added "already defined"

diff --git a/helm/software/matita/matitaExcPp.ml b/helm/software/matita/matitaExcPp.ml
index 24f25c5029d1c0941cd4aaae836ada8dda72bc75..fa07a3d9e78b6969d9d57542eeadcdb5c4438a81 100644 (file)
--- a/helm/software/matita/matitaExcPp.ml
+++ b/helm/software/matita/matitaExcPp.ml
@@ -152,6 +152,8 @@ let rec to_string =
      None, "NTypeChecker assert failure: " ^ Lazy.force msg
   | NCicEnvironment.ObjectNotFound msg ->
      None, "NCicEnvironment object not found: " ^ Lazy.force msg
+  | NCicEnvironment.AlreadyDefined msg ->
+     None, "NCicEnvironment already defined: " ^ Lazy.force msg
   | NCicRefiner.AssertFailure msg ->
      None, "NRefiner assert failure: " ^ Lazy.force msg
   | NCicEnvironment.BadDependency (msg,e) ->