{
  # Adds a local Haskell package to the package set, then uses `shellFor`
  # so the dev shell follows that package's build inputs.
  description = "A Haskell dev shell built with shellFor";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
  };

  outputs =
    { self, nixpkgs, ... }:
    let
      system = "x86_64-linux";
      pkgs = import nixpkgs { inherit system; };
      haskellPackages = pkgs.haskellPackages.override {
        overrides = final: _: {
          mini-shellfor = final.callCabal2nix "mini-shellfor" ./. { };
        };
      };
      project = haskellPackages.mini-shellfor;
      checkedProject = pkgs.haskell.lib.doCheck project;
    in
    {
      packages.${system}.default = project;

      apps.${system}.default = {
        type = "app";
        program = "${self.packages.${system}.default}/bin/mini-shellfor";
        meta.description = "Run the shellFor-based Haskell example.";
      };

      devShells.${system}.default = haskellPackages.shellFor {
        packages = hp: [ hp.mini-shellfor ];

        nativeBuildInputs = [
          pkgs.cabal-install
          pkgs.haskell-language-server
        ];
      };

      checks.${system}.test-suite = checkedProject;
    };
}