Definition same_except_cur (m m' : Mem.mem) :=
Mem.mem_contents m = Mem.mem_contents m' /\
max_access_at m = max_access_at m' /\
Mem.nextblock m = Mem.nextblock m'.

Lemma juicyRestrict_Cur b ofs phi m (coh : access_cohere' m phi):
(Mem.mem_access (juicyRestrict coh)) !! b ofs Cur =
perm_of_res (phi @ (b, ofs)).