ko1	2015-12-08 01:30:31 +0900 (Tue, 08 Dec 2015)

  New Revision: 52919

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=52919

  Log:
    add a NEWS entry for r52917

  Modified files:
    trunk/NEWS
Index: NEWS
===================================================================
--- NEWS	(revision 52918)
+++ NEWS	(revision 52919)
@@ -106,6 +106,11 @@ with all sufficient information, see the https://github.com/ruby/ruby/blob/trunk/NEWS#L106
 
 * Regexp/String: Updated Unicode version from 7.0.0 to 8.0.0
 
+* String
+
+  * String#+@ and String#- are added to get mutable/frozen strings.
+    [Feature #11782]
+
 * Struct
   * Struct#dig [Feature #11688]
 

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