--- a/hotspot/src/share/vm/memory/space.hpp	Fri Dec 09 19:28:34 2011 -0800
+++ b/hotspot/src/share/vm/memory/space.hpp	Wed Dec 14 12:15:26 2011 +0100
@@ -187,7 +187,7 @@
   // expensive operation. To prevent performance problems
   // on account of its inadvertent use in product jvm's,
   // we restrict its use to assertion checks only.
-  virtual bool is_in(const void* p) const;
+  virtual bool is_in(const void* p) const = 0;
 
   // Returns true iff the given reserved memory of the space contains the
   // given address.