pub struct Flag {
    atomic: Arc<AtomicBool>,
}
impl Flag {
    pub fn new() -> Self {
        Flag {
            atomic: Arc::new(AtomicBool::new(false)),
        }
    }
    pub fn get(&self) -> bool {
        self.atomic.load(SeqCst)
    }
}
#[derive(Debug)]

    has_dropped: Arc<AtomicBool>,

    has_dropped: Flag,

    pub fn new(has_dropped: &Arc<AtomicBool>) -> Self {

    pub fn new(has_dropped: &Flag) -> Self {

            has_dropped: Arc::clone(has_dropped),

            has_dropped: Flag {
                atomic: Arc::clone(&has_dropped.atomic),
            },

        let already_dropped = self.has_dropped.swap(true, SeqCst);

        let already_dropped = self.has_dropped.atomic.swap(true, SeqCst);

use self::drop::DetectDrop;

use self::drop::{DetectDrop, Flag};

use std::sync::atomic::AtomicBool;
use std::sync::atomic::Ordering::SeqCst;
use std::sync::Arc;

    let has_dropped = Arc::new(AtomicBool::new(false));

    let has_dropped = Flag::new();

    assert!(has_dropped.load(SeqCst));

    assert!(has_dropped.get());

use self::drop::DetectDrop;

use self::drop::{DetectDrop, Flag};

use std::sync::atomic::AtomicBool;
use std::sync::atomic::Ordering::SeqCst;
use std::sync::Arc;

    let has_dropped = Arc::new(AtomicBool::new(false));

    let has_dropped = Flag::new();

    assert!(has_dropped.load(SeqCst));

    assert!(has_dropped.get());

use self::drop::DetectDrop;

use self::drop::{DetectDrop, Flag};

use std::sync::atomic::AtomicBool;
use std::sync::atomic::Ordering::SeqCst;
use std::sync::Arc;

    let has_dropped = Arc::new(AtomicBool::new(false));

    let has_dropped = Flag::new();

    assert!(has_dropped.load(SeqCst));

    assert!(has_dropped.get());