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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: How to reliably edit a file from within Emacs Lisp and return a
 string?
Date: Sat, 24 Aug 2019 21:25:20 +0300
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In-reply-to: <20190824173711.GG11684@protected.rcdrun.com> (message from Jean
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> Date: Sat, 24 Aug 2019 19:37:11 +0200
> From: Jean Louis <bugs@gnu.support>
> Cc: GNU Emacs Help <help-gnu-emacs@gnu.org>
> 
> - use simple editing of buffer with kill-buffer-hook, if I can come
>   back to initial program execution, as program execution must be wait
>   for editing to finish, I do not know how

A command such as "M-x loop-continue" (possibly bound globally to some
key sequence) should be enough to resolve the "come back to initial
program execution" part.