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From: Michael Heerdegen <michael_heerdegen@web.de>
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Subject: Re: visible-whitespace-mode
Date: Thu, 09 Jun 2022 20:17:06 +0200
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goncholden <goncholden@protonmail.com> writes:

> Because I used
>
> (require 'visible-whitespace-mode)
>
> and that failed as well.

Your file doesn't provide a feature, so you can't use `require' to load
it (you would not `require' the mode name anyway - please have a look in
the manual how `provide' and `require' work).

So you can either add a `provide' statement to your file, or load it
using `load': (load "visws").

Michael.