Definition bmatch (m: mem) (b: block) (ab: ablock) : Prop :=
  smatch m b ab.(ab_summary) /\
  forall chunk ofs v, Mem.load chunk m b ofs = Some v -> vmatch v (ablock_load chunk ab ofs).

Lemma ablock_storebytes_anywhere_sound: forall m b ofs bytes p m' b' ab, Mem.storebytes m b ofs bytes = Some m' -> (forall b' ofs' q i, In (Fragment (Vptr b' ofs') q i) bytes -> pmatch b' ofs' p) -> bmatch m b' ab -> bmatch m' b' (ablock_storebytes_anywhere ab p).