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+Thu May  7 16:40:09 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* array.c (rb_ary_flatten_bang): returns nil if nothing changed.
+	  a patch from Marc-Andre Lafortune in [ruby-core:23382].
+
 Thu May  7 14:26:14 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* array.c (rb_ary_sample): negative sample number is invalid.