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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/142 Servers

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23 Oct 2025
@magic_rb:matrix.redalder.orgmagic_rbi need to bump nixpkgs anyway due to a broken aeson i think18:47:32
@alexfmpe:matrix.orgalexfmpemight want to bump to the commit above, at least until the eval error is sorted out19:20:10
@alexfmpe:matrix.orgalexfmpe^19:20:15
@magic_rb:matrix.redalder.orgmagic_rb
In reply to @alexfmpe:matrix.org
might want to bump to the commit above, at least until the eval error is sorted out
compiling for me, still not working, but neither jsaddle nor js is working so i think im doing something very very wrong 		19:29:39
@alexfmpe:matrix.orgalexfmpewhat does 'not working' mean19:30:01
@magic_rb:matrix.redalder.orgmagic_rbclipboard.png
Download clipboard.png		19:30:33
@magic_rb:matrix.redalder.orgmagic_rbsame error on both js and jsaddle19:30:40
@magic_rb:matrix.redalder.orgmagic_rb🤔19:30:45
@magic_rb:matrix.redalder.orgmagic_rbthis is miso so maybe miso is broken, ill try a different commit ig19:31:01
@alexfmpe:matrix.orgalexfmpecan you expand the error on the browser console?19:39:57
@magic_rb:matrix.redalder.orgmagic_rbrolling back miso "fixed it" i may revisit this at some point but rn i actually want to write some code 🥲21:35:30
@magic_rb:matrix.redalder.orgmagic_rbive been trying to get this working for the last 2 months21:35:37
24 Oct 2025
@andreabedini:matrix.organdreabedini changed their display name from andreabedini to Andrea.01:23:08
@andreabedini:matrix.organdreabedini changed their display name from Andrea to andreabedini.04:50:22
25 Oct 2025
@nrbray:matrix.orgNigel joined the room.09:30:09
26 Oct 2025
@ners:nixos.devners

I'm trying to build a project that has build-depends on both haskell-language-server and hls-plugin-api.
Getting the following error when trying to build it with Nix:

Error: [Cabal-7107]
Could not resolve dependencies:
[__0] trying: dosh-24.11 (user goal)
[__1] trying: lsp-client-0.4.0.0/installed-9paX9qIvVp6G32qMeolaRR (dependency of dosh)
[__2] next goal: hls-plugin-api (dependency of dosh)
[__2] rejecting: hls-plugin-api-2.11.0.0/installed-4lbla6iVQTHCJxg4ni6oA8 (conflict: lsp-client => lsp==2.7.0.1/installed-5hx47Y1LdOnAB7d5AgUCZ9, hls-plugin-api => lsp==2.7.0.1/installed-G2N8IrC9NSyIKEvHjZgyEW)
[__2] trying: hls-plugin-api-2.11.0.0/installed-IPU6Rknqm9R6YyD99rrbxT
[__3] next goal: haskell-language-server (dependency of dosh)
[__3] rejecting: haskell-language-server-2.11.0.0/installed-AGaYptnU925K1vcaCIwSpk (conflict: hls-plugin-api==2.11.0.0/installed-IPU6Rknqm9R6YyD99rrbxT, haskell-language-server => hls-plugin-api==2.11.0.0/installed-4lbla6iVQTHCJxg4ni6oA8)
[__3] fail (backjumping, conflict set: dosh, haskell-language-server, hls-plugin-api)

If I pin to nixos-25.05 it works, so it must be a recent breakage.

12:50:29
@maralorn:maralorn.demaralornWell, "breakage".12:55:39

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