Program Definition mapsto_can_store_definition ch v sh (wsh: writable0_share sh) b ofs jm (v':val)
  (MAPSTO: (address_mapsto ch v sh (b, ofs) * TT)%pred (m_phi jm)):
  Memory.mem.

Lemma po_join_sub_sh sh1 sh2 : join_sub sh2 sh1 -> Mem.perm_order'' (perm_of_sh sh1) (perm_of_sh sh2).