Goal:
  
  A : Type
  B : Type
  P : nat → A → B → Type
  n : nat
  x : B
  n0 : nat
  x0 : A
  y : B
  l : list A
  r : list B
  r0 : P n0 x0 y
  X : All2i P (S n0) l r
  IHX : ∑ c : A, nth_error l n = Some c × P (S n0 + n)%nat c x
  hnth : nth_error r n = Some x
  ============================
   (∑ c : A, nth_error l n = Some c × P (S (n0 + n)) c x)


DEBUG:Going to execute:
let rec use_hyp H :=
            match type of H with
            | _ ∧ _ => exact H || destruct_hyp H
            | _ * _ => exact H || destruct_hyp H
            | _ => try (solve [ inversion H ])
            end
           with do_intro := let H := fresh in
                            intro H; use_hyp H
           with destruct_hyp H := case H; clear H; do_intro; do_intro
           in
           let rec use_hyps :=
            match goal with
            | H:_ ∧ _ |- _ => exact H || (destruct_hyp H; use_hyps)
            | H:_ * _ |- _ => exact H || (destruct_hyp H; use_hyps)
            | H:_ |- _ => solve [ inversion H ]
            | _ => idtac
            end
           in
           let do_atom := solve
           [ trivial
           with eq_true
           | reflexivity
           | symmetry; trivial
           | contradiction
           | congruence ]
           in
           let rec do_ccl :=
            try do_atom; repeat (do_intro; try do_atom); try arith_congr;
             (solve [ split; do_ccl ])
           in
           (solve [ do_atom | use_hyps; do_ccl ]) ||
             fail "Cannot solve this goal"