(*Hint Rewrite @Zlength_list_repeat'  : sublist.*)
Hint Rewrite @Znth_list_repeat_inrange : sublist.
Hint Rewrite @Zlength_cons @Zlength_nil: sublist.
Hint Rewrite @list_repeat_0: sublist.
Hint Rewrite <- @app_nil_end : sublist.
Hint Rewrite @Zlength_app: sublist.
Hint Rewrite @Zlength_map: sublist.
Hint Rewrite @Zlength_list_repeat using list_solve: sublist.
Hint Rewrite Z.sub_0_r Z.add_0_l Z.add_0_r : sublist.
Hint Rewrite @Zlength_sublist using list_solve: sublist.
Hint Rewrite Z.max_r Z.max_l using omega : sublist.
Hint Rewrite Z.min_r Z.min_l using omega : sublist.
Hint Rewrite Z.add_simpl_r Z.sub_add Z.sub_diag : sublist.
Hint Rewrite @sublist_sublist using list_solve : sublist.
Hint Rewrite @sublist_app1 using list_solve : sublist.
Hint Rewrite @sublist_app2 using list_solve : sublist.
Hint Rewrite @sublist_list_repeat  using list_solve : sublist.
Hint Rewrite @sublist_same using list_solve : sublist.
Hint Rewrite Z.add_simpl_l : sublist.
Hint Rewrite Z.add_add_simpl_l_l Z.add_add_simpl_l_r
Z.add_add_simpl_r_l Z.add_add_simpl_r_r : sublist.
Hint Rewrite Z.add_0_r : sublist.
Hint Rewrite @app_Znth1 using list_solve : sublist.
Hint Rewrite @app_Znth2 using list_solve : sublist.
Hint Rewrite @Znth_sublist using list_solve : sublist.
Hint Rewrite @upd_Znth_Zlength using list_solve : sublist.
Hint Rewrite @sublist_nil : sublist.

Lemma Znth_underflow:
forall {A}{d: Inhabitant A} i (al: list A),  i < 0 -> Znth i al = d.