Goal:
    x : VSet.elt  y : VSet.elt  p : VSet.t  H : x <> y
  ============================
   (VSetDecide.MSetDecideAuxiliary.MSet_Prop (x <> y))


DEBUG:Going to execute:
t
DEBUG LTAC Evaluated term: (VSetDecide.MSetDecideAuxiliary.MSet_Prop (x <> y))