Goal:
    G : t  HI : invariants
  ============================
   (forall x : VSet.elt,
    ssrbool.reflect (lsp x x = Some 0)
      match lsp x x with
      | Some 0 => true
      | _ => false
      end)


DEBUG:Going to execute:
intro x
DEBUG LTAC Evaluated term: VSet_Forall_reflect