This bug report will be sent to the XEmacs Development Team, not to your local site managers!! Please write in English, because the XEmacs maintainers do not have translators to read other languages for them. In XEmacs 21.2 (beta46) "Urania" [Lucid] (i686-pc-linux, Mule) of Sun Apr 15 2001 configured using `configure i686-pc-linux --prefix=/opt --with-mule --with-xim=xlib --without-toolbars --with-dialogs=no --with-menubars=lucid --with-scrollbars=lucid --with-widgets=athena --with-athena=3d --error-checking=none '--cflags=-O3 -mcpu=pentiumpro -march=pentiumpro'' As Norbert reported in the message: http://list-archive.xemacs.org/xemacs-beta/200104/msg00301.html font-lock doesn't work well with ruby-mode because it uses a special form of keyword in `font-lock-syntactic-keywords' (setq font-lock-syntactic-keywords '(("\\$\\([#\"'`$\\]\\)" 1 (1 . nil)) ("\\(#\\)[{$＠]" 1 (1 . nil)) ("\\(/\\)\\([^/\n]\\|\\\\/\\)*\\(/\\)" (1 (7 . ?')) (3 (7 . ?'))))) `font-lock-apply-highlight' function chokes on the last keyword: ("\\(/\\)\\([^/\n]\\|\\\\/\\)*\\(/\\)" (1 (7 . ?')) (3 (7 . ?'))) Please describe exactly what actions triggered the bug and the precise symptoms of the bug: - open a new file, say ~/tmp/sample.rb - load ruby-mode and enable it - start editing ~/tmp/sample.rb: '/test/' As long as the second forward slash is entered XEmacs popups an error message: "(warning/warning) Error caught in `font-lock-pre-idle-hook': (malformed-list ?\')" However, if I disable font-lock and then enable it again, problem goes away for this buffer. and here is the backtrace: Signaling: (malformed-list ?\') eval((7 . ?\')) (setq newface (eval newface)) (or (symbolp newface) (setq newface (eval newface))) (let ((newface ...)) (or (symbolp newface) (setq newface ...)) (cond (... ...) (... nil) (... ...) (... ...) (... ...) (... ...) (... ...))) (let* ((match ...) (start ...) (end ...) (override ...)) (let (...) (or ... ...) (cond ... ... ... ... ... ... ...))) font-lock-apply-highlight((1 (7 . ?\'))) (let ((end ...)) (font-lock-apply-highlight (car highlights)) (and end (goto-char end))) (if (numberp (car ...)) (let (...) (font-lock-apply-highlight ...) (and end ...)) (font-lock-fontify-anchored-keywords (car highlights) end)) (while highlights (if (numberp ...) (let ... ... ...) (font-lock-fontify-anchored-keywords ... end)) (setq highlights (cdr highlights))) (while (and (< ... end) (if ... ... ...)) (setq progress (+ ... ... 5)) (when (and loudly ...) (progress-feedback-with-label ... "Fontifying %s... (regexps)" progress bufname)) (setq old-progress progress) (setq highlights (cdr keyword)) (while highlights (if ... ... ...) (setq highlights ...))) (while keywords (setq keyword (car keywords) matcher (car keyword)) (goto-char start) (while (and ... ...) (setq progress ...) (when ... ...) (setq old-progress progress) (setq highlights ...) (while highlights ... ...)) (setq iter (1+ iter)) (setq keywords (cdr keywords))) (let* ((case-fold-search font-lock-keywords-case-fold-search) (keywords ...) (bufname ...) (progress 5) (old-progress 5) (iter 0) (nkeywords ...) keyword matcher highlights) (while keywords (setq keyword ... matcher ...) (goto-char start) (while ... ... ... ... ... ...) (setq iter ...) (setq keywords ...))) (let ((loudly ...)) (let* (... ... ... ... ... ... ... keyword matcher highlights) (while keywords ... ... ... ... ...)) (if loudly (progress-feedback-with-label ... "Fontifying %s... " 100 ...))) font-lock-fontify-keywords-region(1 7 nil) (progn (if font-lock-syntax-table (set-syntax-table font-lock-syntax-table)) (font-lock-unfontify-region beg end) (when font-lock-syntactic-keywords (font-lock-fontify-syntactic-keywords-region beg end)) (unless font-lock-keywords-only (font-lock-fontify-syntactically-region beg end loudly)) (font-lock-fontify-keywords-region beg end loudly)) (unwind-protect (progn (if font-lock-syntax-table ...) (font-lock-unfontify-region beg end) (when font-lock-syntactic-keywords ...) (unless font-lock-keywords-only ...) (font-lock-fontify-keywords-region beg end loudly)) (set-syntax-table old-syntax-table) (and (not modified) (buffer-modified-p) (set-buffer-modified-p nil))) (let ((modified ...) (buffer-undo-list t) (inhibit-read-only t) (old-syntax-table ...) buffer-file-name buffer-file-truename) (unwind-protect (progn ... ... ... ... ...) (set-syntax-table old-syntax-table) (and ... ... ...))) font-lock-default-fontify-region(1 7 nil) funcall(font-lock-default-fontify-region 1 7 nil) font-lock-fontify-region(1 7) (lambda (beg end val) (font-lock-fontify-region beg end))(1 7 t) map-range-table((lambda (beg end val) (font-lock-fontify-region beg end)) #s(range-table data ((1 7) t))) (let ((zmacs-region-stays zmacs-region-stays)) (map-extents (function ...) nil nil nil nil nil (quote font-lock-pending) t) (put-text-property (point-min) (point-max) (quote font-lock-pending) nil) (map-range-table (function ...) font-lock-range-table)) (save-restriction (widen) (let (...) (map-extents ... nil nil nil nil nil ... t) (put-text-property ... ... ... nil) (map-range-table ... font-lock-range-table))) (save-excursion (save-restriction (widen) (let ... ... ... ...))) (save-current-buffer (set-buffer buffer) (save-excursion (save-restriction ... ...))) (with-current-buffer buffer (save-excursion (save-restriction ... ...))) (progn (clear-range-table font-lock-range-table) (with-current-buffer buffer (save-excursion ...))) (if (buffer-live-p buffer) (progn (clear-range-table font-lock-range-table) (with-current-buffer buffer ...))) (when (buffer-live-p buffer) (clear-range-table font-lock-range-table) (with-current-buffer buffer (save-excursion ...))) (lambda (buffer dummy) (remhash buffer font-lock-pending-buffer-table) (when (buffer-live-p buffer) (clear-range-table font-lock-range-table) (with-current-buffer buffer ...)))(#<buffer "sample.rb"> t) maphash((lambda (buffer dummy) (remhash buffer font-lock-pending-buffer-table) (when (buffer-live-p buffer) (clear-range-table font-lock-range-table) (with-current-buffer buffer ...))) #<hash-table size 0/29 weakness key 0x25da>) (progn (maphash (function ...) font-lock-pending-buffer-table)) (unwind-protect (progn (maphash ... font-lock-pending-buffer-table)) (store-match-data match-data)) (let ((match-data ...)) (unwind-protect (progn ...) (store-match-data match-data))) (save-match-data (maphash (function ...) font-lock-pending-buffer-table)) font-lock-fontify-pending-extents() (if (> (hash-table-count font-lock-pending-buffer-table) 0) (font-lock-fontify-pending-extents)) (condition-case font-lock-error (if (> ... 0) (font-lock-fontify-pending-extents)) (error (warn "Error caught in `font-lock-pre-idle-hook': %s" font-lock-error))) font-lock-pre-idle-hook() Regards, -- Triet H. Lai