Upgrade to Rust 2018 edition idioms

Cargo.toml

@@ -46,7 +46,7 @@ regex = "1.0.1"
 remove_dir_all = "0.5.1"
 same-file = "1.0"
 scopeguard = "0.3"
-serde = "1.0"
+serde = { version = "1.0.87", features = ['derive'] }
 serde_derive = "1.0"
 serde_json = "1.0"
 sha2 = "0.7.0"

src/download/src/errors.rs

@@ -1,3 +1,7 @@
+use error_chain::error_chain;
+use error_chain::error_chain_processing;
+use error_chain::{impl_error_chain_kind, impl_error_chain_processed, impl_extract_backtrace};
+
 error_chain! {
     links { }
 

src/download/src/lib.rs

@@ -1,15 +1,5 @@
 //! Easy file downloading
 
-#[macro_use]
-extern crate error_chain;
-extern crate url;
-
-#[cfg(feature = "reqwest-backend")]
-#[macro_use]
-extern crate lazy_static;
-#[cfg(feature = "reqwest-backend")]
-extern crate reqwest;
-
 use std::path::Path;
 use url::Url;
 
@@ -35,7 +25,7 @@ fn download_with_backend(
     backend: Backend,
     url: &Url,
     resume_from: u64,
-    callback: &Fn(Event) -> Result<()>,
+    callback: &dyn Fn(Event<'_>) -> Result<()>,
 ) -> Result<()> {
     match backend {
         Backend::Curl => curl::download(url, resume_from, callback),
@@ -48,7 +38,7 @@ pub fn download_to_path_with_backend(
     url: &Url,
     path: &Path,
     resume_from_partial: bool,
-    callback: Option<&Fn(Event) -> Result<()>>,
+    callback: Option<&dyn Fn(Event<'_>) -> Result<()>>,
 ) -> Result<()> {
     use std::cell::RefCell;
     use std::fs::OpenOptions;
@@ -133,7 +123,7 @@ pub fn download_to_path_with_backend(
 #[cfg(feature = "curl-backend")]
 pub mod curl {
 
-    extern crate curl;
+    use curl;
 
     use self::curl::easy::Easy;
     use super::Event;
@@ -143,7 +133,11 @@ pub mod curl {
     use std::time::Duration;
     use url::Url;
 
-    pub fn download(url: &Url, resume_from: u64, callback: &Fn(Event) -> Result<()>) -> Result<()> {
+    pub fn download(
+        url: &Url,
+        resume_from: u64,
+        callback: &dyn Fn(Event<'_>) -> Result<()>,
+    ) -> Result<()> {
         // Fetch either a cached libcurl handle (which will preserve open
         // connections) or create a new one if it isn't listed.
         //
@@ -239,7 +233,7 @@ pub mod curl {
                 .response_code()
                 .chain_err(|| "failed to get response code")?;
             match code {
-                0 | 200...299 => {}
+                0 | 200..=299 => {}
                 _ => {
                     return Err(ErrorKind::HttpStatus(code).into());
                 }
@@ -252,16 +246,19 @@ pub mod curl {
 
 #[cfg(feature = "reqwest-backend")]
 pub mod reqwest_be {
-    extern crate env_proxy;
-
     use super::Event;
     use crate::errors::*;
+    use lazy_static::lazy_static;
     use reqwest::{header, Client, Proxy, Response};
     use std::io;
     use std::time::Duration;
     use url::Url;
 
-    pub fn download(url: &Url, resume_from: u64, callback: &Fn(Event) -> Result<()>) -> Result<()> {
+    pub fn download(
+        url: &Url,
+        resume_from: u64,
+        callback: &dyn Fn(Event<'_>) -> Result<()>,
+    ) -> Result<()> {
         // Short-circuit reqwest for the "file:" URL scheme
         if download_from_file_url(url, resume_from, callback)? {
             return Ok(());
@@ -316,7 +313,7 @@ pub mod reqwest_be {
     }
 
     fn env_proxy(url: &Url) -> Option<Url> {
-        env_proxy::for_url(url).to_url()
+        ::env_proxy::for_url(url).to_url()
     }
 
