The function report-future-emacs-bug as described in your local emacs distro and online e.g. here:
http://www.opensource.apple.com/darwinsource/Current/emacs-59/emacs/etc/future-bug (BrokenLink) https://github.com/tovbinm/emacs-24-mac/blob/master/etc/future-bug
Or try
locate future-bug
on your local emacs installation.
See also EmacsLisp CategoryEmacs CategoryHumor