Goal:
    A : Type  P : list A → A → Type  e : True
  ============================
   (let H := CoreTactics.block in
    noConfusionHom_All_fold_obligation_2 A P [] (All_fold_nil P)
      (All_fold_nil P)
      (noConfusionHom_All_fold_obligation_1 A P [] 
         (All_fold_nil P) (All_fold_nil P) e) = e)


DEBUG:Going to execute:
CoreTactics.block_goal
Level 8: evaluation returns
idtac of type tacvalue

Level 6: evaluation returns
idtac of type tacvalue

Level 5: evaluation returns
idtac of type tacvalue