Goal:
  
  G : t
  s0 : VSet.t
  s' : VSet.t
  x : V.t
  y : V.t
  z : V.t
  p : SPath s0 x y
  t0 : VSet.t
  t1 : V.t
  hin : Disjoint t0 s'
  q : SPath s' t1 z
  ============================
   (VSet.Subset s' (VSet.union t0 s'))


DEBUG:Going to execute:
unfold iff in *; fold any not; intros;
            VSetDecide.MSetDecideAuxiliary.abstract_elements;
            VSetDecide.MSetDecideAuxiliary.no_logical_interdep; decompose
            records; VSetDecide.MSetDecideAuxiliary.discard_nonMSet;
            unfold VSet.Empty, VSet.Subset, VSet.Equal in *; 
            intros; VSetDecide.MSetDecideAuxiliary.change_to_E_t;
            VSetDecide.MSetDecideAuxiliary.E_eq_to_Logic_eq; subst ++;
            VSetDecide.MSetDecideAuxiliary.Logic_eq_to_E_eq; pull not using
            MSet_decidability; unfold not in *