`for x in xs.iter_mut()` -> `for x in &mut xs`

Also `for x in option.iter_mut()` -> `if let Some(ref mut x) = option`

4 files changed, 5 insertions, 5 deletions

diff --git a/src/test/bench/msgsend-ring-mutex-arcs.rs b/src/test/bench/msgsend-ring-mutex-arcs.rs
index c344084a4c0..5d17e3a460c 100644
--- a/src/test/bench/msgsend-ring-mutex-arcs.rs
+++ b/src/test/bench/msgsend-ring-mutex-arcs.rs
@@ -99,7 +99,7 @@ fn main() {
         thread_ring(0, msg_per_task, num_chan, num_port);
 
         // synchronize
-        for f in futures.iter_mut() {
+        for f in &mut futures {
             f.get()
         }
     });
diff --git a/src/test/bench/noise.rs b/src/test/bench/noise.rs
index 664491eed7d..dc5b2f4596e 100644
--- a/src/test/bench/noise.rs
+++ b/src/test/bench/noise.rs
@@ -45,7 +45,7 @@ impl Noise2DContext {
         let mut rng = StdRng::new().unwrap();
 
         let mut rgradients = [Vec2 { x: 0.0, y: 0.0 }; 256];
-        for x in rgradients.iter_mut() {
+        for x in &mut rgradients[] {
             *x = random_gradient(&mut rng);
         }
 
diff --git a/src/test/bench/shootout-meteor.rs b/src/test/bench/shootout-meteor.rs
index 80a21402fe1..d061403d590 100644
--- a/src/test/bench/shootout-meteor.rs
+++ b/src/test/bench/shootout-meteor.rs
@@ -116,9 +116,9 @@ fn transform(piece: Vec<(i32, i32)> , all: bool) -> Vec<Vec<(i32, i32)>> {
         }).collect();
 
     // translating to (0, 0) as minimum coordinates.
-    for cur_piece in res.iter_mut() {
+    for cur_piece in &mut res {
         let (dy, dx) = *cur_piece.iter().min_by(|e| *e).unwrap();
-        for &mut (ref mut y, ref mut x) in cur_piece.iter_mut() {
+        for &mut (ref mut y, ref mut x) in cur_piece {
             *y -= dy; *x -= dx;
         }
     }
diff --git a/src/test/bench/shootout-nbody.rs b/src/test/bench/shootout-nbody.rs
index ca43216c662..a8de1469456 100644
--- a/src/test/bench/shootout-nbody.rs
+++ b/src/test/bench/shootout-nbody.rs
@@ -109,7 +109,7 @@ fn advance(bodies: &mut [Planet;N_BODIES], dt: f64, steps: int) {
                 Some(bi) => bi,
                 None => break
             };
-            for bj in b_slice.iter_mut() {
+            for bj in &mut *b_slice {
                 let dx = bi.x - bj.x;
                 let dy = bi.y - bj.y;
                 let dz = bi.z - bj.z;