error:
       … while calling the 'getAttr' builtin

         at /builtin/derivation.nix:19:19: (source not available)

       … while calling the 'derivationStrict' builtin

         at /builtin/derivation.nix:9:12: (source not available)

       … while evaluating derivation 'ghc-shell-for-foliage-x86_64-unknown-linux-musl'
         whose name attribute is located at /nix/store/apn339kmg5xllk224ghr7cw6468pgkc7-source/pkgs/stdenv/generic/make-derivation.nix:300:7

       … while evaluating attribute 'nativeBuildInputs' of derivation 'ghc-shell-for-foliage-x86_64-unknown-linux-musl'

         at /nix/store/apn339kmg5xllk224ghr7cw6468pgkc7-source/pkgs/stdenv/generic/make-derivation.nix:344:7:

          343|       depsBuildBuild              = lib.elemAt (lib.elemAt dependencies 0) 0;
          344|       nativeBuildInputs           = lib.elemAt (lib.elemAt dependencies 0) 1;
             |       ^
          345|       depsBuildTarget             = lib.elemAt (lib.elemAt dependencies 0) 2;

       … while calling 'getOutput'

         at /nix/store/apn339kmg5xllk224ghr7cw6468pgkc7-source/lib/attrsets.nix:932:23:

          931|   */
          932|   getOutput = output: pkg:
             |                       ^
          933|     if ! pkg ? outputSpecified || ! pkg.outputSpecified

       … while calling anonymous lambda

         at /nix/store/apn339kmg5xllk224ghr7cw6468pgkc7-source/pkgs/stdenv/generic/make-derivation.nix:241:13:

          240|       (map (drv: drv.__spliced.buildBuild or drv) (checkDependencyList "depsBuildBuild" depsBuildBuild))
          241|       (map (drv: drv.__spliced.buildHost or drv) (checkDependencyList "nativeBuildInputs" nativeBuildInputs'))
             |             ^
          242|       (map (drv: drv.__spliced.buildTarget or drv) (checkDependencyList "depsBuildTarget" depsBuildTarget))

       … while calling anonymous lambda

         at /nix/store/apn339kmg5xllk224ghr7cw6468pgkc7-source/lib/lists.nix:117:29:

          116|   */
          117|   imap1 = f: list: genList (n: f (n + 1) (elemAt list n)) (length list);
             |                             ^
          118|

       … from call site

         at /nix/store/apn339kmg5xllk224ghr7cw6468pgkc7-source/lib/lists.nix:117:32:

          116|   */
          117|   imap1 = f: list: genList (n: f (n + 1) (elemAt list n)) (length list);
             |                                ^
          118|

       … while calling anonymous lambda

         at /nix/store/apn339kmg5xllk224ghr7cw6468pgkc7-source/pkgs/stdenv/generic/make-derivation.nix:213:81:

          212|   checkDependencyList = checkDependencyList' [];
          213|   checkDependencyList' = positions: name: deps: lib.flip lib.imap1 deps (index: dep:
             |                                                                                 ^
          214|     if lib.isDerivation dep || dep == null || builtins.isString dep || builtins.isPath dep then dep

       … from call site

         at /nix/store/apn339kmg5xllk224ghr7cw6468pgkc7-source/pkgs/stdenv/generic/make-derivation.nix:214:8:

          213|   checkDependencyList' = positions: name: deps: lib.flip lib.imap1 deps (index: dep:
          214|     if lib.isDerivation dep || dep == null || builtins.isString dep || builtins.isPath dep then dep
             |        ^
          215|     else if lib.isList dep then checkDependencyList' ([index] ++ positions) name dep

       … while calling 'isDerivation'

         at /nix/store/apn339kmg5xllk224ghr7cw6468pgkc7-source/lib/attrsets.nix:640:5:

          639|     # Value to check.
          640|     value: value.type or null == "derivation";
             |     ^
          641|

