Goal:
    G : t  x : V.t  y : V.t  n : Z  p : SPath (V G) x y  Hp : sweight p = n
  ============================
   (forall l : labelling,
    correct_labelling l -> Z.of_nat (l x) + n <= Z.of_nat (l y))


DEBUG:Going to execute:
intros l Hl
DEBUG LTAC Evaluated term: lsp0_spec_eq