Goal:
  
  G : t
  z : V.t
  x : V.t
  y : V.t
  z0 : V.t
  p : PathOf G y z0
  e : EdgeOf G z0 z
  i : V.t
  H : x = i \/ VSet.In i (nodes G (PathOf_add_end p e))
  source_vertex0 : VSet.In (s G) (V G)
  ============================
   ((x = i \/ VSet.In i (nodes G p)) \/ i = z0)


DEBUG:Going to execute:
fail 1 "because the goal is beyond the scope of this tactic"
Level 1: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 7: Backtrace:

Failed to progress.
Level 6: Backtrace:

Failed to progress.
Level 5: Backtrace:

Failed to progress.
Level 4: Backtrace:

Failed to progress.
Level 4: Backtrace:

Failed to progress.
Level 4: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 3: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 2: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.
Level 1: Backtrace:

Failed to progress.