---

yaml
---
r: 195545
b: refs/heads/master
c: 240734c
h: refs/heads/master
i:
  195543: c079f3d
v: v3

Author: bcoopers

[refs]

@@ -1,5 +1,5 @@
 ---
-refs/heads/master: 8d3e55908ae0e51f04c170133c9f9739886b8e2e
+refs/heads/master: 240734c31e529557583a0dc8e97abf858b4a375d
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
 refs/heads/snap-stage3: b3317d68910900f135f9f38e43a7a699bc736b4a
 refs/heads/try: 961e0358e1a5c0faaef606e31e9965742c1643bf

trunk/src/libstd/io/mod.rs

@@ -101,18 +101,14 @@ fn append_to_string<F>(buf: &mut String, f: F) -> Result<usize>
 fn read_to_end<R: Read + ?Sized>(r: &mut R, buf: &mut Vec<u8>) -> Result<usize> {
     let start_len = buf.len();
     let mut len = start_len;
-    let min_cap_bump = 16;
+    let mut new_write_size = 16;
     let ret;
     loop {
         if len == buf.len() {
-            if buf.capacity() == buf.len() {
-                // reserve() rounds up our request such that every request
-                // (with maybe the exception of the first request) for the
-                // same amount of space doubles our capacity.
-                buf.reserve(min_cap_bump);
+            if new_write_size < DEFAULT_BUF_SIZE {
+                new_write_size *= 2;
             }
-            let new_area = buf.capacity() - buf.len();
-            buf.extend(iter::repeat(0).take(new_area));
+            buf.extend(iter::repeat(0).take(new_write_size));
         }
 
         match r.read(&mut buf[len..]) {