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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Emacs messages
Date: Tue, 04 May 2021 16:59:50 +0300
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 (message from Christopher Dimech on Tue, 4 May 2021 15:08:38 +0200)
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> From: Christopher Dimech <dimech@gmx.com>
> Cc: emacs-devel@gnu.org
> Date: Tue, 4 May 2021 15:08:38 +0200
> 
> > > When using "debug-on-message", what messages would be useful to include?
> >
> > The error message that Emacs displays.
> 
> Thusly, for "debug-on-message", you has to wait for emacs to tell you.  No point in
> presetting any?  Perhaps some frequently encountered messages?

That variable's main use case is when you already know which message
you want to trigger it, or can guess.