Dude where is my car ?

[Philippe M. Coatmeur <philippe.coatmeur@gmail.com>]

Hi everyone ;

I have this function that loops trough a list of lists of email
elements to extract them. The list looks like this :

(("<test@adamweb.net>" "Fri, 25 May 2012 23:49:58 +0200" "Re: plopz" "1648")
 ("contact <plop@gmail.com>" "Fri, 25 May 2012 22:21:49 +0000" "tst" "1647"))

(This is what you get if you C-h v with point over mail-bug-unseen-mails-one)

(defun mail-bug-desktop-notify-one ()
  (mapcar
   (lambda (x)
     (if (not (member x mail-bug-advertised-mails-one))
	 (progn
	   (mail-bug-desktop-notification
	    "Mew mail!"
	    (format "%s %s %s"           ;; Produces the values below
		    (car (nthcdr 1 x))   ;; Fri, 25 May 2012 23:49:58 +0200
		    (car (nthcdr 2 x))   ;; Re: plopz
		    (car (nthcdr 3 x)))  ;; 1648
	    "500000" mail-bug-new-mail-icon-one)
	   (add-to-list 'mail-bug-advertised-mails-one x))))
   mail-bug-unseen-mails-one))

And this works fine, so it follows that (car (car x)) is the first
element of each atomic list, right ? but when I try to extract it
emacs (24.1.50 cvs) insults me!? I spent more than a good hour trying
to figure this out

(format "%s %s %s"
 (car (car x))        ;; Should produce <test@adamweb.net>
 (car (nthcdr 2 x))   ;; Re: encor un autre
 (car (nthcdr 3 x)))  ;; 1643

error in process sentinel: format: Wrong type argument: listp, "<test@adamweb.net>"
error in process sentinel: Wrong type argument: listp, "<test@adamweb.net>"

(How am I supposed to interpret this first error ? Does format really
expect a list?) What is it that I'm doing wrong ? Where is my car?

Phil