Goal:
  
  A : Type
  P : list A → list A → A → A → Type
  a : sigma
        (λ index : sigma (λ _ : list A, list A),
           All2_fold P (pr1 index) (pr2 index))
  b : sigma
        (λ index : sigma (λ _ : list A, list A),
           All2_fold P (pr1 index) (pr2 index))
  H : a = b
  ============================
   (NoConfusion_All2_fold A P a b)


DEBUG:Going to execute:
intros; CoreTactics.on_last_hyp ltac:(fun id => destruct id);
            CoreTactics.on_last_hyp
             ltac:(fun id => CoreTactics.destruct_sigma id; destruct id);
            constructor