Unify import style

Author: taiki-e

.rustfmt.toml

@@ -0,0 +1,2 @@
+# https://github.com/rust-lang/async-book/pull/59#issuecomment-556240879
+disable_all_formatting = true

examples/01_02_why_async/src/lib.rs

@@ -1,12 +1,7 @@
 #![cfg(test)]
 
-use {
-    futures::{
-        executor::block_on,
-        join,
-    },
-    std::thread,
-};
+use futures::{executor::block_on, join};
+use std::thread;
 
 fn download(_url: &str) {
     // ...

examples/02_04_executor/src/lib.rs

@@ -1,21 +1,19 @@
 #![cfg(test)]
 
 // ANCHOR: imports
-use {
-    futures::{
-        future::{BoxFuture, FutureExt},
-        task::{waker_ref, ArcWake},
-    },
-    std::{
-        future::Future,
-        sync::mpsc::{sync_channel, Receiver, SyncSender},
-        sync::{Arc, Mutex},
-        task::Context,
-        time::Duration,
-    },
-    // The timer we wrote in the previous section:
-    timer_future::TimerFuture,
+use futures::{
+    future::{BoxFuture, FutureExt},
+    task::{waker_ref, ArcWake},
 };
+use std::{
+    future::Future,
+    sync::mpsc::{sync_channel, Receiver, SyncSender},
+    sync::{Arc, Mutex},
+    task::Context,
+    time::Duration,
+};
+// The timer we wrote in the previous section:
+use timer_future::TimerFuture;
 // ANCHOR_END: imports
 
 // ANCHOR: executor_decl

examples/05_01_streams/src/lib.rs

@@ -1,12 +1,10 @@
 #![cfg(test)]
 
 mod stream_trait {
-use {
-    futures::stream::{Stream as RealStream},
-    std::{
-        pin::Pin,
-        task::{Context, Poll},
-    },
+use futures::stream::Stream as RealStream;
+use std::{
+    pin::Pin,
+    task::{Context, Poll},
 };
 
 // ANCHOR: stream_trait
@@ -34,11 +32,9 @@ impl<I> Stream for dyn RealStream<Item = I> {
 }
 
 mod channels {
-use {
-    futures::{
-        channel::mpsc,
-        prelude::*,
-    },
+use futures::{
+    channel::mpsc,
+    prelude::*,
 };
 
 // ANCHOR: channels

examples/05_02_iteration_and_concurrency/src/lib.rs

@@ -1,14 +1,12 @@
 #![cfg(test)]
 
-use {
-    futures::{
-        executor::block_on,
-        stream::{self, Stream},
-    },
-    std::{
-        io,
-        pin::Pin,
-    },
+use futures::{
+    executor::block_on,
+    stream::{self, Stream},
+};
+use std::{
+    io,
+    pin::Pin,
 };
 
 // ANCHOR: nexts

examples/09_05_final_tcp_server/src/main.rs

@@ -21,7 +21,6 @@ async fn main() {
 // ANCHOR_END: main_func
 
 use async_std::io::{Read, Write};
-use std::marker::Unpin;
 
 async fn handle_connection(mut stream: impl Read + Write + Unpin) {
     let mut buffer = [0; 1024];
@@ -90,7 +89,6 @@ mod tests {
     // ANCHOR_END: mock_write
 
     // ANCHOR: unpin
-    use std::marker::Unpin;
     impl Unpin for MockTcpStream {}
     // ANCHOR_END: unpin
 

src/09_example/03_tests.md

@@ -17,7 +17,6 @@ First, we'll change the signature of `handle_connection` to make it easier to te
 it requires any struct that implements `async_std::io::Read`, `async_std::io::Write`, and `marker::Unpin`.
 Changing the type signature to reflect this allows us to pass a mock for testing.
 ```rust,ignore
-use std::marker::Unpin;
 use async_std::io::{Read, Write};
 
 async fn handle_connection(mut stream: impl Read + Write + Unpin) {