1 files changed, 6 insertions, 0 deletions
diff --git a/src/libstd/env.rs b/src/libstd/env.rs
index 01b301cb43d..6cb160067f7 100644
--- a/src/libstd/env.rs
+++ b/src/libstd/env.rs
@@ -740,6 +740,10 @@ impl Iterator for Args {
         self.inner.next().map(|s| s.into_string().unwrap())
     }
     fn size_hint(&self) -> (usize, Option<usize>) { self.inner.size_hint() }
+    #[inline]
+    fn last(mut self) -> Option<String> {
+        self.next_back()
+    }
 }
 
 #[stable(feature = "env", since = "1.0.0")]
@@ -775,6 +779,8 @@ impl Iterator for ArgsOs {
     type Item = OsString;
     fn next(&mut self) -> Option<OsString> { self.inner.next() }
     fn size_hint(&self) -> (usize, Option<usize>) { self.inner.size_hint() }
+    #[inline]
+    fn last(mut self) -> Option<OsString> { self.next_back() }
 }
 
 #[stable(feature = "env", since = "1.0.0")]