Definition fsig_of_funspec (fs: funspec)  :=
match fs with mk_funspec fsig _ _ _ _ _ _=> fsig end.

Lemma part1_splice_into_list:
forall {A} lo hi (al bl: list A),
(0 <= lo <= Zlength bl)%Z ->
sublist 0 lo (splice_into_list lo hi al bl) = sublist 0 lo bl.