-// CS1061: Type `U2' does not contain a definition for `Test' and no extension method `Test' of type `U2' could be found (are you missing a using directive or an assembly reference?)
+// CS1061: Type `U2' does not contain a definition for `Test' and no extension method `Test' of type `U2' could be found. Are you missing an assembly reference?
// Line: 20
interface I<T>