Goal:
    _z_ : VSet.t  x0 : V.t  x1 : V.t  x2 : V.t  a : V.t
  ============================
   (VSet.In a (VSet.add x0 (VSet.add x1 (VSet.add x2 _z_))) <->
    VSet.In a (VSet.add x1 (VSet.add x2 (VSet.add x0 _z_))))


DEBUG:Going to execute:
VSetDecide.MSetDecideAuxiliary.E_eq_to_Logic_eq
DEBUG LTAC Evaluated term: VSet.t
DEBUG LTAC Evaluated term: V.t
Level 1: Backtrace:

Not convertible.
Level 1: Backtrace:

Not convertible.
Level 1: Backtrace:

Not convertible.
Level 0: Backtrace:

No matching clauses for match.