[INFO] cloning repository https://github.com/DreamLarva/learn-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/DreamLarva/learn-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDreamLarva%2Flearn-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDreamLarva%2Flearn-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 66b579bd210001a421f7609c30459cc920fd55ae
[INFO] testing DreamLarva/learn-rust against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDreamLarva%2Flearn-rust" "/workspace/builds/worker-53/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-53/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/DreamLarva/learn-rust on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/DreamLarva/learn-rust
[INFO] finished tweaking git repo https://github.com/DreamLarva/learn-rust
[INFO] tweaked toml for git repo https://github.com/DreamLarva/learn-rust written to /workspace/builds/worker-53/source/Cargo.toml
[INFO] crate git repo https://github.com/DreamLarva/learn-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded adder v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1d24328a861b19403f8c91f030a2e5a1f85b4357e4b2f8af80cc7cf0bf510962
[INFO] running `Command { std: "docker" "start" "-a" "1d24328a861b19403f8c91f030a2e5a1f85b4357e4b2f8af80cc7cf0bf510962", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1d24328a861b19403f8c91f030a2e5a1f85b4357e4b2f8af80cc7cf0bf510962", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1d24328a861b19403f8c91f030a2e5a1f85b4357e4b2f8af80cc7cf0bf510962", kill_on_drop: false }`
[INFO] [stdout] 1d24328a861b19403f8c91f030a2e5a1f85b4357e4b2f8af80cc7cf0bf510962
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4f6623d6704f1bdbae07b324101634fc7b377a29efd9e4470fc8189a0ef82464
[INFO] running `Command { std: "docker" "start" "-a" "4f6623d6704f1bdbae07b324101634fc7b377a29efd9e4470fc8189a0ef82464", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.29
[INFO] [stderr]    Compiling libc v0.2.88
[INFO] [stderr]    Compiling getrandom v0.2.2
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling threadPool v0.1.0 (/opt/rustwide/workdir/threadPool)
[INFO] [stderr]    Compiling adder v0.1.0
[INFO] [stdout] warning: crate `threadPool` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `thread_pool`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rand_core v0.6.2
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling rand_chacha v0.3.0
[INFO] [stderr]    Compiling rand v0.8.3
[INFO] [stderr]    Compiling hello_macro_derive v0.1.0 (/opt/rustwide/workdir/derive_macro/hello_macro_derive)
[INFO] [stderr]    Compiling proc_marco v0.1.0 (/opt/rustwide/workdir/proc_marco)
[INFO] [stderr]    Compiling hello_macro v0.1.0 (/opt/rustwide/workdir/derive_macro)
[INFO] [stderr]    Compiling the_rust_programming_language v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `hosting` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:93:9
[INFO] [stdout]     |
[INFO] [stdout] 93  |     use crate::front_of_house::hosting;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 122 | pub use crate::front_of_house::hosting;
[INFO] [stdout]     |         ------------------------------ the item `hosting` is already imported here
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt`
[INFO] [stdout]    --> src/lib.rs:104:5
[INFO] [stdout]     |
[INFO] [stdout] 104 | use std::fmt;
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Result as IoResult`
[INFO] [stdout]    --> src/lib.rs:114:5
[INFO] [stdout]     |
[INFO] [stdout] 114 | use std::io::Result as IoResult;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `borrow`, `cmp::Ordering`
[INFO] [stdout]    --> src/lib.rs:128:11
[INFO] [stdout]     |
[INFO] [stdout] 128 | use std::{borrow, cmp::Ordering};
[INFO] [stdout]     |           ^^^^^^  ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Write`, `self`
[INFO] [stdout]    --> src/lib.rs:132:15
[INFO] [stdout]     |
[INFO] [stdout] 132 | use std::io::{self, Write}; // use io 本身 和 io::Write
[INFO] [stdout]     |               ^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::*`
[INFO] [stdout]    --> src/lib.rs:135:5
[INFO] [stdout]     |
[INFO] [stdout] 135 | use std::collections::*;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::process`
[INFO] [stdout]    --> src/lib.rs:141:5
[INFO] [stdout]     |
[INFO] [stdout] 141 | use std::process;
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order1`
[INFO] [stdout]   --> src/lib.rs:96:13
[INFO] [stdout]    |
[INFO] [stdout] 96 |         let order1 = back_of_house::Appetizer::Soup;
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order2`
[INFO] [stdout]   --> src/lib.rs:97:13
[INFO] [stdout]    |
[INFO] [stdout] 97 |         let order2 = back_of_house::Appetizer::Salad;
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c1`
[INFO] [stdout]    --> src/lib.rs:311:16
[INFO] [stdout]     |
[INFO] [stdout] 311 |     pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor {
[INFO] [stdout]     |                ^^ help: if this is intentional, prefix it with an underscore: `_c1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c2`
[INFO] [stdout]    --> src/lib.rs:311:34
[INFO] [stdout]     |
[INFO] [stdout] 311 |     pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor {
[INFO] [stdout]     |                                  ^^ help: if this is intentional, prefix it with an underscore: `_c2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `serve_order`
[INFO] [stdout]   --> src/lib.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn serve_order() {}
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/lib.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn main() {}
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `eat_at_restaurant`
[INFO] [stdout]   --> src/lib.rs:95:12
[INFO] [stdout]    |
[INFO] [stdout] 95 |     pub fn eat_at_restaurant() {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fix_incorrect_order`
[INFO] [stdout]   --> src/lib.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn fix_incorrect_order() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `cook_order`
[INFO] [stdout]   --> src/lib.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn cook_order() {}
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `seasonal_fruit`
[INFO] [stdout]   --> src/lib.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |         seasonal_fruit: String,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Appetizer`
[INFO] [stdout]   --> src/lib.rs:55:14
[INFO] [stdout]    |
[INFO] [stdout] 55 |     pub enum Appetizer {
[INFO] [stdout]    |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 18 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around method argument
[INFO] [stdout]   --> src/ch02.rs:17:54
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let secret_number = rand::thread_rng().gen_range((1..=100)); // 这个也能运行
[INFO] [stdout]    |                                                      ^       ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 17 -     let secret_number = rand::thread_rng().gen_range((1..=100)); // 这个也能运行
[INFO] [stdout] 17 +     let secret_number = rand::thread_rng().gen_range(1..=100); // 这个也能运行
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]  --> src/ch03.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     /** 基本类型 */
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 7 |     // 直接的赋值能够直接推断出值的类型
[INFO] [stdout] 8 |     let a = 1; // 默认为 i32
[INFO] [stdout]   |     ---------- rustdoc does not generate documentation for statements
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout]   = help: use `/* */` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/ch03.rs:80:5
[INFO] [stdout]    |
[INFO] [stdout] 80 |     /** 复合类型 */
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 83 |     let _tup1: (i32, f64, u8) = (500, 6.4, 1); // 可以设置多种类型
[INFO] [stdout]    |     ------------------------------------------ rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `/* */` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/ch03.rs:154:5
[INFO] [stdout]     |
[INFO] [stdout] 154 |     /// 方法只要在作用域中声明 就能够调用(不用先声明在前)
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 155 |     fun_1();
[INFO] [stdout]     |     ------- rustdoc does not generate documentation for expressions
[INFO] [stdout]     |
[INFO] [stdout]     = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::any::Any`
[INFO] [stdout]  --> src/ch07/mod.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     use std::any::Any;
[INFO] [stdout]   |         ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]    --> src/ch07/mod.rs:118:9
[INFO] [stdout]     |
[INFO] [stdout] 118 |     use std::collections::HashMap; // 引入HashMap 的习惯用法 而不是 use std::collections; 在使用 collections::HashMap
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Result`
[INFO] [stdout]    --> src/ch07/mod.rs:139:13
[INFO] [stdout]     |
[INFO] [stdout] 139 |         use std::fmt::Result;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Result as IoResult`
[INFO] [stdout]    --> src/ch07/mod.rs:140:13
[INFO] [stdout]     |
[INFO] [stdout] 140 |         use std::io::Result as IoResult;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around method argument
[INFO] [stdout]    --> src/ch07/mod.rs:174:58
[INFO] [stdout]     |
[INFO] [stdout] 174 |         let secret_number = rand::thread_rng().gen_range((1..100));
[INFO] [stdout]     |                                                          ^      ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 174 -         let secret_number = rand::thread_rng().gen_range((1..100));
[INFO] [stdout] 174 +         let secret_number = rand::thread_rng().gen_range(1..100);
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around method argument
[INFO] [stdout]    --> src/ch07/mod.rs:175:58
[INFO] [stdout]     |
[INFO] [stdout] 175 |         let secret_number = rand::thread_rng().gen_range((1..=100));
[INFO] [stdout]     |                                                          ^       ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 175 -         let secret_number = rand::thread_rng().gen_range((1..=100));
[INFO] [stdout] 175 +         let secret_number = rand::thread_rng().gen_range(1..=100);
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cmp::Ordering`
[INFO] [stdout]    --> src/ch07/mod.rs:182:13
[INFO] [stdout]     |
[INFO] [stdout] 182 |         use std::cmp::Ordering;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]    --> src/ch07/mod.rs:183:13
[INFO] [stdout]     |
[INFO] [stdout] 183 |         use std::io;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `cmp::Ordering`, `io`
[INFO] [stdout]    --> src/ch07/mod.rs:187:19
[INFO] [stdout]     |
[INFO] [stdout] 187 |         use std::{cmp::Ordering, io};
[INFO] [stdout]     |                   ^^^^^^^^^^^^^  ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]    --> src/ch07/mod.rs:192:13
[INFO] [stdout]     |
[INFO] [stdout] 192 |         use std::io;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Write`
[INFO] [stdout]    --> src/ch07/mod.rs:193:13
[INFO] [stdout]     |
[INFO] [stdout] 193 |         use std::io::Write;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Write`, `self`
[INFO] [stdout]    --> src/ch07/mod.rs:197:23
[INFO] [stdout]     |
[INFO] [stdout] 197 |         use std::io::{self, Write};
[INFO] [stdout]     |                       ^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::*`
[INFO] [stdout]    --> src/ch07/mod.rs:203:13
[INFO] [stdout]     |
[INFO] [stdout] 203 |         use std::collections::*;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `File`, `self`
[INFO] [stdout]  --> src/ch08_hashmap.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::fs::{self, File};
[INFO] [stdout]   |               ^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/ch08_hashmap.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::ErrorKind`
[INFO] [stdout]  --> src/ch08_hashmap.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::io::ErrorKind;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]  --> src/ch08_hashmap.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io::Read;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Add`
[INFO] [stdout]  --> src/ch08_hashmap.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::ops::Add;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `HashMap` is imported redundantly
[INFO] [stdout]   --> src/ch08_hashmap.rs:17:13
[INFO] [stdout]    |
[INFO] [stdout] 3  | use std::collections::*;
[INFO] [stdout]    |     ------------------- the item `HashMap` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 17 |         use std::collections::HashMap;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::*`
[INFO] [stdout]  --> src/ch08_string.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `File`, `self`
[INFO] [stdout]  --> src/ch08_string.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::fs::{self, File};
[INFO] [stdout]   |               ^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/ch08_string.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::ErrorKind`
[INFO] [stdout]  --> src/ch08_string.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::io::ErrorKind;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::*`
[INFO] [stdout]  --> src/ch08_vec.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `File`, `self`
[INFO] [stdout]  --> src/ch08_vec.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::fs::{self, File};
[INFO] [stdout]   |               ^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/ch08_vec.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::ErrorKind`
[INFO] [stdout]  --> src/ch08_vec.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::io::ErrorKind;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]  --> src/ch08_vec.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io::Read;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Add`
[INFO] [stdout]  --> src/ch08_vec.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::ops::Add;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `io` is imported redundantly
[INFO] [stdout]    --> src/ch08_vec.rs:276:23
[INFO] [stdout]     |
[INFO] [stdout] 5   | use std::io;
[INFO] [stdout]     |     ------- the item `io` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 276 |         use std::io::{self, Write};
[INFO] [stdout]     |                       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/ch08_vec.rs:329:5
[INFO] [stdout]     |
[INFO] [stdout] 329 | /     /// ```
[INFO] [stdout] 330 | |     /// pub fn dedup_by_key<F, K>(&mut self, key: F)
[INFO] [stdout] 331 | |     /// where
[INFO] [stdout] 332 | |     ///     F: FnMut(&mut T) -> K,
[INFO] [stdout] 333 | |     ///     K: PartialEq<K>,
[INFO] [stdout] 334 | |     /// ```
[INFO] [stdout] 335 | |     /// 移除vec中 调用F方法后 相同返回值中的多余一个的其他元素
[INFO] [stdout]     | |______________________________________________________________^
[INFO] [stdout] 336 | /     {
[INFO] [stdout] 337 | |         let mut vec = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];
[INFO] [stdout] 338 | |
[INFO] [stdout] 339 | |         vec.dedup_by_key(|i| *i / 10);
[INFO] [stdout] ...   |
[INFO] [stdout] 344 | |         assert_eq!(vec, [1, 10]);
[INFO] [stdout] 345 | |     }
[INFO] [stdout]     | |_____- rustdoc does not generate documentation for expressions
[INFO] [stdout]     |
[INFO] [stdout]     = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/ch09.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::future::Future`
[INFO] [stdout]  --> src/ch09.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::future::Future;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Ref`
[INFO] [stdout]  --> src/ch15_04.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cell::{Ref, RefCell};
[INFO] [stdout]   |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ptr::read_volatile`
[INFO] [stdout]   --> src/ch16.rs:47:5
[INFO] [stdout]    |
[INFO] [stdout] 47 | use std::ptr::read_volatile;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]   --> src/ch16.rs:48:5
[INFO] [stdout]    |
[INFO] [stdout] 48 | use std::rc::Rc;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `mpsc` is imported redundantly
[INFO] [stdout]   --> src/ch16.rs:79:13
[INFO] [stdout]    |
[INFO] [stdout] 49 | use std::sync::{mpsc, Arc};
[INFO] [stdout]    |                 ---- the item `mpsc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 79 |         use std::sync::mpsc;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `thread` is imported redundantly
[INFO] [stdout]   --> src/ch16.rs:80:13
[INFO] [stdout]    |
[INFO] [stdout] 1  | use std::thread;
[INFO] [stdout]    |     ----------- the item `thread` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 80 |         use std::thread;
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Duration` is imported redundantly
[INFO] [stdout]   --> src/ch16.rs:81:13
[INFO] [stdout]    |
[INFO] [stdout] 2  | use std::time::Duration;
[INFO] [stdout]    |     ------------------- the item `Duration` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 81 |         use std::time::Duration;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/ch17.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::panic::RefUnwindSafe`
[INFO] [stdout]  --> src/ch19.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::panic::RefUnwindSafe;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `slice` is imported redundantly
[INFO] [stdout]    --> src/ch19.rs:117:17
[INFO] [stdout]     |
[INFO] [stdout] 92  |         use std::slice;
[INFO] [stdout]     |             ---------- the item `slice` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 117 |             use std::slice;
[INFO] [stdout]     |                 ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Add` is imported redundantly
[INFO] [stdout]    --> src/ch19.rs:310:17
[INFO] [stdout]     |
[INFO] [stdout] 277 |         use std::ops::Add;
[INFO] [stdout]     |             ------------- the item `Add` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 310 |             use std::ops::Add;
[INFO] [stdout]     |                 ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt`
[INFO] [stdout]    --> src/ch19.rs:507:13
[INFO] [stdout]     |
[INFO] [stdout] 507 |         use std::fmt;
[INFO] [stdout]     |             ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Error`
[INFO] [stdout]    --> src/ch19.rs:508:13
[INFO] [stdout]     |
[INFO] [stdout] 508 |         use std::io::Error;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self::proc_macro::TokenStream`
[INFO] [stdout]   --> src/ch19_06.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | use self::proc_macro::TokenStream;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `quote::quote`
[INFO] [stdout]   --> src/ch19_06.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 | use quote::quote;
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `syn`
[INFO] [stdout]   --> src/ch19_06.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 | use syn;
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `hex::hex`
[INFO] [stdout]   --> src/main.rs:58:5
[INFO] [stdout]    |
[INFO] [stdout] 58 | use hex::hex;
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `RefCell`, `Ref`
[INFO] [stdout]   --> src/main.rs:61:17
[INFO] [stdout]    |
[INFO] [stdout] 61 | use std::cell::{Ref, RefCell};
[INFO] [stdout]    |                 ^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Write`
[INFO] [stdout]   --> src/main.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 62 | use std::io::Write;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]   --> src/main.rs:63:5
[INFO] [stdout]    |
[INFO] [stdout] 63 | use std::rc::Rc;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `the_rust_programming_language::Config`
[INFO] [stdout]   --> src/main.rs:64:5
[INFO] [stdout]    |
[INFO] [stdout] 64 | use the_rust_programming_language::Config;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]  --> src/ch08_string.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io::Read;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/ch08_vec.rs:127:13
[INFO] [stdout]     |
[INFO] [stdout] 126 |             Float => (),
[INFO] [stdout]     |             ----- matches any value
[INFO] [stdout] 127 |             Text => (),
[INFO] [stdout]     |             ^^^^ unreachable pattern
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/ch08_vec.rs:128:13
[INFO] [stdout]     |
[INFO] [stdout] 126 |             Float => (),
[INFO] [stdout]     |             ----- matches any value
[INFO] [stdout] 127 |             Text => (),
[INFO] [stdout] 128 |             Int => (),
[INFO] [stdout]     |             ^^^ unreachable pattern
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `a` is never read
[INFO] [stdout]    --> src/ch03.rs:123:5
[INFO] [stdout]     |
[INFO] [stdout] 123 |     a = [1, 2, 3, 4, 5];
[INFO] [stdout]     |     ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/ch06.rs:276:18
[INFO] [stdout]     |
[INFO] [stdout] 276 |             _ => count += 1,
[INFO] [stdout]     |                  ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/ch06.rs:286:13
[INFO] [stdout]     |
[INFO] [stdout] 286 |             count += 1;
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `result` is never read
[INFO] [stdout]    --> src/ch10.rs:688:13
[INFO] [stdout]     |
[INFO] [stdout] 688 |             result = longest(string1.as_str(), string2.as_str());
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/ch04.rs:211:13
[INFO] [stdout]     |
[INFO] [stdout] 211 |         let mut s = String::from("hello");
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/ch04.rs:298:13
[INFO] [stdout]     |
[INFO] [stdout] 298 |         let mut s = String::from("hello world");
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ch08_string.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |         let mut a = String::new(); // 使用类似Vector 的方法 新建一个空的字符串
[INFO] [stdout]    |             ----^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ch08_string.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |         let mut s3 = s1 + &s2 + &s4; // 注意 s1 被移动了，不能继续使用 s2 s3 可以继续使用
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ch08_string.rs:60:13
[INFO] [stdout]    |
[INFO] [stdout] 60 |         let mut t3 = String::from("") + &s2 + &s3;
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/ch10.rs:842:13
[INFO] [stdout]     |
[INFO] [stdout] 842 |         let mut s: &'static str = "I have a static lifetime.";
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]   --> src/ch18.rs:85:9
[INFO] [stdout]    |
[INFO] [stdout] 85 |         fn print_coordinates(&(x, y): &(i32, i32)) {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stdout] ...
