MSVC optimizer bug ?

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 21.5 (beta2) "artichoke" [Lucid] (i586-pc-win32) of Tue Aug 07 2001 on NEVERYON configured using `configure UNKNOWN' Please describe exactly what actions triggered the bug and the precise symptoms of the bug: I compiled the latest cvs gnus (OORT 0.04 as of yesterday). Using the optimized nodebug version of xemacs, I get a crash : ================================================================================ Fatal error (22). Your files have been auto-saved. Use `M-x recover-session' to recover them. If you have access to the PROBLEMS file that came with your version of XEmacs, please check to see if your crash is described there, as there may be a workaround available. Otherwise, please report this bug by running the send-pr script included with XEmacs, or selecting `Send Bug Report' from the help menu. As a last resort send ordinary email to `crashes(a)xemacs.org'. *MAKE SURE* to include the information in the command M-x describe-installation. Lisp backtrace follows: # bind (form) gnus-byte-compile((lambda (file orig-file) (nnmail-split-incoming file (quote nnml-save-mail) (quote nil) (if ... nil ...) (quote nnml-active-number)))) # bind (source incomings incoming total new i group-in fetching-sources source s spool-func group temp exit-func method) nnmail-get-new-mail(nnml nnml-save-nov "f:/Mail/" "xemacs-beta") # bind (server group) nnml-request-scan("xemacs-beta" "") # bind (gnus-command-method gnus-inhibit-demon mail-source-plugged gnus-comman d-method group) gnus-request-scan("nnml:xemacs-beta" (nnml "")) # bind (method active method dont-check scan group) gnus-activate-group("nnml:xemacs-beta" scan) # bind (retrieve-groups method active group info scanned-methods foreign-level level newsrc level) gnus-get-unread-articles(2) # bind (gnus-read-active-file init nnmail-fetched-sources dont-connect level r awfile) gnus-setup-news(nil 2 nil) byte-code("..." [gnus-slave gnus-current-startup-file gnus-startup-file did-co nnect level dont-connect gnus-group-quit gnus-run-hooks gnus-startup-hook gnus-m ake-newsrc-file gnus-dribble-read-file bbb-login add-hook gnus-summary-mode-hook gnus-grouplens-mode gnus-setup-news nil gnus-setup-news-hook gnus-start-draft-s etup gnus-group-list-groups gnus-group-first-unread-group gnus-configure-windows group gnus-group-set-mode-line gnus-started-hook gnus-use-dribble-file ... ================================================================================ What is strange is that crash does not happen with the debug version of xemacs. If someone could give me a hint on how to investigate this problem. Thanks, Fabrice