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. 

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See also EmacsLisp 
CategoryEmacs CategoryHumor