(* solve list equations *)
(* interpreted functions : Zlength app list_repeat / Zrepeat map sublist upd_Znth -> sublist Znth *)
Definition data_subsume {cs : compspecs} (t : type) (x y : reptype t) : Prop :=
forall sh p, data_at sh t x p |-- data_at sh t y p.
Ltac apply_list_ext :=
first
[ apply data_subsume_array_ext;
only 1, 2 : Zlength_solve
| match goal with |- @eq ?list_A _ _ =>
match eval compute in list_A with list ?A =>
apply (@Znth_eq_ext A ltac:(auto with typeclass_instances))
end
end;
only 1 : Zlength_solve
];
autorewrite with Zlength;
intros.

Lemma rangei_uni_sublist : forall {A : Type} {d : Inhabitant A}
(lo hi lo' hi' : Z) (l : list A) (P : Z -> A -> Prop),
0 <= lo <= hi /\ hi <= hi' - lo' /\ 0 <= lo' <= hi' /\ hi' <= Zlength l ->
rangei_uni lo hi (sublist lo' hi' l) P ->
rangei_uni (lo+lo') (hi+lo') l (fun i => P (i - lo')).