This fails due to what seems to be some compiler bug with MPL. That this test does is run following test case : template<typename Number> void test0( Number* = 0 ) { BOOST_CHECK_EQUAL( 2, Number::value ); } with all elements of following list: typedef boost::mpl::list_c<int,2,2,2,2,2,2,2> only_2; I expect 0 errors, borland produce 7, meaning that all of the comparisons fail. Any suggestions, Gennadiy.