1 files changed, 9 insertions, 0 deletions
diff --git a/library/core/src/slice/iter/macros.rs b/library/core/src/slice/iter/macros.rs
index 0fd57b197..89b92a7d5 100644
--- a/library/core/src/slice/iter/macros.rs
+++ b/library/core/src/slice/iter/macros.rs
@@ -384,6 +384,15 @@ macro_rules! iterator {
 
         #[unstable(feature = "trusted_len", issue = "37572")]
         unsafe impl<T> TrustedLen for $name<'_, T> {}
+
+        impl<'a, T> UncheckedIterator for $name<'a, T> {
+            unsafe fn next_unchecked(&mut self) -> $elem {
+                // SAFETY: The caller promised there's at least one more item.
+                unsafe {
+                    next_unchecked!(self)
+                }
+            }
+        }
     }
 }