>> "Mos" == Mos  <Mos> writes:

   >> -            ""))))
   >> +            ""))
   >> +         ((nullp type)
   >> +          "")))
   >                  ^^^^

   > Sorry, I meant nil instead of ""

Hi 

I modified (hopefully correctly) your patch, applied it 
then used my old definitions such as 
(defun LaTeX-rem-insert (environment)	;Version:1.20
	(if (y-or-n-p
		 (format "Do you want a title "))
		(let ((title (read-input " Title: ")))
		  (LaTeX-insert-environment "rem" (concat "[" title "]"))
		  (and (LaTeX-label environment)
			   (newline-and-indent)))
	  (LaTeX-insert-environment "rem")
	  (and (LaTeX-label environment)
		   (newline-and-indent))))

and got an error. I attach the modified patch, and the error

regards

Uwe