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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: GDB does not stop in breakpoint!
Date: Tue, 12 Jan 2010 05:03:16 -0500
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Xref: news.gmane.org gmane.emacs.devel:119864
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/119864>

    Even if arg_vector[0] is not a cons, I can compute car and cdr, and more
    than that - they make sense! Why do they make sense?

XCAR and XCDR just examine the memory inside the object.
If it's not a symbol, they do not care or notice.