{
  description = "A bare minimum Haskell flake";

  inputs = {
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (sys:
      let pkgs = import nixpkgs { system = sys; };
          hpkgs = pkgs.haskellPackages; # pkgs.haskell.ghc<VERSION>
          project = hpkgs.callCabal2nix "my-cool-project" ./. {};
      in {
        packages.default = project;
        devShells.default = pkgs.mkShell {
          inputsFrom = [ project.env ];
        };
      }
    );
}