From: wester@ilt.fhg.de

> class myclass ?(n=0) () =
>   object  
>    val nn = n;
>    method get_nn = nn
>    method clone (na: int) = let (mc: myclass) = new myclass ~n:na () in mc;
> end;;
>  
> that produces the following error message in the toplevel:
> 
>           Characters 5-153:
> The expression "new myclass" has type ?n:int -> unit -> myclass
> but is used with type int -> unit -> myclass

What version of ocaml are you using ?

At least, I couldn't reproduce the problem with 3.01:

        Objective Caml version 3.01

# class myclass ?(n=0) () =
    object  
     val nn = n;
     method get_nn = nn
     method clone (na: int) = let (mc: myclass) = new myclass ~n:na () in mc;
    end;;
class myclass :
  ?n:int ->
  unit ->
  object val nn : int method clone : int -> myclass method get_nn : int end

And this both with the -labels option on and off.
By the way, you don't need all these annotations in the clone method:
 method clone na = new myclass ~n:na ()

Regards,

Jacques Garrigue
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