Goal:
  
  x : V.t
  s : VSet.t
  s' : VSet.t
  s'' : VSet.t
  da : VSet.Subset s s'
  i : VSet.elt
  disj : ~ VSet.In i (VSet.inter s' s'')
  ininter : VSet.In i (VSet.inter s s'')
  ============================
   (VSet.In i (VSet.inter s' s''))


DEBUG:Going to execute:
match goal with
           | H:?P
             |- _ =>
                 match type of P with
                 | Prop =>
                     match goal with
                     | H':context [ H ] |- _ => clear dependent H'
                     end
                 | _ => fail
                 end; VSetDecide.MSetDecideAuxiliary.no_logical_interdep
           | _ => idtac
           end