nested backquotes

[Carlos Ungil]

Hello,

I've found (what I think it is) a bug when using nested backquotes.

What follows has been executed using "emacs --no-init".
I understand that the first test is giving the right result, and that 
in the other cases there is a problem with the backquotes.

Maybe the reason it works in windows is because I'm 
using a more recent version (21.3.50, compared to 21.2.1 in linux 
and solaris), and the bug has indeed been fixed already, but I've 
found no references to this bug in emacs newsgroups, or in the 
PROBLEMS file (and the file backquote.el has not been changed, but 
maybe the origin of the bug was somewhere else).

Regards,

Carlos Ungil

-----

(emacs-version)
=>"GNU Emacs 21.3.50.1 (i386-mingw-nt5.1.2600) of 2003-08-21 on MIDASPSE17"

(defmacro test ()
  ``(a ,b ,,c))
=>test

(let ((a 1) (b 2) (c 3))
  (macroexpand (macroexpand '(test))))
=>(list (quote a) b 3)

-----

(emacs-version)
=>"GNU Emacs 21.2.1 (sparc-sun-solaris2.9, X toolkit, Xaw3d scroll bars) of 
2003-05-19 on watford-71"

(defmacro test ()
  ``(a ,b ,,c))
=>test

(let ((a 1) (b 2) (c 3))
  (macroexpand (macroexpand '(test))))
=>(list (quote a) b \,c)

-----

(emacs-version)
=>"GNU Emacs 21.2.1 (i386-redhat-linux-gnu, X toolkit, Xaw3d scroll bars) of 
2002-04-09 on porky.devel.redhat.com"

(defmacro test ()
  ``(a ,b ,,c))
=>test

(let ((a 1) (b 2) (c 3))
  (macroexpand (macroexpand '(test))))
=>(list (quote a) b \,c)