Goal:
  
  s : VSet.t
  s'' : VSet.t
  x : V.t
  hin : ~ VSet.In x s
  H : ~ VSet.In x s''
  ============================
   (~ VSet.In x (VSet.union s s''))


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.