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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Emacs messages
Date: Tue, 04 May 2021 14:49:59 +0300
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To: Christopher Dimech <dimech@gmx.com>
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 (message from Christopher Dimech on Tue, 4 May 2021 07:48:12 +0200)
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> From: Christopher Dimech <dimech@gmx.com>
> Date: Tue, 4 May 2021 07:48:12 +0200
> Sensitivity: Normal
> 
> I have an extensive number of .el files I use to customise emacs.
> A few moments ago I made changes to the code and kept one variable
> unmodified as `sel' rather than using `selection'.
> 
> Emacs complained with
> 
>   cond: Symbol’s value as variable is void: sel
> 
> It would be instructive for users if emacs include additional information,
> like the file name and line number associated with the detected `cond' problem.

Emacs does that if you set debug-on-error non-nil, the you will have
the backtrace from which you can jump to the offending source.