43         fn clock() -> Option<Clock> {
44             crate::runtime::context::clock()
49         fn clock() -> Option<Clock> {
89         let clock = clock().expect("time cannot be frozen from outside the Tokio runtime");  localVariable
90         clock.pause();
103         let clock = clock().expect("time cannot be frozen from outside the Tokio runtime");  localVariable
104         let mut inner = clock.inner.lock().unwrap();
126         let clock = clock().expect("time cannot be frozen from outside the Tokio runtime");  localVariable
127         clock.advance(duration);
143         if let Some(clock) = clock() {
144             clock.now()
156             let clock = Clock {  localVariable
165                 clock.pause();
168             clock