#                               module Core :
  sig
    module Int :
      sig
        module T :
          sig
            type t = int
            val compare : 'a -> 'a -> t
            val ( + ) : t -> t -> t
          end
        type t = int
        val compare : 'a -> 'a -> t
        val ( + ) : t -> t -> t
        module Map :
          sig
            type key = t
            type 'a t = 'a Map.Make(T).t
            val empty : 'a t
            val is_empty : 'a t -> bool
            val mem : key -> 'a t -> bool
            val add : key -> 'a -> 'a t -> 'a t
            val singleton : key -> 'a -> 'a t
            val remove : key -> 'a t -> 'a t
            val merge :
              (key -> 'a option -> 'b option -> 'c option) ->
              'a t -> 'b t -> 'c t
            val compare : ('a -> 'a -> key) -> 'a t -> 'a t -> key
            val equal : ('a -> 'a -> bool) -> 'a t -> 'a t -> bool
            val iter : (key -> 'a -> unit) -> 'a t -> unit
            val fold : (key -> 'a -> 'b -> 'b) -> 'a t -> 'b -> 'b
            val for_all : (key -> 'a -> bool) -> 'a t -> bool
            val exists : (key -> 'a -> bool) -> 'a t -> bool
            val filter : (key -> 'a -> bool) -> 'a t -> 'a t
            val partition : (key -> 'a -> bool) -> 'a t -> 'a t * 'a t
            val cardinal : 'a t -> key
            val bindings : 'a t -> (key * 'a) list
            val min_binding : 'a t -> key * 'a
            val max_binding : 'a t -> key * 'a
            val choose : 'a t -> key * 'a
            val split : key -> 'a t -> 'a t * 'a option * 'a t
            val find : key -> 'a t -> 'a
            val map : ('a -> 'b) -> 'a t -> 'b t
            val mapi : (key -> 'a -> 'b) -> 'a t -> 'b t
          end
      end
    module Std : sig module Int = Int end
  end
#     #   val x : 'a Int.Map.t = <abstr>
# Characters 8-9:
  let y = x + x ;;
          ^
Error: This expression has type 'a Int.Map.t
       but an expression was expected of type int
#           module M : sig type t = A type u = C end
module N : sig type t = B end
# - : M.t = A
# - : N.t = B
# - : u = C
#   type t = M.t = A
type u = M.u = C
# - : u = C
#     module L : sig type v = V end
# - : v = V
#   module L : sig type v = V end
# - : v = V
#     type t1 = A
# module M1 : sig type u = v and v = t1 end
# module N1 : sig type u = v and v = t1 end
# type t1 = B
# module N2 : sig type u = v and v = N1.v end
#       module type PR6566 = sig type t = bytes end
# module PR6566 : sig type t = int end
# Characters 26-32:
  module PR6566' : PR6566 = PR6566;;
                            ^^^^^^
Error: Signature mismatch:
       Modules do not match: sig type t = int end is not included in PR6566
       Type declarations do not match:
         type t = int
       is not included in
         type t = bytes
#