Goal:
  
  A : Type
  B : Type
  R : nat → A → B → Type
  n : nat
  x : A
  y : B
  l : list A
  r : list B
  r0 : R n x y
  a : All2i R (S n) l r
  r2 : R n x y
  b : All2i R (S n) l r
  ============================
   (∀ (H := CoreTactics.block) (e : NoConfusionHom_All2i A B R n 
                                      (x :: l) (y :: r) 
                                      (All2i_cons r0 a) 
                                      (All2i_cons r2 b)),
      let H0 := CoreTactics.block in
      noConfusionHom_All2i_obligation_2 A B R n (x :: l) 
        (y :: r) (All2i_cons r0 a) (All2i_cons r2 b)
        (noConfusionHom_All2i_obligation_1 A B R n 
           (x :: l) (y :: r) (All2i_cons r0 a) (All2i_cons r2 b) e) = e)


DEBUG:Going to execute:
fail 1

Goals:
    A : Type  B : Type  R : nat → A → B → Type  n : nat
  ============================
   (∀ (H := CoreTactics.block) (e : NoConfusionHom_All2i A B R n [] []
                                      All2i_nil All2i_nil),
      let H0 := CoreTactics.block in
      noConfusionHom_All2i_obligation_2 A B R n [] [] All2i_nil All2i_nil
        (noConfusionHom_All2i_obligation_1 A B R n [] [] All2i_nil All2i_nil
           e) = e)

  
  A : Type
  B : Type
  R : nat → A → B → Type
  n : nat
  x : A
  y : B
  l : list A
  r : list B
  r0 : R n x y
  a : All2i R (S n) l r
  r2 : R n x y
  b : All2i R (S n) l r
  ============================
   (∀ (H := CoreTactics.block) (e : NoConfusionHom_All2i A B R n 
                                      (x :: l) (y :: r) 
                                      (All2i_cons r0 a) 
                                      (All2i_cons r2 b)),
      let H0 := CoreTactics.block in
      noConfusionHom_All2i_obligation_2 A B R n (x :: l) 
        (y :: r) (All2i_cons r0 a) (All2i_cons r2 b)
        (noConfusionHom_All2i_obligation_1 A B R n 
           (x :: l) (y :: r) (All2i_cons r0 a) (All2i_cons r2 b) e) = e)


DEBUG:Going to execute:
DepElim.simplify_IH_hyps
Level 4: Backtrace:

Tactic failure (level 1).
Level 3: Backtrace:

Tactic failure.
Level 2: Backtrace:

Tactic failure.

Goals:
    A : Type  B : Type  R : nat → A → B → Type  n : nat
  ============================
   (∀ (H := CoreTactics.block) (e : NoConfusionHom_All2i A B R n [] []
                                      All2i_nil All2i_nil),
      let H0 := CoreTactics.block in
      noConfusionHom_All2i_obligation_2 A B R n [] [] All2i_nil All2i_nil
        (noConfusionHom_All2i_obligation_1 A B R n [] [] All2i_nil All2i_nil
           e) = e)

  
  A : Type
  B : Type
  R : nat → A → B → Type
  n : nat
  x : A
  y : B
  l : list A
  r : list B
  r0 : R n x y
  a : All2i R (S n) l r
  r2 : R n x y
  b : All2i R (S n) l r
  ============================
   (∀ (H := CoreTactics.block) (e : NoConfusionHom_All2i A B R n 
                                      (x :: l) (y :: r) 
                                      (All2i_cons r0 a) 
                                      (All2i_cons r2 b)),
      let H0 := CoreTactics.block in
      noConfusionHom_All2i_obligation_2 A B R n (x :: l) 
        (y :: r) (All2i_cons r0 a) (All2i_cons r2 b)
        (noConfusionHom_All2i_obligation_1 A B R n 
           (x :: l) (y :: r) (All2i_cons r0 a) (All2i_cons r2 b) e) = e)


DEBUG:Going to execute:
repeat
            match goal with
            | hyp:context [ CoreTactics.block ]
              |- _ =>
                  cbn beta in hyp; eqns_specialize_eqs_block hyp;
                   cbn[eq_rect_r eq_rect] in hyp
            end