[Ruby 1.9-Bug#3774] irb$B$GF|K\8l$,F~NO$G$-$J$$(B

e$B%A%1%C%He(B #3774 e$B$,99?7$5$l$^$7$?!#e(B (by Takeyuki F.)

rvm install ruby-head -C --with-readline-dir=/opt/local
–enable-readline-v6

e$B$@$H$$$1$^$7$?!#e(B

http://redmine.ruby-lang.org/issues/show/3774