{
  description = "Code samples for `Tagless Final Variables`.";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-21.11";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
      in {
        devShell = pkgs.mkShell {
          buildInputs = [
            pkgs.haskellPackages.cabal-install
            pkgs.haskellPackages.ghc
          ];
        };
      });
}