added test for Enumerate::next_index on empty iterator

library/coretests/tests/iter/adapters/enumerate.rs

@@ -120,3 +120,13 @@ fn test_double_ended_enumerate() {
     assert_eq!(it.next_back(), Some((2, 3)));
     assert_eq!(it.next(), None);
 }
+
+#[test]
+fn test_empty_iterator_enumerate_next_index() {
+    let mut it = empty::<i32>().enumerate();
+    assert_eq!(it.next_index(), 0);
+    assert_eq!(it.next_index(), 0);
+    assert_eq!(it.next(), None);
+    assert_eq!(it.next_index(), 0);
+    assert_eq!(it.next_index(), 0);
+}

library/coretests/tests/lib.rs

@@ -63,6 +63,7 @@
 #![feature(maybe_uninit_write_slice)]
 #![feature(min_specialization)]
 #![feature(never_type)]
+#![feature(next_index)]
 #![feature(numfmt)]
 #![feature(pattern)]
 #![feature(pointer_is_aligned_to)]