---

yaml
---
r: 77814
b: refs/heads/master
c: a3d18bc
h: refs/heads/master
v: v3

Author: lilyball

[refs]

@@ -1,5 +1,5 @@
 ---
-refs/heads/master: fb0b388804ec6b4535e73a890feda7372182486f
+refs/heads/master: a3d18bc95b1639cf3cb967165f7104e2c79893f5
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
 refs/heads/snap-stage3: 60fba4d7d677ec098e6a43014132fe99f7547363
 refs/heads/try: ebfe63cd1c0b5d23f7ea60c69b4fde2e30cfd42a

trunk/src/libstd/iterator.rs

@@ -929,9 +929,12 @@ pub struct Zip<T, U> {
 impl<A, B, T: Iterator<A>, U: Iterator<B>> Iterator<(A, B)> for Zip<T, U> {
     #[inline]
     fn next(&mut self) -> Option<(A, B)> {
-        match (self.a.next(), self.b.next()) {
-            (Some(x), Some(y)) => Some((x, y)),
-            _ => None
+        match self.a.next() {
+            None => None,
+            Some(x) => match self.b.next() {
+                None => None,
+                Some(y) => Some((x, y))
+            }
         }
     }
 
@@ -962,9 +965,12 @@ RandomAccessIterator<(A, B)> for Zip<T, U> {
 
     #[inline]
     fn idx(&self, index: uint) -> Option<(A, B)> {
-        match (self.a.idx(index), self.b.idx(index)) {
-            (Some(x), Some(y)) => Some((x, y)),
-            _ => None
+        match self.a.idx(index) {
+            None => None,
+            Some(x) => match self.b.idx(index) {
+                None => None,
+                Some(y) => Some((x, y))
+            }
         }
     }
 }