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From: David Kastrup <dak@gnu.org>
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Subject: Re: Comparing against the single-quote symbol '
Date: Tue, 10 Jun 2008 19:07:26 +0200
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Nordlöw <per.nordlow@gmail.com> writes:

> How do I explicitly compare against the single-quote symbol ' in emacs
> lisp programs?
>
> I thought I could use this expression
>   (equal prefix \')
>
> where the value the symbol `prefix' is
>   \'
>
> but \' is not allowed in lisp-code;

Since when?

> it complains about void variable \'

Sure.  The symbol \' has no variable value by default.  If you don't
want to access its variable value but rather its symbol, you need to
quote it.  And sure enough
'\'
works just fine (even though it looks misleadingly symmetric).

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum