Goal:
  
  G : t
  HI : invariants G
  HG : acyclic_no_loop G
  y_0 : V.t
  x_0 : V.t
  Vx : VSet.In x_0 (V G)
  Vy : VSet.In y_0 (V G)
  K : Z
  Hxs : lsp0 G (V G) x_0 y_0 = Some K
  x : V.t
  y : V.t
  p : PathOf G x y
  z : Z
  ineq : (Some (sweight (simplify2' G p)) <= Some z)%nbar
  ============================
   (exists n : Z, Some z = Some n /\ weight p <= n)


DEBUG:Going to execute:
eexists
DEBUG LTAC Evaluated term: (lsp0_spec_le G (simplify2' G p))
DEBUG LTAC Evaluated term: (lsp0 G (V G) x y)