Goal:
  
  A : Type
  B : Type
  R : nat → A → B → Type
  n : nat
  l0 : list A
  l : list B
  a : All2i R n l0 l
  ============================
   (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:
CoreTactics.on_last_hyp
            ltac:(fun id => CoreTactics.destruct_sigma id; DepElim.depelim id)
Level 4: evaluation returns
destruct id
where
id := e
of type
constr of type tacvalue

Level 2: evaluation returns
idtac of type tacvalue