This library has been deprecated. Modern inf-ruby supports it natively.
Yay!
;; inf-ruby-bond.el -- Support for Bond completion in inf-ruby buffers
;; To install, place inf-ruby-bond.el in your load-path and require
;; the library:
;;
;; (require 'inf-ruby-bond)
;;
;; Your irbrc is responsible for loading and initializing Bond.
;;
;; This will replace inf-ruby's default TAB keybinding with one that
;; uses Bond's completion mechanisms.
;; See also:
;; Bond: http://github.com/cldwalker/bond