--- assert.hpp.orig	2008-10-11 08:19:02.221929000 +0200
+++ assert.hpp	2010-01-13 09:22:36.514316900 +0100
@@ -330,38 +330,16 @@
 
 // BOOST_MPL_ASSERT_MSG( (pred<x,...>::value), USER_PROVIDED_MESSAGE, (types<x,...>) ) 
 
-#if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3202))
-#   define BOOST_MPL_ASSERT_MSG_IMPL( counter, c, msg, types_ ) \
+#define BOOST_MPL_ASSERT_MSG_IMPL( counter, c, msg, types_ )  \
 struct msg; \
-typedef struct BOOST_PP_CAT(msg,counter) : boost::mpl::assert_ \
-{ \
-    using boost::mpl::assert_::types; \
-    static boost::mpl::failed ************ (msg::************ assert_arg()) types_ \
-    { return 0; } \
-} BOOST_PP_CAT(mpl_assert_arg,counter); \
 BOOST_MPL_AUX_ASSERT_CONSTANT( \
       std::size_t \
     , BOOST_PP_CAT(mpl_assertion_in_line_,counter) = sizeof( \
-        boost::mpl::assertion<(c)>::failed( BOOST_PP_CAT(mpl_assert_arg,counter)::assert_arg() ) \
+        boost::mpl::assertion_failed<(c)>( (boost::mpl::failed ************ (msg::************) types_) 0 ) \
         ) \
     ) \
 /**/
-#else
-#   define BOOST_MPL_ASSERT_MSG_IMPL( counter, c, msg, types_ )  \
-struct msg; \
-typedef struct BOOST_PP_CAT(msg,counter) : boost::mpl::assert_ \
-{ \
-    static boost::mpl::failed ************ (msg::************ assert_arg()) types_ \
-    { return 0; } \
-} BOOST_PP_CAT(mpl_assert_arg,counter); \
-BOOST_MPL_AUX_ASSERT_CONSTANT( \
-      std::size_t \
-    , BOOST_PP_CAT(mpl_assertion_in_line_,counter) = sizeof( \
-        boost::mpl::assertion_failed<(c)>( BOOST_PP_CAT(mpl_assert_arg,counter)::assert_arg() ) \
-        ) \
-    ) \
-/**/
-#endif
+
 
 #define BOOST_MPL_ASSERT_MSG( c, msg, types_ ) \
 BOOST_MPL_ASSERT_MSG_IMPL( BOOST_MPL_AUX_PP_COUNTER(), c, msg, types_ ) \