1 fn main() {
2     let a = std::time::Instant::now();
3     let b = std::time::Instant::now();
4     let _ = b.checked_duration_since(a).unwrap();
5 
6     let c = std::time::SystemTime::now();
7     let d = std::time::SystemTime::now();
8     let _ = c.duration_since(std::time::UNIX_EPOCH).unwrap();
9     let _ = d.duration_since(std::time::UNIX_EPOCH).unwrap();
10 }
11