(** Effect of [alloc] on access validity. *)

Axiom valid_access_alloc_same:
forall m1 lo hi m2 b, alloc m1 lo hi = (m2, b) ->
forall chunk ofs,
lo <= ofs -> ofs + size_chunk chunk <= hi -> (align_chunk chunk | ofs) ->
valid_access m2 chunk b ofs Freeable.