# module M :
sig class x : int -> object method m : int end end = struct class x _ =
object method m = 42 end end;;
Error: Signature mismatch:
       Modules do not match:
         sig class x : 'a -> object method m : int end end
       is not included in
         sig class x : int -> object method m : int end end
       Class declarations do not match:
         class x : 'a -> object method m : int end
       does not match
         class x : int -> object method m : int end
       One parameter has type 'a but is expected to have type int