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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://haskell4nix.readthedocs.io/141 Servers

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9 Mar 2026
@sternenseemann:systemli.orgsterniI finally discovered what breaks HLS on 9.12.3 and its a bug that has been present in Cabal 3.14 all along, but was masked by a bug that has been fixed in Cabal 3.14.2.0 lol https://github.com/haskell/cabal/issues/1159815:03:54
@sternenseemann:systemli.orgsterni
  • https://github.com/fourmolu/fourmolu/pull/518
  • https://github.com/Bodigrim/cabal-add/pull/10
15:22:44
@sternenseemann:systemli.orgsterni IMO a bad change, though, since it doesn't make sense that build-tool-depends are available at test suite run time. Cabal should have rather added a different mechanism (that has been needed since forever) for this. 15:23:50
@b:chreekat.netchreekatYou typoed the name of the executable on the report to cabal-add :P (you wrote fourmolu)16:11:15
@alexfmpe:matrix.orgalexfmpeOh yay more build-tool-depends annoyances18:13:04
@alexfmpe:matrix.orgalexfmpehttps://github.com/well-typed/haskell-debugger/pull/20318:13:07
@alexfmpe:matrix.orgalexfmpeWhich quickly got reverted because cabal somehow failed to build cabal18:15:21
@alexfmpe:matrix.orgalexfmpehttps://github.com/well-typed/haskell-debugger/issues/20618:16:06
@alexfmpe:matrix.orgalexfmpe* Oh yay more build-tool-depends annoyances. I recently ran into 18:16:34
10 Mar 2026
@sternenseemann:systemli.orgsterni chreekat: well it's forever now… 10:00:30
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