     fn request(url: &Url, resume_from: u64) -> ::reqwest::Result<Response> {
@@ -332,7 +329,7 @@ pub mod reqwest_be {
     fn download_from_file_url(
         url: &Url,
         resume_from: u64,
-        callback: &Fn(Event) -> Result<()>,
+        callback: &dyn Fn(Event<'_>) -> Result<()>,
     ) -> Result<bool> {
         use std::fs;
         use std::io;

src/download/tests/download-curl-resume.rs

@@ -1,8 +1,5 @@
 #![cfg(feature = "curl-backend")]
 
-extern crate download;
-extern crate url;
-
 use std::sync::Mutex;
 
 use url::Url;

src/download/tests/download-reqwest-resume.rs

@@ -1,8 +1,5 @@
 #![cfg(feature = "reqwest-backend")]
 
-extern crate download;
-extern crate url;
-
 use std::sync::Mutex;
 
 use url::Url;

src/download/tests/support/mod.rs

@@ -1,7 +1,3 @@
-extern crate futures;
-extern crate hyper;
-extern crate tempdir;
-
 use std::fs::{self, File};
 use std::io::{self, Read};
 use std::net::SocketAddr;

src/rustup-cli/common.rs

@@ -4,10 +4,9 @@ use crate::errors::*;
 use crate::self_update;
 use crate::term2;
 use rustup::telemetry_analysis::TelemetryAnalysis;
-use rustup::{self, Cfg, Notification, Toolchain, UpdateStatus};
+use rustup::{Cfg, Notification, Toolchain, UpdateStatus};
 use rustup_utils::notify::NotificationLevel;
 use rustup_utils::utils;
-use std;
 use std::io::{BufRead, BufReader, Write};
 use std::path::Path;
 use std::process::{Command, Stdio};
@@ -109,7 +108,7 @@ pub fn set_globals(verbose: bool) -> Result<Cfg> {
 
     let download_tracker = RefCell::new(DownloadTracker::new());
 
-    Ok(Cfg::from_env(Arc::new(move |n: Notification| {
+    Ok(Cfg::from_env(Arc::new(move |n: Notification<'_>| {
         if download_tracker.borrow_mut().handle_notification(&n) {
             return;
         }
@@ -243,7 +242,7 @@ where
     Ok(())
 }
 
-pub fn rustc_version(toolchain: &Toolchain) -> String {
+pub fn rustc_version(toolchain: &Toolchain<'_>) -> String {
     if toolchain.exists() {
         let rustc_path = toolchain.binary_file("rustc");
         if utils::is_file(&rustc_path) {
@@ -294,7 +293,7 @@ pub fn rustc_version(toolchain: &Toolchain) -> String {
     }
 }
 
-pub fn list_targets(toolchain: &Toolchain) -> Result<()> {
+pub fn list_targets(toolchain: &Toolchain<'_>) -> Result<()> {
     let mut t = term2::stdout();
     for component in toolchain.list_components()? {
         if component.component.short_name_in_manifest() == "rust-std" {
@@ -320,7 +319,7 @@ pub fn list_targets(toolchain: &Toolchain) -> Result<()> {
     Ok(())
 }
 
-pub fn list_components(toolchain: &Toolchain) -> Result<()> {
+pub fn list_components(toolchain: &Toolchain<'_>) -> Result<()> {
     let mut t = term2::stdout();
     for component in toolchain.list_components()? {
         let name = component.name;

src/rustup-cli/download_tracker.rs

@@ -4,7 +4,6 @@ use rustup_utils::tty;
 use rustup_utils::Notification as Un;
 use std::collections::VecDeque;
 use std::fmt;
-use term;
 use time::precise_time_s;
 
 /// Keep track of this many past download amounts
@@ -50,7 +49,7 @@ impl DownloadTracker {
         }
     }
 
