use bevy::prelude::*;

struct Name(String);

fn test(world: &mut World) {
    let mut entity = world.spawn();
    entity.insert(Name("Test".to_string()));
    let name = entity.get::<Name>().unwrap();    
    entity.despawn(); // Or entity.remove::<Name>();
    println!("{}", name.0); // This line should be a compile error
}

fn main() {
    App::build()
        .add_system(test.exclusive_system())
        .run();
}