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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 infrastructure139 Servers

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30 Mar 2026
@alexfmpe:matrix.orgalexfmpethe vast majority of packages that don't build against newer versions is due to library bounds no? 13:52:26
@alexfmpe:matrix.orgalexfmpeat least in recent GHCs13:52:38
@alexfmpe:matrix.orgalexfmpedeep subsumption was annoying, 9.6 was a bloodbath from mtl re-exports, but lately it's been pretty chill13:53:05
@alexfmpe:matrix.orgalexfmpeit's mostly things coupled with ghc internals that fail purely from a ghc bump anything touching generics, template-haskell, etc 13:55:27
@mangoiv.:matrix.orgMangoIVthat's fair. I will ask if someone who can allocate resources can take co-ownership of this problem. 14:00:07
@teoc:matrix.orgteo (they/he) i should have a bit more free time after ZuriHac hopefully as well 14:02:29
@mangoiv.:matrix.orgMangoIV I'm not confident about the quality of the ram package, yet. 14:08:00
@maralorn:maralorn.demaralornTrue, the enthusiasm for vibe coding by the same author sadly decreases trust in code quality.14:13:08
@maralorn:maralorn.demaralornI mean my thinking would be: That would still help with catching at least all build errors which we would notice immediately on adding the new minor version. Of course it won’t give ghc the full test coverage of nixpkgs and I agree I don’t think it would be fair to do that with nixos-community resources.14:15:03
@janus.troelsen:matrix.orgJanusIt was a mess with the vibe-coded removal and re-addition of stuff, but it's good that an attempt is being made to take over the package. Jappie has good intentions and seems to open to constructive feedback.16:29:09
@janus.troelsen:matrix.orgJanus* It was a mess with the vibe-coded removal and re-addition of stuff, but it's good that an attempt is being made to take over the package. Jappie has good intentions and seems open to constructive feedback.16:29:29
@mangoiv.:matrix.orgMangoIV

Jappie has good intentions and seems open to constructive feedback.

He definitely does, but that doesn't make me less caucious of vibe coding

16:30:38
@andreaspk:matrix.organdreaspk joined the room.18:38:03

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