libcoretest: use tuple indexing

Author: Jorge Aparicio

src/libcoretest/iter.rs

@@ -334,7 +334,7 @@ fn test_iterator_size_hint() {
     assert_eq!(vi.size_hint(), (10, Some(10)));
 
     assert_eq!(c.take(5).size_hint(), (5, Some(5)));
-    assert_eq!(c.skip(5).size_hint().val1(), None);
+    assert_eq!(c.skip(5).size_hint().1, None);
     assert_eq!(c.take_while(|_| false).size_hint(), (0, None));
     assert_eq!(c.skip_while(|_| false).size_hint(), (0, None));
     assert_eq!(c.enumerate().size_hint(), (uint::MAX, None));