[INFO] [stdout] 89 |             print_coordinates(&point);
[INFO] [stdout]    |             ------------------------- recursive call site
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stdout]    = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: private type `ch10_02_traits::Point<T, S>` in public interface (error E0446)
[INFO] [stdout]    --> src/ch10.rs:220:13
[INFO] [stdout]     |
[INFO] [stdout] 220 |             fn summarize1(&self) -> Point<T, S>;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(private_in_public)]` on by default
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: private type `ch10_02_traits::Point<i32, f64>` in public interface (error E0446)
[INFO] [stdout]    --> src/ch10.rs:238:13
[INFO] [stdout]     |
[INFO] [stdout] 238 |             fn summarize1(&self) -> Point<i32, f64> {
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch01.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch02_00_guessing_game_tutorial`
[INFO] [stdout]   --> src/ch02.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn ch02_00_guessing_game_tutorial() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch03_02_data_types`
[INFO] [stdout]  --> src/ch03.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn ch03_02_data_types() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch03_03_how_functions_work`
[INFO] [stdout]    --> src/ch03.rs:135:8
[INFO] [stdout]     |
[INFO] [stdout] 135 | pub fn ch03_03_how_functions_work() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch03_05_control_flow`
[INFO] [stdout]    --> src/ch03.rs:181:8
[INFO] [stdout]     |
[INFO] [stdout] 181 | pub fn ch03_05_control_flow() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fun_2`
[INFO] [stdout]    --> src/ch03.rs:257:4
[INFO] [stdout]     |
[INFO] [stdout] 257 | fn fun_2() {}
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch04_01_what_is_ownership`
[INFO] [stdout]   --> src/ch04.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub fn ch04_01_what_is_ownership() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch04_02_references_and_borrowing`
[INFO] [stdout]    --> src/ch04.rs:139:8
[INFO] [stdout]     |
[INFO] [stdout] 139 | pub fn ch04_02_references_and_borrowing() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch04_03_slices`
[INFO] [stdout]    --> src/ch04.rs:238:8
[INFO] [stdout]     |
[INFO] [stdout] 238 | pub fn ch04_03_slices() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch05_01_defining_structs`
[INFO] [stdout]  --> src/ch05.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn ch05_01_defining_structs() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch05_02_example_structs`
[INFO] [stdout]    --> src/ch05.rs:155:8
[INFO] [stdout]     |
[INFO] [stdout] 155 | pub fn ch05_02_example_structs() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch05_03_method_syntax`
[INFO] [stdout]    --> src/ch05.rs:224:8
[INFO] [stdout]     |
[INFO] [stdout] 224 | pub fn ch05_03_method_syntax() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch06_01_defining_an_enum`
[INFO] [stdout]  --> src/ch06.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn ch06_01_defining_an_enum() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch06_02_match`
[INFO] [stdout]    --> src/ch06.rs:125:8
[INFO] [stdout]     |
[INFO] [stdout] 125 | pub fn ch06_02_match() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alabama`
[INFO] [stdout]    --> src/ch06.rs:228:5
[INFO] [stdout]     |
[INFO] [stdout] 228 |     Alabama,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    --> src/ch06.rs:226:10
[INFO] [stdout]     |
[INFO] [stdout] 226 | #[derive(Debug)]
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alaska`
[INFO] [stdout]    --> src/ch06.rs:229:5
[INFO] [stdout]     |
[INFO] [stdout] 229 |     Alaska,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    --> src/ch06.rs:226:10
[INFO] [stdout]     |
[INFO] [stdout] 226 | #[derive(Debug)]
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `A1`
[INFO] [stdout]    --> src/ch06.rs:230:5
[INFO] [stdout]     |
[INFO] [stdout] 230 |     A1(B1), // --snip--
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    --> src/ch06.rs:226:10
[INFO] [stdout]     |
[INFO] [stdout] 226 | #[derive(Debug)]
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `B2`
[INFO] [stdout]    --> src/ch06.rs:235:5
[INFO] [stdout]     |
[INFO] [stdout] 235 |     B2,
[INFO] [stdout]     |     ^^
[INFO] [stdout]     |
[INFO] [stdout] note: `B1` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    --> src/ch06.rs:233:10
[INFO] [stdout]     |
[INFO] [stdout] 233 | #[derive(Debug)]
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `B3`
[INFO] [stdout]    --> src/ch06.rs:236:5
[INFO] [stdout]     |
[INFO] [stdout] 236 |     B3,
[INFO] [stdout]     |     ^^
[INFO] [stdout]     |
[INFO] [stdout] note: `B1` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    --> src/ch06.rs:233:10
[INFO] [stdout]     |
[INFO] [stdout] 233 | #[derive(Debug)]
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Coin`
[INFO] [stdout]    --> src/ch06.rs:240:6
[INFO] [stdout]     |
[INFO] [stdout] 240 | enum Coin {
[INFO] [stdout]     |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch06_03_if_let`
[INFO] [stdout]    --> src/ch06.rs:248:8
[INFO] [stdout]     |
[INFO] [stdout] 248 | pub fn ch06_03_if_let() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch06_03_matches`
[INFO] [stdout]    --> src/ch06.rs:292:8
[INFO] [stdout]     |
[INFO] [stdout] 292 | pub fn ch06_03_matches() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/ch07/mod.rs:79:8
[INFO] [stdout]    |
[INFO] [stdout] 79 | pub fn main() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch08_03_hash_maps`
[INFO] [stdout]   --> src/ch08_hashmap.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn ch08_03_hash_maps() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch08_02_strings`
[INFO] [stdout]   --> src/ch08_string.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn ch08_02_strings() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch08_01_vectors`
[INFO] [stdout]   --> src/ch08_vec.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn ch08_01_vectors() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch09_01_unrecoverable_errors_with_panic`
[INFO] [stdout]   --> src/ch09.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn ch09_01_unrecoverable_errors_with_panic() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch09_02_recoverable_errors_with_result`
[INFO] [stdout]   --> src/ch09.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub fn ch09_02_recoverable_errors_with_result() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch09_03_to_panic_or_not_to_panic`
[INFO] [stdout]    --> src/ch09.rs:177:8
[INFO] [stdout]     |
[INFO] [stdout] 177 | pub fn ch09_03_to_panic_or_not_to_panic() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch10_00_generics`
[INFO] [stdout]  --> src/ch10.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn ch10_00_generics() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch10_01_syntax`
[INFO] [stdout]   --> src/ch10.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub fn ch10_01_syntax() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch10_02_traits`
[INFO] [stdout]    --> src/ch10.rs:159:8
[INFO] [stdout]     |
[INFO] [stdout] 159 | pub fn ch10_02_traits() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch10_03_lifetime_syntax`
[INFO] [stdout]    --> src/ch10.rs:626:8
[INFO] [stdout]     |
[INFO] [stdout] 626 | pub fn ch10_03_lifetime_syntax() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `length`
[INFO] [stdout]  --> src/ch11_01.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     length: u32,
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]  --> src/ch11_01.rs:3:10
[INFO] [stdout]   |
[INFO] [stdout] 3 | #[derive(Debug)]
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout]   = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]  --> src/ch11_01.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     width: u32,
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]  --> src/ch11_01.rs:3:10
[INFO] [stdout]   |
[INFO] [stdout] 3 | #[derive(Debug)]
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout]   = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/ch11_01.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 |     pub fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_two`
[INFO] [stdout]   --> src/ch11_01.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 | pub fn add_two(a: i32) -> i32 {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `greeting`
[INFO] [stdout]    --> src/ch11_01.rs:112:8
[INFO] [stdout]     |
[INFO] [stdout] 112 | pub fn greeting(name: &str) -> String {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Guess`
[INFO] [stdout]    --> src/ch11_01.rs:132:12
[INFO] [stdout]     |
[INFO] [stdout] 132 | pub struct Guess {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/ch11_01.rs:137:12
[INFO] [stdout]     |
[INFO] [stdout] 137 |     pub fn new(value: i32) -> Guess {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `prints_and_returns_10`
[INFO] [stdout]   --> src/ch11_02.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn prints_and_returns_10(a: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_two`
[INFO] [stdout]   --> src/ch11_02.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | pub fn add_two(a: i32) -> i32 {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_two`
[INFO] [stdout]   --> src/ch11_03.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn add_two(a: i32) -> i32 {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `internal_adder`
[INFO] [stdout]   --> src/ch11_03.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn internal_adder(a: i32, b: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Config`
[INFO] [stdout]   --> src/ch12.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Config<'a> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/ch12.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn new(args: &[String]) -> Result<Config, &'static str> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `minigrep`
[INFO] [stdout]   --> src/ch12.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | pub fn minigrep() {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]   --> src/ch12.rs:61:4
[INFO] [stdout]    |
[INFO] [stdout] 61 | fn run(config: Config) -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `search`
[INFO] [stdout]   --> src/ch12.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch13_01_closures`
[INFO] [stdout]  --> src/ch13.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn ch13_01_closures() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch13_02_iterators`
[INFO] [stdout]    --> src/ch13.rs:224:8
[INFO] [stdout]     |
[INFO] [stdout] 224 | pub fn ch13_02_iterators() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch13_04_performance`
[INFO] [stdout]    --> src/ch13.rs:392:8
[INFO] [stdout]     |
[INFO] [stdout] 392 | pub fn ch13_04_performance(buffer: &mut [i32], coefficients: [i64; 12], qlp_shift: i16) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch14_01_release_profiles`
[INFO] [stdout]   --> src/ch14.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn ch14_01_release_profiles() {}
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch14_02_publishing_to_crates_io`
[INFO] [stdout]   --> src/ch14.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn ch14_02_publishing_to_crates_io() {}
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch15_01_box`
[INFO] [stdout]   --> src/ch15.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn ch15_01_box() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch15_02_deref`
[INFO] [stdout]   --> src/ch15.rs:89:8
[INFO] [stdout]    |
[INFO] [stdout] 89 | pub fn ch15_02_deref() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch15_03_drop`
[INFO] [stdout]    --> src/ch15.rs:182:8
[INFO] [stdout]     |
[INFO] [stdout] 182 | pub fn ch15_03_drop() {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `List`
[INFO] [stdout]    --> src/ch15.rs:247:6
[INFO] [stdout]     |
[INFO] [stdout] 247 | enum List {
[INFO] [stdout]     |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch15_04_rc`
[INFO] [stdout]    --> src/ch15.rs:252:8
[INFO] [stdout]     |
[INFO] [stdout] 252 | pub fn ch15_04_rc() {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `LimitTracker`
[INFO] [stdout]    --> src/ch15.rs:347:12
[INFO] [stdout]     |
[INFO] [stdout] 347 | pub struct LimitTracker<'a, T: Messenger> {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/ch15.rs:357:12
[INFO] [stdout]     |
[INFO] [stdout] 357 |     pub fn new(messenger: &T, max: usize) -> LimitTracker<T> {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `set_value`
[INFO] [stdout]    --> src/ch15.rs:365:12
[INFO] [stdout]     |
[INFO] [stdout] 365 |     pub fn set_value(&mut self, value: usize) {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cons`
[INFO] [stdout]   --> src/ch15_02.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_02.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nil`
[INFO] [stdout]   --> src/ch15_02.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     Nil,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_02.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/ch15_02.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn main() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cons`
[INFO] [stdout]   --> src/ch15_03.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_03.rs:11:10
[INFO] [stdout]    |
[INFO] [stdout] 11 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nil`
[INFO] [stdout]   --> src/ch15_03.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     Nil,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_03.rs:11:10
[INFO] [stdout]    |
[INFO] [stdout] 11 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]   --> src/ch15_03.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/ch15_03.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub fn main() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]   --> src/ch15_04.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     value: i32,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_04.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `parent`
[INFO] [stdout]   --> src/ch15_04.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     parent: RefCell<Weak<Node>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_04.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `children`
[INFO] [stdout]   --> src/ch15_04.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_04.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/ch15_04.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn main() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch16_01_threads`
[INFO] [stdout]   --> src/ch16.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn ch16_01_threads() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch16_02_message_passing`
[INFO] [stdout]   --> src/ch16.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | pub fn ch16_02_message_passing() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch16_03_shared_state`
[INFO] [stdout]    --> src/ch16.rs:140:8
[INFO] [stdout]     |
[INFO] [stdout] 140 | pub fn ch16_03_shared_state() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch16_04_extensible_concurrency_sync_and_send`
[INFO] [stdout]    --> src/ch16.rs:218:8
[INFO] [stdout]     |
[INFO] [stdout] 218 | pub fn ch16_04_extensible_concurrency_sync_and_send() {}
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch17_01whatis_oo`
[INFO] [stdout]  --> src/ch17.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn ch17_01whatis_oo() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch17_02_trait_objects`
[INFO] [stdout]   --> src/ch17.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub fn ch17_02_trait_objects() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch17_03_oo_design_patterns`
[INFO] [stdout]    --> src/ch17.rs:226:8
[INFO] [stdout]     |
[INFO] [stdout] 226 | pub fn ch17_03_oo_design_patterns() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch18_01_all_the_places_for_patterns`
[INFO] [stdout]  --> src/ch18.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn ch18_01_all_the_places_for_patterns() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch18_02_refutability`
[INFO] [stdout]   --> src/ch18.rs:95:8
[INFO] [stdout]    |
[INFO] [stdout] 95 | pub fn ch18_02_refutability() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch18_03_pattern_syntax`
[INFO] [stdout]    --> src/ch18.rs:104:8
[INFO] [stdout]     |
[INFO] [stdout] 104 | pub fn ch18_03_pattern_syntax() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch19_01_unsafe_rust`
[INFO] [stdout]  --> src/ch19.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn ch19_01_unsafe_rust() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch19_03_advanced_traits`
[INFO] [stdout]    --> src/ch19.rs:213:8
[INFO] [stdout]     |
[INFO] [stdout] 213 | pub fn ch19_03_advanced_traits() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch19_04_advanced_types`
[INFO] [stdout]    --> src/ch19.rs:475:8
[INFO] [stdout]     |
[INFO] [stdout] 475 | pub fn ch19_04_advanced_types() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch19_05_advanced_functions_and_closures`
[INFO] [stdout]    --> src/ch19.rs:661:8
[INFO] [stdout]     |
[INFO] [stdout] 661 | pub fn ch19_05_advanced_functions_and_closures() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/ch19_06.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch20.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `handle_connection`
[INFO] [stdout]   --> src/ch20.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn handle_connection(mut stream: TcpStream) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `breathe_in`
[INFO] [stdout]   --> src/ch07/mod.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn breathe_in() {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Vegetable`
[INFO] [stdout]   --> src/ch07/mod.rs:26:16
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub struct Vegetable {
[INFO] [stdout]    |                ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/ch07/mod.rs:32:16
[INFO] [stdout]    |
[INFO] [stdout] 32 |         pub fn new(name: &str) -> Vegetable {
[INFO] [stdout]    |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `generate_struct`
[INFO] [stdout]   --> src/ch07/mod.rs:40:12
[INFO] [stdout]    |
[INFO] [stdout] 40 |     pub fn generate_struct() -> Vegetable {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Appetizer`
[INFO] [stdout]   --> src/ch07/mod.rs:50:14
[INFO] [stdout]    |
[INFO] [stdout] 50 |     pub enum Appetizer {
[INFO] [stdout]    |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet_trio`
[INFO] [stdout]   --> src/ch07/mod.rs:63:12
[INFO] [stdout]    |
[INFO] [stdout] 63 |     pub fn clarinet_trio() {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet_trio`
[INFO] [stdout]    --> src/ch07/mod.rs:160:20
[INFO] [stdout]     |
[INFO] [stdout] 160 |             pub fn clarinet_trio() {
[INFO] [stdout]     |                    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet`
[INFO] [stdout]  --> src/ch07/mod.rs:7:16
[INFO] [stdout]   |
[INFO] [stdout] 7 |         pub fn clarinet() {
[INFO] [stdout]   |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet`
[INFO] [stdout]  --> src/ch07/sound1.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 |     pub fn clarinet() {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet`
[INFO] [stdout]  --> src/ch07/sound2/instrument.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn clarinet() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet`
[INFO] [stdout]  --> src/ch07/sound3/instrument.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn clarinet() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet`
[INFO] [stdout]    --> src/ch07/mod.rs:150:24
[INFO] [stdout]     |
[INFO] [stdout] 150 |                 pub fn clarinet() {
[INFO] [stdout]     |                        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `changeColorMessage` should have a snake case name
[INFO] [stdout]   --> src/ch06.rs:87:13
[INFO] [stdout]    |
[INFO] [stdout] 87 |         let changeColorMessage = ChangeColorMessage(1, 1, 1);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `change_color_message`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Filter` that must be used
[INFO] [stdout]    --> src/ch06.rs:299:5
[INFO] [stdout]     |
[INFO] [stdout] 299 |     v.iter().filter(|x| matches!(x, MyEnum::Foo));
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: iterators are lazy and do nothing unless consumed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Float` should have a snake case name
[INFO] [stdout]    --> src/ch08_vec.rs:126:13
[INFO] [stdout]     |
[INFO] [stdout] 126 |             Float => (),
[INFO] [stdout]     |             ^^^^^ help: convert the identifier to snake case (notice the capitalization): `float`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Text` should have a snake case name
[INFO] [stdout]    --> src/ch08_vec.rs:127:13
[INFO] [stdout]     |
[INFO] [stdout] 127 |             Text => (),
[INFO] [stdout]     |             ^^^^ help: convert the identifier to snake case: `text`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Int` should have a snake case name
