...

diff --git a/helm/software/matita/matitaExcPp.ml b/helm/software/matita/matitaExcPp.ml
index 126b78b89fc6702d08eff63a14a1708d172c64d9..24f25c5029d1c0941cd4aaae836ada8dda72bc75 100644 (file)
--- a/helm/software/matita/matitaExcPp.ml
+++ b/helm/software/matita/matitaExcPp.ml
@@ -159,6 +159,8 @@ let rec to_string =
      snd (to_string e)
   | NCicEnvironment.BadConstraint msg ->
      None, "NCicEnvironment bad constraint: " ^ Lazy.force msg
+  | NCicUnification.UnificationFailure msg ->
+     None, "NCicUnification failure: " ^ Lazy.force msg
   | CicTypeChecker.TypeCheckerFailure msg ->
      None, "Type checking error: " ^ Lazy.force msg
   | CicTypeChecker.AssertFailure msg ->