unconditionally use Duration::from_nanos_u128

Author: RalfJung

src/clock.rs

@@ -46,21 +46,7 @@ impl Instant {
                 InstantKind::Virtual { nanoseconds: earlier },
             ) => {
                 let duration = nanoseconds.saturating_sub(earlier);
-                cfg_select! {
-                    bootstrap => {
-                         // `Duration` does not provide a nice constructor from a `u128` of nanoseconds,
-                        // so we have to implement this ourselves.
-                        // It is possible for second to overflow because u64::MAX < (u128::MAX / 1e9).
-                        // It will be saturated to u64::MAX seconds if the value after division exceeds u64::MAX.
-                        let seconds = u64::try_from(duration / 1_000_000_000).unwrap_or(u64::MAX);
-                        // It is impossible for nanosecond to overflow because u32::MAX > 1e9.
-                        let nanosecond = u32::try_from(duration.wrapping_rem(1_000_000_000)).unwrap();
-                        Duration::new(seconds, nanosecond)
-                    }
-                    _ => {
-                        Duration::from_nanos_u128(duration)
-                    }
-                }
+                Duration::from_nanos_u128(duration)
             }
             _ => panic!("all `Instant` must be of the same kind"),
         }