nobu	2015-09-05 12:58:07 +0900 (Sat, 05 Sep 2015)

  New Revision: 51767

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=51767

  Log:
    rss.rb: don't substitute, just search
    
    * lib/rss/rss.rb (Time#w3cdtf): don't substitute, just search
      zeros at EOS.  [ruby-core:70667] [Bug #11509]

  Modified files:
    trunk/lib/rss/rss.rb
Index: lib/rss/rss.rb
===================================================================
--- lib/rss/rss.rb	(revision 51766)
+++ lib/rss/rss.rb	(revision 51767)
@@ -53,7 +53,7 @@ class Time https://github.com/ruby/ruby/blob/trunk/lib/rss/rss.rb#L53
       if usec.zero?
         fraction_digits = 0
       else
-        fraction_digits = strftime('%6N').sub!(/0*\z/, '').size
+        fraction_digits = strftime('%6N').index(/0*\z/)
       end
       xmlschema(fraction_digits)
     end

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