Index: boost/parameter/preprocessor.hpp
===================================================================
RCS file: /cvsroot/boost/boost/boost/parameter/preprocessor.hpp,v
retrieving revision 1.23
diff -u -r1.23 preprocessor.hpp
--- boost/parameter/preprocessor.hpp	22 Dec 2006 14:38:47 -0000	1.23
+++ boost/parameter/preprocessor.hpp	15 Jun 2007 12:00:13 -0000
@@ -149,7 +149,8 @@
       , typename Parameters::deduced_list
       , tag_keyword_arg
       , mpl::false_
-    >::type type;
+   >::type result;
+   typedef typename mpl::first<result>::type type;
 };
 
 # if 1 //BOOST_WORKAROUND(BOOST_MSVC, < 1300)