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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: New convenience for record_unwind_protect
Date: Sun, 05 Jan 2003 22:26:04 -0500
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I just added a function make_save_value which makes it much cleaner
and easier to pass a C pointer or int value to an unwind handler.

If you come across code that takes a value apart into multiple ints in
order to pass it to an unwind handler, please feel free to change it
to use make_save_value.