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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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8 Feb 2026
@sternenseemann:systemli.orgsterniwonder when one of those cabal install plan to nix generator projects finally pans out. Should be very possible to make one. I think those would be pretty useful, or alternatively ig revive something like stackage2nix13:07:27
@sternenseemann:systemli.orgsternimaybe people just need to stop trying to make it happen with ifd first…13:07:38
@b:chreekat.netchreekatfor real13:50:38
@toonn:matrix.orgtoonn Can it be done without IFD? Or are you talking about the cabal2nix approach, generating it ahead of time? 13:57:31
@b:chreekat.netchreekatWhat's that new thing that's some sort of recursive nix? Ah, this: https://github.com/NixOS/rfcs/blob/master/rfcs/0092-plan-dynamism.md14:03:01
@toonn:matrix.orgtoonn Without IFD or a functional equivalent, I guess. 14:08:13
@b:chreekat.netchreekatI'm pumped about this, I feel like it could do something special with stackage14:17:42
@b:chreekat.netchreekatSpecifically casa14:17:53
@teoc:matrix.orgteo (they/he)Yeah I used it here for getting cabal files but using nix and casa for packages seems trickier cause the hashing is different(?) https://github.com/cdepillabout/stacklock2nix/commit/3b6eee1ccb533a588be12666ea14e5e05bfe018315:18:54
9 Feb 2026
@b:chreekat.netchreekat

Unfortunately since switching to CAS, stack no longer tells us the
revision of cabal files in lock files.

Fwiw I think this restriction could be lifted in stack. You can have redundant info in the pantry file format, unless I'm mistaken

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11 Feb 2026
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@ashinnv:matrix.orgM̸̙̜̔̇Ǎ̴͎̙͔G̸̞̈N̸͔͍̝͗͋̾Ő̷͖̼͈̽̚L̷̻͚̓̔I̷̛͔̰̟̔Å̴̩̍ ̷̦̒̇͝M̷̱̠̺̉̎A̵̼̎͗͘Ỹ̸̬̲͂̕H̷̙̖͂Ē̷͉̦̌͒M̶͈̥̽̐ changed their display name from mag to magnolia_mayhem.03:48:42
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