Revert "Add implementations of last in terms of next_back on a bunch of DoubleEndedIterators."

This reverts commit 3e86cf36b5114f201868bf459934fe346a76a2d4.

1 files changed, 0 insertions, 14 deletions

diff --git a/src/liballoc/vec.rs b/src/liballoc/vec.rs
index c0cdffe596b..073d3ab5937 100644
--- a/src/liballoc/vec.rs
+++ b/src/liballoc/vec.rs
@@ -2395,11 +2395,6 @@ impl<T> Iterator for IntoIter<T> {
     fn count(self) -> usize {
         self.len()
     }
-
-    #[inline]
-    fn last(mut self) -> Option<T> {
-        self.next_back()
-    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
@@ -2519,11 +2514,6 @@ impl<T> Iterator for Drain<'_, T> {
     fn size_hint(&self) -> (usize, Option<usize>) {
         self.iter.size_hint()
     }
-
-    #[inline]
-    fn last(mut self) -> Option<T> {
-        self.next_back()
-    }
 }
 
 #[stable(feature = "drain", since = "1.6.0")]
@@ -2593,10 +2583,6 @@ impl<I: Iterator> Iterator for Splice<'_, I> {
     fn size_hint(&self) -> (usize, Option<usize>) {
         self.drain.size_hint()
     }
-
-    fn last(mut self) -> Option<Self::Item> {
-        self.next_back()
-    }
 }
 
 #[stable(feature = "vec_splice", since = "1.21.0")]