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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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30 Dec 2025
@wolfgangwalther:matrix.org@wolfgangwalther:matrix.orghttps://nix.dev/manual/nix/2.19/language/advanced-attributes#adv-attr-structuredAttrs12:55:05
@amadaluzia:tchncs.deamadaluzia[tde] changed their profile picture.12:59:17
@me:linj.techlinjI find this blog very helpful https://nixos.mayflower.consulting/blog/2020/01/20/structured-attrs/13:52:51
@sternenseemann:systemli.orgsterniWe probably (also) have some new Haskell failures on master now with gcc15, so that may be worth checking up on in the coming days.18:32:11
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31 Dec 2025
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1 Jan 2026
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4 Jan 2026
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5 Jan 2026
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6 Jan 2026
@maralorn:maralorn.demaralornSo … What is the 2026 way of running doctests as part of my nix-build?12:36:15
@kephaspierre:matrix.orgPierre Thierry

I'm trying to work on monoidal-functors, but although nix build succeeds, doing cabal build either from nix develop or my shell with direnv and use flake fails with

unknown package: these (dependency of monoidal-functors)

14:44:48
@toonn:matrix.orgtoonn Might Cabal be picking up a different GHC? 14:46:14
@kephaspierre:matrix.orgPierre Thierry It doesn't look like it, cabal --verbose build says Running: /nix/store/a8h81f4wc2nc8qgrfsxvgfd8has0xh3r-ghc-9.6.3/bin/ghc --print-global-package-db and the flake says ghc963 14:48:51
@maralorn:maralorn.demaralornApparently cabal-doctest works. Couldn’t get doctest-discover to run.17:19:16
@maralorn:maralorn.demaralornBut I still very much have no idea what I am doing …17:19:33

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