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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/144 Servers

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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
7 Jan 2026
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