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 add : key -> 'a -> 'a t -> 'a t
            val add_to_list : key -> 'a -> 'a list t -> 'a list t
            val update : key -> ('a option -> 'a option) -> '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 union :
              (key -> 'a -> 'a -> 'a option) -> '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 min_binding_opt : 'a t -> (key * 'a) option
            val max_binding : 'a t -> key * 'a
            val max_binding_opt : 'a t -> (key * 'a) option
            val choose : 'a t -> key * 'a
            val choose_opt : 'a t -> (key * 'a) option
            val find : key -> 'a t -> 'a
            val find_opt : key -> 'a t -> 'a option
            val find_first : (key -> bool) -> 'a t -> key * 'a
            val find_first_opt : (key -> bool) -> 'a t -> (key * 'a) option
            val find_last : (key -> bool) -> 'a t -> key * 'a
            val find_last_opt : (key -> bool) -> 'a t -> (key * 'a) option
            val iter : (key -> 'a -> unit) -> 'a t -> unit
            val fold : (key -> 'a -> 'acc -> 'acc) -> 'a t -> 'acc -> 'acc
            val map : ('a -> 'b) -> 'a t -> 'b t
            val mapi : (key -> 'a -> 'b) -> 'a t -> 'b t
            val filter : (key -> 'a -> bool) -> 'a t -> 'a t
            val filter_map : (key -> 'a -> 'b option) -> 'a t -> 'b t
            val partition : (key -> 'a -> bool) -> 'a t -> 'a t * 'a t
            val split : key -> 'a t -> 'a t * 'a option * 'a t
            val is_empty : 'a t -> bool
            val mem : key -> 'a t -> bool
            val equal : ('a -> 'a -> bool) -> 'a t -> 'a t -> bool
            val compare : ('a -> 'a -> key) -> 'a t -> 'a t -> key
            val for_all : (key -> 'a -> bool) -> 'a t -> bool
            val exists : (key -> 'a -> bool) -> 'a t -> bool
            val to_list : 'a t -> (key * 'a) list
            val of_list : (key * 'a) list -> 'a t
            val to_seq : 'a t -> (key * 'a) Seq.t
            val to_rev_seq : 'a t -> (key * 'a) Seq.t
            val to_seq_from : key -> 'a t -> (key * 'a) Seq.t
            val add_seq : (key * 'a) Seq.t -> 'a t -> 'a t
            val of_seq : (key * 'a) Seq.t -> 'a t
          end
      end
    module Std : sig module Int = Int end
  end
val x : 'a Int.Map.t = <abstr>
Line 1, characters 8-9:
1 | let y = x + x ;;
            ^
Error: The value x 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 = string end
module PR6566 : sig type t = int end
Line 1, characters 26-32:
1 | 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 = string
       The type t is not equal to the type string
module A : sig module B : sig type t = T end end
module M2 : sig type u = A.B.t type foo = int type v = u end