How can we use operators as type names

[idobai]

Hi, the question is in the title, here's a sample:
    
    
    type `!`* = enum A B C
    
    proc stuff(p: !): void = echo p # (3, 16) Error: expression expected, but 
found ')'
    
    

and another:
    
    
    type
     `?`*[T] = object of RootObj
       case isDefined* : bool
       of true : value* : T
       of false : nil
    
    proc some*[T](val: T): auto =
      ?[T](isDefined: true, value: val)
    
    proc none*[T](): auto = ?[T](isDefined: false)
    
    proc `$`*[T](option: ?[T]): string = #(12, 23) Error: type mismatch: got 
(array[0..0, T]) but expected '? = CompositeTypeClass'
     if ?option : result = "some(" & $option.value & ")"
     else : result = "none"
    

Thanks!