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diff --git a/ChangeLog b/ChangeLog
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+Wed Aug  4 19:37:00 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* string.c (rb_str_set_len): rb_str_modify cannot work before the
+	  length is set, which is a precondition for rb_str_modify.
+
 Wed Aug  4 16:09:43 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* string.c (rb_str_resize): should copy the content properly.  a