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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: A question about read syntax and compiled backreferences
Date: Mon, 22 Jan 2007 23:38:46 +0200
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> Date: Mon, 22 Jan 2007 17:13:07 +0100
> From: "Juanma Barranquero" <lekktu@gmail.com>
> 
> Why can I evaluate this:
> 
> (defun test ()
>   (let ((z '#1=(a b . #1#)))
>     (safe-length z)))
> 
> but trying to loading it from a byte-compiled file brings
> 
>   Invalid read syntax: "#"
> 
> ?

Maybe because the byte compiler emits constructs that use # ?