X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fcic_proof_checking%2FcicReduction.ml;h=b636c2a729aa2ef688d99a8c8a42e0c173b795f5;hb=d5c1f34cd226898525168e470d3e2ec273699826;hp=ce8f66deb04aa554763f84ecf26299622aed11ac;hpb=e1676c7a2d2199102d6c6be22b6c248ce4e12860;p=helm.git

diff --git a/helm/software/components/cic_proof_checking/cicReduction.ml b/helm/software/components/cic_proof_checking/cicReduction.ml
index ce8f66deb..b636c2a72 100644
--- a/helm/software/components/cic_proof_checking/cicReduction.ml
+++ b/helm/software/components/cic_proof_checking/cicReduction.ml
@@ -1116,7 +1116,7 @@ let normalize ?delta ?subst ctx term =
   
   
 (* performs an head beta/cast reduction *)
-let rec head_beta_reduce =
+let rec head_beta_reduce ?(delta=false) =
  function
     (Cic.Appl (Cic.Lambda (_,_,t)::he'::tl')) ->
       let he'' = CicSubstitution.subst he' t in
@@ -1128,8 +1128,33 @@ let rec head_beta_reduce =
             Cic.Appl l -> Cic.Appl (l@tl')
           | _ -> Cic.Appl (he''::tl')
         in
-         head_beta_reduce he'''
-  | Cic.Cast (te,_) -> head_beta_reduce te
+         head_beta_reduce ~delta he'''
+  | Cic.Cast (te,_) -> head_beta_reduce ~delta te
+  | Cic.Appl (Cic.Const (uri,ens)::tl) as t when delta=true ->
+     let bo =
+      match fst (CicEnvironment.get_cooked_obj CicUniv.empty_ugraph uri) with
+         Cic.Constant (_,bo,_,_,_) -> bo
+       | Cic.Variable _ -> raise ReferenceToVariable
+       | Cic.CurrentProof (_,_,bo,_,_,_) -> Some bo
+       | Cic.InductiveDefinition _ -> raise ReferenceToInductiveDefinition
+     in
+      (match bo with
+          None -> t
+        | Some bo ->
+           head_beta_reduce
+            ~delta (Cic.Appl ((CicSubstitution.subst_vars ens bo)::tl)))
+  | Cic.Const (uri,ens) as t when delta=true ->
+     let bo =
+      match fst (CicEnvironment.get_cooked_obj CicUniv.empty_ugraph uri) with
+         Cic.Constant (_,bo,_,_,_) -> bo
+       | Cic.Variable _ -> raise ReferenceToVariable
+       | Cic.CurrentProof (_,_,bo,_,_,_) -> Some bo
+       | Cic.InductiveDefinition _ -> raise ReferenceToInductiveDefinition
+     in
+      (match bo with
+          None -> t
+        | Some bo ->
+           head_beta_reduce ~delta (CicSubstitution.subst_vars ens bo))
   | t -> t
 
 (*