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+Thu Jan 14 09:34:31 2010  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* string.c (rb_str_concat): raise RangeError when the argument is
+	  negative value. [ruby-core:27583]
+
 Thu Jan 14 08:49:59 2010  Tanaka Akira  <akr@fsij.org>
 
 	* time.c (time_to_r): convert to rational if internal representation