e$B$3$s$P$s$Oe(B sheepman e$B$G$9!#e(B
Array#[]= e$B$Ge(B integer overflow e$B$,H/@8$7$^$9!#e(B
$ cat integer_overflow.rb
a = [0, 1, 2, 3]
a[1, 2**31-1] = 10
p a
a = [0, 1, 2, 3]
a[1, 2**31-2] = 10
p a
$ ruby-1.8 -v integer_overflow.rb
ruby 1.8.6 (2007-09-01 patchlevel 5000) [i686-linux]
[]
[0, 10]