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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 Univ
open UnivSubst
(** Unordered pairs of universe levels (ie (u,v) = (v,u)) *)
module UPairSet : CSet.S with type elt = (Level.t * Level.t)
(** Simplification and pruning of constraints:
[normalize_context_set ctx us]
- Instantiate the variables in [us] with their most precise
universe levels respecting the constraints.
- Normalizes the context [ctx] w.r.t. equality constraints,
choosing a canonical universe in each equivalence class
(a global one if there is one) and transitively saturate
the constraints w.r.t to the equalities. *)
val normalize_context_set : UGraph.t -> ContextSet.t ->
universe_opt_subst (* The defined and undefined variables *) ->
LSet.t (* univ variables that can be substituted by algebraics *) ->
UPairSet.t (* weak equality constraints *) ->
(universe_opt_subst * LSet.t) in_universe_context_set
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