Goal forall mu Etgt Esrc m2 m2' (WD: SM_wd mu) m1
(TgtHyp: forall b ofs, Etgt b ofs = true ->
(Mem.valid_block m2 b /\
(locBlocksTgt mu b = false ->
exists b1 delta1, foreign_of mu b1 = Some(b,delta1) /\
Esrc b1 (ofs-delta1) = true /\ Mem.perm m1 b1 (ofs-delta1) Max Nonempty)))
(Unch2: Mem.unchanged_on (fun b z => Etgt b z = false) m2 m2')
(*(SrcHyp: forall b ofs, Esrc b ofs = true -> vis mu b = true)*)
nu (WDnu: SM_wd nu)
(X1: forall b, locBlocksTgt nu b = true -> locBlocksTgt mu b = false)
(X2: forall b1 b2 d, foreign_of mu b1 = Some(b2, d) ->
locBlocksSrc nu b1 || locBlocksTgt nu b2 = true ->
pub_of nu b1 = Some(b2,d)),
Mem.unchanged_on (fun b2 z => locBlocksTgt nu b2 = true /\
forall b1 d, (as_inj nu) b1 = Some (b2,d) ->
loc_out_of_bounds m1 b1 (z-d)) m2 m2'.

Lemma FreeEffect_validblock: forall m lo hi sp b ofs
(EFF: FreeEffect m lo hi sp b ofs = true),
Mem.valid_block m b.