X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=components%2Ftactics%2Fparamodulation%2Finference.ml;h=a27116bc9f007e232f1d1f9856140fea683f6b86;hb=f27a3e2fa6aee86ef255842b51bdfa8a92a99ce5;hp=1c3daffecf3fc1daff35973004d6d645e58fde74;hpb=e507075709b73f1e62e6f3f555675063087140ec;p=helm.git

diff --git a/components/tactics/paramodulation/inference.ml b/components/tactics/paramodulation/inference.ml
index 1c3daffec..a27116bc9 100644
--- a/components/tactics/paramodulation/inference.ml
+++ b/components/tactics/paramodulation/inference.ml
@@ -331,12 +331,38 @@ let utty_of_u u =
   u, t, ty
 ;;
 
-let find_library_equalities dbd context status maxmeta = 
+let find_library_equalities caso_strano dbd context status maxmeta = 
   let module C = Cic in
   let module S = CicSubstitution in
   let module T = CicTypeChecker in
   let _ = <:start<equations_for_goal>> in
-  let eqs = (MetadataQuery.equations_for_goal ~dbd status) in
+  let signature = 
+    if caso_strano then
+      begin
+        let proof, goalno = status in
+        let _,metasenv,_,_ = proof in
+        let metano,context,ty = CicUtil.lookup_meta goalno metasenv in
+        match ty with
+        | Cic.Appl[Cic.MutInd(u,0,_);eq_ty;l;r] ->
+            (let mainl, sigl = MetadataConstraints.signature_of l in
+            let mainr, sigr = MetadataConstraints.signature_of r in
+            match mainl,mainr with
+            | Some (uril,tyl), Some (urir, tyr) 
+                when LibraryObjects.is_eq_URI uril && 
+                     LibraryObjects.is_eq_URI urir && 
+                     tyl = tyr ->
+                  Some (mainl,MetadataConstraints.UriManagerSet.union sigl sigr)
+            | _ -> 
+                let u = (UriManager.uri_of_string
+                  (UriManager.string_of_uri u ^ "#xpointer(1/1)")) in
+                let main = Some (u, []) in
+                Some (main,MetadataConstraints.UriManagerSet.union sigl sigr))
+        | _ -> assert false
+      end
+    else
+      None
+  in
+  let eqs = (MetadataQuery.equations_for_goal ~dbd ?signature status) in
   let _ = <:stop<equations_for_goal>> in
   let candidates =
     List.fold_left