Goal:
  
  A : Type
  P : list A → A → Type
  d : A
  Γ : list A
  a : All_fold P Γ
  p : P Γ d
  b : All_fold P Γ
  p0 : P Γ d
  ============================
   (∀ (H := CoreTactics.block) (e : NoConfusionHom_All_fold A P 
                                      (d :: Γ) (All_fold_cons P a p)
                                      (All_fold_cons P b p0)),
      let H0 := CoreTactics.block in
      noConfusionHom_All_fold_obligation_2 A P (d :: Γ) 
        (All_fold_cons P a p) (All_fold_cons P b p0)
        (noConfusionHom_All_fold_obligation_1 A P 
           (d :: Γ) (All_fold_cons P a p) (All_fold_cons P b p0) e) = e)


DEBUG:Going to execute:
change T; CoreTactics.intros_until_block
Level 5: T
 has value 
(∀ e : NoConfusionHom_All_fold A P (d :: Γ) (All_fold_cons P a p)
         (All_fold_cons P b p0),
   let H := CoreTactics.block in
   noConfusionHom_All_fold_obligation_2 A P (d :: Γ) 
     (All_fold_cons P a p) (All_fold_cons P b p0)
     (noConfusionHom_All_fold_obligation_1 A P (d :: Γ) 
        (All_fold_cons P a p) (All_fold_cons P b p0) e) = e)