Goal:
    A : Type  B : Type  R : nat → A → B → Type  n : nat  b : All2i R n [] []
  ============================
   (∀ e : NoConfusionHom_All2i A B R n [] [] All2i_nil b,
      let H := CoreTactics.block in
      noConfusionHom_All2i_obligation_2 A B R n [] [] All2i_nil b
        (noConfusionHom_All2i_obligation_1 A B R n [] [] All2i_nil b e) = e)


DEBUG:Going to execute:
match goal with
           | |- ?T => change (let _ := CoreTactics.block in T)
           end