fix safety-related comment in slice::rotate

diff --git a/src/libcore/slice/rotate.rs b/src/libcore/slice/rotate.rs
index e4a4e33c1729efb94bd924b552915d048480d6c5..28ef53ccb5cb6b50547b5619bd7d5b7af86049c7 100644 (file)
--- a/src/libcore/slice/rotate.rs
+++ b/src/libcore/slice/rotate.rs
@@ -48,7 +48,6 @@ fn cap() -> usize {
 /// # Safety
 ///
 /// The specified range must be valid for reading and writing.
-/// The type `T` must have non-zero size.
 ///
 /// # Algorithm
 ///
@@ -73,6 +72,7 @@ pub unsafe fn ptr_rotate<T>(mut left: usize, mid: *mut T, mut right: usize) {
     loop {
         let delta = cmp::min(left, right);
         if delta <= RawArray::<T>::cap() {
+            // We will always hit this immediately for ZST.
             break;
         }