for x in xs.iter() -> for x in &xs

src/libcore/fmt/mod.rs

@@ -888,7 +888,7 @@ impl<T: Debug> Debug for [T] {
             try!(write!(f, "["));
         }
         let mut is_first = true;
-        for x in self.iter() {
+        for x in self {
             if is_first {
                 is_first = false;
             } else {

src/libcore/hash/mod.rs

@@ -205,7 +205,7 @@ impl<S: Writer + Hasher, T: Hash<S>> Hash<S> for [T] {
     #[inline]
     fn hash(&self, state: &mut S) {
         self.len().hash(state);
-        for elt in self.iter() {
+        for elt in self {
             elt.hash(state);
         }
     }