Hi! The construct 'eval-when-compile' seems to throw debug off. When pressing C-u C-M-x on the following, an error is issued. This worked correctly in 24.3. This makes it hard to use edebug on functions in cc-mode (like c-font-lock-declarations), as it makes heavy use of eval-when-compile. (defun test (limit) (eval-when-compile (boundp 'parse-sexp-lookup-properties))) Sincerely, Anders Lidgren In GNU Emacs 24.3.50.2 (x86_64-apple-darwin13.0.0, NS apple-appkit-1265.00) of 2013-12-17 on macpro.lan Bzr revision: 115421 monnier@iro.umontreal.ca-20131208081150-4bq2y1cgta14nfmj Windowing system distributor `Apple', version 10.3.1265 Configured using: `configure --with-ns' Important settings: value of $LC_CTYPE: UTF-8 locale-coding-system: utf-8-unix default enable-multibyte-characters: t Major mode: Emacs-Lisp Minor modes in effect: tooltip-mode: t electric-indent-mode: t mouse-wheel-mode: t tool-bar-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t line-number-mode: t transient-mark-mode: t Recent input: C-u C-M-x C-SPC w s-f s-f f f d d d d C-a C-x C-s s-f t e s t C-u C-M-x C-x C-s C-a C-SPC C-g C-SPC w Recent messages: Saving file /Users/anders/emacs/src/misc/bug-edebug-eval-when-compile.el... Wrote /Users/anders/emacs/src/misc/bug-edebug-eval-when-compile.el Beginning of buffer Edebug: test edebug-enter: Symbol's value as variable is void: limit Saving file /Users/anders/emacs/src/misc/bug-edebug-eval-when-compile.el... Wrote /Users/anders/emacs/src/misc/bug-edebug-eval-when-compile.el Mark activated Quit Mark activated Load-path shadows: None found. Features: (shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils misearch multi-isearch edebug easymenu cl-loaddefs cl-lib vc-dispatcher vc-svn time-date tooltip electric uniquify ediff-hook vc-hooks lisp-float-type mwheel ns-win tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment lisp-mode prog-mode register page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer nadvice loaddefs button faces cus-face macroexp files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote make-network-process cocoa ns multi-tty emacs)