Goal:
  
  G : t
  HI : invariants
  HG : acyclic_no_loop
  s : VSet.t
  x : V.t
  H : (Some 0 <= lsp0 s x x)%nbar
  n : Z
  p : SPath s x x
  Hp : sweight p = n
  H0 : 0 <= n
  ============================
   (Some n = Some 0)


DEBUG:Going to execute:
<coq-core.plugins.ssreflect::ssrrewrite@0> $1 $2
DEBUG LTAC Evaluated term: (lsp0_spec_eq0 n Hn)
DEBUG LTAC Evaluated term: lsp0_spec_eq
DEBUG LTAC Evaluated term: Hn