Implement Iterator::last for vec::IntoIter

2 files changed, 7 insertions, 2 deletions

diff --git a/library/alloc/src/vec/into_iter.rs b/library/alloc/src/vec/into_iter.rs
index 1af110691ba..37df928228d 100644
--- a/library/alloc/src/vec/into_iter.rs
+++ b/library/alloc/src/vec/into_iter.rs
@@ -259,6 +259,11 @@ impl<T, A: Allocator> Iterator for IntoIter<T, A> {
     }
 
     #[inline]
+    fn last(mut self) -> Option<T> {
+        self.next_back()
+    }
+
+    #[inline]
     fn next_chunk<const N: usize>(&mut self) -> Result<[T; N], core::array::IntoIter<T, N>> {
         let mut raw_ary = [const { MaybeUninit::uninit() }; N];
 
diff --git a/library/std/src/sys/args/common.rs b/library/std/src/sys/args/common.rs
index 303b373ccf9..e787105a05a 100644
--- a/library/std/src/sys/args/common.rs
+++ b/library/std/src/sys/args/common.rs
@@ -49,8 +49,8 @@ impl Iterator for Args {
     }
 
     #[inline]
-    fn last(mut self) -> Option<OsString> {
-        self.iter.next_back()
+    fn last(self) -> Option<OsString> {
+        self.iter.last()
     }
 
     #[inline]