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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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26 Sep 2025
@teoc:matrix.orgteo (they/he)A quick glance at the GHC codebase points me to GHC.Types.Errors where it seems like this is always emitted irrespective of whether you are in a fancy terminal. We probably shouldn't do that15:06:29
@teoc:matrix.orgteo (they/he)Ah wait no it is a setting15:06:50
@teoc:matrix.orgteo (they/he) yeah it determines if your terminal supports colours and only uses it in that case. And you can disable it with fprint-error-index-links=never 15:08:23
@maralorn:maralorn.demaralornYeah, but are we sure that nix can’t forward that? I mean it can forward colors.15:14:09
@b:chreekat.netchreekatSounds like something in the chain does not understand the encoding. Maybe something (nix?) is special cased for colors but not that17:04:37
@maralorn:maralorn.demaralornSounds likely.17:12:11

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