X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=components%2Facic_procedural%2FproceduralMode.ml;h=2b233a4bf358e4fc18d9f2de8bc6cb265b0b42e8;hb=a2f9236b189b39bb5e7d864991cae29c9f9cb67f;hp=bd2c3a438c9fce26563f6eb04a6917dad5246a0d;hpb=8f5b25b6091f1e240f37de5355e7a99b756e98e8;p=helm.git

diff --git a/components/acic_procedural/proceduralMode.ml b/components/acic_procedural/proceduralMode.ml
index bd2c3a438..2b233a4bf 100644
--- a/components/acic_procedural/proceduralMode.ml
+++ b/components/acic_procedural/proceduralMode.ml
@@ -24,8 +24,15 @@
  *)
 
 module C  = Cic
+
+module P = ProceduralPreprocess
 module Cl = ProceduralClassify
 
+let is_eliminator = function
+   | _ :: C.MutInd _ :: _               -> true
+   | _ :: C.Appl (C.MutInd _ :: _) :: _ -> true
+   | _                                  -> false
+
 let is_const = function
    | C.Sort _
    | C.Const _ 
@@ -41,5 +48,10 @@ let rec is_appl b = function
    | _                 -> false 
 
 let bkd c t =
-   let ts, _ = Cl.split c t in
-   is_appl true (List.hd ts)
+   let classes, rc = Cl.classify c t in
+   let premises, _ = P.split c t in
+   match rc with
+      | Some (i, j) when i > 1 && i <= List.length classes && is_eliminator premises -> true
+      | _ ->
+         let ts, _ = P.split c t in
+         is_appl true (List.hd ts)