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:
VSetDecide.MSetDecideAuxiliary.abstract_term t
Level 1: Backtrace:

Tactic failure: no need to abstract a variable.
Level 2: Backtrace:

Tactic failure: no need to abstract a variable.
Level 2: Backtrace:

Tactic failure: no need to abstract a variable.
Level 1: Backtrace:

Tactic failure: no need to abstract a variable.
Level 2: Backtrace:

Tactic failure: no need to abstract a variable.
Level 2: Backtrace:

Tactic failure: no need to abstract a variable.
Level 1: Backtrace:

Tactic failure: no need to abstract a variable.