[Bug #3708][Open] Array#permutation $B$,$*$+$7$J7k2L$rJV$9(B

[Kenta_M]

e$B%A%1%C%He(B #3708 e$B$,99?7$5$l$^$7$?!#e(B (by Kenta M.)

e$B%9%F!<%?%9e(B Closede$B$+$ie(BOpene$B$KJQ99e(B

r29037 e$B$G$Oe(B SEGV e$B$,H/@8$9$k$3$H$,$"$C$?$?$a!"0lC6e(B revert
e$B$7$F=$@5$7$J$*$7$^$9!#e(B

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http://redmine.ruby-lang.org/issues/show/3708