Rust reference different fields

foo.rs

    fn tick_players(&mut self) {
        for p in self.player_list.iter_mut() {
            let world = self.get_world(p); // boom error taking multiple reference to self. But this is perfectly fine as it doesn't touch player_list..
            p.tick(&self.server_info, world, &mut self.packet_list);
        }
    }

    fn get_world(&mut self, dimension: Dimension) -> &mut World {
        match dimension {
            Dimension::Overworld => &mut self.overworld,
            Dimension::Nether => &mut self.nether,
            Dimension::End => &mut self.end,
        }
    }