I have a currently an unstable health situation, so I don’t know if I can push this further but these are the next steps imo:

1. Persist it somewhere.
2. Add upcoming deprecations to 25.05 release notes (this is obviously moderately urgent).
3. figure out what’s required to actually remove stuff …

I'm trying to build haskellPackages.haxl and getting an error I've never seen before:

$ NIXPKGS_ALLOW_BROKEN=1 nix build --impure github:nixos/nixpkgs/nixpkgs-unstable#haskellPackages.haxl

Running phase: setupCompilerEnvironmentPhase
@nix { "action": "setPhase", "phase": "setupCompilerEnvironmentPhase" }
Build with /nix/store/xmvlqc3f0sfij7083klg3z6i4yr4rvsz-ghc-9.8.4.
Running phase: unpackPhase
@nix { "action": "setPhase", "phase": "unpackPhase" }
unpacking source archive /nix/store/b0gypdzhqq9bbfxm9yxk03h0csbcfsr3-haxl-2.5.1.1.tar.gz
source root is haxl-2.5.1.1
setting SOURCE_DATE_EPOCH to timestamp 1000000000 of file "haxl-2.5.1.1/tests/WriteTests.hs"
Running phase: patchPhase
@nix { "action": "setPhase", "phase": "patchPhase" }
Running phase: compileBuildDriverPhase
@nix { "action": "setPhase", "phase": "compileBuildDriverPhase" }
setupCompileFlags: -package-db=/build/tmp.PtMyMlMYBx/setup-package.conf.d -threaded

<no location info>: error: [GHC-95379]
    Output was redirected with -o, but no output will be generated.
    There is no module named ‘Main’.

This is a recent error, until a few days ago I was able to build it just fine despite the broken status. Can anyone help demystify this error?

It has the usual Setup.hs content:

module Setup where
import Distribution.Simple
main = defaultMain

In reply to @maralorn:maralorn.de
When you say recent error could it be that it was part of the big 9.6 -> 9.8 bump which reached master about two weeks ago?

runhaskell Setup configure
runhaskell Setup build
runhaskell Setup install