---

yaml
---
r: 232207
b: refs/heads/auto
c: 77f5da7
h: refs/heads/master
i:
  232205: a612ccd
  232203: 45435ed
  232199: 5b07bc4
  232191: 6e95bd3
v: v3

Author: whitequark

[refs]

@@ -8,7 +8,7 @@ refs/tags/release-0.3: b5f0d0f648d9a6153664837026ba1be43d3e2503
 refs/tags/release-0.3.1: 495bae036dfe5ec6ceafd3312b4dca48741e845b
 refs/tags/release-0.4: e828ea2080499553b97dfe33b3f4d472b4562ad7
 refs/tags/release-0.5: 7e3bcfbf21278251ee936ad53e92e9b719702d73
-refs/heads/auto: 6beb4ba1aaecb59fdfdc676434b5a3b17a4b5bfc
+refs/heads/auto: 77f5da77a91af88130fcff3e726931934c71ba3f
 refs/tags/release-0.6: b4ebcfa1812664df5e142f0134a5faea3918544c
 refs/tags/0.1: b19db808c2793fe2976759b85a355c3ad8c8b336
 refs/tags/0.2: 1754d02027f2924bed83b0160ee340c7f41d5ea1

branches/auto/src/libcollections/vec.rs

@@ -1323,6 +1323,8 @@ impl<T> Drop for Vec<T> {
         // don't need unsafe_no_drop_flag shenanigans anymore.
         if self.buf.unsafe_no_drop_flag_needs_drop() {
             unsafe {
+                // The branch on needs_drop() is an -O1 performance optimization.
+                // Without the branch, dropping Vec<u8> takes linear time.
                 if needs_drop::<T>() {
                     for x in self.iter_mut() {
                         drop_in_place(x);