End FREE.
Local Hint Resolve valid_block_free_1 valid_block_free_2
perm_free_1 perm_free_2 perm_free_3
valid_access_free_1 valid_access_free_inv_1: mem.
(** ** Properties related to [drop_perm] *)

Theorem loadbytes_drop:
forall b' ofs n,
b' <> b \/ ofs + n <= lo \/ hi <= ofs \/ perm_order p Readable ->
loadbytes m' b' ofs n = loadbytes m b' ofs n.