81     step: Cell<u32>,  field
96         Backoff { step: Cell::new(0) }  in new()
111         self.step.set(0);  in reset()
147         for _ in 0..1 << self.step.get().min(SPIN_LIMIT) {  in spin()
154         if self.step.get() <= SPIN_LIMIT {  in spin()
155             self.step.set(self.step.get() + 1);  in spin()
209         if self.step.get() <= SPIN_LIMIT {  in snooze()
210             for _ in 0..1 << self.step.get() {  in snooze()
218             for _ in 0..1 << self.step.get() {  in snooze()
229         if self.step.get() <= YIELD_LIMIT {  in snooze()
230             self.step.set(self.step.get() + 1);  in snooze()
277         self.step.get() > YIELD_LIMIT  in is_completed()
284             .field("step", &self.step)  in fmt()