// This interface defines method signatures<br>
interface IWhatever { ... }

最初的《毁灭战士》拥有一个带有静态墙壁的引擎，但却不能移动;结果，所有的门都是垂直打开的;任何东西都不可能水平移动。当源代码发布后，我在查看代码时，在处理门的源文件中看到了这个，在一大块注释掉的代码的开头:

// UNUSED
// Separate into p_slidoor.c?

#if 0           // ABANDONED TO THE MISTS OF TIME!!!
//
// EV_SlidingDoor : slide a door horizontally
// (animate midtexture, then set noblocking line)
//

# To understand recursion, see the bottom of this file 

在文件的底部:

# To understand recursion, see the top of this file

// This code sucks.

/* You are not meant to understand this */ 

long john; // silver