[INFO] cloning repository https://github.com/messi18/rust-programming-
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/messi18/rust-programming-" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmessi18%2Frust-programming-", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmessi18%2Frust-programming-'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ec972d023e787c308383fff35ad0bdbbc44cd738
[INFO] checking messi18/rust-programming- against try#b152f5575a2ac7126ae0019e4e679abe9399213e for pr-157841
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmessi18%2Frust-programming-" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/messi18/rust-programming-
[INFO] finished tweaking git repo https://github.com/messi18/rust-programming-
[INFO] tweaked toml for git repo https://github.com/messi18/rust-programming- written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/messi18/rust-programming- on toolchain b152f5575a2ac7126ae0019e4e679abe9399213e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b152f5575a2ac7126ae0019e4e679abe9399213e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/messi18/rust-programming- already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b152f5575a2ac7126ae0019e4e679abe9399213e" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3e793bdf10248eb2ddbd6b0faebed8155c11b4589982e2893733958d93e8d540" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] bff02c4abe3a2ef46e03dc5389dce296c3d43aa98bf74685d9f3b95ec1b22fd7
[INFO] running `Command { std: "docker" "start" "bff02c4abe3a2ef46e03dc5389dce296c3d43aa98bf74685d9f3b95ec1b22fd7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "bff02c4abe3a2ef46e03dc5389dce296c3d43aa98bf74685d9f3b95ec1b22fd7" "/opt/rustwide/cargo-home/bin/cargo" "+b152f5575a2ac7126ae0019e4e679abe9399213e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bff02c4abe3a2ef46e03dc5389dce296c3d43aa98bf74685d9f3b95ec1b22fd7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-w" "/opt/rustwide/workdir" "--user" "0:0" "bff02c4abe3a2ef46e03dc5389dce296c3d43aa98bf74685d9f3b95ec1b22fd7" "/opt/rustwide/cargo-home/bin/cargo" "+b152f5575a2ac7126ae0019e4e679abe9399213e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_programming_practice v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `use_string` and `use_vec`
[INFO] [stdout]  --> src/ch8.rs:2:22
[INFO] [stdout]   |
[INFO] [stdout] 2 |     use crate::ch8::{use_string, use_vec};
[INFO] [stdout]   |                      ^^^^^^^^^^  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::ch13::calculation_intensity`
[INFO] [stdout]   --> src/ch13.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     use crate::ch13::calculation_intensity;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::ch16::use_thread`
[INFO] [stdout]   --> src/ch16.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     use crate::ch16::use_thread;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `contents`
[INFO] [stdout]   --> src/ch12.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let contents = run(config).unwrap_or_else(|e| {
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_contents`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `intensity`
[INFO] [stdout]   --> src/ch13.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn workout(intensity:i32) {
[INFO] [stdout]    |            ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_intensity`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run3_1` is never used
[INFO] [stdout]   --> src/ch4.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn run3_1() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run3_2` is never used
[INFO] [stdout]   --> src/ch4.rs:43:4
[INFO] [stdout]    |
[INFO] [stdout] 43 | fn run3_2() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run3_3` is never used
[INFO] [stdout]   --> src/ch4.rs:59:4
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn run3_3() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run3_5` is never used
[INFO] [stdout]   --> src/ch4.rs:67:4
[INFO] [stdout]    |
[INFO] [stdout] 67 | fn run3_5() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_ownership` is never used
[INFO] [stdout]   --> src/ch4.rs:78:4
[INFO] [stdout]    |
[INFO] [stdout] 78 | fn get_ownership() -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_ownership_back` is never used
[INFO] [stdout]   --> src/ch4.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn get_ownership_back(s:String)-> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_first_word` is never used
[INFO] [stdout]   --> src/ch4.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn get_first_word(s:&String) -> &str {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]  --> src/ch5.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_user` is never used
[INFO] [stdout]   --> src/ch5.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn build_user(mail:String, username:String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest` is never used
[INFO] [stdout]   --> src/ch10.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn largest<T: PartialOrd + Copy >(list: &[T]) -> T {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_10` is never used
[INFO] [stdout]   --> src/ch10.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn test_10() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]   --> src/ch10.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 40 | struct Point<X1,Y1> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `x` is never used
[INFO] [stdout]   --> src/ch10.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 45 | impl <X1 ,Y1> Point<X1,Y1> {
[INFO] [stdout]    | -------------------------- method in this implementation
[INFO] [stdout] 46 |     fn x(&self)->&X1 {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `distance_from_origin` is never used
[INFO] [stdout]   --> src/ch10.rs:69:8
[INFO] [stdout]    |
[INFO] [stdout] 68 | impl Point<f32,f32> {
[INFO] [stdout]    | ------------------- method in this implementation
[INFO] [stdout] 69 |     fn distance_from_origin(&self)-> f32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_iter_impl` is never used
[INFO] [stdout]   --> src/ch10.rs:74:4
[INFO] [stdout]    |
[INFO] [stdout] 74 | fn test_iter_impl() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `use_vec` is never used
[INFO] [stdout]   --> src/ch8.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn use_vec() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `use_string` is never used
[INFO] [stdout]   --> src/ch8.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn use_string() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `simple_grep` is never used
[INFO] [stdout]  --> src/ch12.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn simple_grep(args:&[String])  {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/ch12.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn run(config: Config) -> Result<String,Box<dyn Error>> {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Config` is never constructed
[INFO] [stdout]   --> src/ch12.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | struct Config {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/ch12.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | impl Config {
