---

yaml
---
r: 196021
b: refs/heads/beta
c: 240734c
h: refs/heads/master
i:
  196019: da7ea5f
v: v3

Author: bcoopers

[refs]

@@ -29,7 +29,7 @@ refs/tags/0.12.0: f0c419429ef30723ceaf6b42f9b5a2aeb5d2e2d1
 refs/heads/automation-fail: 1bf06495443584539b958873e04cc2f864ab10e4
 refs/heads/batch: b7fd822592a4fb577552d93010c4a4e14f314346
 refs/heads/building: 126db549b038c84269a1e4fe46f051b2c15d6970
-refs/heads/beta: 8d3e55908ae0e51f04c170133c9f9739886b8e2e
+refs/heads/beta: 240734c31e529557583a0dc8e97abf858b4a375d
 refs/heads/windistfix: 7608dbad651f02e837ed05eef3d74a6662a6e928
 refs/tags/1.0.0-alpha: e42bd6d93a1d3433c486200587f8f9e12590a4d7
 refs/heads/tmp: 9de34a84bb300bab1bf0227f577331620cd60511

branches/beta/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..]) {