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-rw-r--r--src/tutorial.rs131
1 files changed, 44 insertions, 87 deletions
diff --git a/src/tutorial.rs b/src/tutorial.rs
index 9d5e607..7bce7c0 100644
--- a/src/tutorial.rs
+++ b/src/tutorial.rs
@@ -281,8 +281,7 @@ let's get rid of the panic and print an error message manually:
```no_run
//tutorial-error-02.rs
-use std::io;
-use std::process;
+use std::{io, process};
fn main() {
let mut rdr = csv::Reader::from_reader(io::stdin());
@@ -320,9 +319,7 @@ error, which our `main` function can then inspect and decide what to do with.
```no_run
//tutorial-error-03.rs
-use std::error::Error;
-use std::io;
-use std::process;
+use std::{error::Error, io, process};
fn main() {
if let Err(err) = run() {
@@ -360,9 +357,7 @@ special Rust language feature: the question mark.
```no_run
//tutorial-error-04.rs
-use std::error::Error;
-use std::io;
-use std::process;
+use std::{error::Error, io, process};
fn main() {
if let Err(err) = run() {
@@ -416,11 +411,13 @@ path argument instead of stdin.
```no_run
//tutorial-read-01.rs
-use std::env;
-use std::error::Error;
-use std::ffi::OsString;
-use std::fs::File;
-use std::process;
+use std::{
+ env,
+ error::Error,
+ ffi::OsString,
+ fs::File,
+ process,
+};
fn run() -> Result<(), Box<dyn Error>> {
let file_path = get_first_arg()?;
@@ -524,9 +521,7 @@ produces terser examples.)
```no_run
//tutorial-read-headers-01.rs
-# use std::error::Error;
-# use std::io;
-# use std::process;
+# use std::{error::Error, io, process};
#
fn run() -> Result<(), Box<dyn Error>> {
let mut rdr = csv::ReaderBuilder::new()
@@ -565,9 +560,7 @@ method like so:
```no_run
//tutorial-read-headers-02.rs
-# use std::error::Error;
-# use std::io;
-# use std::process;
+# use std::{error::Error, io, process};
#
fn run() -> Result<(), Box<dyn Error>> {
let mut rdr = csv::Reader::from_reader(io::stdin());
@@ -646,9 +639,7 @@ as seen in the following example:
```no_run
//tutorial-read-delimiter-01.rs
-# use std::error::Error;
-# use std::io;
-# use std::process;
+# use std::{error::Error, io, process};
#
fn run() -> Result<(), Box<dyn Error>> {
let mut rdr = csv::ReaderBuilder::new()
@@ -734,9 +725,7 @@ a lot of manual work. This next example shows how.
```no_run
//tutorial-read-serde-01.rs
-# use std::error::Error;
-# use std::io;
-# use std::process;
+# use std::{error::Error, io, process};
#
fn run() -> Result<(), Box<dyn Error>> {
let mut rdr = csv::Reader::from_reader(io::stdin());
@@ -777,9 +766,7 @@ type: `(String, String, Option<u64>, f64, f64)`.
```no_run
//tutorial-read-serde-02.rs
-# use std::error::Error;
-# use std::io;
-# use std::process;
+# use std::{error::Error, io, process};
#
// This introduces a type alias so that we can conveniently reference our
// record type.
@@ -831,9 +818,7 @@ a new `use` statement that imports `HashMap` from the standard library:
```no_run
//tutorial-read-serde-03.rs
use std::collections::HashMap;
-# use std::error::Error;
-# use std::io;
-# use std::process;
+# use std::{error::Error, io, process};
// This introduces a type alias so that we can conveniently reference our
// record type.
@@ -889,9 +874,8 @@ how. Don't miss the new Serde imports!
```no_run
//tutorial-read-serde-04.rs
-use std::error::Error;
-use std::io;
-use std::process;
+# #![allow(dead_code)]
+# use std::{error::Error, io, process};
// This lets us write `#[derive(Deserialize)]`.
use serde::Deserialize;
@@ -1027,9 +1011,8 @@ Let's start by running our program from the previous section:
```no_run
//tutorial-read-serde-invalid-01.rs
-# use std::error::Error;
-# use std::io;
-# use std::process;
+# #![allow(dead_code)]
+# use std::{error::Error, io, process};
#
# use serde::Deserialize;
#
@@ -1096,9 +1079,8 @@ to a `None` value, as shown in this next example:
```no_run
//tutorial-read-serde-invalid-02.rs
-# use std::error::Error;
-# use std::io;
-# use std::process;
+# #![allow(dead_code)]
+# use std::{error::Error, io, process};
#
# use serde::Deserialize;
#[derive(Debug, Deserialize)]
@@ -1164,9 +1146,7 @@ Let's start with the most basic example: writing a few CSV records to `stdout`.
