Goal:
    A : Type  P : nat → A → Type  l : list A
  ============================
   (∀ k : nat,
      Alli P k l
      → Alli (λ k' : nat, P (Nat.pred #|l| - k' + k)) 0 (List.rev l))


DEBUG:Going to execute:
induction l using rev_ind; simpl; intros