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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.org149 Servers

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4 Sep 2025
@qyliss:fairydust.spaceAlyssa RossLLVM? They use GitHub13:54:33
@emilazy:matrix.orgemilywhoops. sorry. GHC.14:05:13
@emilazy:matrix.orgemilyyou see, I am working with LLVM-related GHC patches :P14:05:28
@teoc:matrix.orgTeo (he/him)Do you have the commit?14:08:55
@teoc:matrix.orgTeo (he/him)* Could you share the commit SHA?14:09:10
@teoc:matrix.orgTeo (he/him)If you open the commit, you'll normally see back links at the bottom of the page from marge bot mentions14:10:19
@angerman:matrix.organgerman set a profile picture.21:15:40
@opna2608:matrix.orgPuna joined the room.21:21:56
5 Sep 2025
@Ericson2314:matrix.orgJohn EricsonIf anyone wants to help me debug https://github.com/haskell-nix/hnix-store/pull/289 that would be great. Just wishing aloud in case I'm lucky01:30:55
* @Ericson2314:matrix.orgJohn Ericson sleeps now01:31:03
@dmjio:matrix.org@dmjio:matrix.org left the room.02:09:38
@maralorn:maralorn.demaralornAaah, what is the point of having ghc-lib-parser spanning three ghc versions when fourmolu and ormolu track cabal-syntax anyway which is tightly coupled to the ghc release …12:16:17
@maralorn:maralorn.demaralornI have now the choice of downgrading ghc-lib-parser, fourmolu and ormolu to build hls on ghc 9.10 or to upgrade Cabal/Cabal-syntax. Both either globally or in a quite large overrideScope.12:17:35
@maralorn:maralorn.demaralornI feel like I am overlooking something because that didn’t feel as painful before …12:18:04
@artem.types:matrix.orgArtem maralorn: the very strict bounds that Ormolu puts on Cabal-syntax look strange. I'd ask on their bug tracker exactly the question you're posing above: if you use ghc-lib-parser, you probably want to span over at least couple of GHC, but you also always limit Cabal-syntax to one version, so this looks like mixed messages... They always bump Cabal-syntax when they bump ghc-lib-parser, so they at least understand some connection they just overly pessimistic about it it looks like. 15:10:21
@maralorn:maralorn.demaralornI guess using ghc-lib-parser might have other advantages than just the compatibility range …15:14:22
@artem.types:matrix.orgArtemmaybe, but there seems to be no reason to be as strict about Cabal-syntax bounds: they use just a few basic things from it, and those don't really change15:20:45

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