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auto merge of #18926 : alexcrichton/rust/issue-18925, r=huonw

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The subtraction was erroneously backwards, returning negative durations!

Closes #18925
This commit is contained in:
bors 2014-11-13 23:37:21 +00:00
commit b1c84d6be8
2 changed files with 9 additions and 2 deletions
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2
src/librustc/util/common.rs
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@ -35,7 +35,7 @@ pub fn time<T, U>(do_it: bool, what: &str, u: U, f: |U| -> T) -> T {
let rv = rv.unwrap();
println!("{}time: {}.{:03} \t{}", " ".repeat(old),
dur.num_seconds(), dur.num_milliseconds(), what);
dur.num_seconds(), dur.num_milliseconds() % 1000, what);
depth.replace(Some(old));
rv

9
src/libstd/time/duration.rs
View File

@ -140,7 +140,7 @@ pub fn nanoseconds(nanos: i64) -> Duration {
pub fn span(f: ||) -> Duration {
let before = super::precise_time_ns();
f();
Duration::nanoseconds((before - super::precise_time_ns()) as i64)
Duration::nanoseconds((super::precise_time_ns() - before) as i64)
}
/// Returns the total number of whole weeks in the duration.
@ -565,4 +565,11 @@ fn test_duration_fmt() {
assert_eq!(format!("{:30}", Duration::days(1) + Duration::milliseconds(2345)),
"P1DT2.345S".to_string());
}
#[test]
fn span() {
use io::timer::sleep;
let dur = Duration::span(|| sleep(Duration::milliseconds(5)));
assert!(dur > Duration::milliseconds(1));
}
}