X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Focaml%2Fcic_proof_checking%2FcicSubstitution.ml;fp=helm%2Focaml%2Fcic_proof_checking%2FcicSubstitution.ml;h=a30a036cb42dc7726c1720906d706f903b0fcf30;hb=f1dc70ca55058b2983cd23b829d856df3b41b9a7;hp=372c66fb8599d6d2178def9e77517ae9bd84d22f;hpb=92d309b1cad63ffc1608482a966a6d0af0a51c8e;p=helm.git

diff --git a/helm/ocaml/cic_proof_checking/cicSubstitution.ml b/helm/ocaml/cic_proof_checking/cicSubstitution.ml
index 372c66fb8..a30a036cb 100644
--- a/helm/ocaml/cic_proof_checking/cicSubstitution.ml
+++ b/helm/ocaml/cic_proof_checking/cicSubstitution.ml
@@ -191,7 +191,7 @@ let subst arg =
 (*CSC: dovrebbe diventare da sinistra verso destra:                      *)
 (*CSC: t{a=a/A;b/a} ==> \H:a=a.H{b/a} ==> \H:b=b.H                       *)
 (*CSC: per la roba che proviene da Coq questo non serve!                 *)
-let subst_vars exp_named_subst =
+let subst_vars exp_named_subst t =
 (*
 debug_print (lazy ("@@@POSSIBLE BUG: SUBSTITUTION IS NOT SIMULTANEOUS")) ;
 *)
@@ -344,7 +344,8 @@ if List.mem uri params then debug_print (lazy "---- OK2") ;
    List.map (function (uri,t) -> (uri,substaux k t)) exp_named_subst' @
     (filter_and_lift exp_named_subst)
  in
-  substaux 1
+  if exp_named_subst = [] then t
+  else substaux 1 t
 ;;
 
 (* subst_meta [t_1 ; ... ; t_n] t                                *)