X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=components%2Flibrary%2FcoercDb.ml;h=8b7982ea0576645c531fc82e5c599633ffcf39b2;hb=1f82709017e4ec5bab8e0311e00992b89572d856;hp=c5356b3e17fb2dfe1f4722b22b4a952643bf9464;hpb=a5f945ea6f0fc6df47d90d00a75b6e7cce8e008e;p=helm.git

diff --git a/components/library/coercDb.ml b/components/library/coercDb.ml
index c5356b3e1..8b7982ea0 100644
--- a/components/library/coercDb.ml
+++ b/components/library/coercDb.ml
@@ -59,12 +59,14 @@ let eq_carr src tgt =
   | Sort (Cic.Type _), Sort (Cic.Type _) -> true
   | Sort src, Sort tgt when src = tgt -> true
   | Term t1, Term t2 ->
-    if CicUtil.is_meta_closed t1 && CicUtil.is_meta_closed t2 then
-      raise 
-        (EqCarrNotImplemented 
+      if t1 = t2 then true
+      else
+        if CicUtil.is_meta_closed t1 && CicUtil.is_meta_closed t2 then
+          raise 
+          (EqCarrNotImplemented 
           (lazy ("Unsupported carr for coercions: " ^ 
-            CicPp.ppterm t1 ^ " or " ^ CicPp.ppterm t2)))
-    else raise EqCarrOnNonMetaClosed
+          CicPp.ppterm t1 ^ " or " ^ CicPp.ppterm t2)))
+      else raise EqCarrOnNonMetaClosed
   | _, _ -> false
 
 let to_list () =