Goal:
  
  A : Type
  P : list A → list A → A → A → Type
  d : A
  d' : A
  Γ : list A
  Γ' : list A
  a : All2_fold P Γ Γ'
  p : P Γ Γ' d d'
  ============================
   (∀ (H := CoreTactics.block) (e : NoConfusion_All2_fold A P
                                      {|
                                        pr1 :=
                                          {|
                                            pr1 := d :: Γ; pr2 := d' :: Γ'
                                          |};
                                        pr2 := All2_fold_cons P a p
                                      |}
                                      {|
                                        pr1 := {| pr1 := []; pr2 := [] |};
                                        pr2 := All2_fold_nil P
                                      |}),
      let H0 := CoreTactics.block in
      noConfusion_All2_fold_obligation_2 A P
        {|
          pr1 := {| pr1 := d :: Γ; pr2 := d' :: Γ' |};
          pr2 := All2_fold_cons P a p
        |} {| pr1 := {| pr1 := []; pr2 := [] |}; pr2 := All2_fold_nil P |}
        (noConfusion_All2_fold_obligation_1 A P
           {|
             pr1 := {| pr1 := d :: Γ; pr2 := d' :: Γ' |};
             pr2 := All2_fold_cons P a p
           |} {| pr1 := {| pr1 := []; pr2 := [] |}; pr2 := All2_fold_nil P |}
           e) = e)


DEBUG:Going to execute:
change T; CoreTactics.intros_until_block
Level 5: T
 has value 
(∀ e : NoConfusion_All2_fold A P
         {|
           pr1 := {| pr1 := d :: Γ; pr2 := d' :: Γ' |};
           pr2 := All2_fold_cons P a p
         |} {| pr1 := {| pr1 := []; pr2 := [] |}; pr2 := All2_fold_nil P |},
   let H := CoreTactics.block in
   noConfusion_All2_fold_obligation_2 A P
     {|
       pr1 := {| pr1 := d :: Γ; pr2 := d' :: Γ' |};
       pr2 := All2_fold_cons P a p
     |} {| pr1 := {| pr1 := []; pr2 := [] |}; pr2 := All2_fold_nil P |}
     (noConfusion_All2_fold_obligation_1 A P
        {|
          pr1 := {| pr1 := d :: Γ; pr2 := d' :: Γ' |};
          pr2 := All2_fold_cons P a p
        |} {| pr1 := {| pr1 := []; pr2 := [] |}; pr2 := All2_fold_nil P |} e) =
   e)