Remove all extern crate...

In Rust 2018 edition, it is considered unidiomatic to use "extern crate"
sunthax. The proper way to do it is to replace extern crate with "use"
declarations.

- Also impl clippy suggestions for fn main removal in doctests
- Fix unneeded box allocations and clones

Signed-off-by: Damien Stanton <[email protected]>
Signed-off-by: YUAN LYU <[email protected]>

Author: damienstanton

src/common/headers.rs

@@ -117,7 +117,6 @@ impl Headers {
     /// # Examples
     ///
     /// ```
-    /// extern crate micro_http;
     /// use micro_http::Headers;
     ///
     /// let mut request_header = Headers::default();
@@ -217,7 +216,6 @@ impl Headers {
     /// # Examples
     ///
     /// ```
-    /// extern crate micro_http;
     /// use micro_http::Headers;
     ///
     /// let request_headers = Headers::try_from(b"Content-Length: 55\r\n\r\n");
@@ -275,7 +273,6 @@ impl MediaType {
     /// # Examples
     ///
     /// ```
-    /// extern crate micro_http;
     /// use micro_http::MediaType;
     ///
     /// assert!(MediaType::try_from(b"application/json").is_ok());
@@ -299,7 +296,6 @@ impl MediaType {
     /// # Examples
     ///
     /// ```
-    /// extern crate micro_http;
     /// use micro_http::MediaType;
     ///
     /// let media_type = MediaType::ApplicationJson;

src/common/mod.rs

@@ -131,7 +131,6 @@ impl Display for ServerError {
 ///
 /// ## Examples
 /// ```
-/// extern crate micro_http;
 /// use micro_http::Body;
 /// let body = Body::new("This is a test body.".to_string());
 /// assert_eq!(body.raw(), b"This is a test body.");
@@ -216,7 +215,6 @@ impl Method {
 ///
 /// # Examples
 /// ```
-/// extern crate micro_http;
 /// use micro_http::Version;
 /// let version = Version::try_from(b"HTTP/1.1");
 /// assert!(version.is_ok());

src/lib.rs

@@ -45,7 +45,6 @@
 //!
 //! ## Example for parsing an HTTP Request from a slice
 //! ```
-//! extern crate micro_http;
 //! use micro_http::{Request, Version};
 //!
 //! let http_request = Request::try_from(b"GET http://localhost/home HTTP/1.0\r\n\r\n").unwrap();
@@ -55,7 +54,6 @@
 //!
 //! ## Example for creating an HTTP Response
 //! ```
-//! extern crate micro_http;
 //! use micro_http::{Body, MediaType, Response, StatusCode, Version};
 //!
 //! let mut response = Response::new(Version::Http10, StatusCode::OK);
@@ -82,7 +80,6 @@
 //! ## Example for using the server
 //!
 //! ```
-//! extern crate micro_http;
 //! use micro_http::{HttpServer, Response, StatusCode};
 //!
 //! let path_to_socket = "/tmp/example.sock";
@@ -109,9 +106,6 @@
 //! }
 //! ```
 
-extern crate libc;
-extern crate utils;
-
 mod common;
 mod connection;
 mod request;

src/request.rs

@@ -178,7 +178,6 @@ impl Request {
     /// # Examples
     ///
     /// ```
-    /// extern crate micro_http;
     /// use micro_http::Request;
     ///
     /// let http_request = Request::try_from(b"GET http://localhost/home HTTP/1.0\r\n\r\n").unwrap();

src/server.rs

@@ -397,8 +397,6 @@ impl HttpServer {
     ///
     /// ## Non-blocking server
     /// ```
-    /// extern crate utils;
-    ///
     /// use std::os::unix::io::AsRawFd;
     ///
     /// use micro_http::{HttpServer, Response, StatusCode};

src/vmm/src/vmm_config/mmds.rs

@@ -1,6 +1,8 @@
 // Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0
 
+use serde::{export::Formatter, Deserialize};
+use std::fmt::{Display, Result};
 use std::net::Ipv4Addr;
 
 /// Keeps the MMDS configuration.