Goal:
    G : t  s0 : VSet.t  x : V.t  e : x = x
  ============================
   (forall (l : list Nbar.t) (acc : Nbar.t),
    (Some 0 <= acc)%nbar -> (Some 0 <= fold_left max l acc)%nbar)


DEBUG:Going to execute:
idtac
DEBUG LTAC Evaluated term: (forall (l : list Nbar.t) (acc : Nbar.t),
                            (Some 0 <= acc)%nbar ->
                            (Some 0 <= fold_left max l acc)%nbar)