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diff --git a/ChangeLog b/ChangeLog
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+Fri Jul 13 10:33:29 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* array.c (rb_ary_flatten_bang): check argument if valid
+	  integer.  [ruby-dev:31197]
+
 Fri Jul 13 10:10:46 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/mkmf.rb (link_command, cc_command, cpp_command): do not expand