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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/ | More Nix: #community:nixos.org | More Haskell: #haskell-space:matrix.org149 Servers

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28 Jul 2025
@maralorn:maralorn.demaralornI just checked out recent nixos-unstable and it seems to work.17:58:30
@maralorn:maralorn.demaralorn* I just checked out recent nixos-unstable and it seems to work for me.17:58:44
29 Jul 2025
@sternenseemann:systemli.orgsterni (he/him) maralorn: do you have time to give https://github.com/NixOS/nixpkgs/pull/429212 a look over or should I just merge it and start an evaluation 11:46:13
@sternenseemann:systemli.orgsterni (he/him) * maralorn: do you have time to give https://github.com/NixOS/nixpkgs/pull/429212 a look over or should I just merge it and start an evaluation? 11:46:16
@sternenseemann:systemli.orgsterni (he/him)or others with relevant experience of course :p11:57:57
@maralorn:maralorn.demaralornI can take a look later.12:29:00
@sternenseemann:systemli.orgsterni (he/him) Pierre Thierry: Feel free to open an issue about it, including enough information to hopefully reproduce the issue you're seeing. 17:12:26
30 Jul 2025
@bkl:matrix.orgdanaI need somethings from the https://github.com/NixOS/nixpkgs/pull/424162, which is now merged into staging. However, when I try to use it locally the caches aren't populated just yet, so I end up recompiling GHC. The caches are a bit confusing since staging or haskell-updates rev that I need don't have the cache, but it's not clear to me when are these changes going to end up in staging-next or master (which do have the caches). Slightly unrelated question: how do things get merged from staging to staging-next in general? Because the https://github.com/NixOS/nixpkgs/blob/master/CONTRIBUTING.md#staging says that there should be a manual PR. However, I don't see anything similar when I search for PRs from staging to staging-next: https://github.com/NixOS/nixpkgs/pulls?q=is%3Apr+base%3Astaging-next+head%3Astaging+12:17:46
@bkl:matrix.orgdana* I need somethings from the https://github.com/NixOS/nixpkgs/pull/424162, which is now merged into staging. However, when I try to use it locally the caches aren't populated just yet, so I end up recompiling GHC. The caches are a bit confusing since staging or haskell-updates rev that I need don't have the cache, but it's not clear to me when are these changes going to end up in staging-next or master (which do have the caches). When do these changes usually propagate to master? Or what ref/rev should I take to get the caches earlier?      Slightly unrelated question: how do things get merged from staging to staging-next in general? Because the https://github.com/NixOS/nixpkgs/blob/master/CONTRIBUTING.md#staging says that there should be a manual PR. However, I don't see anything similar when I search for PRs from staging to staging-next: https://github.com/NixOS/nixpkgs/pulls?q=is%3Apr+base%3Astaging-next+head%3Astaging+12:19:40
@maralorn:maralorn.demaralorn
In reply to @bkl:matrix.org
I need somethings from the https://github.com/NixOS/nixpkgs/pull/424162, which is now merged into staging. However, when I try to use it locally the caches aren't populated just yet, so I end up recompiling GHC. The caches are a bit confusing since staging or haskell-updates rev that I need don't have the cache, but it's not clear to me when are these changes going to end up in staging-next or master (which do have the caches).

Slightly unrelated question: how do things get merged from staging to staging-next in general? Because the https://github.com/NixOS/nixpkgs/blob/master/CONTRIBUTING.md#staging says that there should be a manual PR. However, I don't see anything similar when I search for PRs from staging to staging-next: https://github.com/NixOS/nixpkgs/pulls?q=is%3Apr+base%3Astaging-next+head%3Astaging+
haskell-updates also gets cached, but there was a bag change today so you probably want a commit from a few days ago.
12:22:33

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