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+Mon Dec  7 23:45:20 2015  Koichi Sasada  <ko1@atdot.net>
+
+	* string.c: introduce String#+@ and String#-@ to control
+	  String mutability.
+	  [Feature #11782]
+
 Mon Dec  7 23:39:49 2015  Ben Miller  <bjmllr@gmail.com>
 
 	* parse.y: add heredoc <<~ syntax.  [Feature #9098]