public static extern int mono_test_marshal_return_delegate_delegate (ReturnDelegateDelegate d);
public static extern int mono_test_marshal_return_delegate_delegate(ReturnDelegateDelegate d);
public static extern int mono_test_marshal_return_delegate_delegate (ReturnDelegateDelegate d);
public static extern int mono_test_marshal_return_delegate_delegate(ReturnDelegateDelegate d);