fix safety-related comment in slice::rotate

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libcore/slice/rotate.rs b/src/libcore/slice/rotate.rs
index e4a4e33c172..28ef53ccb5c 100644
--- a/src/libcore/slice/rotate.rs
+++ b/src/libcore/slice/rotate.rs
@@ -48,7 +48,6 @@ impl<T> RawArray<T> {
 /// # 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;
         }