akr	2016-04-13 23:55:18 +0900 (Wed, 13 Apr 2016)

  New Revision: 54567

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=54567

  Log:
    Array#sum described.

  Modified files:
    trunk/NEWS
Index: NEWS
===================================================================
--- NEWS	(revision 54566)
+++ NEWS	(revision 54567)
@@ -25,6 +25,8 @@ with all sufficient information, see the https://github.com/ruby/ruby/blob/trunk/NEWS#L25
     Enumerable#max and call max to an Array, your redefinition will be
     now ignored.  You should also redefine Array#max.
 
+  * Array#sum  [Feature #12217]
+
 * Dir
 
   * Dir.empty?.  [Feature #10121]

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