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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 infrastructure138 Servers

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15 Sep 2025
@emilazy:matrix.orgemily(it needs Lennart's branch of Hugs right? presumably we could just send PRs and treat that as the upstream)13:50:11
@alex:tunstall.xyzAlex Right now I'm using gcc13Stdenv, so I may need to take a closer look at the error from newer GCCs... 13:50:16
@alex:tunstall.xyzAlex
In reply to @emilazy:matrix.org
(it needs Lennart's branch of Hugs right? presumably we could just send PRs and treat that as the upstream)
Sounds good to me.
13:50:46
@emilazy:matrix.orgemilyyeah I would prefer a moratorium on adding more GCC 13 at this point :P13:50:47
@emilazy:matrix.orgemilyit's not hard to adapt stuff to newer versions13:50:54
@emilazy:matrix.orgemilyjust slightly tedious sometimes13:50:59
@alex:tunstall.xyzAlex
In reply to @emilazy:matrix.org
it's not hard to adapt stuff to newer versions

This one's non-trivial... Actually something wrong with Hugs' version of base IIRC (maybe a slightly less old base could be patched in?)

ERROR "libraries/bootlib/Foreign/C/Types.hs":173 - Undefined type constructor "NotReallyAType"

13:54:22
@Ericson2314:matrix.orgJohn EricsonOo Haven caught up in all of this, but I like where things are going 13:54:21
@Ericson2314:matrix.orgJohn Ericson*haven't 13:54:25
@emilazy:matrix.orgemilythis is at runtime?13:55:12
@emilazy:matrix.orgemilysmells like latent UB in Hugs that's getting exposed13:55:23
@alex:tunstall.xyzAlexNope, build time.13:55:29

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