[INFO] [stdout]    --> src/ch08_vec.rs:128:13
[INFO] [stdout]     |
[INFO] [stdout] 128 |             Int => (),
[INFO] [stdout]     |             ^^^ help: convert the identifier to snake case (notice the capitalization): `int`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Value` should have a snake case name
[INFO] [stdout]   --> src/ch17.rs:18:22
[INFO] [stdout]    |
[INFO] [stdout] 18 |                 Some(Value) => {
[INFO] [stdout]    |                      ^^^^^ help: convert the identifier to snake case (notice the capitalization): `value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 181 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5m 11s
[INFO] running `Command { std: "docker" "inspect" "4f6623d6704f1bdbae07b324101634fc7b377a29efd9e4470fc8189a0ef82464", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f6623d6704f1bdbae07b324101634fc7b377a29efd9e4470fc8189a0ef82464", kill_on_drop: false }`
[INFO] [stdout] 4f6623d6704f1bdbae07b324101634fc7b377a29efd9e4470fc8189a0ef82464
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 72834a4048b93b78f0ed81585846fb1192576ffd50a5372ccdb08713d66cf946
[INFO] running `Command { std: "docker" "start" "-a" "72834a4048b93b78f0ed81585846fb1192576ffd50a5372ccdb08713d66cf946", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stdout] warning: crate `threadPool` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `thread_pool`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hosting` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:93:9
[INFO] [stdout]     |
[INFO] [stdout] 93  |     use crate::front_of_house::hosting;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 122 | pub use crate::front_of_house::hosting;
[INFO] [stdout]     |         ------------------------------ the item `hosting` is already imported here
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt`
[INFO] [stdout]    --> src/lib.rs:104:5
[INFO] [stdout]     |
[INFO] [stdout] 104 | use std::fmt;
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Result as IoResult`
[INFO] [stdout]    --> src/lib.rs:114:5
[INFO] [stdout]     |
[INFO] [stdout] 114 | use std::io::Result as IoResult;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `borrow`, `cmp::Ordering`
[INFO] [stdout]    --> src/lib.rs:128:11
[INFO] [stdout]     |
[INFO] [stdout] 128 | use std::{borrow, cmp::Ordering};
[INFO] [stdout]     |           ^^^^^^  ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Write`, `self`
[INFO] [stdout]    --> src/lib.rs:132:15
[INFO] [stdout]     |
[INFO] [stdout] 132 | use std::io::{self, Write}; // use io 本身 和 io::Write
[INFO] [stdout]     |               ^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::*`
[INFO] [stdout]    --> src/lib.rs:135:5
[INFO] [stdout]     |
[INFO] [stdout] 135 | use std::collections::*;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::process`
[INFO] [stdout]    --> src/lib.rs:141:5
[INFO] [stdout]     |
[INFO] [stdout] 141 | use std::process;
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order1`
[INFO] [stdout]   --> src/lib.rs:96:13
[INFO] [stdout]    |
[INFO] [stdout] 96 |         let order1 = back_of_house::Appetizer::Soup;
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order2`
[INFO] [stdout]   --> src/lib.rs:97:13
[INFO] [stdout]    |
[INFO] [stdout] 97 |         let order2 = back_of_house::Appetizer::Salad;
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c1`
[INFO] [stdout]    --> src/lib.rs:311:16
[INFO] [stdout]     |
[INFO] [stdout] 311 |     pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor {
[INFO] [stdout]     |                ^^ help: if this is intentional, prefix it with an underscore: `_c1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling the_rust_programming_language v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `c2`
[INFO] [stdout]    --> src/lib.rs:311:34
[INFO] [stdout]     |
[INFO] [stdout] 311 |     pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor {
[INFO] [stdout]     |                                  ^^ help: if this is intentional, prefix it with an underscore: `_c2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `serve_order`
[INFO] [stdout]   --> src/lib.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn serve_order() {}
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/lib.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn main() {}
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `eat_at_restaurant`
[INFO] [stdout]   --> src/lib.rs:95:12
[INFO] [stdout]    |
[INFO] [stdout] 95 |     pub fn eat_at_restaurant() {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fix_incorrect_order`
[INFO] [stdout]   --> src/lib.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn fix_incorrect_order() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `cook_order`
[INFO] [stdout]   --> src/lib.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn cook_order() {}
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `seasonal_fruit`
[INFO] [stdout]   --> src/lib.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |         seasonal_fruit: String,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Appetizer`
[INFO] [stdout]   --> src/lib.rs:55:14
[INFO] [stdout]    |
[INFO] [stdout] 55 |     pub enum Appetizer {
[INFO] [stdout]    |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 18 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around method argument
[INFO] [stdout]   --> src/ch02.rs:17:54
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let secret_number = rand::thread_rng().gen_range((1..=100)); // 这个也能运行
[INFO] [stdout]    |                                                      ^       ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 17 -     let secret_number = rand::thread_rng().gen_range((1..=100)); // 这个也能运行
[INFO] [stdout] 17 +     let secret_number = rand::thread_rng().gen_range(1..=100); // 这个也能运行
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]  --> src/ch03.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     /** 基本类型 */
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 7 |     // 直接的赋值能够直接推断出值的类型
[INFO] [stdout] 8 |     let a = 1; // 默认为 i32
[INFO] [stdout]   |     ---------- rustdoc does not generate documentation for statements
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout]   = help: use `/* */` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/ch03.rs:80:5
[INFO] [stdout]    |
[INFO] [stdout] 80 |     /** 复合类型 */
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 83 |     let _tup1: (i32, f64, u8) = (500, 6.4, 1); // 可以设置多种类型
[INFO] [stdout]    |     ------------------------------------------ rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `/* */` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/ch03.rs:154:5
[INFO] [stdout]     |
[INFO] [stdout] 154 |     /// 方法只要在作用域中声明 就能够调用(不用先声明在前)
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 155 |     fun_1();
[INFO] [stdout]     |     ------- rustdoc does not generate documentation for expressions
[INFO] [stdout]     |
[INFO] [stdout]     = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::any::Any`
[INFO] [stdout]  --> src/ch07/mod.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     use std::any::Any;
[INFO] [stdout]   |         ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]    --> src/ch07/mod.rs:118:9
[INFO] [stdout]     |
[INFO] [stdout] 118 |     use std::collections::HashMap; // 引入HashMap 的习惯用法 而不是 use std::collections; 在使用 collections::HashMap
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Result`
[INFO] [stdout]    --> src/ch07/mod.rs:139:13
[INFO] [stdout]     |
[INFO] [stdout] 139 |         use std::fmt::Result;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Result as IoResult`
[INFO] [stdout]    --> src/ch07/mod.rs:140:13
[INFO] [stdout]     |
[INFO] [stdout] 140 |         use std::io::Result as IoResult;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around method argument
[INFO] [stdout]    --> src/ch07/mod.rs:174:58
[INFO] [stdout]     |
[INFO] [stdout] 174 |         let secret_number = rand::thread_rng().gen_range((1..100));
[INFO] [stdout]     |                                                          ^      ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 174 -         let secret_number = rand::thread_rng().gen_range((1..100));
[INFO] [stdout] 174 +         let secret_number = rand::thread_rng().gen_range(1..100);
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around method argument
[INFO] [stdout]    --> src/ch07/mod.rs:175:58
[INFO] [stdout]     |
[INFO] [stdout] 175 |         let secret_number = rand::thread_rng().gen_range((1..=100));
[INFO] [stdout]     |                                                          ^       ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 175 -         let secret_number = rand::thread_rng().gen_range((1..=100));
[INFO] [stdout] 175 +         let secret_number = rand::thread_rng().gen_range(1..=100);
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cmp::Ordering`
[INFO] [stdout]    --> src/ch07/mod.rs:182:13
[INFO] [stdout]     |
[INFO] [stdout] 182 |         use std::cmp::Ordering;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]    --> src/ch07/mod.rs:183:13
[INFO] [stdout]     |
[INFO] [stdout] 183 |         use std::io;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `cmp::Ordering`, `io`
[INFO] [stdout]    --> src/ch07/mod.rs:187:19
[INFO] [stdout]     |
[INFO] [stdout] 187 |         use std::{cmp::Ordering, io};
[INFO] [stdout]     |                   ^^^^^^^^^^^^^  ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]    --> src/ch07/mod.rs:192:13
[INFO] [stdout]     |
[INFO] [stdout] 192 |         use std::io;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Write`
[INFO] [stdout]    --> src/ch07/mod.rs:193:13
[INFO] [stdout]     |
[INFO] [stdout] 193 |         use std::io::Write;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Write`, `self`
[INFO] [stdout]    --> src/ch07/mod.rs:197:23
[INFO] [stdout]     |
[INFO] [stdout] 197 |         use std::io::{self, Write};
[INFO] [stdout]     |                       ^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::*`
[INFO] [stdout]    --> src/ch07/mod.rs:203:13
[INFO] [stdout]     |
[INFO] [stdout] 203 |         use std::collections::*;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `File`, `self`
[INFO] [stdout]  --> src/ch08_hashmap.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::fs::{self, File};
[INFO] [stdout]   |               ^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/ch08_hashmap.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::ErrorKind`
[INFO] [stdout]  --> src/ch08_hashmap.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::io::ErrorKind;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]  --> src/ch08_hashmap.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io::Read;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Add`
[INFO] [stdout]  --> src/ch08_hashmap.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::ops::Add;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `HashMap` is imported redundantly
[INFO] [stdout]   --> src/ch08_hashmap.rs:17:13
[INFO] [stdout]    |
[INFO] [stdout] 3  | use std::collections::*;
[INFO] [stdout]    |     ------------------- the item `HashMap` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 17 |         use std::collections::HashMap;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::*`
[INFO] [stdout]  --> src/ch08_string.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `File`, `self`
[INFO] [stdout]  --> src/ch08_string.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::fs::{self, File};
[INFO] [stdout]   |               ^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/ch08_string.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::ErrorKind`
[INFO] [stdout]  --> src/ch08_string.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::io::ErrorKind;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::*`
[INFO] [stdout]  --> src/ch08_vec.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `File`, `self`
[INFO] [stdout]  --> src/ch08_vec.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::fs::{self, File};
[INFO] [stdout]   |               ^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/ch08_vec.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::ErrorKind`
[INFO] [stdout]  --> src/ch08_vec.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::io::ErrorKind;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]  --> src/ch08_vec.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io::Read;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Add`
[INFO] [stdout]  --> src/ch08_vec.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::ops::Add;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `io` is imported redundantly
[INFO] [stdout]    --> src/ch08_vec.rs:276:23
[INFO] [stdout]     |
[INFO] [stdout] 5   | use std::io;
[INFO] [stdout]     |     ------- the item `io` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 276 |         use std::io::{self, Write};
[INFO] [stdout]     |                       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/ch08_vec.rs:329:5
[INFO] [stdout]     |
[INFO] [stdout] 329 | /     /// ```
[INFO] [stdout] 330 | |     /// pub fn dedup_by_key<F, K>(&mut self, key: F)
[INFO] [stdout] 331 | |     /// where
[INFO] [stdout] 332 | |     ///     F: FnMut(&mut T) -> K,
[INFO] [stdout] 333 | |     ///     K: PartialEq<K>,
[INFO] [stdout] 334 | |     /// ```
[INFO] [stdout] 335 | |     /// 移除vec中 调用F方法后 相同返回值中的多余一个的其他元素
[INFO] [stdout]     | |______________________________________________________________^
[INFO] [stdout] 336 | /     {
[INFO] [stdout] 337 | |         let mut vec = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];
[INFO] [stdout] 338 | |
[INFO] [stdout] 339 | |         vec.dedup_by_key(|i| *i / 10);
[INFO] [stdout] ...   |
[INFO] [stdout] 344 | |         assert_eq!(vec, [1, 10]);
[INFO] [stdout] 345 | |     }
[INFO] [stdout]     | |_____- rustdoc does not generate documentation for expressions
[INFO] [stdout]     |
[INFO] [stdout]     = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/ch09.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::future::Future`
[INFO] [stdout]  --> src/ch09.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::future::Future;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Ref`
[INFO] [stdout]  --> src/ch15_04.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cell::{Ref, RefCell};
[INFO] [stdout]   |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ptr::read_volatile`
[INFO] [stdout]   --> src/ch16.rs:47:5
[INFO] [stdout]    |
[INFO] [stdout] 47 | use std::ptr::read_volatile;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]   --> src/ch16.rs:48:5
[INFO] [stdout]    |
[INFO] [stdout] 48 | use std::rc::Rc;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `mpsc` is imported redundantly
[INFO] [stdout]   --> src/ch16.rs:79:13
[INFO] [stdout]    |
[INFO] [stdout] 49 | use std::sync::{mpsc, Arc};
[INFO] [stdout]    |                 ---- the item `mpsc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 79 |         use std::sync::mpsc;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `thread` is imported redundantly
[INFO] [stdout]   --> src/ch16.rs:80:13
[INFO] [stdout]    |
[INFO] [stdout] 1  | use std::thread;
[INFO] [stdout]    |     ----------- the item `thread` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 80 |         use std::thread;
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Duration` is imported redundantly
[INFO] [stdout]   --> src/ch16.rs:81:13
[INFO] [stdout]    |
[INFO] [stdout] 2  | use std::time::Duration;
[INFO] [stdout]    |     ------------------- the item `Duration` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 81 |         use std::time::Duration;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/ch17.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::panic::RefUnwindSafe`
[INFO] [stdout]  --> src/ch19.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::panic::RefUnwindSafe;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `slice` is imported redundantly
[INFO] [stdout]    --> src/ch19.rs:117:17
[INFO] [stdout]     |
[INFO] [stdout] 92  |         use std::slice;
[INFO] [stdout]     |             ---------- the item `slice` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 117 |             use std::slice;
[INFO] [stdout]     |                 ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Add` is imported redundantly
[INFO] [stdout]    --> src/ch19.rs:310:17
[INFO] [stdout]     |
[INFO] [stdout] 277 |         use std::ops::Add;
[INFO] [stdout]     |             ------------- the item `Add` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 310 |             use std::ops::Add;
[INFO] [stdout]     |                 ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt`
[INFO] [stdout]    --> src/ch19.rs:507:13
[INFO] [stdout]     |
[INFO] [stdout] 507 |         use std::fmt;
[INFO] [stdout]     |             ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Error`
[INFO] [stdout]    --> src/ch19.rs:508:13
[INFO] [stdout]     |
[INFO] [stdout] 508 |         use std::io::Error;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self::proc_macro::TokenStream`
[INFO] [stdout]   --> src/ch19_06.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | use self::proc_macro::TokenStream;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `quote::quote`
[INFO] [stdout]   --> src/ch19_06.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 | use quote::quote;
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `syn`
[INFO] [stdout]   --> src/ch19_06.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 | use syn;
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `hex::hex`
[INFO] [stdout]   --> src/main.rs:58:5
[INFO] [stdout]    |
[INFO] [stdout] 58 | use hex::hex;
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `RefCell`, `Ref`
[INFO] [stdout]   --> src/main.rs:61:17
[INFO] [stdout]    |
[INFO] [stdout] 61 | use std::cell::{Ref, RefCell};
[INFO] [stdout]    |                 ^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Write`
[INFO] [stdout]   --> src/main.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 62 | use std::io::Write;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]   --> src/main.rs:63:5
[INFO] [stdout]    |
[INFO] [stdout] 63 | use std::rc::Rc;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `the_rust_programming_language::Config`
[INFO] [stdout]   --> src/main.rs:64:5
[INFO] [stdout]    |
[INFO] [stdout] 64 | use the_rust_programming_language::Config;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]  --> src/ch08_string.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io::Read;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/ch08_vec.rs:127:13
[INFO] [stdout]     |
[INFO] [stdout] 126 |             Float => (),
[INFO] [stdout]     |             ----- matches any value
[INFO] [stdout] 127 |             Text => (),
[INFO] [stdout]     |             ^^^^ unreachable pattern
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/ch08_vec.rs:128:13
[INFO] [stdout]     |
[INFO] [stdout] 126 |             Float => (),
[INFO] [stdout]     |             ----- matches any value
[INFO] [stdout] 127 |             Text => (),
[INFO] [stdout] 128 |             Int => (),
[INFO] [stdout]     |             ^^^ unreachable pattern
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `a` is never read
[INFO] [stdout]    --> src/ch03.rs:123:5
[INFO] [stdout]     |
[INFO] [stdout] 123 |     a = [1, 2, 3, 4, 5];
[INFO] [stdout]     |     ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/ch06.rs:276:18
[INFO] [stdout]     |
[INFO] [stdout] 276 |             _ => count += 1,
[INFO] [stdout]     |                  ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/ch06.rs:286:13
[INFO] [stdout]     |
[INFO] [stdout] 286 |             count += 1;
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `result` is never read
[INFO] [stdout]    --> src/ch10.rs:688:13
[INFO] [stdout]     |
[INFO] [stdout] 688 |             result = longest(string1.as_str(), string2.as_str());
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/ch04.rs:211:13
[INFO] [stdout]     |
[INFO] [stdout] 211 |         let mut s = String::from("hello");
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/ch04.rs:298:13
[INFO] [stdout]     |
[INFO] [stdout] 298 |         let mut s = String::from("hello world");
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ch08_string.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |         let mut a = String::new(); // 使用类似Vector 的方法 新建一个空的字符串
[INFO] [stdout]    |             ----^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ch08_string.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |         let mut s3 = s1 + &s2 + &s4; // 注意 s1 被移动了，不能继续使用 s2 s3 可以继续使用
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ch08_string.rs:60:13
[INFO] [stdout]    |
[INFO] [stdout] 60 |         let mut t3 = String::from("") + &s2 + &s3;
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/ch10.rs:842:13
[INFO] [stdout]     |
[INFO] [stdout] 842 |         let mut s: &'static str = "I have a static lifetime.";
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]   --> src/ch18.rs:85:9
[INFO] [stdout]    |
[INFO] [stdout] 85 |         fn print_coordinates(&(x, y): &(i32, i32)) {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stdout] ...
