Instance Inhabitant_share : Inhabitant share := Share.bot.(* TODO: remove this, it's already in sublist.v *) 
Instance Inhabitant_mpred : Inhabitant mpred := @FF mpred Nveric.

Lemma list_join_comm : forall (l1 l2 : list share) a b, sepalg_list.list_join a (l1 ++ l2) b -> sepalg_list.list_join a (l2 ++ l1) b.