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Module Tuple = Core_kernel.Tuple

Signature

module T2 : sig .. end
Signature for a 2-tuple module
module T3 : sig .. end
Signature for a 3-tuple module

These functors allow users to write: 


   module Foo = struct
     include Tuple.Make       (String) (Int)
     include Tuple.Comparable (String) (Int)
     include Tuple.Hashable   (String) (Int)
     include Tuple.Binable    (String) (Int)
   end
module Make (T1 : sig .. end) (T2 : sig .. end) : sig .. end
module type Comparable_sexpable = sig .. end
module type Hashable_sexpable = sig .. end
module Hashable (S1 : Hashable_sexpable) (S2 : Hashable_sexpable) : Hashable_sexpable with type t := Make(S1)(S2).t
The difference between Hashable and Hashable_t functors is that the former's result type doesn't contain type t and the latter does.