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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 infrastructure137 Servers

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5 Aug 2025
@fargate-official:matrix.org@fargate-official:matrix.org left the room.12:45:33
@mrcjk:matrix.orgMarc JakobiIt's a combination of library profiling + template haskell in large modules (500 LOC). Please don't ask me why we have modules with ~500 LOC 🙈13:39:15
@magic_rb:matrix.redalder.orgmagic_rb500 loc is not that much? Id think13:39:53
@magic_rb:matrix.redalder.orgmagic_rbIf you said 5000loc then sure13:40:00
@mrcjk:matrix.orgMarc JakobiI don't know how much the TH is adding to those lines13:44:38
@magic_rb:matrix.redalder.orgmagic_rbAh right, lots of TH13:44:56
@teoc:matrix.orgteo (they/he)You can use https://downloads.haskell.org/ghc/latest/docs/users_guide/debugging.html#ghc-flag-ddump-splices if you want to see the stuff TH outputs14:07:00
@sternenseemann:systemli.orgsterniyou should also probably try to figure out whether GHC or the linker is the problem14:44:05
6 Aug 2025
@mikelpr:matrix.orgMikel Pérez changed their profile picture.02:53:36
7 Aug 2025
@jryans:matrix.orgJ. Ryan Stinnett joined the room.13:34:41
8 Aug 2025
@0x4a6f:nixos.dev0x4A6F joined the room.06:54:24
@sternenseemann:systemli.orgsterni teo (they/he): is there an issue alreday for the issue that finalStage = Stage2 is silently ignored? 10:06:06

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