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
  b : All2i R n (x :: l) (y :: r)
  H : NoConfusionHom_All2i A B R n (x :: l) (y :: r) (All2i_cons r0 a) b
  ============================
   (All2i_cons r0 a = b)


DEBUG:Going to execute:
intro_block_id H
DEBUG LTAC Evaluated term: (let H := CoreTactics.block in
                            NoConfusionHom_All2i A B R n [] [] All2i_nil b
                            → let H0 := CoreTactics.block in All2i_nil = b)