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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Customising display-fill-column-indicator-mode
Date: Wed, 24 Aug 2022 05:39:30 +0300
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 (message from uzibalqa on Wed, 24 Aug 2022 01:05:54 +0000)
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> Date: Wed, 24 Aug 2022 01:05:54 +0000
> From: uzibalqa <uzibalqa@proton.me>
> Cc: wilnerthomas@tutanota.com, Eli Zaretskii <eliz@gnu.org>, help-gnu-emacs@gnu.org
> 
> Have done the following, and getting
> 
> Lisp error: (error "Non-hex character used for Unicode escape: ) (41)")
> 
> (setq display-fill-column-indicator-character ?\U2502) 
> (setq display-fill-column-indicator-character ?\U+2502)

Use "M-x customize-variable" if you are not proficient enough in Emacs
Lisp.