5 pub struct Instant(Duration);  struct
7 impl Ord for Instant {  implementation
13 impl Eq for Instant {}  implementation
15 impl Instant {  implementation
18         Instant(duration_from_f64(now()))  in now()
22     pub fn duration_since(&self, earlier: Instant) -> Duration {  in duration_since()
39     pub fn checked_add(&self, duration: Duration) -> Option<Instant> {  in checked_add()  argument
40         self.0.checked_add(duration).map(Instant)  in checked_add()
47     pub fn checked_sub(&self, duration: Duration) -> Option<Instant> {  in checked_sub()  argument
48         self.0.checked_sub(duration).map(Instant)  in checked_sub()
52 impl Add<Duration> for Instant {  implementation
57         Instant(self.0 + rhs)  in add()
61 impl AddAssign<Duration> for Instant {  implementation
68 impl Sub<Duration> for Instant {  implementation
73         Instant(self.0 - rhs)  in sub()
77 impl Sub<Instant> for Instant {  implementation
81     fn sub(self, rhs: Instant) -> Duration {  in sub()
86 impl SubAssign<Duration> for Instant {  implementation