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+Wed Nov 21 03:12:50 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* process.c (rb_f_system): returns nil on execution failure.
+	  [ruby-core:13715]
+
 Wed Nov 21 01:04:12 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* object.c (nil_plus): remove unused function.  [ruby-core:13737]