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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/143 Servers

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19 Feb 2026
@woobilicious:matrix.orgwoobiliciousdo we have a link to the failing test? I assume it's on hydra somewhere05:46:01
@woobilicious:matrix.orgwoobiliciouslol, why is hydra's UI so confusing, do periods break hydra search? wtf05:51:57
@woobilicious:matrix.orgwoobiliciousAhh it hasn't been tested since v10.9 in 202305:59:01
@woobilicious:matrix.orgwoobiliciousOkay fixed: https://github.com/LeventErkok/sbv/pull/77206:56:25
@peddie:matrix.orgpeddiethe hero we don't deserve! nice one!07:09:40
@woobilicious:matrix.orgwoobiliciousyeah was easy find :D07:09:51
@woobilicious:matrix.orgwoobiliciousI also like feeling productive instead of wasting time on the actual code I was gonna write lol07:10:19
@shmwot:matrix.orgcatsarecute joined the room.19:05:45
@alexfmpe:matrix.orgalexfmpehttps://github.com/cdepillabout/nix-haskell-updates-status is nearly a month outdated, is that expected?22:27:45
@niko:nrab.lol-> @n:rab.lol left the room.22:43:10
@maralorn:maralorn.demaralornNope, that is a known problem caused by an eval error.22:51:54
@woobilicious:matrix.orgwoobiliciousThe failing tests on sbv go deeper, than just the fix I made, we should probably just disable tests22:58:36
@woobilicious:matrix.orgwoobiliciousIs there a logic to the configuration-common.nix file order?23:09:56
@woobilicious:matrix.orgwoobilicious I'll add the changes and open a PR against the haskell-updates branch. 23:17:32
@alexfmpe:matrix.orgalexfmperoughly grouping related things lots of conflict-avoidance by not adding stuff at the end I guess23:21:23
@alexfmpe:matrix.orgalexfmpeI do wonder if it shouldn't just be alphabetized and when we apply the same fix to several things, float it to a let at the start23:22:20
@woobilicious:matrix.orgwoobiliciousOh I think I found the "general" section23:23:20
@alexfmpe:matrix.orgalexfmpewe have one?23:23:28
@alexfmpe:matrix.orgalexfmpe I remember the very end being some // { amazonka packages stuff here } and maybe another section like that 23:24:06
@alexfmpe:matrix.orgalexfmpe

in other news, I was trying to understand why pkgsMusl doesn't hit the external interpreter for template haskell

nix-repl> pkgsMusl.stdenv.buildPlatform == pkgsMusl.stdenv.hostPlatform        
true

nix-repl> pkgsMusl.stdenv.buildPlatform.libc                            
"musl"
23:24:18
@alexfmpe:matrix.orgalexfmpedidn't expect it to also change libc on the buildPlatform23:24:58
@woobilicious:matrix.orgwoobiliciousyeah around line 1000 lol, there's a section that's not grouped by anything specifically23:25:10
@woobilicious:matrix.orgwoobilicious huh was it a bad idea to pull from haskell-updates? it's building git from source when running ./maintainers/scripts/haskell/update-hackage.sh 23:31:36
@woobilicious:matrix.orgwoobilicious Or am I supposed to ignore the instructions in HACKING.md? 23:34:12
@alexfmpe:matrix.orgalexfmpehaskell-updates started branching from staging as of last year or so23:41:47
@alexfmpe:matrix.orgalexfmpeso if you pull at a bad time, you can eat nasty rebuilds23:42:12
@alexfmpe:matrix.orgalexfmpee.g. after staging was merged into it but before hydra CI cached that23:42:31
@woobilicious:matrix.orgwoobiliciousI guess I can just checkout master and the cherry-pick the patch? or maybe just let the scripts be called by the next merge?23:43:41
@alexfmpe:matrix.orgalexfmpethat said, haskell-updates is mostly for bumping LTS and dealing with the fallout23:43:46
@woobilicious:matrix.orgwoobilicious I think I'm meant to call ./maintainers/scripts/haskell/regenerate-hackage-packages.sh instead shrug 23:44:02

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