# File cli/ruby-debug/command.rb, line 138
      def register_setting_var(name, default)
        var_name = "@@#{name}"
        class_variable_set(var_name, default)
        register_setting_get(name) { class_variable_get(var_name) }
        register_setting_set(name) { |value| class_variable_set(var_name, value) }
      end