gistfile1.txt

let
  haskell-nix = import (builtins.fetchTarball https://github.com/input-output-hk/haskell.nix/archive/master.tar.gz);
  pkgs-native = import <nixpkgs> haskell-nix;
  pkgs-musl = import <nixpkgs> (haskell-nix // { crossSystem = pkgs-native.lib.systems.examples.musl64; });
  stackProjectCross = {crossPkgs, pkgs, ...}@args: with crossPkgs.haskell-nix;
    let stack = importAndFilterProject (pkgs.haskell-nix.callStackToNix args);
        pkg-set = mkStackPkgSet
      { stack-pkgs = stack.pkgs;
        pkg-def-extras = (args.pkg-def-extras or []);
        modules = (args.modules or [])
                  ++ pkgs.lib.optional (args ? ghc) { ghc.package = args.ghc; }
                  ++ pkgs.lib.optional (args ? cache) (mkCacheModule args.cache);
      };
        p = { inherit (pkg-set.config) hsPkgs; stack-nix = stack.nix; };
    in p.hsPkgs // {
      inherit (p) stack-nix;
      shells.ghc = p.hsPkgs.shellFor {};
    };
args = {
    src = pkgs-native.haskell-nix.haskellLib.cleanGit { src = ./.; };
};
in stackProjectCross (args // { pkgs = pkgs-native; crossPkgs = pkgs-musl; })