boost::static_pointer_cast<simgrid::kernel::activity::CommImpl>(activity);
xbt_assert(comm->mbox == this, "Comm %p is in mailbox %s, not mailbox %s", comm.get(),
boost::static_pointer_cast<simgrid::kernel::activity::CommImpl>(activity);
xbt_assert(comm->mbox == this, "Comm %p is in mailbox %s, not mailbox %s", comm.get(),