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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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17 Dec 2025
@sternenseemann:systemli.orgsterniah it checks against base so you either need to downgrade GHC so it doesn’t know about those chars as well or upgrade unicode-data, current version is 0.8.0 which supports Unicode 17.0.008:34:57
@sternenseemann:systemli.orgsternior disable the test suite of course08:35:32
@josh:quadrivium.ukdutchieit's still 0.6.0 in all the stackage lts versions, should it be upgraded to 0.8.0 in nixpkgs for GHC 9.12 in nixpkgs despite that?08:39:15
@josh:quadrivium.ukdutchienot sure how rigorously the policy is to stick to the Stackage set08:39:35
@sternenseemann:systemli.orgsterniwe don’t enforce stackage constraints for non default package sets since it isn’t possible really anyways08:41:43
@sternenseemann:systemli.orgsterni it’s questionable whether it should be constrained so rigorously anyways in stackage 08:42:13

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