Issue #709 has been updated by Brian Candler. For clarity, here's what that example outputs: $ ruby19 -v ruby 1.9.1 (2008-10-28 revision 19983) [i686-linux] $ ruby19 enum_plus.rb 1 2 3 10 11 12 17 18 19 20 $ ---------------------------------------- http://redmine.ruby-lang.org/issues/show/709 ---------------------------------------- http://redmine.ruby-lang.org