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+Tue Jul 14 17:29:20 2009  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* string.c (rb_str_index_m): return nil if pos is out of string.
+	  [ruby-core:23660]
+
 Tue Jul 14 16:13:04 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* io.c (rb_io_initialize): check if the descriptor can be accessed