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diff --git a/ChangeLog b/ChangeLog
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@@ -1,3 +1,8 @@
+Sat Dec 15 12:58:00 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* encoding.c (rb_enc_register, rb_enc_replicate, rb_enc_alias): check
+	  if already registered.
+
 Sat Dec 15 01:57:06 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* lib/rdoc/options.rb (Options::parse): do not access $KCODE any