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+Sat Dec 22 01:52:11 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* io.c (io_ungetc): avoid buffer relocation, which might cause
+	  serious problem under concurrent situation.
+
 Sat Dec 22 01:35:41 2007  Tanaka Akira  <akr@fsij.org>
 
 	* re.c (ARG_ENCODING_NONE): defined for /.../n option.