Recursive Function type

[TinBryn]

To do this in C++ I would overload `operator()` you can do the same in Nim
    
    
    {.experimental: "callOperator".}
    
    type
      Function* = object
    
    proc `()`*(f: Function, i: int): Function =
      ## do your logic here
    
    var f: Function
    
    f = f(1)
    f = f(2)
    
    
    Run

If you don't want to use experimental features you could call this something 
else.