* variable.c: Added documentation about order of Module#constants

  [ci skip][Bug #12121][ruby-dev:49505][fix rubyGH-1301]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54231 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Wed Mar 23 10:39:38 2016  Koichi ITO  <koic.ito@gmail.com>
+
+	* variable.c: Added documentation about order of `Module#constants`
+	  [ci skip][Bug #12121][ruby-dev:49505][fix GH-1301]
+
 Tue Mar 22 21:08:30 2016  Martin Duerst  <duerst@it.aoyama.ac.jp>
 
 	* include/ruby/oniguruma.h: Additional flag for characters that are titlecase.

variable.c

@@ -2457,6 +2457,9 @@ rb_const_list(void *data)
  *  modules (example at start of section), unless the <i>inherit</i>
  *  parameter is set to <code>false</code>.
  *
+ *  The implementation makes no guarantees about the order in which the
+ *  constants are yielded.
+ *
  *    IO.constants.include?(:SYNC)        #=> true
  *    IO.constants(false).include?(:SYNC) #=> false
  *