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:
<coq-core.plugins.ltac::intro@0>