Index: boost/mpl/has_xxx.hpp
===================================================================
--- boost/mpl/has_xxx.hpp	(revision 46073)
+++ boost/mpl/has_xxx.hpp	(working copy)
@@ -157,11 +157,13 @@
 // applied to partial specialization to fix some apparently random failures 
 // (thanks to Daniel Wallin for researching this!)
 
-namespace boost { namespace mpl { namespace aux {
-template< typename T > struct msvc71_sfinae_helper { typedef void type; };
-}}}
-
 #   define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, default_) \
+template< typename T > \
+struct BOOST_PP_CAT(trait, _msvc_sfinae_helper) \
+{ \
+    typedef void type; \
+};\
+\
 template< typename T, typename U = void > \
 struct BOOST_PP_CAT(trait,_impl_) \
 { \
@@ -172,7 +174,7 @@
 template< typename T > \
 struct BOOST_PP_CAT(trait,_impl_)< \
       T \
-    , typename boost::mpl::aux::msvc71_sfinae_helper< typename T::name >::type \
+    , typename BOOST_PP_CAT(trait, _msvc_sfinae_helper)< typename T::name >::type \
     > \
 { \
     BOOST_STATIC_CONSTANT(bool, value = true); \