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+Mon May 30 14:50:25 2016 Nobuyoshi Nakada <nobu@ruby-lang.org>
+
+ * string.c (str_substr, rb_str_aref): refactor not to create
+ unnecessary empty string.
+
+ * string.c (str_byte_substr, str_byte_aref): ditto.
+
Mon May 30 00:09:37 2016 NAKAMURA Usaku <usa@ruby-lang.org>
* ext/-test-/auto_ext.rb: fixed a heedless bug introduced at r55198.