use option::Option::{self, Some, None};
use marker::Sized;
-use super::{Chain, Cycle, Cloned, Enumerate, Filter, FilterMap, FlatMap, Fuse, Inspect, Map, Peekable, Scan, Skip, SkipWhile, Take, TakeWhile, Rev, Zip};
+use super::{Chain, Cycle, Cloned, Enumerate, Filter, FilterMap, FlatMap, Fuse,
+ Inspect, Map, Peekable, Scan, Skip, SkipWhile, Take, TakeWhile, Rev,
+ Zip};
use super::ChainState;
-use super::{DoubleEndedIterator, ExactSizeIterator, Extend, FromIterator, IntoIterator};
+use super::{DoubleEndedIterator, ExactSizeIterator, Extend, FromIterator,
+ IntoIterator};
fn _assert_is_object_safe(_: &Iterator<Item=()>) {}