let
  sources = import ./nix/sources.nix;
  pkgs = import sources.nixpkgs { };
  withPkg = pkgs.lib.callPackageWith pkgs;
  dhall = withPkg sources.easy-dhall-nix { };

in code:
  let
    file = builtins.toFile "dhall-expr" code;

    drv = pkgs.stdenv.mkDerivation {
      name = "dhall-expr-as-nix";

      buildCommand = ''
        dhall-to-nix <<< "${file}" > $out
      '';

      buildInputs = [ dhall.dhall-nix-simple ];
    };
  in
    import "${drv}"