Hello,

Accidentally I'm running into the same problem. I'd like to have a 
polymorphic Hashtbl that uses physical equality. Using Hashtbl.Make is 
not possible since the type t of the input signature HashedType has no 
variable.

More precisely I would like to have a key with the following type

type 'a 'b key = 'a option * 'b option

and the following equal function,

let equal k k' = match k, k' with
| (Some x, y), (Some x', y') -> if x == x' then y = y' else false
| _, _ -> k = k'

which tests for physical equality when the first component of the key 
is "Some" in both keys.

Any hints besides those already suggested ?

Daniel

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