From: acondolu <andrea.condoluci@unibo.it>
Date: Sun, 16 Jul 2017 14:01:21 +0000 (+0200)
Subject: subst does not replace anymore in branches of maches
X-Git-Tag: weak-reduction-separation~19
X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=commitdiff_plain;h=aee2672094ae2dc02d7bbafd566b279e3c1c53f5;p=fireball-separation.git

subst does not replace anymore in branches of maches

It was unnecessary: a match cannot expand to a previous branch

(cherry picked from commit 8a90160900bb95133b8e204a4fcadaa2db2f11dd)
---

diff --git a/ocaml/num.ml b/ocaml/num.ml
index 69c87e0..4f3c575 100644
--- a/ocaml/num.ml
+++ b/ocaml/num.ml
@@ -230,12 +230,13 @@ and subst truelam delift_by_one what (with_what : nf) (where : nf) =
    | `N _ as x -> x
    | `Match(t,v,bs_lift,bs,args) ->
        let bs_lift = bs_lift + if delift_by_one then -1 else 0 in
-       let l' = l - bs_lift  in
-       let with_what' = lift l' with_what in
+       (* let l' = l - bs_lift  in *)
+       (* let with_what' = lift l' (with_what :> nf) in *)
        (* The following line should be the identity when delift_by_one = true because we
           are assuming the ts to not contain lambda-bound variables. *)
-       bs := List.map (fun (n,t) -> n,subst truelam false what with_what' t) !bs ;
-       mk_match (cast_to_i_num_var (aux_i_num_var l t)) v bs_lift bs (List.map (aux l) args)
+       (* bs := List.map (fun (n,t) -> n,subst truelam false what with_what' t) !bs ; *)
+       let body = cast_to_i_num_var (aux_i_num_var l t) in
+       mk_match body v bs_lift bs (List.map (aux l) args)
  and aux l(*lift*) =
 (*function iii -> let res = match iii with*)
   function