/dev/null in test/ruby/test_io_m17n.rb

e$B@>;3OB9-$G$9!#e(B

test/ruby/test_io_m17n.rbe$B$Ge(B/dev/nulle$B$re(Bopene$B$7$F$$$^$9$,!"e(B
/dev/nulle$B$,L5$$4D6-$N$3$H$r9M$($k$He(B__FILE__e$B$J$I$re(Bopene$B$9$ke(B
e$B$h$&$K$7$?J}$,NI$$$N$G$O$J$$$G$7$g$&$+e(B?