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+Sat May 21 21:11:56 2016  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* include/ruby/ruby.h (rb_scan_args): use __VA_ARGS__ instead of
+	  va_arg to allow compilers optimize more aggressive.
+	  https://gustedt.wordpress.com/2011/07/10/avoid-writing-va_arg-functions/
+	  rb_scan_args is now expected to be statically resolved.
+
 Sat May 21 21:07:18 2016  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* configure.in (ALWAYS_INLINE): force compilers the function inlined.