Goal:
  
  A : Type
  B : Type
  P : A → nat → B → Type
  a : B
  ls1 : list B
  IH : ∀ (ls2 : list A) (n : nat),
         All (λ x : A, Alli (P x) n ls1) ls2 <~>
         Alli (λ (n0 : nat) (y : B), All (λ x : A, P x n0 y) ls2) n ls1
  a0 : A
  ls2 : list A
  n : nat
  X1 : All (λ x : A, Alli (P x) n (a :: ls1)) ls2
  X3 : All (λ x : A, Alli (P x) n (a :: ls1)) ls2
  X : P a0 n a
  X4 : Alli (P a0) (S n) ls1
  X2 : P a0 n a
  X5 : Alli (P a0) (S n) ls1
  ============================
   (All (λ x : A, P x n a) ls2)


DEBUG:Going to execute:
now eapply All_impl; tea; cbn; inversion 1; subst => //
Level 0: Backtrace:

No 1st non dependent hypothesis in current goal even after head-reduction.
Level 0: Backtrace:

No 1st non dependent hypothesis in current goal even after head-reduction.
Level 1: Backtrace:

No 1st non dependent hypothesis in current goal even after head-reduction.
Level 0: Backtrace:

No 1st non dependent hypothesis in current goal even after head-reduction.
Level 0: Backtrace:

No 1st non dependent hypothesis in current goal even after head-reduction.
Level 0: Backtrace:

No 1st non dependent hypothesis in current goal even after head-reduction.
Level 0: Backtrace:

No 1st non dependent hypothesis in current goal even after head-reduction.
Level 0: Backtrace:

No 1st non dependent hypothesis in current goal even after head-reduction.
Level 0: Backtrace:

No 1st non dependent hypothesis in current goal even after head-reduction.
Level 0: Backtrace:

No 1st non dependent hypothesis in current goal even after head-reduction.
Level 0: Backtrace:

No 1st non dependent hypothesis in current goal even after head-reduction.
Level 0: Backtrace:

No 1st non dependent hypothesis in current goal even after head-reduction.