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 = "2.2";
      identifier = { name = "test-haddock"; version = "0.1.0.0"; };
      license = "NONE";
      copyright = "";
      maintainer = "rodney.lorrimar@iohk.io";
      author = "Rodney Lorrimar";
      homepage = "";
      url = "";
      synopsis = "";
      description = "";
      buildType = "Simple";
      };
    components = {
      "library" = {
        depends = [
          (hsPkgs."base" or (buildDepError "base"))
          (hsPkgs."stm" or (buildDepError "stm"))
          ];
        buildable = true;
        };
      };
    } // rec { src = (pkgs.lib).mkDefault ./.; }