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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Patch: Syntax and Hard Newlines
Date: Thu, 16 Nov 2006 10:01:34 -0500
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    Actually, that is already the case for (at least) `concat':

Stefan argues that modifying strings is not common; nonetheless I
worry that this optimization as currently implemented constitutes a
bug.  Maybe we should make the compiled code copy the string each
time.

Would someone like to implement that?