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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 infrastructure133 Servers

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15 Sep 2025
@alex:tunstall.xyzAlexThanks for the advice. I'll take a look when I get to work on the PRs.14:05:39
@bglgwyng:matrix.orgbglgwyngI realized that I diagnosed the issue wrong15:02:06
@bglgwyng:matrix.orgbglgwyng 
{
        packages.zlib1 = (pkgs.haskellPackages.zlib).override { zlib = pkgs.zlib; };
        # it works
        packages.zlib2 = (pkgs.haskellPackages.callCabal2nix "zlib" inputs.zlib-src { }).override { zlib = pkgs.zlib; };
        # it works
        packages.splitmix1 = (pkgs.haskellPackages.splitmix).override { testu01 = null; };
        # it doesn't work
        packages.splitmix2 = (pkgs.haskellPackages.callCabal2nix "splitmix" inputs.splitmix-src { }).override { testu01 = null; };
      };

Only the last one failed with 'error: function 'anonymous lambda' called without required argument 'testu01''

15:02:33
@bglgwyng:matrix.orgbglgwyngHere is the reproducer https://github.com/bglgwyng/haskellPackages-override15:02:59
@bglgwyng:matrix.orgbglgwyng * 
{
        packages.zlib1 = (pkgs.haskellPackages.zlib).override { zlib = pkgs.zlib; };
        # it works
        packages.zlib2 = (pkgs.haskellPackages.callCabal2nix "zlib" inputs.zlib-src { }).override { zlib = pkgs.zlib; };
        # it works
        packages.splitmix1 = (pkgs.haskellPackages.splitmix).override { testu01 = null; };
        # it doesn't work
        packages.splitmix2 = (pkgs.haskellPackages.callCabal2nix "splitmix" inputs.splitmix-src { }).override { testu01 = null; };
      };

Only the last one failed with error: function 'anonymous lambda' called without required argument 'testu01'

15:03:21
@bglgwyng:matrix.orgbglgwyng I can see testu01 in the arguments of cabal2nix-splitmix, but somehow the override failed. 15:04:08

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