---

yaml
---
r: 210298
b: refs/heads/try
c: 31e3cb7
h: refs/heads/master
v: v3

Author: bors

[refs]

@@ -2,7 +2,7 @@
 refs/heads/master: 3e561f05c00cd180ec02db4ccab2840a4aba93d2
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
 refs/heads/snap-stage3: ba0e1cd8147d452c356aacb29fb87568ca26f111
-refs/heads/try: 135502ef0016fd6b17324cc1ed4e088863a97176
+refs/heads/try: 31e3cb7c4e8895fff23aa67e1cd6b58d798cdac4
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/heads/dist-snap: ba4081a5a8573875fed17545846f6f6902c8ba8d
 refs/tags/release-0.2: c870d2dffb391e14efb05aa27898f1f6333a9596

branches/try/src/libcollections/bit.rs

@@ -210,15 +210,13 @@ impl BitVec {
         assert_eq!(self.len(), other.len());
         // This could theoretically be a `debug_assert!`.
         assert_eq!(self.storage.len(), other.storage.len());
-        let mut changed = false;
+        let mut changed_bits = 0;
         for (a, b) in self.blocks_mut().zip(other.blocks()) {
             let w = op(*a, b);
-            if *a != w {
-                changed = true;
-                *a = w;
-            }
+            changed_bits |= *a ^ w;
+            *a = w;
         }
-        changed
+        changed_bits != 0
     }
 
     /// Iterator over mutable refs to  the underlying blocks of data.