normal	2018-01-18 09:52:01 +0900 (Thu, 18 Jan 2018)

  New Revision: 61894

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=61894

  Log:
    logger: use safe navigation operator
    
    Saves a few hundred bytes of bytecode in a frequently loaded module.

  Modified files:
    trunk/lib/logger.rb
Index: lib/logger.rb
===================================================================
--- lib/logger.rb	(revision 61893)
+++ lib/logger.rb	(revision 61894)
@@ -479,9 +479,7 @@ class Logger https://github.com/ruby/ruby/blob/trunk/lib/logger.rb#L479
   # device exists, return +nil+.
   #
   def <<(msg)
-    unless @logdev.nil?
-      @logdev.write(msg)
-    end
+    @logdev&.write(msg)
   end
 
   #
@@ -568,7 +566,7 @@ class Logger https://github.com/ruby/ruby/blob/trunk/lib/logger.rb#L566
   # Close the logging device.
   #
   def close
-    @logdev.close if @logdev
+    @logdev&.close
   end
 
 private

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