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

After an update, I've come up against another failure.

❯ nix build
warning: Git tree '/home/main/code/community/lamdu' is dirty
error:
       … while calling the 'derivationStrict' builtin
         at <nix/derivation-internal.nix>:37:12:
           36|
           37|   strict = derivationStrict drvAttrs;
             |            ^
           38|

       … while evaluating derivation 'Lamdu-0.8.1'
         whose name attribute is located at /nix/store/g3z13ffr1wzw8m9wivqyni2nbjl956wj-source/pkgs/stdenv/generic/make-derivation.nix:480:13

       … while evaluating attribute 'buildInputs' of derivation 'Lamdu-0.8.1'
         at /nix/store/g3z13ffr1wzw8m9wivqyni2nbjl956wj-source/pkgs/stdenv/generic/make-derivation.nix:535:13:
          534|             depsHostHost = elemAt (elemAt dependencies 1) 0;
          535|             buildInputs = elemAt (elemAt dependencies 1) 1;
             |             ^
          536|             depsTargetTarget = elemAt (elemAt dependencies 2) 0;

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: function 'anonymous lambda' called with unexpected argument 'libxml'
       at /nix/store/zjbqzwnsp7092jagr1xgrd33dq1i35xp-cabal2nix-test-framework-0.8.2.2/default.nix:1:1:
            1| { mkDerivation, ansi-terminal, ansi-wl-pprint, base, bytestring
             | ^
            2| , containers, hostname, HUnit, lib, old-locale, QuickCheck, random