X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fcic_acic%2FdoubleTypeInference.ml;h=7f93716b26c6685e1b3a2c74e3da64fc1b4d95cc;hb=1b36fc4540d93ff21c1afcf485e47e3fe3f26ddb;hp=1671b98d25321ca6492f8565715ba99d5ddfedba;hpb=6719c0e318b312b51b089fea3d69d1b7103245ea;p=helm.git

diff --git a/helm/software/components/cic_acic/doubleTypeInference.ml b/helm/software/components/cic_acic/doubleTypeInference.ml
index 1671b98d2..7f93716b2 100644
--- a/helm/software/components/cic_acic/doubleTypeInference.ml
+++ b/helm/software/components/cic_acic/doubleTypeInference.ml
@@ -339,17 +339,18 @@ let rec type_of_aux' subterms_to_types metasenv context t expectedty =
      | C.Lambda (n,s,t) ->
         (* Let's visit all the subterms that will not be visited later *)
          let _ = type_of_aux context s None in 
-         let expected_target_type =
+         let n, expected_target_type =
           match expectedty with
-             None -> None
+           | None -> n, None
            | Some expectedty' ->
-              let ty =
+              let n, ty =
                match R.whd context expectedty' with
-                  C.Prod (_,_,expected_target_type) ->
-                   beta_reduce expected_target_type
+                | C.Prod (n',_,expected_target_type) ->
+                   let xtt = beta_reduce expected_target_type in
+		   if n <> C.Anonymous then n, xtt else n', xtt
                 | _ -> assert false
               in
-               Some ty
+               n, Some ty
          in 
           let type2 =
            type_of_aux ((Some (n,(C.Decl s)))::context) t expected_target_type