[INFO] [stdout] 89 |             print_coordinates(&point);
[INFO] [stdout]    |             ------------------------- recursive call site
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stdout]    = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: private type `ch10_02_traits::Point<T, S>` in public interface (error E0446)
[INFO] [stdout]    --> src/ch10.rs:220:13
[INFO] [stdout]     |
[INFO] [stdout] 220 |             fn summarize1(&self) -> Point<T, S>;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(private_in_public)]` on by default
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: private type `ch10_02_traits::Point<i32, f64>` in public interface (error E0446)
[INFO] [stdout]    --> src/ch10.rs:238:13
[INFO] [stdout]     |
[INFO] [stdout] 238 |             fn summarize1(&self) -> Point<i32, f64> {
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch01.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch02_00_guessing_game_tutorial`
[INFO] [stdout]   --> src/ch02.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn ch02_00_guessing_game_tutorial() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch03_02_data_types`
[INFO] [stdout]  --> src/ch03.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn ch03_02_data_types() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch03_03_how_functions_work`
[INFO] [stdout]    --> src/ch03.rs:135:8
[INFO] [stdout]     |
[INFO] [stdout] 135 | pub fn ch03_03_how_functions_work() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch03_05_control_flow`
[INFO] [stdout]    --> src/ch03.rs:181:8
[INFO] [stdout]     |
[INFO] [stdout] 181 | pub fn ch03_05_control_flow() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fun_2`
[INFO] [stdout]    --> src/ch03.rs:257:4
[INFO] [stdout]     |
[INFO] [stdout] 257 | fn fun_2() {}
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch04_01_what_is_ownership`
[INFO] [stdout]   --> src/ch04.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub fn ch04_01_what_is_ownership() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch04_02_references_and_borrowing`
[INFO] [stdout]    --> src/ch04.rs:139:8
[INFO] [stdout]     |
[INFO] [stdout] 139 | pub fn ch04_02_references_and_borrowing() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch04_03_slices`
[INFO] [stdout]    --> src/ch04.rs:238:8
[INFO] [stdout]     |
[INFO] [stdout] 238 | pub fn ch04_03_slices() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch05_01_defining_structs`
[INFO] [stdout]  --> src/ch05.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn ch05_01_defining_structs() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch05_02_example_structs`
[INFO] [stdout]    --> src/ch05.rs:155:8
[INFO] [stdout]     |
[INFO] [stdout] 155 | pub fn ch05_02_example_structs() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch05_03_method_syntax`
[INFO] [stdout]    --> src/ch05.rs:224:8
[INFO] [stdout]     |
[INFO] [stdout] 224 | pub fn ch05_03_method_syntax() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch06_01_defining_an_enum`
[INFO] [stdout]  --> src/ch06.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn ch06_01_defining_an_enum() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch06_02_match`
[INFO] [stdout]    --> src/ch06.rs:125:8
[INFO] [stdout]     |
[INFO] [stdout] 125 | pub fn ch06_02_match() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alabama`
[INFO] [stdout]    --> src/ch06.rs:228:5
[INFO] [stdout]     |
[INFO] [stdout] 228 |     Alabama,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    --> src/ch06.rs:226:10
[INFO] [stdout]     |
[INFO] [stdout] 226 | #[derive(Debug)]
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alaska`
[INFO] [stdout]    --> src/ch06.rs:229:5
[INFO] [stdout]     |
[INFO] [stdout] 229 |     Alaska,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    --> src/ch06.rs:226:10
[INFO] [stdout]     |
[INFO] [stdout] 226 | #[derive(Debug)]
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `A1`
[INFO] [stdout]    --> src/ch06.rs:230:5
[INFO] [stdout]     |
[INFO] [stdout] 230 |     A1(B1), // --snip--
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    --> src/ch06.rs:226:10
[INFO] [stdout]     |
[INFO] [stdout] 226 | #[derive(Debug)]
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `B2`
[INFO] [stdout]    --> src/ch06.rs:235:5
[INFO] [stdout]     |
[INFO] [stdout] 235 |     B2,
[INFO] [stdout]     |     ^^
[INFO] [stdout]     |
[INFO] [stdout] note: `B1` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    --> src/ch06.rs:233:10
[INFO] [stdout]     |
[INFO] [stdout] 233 | #[derive(Debug)]
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `B3`
[INFO] [stdout]    --> src/ch06.rs:236:5
[INFO] [stdout]     |
[INFO] [stdout] 236 |     B3,
[INFO] [stdout]     |     ^^
[INFO] [stdout]     |
[INFO] [stdout] note: `B1` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    --> src/ch06.rs:233:10
[INFO] [stdout]     |
[INFO] [stdout] 233 | #[derive(Debug)]
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Coin`
[INFO] [stdout]    --> src/ch06.rs:240:6
[INFO] [stdout]     |
[INFO] [stdout] 240 | enum Coin {
[INFO] [stdout]     |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch06_03_if_let`
[INFO] [stdout]    --> src/ch06.rs:248:8
[INFO] [stdout]     |
[INFO] [stdout] 248 | pub fn ch06_03_if_let() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch06_03_matches`
[INFO] [stdout]    --> src/ch06.rs:292:8
[INFO] [stdout]     |
[INFO] [stdout] 292 | pub fn ch06_03_matches() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/ch07/mod.rs:79:8
[INFO] [stdout]    |
[INFO] [stdout] 79 | pub fn main() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch08_03_hash_maps`
[INFO] [stdout]   --> src/ch08_hashmap.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn ch08_03_hash_maps() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch08_02_strings`
[INFO] [stdout]   --> src/ch08_string.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn ch08_02_strings() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch08_01_vectors`
[INFO] [stdout]   --> src/ch08_vec.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn ch08_01_vectors() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch09_01_unrecoverable_errors_with_panic`
[INFO] [stdout]   --> src/ch09.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn ch09_01_unrecoverable_errors_with_panic() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch09_02_recoverable_errors_with_result`
[INFO] [stdout]   --> src/ch09.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub fn ch09_02_recoverable_errors_with_result() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch09_03_to_panic_or_not_to_panic`
[INFO] [stdout]    --> src/ch09.rs:177:8
[INFO] [stdout]     |
[INFO] [stdout] 177 | pub fn ch09_03_to_panic_or_not_to_panic() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch10_00_generics`
[INFO] [stdout]  --> src/ch10.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn ch10_00_generics() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch10_01_syntax`
[INFO] [stdout]   --> src/ch10.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub fn ch10_01_syntax() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch10_02_traits`
[INFO] [stdout]    --> src/ch10.rs:159:8
[INFO] [stdout]     |
[INFO] [stdout] 159 | pub fn ch10_02_traits() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch10_03_lifetime_syntax`
[INFO] [stdout]    --> src/ch10.rs:626:8
[INFO] [stdout]     |
[INFO] [stdout] 626 | pub fn ch10_03_lifetime_syntax() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `length`
[INFO] [stdout]  --> src/ch11_01.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     length: u32,
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]  --> src/ch11_01.rs:3:10
[INFO] [stdout]   |
[INFO] [stdout] 3 | #[derive(Debug)]
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout]   = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]  --> src/ch11_01.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     width: u32,
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]  --> src/ch11_01.rs:3:10
[INFO] [stdout]   |
[INFO] [stdout] 3 | #[derive(Debug)]
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout]   = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/ch11_01.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 |     pub fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_two`
[INFO] [stdout]   --> src/ch11_01.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 | pub fn add_two(a: i32) -> i32 {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `greeting`
[INFO] [stdout]    --> src/ch11_01.rs:112:8
[INFO] [stdout]     |
[INFO] [stdout] 112 | pub fn greeting(name: &str) -> String {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Guess`
[INFO] [stdout]    --> src/ch11_01.rs:132:12
[INFO] [stdout]     |
[INFO] [stdout] 132 | pub struct Guess {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/ch11_01.rs:137:12
[INFO] [stdout]     |
[INFO] [stdout] 137 |     pub fn new(value: i32) -> Guess {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `prints_and_returns_10`
[INFO] [stdout]   --> src/ch11_02.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn prints_and_returns_10(a: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_two`
[INFO] [stdout]   --> src/ch11_02.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | pub fn add_two(a: i32) -> i32 {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_two`
[INFO] [stdout]   --> src/ch11_03.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn add_two(a: i32) -> i32 {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `internal_adder`
[INFO] [stdout]   --> src/ch11_03.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn internal_adder(a: i32, b: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Config`
[INFO] [stdout]   --> src/ch12.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Config<'a> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/ch12.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn new(args: &[String]) -> Result<Config, &'static str> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `minigrep`
[INFO] [stdout]   --> src/ch12.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | pub fn minigrep() {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]   --> src/ch12.rs:61:4
[INFO] [stdout]    |
[INFO] [stdout] 61 | fn run(config: Config) -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `search`
[INFO] [stdout]   --> src/ch12.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch13_01_closures`
[INFO] [stdout]  --> src/ch13.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn ch13_01_closures() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch13_02_iterators`
[INFO] [stdout]    --> src/ch13.rs:224:8
[INFO] [stdout]     |
[INFO] [stdout] 224 | pub fn ch13_02_iterators() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch13_04_performance`
[INFO] [stdout]    --> src/ch13.rs:392:8
[INFO] [stdout]     |
[INFO] [stdout] 392 | pub fn ch13_04_performance(buffer: &mut [i32], coefficients: [i64; 12], qlp_shift: i16) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch14_01_release_profiles`
[INFO] [stdout]   --> src/ch14.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn ch14_01_release_profiles() {}
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch14_02_publishing_to_crates_io`
[INFO] [stdout]   --> src/ch14.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn ch14_02_publishing_to_crates_io() {}
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch15_01_box`
[INFO] [stdout]   --> src/ch15.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn ch15_01_box() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch15_02_deref`
[INFO] [stdout]   --> src/ch15.rs:89:8
[INFO] [stdout]    |
[INFO] [stdout] 89 | pub fn ch15_02_deref() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch15_03_drop`
[INFO] [stdout]    --> src/ch15.rs:182:8
[INFO] [stdout]     |
[INFO] [stdout] 182 | pub fn ch15_03_drop() {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `List`
[INFO] [stdout]    --> src/ch15.rs:247:6
[INFO] [stdout]     |
[INFO] [stdout] 247 | enum List {
[INFO] [stdout]     |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch15_04_rc`
[INFO] [stdout]    --> src/ch15.rs:252:8
[INFO] [stdout]     |
[INFO] [stdout] 252 | pub fn ch15_04_rc() {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `LimitTracker`
[INFO] [stdout]    --> src/ch15.rs:347:12
[INFO] [stdout]     |
[INFO] [stdout] 347 | pub struct LimitTracker<'a, T: Messenger> {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/ch15.rs:357:12
[INFO] [stdout]     |
[INFO] [stdout] 357 |     pub fn new(messenger: &T, max: usize) -> LimitTracker<T> {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `set_value`
[INFO] [stdout]    --> src/ch15.rs:365:12
[INFO] [stdout]     |
[INFO] [stdout] 365 |     pub fn set_value(&mut self, value: usize) {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cons`
[INFO] [stdout]   --> src/ch15_02.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_02.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nil`
[INFO] [stdout]   --> src/ch15_02.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     Nil,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_02.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/ch15_02.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn main() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cons`
[INFO] [stdout]   --> src/ch15_03.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_03.rs:11:10
[INFO] [stdout]    |
[INFO] [stdout] 11 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nil`
[INFO] [stdout]   --> src/ch15_03.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     Nil,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_03.rs:11:10
[INFO] [stdout]    |
[INFO] [stdout] 11 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]   --> src/ch15_03.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/ch15_03.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub fn main() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]   --> src/ch15_04.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     value: i32,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_04.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `parent`
[INFO] [stdout]   --> src/ch15_04.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     parent: RefCell<Weak<Node>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_04.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `children`
[INFO] [stdout]   --> src/ch15_04.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_04.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/ch15_04.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn main() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch16_01_threads`
[INFO] [stdout]   --> src/ch16.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn ch16_01_threads() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch16_02_message_passing`
[INFO] [stdout]   --> src/ch16.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | pub fn ch16_02_message_passing() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch16_03_shared_state`
[INFO] [stdout]    --> src/ch16.rs:140:8
[INFO] [stdout]     |
[INFO] [stdout] 140 | pub fn ch16_03_shared_state() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch16_04_extensible_concurrency_sync_and_send`
[INFO] [stdout]    --> src/ch16.rs:218:8
[INFO] [stdout]     |
[INFO] [stdout] 218 | pub fn ch16_04_extensible_concurrency_sync_and_send() {}
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch17_01whatis_oo`
[INFO] [stdout]  --> src/ch17.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn ch17_01whatis_oo() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch17_02_trait_objects`
[INFO] [stdout]   --> src/ch17.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub fn ch17_02_trait_objects() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch17_03_oo_design_patterns`
[INFO] [stdout]    --> src/ch17.rs:226:8
[INFO] [stdout]     |
[INFO] [stdout] 226 | pub fn ch17_03_oo_design_patterns() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch18_01_all_the_places_for_patterns`
[INFO] [stdout]  --> src/ch18.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn ch18_01_all_the_places_for_patterns() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch18_02_refutability`
[INFO] [stdout]   --> src/ch18.rs:95:8
[INFO] [stdout]    |
[INFO] [stdout] 95 | pub fn ch18_02_refutability() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch18_03_pattern_syntax`
[INFO] [stdout]    --> src/ch18.rs:104:8
[INFO] [stdout]     |
[INFO] [stdout] 104 | pub fn ch18_03_pattern_syntax() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch19_01_unsafe_rust`
[INFO] [stdout]  --> src/ch19.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn ch19_01_unsafe_rust() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch19_03_advanced_traits`
[INFO] [stdout]    --> src/ch19.rs:213:8
[INFO] [stdout]     |
[INFO] [stdout] 213 | pub fn ch19_03_advanced_traits() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch19_04_advanced_types`
[INFO] [stdout]    --> src/ch19.rs:475:8
[INFO] [stdout]     |
[INFO] [stdout] 475 | pub fn ch19_04_advanced_types() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch19_05_advanced_functions_and_closures`
[INFO] [stdout]    --> src/ch19.rs:661:8
[INFO] [stdout]     |
[INFO] [stdout] 661 | pub fn ch19_05_advanced_functions_and_closures() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/ch19_06.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch20.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `handle_connection`
[INFO] [stdout]   --> src/ch20.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn handle_connection(mut stream: TcpStream) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `breathe_in`
[INFO] [stdout]   --> src/ch07/mod.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn breathe_in() {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Vegetable`
[INFO] [stdout]   --> src/ch07/mod.rs:26:16
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub struct Vegetable {
[INFO] [stdout]    |                ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/ch07/mod.rs:32:16
[INFO] [stdout]    |
[INFO] [stdout] 32 |         pub fn new(name: &str) -> Vegetable {
[INFO] [stdout]    |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `generate_struct`
[INFO] [stdout]   --> src/ch07/mod.rs:40:12
[INFO] [stdout]    |
[INFO] [stdout] 40 |     pub fn generate_struct() -> Vegetable {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Appetizer`
[INFO] [stdout]   --> src/ch07/mod.rs:50:14
[INFO] [stdout]    |
[INFO] [stdout] 50 |     pub enum Appetizer {
[INFO] [stdout]    |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet_trio`
[INFO] [stdout]   --> src/ch07/mod.rs:63:12
[INFO] [stdout]    |
[INFO] [stdout] 63 |     pub fn clarinet_trio() {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet_trio`
[INFO] [stdout]    --> src/ch07/mod.rs:160:20
[INFO] [stdout]     |
[INFO] [stdout] 160 |             pub fn clarinet_trio() {
[INFO] [stdout]     |                    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet`
[INFO] [stdout]  --> src/ch07/mod.rs:7:16
[INFO] [stdout]   |
[INFO] [stdout] 7 |         pub fn clarinet() {
[INFO] [stdout]   |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet`
[INFO] [stdout]  --> src/ch07/sound1.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 |     pub fn clarinet() {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet`
[INFO] [stdout]  --> src/ch07/sound2/instrument.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn clarinet() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet`
[INFO] [stdout]  --> src/ch07/sound3/instrument.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn clarinet() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet`
[INFO] [stdout]    --> src/ch07/mod.rs:150:24
[INFO] [stdout]     |
[INFO] [stdout] 150 |                 pub fn clarinet() {
[INFO] [stdout]     |                        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `changeColorMessage` should have a snake case name
[INFO] [stdout]   --> src/ch06.rs:87:13
[INFO] [stdout]    |
[INFO] [stdout] 87 |         let changeColorMessage = ChangeColorMessage(1, 1, 1);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `change_color_message`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Filter` that must be used
[INFO] [stdout]    --> src/ch06.rs:299:5
[INFO] [stdout]     |
[INFO] [stdout] 299 |     v.iter().filter(|x| matches!(x, MyEnum::Foo));
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: iterators are lazy and do nothing unless consumed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Float` should have a snake case name
[INFO] [stdout]    --> src/ch08_vec.rs:126:13
[INFO] [stdout]     |
[INFO] [stdout] 126 |             Float => (),
[INFO] [stdout]     |             ^^^^^ help: convert the identifier to snake case (notice the capitalization): `float`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Text` should have a snake case name
[INFO] [stdout]    --> src/ch08_vec.rs:127:13
[INFO] [stdout]     |
[INFO] [stdout] 127 |             Text => (),
[INFO] [stdout]     |             ^^^^ help: convert the identifier to snake case: `text`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Int` should have a snake case name
[INFO] [stdout]    --> src/ch08_vec.rs:128:13
[INFO] [stdout]     |
[INFO] [stdout] 128 |             Int => (),
[INFO] [stdout]     |             ^^^ help: convert the identifier to snake case (notice the capitalization): `int`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Value` should have a snake case name
[INFO] [stdout]   --> src/ch17.rs:18:22
[INFO] [stdout]    |
[INFO] [stdout] 18 |                 Some(Value) => {
[INFO] [stdout]    |                      ^^^^^ help: convert the identifier to snake case (notice the capitalization): `value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 181 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hosting` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:93:9
[INFO] [stdout]     |
[INFO] [stdout] 93  |     use crate::front_of_house::hosting;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 122 | pub use crate::front_of_house::hosting;
[INFO] [stdout]     |         ------------------------------ the item `hosting` is already imported here
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt`
[INFO] [stdout]    --> src/lib.rs:104:5
