Function debug_duration

src/time/mod.rs:117–123

(what: &str, f: impl Future<Output = Instant>)

    use super::*;

    async fn debug_duration(what: &str, f: impl Future<Output = Instant>) {
        let start = Instant::now();
        let now = f.await;
        let d = now.duration_since(start);
        let d: std::time::Duration = d.into();
        println!("{what} awaited for {} s", d.as_secs_f32());
    }

    #[test]
    fn timer_now() {