haskellPackages: stackage LTS 24.34 -> LTS 24.36

[sternenseemann]

This Merge

This PR is the regular merge of the haskell-updates branch into staging.

This branch is being continually built and tested by hydra at https://hydra.nixos.org/jobset/nixpkgs/haskell-updates. You may be able to find an up-to-date Hydra build report at cdepillabout/nix-haskell-updates-status.

We roughly aim to merge these haskell-updates PRs at least once every two weeks. See the @NixOS/haskell team calendar for who is currently in charge of this branch.

haskellPackages Workflow Summary

Our workflow is currently described in pkgs/development/haskell-modules/HACKING.md.

The short version is this:

• We regularly update the Stackage and Hackage pins on haskell-updates (normally at the beginning of a merge window).
• The community fixes builds of Haskell packages on that branch.
• We aim at at least one merge of haskell-updates into staging every two weeks.
• We only do the merge if the mergeable job is succeeding on hydra.
• If a maintained package is still broken at the time of merge, we will only merge if the maintainer has been pinged 7 days in advance. (If you care about a Haskell package, become a maintainer!)

More information about Haskell packages in nixpkgs can be found in the nixpkgs manual.

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This is the follow-up to #500056. Come to #haskell:nixos.org if you have any questions.

[wolfgangwalther]

According to the team calendar, I am taking over from @maralorn for the next two weeks. Thanks @sternenseemann for creating the PR. We're currently on Stackage 24.34, but there is https://www.stackage.org/lts-24.35, so we should do that first.

@sternenseemann you mentioned in #500056 (comment) we should try to update to Stackage Nightly - is there any indication for when Stackage will do Stackage 25?

[sternenseemann]

@sternenseemann you mentioned in #500056 (comment) we should try to update to Stackage Nightly - is there any indication for when Stackage will do Stackage 25?

I don't know, but I don't think it really matters to us, we can just use nightly for a bit. It doesn't feel like we are gaining much with continuing to bump LTS while we probably do want newer versions of pandoc etc. rather sooner than later (though 9.12 default for 26.05 doesn't seem doable anymore).

[wolfgangwalther]

It doesn't feel like we are gaining much with continuing to bump LTS while we probably do want newer versions of pandoc etc. rather sooner than later (though 9.12 default for 26.05 doesn't seem doable anymore).

Well, if we won't make 26.05 with Nightly, then there's an argument to make to keep bumping LTS until haskell-updates can't make it to 26.05 anymore - since this will be stuff that 26.05 will stick with for half a year. staging branch-off will be on 2026-05-11, so we could possibly get this and one more cycle in.

Just a suggestion, I'm not set on that. I'd be fine with doing Nightly with the next cycle after this PR, too.

[sternenseemann]

(Patches for) problems related to tasty 1.5.4:

• test: prevent binding to the same port in parallel with -threaded lpeterse/haskell-socket#73
• tests/Cleanup: prevent parallel test execute with tasty >= 1.5.4 haskell/criterion#290
• hakyll jaspervdj/hakyll@ae55652
• socket-unix

Probably more issues like this.

[wolfgangwalther]

Hm putting #507578 in the rebuild may be interesting, but I haven't been able to test that change much (and would like to make some small additions as well).

We didn't actually have a full rebuild here, just a few hundred packages. This could be done early in the next iteration instead.

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Current state: Technically we'd be blocked from merging, because microhs is now part of the maintained job, but fails to build on musl. However, I will not block on that given the recent merge of that - I'm not even sure whether that ever built, so far.

Just marked packages failing to build as broken, will merge next. Since today is the last day of my two weeks, I will defer to @sternenseemann, who is next in line, on whether to bump haskell-updates to Stackage Nightly now or not, yet. (even though I argued in #504509 (comment) that we should technically not bump to Nightly, yet, there is also one very good argument for it: The stackage major bump will likely be massive effort again, so starting early with it is certainly not a bad thing, even if we end up only merging it once it becomes Stackage 25 or so...)