-// CS7007: `X' is not a static class. A using namespace directive can only be applied to static classes or namespace
-// Line: 5
-// Compiler options: -langversion:6
+// CS7007: A 'using static' directive can only be applied to types but `System' denotes a namespace. Consider using a `using' directive instead
+// Line: 4
-using X;
-
-class X
-{
-}
\ No newline at end of file
+using static System;