(*
    ||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_______________________________________________________________ *)

exception TypeError of Brg.message

type machine

val empty_machine: machine

val get: (Brg.attrs -> Brg.bind -> 'a) -> machine -> int -> 'a

val push: (machine -> 'a) -> machine -> Brg.attrs -> Brg.bind -> 'a

(* arguments: expected type, inferred type, typed term *) 
val assert_conversion:
   (unit -> 'a) -> ?si:bool -> ?rt:bool -> 
   machine -> Brg.term -> Brg.term -> Brg.term -> 'a

val message1: 
   string -> machine -> Brg.term -> (Brg.context, Brg.term) Log.message