Excluding MSVC from unsupported feature tests

example/can_invoke_constexpr_function_object.cpp

@@ -4,9 +4,15 @@ Distributed under the Boost Software License, Version 1.0.
 (See accompanying file LICENSE.md or copy at http ://boost.org/LICENSE_1_0.txt)
 ->*/
 
+#include <callable_traits/can_invoke_constexpr.hpp>
+#ifdef CALLABLE_TRAITS_MSVC
+//feature is unsupported in MSVC
+int main(){ return 0; };
+#else
+
 //[ can_invoke_constexpr_function_object
 #include <type_traits>
-#include <callable_traits/callable_traits.hpp>
+#include <callable_traits/can_invoke_constexpr.hpp>
 
 // NOTE: Due to non-compliance in MSVC, can_invoke_constexpr
 // always return std::false_type on that compiler, which causes
@@ -71,3 +77,4 @@ static_assert(!ct::can_invoke_constexpr(s), "");
 
 int main() {}
 //]
+#endif