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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: grokking cl-callf
Date: Mon, 10 Jul 2017 17:00:15 -0400
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> So In the same spirit, I'm trying to write a function that toggles showing
> line numbers:

I recommend you don't use that code.
For that, better use `define-minor-mode`.


        Stefan