{
  inputs.haskellNix.url = "github:input-output-hk/haskell.nix";
  inputs.nixpkgs.follows = "haskellNix/nixpkgs-unstable";
  inputs.flake-utils.url = "github:numtide/flake-utils";
  outputs = { self, nixpkgs, flake-utils, haskellNix }:
    flake-utils.lib.eachSystem [ "x86_64-linux" ] (system:
      let
        overlays = [
          haskellNix.overlay
          (final: _prev: {
            hixProject =
              final.haskell-nix.hix.project {
                src = ./.;
                evalSystem = "x86_64-linux";
              };
          })
        ];
        pkgs = import nixpkgs { inherit system overlays; inherit (haskellNix) config; };
        haskell = pkgs.hixProject.flake { };
      in
      haskell
    );
}