```no_run
//tutorial-write-01.rs
-use std::error::Error;
-use std::io;
-use std::process;
+use std::{error::Error, io, process};
fn run() -> Result<(), Box<dyn Error>> {
let mut wtr = csv::Writer::from_writer(io::stdout());
@@ -1273,10 +1253,12 @@ of `stdout`:
```no_run
//tutorial-write-02.rs
-use std::env;
-use std::error::Error;
-use std::ffi::OsString;
-use std::process;
+use std::{
+ env,
+ error::Error,
+ ffi::OsString,
+ process,
+};
fn run() -> Result<(), Box<dyn Error>> {
let file_path = get_first_arg()?;
@@ -1334,9 +1316,7 @@ Here's an example:
```no_run
//tutorial-write-delimiter-01.rs
-# use std::error::Error;
-# use std::io;
-# use std::process;
+# use std::{error::Error, io, process};
#
fn run() -> Result<(), Box<dyn Error>> {
let mut wtr = csv::WriterBuilder::new()
@@ -1390,9 +1370,7 @@ As with reading, let's start by seeing how we can serialize a Rust tuple.
```no_run
//tutorial-write-serde-01.rs
-# use std::error::Error;
-# use std::io;
-# use std::process;
+# use std::{error::Error, io, process};
#
fn run() -> Result<(), Box<dyn Error>> {
let mut wtr = csv::Writer::from_writer(io::stdout());
@@ -1460,9 +1438,7 @@ shown in the example:
```no_run
//tutorial-write-serde-02.rs
-use std::error::Error;
-use std::io;
-use std::process;
+use std::{error::Error, io, process};
use serde::Serialize;
@@ -1589,10 +1565,7 @@ rows with a field that matches the query.
```no_run
//tutorial-pipeline-search-01.rs
-use std::env;
-use std::error::Error;
-use std::io;
-use std::process;
+use std::{env, error::Error, io, process};
fn run() -> Result<(), Box<dyn Error>> {
// Get the query from the positional arguments.
@@ -1709,10 +1682,7 @@ change:
```no_run
//tutorial-pipeline-search-02.rs
-# use std::env;
-# use std::error::Error;
-# use std::io;
-# use std::process;
+# use std::{env, error::Error, io, process};
#
fn run() -> Result<(), Box<dyn Error>> {
let query = match env::args().nth(1) {
@@ -1781,10 +1751,7 @@ Now here's the code:
```no_run
//tutorial-pipeline-pop-01.rs
-use std::env;
-use std::error::Error;
-use std::io;
-use std::process;
+# use std::{env, error::Error, io, process};
use serde::{Deserialize, Serialize};
@@ -1914,9 +1881,7 @@ adapting a previous example to count the number of records in
```no_run
//tutorial-perf-alloc-01.rs
-use std::error::Error;
-use std::io;
-use std::process;
+use std::{error::Error, io, process};
fn run() -> Result<u64, Box<dyn Error>> {
let mut rdr = csv::Reader::from_reader(io::stdin());
@@ -1972,9 +1937,7 @@ shown in the next example:
```no_run
//tutorial-perf-alloc-02.rs
-# use std::error::Error;
-# use std::io;
-# use std::process;
+# use std::{error::Error, io, process};
#
fn run() -> Result<u64, Box<dyn Error>> {
let mut rdr = csv::Reader::from_reader(io::stdin());
@@ -2055,9 +2018,7 @@ method.
```no_run
//tutorial-perf-alloc-03.rs
-# use std::error::Error;
-# use std::io;
-# use std::process;
+# use std::{error::Error, io, process};
#
fn run() -> Result<u64, Box<dyn Error>> {
let mut rdr = csv::Reader::from_reader(io::stdin());
@@ -2136,9 +2097,8 @@ example using Serde in a previous section:
```no_run
//tutorial-perf-serde-01.rs
-use std::error::Error;
-use std::io;
-use std::process;
+# #![allow(dead_code)]
+use std::{error::Error, io, process};
use serde::Deserialize;
@@ -2205,10 +2165,8 @@ like:
```no_run
//tutorial-perf-serde-02.rs
-# use std::error::Error;
-# use std::io;
-# use std::process;
-#
+# #![allow(dead_code)]
+# use std::{error::Error, io, process};
# use serde::Deserialize;
#
#[derive(Debug, Deserialize)]
@@ -2292,9 +2250,8 @@ of `StringRecord`:
```no_run
//tutorial-perf-serde-03.rs
-# use std::error::Error;
-# use std::io;
-# use std::process;
+# #![allow(dead_code)]
+# use std::{error::Error, io, process};
#
# use serde::Deserialize;
#
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-20 04:45:53 +0000