case Value(Object value):
case Value(Object value, String type): if (interactive) writer.println(value + ": " + type);
    public void show(EvaluatorResult result, boolean interactive) {        // !!! remove case Value from EvaluatorResult        switch (result) {        case Void:            return;        case Value(Object value):            // !!! if (interactive && value != null) writer.println(value);            return;        case Error(EvaluatorException exception):            writer.println(exception.mkString(global));            return;        }    }