Merge pull request #20515 from tshepang/modernise-ping-pong-benchmark

bench: remove warnings from rt-messaging-ping-pong.rs

Reviewed-by: alexcrichton

src/test/bench/rt-messaging-ping-pong.rs

@@ -20,7 +20,6 @@
 use std::sync::mpsc::channel;
 use std::os;
 use std::thread::Thread;
-use std::uint;
 
 // This is a simple bench that creates M pairs of tasks. These
 // tasks ping-pong back and forth over a pair of streams. This is a
@@ -31,24 +30,24 @@ fn ping_pong_bench(n: uint, m: uint) {
 
     // Create pairs of tasks that pingpong back and forth.
     fn run_pair(n: uint) {
-        // Create a stream A->B
-        let (atx, arx) = channel::<()>();
-        // Create a stream B->A
-        let (btx, brx) = channel::<()>();
+        // Create a channel: A->B
+        let (atx, arx) = channel();
+        // Create a channel: B->A
+        let (btx, brx) = channel();
 
         Thread::spawn(move|| {
             let (tx, rx) = (atx, brx);
             for _ in range(0, n) {
-                tx.send(());
-                rx.recv();
+                tx.send(()).unwrap();
+                rx.recv().unwrap();
             }
         }).detach();
 
         Thread::spawn(move|| {
             let (tx, rx) = (btx, arx);
             for _ in range(0, n) {
-                rx.recv();
-                tx.send(());
+                rx.recv().unwrap();
+                tx.send(()).unwrap();
             }
         }).detach();
     }