Goal:
    A : Type  P : list A → A → Type  b0 : All_fold P []  b' : list A
  ============================
   (∀ b : All_fold P b',
      {| pr1 := []; pr2 := b0 |} = {| pr1 := b'; pr2 := b |}
      → ∀ (H := CoreTactics.block) (e : NoConfusionHom_All_fold A P []
                                          (All_fold_nil P) b0),
          let H0 := CoreTactics.block in
          noConfusionHom_All_fold_obligation_2 A P [] 
            (All_fold_nil P) b0
            (noConfusionHom_All_fold_obligation_1 A P [] 
               (All_fold_nil P) b0 e) = e)


DEBUG:Going to execute:
intros p