---

yaml
---
r: 218078
b: refs/heads/beta
c: 8d26ded
h: refs/heads/master
v: v3

Author: sfackler

[refs]

@@ -23,7 +23,7 @@ refs/tags/0.9: 36870b185fc5f5486636d4515f0e22677493f225
 refs/tags/0.10: ac33f2b15782272ae348dbd7b14b8257b2148b5a
 refs/tags/0.11.0: e1247cb1d0d681be034adb4b558b5a0c0d5720f9
 refs/tags/0.12.0: f0c419429ef30723ceaf6b42f9b5a2aeb5d2e2d1
-refs/heads/beta: 07a9c5353320c22596241dd0699f209b4567fc2f
+refs/heads/beta: 8d26dedecb16cc97a1d9897ce7afc99de63e7815
 refs/tags/1.0.0-alpha: e42bd6d93a1d3433c486200587f8f9e12590a4d7
 refs/heads/tmp: c83f8f9bd90d0f58c0c34520d4909cde138b9f22
 refs/tags/1.0.0-alpha.2: 4c705f6bc559886632d3871b04f58aab093bfa2f

branches/beta/src/libcollections/vec.rs

@@ -1482,7 +1482,7 @@ impl<T> FromIterator<T> for Vec<T> {
             None => return Vec::new(),
             Some(element) => {
                 let (lower, _) = iterator.size_hint();
-                let mut vector = Vec::with_capacity(1 + lower);
+                let mut vector = Vec::with_capacity(lower.saturating_add(1));
                 unsafe {
                     ptr::write(vector.get_unchecked_mut(0), element);
                     vector.set_len(1);
@@ -1570,10 +1570,11 @@ impl<T> Vec<T> {
             let len = self.len();
             if len == self.capacity() {
                 let (lower, _) = iterator.size_hint();
-                self.reserve(lower + 1);
+                self.reserve(lower.saturating_add(1));
             }
             unsafe {
                 ptr::write(self.get_unchecked_mut(len), element);
+                // NB can't overflow since we would have had to alloc the address space
                 self.set_len(len + 1);
             }
         }