Rollup merge of #58034 - faern:stabilize-time-checked-add, r=alexcrichton

Stabilize the time_checked_add feature Closes #55940 Stabilizes `checked_add` and `checked_sub` on `Instant` and `SystemTime`.

Author: Centril

src/libstd/time.rs

@@ -245,17 +245,17 @@ impl Instant {
  /// Returns `Some(t)` where `t` is the time `self + duration` if `t` can be represented as
  /// `Instant` (which means it's inside the bounds of the underlying data structure), `None`
  /// otherwise.
- #[unstable(feature = "time_checked_add", issue = "55940")]
+ #[stable(feature = "time_checked_add", since = "1.34.0")]
  pub fn checked_add(&self, duration: Duration) -> Option<Instant> {
- self.0.checked_add_duration(&duration).map(|t| Instant(t))
+ self.0.checked_add_duration(&duration).map(Instant)
  }
 
  /// Returns `Some(t)` where `t` is the time `self - duration` if `t` can be represented as
  /// `Instant` (which means it's inside the bounds of the underlying data structure), `None`
  /// otherwise.
- #[unstable(feature = "time_checked_add", issue = "55940")]
+ #[stable(feature = "time_checked_add", since = "1.34.0")]
  pub fn checked_sub(&self, duration: Duration) -> Option<Instant> {
- self.0.checked_sub_duration(&duration).map(|t| Instant(t))
+ self.0.checked_sub_duration(&duration).map(Instant)
  }
 }
 
@@ -418,17 +418,17 @@ impl SystemTime {
  /// Returns `Some(t)` where `t` is the time `self + duration` if `t` can be represented as
  /// `SystemTime` (which means it's inside the bounds of the underlying data structure), `None`
  /// otherwise.
- #[unstable(feature = "time_checked_add", issue = "55940")]
+ #[stable(feature = "time_checked_add", since = "1.34.0")]
  pub fn checked_add(&self, duration: Duration) -> Option<SystemTime> {
- self.0.checked_add_duration(&duration).map(|t| SystemTime(t))
+ self.0.checked_add_duration(&duration).map(SystemTime)
  }
 
  /// Returns `Some(t)` where `t` is the time `self - duration` if `t` can be represented as
  /// `SystemTime` (which means it's inside the bounds of the underlying data structure), `None`
  /// otherwise.
- #[unstable(feature = "time_checked_add", issue = "55940")]
+ #[stable(feature = "time_checked_add", since = "1.34.0")]
  pub fn checked_sub(&self, duration: Duration) -> Option<SystemTime> {
- self.0.checked_sub_duration(&duration).map(|t| SystemTime(t))
+ self.0.checked_sub_duration(&duration).map(SystemTime)
  }
 }