Add trailing newline

Author: timvermeulen

src/libcore/benches/iter.rs

@@ -333,4 +333,4 @@ fn bench_filter_chain_ref_count(b: &mut Bencher) {
     b.iter(|| {
         (0i64..1000000).chain(0..1000000).map(black_box).by_ref().filter(|x| x % 3 == 0).count()
     })
-}
+}