我在C代码中有/**
* Key.
*/
extern key_t key;
变量：
extern.h:29: error: parameters of member key are not (all) documented (warning treated as error, aborting now)
然而，根据Doxygen，这种文档样式是错误的：
extern记录require 'uri'
title = 'A lovely day'
slug = '654790'
uri = URI.parse('http://127.0.0.1:9292/blog/')
[*title.split, slug].join('-') # => "A-lovely-day-654790"
uri.path += [*title.split, slug].join('-')
uri.to_s # => "http://127.0.0.1:9292/blog/A-lovely-day-654790"
变量的正确方法是什么？