[INFO] [stdout]     |
[INFO] [stdout] 104 | use std::fmt;
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Result as IoResult`
[INFO] [stdout]    --> src/lib.rs:114:5
[INFO] [stdout]     |
[INFO] [stdout] 114 | use std::io::Result as IoResult;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `borrow`, `cmp::Ordering`
[INFO] [stdout]    --> src/lib.rs:128:11
[INFO] [stdout]     |
[INFO] [stdout] 128 | use std::{borrow, cmp::Ordering};
[INFO] [stdout]     |           ^^^^^^  ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Write`, `self`
[INFO] [stdout]    --> src/lib.rs:132:15
[INFO] [stdout]     |
[INFO] [stdout] 132 | use std::io::{self, Write}; // use io 本身 和 io::Write
[INFO] [stdout]     |               ^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::*`
[INFO] [stdout]    --> src/lib.rs:135:5
[INFO] [stdout]     |
[INFO] [stdout] 135 | use std::collections::*;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::process`
[INFO] [stdout]    --> src/lib.rs:141:5
[INFO] [stdout]     |
[INFO] [stdout] 141 | use std::process;
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test2`
[INFO] [stdout]   --> tests/integration_test.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn test2() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order1`
[INFO] [stdout]   --> src/lib.rs:96:13
[INFO] [stdout]    |
[INFO] [stdout] 96 |         let order1 = back_of_house::Appetizer::Soup;
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order2`
[INFO] [stdout]   --> src/lib.rs:97:13
[INFO] [stdout]    |
[INFO] [stdout] 97 |         let order2 = back_of_house::Appetizer::Salad;
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c1`
[INFO] [stdout]    --> src/lib.rs:311:16
[INFO] [stdout]     |
[INFO] [stdout] 311 |     pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor {
[INFO] [stdout]     |                ^^ help: if this is intentional, prefix it with an underscore: `_c1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c2`
[INFO] [stdout]    --> src/lib.rs:311:34
[INFO] [stdout]     |
[INFO] [stdout] 311 |     pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor {
[INFO] [stdout]     |                                  ^^ help: if this is intentional, prefix it with an underscore: `_c2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `serve_order`
[INFO] [stdout]   --> src/lib.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn serve_order() {}
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `eat_at_restaurant`
[INFO] [stdout]   --> src/lib.rs:95:12
[INFO] [stdout]    |
[INFO] [stdout] 95 |     pub fn eat_at_restaurant() {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fix_incorrect_order`
[INFO] [stdout]   --> src/lib.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn fix_incorrect_order() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `cook_order`
[INFO] [stdout]   --> src/lib.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn cook_order() {}
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `seasonal_fruit`
[INFO] [stdout]   --> src/lib.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |         seasonal_fruit: String,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Appetizer`
[INFO] [stdout]   --> src/lib.rs:55:14
[INFO] [stdout]    |
[INFO] [stdout] 55 |     pub enum Appetizer {
[INFO] [stdout]    |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around method argument
[INFO] [stdout]   --> src/ch02.rs:17:54
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let secret_number = rand::thread_rng().gen_range((1..=100)); // 这个也能运行
[INFO] [stdout]    |                                                      ^       ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 17 -     let secret_number = rand::thread_rng().gen_range((1..=100)); // 这个也能运行
[INFO] [stdout] 17 +     let secret_number = rand::thread_rng().gen_range(1..=100); // 这个也能运行
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]  --> src/ch03.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     /** 基本类型 */
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 7 |     // 直接的赋值能够直接推断出值的类型
[INFO] [stdout] 8 |     let a = 1; // 默认为 i32
[INFO] [stdout]   |     ---------- rustdoc does not generate documentation for statements
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout]   = help: use `/* */` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/ch03.rs:80:5
[INFO] [stdout]    |
[INFO] [stdout] 80 |     /** 复合类型 */
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 83 |     let _tup1: (i32, f64, u8) = (500, 6.4, 1); // 可以设置多种类型
[INFO] [stdout]    |     ------------------------------------------ rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `/* */` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/ch03.rs:154:5
[INFO] [stdout]     |
[INFO] [stdout] 154 |     /// 方法只要在作用域中声明 就能够调用(不用先声明在前)
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 155 |     fun_1();
[INFO] [stdout]     |     ------- rustdoc does not generate documentation for expressions
[INFO] [stdout]     |
[INFO] [stdout]     = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::any::Any`
[INFO] [stdout]  --> src/ch07/mod.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     use std::any::Any;
[INFO] [stdout]   |         ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]    --> src/ch07/mod.rs:118:9
[INFO] [stdout]     |
[INFO] [stdout] 118 |     use std::collections::HashMap; // 引入HashMap 的习惯用法 而不是 use std::collections; 在使用 collections::HashMap
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Result`
[INFO] [stdout]    --> src/ch07/mod.rs:139:13
[INFO] [stdout]     |
[INFO] [stdout] 139 |         use std::fmt::Result;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Result as IoResult`
[INFO] [stdout]    --> src/ch07/mod.rs:140:13
[INFO] [stdout]     |
[INFO] [stdout] 140 |         use std::io::Result as IoResult;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around method argument
[INFO] [stdout]    --> src/ch07/mod.rs:174:58
[INFO] [stdout]     |
[INFO] [stdout] 174 |         let secret_number = rand::thread_rng().gen_range((1..100));
[INFO] [stdout]     |                                                          ^      ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 174 -         let secret_number = rand::thread_rng().gen_range((1..100));
[INFO] [stdout] 174 +         let secret_number = rand::thread_rng().gen_range(1..100);
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around method argument
[INFO] [stdout]    --> src/ch07/mod.rs:175:58
[INFO] [stdout]     |
[INFO] [stdout] 175 |         let secret_number = rand::thread_rng().gen_range((1..=100));
[INFO] [stdout]     |                                                          ^       ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 175 -         let secret_number = rand::thread_rng().gen_range((1..=100));
[INFO] [stdout] 175 +         let secret_number = rand::thread_rng().gen_range(1..=100);
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cmp::Ordering`
[INFO] [stdout]    --> src/ch07/mod.rs:182:13
[INFO] [stdout]     |
[INFO] [stdout] 182 |         use std::cmp::Ordering;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]    --> src/ch07/mod.rs:183:13
[INFO] [stdout]     |
[INFO] [stdout] 183 |         use std::io;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `cmp::Ordering`, `io`
[INFO] [stdout]    --> src/ch07/mod.rs:187:19
[INFO] [stdout]     |
[INFO] [stdout] 187 |         use std::{cmp::Ordering, io};
[INFO] [stdout]     |                   ^^^^^^^^^^^^^  ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]    --> src/ch07/mod.rs:192:13
[INFO] [stdout]     |
[INFO] [stdout] 192 |         use std::io;
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Write`
[INFO] [stdout]    --> src/ch07/mod.rs:193:13
[INFO] [stdout]     |
[INFO] [stdout] 193 |         use std::io::Write;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Write`, `self`
[INFO] [stdout]    --> src/ch07/mod.rs:197:23
[INFO] [stdout]     |
[INFO] [stdout] 197 |         use std::io::{self, Write};
[INFO] [stdout]     |                       ^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::*`
[INFO] [stdout]    --> src/ch07/mod.rs:203:13
[INFO] [stdout]     |
[INFO] [stdout] 203 |         use std::collections::*;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `File`, `self`
[INFO] [stdout]  --> src/ch08_hashmap.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::fs::{self, File};
[INFO] [stdout]   |               ^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/ch08_hashmap.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::ErrorKind`
[INFO] [stdout]  --> src/ch08_hashmap.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::io::ErrorKind;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]  --> src/ch08_hashmap.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io::Read;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Add`
[INFO] [stdout]  --> src/ch08_hashmap.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::ops::Add;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `HashMap` is imported redundantly
[INFO] [stdout]   --> src/ch08_hashmap.rs:17:13
[INFO] [stdout]    |
[INFO] [stdout] 3  | use std::collections::*;
[INFO] [stdout]    |     ------------------- the item `HashMap` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 17 |         use std::collections::HashMap;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::*`
[INFO] [stdout]  --> src/ch08_string.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `File`, `self`
[INFO] [stdout]  --> src/ch08_string.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::fs::{self, File};
[INFO] [stdout]   |               ^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/ch08_string.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::ErrorKind`
[INFO] [stdout]  --> src/ch08_string.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::io::ErrorKind;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::*`
[INFO] [stdout]  --> src/ch08_vec.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `File`, `self`
[INFO] [stdout]  --> src/ch08_vec.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::fs::{self, File};
[INFO] [stdout]   |               ^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/ch08_vec.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::ErrorKind`
[INFO] [stdout]  --> src/ch08_vec.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::io::ErrorKind;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]  --> src/ch08_vec.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io::Read;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Add`
[INFO] [stdout]  --> src/ch08_vec.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::ops::Add;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `io` is imported redundantly
[INFO] [stdout]    --> src/ch08_vec.rs:276:23
[INFO] [stdout]     |
[INFO] [stdout] 5   | use std::io;
[INFO] [stdout]     |     ------- the item `io` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 276 |         use std::io::{self, Write};
[INFO] [stdout]     |                       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/ch08_vec.rs:329:5
[INFO] [stdout]     |
[INFO] [stdout] 329 | /     /// ```
[INFO] [stdout] 330 | |     /// pub fn dedup_by_key<F, K>(&mut self, key: F)
[INFO] [stdout] 331 | |     /// where
[INFO] [stdout] 332 | |     ///     F: FnMut(&mut T) -> K,
[INFO] [stdout] 333 | |     ///     K: PartialEq<K>,
[INFO] [stdout] 334 | |     /// ```
[INFO] [stdout] 335 | |     /// 移除vec中 调用F方法后 相同返回值中的多余一个的其他元素
[INFO] [stdout]     | |______________________________________________________________^
[INFO] [stdout] 336 | /     {
[INFO] [stdout] 337 | |         let mut vec = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];
[INFO] [stdout] 338 | |
[INFO] [stdout] 339 | |         vec.dedup_by_key(|i| *i / 10);
[INFO] [stdout] ...   |
[INFO] [stdout] 344 | |         assert_eq!(vec, [1, 10]);
[INFO] [stdout] 345 | |     }
[INFO] [stdout]     | |_____- rustdoc does not generate documentation for expressions
[INFO] [stdout]     |
[INFO] [stdout]     = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/ch09.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::future::Future`
[INFO] [stdout]  --> src/ch09.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::future::Future;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Ref`
[INFO] [stdout]  --> src/ch15_04.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cell::{Ref, RefCell};
[INFO] [stdout]   |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ptr::read_volatile`
[INFO] [stdout]   --> src/ch16.rs:47:5
[INFO] [stdout]    |
[INFO] [stdout] 47 | use std::ptr::read_volatile;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]   --> src/ch16.rs:48:5
[INFO] [stdout]    |
[INFO] [stdout] 48 | use std::rc::Rc;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `mpsc` is imported redundantly
[INFO] [stdout]   --> src/ch16.rs:79:13
[INFO] [stdout]    |
[INFO] [stdout] 49 | use std::sync::{mpsc, Arc};
[INFO] [stdout]    |                 ---- the item `mpsc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 79 |         use std::sync::mpsc;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `thread` is imported redundantly
[INFO] [stdout]   --> src/ch16.rs:80:13
[INFO] [stdout]    |
[INFO] [stdout] 1  | use std::thread;
[INFO] [stdout]    |     ----------- the item `thread` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 80 |         use std::thread;
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Duration` is imported redundantly
[INFO] [stdout]   --> src/ch16.rs:81:13
[INFO] [stdout]    |
[INFO] [stdout] 2  | use std::time::Duration;
[INFO] [stdout]    |     ------------------- the item `Duration` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 81 |         use std::time::Duration;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/ch17.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::panic::RefUnwindSafe`
[INFO] [stdout]  --> src/ch19.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::panic::RefUnwindSafe;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `slice` is imported redundantly
[INFO] [stdout]    --> src/ch19.rs:117:17
[INFO] [stdout]     |
[INFO] [stdout] 92  |         use std::slice;
[INFO] [stdout]     |             ---------- the item `slice` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 117 |             use std::slice;
[INFO] [stdout]     |                 ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Add` is imported redundantly
[INFO] [stdout]    --> src/ch19.rs:310:17
[INFO] [stdout]     |
[INFO] [stdout] 277 |         use std::ops::Add;
[INFO] [stdout]     |             ------------- the item `Add` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 310 |             use std::ops::Add;
[INFO] [stdout]     |                 ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt`
[INFO] [stdout]    --> src/ch19.rs:507:13
[INFO] [stdout]     |
[INFO] [stdout] 507 |         use std::fmt;
[INFO] [stdout]     |             ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Error`
[INFO] [stdout]    --> src/ch19.rs:508:13
[INFO] [stdout]     |
[INFO] [stdout] 508 |         use std::io::Error;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self::proc_macro::TokenStream`
[INFO] [stdout]   --> src/ch19_06.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | use self::proc_macro::TokenStream;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `quote::quote`
[INFO] [stdout]   --> src/ch19_06.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 | use quote::quote;
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `syn`
[INFO] [stdout]   --> src/ch19_06.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 | use syn;
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `hex::hex`
[INFO] [stdout]   --> src/main.rs:58:5
[INFO] [stdout]    |
[INFO] [stdout] 58 | use hex::hex;
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `RefCell`, `Ref`
[INFO] [stdout]   --> src/main.rs:61:17
[INFO] [stdout]    |
[INFO] [stdout] 61 | use std::cell::{Ref, RefCell};
[INFO] [stdout]    |                 ^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Write`
[INFO] [stdout]   --> src/main.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 62 | use std::io::Write;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]   --> src/main.rs:63:5
[INFO] [stdout]    |
[INFO] [stdout] 63 | use std::rc::Rc;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `the_rust_programming_language::Config`
[INFO] [stdout]   --> src/main.rs:64:5
[INFO] [stdout]    |
[INFO] [stdout] 64 | use the_rust_programming_language::Config;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]  --> src/ch08_string.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io::Read;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/ch08_vec.rs:127:13
[INFO] [stdout]     |
[INFO] [stdout] 126 |             Float => (),
[INFO] [stdout]     |             ----- matches any value
[INFO] [stdout] 127 |             Text => (),
[INFO] [stdout]     |             ^^^^ unreachable pattern
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/ch08_vec.rs:128:13
[INFO] [stdout]     |
[INFO] [stdout] 126 |             Float => (),
[INFO] [stdout]     |             ----- matches any value
[INFO] [stdout] 127 |             Text => (),
[INFO] [stdout] 128 |             Int => (),
[INFO] [stdout]     |             ^^^ unreachable pattern
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `a` is never read
[INFO] [stdout]    --> src/ch03.rs:123:5
[INFO] [stdout]     |
[INFO] [stdout] 123 |     a = [1, 2, 3, 4, 5];
[INFO] [stdout]     |     ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/ch06.rs:276:18
[INFO] [stdout]     |
[INFO] [stdout] 276 |             _ => count += 1,
[INFO] [stdout]     |                  ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/ch06.rs:286:13
[INFO] [stdout]     |
[INFO] [stdout] 286 |             count += 1;
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `result` is never read
[INFO] [stdout]    --> src/ch10.rs:688:13
[INFO] [stdout]     |
[INFO] [stdout] 688 |             result = longest(string1.as_str(), string2.as_str());
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/ch04.rs:211:13
[INFO] [stdout]     |
[INFO] [stdout] 211 |         let mut s = String::from("hello");
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/ch04.rs:298:13
[INFO] [stdout]     |
[INFO] [stdout] 298 |         let mut s = String::from("hello world");
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ch08_string.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |         let mut a = String::new(); // 使用类似Vector 的方法 新建一个空的字符串
[INFO] [stdout]    |             ----^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ch08_string.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |         let mut s3 = s1 + &s2 + &s4; // 注意 s1 被移动了，不能继续使用 s2 s3 可以继续使用
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ch08_string.rs:60:13
[INFO] [stdout]    |
[INFO] [stdout] 60 |         let mut t3 = String::from("") + &s2 + &s3;
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 17 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/ch10.rs:842:13
[INFO] [stdout]     |
[INFO] [stdout] 842 |         let mut s: &'static str = "I have a static lifetime.";
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]   --> src/ch18.rs:85:9
[INFO] [stdout]    |
[INFO] [stdout] 85 |         fn print_coordinates(&(x, y): &(i32, i32)) {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stdout] ...
[INFO] [stdout] 89 |             print_coordinates(&point);
[INFO] [stdout]    |             ------------------------- recursive call site
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stdout]    = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: private type `ch10_02_traits::Point<T, S>` in public interface (error E0446)
[INFO] [stdout]    --> src/ch10.rs:220:13
[INFO] [stdout]     |
[INFO] [stdout] 220 |             fn summarize1(&self) -> Point<T, S>;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(private_in_public)]` on by default
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: private type `ch10_02_traits::Point<i32, f64>` in public interface (error E0446)
[INFO] [stdout]    --> src/ch10.rs:238:13
[INFO] [stdout]     |
[INFO] [stdout] 238 |             fn summarize1(&self) -> Point<i32, f64> {
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch01.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch02_00_guessing_game_tutorial`
[INFO] [stdout]   --> src/ch02.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn ch02_00_guessing_game_tutorial() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch03_02_data_types`
[INFO] [stdout]  --> src/ch03.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn ch03_02_data_types() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch03_03_how_functions_work`
[INFO] [stdout]    --> src/ch03.rs:135:8
[INFO] [stdout]     |
[INFO] [stdout] 135 | pub fn ch03_03_how_functions_work() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch03_05_control_flow`
[INFO] [stdout]    --> src/ch03.rs:181:8
[INFO] [stdout]     |
[INFO] [stdout] 181 | pub fn ch03_05_control_flow() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fun_2`
[INFO] [stdout]    --> src/ch03.rs:257:4
[INFO] [stdout]     |
[INFO] [stdout] 257 | fn fun_2() {}
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch04_01_what_is_ownership`
[INFO] [stdout]   --> src/ch04.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub fn ch04_01_what_is_ownership() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch04_02_references_and_borrowing`
[INFO] [stdout]    --> src/ch04.rs:139:8
[INFO] [stdout]     |
[INFO] [stdout] 139 | pub fn ch04_02_references_and_borrowing() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch04_03_slices`
[INFO] [stdout]    --> src/ch04.rs:238:8
[INFO] [stdout]     |
[INFO] [stdout] 238 | pub fn ch04_03_slices() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch05_01_defining_structs`
[INFO] [stdout]  --> src/ch05.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn ch05_01_defining_structs() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch05_02_example_structs`
[INFO] [stdout]    --> src/ch05.rs:155:8
[INFO] [stdout]     |
[INFO] [stdout] 155 | pub fn ch05_02_example_structs() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch05_03_method_syntax`
[INFO] [stdout]    --> src/ch05.rs:224:8
[INFO] [stdout]     |
[INFO] [stdout] 224 | pub fn ch05_03_method_syntax() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch06_01_defining_an_enum`
