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: lazy.rs
    path of file: ./repos/specs/src/world
    
    the code of the file until where you have to start completion: use crossbeam_queue::SegQueue;

use crate::{prelude::*, world::EntitiesRes};
use std::sync::Arc;

struct Queue<T>(SegQueue<T>);

impl<T> Default for Queue<T> {
    fn default() -> Self {
        Self(SegQueue::default())
 
    
        ///     fn run(&mut self, (ent, lazy): Self::SystemData) {
        ///         for entity in ent.join() {
        ///             lazy.exec_mut(move |world| {
        ///                 // complete extermination!
        ///                 world.delete_all();
        ///             });
        ///         }
        ///     }