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nested backquotes

From: Matthieu Moy
Subject: nested backquotes
Date: Wed, 18 May 2005 17:13:18 +0200
User-agent: Gnus/5.1002 (Gnus v5.10.2) Emacs/21.4 (gnu/linux) 
Hi,

I'm experiencing problems with nested backquotes in Emacs lisp:

Emacs 21 says:

ELISP> ``( ,,(+ 1 2))
(cons
 (+ 1 2))

Whereas XEmacs says:
ELISP> ``( ,,(+ 1 2))
(list 3)

Question 1: Who is right? (I'd say XEmacs here. I don't understand
Emacs's behavior)

Question 2: Is there a portable way to use nested backquotes in Emacs
Lisp?

Thanks,

-- 
Matthieu
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