Update Bytes to Rust 2018 (#274)

tests/test_buf.rs

@@ -1,5 +1,4 @@
-extern crate bytes;
-extern crate byteorder;
+#![deny(warnings, rust_2018_idioms)]
 
 use bytes::Buf;
 use std::io::IoSlice;

tests/test_buf_mut.rs

@@ -1,5 +1,4 @@
-extern crate bytes;
-extern crate byteorder;
+#![deny(warnings, rust_2018_idioms)]
 
 use bytes::{BufMut, BytesMut};
 use std::usize;

tests/test_bytes.rs

@@ -1,4 +1,4 @@
-extern crate bytes;
+#![deny(warnings, rust_2018_idioms)]
 
 use bytes::{Bytes, BytesMut, Buf, BufMut};
 

tests/test_chain.rs

@@ -1,4 +1,4 @@
-extern crate bytes;
+#![deny(warnings, rust_2018_idioms)]
 
 use bytes::{Buf, BufMut, Bytes, BytesMut};
 use bytes::buf::Chain;

tests/test_debug.rs

@@ -1,4 +1,4 @@
-extern crate bytes;
+#![deny(warnings, rust_2018_idioms)]
 
 use bytes::Bytes;
 

tests/test_from_buf.rs

@@ -1,4 +1,4 @@
-extern crate bytes;
+#![deny(warnings, rust_2018_idioms)]
 
 use bytes::{Buf, Bytes, BytesMut};
 

tests/test_iter.rs

@@ -1,6 +1,6 @@
-extern crate bytes;
+#![deny(warnings, rust_2018_idioms)]
 
-use bytes::{Bytes};
+use bytes::Bytes;
 
 #[test]
 fn iter_len() {

tests/test_reader.rs

@@ -1,4 +1,4 @@
-extern crate bytes;
+#![deny(warnings, rust_2018_idioms)]
 
 use std::io::{BufRead, Read};
 

tests/test_serde.rs

@@ -1,7 +1,6 @@
 #![cfg(feature = "serde")]
+#![deny(warnings, rust_2018_idioms)]
 
-extern crate bytes;
-extern crate serde_test;
 use serde_test::{Token, assert_tokens};
 
 #[test]

tests/test_take.rs

@@ -1,4 +1,4 @@
-extern crate bytes;
+#![deny(warnings, rust_2018_idioms)]
 
 use bytes::Buf;