28     inner: Arc<Mutex<Inner>>,  field
43             inner: Arc::new(Mutex::new(Inner {  in new()
56             let mut inner = self.inner.lock().unwrap();  in clone()  localVariable
57             inner.cnt += 1;  in clone()
58             if inner.cnt != 0 {  in clone()
59                 if let Some(handle) = inner.handle.take() {  in clone()
67             inner: self.inner.clone(),  in clone()
76         let mut inner = self.inner.lock().unwrap();  in drop()  localVariable
77         inner.cnt -= 1;  in drop()
78         if inner.cnt == 0 {  in drop()
80             inner.handle = Some(count_down(self.tx.clone()));  in drop()