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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Refresh display after changing variable
Date: Tue, 03 Aug 2021 18:52:51 +0300
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In-Reply-To: <080b7d73-e4c8-eaf4-fc92-60f28bee288f@us.ibm.com> (message from
 Ken Goldman on Tue, 3 Aug 2021 11:42:45 -0400)
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> From: Ken Goldman <kgoldman@us.ibm.com>
> Date: Tue, 3 Aug 2021 11:42:45 -0400
> 
> >      (set-window-start window (point))))))
> > 
> That line, in the function, yields
> 
> kg-toggle-whitespace-line-column: Symbol’s value as variable is void: window

You did read the doc string of set-window-start and tried to
understand what's the problem, right?