let
  buildDepError = pkg:
    builtins.throw ''
      The Haskell package set does not contain the package: ${pkg} (build dependency).

      If you are using Stackage, make sure that you are using a snapshot that contains the package. Otherwise you may need to update the Hackage snapshot you are using, usually by updating haskell.nix.
      '';
  sysDepError = pkg:
    builtins.throw ''
      The Nixpkgs package set does not contain the package: ${pkg} (system dependency).

      You may need to augment the system package mapping in haskell.nix so that it can be found.
      '';
  pkgConfDepError = pkg:
    builtins.throw ''
      The pkg-conf packages does not contain the package: ${pkg} (pkg-conf dependency).

      You may need to augment the pkg-conf package mapping in haskell.nix so that it can be found.
      '';
  exeDepError = pkg:
    builtins.throw ''
      The local executable components do not include the component: ${pkg} (executable dependency).
      '';
  legacyExeDepError = pkg:
    builtins.throw ''
      The Haskell package set does not contain the package: ${pkg} (executable dependency).

      If you are using Stackage, make sure that you are using a snapshot that contains the package. Otherwise you may need to update the Hackage snapshot you are using, usually by updating haskell.nix.
      '';
  buildToolDepError = pkg:
    builtins.throw ''
      Neither the Haskell package set or the Nixpkgs package set contain the package: ${pkg} (build tool dependency).

      If this is a system dependency:
      You may need to augment the system package mapping in haskell.nix so that it can be found.

      If this is a Haskell dependency:
      If you are using Stackage, make sure that you are using a snapshot that contains the package. Otherwise you may need to update the Hackage snapshot you are using, usually by updating haskell.nix.
      '';
in { system, compiler, flags, pkgs, hsPkgs, pkgconfPkgs, ... }:
  ({
    flags = {};
    package = {
      specVersion = "0";
      identifier = { name = "stack-simple"; version = "0.1.0.0"; };
      license = "BSD-3-Clause";
      copyright = "2019 Author name here";
      maintainer = "example@example.com";
      author = "Author name here";
      homepage = "https://github.com/githubuser/stack-simple#readme";
      url = "";
      synopsis = "";
      description = "Please see the README on GitHub at <https://github.com/githubuser/stack-simple#readme>";
      buildType = "Simple";
      isLocal = true;
      };
    components = {
      "library" = {
        depends = [ (hsPkgs."base" or (buildDepError "base")) ];
        buildable = true;
        };
      exes = {
        "stack-simple-exe" = {
          depends = [
            (hsPkgs."base" or (buildDepError "base"))
            (hsPkgs."stack-simple" or (buildDepError "stack-simple"))
            ];
          buildable = true;
          };
        };
      tests = {
        "stack-simple-test" = {
          depends = [
            (hsPkgs."base" or (buildDepError "base"))
            (hsPkgs."stack-simple" or (buildDepError "stack-simple"))
            ];
          buildable = true;
          };
        };
      };
    } // rec { src = (pkgs.lib).mkDefault ./.; }) // {
    cabal-generator = "hpack";
    }