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From: "Alexandre Oberlin" <email_via_web@migo.info>
Newsgroups: gmane.emacs.help
Subject: Re: Why is it not possible to use "nil" any more in init files ?
Date: Wed, 26 Nov 2014 22:12:46 +0100
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On Wed, 26 Nov 2014 15:18:42 +0100, Phillip Lord  
<phillip.lord@newcastle.ac.uk> wrote:

> Bottom line is that nil in lisp is overloaded. In this case,
> it means both "explicit false" and "no argument supplied".
How could (too-bar-mode) and (tool-bar-mode nil) yield different results  
in emacs 23.4 then? Another nasty overloading is when nil is made  
practically equivalent to t in (tool-bar-mode nil).

Alexandre