Index: boost/type_traits/is_virtual_base_of.hpp
===================================================================
--- boost/type_traits/is_virtual_base_of.hpp	(revision 64035)
+++ boost/type_traits/is_virtual_base_of.hpp	(working copy)
@@ -52,22 +52,22 @@
        ~Y()throw();
     };
 #else
-    struct X : Derived, virtual Base 
+    struct ____fooX : Derived, virtual Base 
     {
-       X();
-       X(const X&);
-       X& operator=(const X&);
-       ~X()throw();
+       ____fooX();
+       ____fooX(const ____fooX&);
+       ____fooX& operator=(const ____fooX&);
+       ~____fooX()throw();
     };
-    struct Y : Derived 
+    struct ____fooY : Derived 
     {
-       Y();
-       Y(const Y&);
-       Y& operator=(const Y&);
-       ~Y()throw();
+       ____fooY();
+       ____fooY(const ____fooY&);
+       ____fooY& operator=(const ____fooY&);
+       ~____fooY()throw();
     };
 #endif
-    BOOST_STATIC_CONSTANT(bool, value = (sizeof(X)==sizeof(Y)));
+    BOOST_STATIC_CONSTANT(bool, value = (sizeof(____fooX)==sizeof(____fooY)));
 };
 
 template<typename Base, typename Derived>