This bug still exists in XEmacs 21.0-b53. -Barry ------- Start of forwarded message ------- Subject: Bug in byte code optimizer Mime-Version: 1.0 (generated by tm-edit 7.106) Content-Type: text/plain; charset=US-ASCII From: mast(a)lysator.liu.se (Martin Stjernholm) Date: 01 Sep 1998 03:39:31 +0200 Message-ID: <7m3eacr4q4.fsf(a)starbug.rydnet.lysator.liu.se&gt; Newsgroups: gnu.emacs.bug There seems to be a bug in the byte code optimizer. The following is a minimal reproducible case under both Emacs 20.2 and XEmacs 20.4. Create a file foo.el with this content (note that char-before is a built-in function): (if whatever (condition-case nil (char-before)) (defsubst char-before () nil)) Start (X)Emacs with -q -no-site-file. Byte compile foo.el with M-x byte-compile-file. I get this in the compilation log: Compiling file /home/mast/elisp/cc-mode/foo.el at Tue Sep 1 03:33:36 1998 ** reference to free variable whatever !! Wrong type argument ((listp #<subr char-before>)) No byte code file is produced. I get no error when I set byte-optimize to nil. /Martin ------- End of forwarded message -------