Using fields to define other fields

[Allosteric]

How can I get the following code run?
    
    
    type: Object = object
        size: int
        list0 : array[size, int]
        list1 : array[size, string]
        list2 : array[size, float]
    
    
    Run

As shown above, I would like to use the field `size` to determine the size of 
the array `list` s.