About `current-directory-list'

[Xue Fuqiao]

In node 14.9.2 of Bob's `An Introduction to Programming in Emacs 
Lisp'(http://www.gnu.org/software/emacs/emacs-lisp-intro/html_node/Files-List.html#Files-List),
 there is a function called `files-in-below-directory' that lists the .el files 
in a directory and its subdirs.

The varlist of the `let' special form is:
(el-files-list
 (current-directory-list
  (directory-files-and-attributes directory t)))

I don't know what does `current-directory-list' means, in my Emacs(24.2), there 
isn't a function named `current-directory-list'.  Can anybody help?
-- 
Best regards.

filelist.el
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