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From: "Richard M. Stallman" <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Potential GC-related problems in compose_chars_in_text
Date: Sat, 17 Sep 2005 09:39:06 -0400
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Xref: news.gmane.org gmane.emacs.devel:43038
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    Actually, it often happens that things like ENABLE_CHECKING add assert
    statements in the macro expansion which causes the args to be used more
    than once.

As far as I can see, ENABLE_CHECKING has no such effect anywhere.
And there is only one definition of SREF.