Goal:
    G : t  s0 : VSet.t  x : V.t  u : VSet.elt  a : VSet.In u VSet.empty
  ============================
   (VSet.In ?a VSet.empty)


DEBUG:Going to execute:
eassumption
DEBUG LTAC Evaluated term: False_rect
DEBUG LTAC Evaluated term: VSet.empty_spec