package dedukti

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package dedukti

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exception Not_registered_processor

raise by get_processor if the processor has not be registered

type (_, _) equal =

| Refl : 'a -> ('a, 'a) equal

we used GADTs of OCaml to declare an equality type

type equality = {

equal : 'a 'b. ('a t * 'b t) -> ('a t, 'b t) equal option;

}

This record uses polymorism of rank 2. This is because internally we need to compare values of types 'a t and 'b t. Hence the "for all quantifier" on types cannot be in prenex form in the function register_processor. We use the GADT above to keep track of the dependency.

val register_processor : 
  'a t ->
  equality ->
  (module S with type t = 'a) ->
  unit

register_processor processor f_eq (module P) associate the [processor] to the module [P]. ASSERT: f_eq processor processor = (Some Refl processor) ASSERT: f_eq _ _ = None