You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.rs
    path of file: ./repos/rustrogueliketutorial/chapter-08-ui/src
    
    the code of the file until where you have to start completion: use rltk::{GameState, Rltk, RGB, Point};
use specs::prelude::*;
mod components;
pub use components::*;
mod map;
pub use map::*;
mod player;
use player::*;
mod rect;
pub use rect::Rect;
mod visibility_system;
use visibility_system::VisibilitySystem;
mod monster_ai_system;
use monster_ai_system::MonsterA
    
    fn run_systems(&mut self) {
        let mut vis = VisibilitySystem{};
        vis.run_now(&self.ecs);
        let mut mob = MonsterAI{};
        mob.run_now(&self.ecs);
        let mut mapindex = MapIndexingSystem{};
        mapindex.run_now(&self.ecs);
        let mut melee = MeleeCombatSystem{};
        melee.run_now(&self.ecs);
        let mut damage = DamageSystem{};
        damage.run_now(&self.ecs);
        self.ecs.maintain();
    }