2 ||M|| This file is part of HELM, an Hypertextual, Electronic
3 ||A|| Library of Mathematics, developed at the Computer Science
4 ||T|| Department, University of Bologna, Italy.
6 ||T|| HELM is free software; you can redistribute it and/or
7 ||A|| modify it under the terms of the GNU General Public License
8 \ / version 2 or (at your option) any later version.
9 \ / This software is distributed as is, NO WARRANTY.
10 V_______________________________________________________________ *)
12 let empty_subst = [];;
14 let buildsubst n t tail = (n,t) :: tail ;;
16 let rec lookup_subst var subst =
20 lookup_subst (List.assoc i subst) subst
26 let is_in_subst i subst = List.mem_assoc i subst;;
28 (* filter out from metasenv the variables in substs *)
29 let filter subst varlist =
32 not (is_in_subst m subst))