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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Emacs development...
Date: Sat, 21 Aug 2021 11:10:10 +0300
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To: Jean-Christophe Helary <lists@traduction-libre.org>
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> From: Jean-Christophe Helary <lists@traduction-libre.org>
> Date: Sat, 21 Aug 2021 16:08:54 +0900
> Cc: emacs-devel@gnu.org
> 
> But when I run package.el to test it, I'd like to have a way to examine the values of variables as they evolve. Right now I use message and check the *Messages* buffer... It is not ideal.
> 
> And there are probably a few other things that would make work easier but that I am not aware of because I am not a developer.

The other alternative is Edebug, I think.  You instrument the function
where the variables in which you are interested live, then evaluate
their values while stepping through that function (if Edebug didn't
evaluate them automatically for you).