3Apr+is%3Aopen+head%3Ahaskell-updates | Maintainer Docs: https://github.com/NixOS/nixpkgs/blob/haskell-updates/pkgs/development/haskell-modules/HACKING.md | More Nix: #community:nixos.org | More Haskell: #haskell-space:matrix.org | Merger Schedule: https://cloud.maralorn.de/apps/calendar/p/H6migHmKX7xHoTFa/dayGridMonth/now | Join #haskell.nix:libera.chat for question about the alternative haskell.nix infrastructure134 Servers

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30 Sep 2025
@maralorn:maralorn.demaralorn* Sadly requirements put upon us by the nixos release process are increasingly in tension with the high velocity rollout bleeding edge users expect.15:54:39
@maralorn:maralorn.demaralornAnd yes of course, I can certainly ping you when the manual HLS build plan resolution needs to happen. Took me about half a day last time.^^15:56:11
@mangoiv.:matrix.orgMangoIV HLS yes, GHC no 15:56:47
@mangoiv.:matrix.orgMangoIV Please do. 15:57:04
@maralorn:maralorn.demaralornWell, I guess the timing is pretty bad this time.15:57:28
@maralorn:maralorn.demaralornWe just made a hackage bump a few days ago.15:57:46
@maralorn:maralorn.demaralornBut I guess we can just do another right now.15:57:53
@maralorn:maralorn.demaralornFixing HLS on all ghc versions besides 9.14 will then be the easier thing.15:58:25
@mangoiv.:matrix.orgMangoIV I want the debugger 15:58:41
@mangoiv.:matrix.orgMangoIV That’s the main thing 15:58:46
@mangoiv.:matrix.orgMangoIV And HLS also has some nice bug fixes in it 15:58:57
@maralorn:maralorn.demaralornYeah, sure.15:59:06
@maralorn:maralorn.demaralornBut I realise my estimate won’t hold.15:59:30
@maralorn:maralorn.demaralornHLS doesn’t even have 9.14 support yet: https://haskell-language-server.readthedocs.io/en/stable/support/ghc-version-support.html15:59:45
@mangoiv.:matrix.orgMangoIV As I said if anything crops up that you need someone to churn through, please ping me. 15:59:48
@mangoiv.:matrix.orgMangoIV I’ll be happy to help 15:59:52
@maralorn:maralorn.demaralornOr are you interested in both of them independently?^^16:00:15
@mangoiv.:matrix.orgMangoIV Jup if ghc 9.14 releases we’ll probably get an estimate from them right 16:00:21
@mangoiv.:matrix.orgMangoIV Independently 16:00:28
@mangoiv.:matrix.orgMangoIV :P 16:00:32
@mangoiv.:matrix.orgMangoIV HLS 2.12 will probably be easier right 16:00:39
@maralorn:maralorn.demaralornOkay16:00:39
@maralorn:maralorn.demaralornYes16:00:49
@maralorn:maralorn.demaralornMost hls updates need next to no intervention actually, now that I think about it. The annoying thing is mainly to keep HLS building while upgrading stackage because that breaks the aforementioned manually fixed build plans.16:02:30
@mangoiv.:matrix.orgMangoIVWhy do you not distribute HLS bindists btw?16:04:42
@mangoiv.:matrix.orgMangoIV Wouldn’t that be much easier 16:04:48
@mangoiv.:matrix.orgMangoIV I am already careful to split the package set for tooling from the one for development anyway 16:06:20
@mangoiv.:matrix.orgMangoIV There’s no reason for me to share them 16:06:27
@mangoiv.:matrix.orgMangoIV Nobody actually uses hls as a library 16:06:37
@mangoiv.:matrix.orgMangoIV I guess it’s a fun exercise to package it but it seems like so much work to do it for 500 compilers-pckset permutations a year 16:07:19

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