whole_func_string: function assert(something, message) {
      if (!something) {
        var error = new Error(message);
        error_output(error.stack);
      }
    }
func_code_string: function assert(something, message) {
      if (!something) {
        var error = new Error(message);
        error_output(error.stack);
      }
    }
func_documentation_string: Utility functions.