Upgrade to 2021 edition

Author: paolobarbolini

Cargo.toml

@@ -5,7 +5,7 @@ name = "bytes"
 # - Update CHANGELOG.md.
 # - Create "v1.x.y" git tag.
 version = "1.10.1"
-edition = "2018"
+edition = "2021"
 rust-version = "1.57"
 license = "MIT"
 authors = [

src/bytes.rs

@@ -1,4 +1,3 @@
-use core::iter::FromIterator;
 use core::mem::{self, ManuallyDrop};
 use core::ops::{Deref, RangeBounds};
 use core::ptr::NonNull;

src/bytes_mut.rs

@@ -1,4 +1,3 @@
-use core::iter::FromIterator;
 use core::mem::{self, ManuallyDrop, MaybeUninit};
 use core::ops::{Deref, DerefMut};
 use core::ptr::{self, NonNull};

src/lib.rs

@@ -114,7 +114,6 @@ fn abort() -> ! {
 #[inline(always)]
 #[cfg(feature = "std")]
 fn saturating_sub_usize_u64(a: usize, b: u64) -> usize {
-    use core::convert::TryFrom;
     match usize::try_from(b) {
         Ok(b) => a.saturating_sub(b),
         Err(_) => 0,
@@ -124,7 +123,6 @@ fn saturating_sub_usize_u64(a: usize, b: u64) -> usize {
 #[inline(always)]
 #[cfg(feature = "std")]
 fn min_u64_usize(a: u64, b: usize) -> usize {
-    use core::convert::TryFrom;
     match usize::try_from(a) {
         Ok(a) => usize::min(a, b),
         Err(_) => b,

tests/test_bytes.rs

@@ -81,7 +81,6 @@ fn fmt() {
 #[test]
 fn fmt_write() {
     use std::fmt::Write;
-    use std::iter::FromIterator;
     let s = String::from_iter((0..10).map(|_| "abcdefg"));
 
     let mut a = BytesMut::with_capacity(64);