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diff --git a/ChangeLog b/ChangeLog
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@@ -1,3 +1,8 @@
+Thu Dec 15 14:33:33 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* error.c (rb_check_typeddata): refine error message with
+	  including expected struct name.
+
 Thu Dec 15 13:15:51 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* regcomp.c (onig_region_memsize): implemented for memsize_of().