no size yet for forward reference error

[Erik Smith via Digitalmars-d]

Here's a better reduction of the problem.  Commenting out either 
of the lines marked HERE eliminates the error.   It's some kind 
of interaction with templates, RefCounted, and the cross 
referencing types.

erik


module database;
import std.typecons;

unittest {
     auto con = Connection!int();
}

struct Connection(T) {
     alias Statement = .Statement!T;   // HERE
}

struct Statement(T) {
     alias Connection = .Connection!T;

     private:

     struct Payload {
         Connection con;
         this(Connection con_) {con = con_;}
     }

     alias RefCounted!(Payload, RefCountedAutoInitialize.no) Data;
     Data data_;  // HERE
}