Definition mod_after_alloc (phi: rmap) (lo hi: Z) (b: block) :=
  proj1_sig (make_rmap (mod_after_alloc' phi lo hi b) (ghost_of phi)
    _
    (mod_after_alloc'_ok phi lo hi b) (ghost_of_approx phi)).

Lemma dry_noperm_juicy_nonreadable : forall m loc, access_at (m_dry m) loc Cur = None -> ~readable loc (m_phi m).