profiler: simplify total_duration

ljedrz · ljedrz · commit 1b549ebbdf30 · 2018-12-17T16:41:44.000+01:00
diff --git a/src/librustc_driver/profile/mod.rs b/src/librustc_driver/profile/mod.rs
@@ -64,9 +64,7 @@ struct StackFrame {
 }
 
 fn total_duration(traces: &[trace::Rec]) -> Duration {
-    let mut sum : Duration = Duration::new(0, 0);
-    for t in traces.iter() { sum += t.dur_total; }
-    return sum
+    Duration::new(0, 0) + traces.iter().map(|t| t.dur_total).sum()
 }
 
 // profiling thread; retains state (in local variables) and dump traces, upon request.

Original file line number	Diff line number	Diff line change
`@@ -64,9 +64,7 @@ struct StackFrame {`
`64`	`64`	`}`
`65`	`65`
`66`	`66`	`fn total_duration(traces: &[trace::Rec]) -> Duration {`
`67`		`- let mut sum : Duration = Duration::new(0, 0);`
`68`		`- for t in traces.iter() { sum += t.dur_total; }`
`69`		`- return sum`
	`67`	`+ Duration::new(0, 0) + traces.iter().map(\|t\| t.dur_total).sum()`
`70`	`68`	`}`
`71`	`69`
`72`	`70`	`// profiling thread; retains state (in local variables) and dump traces, upon request.`