From: Claudio Sacerdoti Coen <claudio.sacerdoticoen@unibo.it>
Date: Wed, 17 Dec 2003 11:49:58 +0000 (+0000)
Subject: Big bug spotted and commented: the delift function considers the explicit
X-Git-Tag: V_0_5_1_3~60
X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=commitdiff_plain;h=36ffad7c7847e28c3275897547a7308929748455;p=helm.git

Big bug spotted and commented: the delift function considers the explicit
substitution over metavariable occurrences as telescopic. Instead it is
simultaneous.
---

diff --git a/helm/ocaml/cic_unification/cicUnification.ml b/helm/ocaml/cic_unification/cicUnification.ml
index 7221dd0a8..bc736b260 100644
--- a/helm/ocaml/cic_unification/cicUnification.ml
+++ b/helm/ocaml/cic_unification/cicUnification.ml
@@ -91,6 +91,9 @@ let delift context metasenv l t =
         in
          C.Var (uri,exp_named_subst')
      | C.Meta (i, l1) as t -> 
+(* CSC: BIG BUG HERE! In the explicit substitution l1 = [t1 ; t2],       *)
+(* CSC: it is NOT true that Rel(1) in t2 refers to t1 (i.e. the explicit *)
+(* CSC: substitution is simultaneous, not telescopic. To be fixes ASAP.  *)
         let rec deliftl j =
          function
             [] -> []