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From: "James K. Lowden" <jklowden@speakeasy.net>
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Subject: Re: changing tags-file-name
Date: Thu, 14 Dec 2017 11:39:48 -0500
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On Fri, 08 Dec 2017 12:35:05 +0200
Eli Zaretskii <eliz@gnu.org> wrote:

> > Why would emacs display a variable name, document that setting is
> > fine, and not be able to set it?  
> 
> set-variable only supports user options (a.k.a. "defcustoms").  For
> other variables, use
> 
>   M-: (setq VAR VALUE) RET

Thanks.  Your explanation helped me understand the documentation for
set-variable.  

> > Is there an easier way to change the tags file name (or add one and
> > drop one) that I'm overlooking? 
> 
> You are overlooking "M-x visit-tags-table RET", I think.

Yes, indeed.  "apropos tags" does mention that, but I missed it.  

Many thanks, Eli!    

--jkl