-    pub fn handle_notification(&mut self, n: &Notification) -> bool {
+    pub fn handle_notification(&mut self, n: &Notification<'_>) -> bool {
         match *n {
             Notification::Install(In::Utils(Un::DownloadContentLengthReceived(content_len))) => {
                 self.content_length_received(content_len);
@@ -170,7 +169,7 @@ impl DownloadTracker {
 struct HumanReadable(f64);
 
 impl fmt::Display for HumanReadable {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         if f.alternate() {
             // repurposing the alternate mode for ETA
             let sec = self.0;

src/rustup-cli/errors.rs

@@ -3,9 +3,7 @@
 use std::io;
 use std::path::PathBuf;
 
-use rustup;
-use rustup_dist::{self, temp};
-use rustup_utils;
+use rustup_dist::temp;
 
 error_chain! {
     links {

src/rustup-cli/job.rs

@@ -34,8 +34,6 @@ mod imp {
 
 #[cfg(windows)]
 mod imp {
-    extern crate winapi;
-
     use std::io;
     use std::mem;
     use std::ptr;

src/rustup-cli/log.rs

@@ -20,7 +20,7 @@ macro_rules! debug {
     ( $ ( $ arg : tt ) * ) => ( $crate::log::debug_fmt ( format_args ! ( $ ( $ arg ) * ) ) )
 }
 
-pub fn warn_fmt(args: fmt::Arguments) {
+pub fn warn_fmt(args: fmt::Arguments<'_>) {
     let mut t = term2::stderr();
     let _ = t.fg(term2::color::BRIGHT_YELLOW);
     let _ = t.attr(term2::Attr::Bold);
@@ -30,7 +30,7 @@ pub fn warn_fmt(args: fmt::Arguments) {
     let _ = write!(t, "\n");
 }
 
-pub fn err_fmt(args: fmt::Arguments) {
+pub fn err_fmt(args: fmt::Arguments<'_>) {
     let mut t = term2::stderr();
     let _ = t.fg(term2::color::BRIGHT_RED);
     let _ = t.attr(term2::Attr::Bold);
@@ -40,7 +40,7 @@ pub fn err_fmt(args: fmt::Arguments) {
     let _ = write!(t, "\n");
 }
 
-pub fn info_fmt(args: fmt::Arguments) {
+pub fn info_fmt(args: fmt::Arguments<'_>) {
     let mut t = term2::stderr();
     let _ = t.attr(term2::Attr::Bold);
     let _ = write!(t, "info: ");
@@ -49,7 +49,7 @@ pub fn info_fmt(args: fmt::Arguments) {
     let _ = write!(t, "\n");
 }
 
-pub fn verbose_fmt(args: fmt::Arguments) {
+pub fn verbose_fmt(args: fmt::Arguments<'_>) {
     let mut t = term2::stderr();
     let _ = t.fg(term2::color::BRIGHT_MAGENTA);
     let _ = t.attr(term2::Attr::Bold);
@@ -59,7 +59,7 @@ pub fn verbose_fmt(args: fmt::Arguments) {
     let _ = write!(t, "\n");
 }
 
-pub fn debug_fmt(args: fmt::Arguments) {
+pub fn debug_fmt(args: fmt::Arguments<'_>) {
     if std::env::var("RUSTUP_DEBUG").is_ok() {
         let mut t = term2::stderr();
         let _ = t.fg(term2::color::BRIGHT_BLUE);

src/rustup-cli/main.rs

@@ -14,34 +14,6 @@
 
 #![recursion_limit = "1024"]
 
-#[macro_use]
-extern crate error_chain;
-extern crate rustup_dist;
-extern crate rustup_utils;
-
-extern crate clap;
-extern crate itertools;
-extern crate markdown;
-extern crate rand;
-extern crate regex;
-extern crate rustup;
-extern crate same_file;
-extern crate scopeguard;
-extern crate sha2;
-extern crate tempdir;
-extern crate term;
-extern crate time;
-extern crate toml;
-extern crate wait_timeout;
-
-#[cfg(windows)]
-extern crate gcc;
-extern crate libc;
-#[cfg(windows)]
-extern crate winapi;
-#[cfg(windows)]
-extern crate winreg;
-
 #[macro_use]
 mod log;
 mod common;