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+Thu Dec  3 16:02:17 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* string.c (rb_obj_as_string): fstring should not be infected.
+	  TODO: other frozen strings also may not be.
+
 Thu Dec  3 15:39:21 2015  SHIBATA Hiroshi  <hsbt@ruby-lang.org>
 
 	* lib/scanf.rb: fixed double words typo.