Voldemort type for mixin template.

[ChangLong]

When I try add some sub type for struct with mixin template, 
seems there is no way to hidden the private type.

Is there a way to hidden type from mix template like Voldemort 
type ?

fake code:

mix template TypeX () {
     alias This = typeof(this);

     static struct Unique {
        This* _ptr ;
     }
     static struct Helper {
           private Unique data;
      }
      alias TypeX = {
          alias PublicName = Helper ;
      }
}

struct Node {
     mixin TypeX!();
     PublicName helper;
}