X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fextlib%2FhExtlib.ml;h=361587b7d33402f4d3989ffde01d72538a88deb6;hb=6bd49a71cfff3f29ee79da975678292861f9be0d;hp=e2063e451a692ccb25fa045de3f88b21c726a499;hpb=88381f8e48371c86d29eaeee8354ebfd651ab9e8;p=helm.git

diff --git a/helm/software/components/extlib/hExtlib.ml b/helm/software/components/extlib/hExtlib.ml
index e2063e451..361587b7d 100644
--- a/helm/software/components/extlib/hExtlib.ml
+++ b/helm/software/components/extlib/hExtlib.ml
@@ -539,6 +539,7 @@ let rec mk_list x = function
 ;;
 
 let list_seq start stop =
+  if start > stop then [] else
   let rec aux pos =
     if pos = stop then []
     else pos :: (aux (pos+1))