Adding upstream version 1.69.0+dfsg1.upstream/1.69.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 14 insertions, 1 deletions

diff --git a/library/core/src/iter/adapters/cloned.rs b/library/core/src/iter/adapters/cloned.rs
index aba24a79d..914ff86c1 100644
--- a/library/core/src/iter/adapters/cloned.rs
+++ b/library/core/src/iter/adapters/cloned.rs
@@ -1,7 +1,7 @@
 use crate::iter::adapters::{
     zip::try_get_unchecked, TrustedRandomAccess, TrustedRandomAccessNoCoerce,
 };
-use crate::iter::{FusedIterator, TrustedLen};
+use crate::iter::{FusedIterator, TrustedLen, UncheckedIterator};
 use crate::ops::Try;
 
 /// An iterator that clones the elements of an underlying iterator.
@@ -140,3 +140,16 @@ where
     T: Clone,
 {
 }
+
+impl<'a, I, T: 'a> UncheckedIterator for Cloned<I>
+where
+    I: UncheckedIterator<Item = &'a T>,
+    T: Clone,
+{
+    unsafe fn next_unchecked(&mut self) -> T {
+        // SAFETY: `Cloned` is 1:1 with the inner iterator, so if the caller promised
+        // that there's an element left, the inner iterator has one too.
+        let item = unsafe { self.it.next_unchecked() };
+        item.clone()
+    }
+}