---

yaml
---
r: 227823
b: refs/heads/try
c: 688b623
h: refs/heads/master
i:
  227821: b9ee359
  227819: b398e1b
  227815: 1c0ddf9
  227807: 7c5a9da
v: v3

Author: bors

[refs]

@@ -1,7 +1,7 @@
 ---
 refs/heads/master: aca2057ed5fb7af3f8905b2bc01f72fa001c35c8
 refs/heads/snap-stage3: 1af31d4974e33027a68126fa5a5a3c2c6491824f
-refs/heads/try: 32b7b50bafd0d40fda1caa93cf7f7068cc5052e3
+refs/heads/try: 688b62382c3eeeb0086eb4ada8ad25b08883960e
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/tags/release-0.2: c870d2dffb391e14efb05aa27898f1f6333a9596
 refs/tags/release-0.3: b5f0d0f648d9a6153664837026ba1be43d3e2503

branches/try/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);
             }
         }