4 #![allow(unused_imports)]
6 use ::std::fmt::{self, Debug, Display, Write as _};
8 use core::option::Option::*;
11 cmp::{Eq, Ord, PartialEq, PartialOrd},
12 convert::{AsMut, AsRef, From, Into},
14 DoubleEndedIterator, ExactSizeIterator, Extend, FromIterator,
15 IntoIterator, Iterator,
18 Copy as Copy, Send as Send, Sized as Sized, Sync as Sync, Unpin as U,
20 ops::{*, Drop, Fn, FnMut, FnOnce},