parseint not defined for char.

[Araq]

Nah, read Sedgewick first. ;-)

> But I still don't know what static type I should use to replace strings 
> (pre-defined arrays of characters ?).
    
    
    type
      Filename = distinct string
      Displayname = distinct string
      Option = enum ...
      Options = set[Option]
    
    
    Run

etc.