Anyway to achieve the following

[JG via Digitalmars-d-learn]

Suppose one has a pointer p of type T*.
Can on declare variable a of type T which is stored in the 
location pointed to by p?

As an example if we have:

    struct S
    {
      int x = 1234;
    }

    void main() {
       S s;
       //unknown construction of a using &(s.x)
       writeln(a); //displays 1234
       s.x = s.x+1;
       writeln(a); //displays 1235
       a = a +1;
       writeln(s.x); //displays 1236
    }
----------------------------------------------------------------
Similar behavior can be achieved in the body of the lambda here

    import std.stdio;

    struct S
    {
      int x = 1234;
    }


    void main() {
        S s;
        (ref a){
             writeln(a);
             s.x = s.x + 1;
             writeln(a);
             a = a +1;
             writeln(s.x);
        }(s.x);
    }