[INFO] [stdout]  --> src/ch06.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn ch06_01_defining_an_enum() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch06_02_match`
[INFO] [stdout]    --> src/ch06.rs:125:8
[INFO] [stdout]     |
[INFO] [stdout] 125 | pub fn ch06_02_match() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alabama`
[INFO] [stdout]    --> src/ch06.rs:228:5
[INFO] [stdout]     |
[INFO] [stdout] 228 |     Alabama,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    --> src/ch06.rs:226:10
[INFO] [stdout]     |
[INFO] [stdout] 226 | #[derive(Debug)]
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alaska`
[INFO] [stdout]    --> src/ch06.rs:229:5
[INFO] [stdout]     |
[INFO] [stdout] 229 |     Alaska,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    --> src/ch06.rs:226:10
[INFO] [stdout]     |
[INFO] [stdout] 226 | #[derive(Debug)]
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `A1`
[INFO] [stdout]    --> src/ch06.rs:230:5
[INFO] [stdout]     |
[INFO] [stdout] 230 |     A1(B1), // --snip--
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    --> src/ch06.rs:226:10
[INFO] [stdout]     |
[INFO] [stdout] 226 | #[derive(Debug)]
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `B2`
[INFO] [stdout]    --> src/ch06.rs:235:5
[INFO] [stdout]     |
[INFO] [stdout] 235 |     B2,
[INFO] [stdout]     |     ^^
[INFO] [stdout]     |
[INFO] [stdout] note: `B1` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    --> src/ch06.rs:233:10
[INFO] [stdout]     |
[INFO] [stdout] 233 | #[derive(Debug)]
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `B3`
[INFO] [stdout]    --> src/ch06.rs:236:5
[INFO] [stdout]     |
[INFO] [stdout] 236 |     B3,
[INFO] [stdout]     |     ^^
[INFO] [stdout]     |
[INFO] [stdout] note: `B1` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    --> src/ch06.rs:233:10
[INFO] [stdout]     |
[INFO] [stdout] 233 | #[derive(Debug)]
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Coin`
[INFO] [stdout]    --> src/ch06.rs:240:6
[INFO] [stdout]     |
[INFO] [stdout] 240 | enum Coin {
[INFO] [stdout]     |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch06_03_if_let`
[INFO] [stdout]    --> src/ch06.rs:248:8
[INFO] [stdout]     |
[INFO] [stdout] 248 | pub fn ch06_03_if_let() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch06_03_matches`
[INFO] [stdout]    --> src/ch06.rs:292:8
[INFO] [stdout]     |
[INFO] [stdout] 292 | pub fn ch06_03_matches() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/ch07/mod.rs:79:8
[INFO] [stdout]    |
[INFO] [stdout] 79 | pub fn main() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch08_03_hash_maps`
[INFO] [stdout]   --> src/ch08_hashmap.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn ch08_03_hash_maps() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch08_02_strings`
[INFO] [stdout]   --> src/ch08_string.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn ch08_02_strings() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch08_01_vectors`
[INFO] [stdout]   --> src/ch08_vec.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn ch08_01_vectors() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch09_01_unrecoverable_errors_with_panic`
[INFO] [stdout]   --> src/ch09.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn ch09_01_unrecoverable_errors_with_panic() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch09_02_recoverable_errors_with_result`
[INFO] [stdout]   --> src/ch09.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub fn ch09_02_recoverable_errors_with_result() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch09_03_to_panic_or_not_to_panic`
[INFO] [stdout]    --> src/ch09.rs:177:8
[INFO] [stdout]     |
[INFO] [stdout] 177 | pub fn ch09_03_to_panic_or_not_to_panic() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch10_00_generics`
[INFO] [stdout]  --> src/ch10.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn ch10_00_generics() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch10_01_syntax`
[INFO] [stdout]   --> src/ch10.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub fn ch10_01_syntax() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch10_02_traits`
[INFO] [stdout]    --> src/ch10.rs:159:8
[INFO] [stdout]     |
[INFO] [stdout] 159 | pub fn ch10_02_traits() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch10_03_lifetime_syntax`
[INFO] [stdout]    --> src/ch10.rs:626:8
[INFO] [stdout]     |
[INFO] [stdout] 626 | pub fn ch10_03_lifetime_syntax() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]    --> src/ch11_01.rs:133:5
[INFO] [stdout]     |
[INFO] [stdout] 133 |     value: i32,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_two`
[INFO] [stdout]   --> src/ch11_03.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn add_two(a: i32) -> i32 {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Config`
[INFO] [stdout]   --> src/ch12.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Config<'a> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/ch12.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn new(args: &[String]) -> Result<Config, &'static str> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `minigrep`
[INFO] [stdout]   --> src/ch12.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | pub fn minigrep() {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]   --> src/ch12.rs:61:4
[INFO] [stdout]    |
[INFO] [stdout] 61 | fn run(config: Config) -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch13_01_closures`
[INFO] [stdout]  --> src/ch13.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn ch13_01_closures() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch13_02_iterators`
[INFO] [stdout]    --> src/ch13.rs:224:8
[INFO] [stdout]     |
[INFO] [stdout] 224 | pub fn ch13_02_iterators() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch13_04_performance`
[INFO] [stdout]    --> src/ch13.rs:392:8
[INFO] [stdout]     |
[INFO] [stdout] 392 | pub fn ch13_04_performance(buffer: &mut [i32], coefficients: [i64; 12], qlp_shift: i16) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch14_01_release_profiles`
[INFO] [stdout]   --> src/ch14.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn ch14_01_release_profiles() {}
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch14_02_publishing_to_crates_io`
[INFO] [stdout]   --> src/ch14.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn ch14_02_publishing_to_crates_io() {}
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch15_01_box`
[INFO] [stdout]   --> src/ch15.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn ch15_01_box() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch15_02_deref`
[INFO] [stdout]   --> src/ch15.rs:89:8
[INFO] [stdout]    |
[INFO] [stdout] 89 | pub fn ch15_02_deref() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch15_03_drop`
[INFO] [stdout]    --> src/ch15.rs:182:8
[INFO] [stdout]     |
[INFO] [stdout] 182 | pub fn ch15_03_drop() {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `List`
[INFO] [stdout]    --> src/ch15.rs:247:6
[INFO] [stdout]     |
[INFO] [stdout] 247 | enum List {
[INFO] [stdout]     |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch15_04_rc`
[INFO] [stdout]    --> src/ch15.rs:252:8
[INFO] [stdout]     |
[INFO] [stdout] 252 | pub fn ch15_04_rc() {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cons`
[INFO] [stdout]   --> src/ch15_02.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_02.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nil`
[INFO] [stdout]   --> src/ch15_02.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     Nil,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_02.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/ch15_02.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn main() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cons`
[INFO] [stdout]   --> src/ch15_03.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_03.rs:11:10
[INFO] [stdout]    |
[INFO] [stdout] 11 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nil`
[INFO] [stdout]   --> src/ch15_03.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     Nil,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_03.rs:11:10
[INFO] [stdout]    |
[INFO] [stdout] 11 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]   --> src/ch15_03.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/ch15_03.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub fn main() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]   --> src/ch15_04.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     value: i32,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_04.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `parent`
[INFO] [stdout]   --> src/ch15_04.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     parent: RefCell<Weak<Node>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_04.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `children`
[INFO] [stdout]   --> src/ch15_04.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/ch15_04.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/ch15_04.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn main() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch16_01_threads`
[INFO] [stdout]   --> src/ch16.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn ch16_01_threads() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch16_02_message_passing`
[INFO] [stdout]   --> src/ch16.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | pub fn ch16_02_message_passing() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch16_03_shared_state`
[INFO] [stdout]    --> src/ch16.rs:140:8
[INFO] [stdout]     |
[INFO] [stdout] 140 | pub fn ch16_03_shared_state() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch16_04_extensible_concurrency_sync_and_send`
[INFO] [stdout]    --> src/ch16.rs:218:8
[INFO] [stdout]     |
[INFO] [stdout] 218 | pub fn ch16_04_extensible_concurrency_sync_and_send() {}
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch17_01whatis_oo`
[INFO] [stdout]  --> src/ch17.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn ch17_01whatis_oo() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch17_02_trait_objects`
[INFO] [stdout]   --> src/ch17.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub fn ch17_02_trait_objects() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch17_03_oo_design_patterns`
[INFO] [stdout]    --> src/ch17.rs:226:8
[INFO] [stdout]     |
[INFO] [stdout] 226 | pub fn ch17_03_oo_design_patterns() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch18_01_all_the_places_for_patterns`
[INFO] [stdout]  --> src/ch18.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn ch18_01_all_the_places_for_patterns() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch18_02_refutability`
[INFO] [stdout]   --> src/ch18.rs:95:8
[INFO] [stdout]    |
[INFO] [stdout] 95 | pub fn ch18_02_refutability() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch18_03_pattern_syntax`
[INFO] [stdout]    --> src/ch18.rs:104:8
[INFO] [stdout]     |
[INFO] [stdout] 104 | pub fn ch18_03_pattern_syntax() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch19_01_unsafe_rust`
[INFO] [stdout]  --> src/ch19.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn ch19_01_unsafe_rust() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch19_03_advanced_traits`
[INFO] [stdout]    --> src/ch19.rs:213:8
[INFO] [stdout]     |
[INFO] [stdout] 213 | pub fn ch19_03_advanced_traits() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch19_04_advanced_types`
[INFO] [stdout]    --> src/ch19.rs:475:8
[INFO] [stdout]     |
[INFO] [stdout] 475 | pub fn ch19_04_advanced_types() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ch19_05_advanced_functions_and_closures`
[INFO] [stdout]    --> src/ch19.rs:661:8
[INFO] [stdout]     |
[INFO] [stdout] 661 | pub fn ch19_05_advanced_functions_and_closures() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/ch19_06.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch20.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `handle_connection`
[INFO] [stdout]   --> src/ch20.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn handle_connection(mut stream: TcpStream) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `breathe_in`
[INFO] [stdout]   --> src/ch07/mod.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn breathe_in() {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Vegetable`
[INFO] [stdout]   --> src/ch07/mod.rs:26:16
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub struct Vegetable {
[INFO] [stdout]    |                ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/ch07/mod.rs:32:16
[INFO] [stdout]    |
[INFO] [stdout] 32 |         pub fn new(name: &str) -> Vegetable {
[INFO] [stdout]    |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `generate_struct`
[INFO] [stdout]   --> src/ch07/mod.rs:40:12
[INFO] [stdout]    |
[INFO] [stdout] 40 |     pub fn generate_struct() -> Vegetable {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Appetizer`
[INFO] [stdout]   --> src/ch07/mod.rs:50:14
[INFO] [stdout]    |
[INFO] [stdout] 50 |     pub enum Appetizer {
[INFO] [stdout]    |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet_trio`
[INFO] [stdout]   --> src/ch07/mod.rs:63:12
[INFO] [stdout]    |
[INFO] [stdout] 63 |     pub fn clarinet_trio() {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet_trio`
[INFO] [stdout]    --> src/ch07/mod.rs:160:20
[INFO] [stdout]     |
[INFO] [stdout] 160 |             pub fn clarinet_trio() {
[INFO] [stdout]     |                    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet`
[INFO] [stdout]  --> src/ch07/mod.rs:7:16
[INFO] [stdout]   |
[INFO] [stdout] 7 |         pub fn clarinet() {
[INFO] [stdout]   |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet`
[INFO] [stdout]  --> src/ch07/sound1.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 |     pub fn clarinet() {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet`
[INFO] [stdout]  --> src/ch07/sound2/instrument.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn clarinet() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet`
[INFO] [stdout]  --> src/ch07/sound3/instrument.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn clarinet() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `clarinet`
[INFO] [stdout]    --> src/ch07/mod.rs:150:24
[INFO] [stdout]     |
[INFO] [stdout] 150 |                 pub fn clarinet() {
[INFO] [stdout]     |                        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: cannot test inner items
[INFO] [stdout]    --> src/ch13.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |         #[test]
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unnameable_test_items)]` on by default
[INFO] [stdout]     = note: this warning originates in the attribute macro `test` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `changeColorMessage` should have a snake case name
[INFO] [stdout]   --> src/ch06.rs:87:13
[INFO] [stdout]    |
[INFO] [stdout] 87 |         let changeColorMessage = ChangeColorMessage(1, 1, 1);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `change_color_message`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Filter` that must be used
[INFO] [stdout]    --> src/ch06.rs:299:5
[INFO] [stdout]     |
[INFO] [stdout] 299 |     v.iter().filter(|x| matches!(x, MyEnum::Foo));
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: iterators are lazy and do nothing unless consumed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Float` should have a snake case name
[INFO] [stdout]    --> src/ch08_vec.rs:126:13
[INFO] [stdout]     |
[INFO] [stdout] 126 |             Float => (),
[INFO] [stdout]     |             ^^^^^ help: convert the identifier to snake case (notice the capitalization): `float`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Text` should have a snake case name
[INFO] [stdout]    --> src/ch08_vec.rs:127:13
[INFO] [stdout]     |
[INFO] [stdout] 127 |             Text => (),
[INFO] [stdout]     |             ^^^^ help: convert the identifier to snake case: `text`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Int` should have a snake case name
[INFO] [stdout]    --> src/ch08_vec.rs:128:13
[INFO] [stdout]     |
[INFO] [stdout] 128 |             Int => (),
[INFO] [stdout]     |             ^^^ help: convert the identifier to snake case (notice the capitalization): `int`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Value` should have a snake case name
[INFO] [stdout]   --> src/ch17.rs:18:22
[INFO] [stdout]    |
[INFO] [stdout] 18 |                 Some(Value) => {
[INFO] [stdout]    |                      ^^^^^ help: convert the identifier to snake case (notice the capitalization): `value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 169 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 3.74s
[INFO] running `Command { std: "docker" "inspect" "72834a4048b93b78f0ed81585846fb1192576ffd50a5372ccdb08713d66cf946", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "72834a4048b93b78f0ed81585846fb1192576ffd50a5372ccdb08713d66cf946", kill_on_drop: false }`
[INFO] [stdout] 72834a4048b93b78f0ed81585846fb1192576ffd50a5372ccdb08713d66cf946
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] b796e1f34eeeb278c4f1c7da23926f38dbd68077133c035ed3a002b88555f001
[INFO] running `Command { std: "docker" "start" "-a" "b796e1f34eeeb278c4f1c7da23926f38dbd68077133c035ed3a002b88555f001", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: crate `threadPool` should have a snake case name
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr]   = help: convert the identifier to snake case: `thread_pool`
[INFO] [stderr] 
[INFO] [stderr] warning: `threadPool` (lib) generated 1 warning
[INFO] [stderr] warning: the item `hosting` is imported redundantly
[INFO] [stderr]    --> src/lib.rs:93:9
[INFO] [stderr]     |
[INFO] [stderr] 93  |     use crate::front_of_house::hosting;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 122 | pub use crate::front_of_house::hosting;
[INFO] [stderr]     |         ------------------------------ the item `hosting` is already imported here
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fmt`
[INFO] [stderr]    --> src/lib.rs:104:5
[INFO] [stderr]     |
[INFO] [stderr] 104 | use std::fmt;
[INFO] [stderr]     |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Result as IoResult`
[INFO] [stderr]    --> src/lib.rs:114:5
[INFO] [stderr]     |
[INFO] [stderr] 114 | use std::io::Result as IoResult;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `borrow`, `cmp::Ordering`
[INFO] [stderr]    --> src/lib.rs:128:11
[INFO] [stderr]     |
[INFO] [stderr] 128 | use std::{borrow, cmp::Ordering};
[INFO] [stderr]     |           ^^^^^^  ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Write`, `self`
[INFO] [stderr]    --> src/lib.rs:132:15
[INFO] [stderr]     |
[INFO] [stderr] 132 | use std::io::{self, Write}; // use io 本身 和 io::Write
[INFO] [stderr]     |               ^^^^  ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::*`
[INFO] [stderr]    --> src/lib.rs:135:5
[INFO] [stderr]     |
[INFO] [stderr] 135 | use std::collections::*;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::process`
[INFO] [stderr]    --> src/lib.rs:141:5
[INFO] [stderr]     |
[INFO] [stderr] 141 | use std::process;
[INFO] [stderr]     |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `order1`
[INFO] [stderr]   --> src/lib.rs:96:13
[INFO] [stderr]    |
[INFO] [stderr] 96 |         let order1 = back_of_house::Appetizer::Soup;
[INFO] [stderr]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order1`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `order2`
[INFO] [stderr]   --> src/lib.rs:97:13
[INFO] [stderr]    |
[INFO] [stderr] 97 |         let order2 = back_of_house::Appetizer::Salad;
[INFO] [stderr]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c1`
[INFO] [stderr]    --> src/lib.rs:311:16
[INFO] [stderr]     |
[INFO] [stderr] 311 |     pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor {
[INFO] [stderr]     |                ^^ help: if this is intentional, prefix it with an underscore: `_c1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c2`
[INFO] [stderr]    --> src/lib.rs:311:34
[INFO] [stderr]     |
[INFO] [stderr] 311 |     pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor {
[INFO] [stderr]     |                                  ^^ help: if this is intentional, prefix it with an underscore: `_c2`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `serve_order`
[INFO] [stderr]   --> src/lib.rs:21:4
[INFO] [stderr]    |
[INFO] [stderr] 21 | fn serve_order() {}
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/lib.rs:23:4
[INFO] [stderr]    |
[INFO] [stderr] 23 | fn main() {}
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `eat_at_restaurant`
[INFO] [stderr]   --> src/lib.rs:95:12
[INFO] [stderr]    |
[INFO] [stderr] 95 |     pub fn eat_at_restaurant() {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fix_incorrect_order`
[INFO] [stderr]   --> src/lib.rs:27:8
[INFO] [stderr]    |
[INFO] [stderr] 27 |     fn fix_incorrect_order() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `cook_order`
[INFO] [stderr]   --> src/lib.rs:33:8
[INFO] [stderr]    |
[INFO] [stderr] 33 |     fn cook_order() {}
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `seasonal_fruit`
[INFO] [stderr]   --> src/lib.rs:42:9
[INFO] [stderr]    |
[INFO] [stderr] 42 |         seasonal_fruit: String,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Appetizer`
[INFO] [stderr]   --> src/lib.rs:55:14
[INFO] [stderr]    |
[INFO] [stderr] 55 |     pub enum Appetizer {
[INFO] [stderr]    |              ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `the_rust_programming_language` (lib) generated 18 warnings
[INFO] [stderr] warning: `the_rust_programming_language` (lib test) generated 17 warnings (17 duplicates)
[INFO] [stderr] warning: function is never used: `test2`
[INFO] [stderr]   --> tests/integration_test.rs:38:4
[INFO] [stderr]    |
[INFO] [stderr] 38 | fn test2() {
[INFO] [stderr]    |    ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]   --> src/ch02.rs:17:54
[INFO] [stderr]    |
[INFO] [stderr] 17 |     let secret_number = rand::thread_rng().gen_range((1..=100)); // 这个也能运行
[INFO] [stderr]    |                                                      ^       ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 17 -     let secret_number = rand::thread_rng().gen_range((1..=100)); // 这个也能运行
[INFO] [stderr] 17 +     let secret_number = rand::thread_rng().gen_range(1..=100); // 这个也能运行