       … while calling 'tool''

         at /nix/store/c7xfs9gwzzga31gsmwygj18mr01lrlkn-source/overlays/tools.nix:90:50:

           89|   # tool with a default evalPackages to use.
           90|   tool' = evalPackages: compiler-nix-name: name: versionOrMod:
             |                                                  ^
           91|       final.haskell-nix.hackage-tool (

       … from call site

         at /nix/store/c7xfs9gwzzga31gsmwygj18mr01lrlkn-source/overlays/tools.nix:91:7:

           90|   tool' = evalPackages: compiler-nix-name: name: versionOrMod:
           91|       final.haskell-nix.hackage-tool (
             |       ^
           92|            final.haskell-nix.haskellLib.versionOrModToMods versionOrMod

       … while calling 'hackage-tool'

         at /nix/store/c7xfs9gwzzga31gsmwygj18mr01lrlkn-source/overlays/tools.nix:66:18:

           65|
           66|   hackage-tool = projectModules:
             |                  ^
           67|     let

       … from call site

         at /nix/store/c7xfs9gwzzga31gsmwygj18mr01lrlkn-source/overlays/tools.nix:68:17:

           67|     let
           68|       package = final.haskell-nix.hackage-package (projectModules ++ [
             |                 ^
           69|           ({lib, ...}: {

       … while calling 'hackage-package'

         at /nix/store/c7xfs9gwzzga31gsmwygj18mr01lrlkn-source/overlays/haskell.nix:639:27:

          638|         # is required, a specific index-state should be provided!
          639|         hackage-package = projectModule:
             |                           ^
          640|           let project = hackage-project projectModule;

       … from call site

         at /nix/store/c7xfs9gwzzga31gsmwygj18mr01lrlkn-source/overlays/haskell.nix:641:14:

          640|           let project = hackage-project projectModule;
          641|           in project.getPackage project.args.name;
             |              ^
          642|         hackage-project = projectModule:

       … while calling 'getPackage'

         at /nix/store/c7xfs9gwzzga31gsmwygj18mr01lrlkn-source/overlays/haskell.nix:853:26:

          852|             # cabal configure errors are defered until the components derivation builds.
          853|             getPackage = packageName:
             |                          ^
          854|               if rawProject.pkg-set ? configurationError

       … from call site

         at /nix/store/c7xfs9gwzzga31gsmwygj18mr01lrlkn-source/overlays/haskell.nix:658:27:

          657|               callProjectResults = callCabalProjectToNix config;
          658|               plan-pkgs = importAndFilterProject {
             |                           ^
          659|                 inherit (callProjectResults) projectNix sourceRepos src;

       … while calling anonymous lambda

         at /nix/store/c7xfs9gwzzga31gsmwygj18mr01lrlkn-source/lib/import-and-filter-project.nix:5:1:

            4| { pkgs, haskellLib }:
            5| { projectNix, sourceRepos, src }:
             | ^
            6| let

       error: builder for '/nix/store/kgnq7khxibmgfwvjj2426zm0xzdvi87h-cabal-install-plan-to-nix-pkgs.drv' failed with exit code 1;
       last 10 log lines:
       > text)
       > [__4] next goal: semaphore-compat (dependency of cabal-install)
       > [__4] rejecting: semaphore-compat-1.0.0 (conflict:
       > unix==2.7.3/installed-2.7.3, semaphore-compat => unix>=2.8.1.0 && <2.9)
       > [__4] fail (backjumping, conflict set: cabal-install, semaphore-compat, unix)
       > After searching the rest of the dependency tree exhaustively, these were the
       > goals I've had most trouble fulfilling: text, cabal-install, template-haskell,
       > base, unix, semaphore-compat
       > Try running with --minimize-conflict-set to improve the error message.
       > )
       For full logs, run 'nix log /nix/store/kgnq7khxibmgfwvjj2426zm0xzdvi87h-cabal-install-plan-to-nix-pkgs.drv'.