pub fn (self Rooms) pointers() []&Room {
  return self.rooms.map(&it)
}

	// self.matrix.joined_rooms_sync()
	j_rooms := self.matrix.joined_rooms() or { panic('joined_rooms fail') }
	println('sync_rooms: matrix joined_rooms $j_rooms')
	needs_to_join := matrix.rooms_subtract(db_rooms, j_rooms)

	self.matrix.joined_rooms_sync()
	println('sync_rooms: matrix joined_rooms $self.matrix.joined_rooms.rooms')
	needs_to_join := matrix.rooms_subtract(db_rooms, self.matrix.joined_rooms.pointers())

	needs_to_leave := matrix.rooms_subtract(j_rooms, db_rooms)

	needs_to_leave := matrix.rooms_subtract(self.matrix.joined_rooms.pointers(), db_rooms)