[Boost-users] [mpl] Syntax error with BOOST_MPL_ASSERT

What's wrong with this ? template void check_placeholders(const T&) { BOOST_MPL_ASSERT((is_same)); // * } struct Test { typedef int placeholders; }; void f() { check_placeholders<int>(Test()); } msvc9 complains about : error C2059: syntax error : ')' at the line marked with a star. I have put much more complex things inside BOOST_MPL_ASSERT though :-/ I use Boost 1.40. J-L