In ocaml 3.07 and 3.08, it seems that in the signature of a module one 
can not refer to a module type defined in a mutually recursive module. 
This example does not compile:
-------------------------------------
# module rec A:
  sig
    module type w=sig end
  end=
  struct
    module type w = sig end
  end
and B:
    sig
      module Z(X:A.w):sig end
    end =
      struct
        module Z (X:A.w)=struct end
      end
;;
                            Characters 131-134:
        module Z(X:A.w):sig end
                   ^^^
Unbound module type A.w
-----------------------------------------------

however, this one does compile just fine:
---------------------------------
# module rec A:
  sig
    module type w=sig end
  end=
  struct
    module type w = sig end
  end
and B:
    sig
      module Z(X:sig end):sig end
    end =
      struct
        module Z (X:A.w)=struct end
      end
;;

-------------------------------

is there a reason why this happens?

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