X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Facic_content%2Facic2astMatcher.ml;h=908aa942f8b34d7569e417a3fadc0d11e97d7282;hb=4e98c439731c6e110430a6c5217274215bf403b6;hp=d62786cc7a77316e65d11d4c8a6709bc31a42882;hpb=55b82bd235d82ff7f0a40d980effe1efde1f5073;p=helm.git

diff --git a/helm/software/components/acic_content/acic2astMatcher.ml b/helm/software/components/acic_content/acic2astMatcher.ml
index d62786cc7..908aa942f 100644
--- a/helm/software/components/acic_content/acic2astMatcher.ml
+++ b/helm/software/components/acic_content/acic2astMatcher.ml
@@ -77,9 +77,9 @@ struct
   module M = PatternMatcher.Matcher (Pattern32)
 
   let compiler rows =
-    let match_cb rows =
-      let pl, pid = try List.hd rows with Not_found -> assert false in
-      (fun matched_terms constructors ->
+    let match_cb rows matched_terms constructors =
+     HExtlib.list_findopt
+      (fun (pl,pid) _ ->
         let env =
           try
             List.map2
@@ -89,9 +89,23 @@ struct
                 | Ast.VarPattern name -> name, t
                 | _ -> assert false)
               pl matched_terms
-          with Invalid_argument _ -> assert false
+          with Invalid_argument _ -> assert false in
+        let rec check_non_linear_patterns =
+         function
+            [] -> true
+          | (name,t)::tl ->
+             List.for_all
+              (fun (name',t') ->
+                name <> name' ||
+                CicUtil.alpha_equivalence
+                 (Deannotate.deannotate_term t) (Deannotate.deannotate_term t')
+              ) tl && check_non_linear_patterns tl
         in
-        Some (env, constructors, pid))
+         if check_non_linear_patterns env then
+          Some (env, constructors, pid)
+         else
+          None
+      ) rows
     in
     M.compiler rows match_cb (fun () -> None)
 end