---

yaml
---
r: 234891
b: refs/heads/stable
c: 18e78b9
h: refs/heads/master
i:
  234889: c08ea86
  234887: 5d1f894
v: v3

Author: sfackler

[refs]

@@ -29,7 +29,7 @@ refs/heads/tmp: afae2ff723393b3ab4ccffef6ac7c6d1809e2da0
 refs/tags/1.0.0-alpha.2: 4c705f6bc559886632d3871b04f58aab093bfa2f
 refs/tags/homu-tmp: f859507de8c410b648d934d8f5ec1c52daac971d
 refs/tags/1.0.0-beta: 8cbb92b53468ee2b0c2d3eeb8567005953d40828
-refs/heads/stable: 23958d803e18de20564c198e1d1ec8d030d617ce
+refs/heads/stable: 18e78b91de236fb216575809840de29298c79ce3
 refs/tags/1.0.0: 55bd4f8ff2b323f317ae89e254ce87162d52a375
 refs/tags/1.1.0: bc3c16f09287e5545c1d3f76b7abd54f2eca868b
 refs/tags/1.2.0: f557861f822c34f07270347b94b5280de20a597e

branches/stable/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);
             }
         }