Merge pull request #316658 from symphorien/ibus_engine_option_error_message

let

  cfg = config.i18n.inputMethod.ibus;

  ibusPackage = pkgs.ibus-with-plugins.override { plugins = cfg.engines; };

  ibusEngine = types.package // {

  ibusEngine = lib.types.mkOptionType {

    name  = "ibus-engine";

    inherit (lib.types.package) descriptionClass merge;

    check = x: (lib.types.package.check x) && (attrByPath ["meta" "isIbusEngine"] false x);

  };