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+Mon Mar 25 01:00:03 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* class.c (rb_prepend_module): check redefinition of built-in optimized
+	  methods.  [ruby-dev:47124] [Bug #7983]
+
+	* vm.c (rb_vm_check_redefinition_by_prepend): ditto.
+
 Mon Mar 25 00:51:57 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* Makefile.in (miniruby, ruby): move MAINLIBC because linker arguments