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+Thu Jun 20 13:14:06 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* error.c (rb_check_backtrace): evaluate RARRAY_AREF only once.
+	  the first argument of RB_TYPE_P is expanded twice for non-immediate
+	  types.
+
 Thu Jun 20 08:09:29 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* tool/gcbench.rb: Summary in one line.