enumerating member offsetofs via foreach over members-tuple

[Denis Koroskin]

I'm doing some meta stuff and came across a few problems.

First of is described here:  
http://d.puremagic.com/issues/show_bug.cgi?id=2454

Second one is slightly different and this time I am less sure whether it  
is a bug.
The following code is indetended to print offsets of all its members:

struct Test
{
     short s;
     int i;
     float f;
     double d;

     void test()
     {
         writefln("expected output:");
         writefln( cast(char*)&s - cast(char*)this ); //  
writefln(s.offsetof);
         writefln( cast(char*)&i - cast(char*)this ); //  
writefln(i.offsetof);
         writefln( cast(char*)&f - cast(char*)this ); //  
writefln(f.offsetof);
         writefln( cast(char*)&d - cast(char*)this ); //  
writefln(d.offsetof);

         writefln("actual output:");
         foreach (m; this.tupleof) {
             // writefln(m.offsetof); // Error: no property 'offsetof' for  
type 'short'
             writefln( cast(char*)&m - cast(char*)this);
         }
     }
}

expected output:
0
4
8
16

actual output:
-52
-48
-44
-40

Am I doing something wrong?