Compiler Error C3284

the constraints for generic parameter 'parameter' of function 'function' must match the constraints for generic parameter 'parameter' of function 'function'

A virtual generic function must use the same constraints as a virtual function with the same name and set of arguments in the base class.

The following sample generates C3284:

// C3284.cpp
// compile with: /clr /c
// C3284 expected
public interface class IGettable {
   int Get();
};

public interface class B {
   generic<typename T>
   where T : IGettable
   virtual int mf(T t);
};

public ref class D : public B {
public:
   generic<typename T>
   // Uncomment the following line to resolve.
   // where T : IGettable
   virtual int mf(T t) {
      return 4;
   }
};