Goal:
    G : t  s : VSet.t  s' : VSet.t  x : V.t  y : V.t
  ============================
   (VSet.Subset s s' -> (lsp0 s x y <= lsp0 s' x y)%nbar)


DEBUG:Going to execute:
generalize eq_refl; pattern x at - 1; case x
DEBUG LTAC Evaluated term: (lsp0 s x y)
DEBUG LTAC Evaluated term: (lsp0 s x y)