From: Claudio Sacerdoti Coen <claudio.sacerdoticoen@unibo.it>
Date: Thu, 5 Feb 2004 11:04:43 +0000 (+0000)
Subject: Final answer: the local context MUST be normalized w.r.t. the canonical
X-Git-Tag: V_0_2_3~53
X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=commitdiff_plain;h=de4ba26867714c8df37c5c02d649b5e8581f00b5;p=helm.git

Final answer: the local context MUST be normalized w.r.t. the canonical
context before delifting w.r.t. it. Reason: we normalize it only lazily and
this is a right place to ``force'' the normalization.
---

diff --git a/helm/ocaml/cic_unification/cicMetaSubst.ml b/helm/ocaml/cic_unification/cicMetaSubst.ml
index 01b7d4a99..54f13ed11 100644
--- a/helm/ocaml/cic_unification/cicMetaSubst.ml
+++ b/helm/ocaml/cic_unification/cicMetaSubst.ml
@@ -230,7 +230,6 @@ let rec restrict subst to_be_restricted metasenv =
 (*CSC: maybe we should rename delift in abstract, as I did in my dissertation *)
 let delift n subst context metasenv l t =
  let module S = CicSubstitution in
-(* THIS CODE SHOULD NOT BE USEFUL AT ALL
   let l =
    let (_, canonical_context, _) = CicUtil.lookup_meta n metasenv in
    List.map2 (fun ct lt ->
@@ -239,7 +238,6 @@ let delift n subst context metasenv l t =
      | Some _, _ -> lt)
      canonical_context l
   in
-*)
   let to_be_restricted = ref [] in
   let rec deliftaux k =
    let module C = Cic in