Goal:
  
  G : t
  x : V.t
  y : V.t
  z0 : V.t
  p : PathOf G y z0
  i : V.t
  H : VSet.E.eq i x
  source_vertex0 : VSet.In (s G) (V G)
  ============================
   ((x = i \/ VSet.In i (nodes G p)) \/ i = z0)


DEBUG:Going to execute:
<coq-core.plugins.ltac::auto@0> $1 $2 $3

Goals:

DEBUG:Going to execute:
intuition VSetDecide.MSetDecideAuxiliary.fsetdec_rec ||
             fail 1 "because the goal is beyond the scope of this tactic"