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]  --> src/ch03.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 |     /** 基本类型 */
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 7 |     // 直接的赋值能够直接推断出值的类型
[INFO] [stderr] 8 |     let a = 1; // 默认为 i32
[INFO] [stderr]   |     ---------- rustdoc does not generate documentation for statements
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr]   = help: use `/* */` for a plain comment
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/ch03.rs:80:5
[INFO] [stderr]    |
[INFO] [stderr] 80 |     /** 复合类型 */
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 83 |     let _tup1: (i32, f64, u8) = (500, 6.4, 1); // 可以设置多种类型
[INFO] [stderr]    |     ------------------------------------------ rustdoc does not generate documentation for statements
[INFO] [stderr]    |
[INFO] [stderr]    = help: use `/* */` for a plain comment
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]    --> src/ch03.rs:154:5
[INFO] [stderr]     |
[INFO] [stderr] 154 |     /// 方法只要在作用域中声明 就能够调用(不用先声明在前)
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 155 |     fun_1();
[INFO] [stderr]     |     ------- rustdoc does not generate documentation for expressions
[INFO] [stderr]     |
[INFO] [stderr]     = help: use `//` for a plain comment
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::any::Any`
[INFO] [stderr]  --> src/ch07/mod.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |     use std::any::Any;
[INFO] [stderr]   |         ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::HashMap`
[INFO] [stderr]    --> src/ch07/mod.rs:118:9
[INFO] [stderr]     |
[INFO] [stderr] 118 |     use std::collections::HashMap; // 引入HashMap 的习惯用法 而不是 use std::collections; 在使用 collections::HashMap
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fmt::Result`
[INFO] [stderr]    --> src/ch07/mod.rs:139:13
[INFO] [stderr]     |
[INFO] [stderr] 139 |         use std::fmt::Result;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Result as IoResult`
[INFO] [stderr]    --> src/ch07/mod.rs:140:13
[INFO] [stderr]     |
[INFO] [stderr] 140 |         use std::io::Result as IoResult;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/ch07/mod.rs:174:58
[INFO] [stderr]     |
[INFO] [stderr] 174 |         let secret_number = rand::thread_rng().gen_range((1..100));
[INFO] [stderr]     |                                                          ^      ^
[INFO] [stderr]     |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr] 174 -         let secret_number = rand::thread_rng().gen_range((1..100));
[INFO] [stderr] 174 +         let secret_number = rand::thread_rng().gen_range(1..100);
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]    --> src/ch07/mod.rs:175:58
[INFO] [stderr]     |
[INFO] [stderr] 175 |         let secret_number = rand::thread_rng().gen_range((1..=100));
[INFO] [stderr]     |                                                          ^       ^
[INFO] [stderr]     |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr] 175 -         let secret_number = rand::thread_rng().gen_range((1..=100));
[INFO] [stderr] 175 +         let secret_number = rand::thread_rng().gen_range(1..=100);
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp::Ordering`
[INFO] [stderr]    --> src/ch07/mod.rs:182:13
[INFO] [stderr]     |
[INFO] [stderr] 182 |         use std::cmp::Ordering;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]    --> src/ch07/mod.rs:183:13
[INFO] [stderr]     |
[INFO] [stderr] 183 |         use std::io;
[INFO] [stderr]     |             ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `cmp::Ordering`, `io`
[INFO] [stderr]    --> src/ch07/mod.rs:187:19
[INFO] [stderr]     |
[INFO] [stderr] 187 |         use std::{cmp::Ordering, io};
[INFO] [stderr]     |                   ^^^^^^^^^^^^^  ^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]    --> src/ch07/mod.rs:192:13
[INFO] [stderr]     |
[INFO] [stderr] 192 |         use std::io;
[INFO] [stderr]     |             ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Write`
[INFO] [stderr]    --> src/ch07/mod.rs:193:13
[INFO] [stderr]     |
[INFO] [stderr] 193 |         use std::io::Write;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Write`, `self`
[INFO] [stderr]    --> src/ch07/mod.rs:197:23
[INFO] [stderr]     |
[INFO] [stderr] 197 |         use std::io::{self, Write};
[INFO] [stderr]     |                       ^^^^  ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::*`
[INFO] [stderr]    --> src/ch07/mod.rs:203:13
[INFO] [stderr]     |
[INFO] [stderr] 203 |         use std::collections::*;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `File`, `self`
[INFO] [stderr]  --> src/ch08_hashmap.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fs::{self, File};
[INFO] [stderr]   |               ^^^^  ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/ch08_hashmap.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::ErrorKind`
[INFO] [stderr]  --> src/ch08_hashmap.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::io::ErrorKind;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Read`
[INFO] [stderr]  --> src/ch08_hashmap.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::io::Read;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::ops::Add`
[INFO] [stderr]  --> src/ch08_hashmap.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::ops::Add;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `HashMap` is imported redundantly
[INFO] [stderr]   --> src/ch08_hashmap.rs:17:13
[INFO] [stderr]    |
[INFO] [stderr] 3  | use std::collections::*;
[INFO] [stderr]    |     ------------------- the item `HashMap` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 17 |         use std::collections::HashMap;
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::*`
[INFO] [stderr]  --> src/ch08_string.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::collections::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `File`, `self`
[INFO] [stderr]  --> src/ch08_string.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fs::{self, File};
[INFO] [stderr]   |               ^^^^  ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/ch08_string.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::ErrorKind`
[INFO] [stderr]  --> src/ch08_string.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::io::ErrorKind;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::*`
[INFO] [stderr]  --> src/ch08_vec.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::collections::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `File`, `self`
[INFO] [stderr]  --> src/ch08_vec.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fs::{self, File};
[INFO] [stderr]   |               ^^^^  ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/ch08_vec.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::ErrorKind`
[INFO] [stderr]  --> src/ch08_vec.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::io::ErrorKind;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Read`
[INFO] [stderr]  --> src/ch08_vec.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::io::Read;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::ops::Add`
[INFO] [stderr]  --> src/ch08_vec.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::ops::Add;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `io` is imported redundantly
[INFO] [stderr]    --> src/ch08_vec.rs:276:23
[INFO] [stderr]     |
[INFO] [stderr] 5   | use std::io;
[INFO] [stderr]     |     ------- the item `io` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 276 |         use std::io::{self, Write};
[INFO] [stderr]     |                       ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]    --> src/ch08_vec.rs:329:5
[INFO] [stderr]     |
[INFO] [stderr] 329 | /     /// ```
[INFO] [stderr] 330 | |     /// pub fn dedup_by_key<F, K>(&mut self, key: F)
[INFO] [stderr] 331 | |     /// where
[INFO] [stderr] 332 | |     ///     F: FnMut(&mut T) -> K,
[INFO] [stderr] 333 | |     ///     K: PartialEq<K>,
[INFO] [stderr] 334 | |     /// ```
[INFO] [stderr] 335 | |     /// 移除vec中 调用F方法后 相同返回值中的多余一个的其他元素
[INFO] [stderr]     | |______________________________________________________________^
[INFO] [stderr] 336 | /     {
[INFO] [stderr] 337 | |         let mut vec = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];
[INFO] [stderr] 338 | |
[INFO] [stderr] 339 | |         vec.dedup_by_key(|i| *i / 10);
[INFO] [stderr] ...   |
[INFO] [stderr] 344 | |         assert_eq!(vec, [1, 10]);
[INFO] [stderr] 345 | |     }
[INFO] [stderr]     | |_____- rustdoc does not generate documentation for expressions
[INFO] [stderr]     |
[INFO] [stderr]     = help: use `//` for a plain comment
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::HashMap`
[INFO] [stderr]  --> src/ch09.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::collections::HashMap;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::future::Future`
[INFO] [stderr]  --> src/ch09.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::future::Future;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Ref`
[INFO] [stderr]  --> src/ch15_04.rs:1:17
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::cell::{Ref, RefCell};
[INFO] [stderr]   |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::ptr::read_volatile`
[INFO] [stderr]   --> src/ch16.rs:47:5
[INFO] [stderr]    |
[INFO] [stderr] 47 | use std::ptr::read_volatile;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::rc::Rc`
[INFO] [stderr]   --> src/ch16.rs:48:5
[INFO] [stderr]    |
[INFO] [stderr] 48 | use std::rc::Rc;
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `mpsc` is imported redundantly
[INFO] [stderr]   --> src/ch16.rs:79:13
[INFO] [stderr]    |
[INFO] [stderr] 49 | use std::sync::{mpsc, Arc};
[INFO] [stderr]    |                 ---- the item `mpsc` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 79 |         use std::sync::mpsc;
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `thread` is imported redundantly
[INFO] [stderr]   --> src/ch16.rs:80:13
[INFO] [stderr]    |
[INFO] [stderr] 1  | use std::thread;
[INFO] [stderr]    |     ----------- the item `thread` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 80 |         use std::thread;
[INFO] [stderr]    |             ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `Duration` is imported redundantly
[INFO] [stderr]   --> src/ch16.rs:81:13
[INFO] [stderr]    |
[INFO] [stderr] 2  | use std::time::Duration;
[INFO] [stderr]    |     ------------------- the item `Duration` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 81 |         use std::time::Duration;
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::rc::Rc`
[INFO] [stderr]  --> src/ch17.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::rc::Rc;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::panic::RefUnwindSafe`
[INFO] [stderr]  --> src/ch19.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::panic::RefUnwindSafe;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `slice` is imported redundantly
[INFO] [stderr]    --> src/ch19.rs:117:17
[INFO] [stderr]     |
[INFO] [stderr] 92  |         use std::slice;
[INFO] [stderr]     |             ---------- the item `slice` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 117 |             use std::slice;
[INFO] [stderr]     |                 ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `Add` is imported redundantly
[INFO] [stderr]    --> src/ch19.rs:310:17
[INFO] [stderr]     |
[INFO] [stderr] 277 |         use std::ops::Add;
[INFO] [stderr]     |             ------------- the item `Add` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 310 |             use std::ops::Add;
[INFO] [stderr]     |                 ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fmt`
[INFO] [stderr]    --> src/ch19.rs:507:13
[INFO] [stderr]     |
[INFO] [stderr] 507 |         use std::fmt;
[INFO] [stderr]     |             ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Error`
[INFO] [stderr]    --> src/ch19.rs:508:13
[INFO] [stderr]     |
[INFO] [stderr] 508 |         use std::io::Error;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `self::proc_macro::TokenStream`
[INFO] [stderr]   --> src/ch19_06.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 | use self::proc_macro::TokenStream;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `quote::quote`
[INFO] [stderr]   --> src/ch19_06.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 | use quote::quote;
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `syn`
[INFO] [stderr]   --> src/ch19_06.rs:28:5
[INFO] [stderr]    |
[INFO] [stderr] 28 | use syn;
[INFO] [stderr]    |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `hex::hex`
[INFO] [stderr]   --> src/main.rs:58:5
[INFO] [stderr]    |
[INFO] [stderr] 58 | use hex::hex;
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `RefCell`, `Ref`
[INFO] [stderr]   --> src/main.rs:61:17
[INFO] [stderr]    |
[INFO] [stderr] 61 | use std::cell::{Ref, RefCell};
[INFO] [stderr]    |                 ^^^  ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Write`
[INFO] [stderr]   --> src/main.rs:62:5
[INFO] [stderr]    |
[INFO] [stderr] 62 | use std::io::Write;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::rc::Rc`
[INFO] [stderr]   --> src/main.rs:63:5
[INFO] [stderr]    |
[INFO] [stderr] 63 | use std::rc::Rc;
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `the_rust_programming_language::Config`
[INFO] [stderr]   --> src/main.rs:64:5
[INFO] [stderr]    |
[INFO] [stderr] 64 | use the_rust_programming_language::Config;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Read`
[INFO] [stderr]  --> src/ch08_string.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::io::Read;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable pattern
[INFO] [stderr]    --> src/ch08_vec.rs:127:13
[INFO] [stderr]     |
[INFO] [stderr] 126 |             Float => (),
[INFO] [stderr]     |             ----- matches any value
[INFO] [stderr] 127 |             Text => (),
[INFO] [stderr]     |             ^^^^ unreachable pattern
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable pattern
[INFO] [stderr]    --> src/ch08_vec.rs:128:13
[INFO] [stderr]     |
[INFO] [stderr] 126 |             Float => (),
[INFO] [stderr]     |             ----- matches any value
[INFO] [stderr] 127 |             Text => (),
[INFO] [stderr] 128 |             Int => (),
[INFO] [stderr]     |             ^^^ unreachable pattern
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `a` is never read
[INFO] [stderr]    --> src/ch03.rs:123:5
[INFO] [stderr]     |
[INFO] [stderr] 123 |     a = [1, 2, 3, 4, 5];
[INFO] [stderr]     |     ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `count` is never read
[INFO] [stderr]    --> src/ch06.rs:276:18
[INFO] [stderr]     |
[INFO] [stderr] 276 |             _ => count += 1,
[INFO] [stderr]     |                  ^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `count` is never read
[INFO] [stderr]    --> src/ch06.rs:286:13
[INFO] [stderr]     |
[INFO] [stderr] 286 |             count += 1;
[INFO] [stderr]     |             ^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `result` is never read
[INFO] [stderr]    --> src/ch10.rs:688:13
[INFO] [stderr]     |
[INFO] [stderr] 688 |             result = longest(string1.as_str(), string2.as_str());
[INFO] [stderr]     |             ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/ch04.rs:211:13
[INFO] [stderr]     |
[INFO] [stderr] 211 |         let mut s = String::from("hello");
[INFO] [stderr]     |             ----^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/ch04.rs:298:13
[INFO] [stderr]     |
[INFO] [stderr] 298 |         let mut s = String::from("hello world");
[INFO] [stderr]     |             ----^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ch08_string.rs:20:13
[INFO] [stderr]    |
[INFO] [stderr] 20 |         let mut a = String::new(); // 使用类似Vector 的方法 新建一个空的字符串
[INFO] [stderr]    |             ----^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ch08_string.rs:59:13
[INFO] [stderr]    |
[INFO] [stderr] 59 |         let mut s3 = s1 + &s2 + &s4; // 注意 s1 被移动了，不能继续使用 s2 s3 可以继续使用
[INFO] [stderr]    |             ----^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ch08_string.rs:60:13
[INFO] [stderr]    |
[INFO] [stderr] 60 |         let mut t3 = String::from("") + &s2 + &s3;
[INFO] [stderr]    |             ----^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/ch10.rs:842:13
[INFO] [stderr]     |
[INFO] [stderr] 842 |         let mut s: &'static str = "I have a static lifetime.";
[INFO] [stderr]     |             ----^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: function cannot return without recursing
[INFO] [stderr]   --> src/ch18.rs:85:9
[INFO] [stderr]    |
[INFO] [stderr] 85 |         fn print_coordinates(&(x, y): &(i32, i32)) {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stderr] ...
[INFO] [stderr] 89 |             print_coordinates(&point);
[INFO] [stderr]    |             ------------------------- recursive call site
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stderr]    = help: a `loop` may express intention better if this is on purpose
[INFO] [stderr] 
[INFO] [stderr] warning: private type `ch10_02_traits::Point<T, S>` in public interface (error E0446)
[INFO] [stderr]    --> src/ch10.rs:220:13
[INFO] [stderr]     |
[INFO] [stderr] 220 |             fn summarize1(&self) -> Point<T, S>;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(private_in_public)]` on by default
[INFO] [stderr]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]     = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
[INFO] [stderr] 
[INFO] [stderr] warning: private type `ch10_02_traits::Point<i32, f64>` in public interface (error E0446)
[INFO] [stderr]    --> src/ch10.rs:238:13
[INFO] [stderr]     |
[INFO] [stderr] 238 |             fn summarize1(&self) -> Point<i32, f64> {
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]     = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/ch01.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn main() {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch02_00_guessing_game_tutorial`
[INFO] [stderr]   --> src/ch02.rs:10:8
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub fn ch02_00_guessing_game_tutorial() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch03_02_data_types`
[INFO] [stderr]  --> src/ch03.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn ch03_02_data_types() {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch03_03_how_functions_work`
[INFO] [stderr]    --> src/ch03.rs:135:8
[INFO] [stderr]     |
[INFO] [stderr] 135 | pub fn ch03_03_how_functions_work() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch03_05_control_flow`
[INFO] [stderr]    --> src/ch03.rs:181:8
[INFO] [stderr]     |
[INFO] [stderr] 181 | pub fn ch03_05_control_flow() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fun_2`
[INFO] [stderr]    --> src/ch03.rs:257:4
[INFO] [stderr]     |
[INFO] [stderr] 257 | fn fun_2() {}
[INFO] [stderr]     |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch04_01_what_is_ownership`
[INFO] [stderr]   --> src/ch04.rs:21:8
[INFO] [stderr]    |
[INFO] [stderr] 21 | pub fn ch04_01_what_is_ownership() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch04_02_references_and_borrowing`
[INFO] [stderr]    --> src/ch04.rs:139:8
[INFO] [stderr]     |
[INFO] [stderr] 139 | pub fn ch04_02_references_and_borrowing() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch04_03_slices`
[INFO] [stderr]    --> src/ch04.rs:238:8
[INFO] [stderr]     |
[INFO] [stderr] 238 | pub fn ch04_03_slices() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch05_01_defining_structs`
[INFO] [stderr]  --> src/ch05.rs:3:8
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub fn ch05_01_defining_structs() {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch05_02_example_structs`
[INFO] [stderr]    --> src/ch05.rs:155:8
[INFO] [stderr]     |
[INFO] [stderr] 155 | pub fn ch05_02_example_structs() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch05_03_method_syntax`
[INFO] [stderr]    --> src/ch05.rs:224:8
[INFO] [stderr]     |
[INFO] [stderr] 224 | pub fn ch05_03_method_syntax() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch06_01_defining_an_enum`
[INFO] [stderr]  --> src/ch06.rs:3:8
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub fn ch06_01_defining_an_enum() {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch06_02_match`
[INFO] [stderr]    --> src/ch06.rs:125:8
[INFO] [stderr]     |
[INFO] [stderr] 125 | pub fn ch06_02_match() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Alabama`
[INFO] [stderr]    --> src/ch06.rs:228:5
[INFO] [stderr]     |
[INFO] [stderr] 228 |     Alabama,
[INFO] [stderr]     |     ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr] note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]    --> src/ch06.rs:226:10
[INFO] [stderr]     |
[INFO] [stderr] 226 | #[derive(Debug)]
[INFO] [stderr]     |          ^^^^^
[INFO] [stderr]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Alaska`
[INFO] [stderr]    --> src/ch06.rs:229:5
[INFO] [stderr]     |
[INFO] [stderr] 229 |     Alaska,
[INFO] [stderr]     |     ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr] note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]    --> src/ch06.rs:226:10
[INFO] [stderr]     |
[INFO] [stderr] 226 | #[derive(Debug)]
[INFO] [stderr]     |          ^^^^^
[INFO] [stderr]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `A1`
[INFO] [stderr]    --> src/ch06.rs:230:5
[INFO] [stderr]     |
[INFO] [stderr] 230 |     A1(B1), // --snip--
[INFO] [stderr]     |     ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr] note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]    --> src/ch06.rs:226:10
[INFO] [stderr]     |
[INFO] [stderr] 226 | #[derive(Debug)]
[INFO] [stderr]     |          ^^^^^
[INFO] [stderr]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `B2`
[INFO] [stderr]    --> src/ch06.rs:235:5
[INFO] [stderr]     |
[INFO] [stderr] 235 |     B2,
[INFO] [stderr]     |     ^^
[INFO] [stderr]     |
[INFO] [stderr] note: `B1` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]    --> src/ch06.rs:233:10
[INFO] [stderr]     |
[INFO] [stderr] 233 | #[derive(Debug)]
[INFO] [stderr]     |          ^^^^^
[INFO] [stderr]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `B3`
[INFO] [stderr]    --> src/ch06.rs:236:5
[INFO] [stderr]     |
[INFO] [stderr] 236 |     B3,
[INFO] [stderr]     |     ^^
[INFO] [stderr]     |
