X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Focaml%2Fcic_unification%2FcoercGraph.ml;h=b3bc8d8b0e7ba5b94284102bfc4a68c9db1941bb;hb=af364f229a858464cc557e60e314b6ffb20b6625;hp=2e69c648657646867879bebbdafd49148ea7212c;hpb=8b55faddb06e3c4b0a13839210bb49170939b33e;p=helm.git

diff --git a/helm/ocaml/cic_unification/coercGraph.ml b/helm/ocaml/cic_unification/coercGraph.ml
index 2e69c6486..b3bc8d8b0 100644
--- a/helm/ocaml/cic_unification/coercGraph.ml
+++ b/helm/ocaml/cic_unification/coercGraph.ml
@@ -67,13 +67,19 @@ let look_for_coercion src tgt =
  * (source, list of coercions to follow, target)
  *)
 let get_closure_coercions src tgt uri coercions =
+  let eq_carr s t = 
+    try
+      CoercDb.eq_carr s t
+    with
+    | CoercDb.EqCarrNotImplemented _ | CoercDb.EqCarrOnNonMetaClosed -> false
+  in
   match src,tgt with
   | CoercDb.Uri _, CoercDb.Uri _ ->
       let c_from_tgt = 
-        List.filter (fun (f,_,_) -> CoercDb.eq_carr f tgt) coercions 
+        List.filter (fun (f,_,_) -> eq_carr f tgt) coercions 
       in
       let c_to_src = 
-        List.filter (fun (_,t,_) -> CoercDb.eq_carr t src) coercions 
+        List.filter (fun (_,t,_) -> eq_carr t src) coercions 
       in
         (List.map (fun (_,t,u) -> src,[uri; u],t) c_from_tgt) @
         (List.map (fun (s,_,u) -> s,[u; uri],tgt) c_to_src) @