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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/146 Servers

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12 Mar 2026
@sternenseemann:systemli.orgsterni* alexfmpe: https://hydra.nixos.org/build/32399395820:35:26
@sternenseemann:systemli.orgsterni alexfmpe: probably a regression from 9.12.2 -> 9.12.3, curious 21:47:51
13 Mar 2026
@alexfmpe:matrix.orgalexfmpehmm happens for primitive and text-short02:16:36
@alexfmpe:matrix.orgalexfmpeand 9.14.104:24:40
@alexfmpe:matrix.orgalexfmpe asked in #ghc-js-backend:matrix.org 04:24:44
@sternenseemann:systemli.orgsterniokay I figured out why and wrote there11:18:36
@sternenseemann:systemli.orgsterniwe could just downgrade the job to ghc9122 until this is resolved, not sure11:19:07
@alexfmpe:matrix.orgalexfmpeI didn't even know we had 9.12.3 what with the bug 17:53:50
@alexfmpe:matrix.orgalexfmpeWe don't have ghc912117:54:02
@sternenseemann:systemli.orgsterniwell we patched it so19:58:44
@sternenseemann:systemli.orgsternii thought 9.12.4 was never coming out but rc1 has been uploaded today so19:59:07
@ijouw:matrix.orgijouw I have multiple haskellPackages.developPackage projects i develop infrequently (it's ok if build fails sometimes) using cabal.
I use import <nixpkgs> {} because i do not want to manually set versions for their ghc toolchain, and have them all use the same compiler (they should update using a centrally defined value ; i used ghcup before and it installed 200gb of ghc and libs in a year). I now want to test a newer version of ghc (i want to test the haskell debugger project) but my stable nixpkgs only has ghcHEAD with version >= 9.14 (but which appears to be not yet supported by cabal (or is the cabal in my ghcHEAD an old one?)). Is there a way to have similar behavior?
I was thinking of copying haskell.packages.ghc___ from unstable into my local nixpkgs or pinning unstable in a central haskell project that i need to pull from manually. Any advice is welcome.
23:11:58

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