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From: "Andreas Röhler" <andreas.roehler@easy-emacs.de>
To: help-gnu-emacs@gnu.org
Subject: Re: Get rid of free variable warning from other packages?
Date: Wed, 10 Apr 2013 07:31:29 +0200	[thread overview]
Message-ID: <5164F931.10903@easy-emacs.de> (raw)
In-Reply-To: <26186B0D948E49618DD69E37D686A3CE@us.oracle.com>

Am 10.04.2013 00:13, schrieb Drew Adams:
[ ... ]
> (defvar ido-decorations)
>
> IOW, a vacuous defvar: no value initialization.
>


In Emacs Lisp, the symbol nil has two meanings. First, it means the empty list. Second, it means false and is the value returned when a true-or-false-test tests false.

http://www.gnu.org/software/emacs/emacs-lisp-intro/html_node/nil-explained.html

Or to say: nil means false, but false is more than nothing :)

Cheers,

Andreas



  parent reply	other threads:[~2013-04-10  5:31 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-04-09 19:30 Get rid of free variable warning from other packages? Steven Degutis
2013-04-09 19:35 ` Bob Proulx
2013-04-09 22:13 ` Drew Adams
2013-04-09 22:22   ` Steven Degutis
2013-04-10  5:31   ` Andreas Röhler [this message]
2013-04-10 13:46     ` Drew Adams
2013-04-10  7:38 ` Kevin Rodgers
2013-04-10 13:55   ` Stefan Monnier
2013-04-15  2:37     ` Kevin Rodgers

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