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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 infrastructure135 Servers

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12 Dec 2025
@emilazy:matrix.orgemilyI assume this is macOS.16:39:20
@alexfmpe:matrix.orgalexfmpeoops yeah aarch64-darwin16:40:51
@alexfmpe:matrix.orgalexfmpem1 specifically16:40:58
@alexfmpe:matrix.orgalexfmpehmm so the issue is likely to be from loading unversioned libcrypto?16:53:02
@emilazy:matrix.orgemilymy guess is that it's something related to https://gitlab.haskell.org/ghc/ghc/-/merge_requests/12264 / https://gitlab.haskell.org/ghc/ghc/-/merge_requests/14290 / blah16:54:06
@emilazy:matrix.orgemily it might still be loading libcrypto wrong (we'd want that to be an absolute path for Nix presumably?) 16:54:20
@emilazy:matrix.orgemilybut I'd guess this stuff is what exposed it16:54:28
@alexfmpe:matrix.orgalexfmpeI'm getting this on ghc 9.6 though16:58:02
@emilazy:matrix.orgemily ah. then I have no idea. git bisect --first-parent? :) 16:58:53
@alexfmpe:matrix.orgalexfmpeI mean, 9.8 too, just meant it seems to predate those merge request16:58:56
@emilazy:matrix.orgemilyright17:00:41
@emilazy:matrix.orgemilyI'm just assuming you didn't use to get this17:00:47
@alexfmpe:matrix.orgalexfmpenot sure, first time I try to build this particular project17:01:09
@alexfmpe:matrix.orgalexfmpehmm hang on17:01:15
@alexfmpe:matrix.orgalexfmpe I think changing this to crypto.3 fixed it 17:01:53
@alexfmpe:matrix.orgalexfmpecan't confirm right now because I did a clean afterwards and now github is dying on me or something17:02:11
@emilazy:matrix.orgemily I feel like it should work with just crypto and we're holding it wrong or something. but maybe not. 17:04:00
@emilazy:matrix.orgemilyhave you tried 25.05, 24.11?17:04:08
@alexfmpe:matrix.orgalexfmpeI'll see if I can get away with this stupid workaround just to complete the task I was aiming for, then circle back to investigate this properly17:10:17
@emilazy:matrix.orgemilyfair enough17:11:27
13 Dec 2025
@mjolnir:nixos.orgNixOS Moderation Bot unbanned @mightyiam:matrix.org@mightyiam:matrix.org.05:59:25
@bodzioney:matrix.orgEthan changed their display name from Ethan Bodzioney to Ethan.22:13:39
14 Dec 2025
@mangoiv.:matrix.orgMangoIVwhich combination of things do I have to use currently to not get the segfault? 13:45:44
@maralorn:maralorn.demaralorn MangoIV: You need to avoid hls 9.10 with hlint plugin. So either you switch ghc version or disable hlint either via nix or in your editor config. 14:02:18
@mangoiv.:matrix.orgMangoIVthanks for the help! <3 14:08:57
@maralorn:maralorn.demaralornRelated: https://github.com/NixOS/nixpkgs/pull/47075815:19:22
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16 Dec 2025
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@josh:quadrivium.ukdutchie

Hi, I'm having an issue where haskell.packages.ghc912.unicode-data doesn't build in nixpkgs-unstable or haskell-updates. It looks like it's using the wrong Unicode version at some point:

Test suite test: RUNNING...

Unicode.Char
  Unicode blocks
    Characters not in any block are unassigned [✔]
    Examples [✔]
    Characters are in the definition of their corresponding block [✔]
    Characters in a block definition have the corresponding block [✔]
  Unicode general categories
[WARNING] Cannot test '\2199': incompatible Unicode version (unassigned char). Expected 15.1.0, but got: 16.0.0
[WARNING] Cannot test '\6990': incompatible Unicode version (unassigned char). Expected 15.1.0, but got: 16.0.0
[WARNING] Cannot test '\6991': incompatible Unicode version (unassigned char). Expected 15.1.0, but got: 16.0.0
[WARNING] Cannot test '\7039': incompatible Unicode version (unassigned char). Expected 15.1.0, but got: 16.0.0
[WARNING] Cannot test '\7305': incompatible Unicode version (unassigned char). Expected 15.1.0, but got: 16.0.0
[WARNING] Cannot test '\7306': incompatible Unicode version (unassigned char). Expected 15.1.0, but got: 16.0.0
# snip a bazillion similar warnings
[WARNING] Cannot test '\124409': incompatible Unicode version (unassigned char). Expected 15.1.0, but got: 16.0.0
[WARNING] Cannot test '\124410': incompatible Unicode version (unassigned char). Expected 15.1.0, but got: 16.0.0
      Compare to base [✔]
    isNumber implies a numeric value [✔]

Failures:

  test/Unicode/CharSpec.hs:206:21: 
  1) Unicode.Char.Case toUpper
       predicate failed on: '\411'

  To rerun use: --match "/Unicode.Char/Case/toUpper/" --seed 909632297

  test/Unicode/CharSpec.hs:227:21: 
  2) Unicode.Char.Case toTitle
       predicate failed on: '\411'

  To rerun use: --match "/Unicode.Char/Case/toTitle/" --seed 909632297

Randomized with seed 909632297

Finished in 0.6187 seconds
41 examples, 2 failures
Test suite test: FAIL
Test suite logged to: dist/test/unicode-data-0.6.0-test.log
0 of 1 test suites (0 of 1 test cases) passed.

I can't see any upstream bugs but not really sure what's going on

22:37:31

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