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+Mon Sep 24 17:36:51 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* compile.c (defined_expr), insns.def (defined): share single frozen
+	  strings.  [EXPERIMENTAL] [ruby-core:47558][Feature #7035]
+
+	* iseq.c (rb_iseq_defined_string): make expression strings.
+
 Mon Sep 24 11:22:36 2012  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* tool/merger.rb: add --ticket option to add ticket number.