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 : sweight (simplify2' G p) <= z
  H : weight p <= sweight (simplify2' G p)
  ============================
   (weight p <= z)


DEBUG:Going to execute:
intros; Zify.zify_pre_hook; zify_elim_let; zify_op