I get this backtrace when I try to C-M-h runs the command c-mark-function inside a c function. This problem seems new in cc-mode 1.18 1.18 C, C++ and Java language support. Signaling: (invalid-function (macro . #<compiled-function (&optional arg) "...(38)" [arg 1 goto-char or scan-sexps (point) 0 (point-max) (point-min) if > (0) ((point-max) (point-min))] 7>)) c-forward-sexp() #<compiled-function nil "...(280)" [start "^}" nil fboundp buffer-syntactic-context-depth c-enable-xemacs-performance-kludge-p pos scan-lists -1 t "^{" distance 0 beginning-of-defun ?\{ defun-prompt-regexp looking-at c-forward-sexp c-parse-state state eod here 1 "[ ]*$" c-backward-syntactic-ws ";" c-beginning-of-statement-1 c-end-of-statement-1 char-before "{" c-forward-syntactic-ws push-mark] 9 ("c:\\XEmacs\\xemacs-packages\\lisp\\cc-mode\\cc-cmds.elc" . 29990) nil>() call-interactively(c-mark-function) Best regards, Adrian -- Adrian Aichner <adrian(a)xemacs.org&gt;