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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: delq string element in ido
Date: Sat, 26 Dec 2009 14:37:47 +0200
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> Date: Sat, 26 Dec 2009 12:13:22 +0000
> From: Leo <sdl.web@googlemail.com>
> Cc: Leo <sdl.web@gmail.com>, emacs-devel@gnu.org
> 
> If buf holds "str1" and ido-cur-list '("str1" "str2" "str3"), (delq
> buf ido-cur-list) does not return '("str2" "str3"). But it does inside
> ido-kill-buffer-at-head. That's where I am confused.

Probably because the value of buf comes from ido-cur-list, so it's the
same Lisp object as one of the strings in ido-cur-list.