How can I convert a generic Type?

[rnd83]

It's just an example. Think of Point as pixel position on a screen. So float to 
int is acceptable. But thanks for the example. What I was after was something 
like this: 
    
    
    proc point[T, U](dest: var Point[T]; pt: Point[U]) =
      dest.x = T(pt.x)
      dest.y = T(pt.y)
    
    
    Run

I tried it with Point[U] as return value, but got an error: "can't instanciate 
U"

So now I can use it like this: 
    
    
    var b = point(2.1, 2.2)  # float
    var c: Point[int]
    c.point(b)
    
    
    Run

Now how to turn that into? 
    
    
    c = point(b)
    
    
    Run

:-)