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(************************************************************************)
(* * The Coq Proof Assistant / The Coq Development Team *)
(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *)
(* <O___,, * (see CREDITS file for the list of authors) *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(* * (see LICENSE file for the text of the license) *)
(************************************************************************)
open Constr
open Univ
(** {6 Constraints for type inference}
When doing conversion of universes, not only do we have =/<= constraints but
also Lub constraints which correspond to unification of two levels which might
not be necessary if unfolding is performed.
UWeak constraints come from irrelevant universes in cumulative polymorphism.
*)
type t =
| ULe of Universe.t * Universe.t
| UEq of Universe.t * Universe.t
| ULub of Level.t * Level.t
| UWeak of Level.t * Level.t
val is_trivial : t -> bool
module Set : sig
include Set.S with type elt = t
val pr : t -> Pp.t
val subst_univs : universe_subst_fn -> t -> t
end
type 'a accumulator = Set.t -> 'a -> 'a option
type 'a constrained = 'a * Set.t
type 'a constraint_function = 'a -> 'a -> Set.t -> Set.t
val enforce_eq_instances_univs : bool -> Instance.t constraint_function
(** With [force_weak] UWeak constraints are turned into equalities,
otherwise they're forgotten. *)
val to_constraints : force_weak:bool -> UGraph.t -> Set.t -> Constraint.t
(** [eq_constr_univs_infer_With kind1 kind2 univs m n] is a variant of
{!eq_constr_univs_infer} taking kind-of-term functions, to expose
subterms of [m] and [n], arguments. *)
val eq_constr_univs_infer_with :
(constr -> (constr, types, Sorts.t, Univ.Instance.t) kind_of_term) ->
(constr -> (constr, types, Sorts.t, Univ.Instance.t) kind_of_term) ->
UGraph.t -> 'a accumulator -> constr -> constr -> 'a -> 'a option
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