self is already by_ref.

Author: Stebalien

src/libcore/iter.rs

@@ -161,7 +161,7 @@ pub trait Iterator {
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     fn nth(&mut self, mut n: usize) -> Option<Self::Item> where Self: Sized {
-        for x in self.by_ref() {
+        for x in self {
             if n == 0 { return Some(x) }
             n -= 1;
         }
@@ -636,7 +636,7 @@ pub trait Iterator {
     fn all<F>(&mut self, mut f: F) -> bool where
         Self: Sized, F: FnMut(Self::Item) -> bool
     {
-        for x in self.by_ref() {
+        for x in self {
             if !f(x) {
                 return false;
             }
@@ -663,7 +663,7 @@ pub trait Iterator {
         Self: Sized,
         F: FnMut(Self::Item) -> bool
     {
-        for x in self.by_ref() {
+        for x in self {
             if f(x) {
                 return true;
             }
@@ -688,7 +688,7 @@ pub trait Iterator {
         Self: Sized,
         P: FnMut(&Self::Item) -> bool,
     {
-        for x in self.by_ref() {
+        for x in self {
             if predicate(&x) { return Some(x) }
         }
         None
@@ -724,7 +724,7 @@ pub trait Iterator {
         P: FnMut(Self::Item) -> bool,
     {
         // `enumerate` might overflow.
-        for (i, x) in self.by_ref().enumerate() {
+        for (i, x) in self.enumerate() {
             if predicate(x) {
                 return Some(i);
             }