1 (* Copyright (C) 2000, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
7 * HELM is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * HELM is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with HELM; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22 * For details, see the HELM World-Wide-Web page,
23 * http://cs.unibo.it/helm/.
26 exception AssertFailure of string
27 exception UnificationFailure of string
29 (* fo_unif metasenv context t1 t2 *)
30 (* unifies [t1] and [t2] in a context [context]. *)
31 (* Only the metavariables declared in [metasenv] *)
32 (* can be used in [t1] and [t2]. *)
33 (* The returned substitution can be directly *)
34 (* withouth first unwinding it. *)
36 Cic.metasenv -> Cic.context -> Cic.term -> Cic.term ->
37 CicMetaSubst.substitution * Cic.metasenv
39 (* fo_unif_subst metasenv subst context t1 t2 *)
40 (* unifies [t1] and [t2] in a context [context] *)
41 (* and with [subst] as the current substitution *)
42 (* (i.e. unifies ([subst] [t1]) and *)
43 (* ([subst] [t2]) in a context *)
44 (* ([subst] [context]) using the metasenv *)
45 (* ([subst] [metasenv]) *)
46 (* Only the metavariables declared in [metasenv] *)
47 (* can be used in [t1] and [t2]. *)
48 (* [subst] and the substitution returned are not *)
50 (*CSC: fare un tipo unione Unwinded o ToUnwind e fare gestire la
51 cosa all'apply_subst!!!*)
53 CicMetaSubst.substitution ->
54 Cic.context -> Cic.metasenv -> Cic.term -> Cic.term ->
55 CicMetaSubst.substitution * Cic.metasenv