First, copy the Lisp form to your *scratch* buffer and type `C-j' with
point right after the last parenthesis. If the form returns nil, type
`M-x report-xemacs-bug RET', type in a subject for the bug report and
type <RET>. Then add some text explaining your situation (what you
did, what happened, and what you expected to happen) together with the
backtrace you got. In addition add the above Lisp form as a
self-contained test case. When you are done editing, send the report
away by typing `C-c C-c' assuming your XEmacs is set up correctly for
sending mail. If it is not, you can also copy and paste the report to
your preferred mail program, insert the respective mail address and
subject and send it with that program.