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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: t and nil in pure memory?
Date: Thu, 12 Nov 2009 23:56:54 -0500
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To: Dan Nicolaescu <dann@ics.uci.edu>
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Xref: news.gmane.org gmane.emacs.devel:116924
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    Would it make sense to put Qt and Qnil in pure memory?

That isn't valid.  The property lists of t and nil have to be writable.

We could store the property lists of t and nil in a special way.  Then
they could be pure, as long as we make sure their oblist links never
need to be changed.