Cannot find a variable that sets the "abbreviation" of a library name/prefix

[Ruijie Yu via "Emacs development discussions." <emacs-devel@gnu.org>]

Hello,

I'm definitely not dreaming, but I saw a variable from a patch somewhere
the other day, that works like this:

When one sets this variable to an alist of full-name (string) ->
short-name (string), the file itself defines symbols with short names,
while the loader pretends they are using the long names.  For example,
lets say the full name is "library", and short name is "lib".  Then, you
can define functions or variables like this:

```emacs-lisp
;; library.el --- example
(defvar lib-foo nil)
(defun lib-bar () t)

(provide 'library)
;; Local variables:
;; i-dont-know-what-this-variable-is-called: (("library" . "lib"))
;; End:
```

And the outside Elisp environment, when loading this file, now pretends
that the variable `library-foo' and the function `library-bar' are
defined.

```emacs-lisp
(require 'library)
(progn library-foo (library-bar))
```

However, when I search for "abbrev" using M-x apropos-command, I cannot
find anything.  Have I actually been dreaming?  Thanks.

-- 
Best,


RY

[Please note that this mail might go to spam due to some
misconfiguration in my mail server -- still investigating.]