(*
    ||M||  This file is part of HELM, an Hypertextual, Electronic        
    ||A||  Library of Mathematics, developed at the Computer Science     
    ||T||  Department, University of Bologna, Italy.                     
    ||I||                                                                
    ||T||  HELM is free software; you can redistribute it and/or         
    ||A||  modify it under the terms of the GNU General Public License   
    \   /  version 2 or (at your option) any later version.      
     \ /   This software is distributed as is, NO WARRANTY.     
      V_______________________________________________________________ *)

(* $Id$ *)

exception UnificationFailure of string Lazy.t;;
exception Uncertain of string Lazy.t;;
exception AssertFailure of string Lazy.t;;

val set_refiner_typeof:
 (NRstatus.status ->
   ?localise:(NCic.term -> Stdpp.location) ->
   NCic.metasenv -> NCic.substitution -> NCic.context ->
   NCic.term -> NCic.term option -> (* term, expected type *)
     NCic.metasenv * NCic.substitution * NCic.term * NCic.term) -> unit

val unify :
  #NRstatus.status ->
  ?test_eq_only:bool -> (* default: false *)
  NCic.metasenv -> NCic.substitution -> NCic.context -> 
  NCic.term -> NCic.term ->
   NCic.metasenv * NCic.substitution

(* this should be moved elsewhere *)
val fix_sorts: NCic.term -> NCic.term

val delift_term_wrt_terms:
  #NRstatus.status -> 
  NCic.metasenv -> NCic.substitution -> NCic.context -> 
  NCic.term -> NCic.term list ->
   NCic.metasenv * NCic.substitution * NCic.term