module type SeededHashedType = Hashtbl.SeededHashedType
type 
The type of the hashtable keys.
val equal : t -> t -> bool
The equality predicate used to compare keys.
val hash : int -> t -> int
A seeded hashing function on keys.  The first argument is
          the seed.  It must be the case that if 
equal x y is true,
          then 
hash seed x = hash seed y for any value of 
seed.
          A suitable choice for 
hash is the function 
Hashtbl.seeded_hash
          below.
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