Goal:
    A : Type  P : nat → A → Type  n : nat  Γ : list A
  ============================
   (Alli P n Γ <~>
    All_fold (λ (Γ : list A) (d : A), P (n + #|Γ|) d) (List.rev Γ))


DEBUG:Going to execute:
fun => <coq-core.plugins.ltac::split@0>