no property 'opCall' for type ... what am I doing wrong?

[Chad J]

main.d:
import std.stdio;

struct A
{
   int member1;
}

struct B
{
   int member2;
}

void main()
{
   A a;
   writefln( (cast(B)a).member2 );
}

That code results in the following compiletime errors:
main.d(16): Error: no property 'opCall' for type 'B'
main.d(16): Error: function expected before (), not 1 of type int
main.d(16): Error: no property 'member2' for type 'int'

I am using DMD 1.014 on Windows.
This seemed to work at some point in history, but not anymore.  What am 
I doing wrong?

Thanks