use core::ops::{self, Add, AddAssign, Index, IndexMut};
use core::ptr;
use core::str::pattern::Pattern;
-use rustc_unicode::char::{decode_utf16, REPLACEMENT_CHARACTER};
-use rustc_unicode::str as unicode_str;
+use std_unicode::char::{decode_utf16, REPLACEMENT_CHARACTER};
+use std_unicode::str as unicode_str;
use borrow::{Cow, ToOwned};
use range::RangeArgument;