[INFO] [stderr] note: `B1` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]    --> src/ch06.rs:233:10
[INFO] [stderr]     |
[INFO] [stderr] 233 | #[derive(Debug)]
[INFO] [stderr]     |          ^^^^^
[INFO] [stderr]     = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Coin`
[INFO] [stderr]    --> src/ch06.rs:240:6
[INFO] [stderr]     |
[INFO] [stderr] 240 | enum Coin {
[INFO] [stderr]     |      ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch06_03_if_let`
[INFO] [stderr]    --> src/ch06.rs:248:8
[INFO] [stderr]     |
[INFO] [stderr] 248 | pub fn ch06_03_if_let() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch06_03_matches`
[INFO] [stderr]    --> src/ch06.rs:292:8
[INFO] [stderr]     |
[INFO] [stderr] 292 | pub fn ch06_03_matches() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/ch07/mod.rs:79:8
[INFO] [stderr]    |
[INFO] [stderr] 79 | pub fn main() {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch08_03_hash_maps`
[INFO] [stderr]   --> src/ch08_hashmap.rs:10:8
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub fn ch08_03_hash_maps() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch08_02_strings`
[INFO] [stderr]   --> src/ch08_string.rs:10:8
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub fn ch08_02_strings() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch08_01_vectors`
[INFO] [stderr]   --> src/ch08_vec.rs:10:8
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub fn ch08_01_vectors() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch09_01_unrecoverable_errors_with_panic`
[INFO] [stderr]   --> src/ch09.rs:12:8
[INFO] [stderr]    |
[INFO] [stderr] 12 | pub fn ch09_01_unrecoverable_errors_with_panic() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch09_02_recoverable_errors_with_result`
[INFO] [stderr]   --> src/ch09.rs:31:8
[INFO] [stderr]    |
[INFO] [stderr] 31 | pub fn ch09_02_recoverable_errors_with_result() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch09_03_to_panic_or_not_to_panic`
[INFO] [stderr]    --> src/ch09.rs:177:8
[INFO] [stderr]     |
[INFO] [stderr] 177 | pub fn ch09_03_to_panic_or_not_to_panic() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch10_00_generics`
[INFO] [stderr]  --> src/ch10.rs:3:8
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub fn ch10_00_generics() {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch10_01_syntax`
[INFO] [stderr]   --> src/ch10.rs:32:8
[INFO] [stderr]    |
[INFO] [stderr] 32 | pub fn ch10_01_syntax() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch10_02_traits`
[INFO] [stderr]    --> src/ch10.rs:159:8
[INFO] [stderr]     |
[INFO] [stderr] 159 | pub fn ch10_02_traits() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch10_03_lifetime_syntax`
[INFO] [stderr]    --> src/ch10.rs:626:8
[INFO] [stderr]     |
[INFO] [stderr] 626 | pub fn ch10_03_lifetime_syntax() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `value`
[INFO] [stderr]    --> src/ch11_01.rs:133:5
[INFO] [stderr]     |
[INFO] [stderr] 133 |     value: i32,
[INFO] [stderr]     |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add_two`
[INFO] [stderr]   --> src/ch11_03.rs:17:8
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub fn add_two(a: i32) -> i32 {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Config`
[INFO] [stderr]   --> src/ch12.rs:20:8
[INFO] [stderr]    |
[INFO] [stderr] 20 | struct Config<'a> {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/ch12.rs:26:8
[INFO] [stderr]    |
[INFO] [stderr] 26 |     fn new(args: &[String]) -> Result<Config, &'static str> {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `minigrep`
[INFO] [stderr]   --> src/ch12.rs:38:8
[INFO] [stderr]    |
[INFO] [stderr] 38 | pub fn minigrep() {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `run`
[INFO] [stderr]   --> src/ch12.rs:61:4
[INFO] [stderr]    |
[INFO] [stderr] 61 | fn run(config: Config) -> Result<(), Box<dyn Error>> {
[INFO] [stderr]    |    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch13_01_closures`
[INFO] [stderr]  --> src/ch13.rs:9:8
[INFO] [stderr]   |
[INFO] [stderr] 9 | pub fn ch13_01_closures() {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch13_02_iterators`
[INFO] [stderr]    --> src/ch13.rs:224:8
[INFO] [stderr]     |
[INFO] [stderr] 224 | pub fn ch13_02_iterators() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch13_04_performance`
[INFO] [stderr]    --> src/ch13.rs:392:8
[INFO] [stderr]     |
[INFO] [stderr] 392 | pub fn ch13_04_performance(buffer: &mut [i32], coefficients: [i64; 12], qlp_shift: i16) {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch14_01_release_profiles`
[INFO] [stderr]   --> src/ch14.rs:22:4
[INFO] [stderr]    |
[INFO] [stderr] 22 | fn ch14_01_release_profiles() {}
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch14_02_publishing_to_crates_io`
[INFO] [stderr]   --> src/ch14.rs:27:4
[INFO] [stderr]    |
[INFO] [stderr] 27 | fn ch14_02_publishing_to_crates_io() {}
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch15_01_box`
[INFO] [stderr]   --> src/ch15.rs:34:4
[INFO] [stderr]    |
[INFO] [stderr] 34 | fn ch15_01_box() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch15_02_deref`
[INFO] [stderr]   --> src/ch15.rs:89:8
[INFO] [stderr]    |
[INFO] [stderr] 89 | pub fn ch15_02_deref() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch15_03_drop`
[INFO] [stderr]    --> src/ch15.rs:182:8
[INFO] [stderr]     |
[INFO] [stderr] 182 | pub fn ch15_03_drop() {
[INFO] [stderr]     |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `List`
[INFO] [stderr]    --> src/ch15.rs:247:6
[INFO] [stderr]     |
[INFO] [stderr] 247 | enum List {
[INFO] [stderr]     |      ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch15_04_rc`
[INFO] [stderr]    --> src/ch15.rs:252:8
[INFO] [stderr]     |
[INFO] [stderr] 252 | pub fn ch15_04_rc() {
[INFO] [stderr]     |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Cons`
[INFO] [stderr]   --> src/ch15_02.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/ch15_02.rs:8:10
[INFO] [stderr]    |
[INFO] [stderr] 8  | #[derive(Debug)]
[INFO] [stderr]    |          ^^^^^
[INFO] [stderr]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Nil`
[INFO] [stderr]   --> src/ch15_02.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     Nil,
[INFO] [stderr]    |     ^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/ch15_02.rs:8:10
[INFO] [stderr]    |
[INFO] [stderr] 8  | #[derive(Debug)]
[INFO] [stderr]    |          ^^^^^
[INFO] [stderr]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/ch15_02.rs:16:8
[INFO] [stderr]    |
[INFO] [stderr] 16 | pub fn main() {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Cons`
[INFO] [stderr]   --> src/ch15_03.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 |     Cons(i32, RefCell<Rc<List>>),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/ch15_03.rs:11:10
[INFO] [stderr]    |
[INFO] [stderr] 11 | #[derive(Debug)]
[INFO] [stderr]    |          ^^^^^
[INFO] [stderr]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Nil`
[INFO] [stderr]   --> src/ch15_03.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 |     Nil,
[INFO] [stderr]    |     ^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/ch15_03.rs:11:10
[INFO] [stderr]    |
[INFO] [stderr] 11 | #[derive(Debug)]
[INFO] [stderr]    |          ^^^^^
[INFO] [stderr]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `tail`
[INFO] [stderr]   --> src/ch15_03.rs:20:8
[INFO] [stderr]    |
[INFO] [stderr] 20 |     fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/ch15_03.rs:28:8
[INFO] [stderr]    |
[INFO] [stderr] 28 | pub fn main() {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `value`
[INFO] [stderr]   --> src/ch15_04.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     value: i32,
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/ch15_04.rs:21:10
[INFO] [stderr]    |
[INFO] [stderr] 21 | #[derive(Debug)]
[INFO] [stderr]    |          ^^^^^
[INFO] [stderr]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `parent`
[INFO] [stderr]   --> src/ch15_04.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 |     parent: RefCell<Weak<Node>>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/ch15_04.rs:21:10
[INFO] [stderr]    |
[INFO] [stderr] 21 | #[derive(Debug)]
[INFO] [stderr]    |          ^^^^^
[INFO] [stderr]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `children`
[INFO] [stderr]   --> src/ch15_04.rs:27:5
[INFO] [stderr]    |
[INFO] [stderr] 27 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/ch15_04.rs:21:10
[INFO] [stderr]    |
[INFO] [stderr] 21 | #[derive(Debug)]
[INFO] [stderr]    |          ^^^^^
[INFO] [stderr]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/ch15_04.rs:30:8
[INFO] [stderr]    |
[INFO] [stderr] 30 | pub fn main() {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch16_01_threads`
[INFO] [stderr]   --> src/ch16.rs:16:8
[INFO] [stderr]    |
[INFO] [stderr] 16 | pub fn ch16_01_threads() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch16_02_message_passing`
[INFO] [stderr]   --> src/ch16.rs:52:8
[INFO] [stderr]    |
[INFO] [stderr] 52 | pub fn ch16_02_message_passing() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch16_03_shared_state`
[INFO] [stderr]    --> src/ch16.rs:140:8
[INFO] [stderr]     |
[INFO] [stderr] 140 | pub fn ch16_03_shared_state() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch16_04_extensible_concurrency_sync_and_send`
[INFO] [stderr]    --> src/ch16.rs:218:8
[INFO] [stderr]     |
[INFO] [stderr] 218 | pub fn ch16_04_extensible_concurrency_sync_and_send() {}
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch17_01whatis_oo`
[INFO] [stderr]  --> src/ch17.rs:3:8
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub fn ch17_01whatis_oo() {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch17_02_trait_objects`
[INFO] [stderr]   --> src/ch17.rs:37:8
[INFO] [stderr]    |
[INFO] [stderr] 37 | pub fn ch17_02_trait_objects() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch17_03_oo_design_patterns`
[INFO] [stderr]    --> src/ch17.rs:226:8
[INFO] [stderr]     |
[INFO] [stderr] 226 | pub fn ch17_03_oo_design_patterns() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch18_01_all_the_places_for_patterns`
[INFO] [stderr]  --> src/ch18.rs:2:8
[INFO] [stderr]   |
[INFO] [stderr] 2 | pub fn ch18_01_all_the_places_for_patterns() {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch18_02_refutability`
[INFO] [stderr]   --> src/ch18.rs:95:8
[INFO] [stderr]    |
[INFO] [stderr] 95 | pub fn ch18_02_refutability() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch18_03_pattern_syntax`
[INFO] [stderr]    --> src/ch18.rs:104:8
[INFO] [stderr]     |
[INFO] [stderr] 104 | pub fn ch18_03_pattern_syntax() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch19_01_unsafe_rust`
[INFO] [stderr]  --> src/ch19.rs:6:8
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn ch19_01_unsafe_rust() {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch19_03_advanced_traits`
[INFO] [stderr]    --> src/ch19.rs:213:8
[INFO] [stderr]     |
[INFO] [stderr] 213 | pub fn ch19_03_advanced_traits() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch19_04_advanced_types`
[INFO] [stderr]    --> src/ch19.rs:475:8
[INFO] [stderr]     |
[INFO] [stderr] 475 | pub fn ch19_04_advanced_types() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ch19_05_advanced_functions_and_closures`
[INFO] [stderr]    --> src/ch19.rs:661:8
[INFO] [stderr]     |
[INFO] [stderr] 661 | pub fn ch19_05_advanced_functions_and_closures() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/ch19_06.rs:35:4
[INFO] [stderr]    |
[INFO] [stderr] 35 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/ch20.rs:7:8
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub fn main() {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `handle_connection`
[INFO] [stderr]   --> src/ch20.rs:19:4
[INFO] [stderr]    |
[INFO] [stderr] 19 | fn handle_connection(mut stream: TcpStream) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `breathe_in`
[INFO] [stderr]   --> src/ch07/mod.rs:14:8
[INFO] [stderr]    |
[INFO] [stderr] 14 |     fn breathe_in() {
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Vegetable`
[INFO] [stderr]   --> src/ch07/mod.rs:26:16
[INFO] [stderr]    |
[INFO] [stderr] 26 |     pub struct Vegetable {
[INFO] [stderr]    |                ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/ch07/mod.rs:32:16
[INFO] [stderr]    |
[INFO] [stderr] 32 |         pub fn new(name: &str) -> Vegetable {
[INFO] [stderr]    |                ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generate_struct`
[INFO] [stderr]   --> src/ch07/mod.rs:40:12
[INFO] [stderr]    |
[INFO] [stderr] 40 |     pub fn generate_struct() -> Vegetable {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Appetizer`
[INFO] [stderr]   --> src/ch07/mod.rs:50:14
[INFO] [stderr]    |
[INFO] [stderr] 50 |     pub enum Appetizer {
[INFO] [stderr]    |              ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `clarinet_trio`
[INFO] [stderr]   --> src/ch07/mod.rs:63:12
[INFO] [stderr]    |
[INFO] [stderr] 63 |     pub fn clarinet_trio() {
[INFO] [stderr]    |            ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `clarinet_trio`
[INFO] [stderr]    --> src/ch07/mod.rs:160:20
[INFO] [stderr]     |
[INFO] [stderr] 160 |             pub fn clarinet_trio() {
[INFO] [stderr]     |                    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `clarinet`
[INFO] [stderr]  --> src/ch07/mod.rs:7:16
[INFO] [stderr]   |
[INFO] [stderr] 7 |         pub fn clarinet() {
[INFO] [stderr]   |                ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `clarinet`
[INFO] [stderr]  --> src/ch07/sound1.rs:2:12
[INFO] [stderr]   |
[INFO] [stderr] 2 |     pub fn clarinet() {
[INFO] [stderr]   |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `clarinet`
[INFO] [stderr]  --> src/ch07/sound2/instrument.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn clarinet() {
[INFO] [stderr]   |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `clarinet`
[INFO] [stderr]  --> src/ch07/sound3/instrument.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn clarinet() {
[INFO] [stderr]   |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `clarinet`
[INFO] [stderr]    --> src/ch07/mod.rs:150:24
[INFO] [stderr]     |
[INFO] [stderr] 150 |                 pub fn clarinet() {
[INFO] [stderr]     |                        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: cannot test inner items
[INFO] [stderr]    --> src/ch13.rs:294:9
[INFO] [stderr]     |
[INFO] [stderr] 294 |         #[test]
[INFO] [stderr]     |         ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unnameable_test_items)]` on by default
[INFO] [stderr]     = note: this warning originates in the attribute macro `test` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: variable `changeColorMessage` should have a snake case name
[INFO] [stderr]   --> src/ch06.rs:87:13
[INFO] [stderr]    |
[INFO] [stderr] 87 |         let changeColorMessage = ChangeColorMessage(1, 1, 1);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `change_color_message`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Filter` that must be used
[INFO] [stderr]    --> src/ch06.rs:299:5
[INFO] [stderr]     |
[INFO] [stderr] 299 |     v.iter().filter(|x| matches!(x, MyEnum::Foo));
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: iterators are lazy and do nothing unless consumed
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Float` should have a snake case name
[INFO] [stderr]    --> src/ch08_vec.rs:126:13
[INFO] [stderr]     |
[INFO] [stderr] 126 |             Float => (),
[INFO] [stderr]     |             ^^^^^ help: convert the identifier to snake case (notice the capitalization): `float`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Text` should have a snake case name
[INFO] [stderr]    --> src/ch08_vec.rs:127:13
[INFO] [stderr]     |
[INFO] [stderr] 127 |             Text => (),
[INFO] [stderr]     |             ^^^^ help: convert the identifier to snake case: `text`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Int` should have a snake case name
[INFO] [stderr]    --> src/ch08_vec.rs:128:13
[INFO] [stderr]     |
[INFO] [stderr] 128 |             Int => (),
[INFO] [stderr]     |             ^^^ help: convert the identifier to snake case (notice the capitalization): `int`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Value` should have a snake case name
[INFO] [stderr]   --> src/ch17.rs:18:22
[INFO] [stderr]    |
[INFO] [stderr] 18 |                 Some(Value) => {
[INFO] [stderr]    |                      ^^^^^ help: convert the identifier to snake case (notice the capitalization): `value`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `length`
[INFO] [stderr]  --> src/ch11_01.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     length: u32,
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]  --> src/ch11_01.rs:3:10
[INFO] [stderr]   |
[INFO] [stderr] 3 | #[derive(Debug)]
[INFO] [stderr]   |          ^^^^^
[INFO] [stderr]   = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `width`
[INFO] [stderr]  --> src/ch11_01.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 |     width: u32,
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]  --> src/ch11_01.rs:3:10
[INFO] [stderr]   |
[INFO] [stderr] 3 | #[derive(Debug)]
[INFO] [stderr]   |          ^^^^^
[INFO] [stderr]   = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `can_hold`
[INFO] [stderr]   --> src/ch11_01.rs:10:12
[INFO] [stderr]    |
[INFO] [stderr] 10 |     pub fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stderr]    |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add_two`
[INFO] [stderr]   --> src/ch11_01.rs:82:8
[INFO] [stderr]    |
[INFO] [stderr] 82 | pub fn add_two(a: i32) -> i32 {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `greeting`
[INFO] [stderr]    --> src/ch11_01.rs:112:8
[INFO] [stderr]     |
[INFO] [stderr] 112 | pub fn greeting(name: &str) -> String {
[INFO] [stderr]     |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Guess`
[INFO] [stderr]    --> src/ch11_01.rs:132:12
[INFO] [stderr]     |
[INFO] [stderr] 132 | pub struct Guess {
[INFO] [stderr]     |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]    --> src/ch11_01.rs:137:12
[INFO] [stderr]     |
[INFO] [stderr] 137 |     pub fn new(value: i32) -> Guess {
[INFO] [stderr]     |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `prints_and_returns_10`
[INFO] [stderr]   --> src/ch11_02.rs:12:4
[INFO] [stderr]    |
[INFO] [stderr] 12 | fn prints_and_returns_10(a: i32) -> i32 {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add_two`
[INFO] [stderr]   --> src/ch11_02.rs:38:8
[INFO] [stderr]    |
[INFO] [stderr] 38 | pub fn add_two(a: i32) -> i32 {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `internal_adder`
[INFO] [stderr]   --> src/ch11_03.rs:22:4
[INFO] [stderr]    |
[INFO] [stderr] 22 | fn internal_adder(a: i32, b: i32) -> i32 {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `search`
[INFO] [stderr]   --> src/ch12.rs:72:8
[INFO] [stderr]    |
[INFO] [stderr] 72 | pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `LimitTracker`
[INFO] [stderr]    --> src/ch15.rs:347:12
[INFO] [stderr]     |
[INFO] [stderr] 347 | pub struct LimitTracker<'a, T: Messenger> {
[INFO] [stderr]     |            ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]    --> src/ch15.rs:357:12
[INFO] [stderr]     |
[INFO] [stderr] 357 |     pub fn new(messenger: &T, max: usize) -> LimitTracker<T> {
[INFO] [stderr]     |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `set_value`
[INFO] [stderr]    --> src/ch15.rs:365:12
[INFO] [stderr]     |
[INFO] [stderr] 365 |     pub fn set_value(&mut self, value: usize) {
[INFO] [stderr]     |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `the_rust_programming_language` (test "integration_test") generated 1 warning
[INFO] [stderr] warning: `the_rust_programming_language` (bin "the_rust_programming_language" test) generated 169 warnings
[INFO] [stderr] warning: `the_rust_programming_language` (bin "the_rust_programming_language") generated 181 warnings (167 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 55.74s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/the_rust_programming_language-1588b01c4c712f97)
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test tests::case_insensitive ... ok
[INFO] [stdout] test tests::case_sensitive ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/the_rust_programming_language-ba40f864915e8a59)
[INFO] [stdout] 
[INFO] [stdout] running 18 tests
[INFO] [stdout] test ch11_01::test4::greeting_contains_name ... ok
[INFO] [stdout] test ch11_01::tests1::it_works ... ok
[INFO] [stdout] test ch11_01::tests2::larger_can_hold_smaller ... ok
[INFO] [stdout] test ch11_01::tests2::smaller_cannot_hold_larger ... ok
[INFO] [stdout] test ch11_01::tests3::it_adds_two ... ok
[INFO] [stdout] test ch11_01::tests3::test_struct ... ok
[INFO] [stdout] test ch11_01::tests6::it_works ... ok
[INFO] [stdout] test ch11_02::tests1::add_three_and_two ... ok
[INFO] [stdout] test ch11_02::tests1::expensive_test ... ignored
[INFO] [stdout] test ch11_02::tests1::add_two_and_two ... ok
[INFO] [stdout] test ch11_02::tests::this_test_will_pass ... ok
[INFO] [stdout] test ch11_03::tests::internal ... ok
[INFO] [stdout] test ch11_02::tests1::one_hundred ... ok
[INFO] [stdout] test ch12::tests::one_result ... ok
[INFO] [stdout] test ch13::iterator_demonstration ... ok
[INFO] [stdout] test ch15::tests::it_sends_an_over_75_percent_warning_message ... ok
[INFO] [stderr]      Running tests/integration_test.rs (/opt/rustwide/target/debug/deps/integration_test-e37dbe96c2374c05)
[INFO] [stdout] test ch11_02::tests::this_test_will_fail - should panic ... ok
[INFO] [stdout] test ch11_01::tests5::greater_than_100 - should panic ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 17 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in 0.02s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests the_rust_programming_language
[INFO] [stdout] running 1 test
[INFO] [stdout] test it_adds_two ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs - add_one (line 259) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.54s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "b796e1f34eeeb278c4f1c7da23926f38dbd68077133c035ed3a002b88555f001", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b796e1f34eeeb278c4f1c7da23926f38dbd68077133c035ed3a002b88555f001", kill_on_drop: false }`
[INFO] [stdout] b796e1f34eeeb278c4f1c7da23926f38dbd68077133c035ed3a002b88555f001