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From: Eric Abrahamsen <eric@ericabrahamsen.net>
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Subject: Re: Persistence of variables
Date: Wed, 21 Mar 2018 17:53:43 +0800
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Marcin Borkowski <mbork@mbork.pl> writes:

> On 2018-03-21, at 07:55, Eli Zaretskii <eliz@gnu.org> wrote:
>
>>> From: Marcin Borkowski <mbork@mbork.pl>
>>> Date: Wed, 21 Mar 2018 07:08:44 +0100
>>> 
>>> I want to make a variable persistent across Emacs sessions.  How do I do
>>> it?
>>
>> Did you consider desktop.el?
>
> No, I did not remember about its existence.
>
> But no, way too heavy.  I want _one variable_ to persist, and nothing
> more.

If you already use savehist-mode, you can add your variable to
savehist-additional-variables.