写得很好的Lisp是最容易阅读的语言之一，我喜欢它。但是写得不好的Lisp可能是比糟糕的Java更糟糕的噩梦，等等。

在这里，我们需要创建一个“组文件”，如果一个原始文件有3个变体，后缀为a, b和c。我一直试图追踪一个奇怪的错误，我们得到了不必要的组文件……

  (let ((varianta (format nil "~aa" problem))
        (variantb (format nil "~ab" problem))
        (variantc (format nil "~ac" problem)))
    ;;if the A and B variants exist, create a group file
    ;;(why not just check for a? I don't know, this just feels right)
    (when (and (probe-file varianta)
               (probe-file variantb))
      ...)))

Bug: 1, Gut: 0。

显然，写这篇文章的人没有想到，也许检查所有三种变体是一个好主意。当然，这是我在最初编写这段代码十年之后(它比第一个SVN日志更早)最终追踪到的错误。

//uncomment the following line if the program manager changes her mind again this week

//When I wrote this, only God and I understood what I was doing
//Now, God only knows

long long ago; /* in a galaxy far far away */ 

// set break point here - you'll never reach it

我刚刚注意到自己在写这个

// not brilliant solution, but fair enough heh.