Goal:
  
  A : Type
  B : Type
  R : nat → A → B → Type
  n : nat
  e : NoConfusionHom_All2i A B R n [] [] All2i_nil All2i_nil
  ============================
   (let H := 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)


DEBUG:Going to execute:
CoreTactics.intros_until_block