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
  ============================
   (let H := CoreTactics.block in
    NoConfusionHom_All2i A B R n (x :: l) (y :: r) 
      (All2i_cons r0 a) (All2i_cons r2 b)
    → let H0 := CoreTactics.block in All2i_cons r0 a = All2i_cons r2 b)


DEBUG:Going to execute:
fail 1

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

  
  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
  ============================
   (let H := CoreTactics.block in
    NoConfusionHom_All2i A B R n (x :: l) (y :: r) 
      (All2i_cons r0 a) (All2i_cons r2 b)
    → let H0 := CoreTactics.block in All2i_cons r0 a = All2i_cons r2 b)


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
  ============================
   (let H := CoreTactics.block in
    NoConfusionHom_All2i A B R n [] [] All2i_nil All2i_nil
    → let H0 := CoreTactics.block in All2i_nil = All2i_nil)

  
  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
  ============================
   (let H := CoreTactics.block in
    NoConfusionHom_All2i A B R n (x :: l) (y :: r) 
      (All2i_cons r0 a) (All2i_cons r2 b)
    → let H0 := CoreTactics.block in All2i_cons r0 a = All2i_cons r2 b)


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