struct inside struct: Is there a way to call a function of the outside struct from the inner struct?

[berni]

> struct A
> {
>     void c() {}
> 
>     struct B
>     {
>         void d()
>         {
>             c();
>         }
>     }
> }

When compiling this with rdmd I get the message: "Error: this for 
c needs to be type A not type B". Is there a way to call c from d?