Goal:
  
  A : Type
  B : Type
  R : nat → A → B → Type
  n : nat
  l0 : list A
  l : list B
  ============================
   (∀ a : All2i R n l0 l,
      let H := CoreTactics.block in
      let H0 := CoreTactics.block in
      noConfusionHom_All2i_obligation_1 A B R n l0 l a a
        (noConfusionHom_All2i_obligation_2 A B R n l0 l a a eq_refl) =
      eq_refl)


DEBUG:Going to execute:
intros p