remove unused imports

src/libcore/fmt/float.rs

@@ -17,7 +17,7 @@ pub use self::SignFormat::*;
 use char;
 use char::CharExt;
 use fmt;
-use iter::{IteratorExt, range};
+use iter::IteratorExt;
 use num::{cast, Float, ToPrimitive};
 use num::FpCategory as Fp;
 use ops::FnOnce;

src/libcore/fmt/mod.rs

@@ -16,7 +16,7 @@
 use any;
 use cell::{Cell, RefCell, Ref, RefMut};
 use char::CharExt;
-use iter::{Iterator, IteratorExt, range};
+use iter::{Iterator, IteratorExt};
 use marker::{Copy, Sized};
 use mem;
 use option::Option;

src/libcore/str/mod.rs

@@ -23,7 +23,6 @@ use default::Default;
 use error::Error;
 use fmt;
 use iter::ExactSizeIterator;
-use iter::range;
 use iter::{Map, Iterator, IteratorExt, DoubleEndedIterator};
 use marker::Sized;
 use mem;