3 files changed, 10 insertions, 10 deletions
diff --git a/src/libcore/iter.rs b/src/libcore/iter.rs
index b12a1c1ed96..54153660c23 100644
--- a/src/libcore/iter.rs
+++ b/src/libcore/iter.rs
@@ -177,7 +177,7 @@ pub trait Iterator {
     /// ```
     /// let a = [0];
     /// let b = [1];
-    /// let mut it = a.iter().chain(b.iter());
+    /// let mut it = a.iter().chain(&b);
     /// assert_eq!(it.next(), Some(&0));
     /// assert_eq!(it.next(), Some(&1));
     /// assert!(it.next().is_none());
@@ -200,7 +200,7 @@ pub trait Iterator {
     /// ```
     /// let a = [0];
     /// let b = [1];
-    /// let mut it = a.iter().zip(b.iter());
+    /// let mut it = a.iter().zip(&b);
     /// assert_eq!(it.next(), Some((&0, &1)));
     /// assert!(it.next().is_none());
     /// ```
@@ -585,9 +585,9 @@ pub trait Iterator {
 
         for x in self {
             if f(&x) {
-                left.extend(Some(x).into_iter())
+                left.extend(Some(x))
             } else {
-                right.extend(Some(x).into_iter())
+                right.extend(Some(x))
             }
         }
 
@@ -994,8 +994,8 @@ pub trait Iterator {
         us.extend(SizeHint(lo, hi, marker::PhantomData));
 
         for (t, u) in self {
-            ts.extend(Some(t).into_iter());
-            us.extend(Some(u).into_iter());
+            ts.extend(Some(t));
+            us.extend(Some(u));
         }
 
         (ts, us)
diff --git a/src/libcore/num/flt2dec/bignum.rs b/src/libcore/num/flt2dec/bignum.rs
index d6a5e44a1fb..4f373c16f7c 100644
--- a/src/libcore/num/flt2dec/bignum.rs
+++ b/src/libcore/num/flt2dec/bignum.rs
@@ -146,7 +146,7 @@ macro_rules! define_bignum {
 
                 let mut sz = cmp::max(self.size, other.size);
                 let mut carry = false;
-                for (a, b) in self.base[..sz].iter_mut().zip(other.base[..sz].iter()) {
+                for (a, b) in self.base[..sz].iter_mut().zip(&other.base[..sz]) {
                     let (c, v) = (*a).full_add(*b, carry);
                     *a = v;
                     carry = c;
@@ -166,7 +166,7 @@ macro_rules! define_bignum {
 
                 let sz = cmp::max(self.size, other.size);
                 let mut noborrow = true;
-                for (a, b) in self.base[..sz].iter_mut().zip(other.base[..sz].iter()) {
+                for (a, b) in self.base[..sz].iter_mut().zip(&other.base[..sz]) {
                     let (c, v) = (*a).full_add(!*b, noborrow);
                     *a = v;
                     noborrow = c;
@@ -183,7 +183,7 @@ macro_rules! define_bignum {
 
                 let mut sz = self.size;
                 let mut carry = 0;
-                for a in self.base[..sz].iter_mut() {
+                for a in &mut self.base[..sz] {
                     let (c, v) = (*a).full_mul(other, carry);
                     *a = v;
                     carry = c;
diff --git a/src/libcore/option.rs b/src/libcore/option.rs
index 872186c09e2..f4b47f3fbb8 100644
--- a/src/libcore/option.rs
+++ b/src/libcore/option.rs
@@ -124,7 +124,7 @@
 //! // but to start with we've just got `None`.
 //! let mut name_of_biggest_animal = None;
 //! let mut size_of_biggest_animal = 0;
-//! for big_thing in all_the_big_things.iter() {
+//! for big_thing in &all_the_big_things {
 //!     match *big_thing {
 //!         Kingdom::Animal(size, name) if size > size_of_biggest_animal => {
 //!             // Now we've found the name of some big animal