* lib/rational.rb(Rational#hash): modify algorism for hash-function.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@2708 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rational.rb

@@ -240,7 +240,7 @@ class Rational < Numeric
   end
   
   def hash
-    @numerator ^ @denominator
+    @numerator.hash ^ @denominator.hash
   end
   
   attr :numerator