[INFO] [stdout]    | ----------- associated function in this implementation
[INFO] [stdout] 28 |     fn new(args: &[String]) -> Result<Config, &'static str> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculation_intensity` is never used
[INFO] [stdout]  --> src/ch13.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn calculation_intensity(intensity:i32) -> i32 {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `workout` is never used
[INFO] [stdout]   --> src/ch13.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn workout(intensity:i32) {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cacher` is never constructed
[INFO] [stdout]   --> src/ch13.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Cacher<T>
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `value` are never used
[INFO] [stdout]   --> src/ch13.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | / impl <T> Cacher<T>
[INFO] [stdout] 28 | |     where T : Fn(i32)-> i32
[INFO] [stdout]    | |___________________________- associated items in this implementation
[INFO] [stdout] 29 |   {
[INFO] [stdout] 30 |       fn new(f: T) -> Cacher<T> {
[INFO] [stdout]    |          ^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |       fn value(&mut self, i:i32) -> i32 {
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MyBox` is never constructed
[INFO] [stdout]  --> src/ch15.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct MyBox<T> (T);
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/ch15.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl <T> MyBox<T> {
[INFO] [stdout]    | ----------------- associated function in this implementation
[INFO] [stdout] 13 |     fn new(t:T)-> MyBox<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `use_my_box` is never used
[INFO] [stdout]   --> src/ch15.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn use_my_box() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `use_thread` is never used
[INFO] [stdout]  --> src/ch16.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn use_thread() {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: structure field `fileName` should have a snake case name
[INFO] [stdout]   --> src/ch12.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fileName: String,
[INFO] [stdout]    |     ^^^^^^^^ help: convert the identifier to snake case: `file_name`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `fileName` should have a snake case name
[INFO] [stdout]   --> src/ch12.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let fileName = args[1].clone();
[INFO] [stdout]    |             ^^^^^^^^ help: convert the identifier to snake case: `file_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `contents`
[INFO] [stdout]   --> src/ch12.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let contents = run(config).unwrap_or_else(|e| {
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_contents`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `intensity`
[INFO] [stdout]   --> src/ch13.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn workout(intensity:i32) {
[INFO] [stdout]    |            ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_intensity`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_ownership` is never used
[INFO] [stdout]   --> src/ch4.rs:78:4
[INFO] [stdout]    |
[INFO] [stdout] 78 | fn get_ownership() -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_ownership_back` is never used
[INFO] [stdout]   --> src/ch4.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn get_ownership_back(s:String)-> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_first_word` is never used
[INFO] [stdout]   --> src/ch4.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn get_first_word(s:&String) -> &str {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `simple_grep` is never used
[INFO] [stdout]  --> src/ch12.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn simple_grep(args:&[String])  {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/ch12.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn run(config: Config) -> Result<String,Box<dyn Error>> {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Config` is never constructed
[INFO] [stdout]   --> src/ch12.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | struct Config {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/ch12.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | impl Config {
[INFO] [stdout]    | ----------- associated function in this implementation
[INFO] [stdout] 28 |     fn new(args: &[String]) -> Result<Config, &'static str> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `workout` is never used
[INFO] [stdout]   --> src/ch13.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn workout(intensity:i32) {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cacher` is never constructed
[INFO] [stdout]   --> src/ch13.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Cacher<T>
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `value` are never used
[INFO] [stdout]   --> src/ch13.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | / impl <T> Cacher<T>
[INFO] [stdout] 28 | |     where T : Fn(i32)-> i32
[INFO] [stdout]    | |___________________________- associated items in this implementation
[INFO] [stdout] 29 |   {
[INFO] [stdout] 30 |       fn new(f: T) -> Cacher<T> {
[INFO] [stdout]    |          ^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |       fn value(&mut self, i:i32) -> i32 {
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MyBox` is never constructed
[INFO] [stdout]  --> src/ch15.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct MyBox<T> (T);
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/ch15.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl <T> MyBox<T> {
[INFO] [stdout]    | ----------------- associated function in this implementation
[INFO] [stdout] 13 |     fn new(t:T)-> MyBox<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `use_my_box` is never used
[INFO] [stdout]   --> src/ch15.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn use_my_box() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: structure field `fileName` should have a snake case name
[INFO] [stdout]   --> src/ch12.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fileName: String,
[INFO] [stdout]    |     ^^^^^^^^ help: convert the identifier to snake case: `file_name`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `fileName` should have a snake case name
[INFO] [stdout]   --> src/ch12.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let fileName = args[1].clone();
[INFO] [stdout]    |             ^^^^^^^^ help: convert the identifier to snake case: `file_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.10s
[INFO] running `Command { std: "docker" "inspect" "bff02c4abe3a2ef46e03dc5389dce296c3d43aa98bf74685d9f3b95ec1b22fd7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bff02c4abe3a2ef46e03dc5389dce296c3d43aa98bf74685d9f3b95ec1b22fd7", kill_on_drop: false }`
[INFO] [stdout] bff02c4abe3a2ef46e03dc5389dce296c3d43aa98bf74685d9f3b95ec1b22fd7
