Goal:
  
  A : Type
  B : Type
  R : nat → A → B → Type
  n : nat
  H : apply_noConfusion [] []
        (λ _ : True, apply_noConfusion [] [] (λ _ : True, True)) eq_refl
        eq_refl
  ============================
   (All2i_nil = All2i_nil)


DEBUG:Going to execute:
hnf in id
Level 5: evaluation returns
hnf in id; CoreTactics.destruct_tele_eq id || DepElim.depelim id
where
id := H
of type
constr
b := b
of type
constr
a := a
of type
constr
R := eq
of type
constr of type tacvalue