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From: A Soare <alinsoar@voila.fr>
Newsgroups: gmane.emacs.devel
Subject: Re: Indentation of constants in LISP
Date: Sun,  4 Feb 2007 14:28:06 +0100 (CET)
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In fact, it is not necessary to add (zerop (skip-syntax-backward "w_")), it is sufficient just to verify that (string (char-syntax ?\:)) is "_", because before the ":" there is or a space or a tab, which is from the " " syntax class, so 
(zerop (skip-syntax-backward "w_")) will always return 0.

Alin Soare