Suppress MSVC level 4 warnings

test/construct_from_tuple.cpp

@@ -7,6 +7,10 @@
 // http://www.boost.org/LICENSE_1_0.txt
 
 
+#if defined(_MSC_VER)
+#pragma warning( disable: 4244 ) // 'initializing': conversion from 'int' to 'char', possible loss of data
+#endif
+
 #include <boost/mp11/tuple.hpp>
 #include <boost/core/lightweight_test.hpp>
 #include <boost/config.hpp>