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: commands.rs
    path of file: ./repos/bevy-cheatbook/src/code013/src/programming
    
    the code of the file until where you have to start completion: use bevy::prelude::*;

#[derive(Component)]
struct ComponentA;
#[derive(Component, Default)]
struct C
    
fn my_system(mut commands: Commands) {
    let x = 420;

    commands.add(move |world: &mut World| {
        // do whatever you want with `world` here

        // note: it's a closure, you can use variables from
        // the parent scope/function
        eprintln!("{}", x);
    });
}