X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fcontent_pres%2FcicNotationParser.ml;h=95b688c548b0f4565dcecddff4c777e26477c546;hb=b7e730726f5c5ba9b53b80d3881bcacd38a11a67;hp=829e78b6d0d16476e4e73a968436c2774ec523b5;hpb=65e8f1ba961ef81c5604168e7f1c891063c1ec76;p=helm.git

diff --git a/helm/software/components/content_pres/cicNotationParser.ml b/helm/software/components/content_pres/cicNotationParser.ml
index 829e78b6d..95b688c54 100644
--- a/helm/software/components/content_pres/cicNotationParser.ml
+++ b/helm/software/components/content_pres/cicNotationParser.ml
@@ -246,9 +246,14 @@ let compare_rule_id x y =
     | [],[] -> 0
     | [],_ -> ~-1
     | _,[] -> 1
-    | ((s1::tl1) as x),((s2::tl2) as y) ->
+    | ((s1::tl1) ),((s2::tl2) ) ->
         if Gramext.eq_symbol s1 s2 then aux (tl1,tl2)
-        else Pervasives.compare x y 
+        else 
+          let res = 
+            try Pervasives.compare s1 s2 
+            with Invalid_argument _ -> 0 
+          in
+           if res = 0 then aux (tl1, tl2) else res 
   in
     aux (x,y)