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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: master c7ebe5a: Highlight non-existent commands in M-x shell
Date: Fri, 09 Sep 2022 22:13:29 +0300
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To: Miha Rihtarsic <miha@kamnitnik.top>, Lars Ingebrigtsen <larsi@gnus.org>
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Xref: news.gmane.io gmane.emacs.devel:295091
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/295091>

I cannot parse this doc string:

  +(defun shell-highlight-undef-reset-mode ()
  +  "If `shell-highlight-undef-mode' is on, turn it off and on."

Can it be clarified or fixed?  What does it mean to "turn it on and
off if it is on"?