X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Focaml%2Fcic_unification%2FcoercDb.ml;h=437ad65ae202bcddab717c3fa5e5d327f63d6dfc;hb=4167cea65ca58897d1a3dbb81ff95de5074700cc;hp=e636f87596a8e9e86729bc2c5e0c99e072151b21;hpb=0245778d76e4d7656c1d8a05dc19738f1a953d68;p=helm.git

diff --git a/helm/ocaml/cic_unification/coercDb.ml b/helm/ocaml/cic_unification/coercDb.ml
index e636f8759..437ad65ae 100644
--- a/helm/ocaml/cic_unification/coercDb.ml
+++ b/helm/ocaml/cic_unification/coercDb.ml
@@ -24,7 +24,7 @@
  *)
 
 type coerc_carr = Uri of UriManager.uri | Sort of Cic.sort | Term of Cic.term
-exception EqCarrNotImplemented of string
+exception EqCarrNotImplemented of string Lazy.t
 exception EqCarrOnNonMetaClosed
 
 let db = ref []
@@ -44,18 +44,19 @@ let eq_carr src tgt =
   | Uri src, Uri tgt -> UriManager.eq src tgt
   | Sort (Cic.Type _), Sort (Cic.Type _) -> true
   | Sort src, Sort tgt when src = tgt -> true
-  | Term t1, Term t2 when 
-    CicUtil.is_meta_closed t1 && CicUtil.is_meta_closed t2 -> 
+  | Term t1, Term t2 ->
+    if CicUtil.is_meta_closed t1 && CicUtil.is_meta_closed t2 then
       raise 
         (EqCarrNotImplemented 
-          ("Unsupported carr for coercions: " ^ 
-            CicPp.ppterm t1 ^ " or " ^ CicPp.ppterm t2))
-  | _ -> raise EqCarrOnNonMetaClosed
+          (lazy ("Unsupported carr for coercions: " ^ 
+            CicPp.ppterm t1 ^ " or " ^ CicPp.ppterm t2)))
+    else raise EqCarrOnNonMetaClosed
+  | _, _ -> false
 
 let name_of_carr = function
   | Uri u -> UriManager.name_of_uri u
   | Sort s -> CicPp.ppsort s
-  | Term _ -> assert false
+  | Term t -> CicPp.ppterm t
   
 
 let to_list () =