Do not use std::usize module but usize type

src/powerset.rs

@@ -1,7 +1,6 @@
 use alloc::vec::Vec;
 use std::fmt;
 use std::iter::FusedIterator;
-use std::usize;
 
 use super::combinations::{combinations, Combinations};
 use crate::adaptors::checked_binomial;

src/size_hint.rs

@@ -2,7 +2,6 @@
 //!
 
 use std::cmp;
-use std::usize;
 
 /// `SizeHint` is the return type of `Iterator::size_hint()`.
 pub type SizeHint = (usize, Option<usize>);

src/ziptuple.rs

@@ -82,7 +82,7 @@ macro_rules! impl_zip_iter {
 
             fn size_hint(&self) -> (usize, Option<usize>)
             {
-                let sh = (::std::usize::MAX, None);
+                let sh = (usize::MAX, None);
                 let ($(ref $B,)*) = self.t;
                 $(
                     let sh = size_hint::min($B.size_hint(), sh);