--- old/src/share/vm/gc_implementation/shared/markSweep.hpp	2013-05-10 15:56:01.456884966 +0200
+++ new/src/share/vm/gc_implementation/shared/markSweep.hpp	2013-05-10 15:56:01.396884968 +0200
@@ -88,7 +88,6 @@
   // Used for java/lang/ref handling
   class IsAliveClosure: public BoolObjectClosure {
    public:
-    virtual void do_object(oop p);
     virtual bool do_object_b(oop p);
   };