Goal:
    x : V.t  s : VSet.t  y : V.t  H0 : x = y -> False  H1 : VSet.In y s
  ============================
   (x = y \/ VSet.In y s /\ x <> y)


DEBUG:Going to execute:
PTRDEBUGTACLtac.right; t_tauto_intuit
Level 2: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
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Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 4: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.