[INFO] cloning repository https://github.com/szymonnogiec/rust_test
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/szymonnogiec/rust_test" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fszymonnogiec%2Frust_test", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fszymonnogiec%2Frust_test'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 289e2be96ae8df366093d095c2aa6223938bf1bf
[INFO] testing szymonnogiec/rust_test against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fszymonnogiec%2Frust_test" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/szymonnogiec/rust_test on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/szymonnogiec/rust_test
[INFO] finished tweaking git repo https://github.com/szymonnogiec/rust_test
[INFO] tweaked toml for git repo https://github.com/szymonnogiec/rust_test written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/szymonnogiec/rust_test already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 39c148dddb3808ba2aaddb7e09a61cf3cb42ce0df5ff9ad1b9b6a48cd3956e4f
[INFO] running `Command { std: "docker" "start" "-a" "39c148dddb3808ba2aaddb7e09a61cf3cb42ce0df5ff9ad1b9b6a48cd3956e4f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "39c148dddb3808ba2aaddb7e09a61cf3cb42ce0df5ff9ad1b9b6a48cd3956e4f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39c148dddb3808ba2aaddb7e09a61cf3cb42ce0df5ff9ad1b9b6a48cd3956e4f", kill_on_drop: false }`
[INFO] [stdout] 39c148dddb3808ba2aaddb7e09a61cf3cb42ce0df5ff9ad1b9b6a48cd3956e4f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e6a49bb9b908e9441cc321498453f0e613a7ba71f32eaf66993e5dc9779851d4
[INFO] running `Command { std: "docker" "start" "-a" "e6a49bb9b908e9441cc321498453f0e613a7ba71f32eaf66993e5dc9779851d4", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.97
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling rust_test v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::cmp::Ordering`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::cmp::Ordering;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::convert::Infallible`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::convert::Infallible;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::path::Iter`
[INFO] [stdout]   --> src/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use std::path::Iter;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::process::exit`
[INFO] [stdout]   --> src/main.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use std::process::exit;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::Rng`
[INFO] [stdout]   --> src/main.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | use rand::Rng;
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/main.rs:214:15
[INFO] [stdout]     |
[INFO] [stdout] 214 |     let avg = (sum as f64 / v_len as f64);
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `MutexGuard`, `Mutex`
[INFO] [stdout]    --> src/main.rs:553:17
[INFO] [stdout]     |
[INFO] [stdout] 553 | use std::sync::{Mutex, MutexGuard};
[INFO] [stdout]     |                 ^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Mutex` is imported redundantly
[INFO] [stdout]    --> src/main.rs:668:9
[INFO] [stdout]     |
[INFO] [stdout] 553 | use std::sync::{Mutex, MutexGuard};
[INFO] [stdout]     |                 ----- the item `Mutex` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 668 |     use std::sync::Mutex;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]    --> src/main.rs:124:9
[INFO] [stdout]     |
[INFO] [stdout] 124 |     let six = plus_one(five);
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `none`
[INFO] [stdout]    --> src/main.rs:125:9
[INFO] [stdout]     |
[INFO] [stdout] 125 |     let none = plus_one(None);
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_none`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:138:9
[INFO] [stdout]     |
[INFO] [stdout] 138 |     let x = &v[1];
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v2`
[INFO] [stdout]    --> src/main.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 144 |     let v2 = vec!["b", "v"];
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_v2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `first`
[INFO] [stdout]    --> src/main.rs:147:9
[INFO] [stdout]     |
[INFO] [stdout] 147 |     let first = &vector[0];
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scores2`
[INFO] [stdout]    --> src/main.rs:192:13
[INFO] [stdout]     |
[INFO] [stdout] 192 |     let mut scores2: HashMap<_, _> = teams.iter().zip(init_scores.iter()).collect();
[INFO] [stdout]     |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_scores2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]    --> src/main.rs:238:9
[INFO] [stdout]     |
[INFO] [stdout] 238 |     let f = match f {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home`
[INFO] [stdout]    --> src/main.rs:272:9
[INFO] [stdout]     |
[INFO] [stdout] 272 |     let home: IPStd = "127.0.0.1".parse().unwrap();
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]    --> src/main.rs:274:9
[INFO] [stdout]     |
[INFO] [stdout] 274 |     let f = File::open("hello.txt")?.read_to_string(&mut s)?;
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `integer`
[INFO] [stdout]    --> src/main.rs:306:9
[INFO] [stdout]     |
[INFO] [stdout] 306 |     let integer = Point { x: 5, y: 10 };
[INFO] [stdout]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_integer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `float`
[INFO] [stdout]    --> src/main.rs:307:9
[INFO] [stdout]     |
[INFO] [stdout] 307 |     let float = Point { x: 1.0, y: 2.0 };
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_float`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/main.rs:398:9
[INFO] [stdout]     |
[INFO] [stdout] 398 |     let s: &'static str = "I have a static lifetime";
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:413:9
[INFO] [stdout]     |
[INFO] [stdout] 413 |     let i = ImportantExcept {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]    --> src/main.rs:467:49
[INFO] [stdout]     |
[INFO] [stdout] 467 |         let mut expensive_result = Cacher::new(|num| {
[INFO] [stdout]     |                                                 ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sum`
[INFO] [stdout]    --> src/main.rs:498:9
[INFO] [stdout]     |
[INFO] [stdout] 498 |     let sum: u32 = v1.iter().sum();
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `blablator`
[INFO] [stdout]    --> src/main.rs:500:9
[INFO] [stdout]     |
[INFO] [stdout] 500 |     let blablator: Vec<u32> = v1.iter().map(|x| x + 1).collect();
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_blablator`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sum`
[INFO] [stdout]    --> src/main.rs:501:9
[INFO] [stdout]     |
[INFO] [stdout] 501 |     let sum: u32 = v1.iter().sum();
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:141:9
[INFO] [stdout]     |
[INFO] [stdout] 141 |     let mut e = &mut v[1];
[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/main.rs:191:9
[INFO] [stdout]     |
[INFO] [stdout] 191 |     let mut init_scores = vec![10, 50];
[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/main.rs:192:9
[INFO] [stdout]     |
[INFO] [stdout] 192 |     let mut scores2: HashMap<_, _> = teams.iter().zip(init_scores.iter()).collect();
[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/main.rs:494:9
[INFO] [stdout]     |
[INFO] [stdout] 494 |     let mut v1 = vec![1, 2, 3];
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `area`
[INFO] [stdout]   --> src/main.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 |     fn area(&self) -> u32 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `height`
[INFO] [stdout]   --> src/main.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn height(&self) -> u32 {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `double_height`
[INFO] [stdout]   --> src/main.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn double_height(&mut self) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/main.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `name`
[INFO] [stdout]   --> src/main.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 |     fn name() -> String {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `square`
[INFO] [stdout]   --> src/main.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 |     fn square(size: u32) -> Rectangle {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `rectangle_test`
[INFO] [stdout]   --> src/main.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn rectangle_test() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V4`
[INFO] [stdout]   --> src/main.rs:85:5
[INFO] [stdout]    |
[INFO] [stdout] 85 |     V4,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]   --> src/main.rs:86:5
[INFO] [stdout]    |
[INFO] [stdout] 86 |     V6,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V4`
[INFO] [stdout]   --> src/main.rs:97:5
[INFO] [stdout]    |
[INFO] [stdout] 97 |     V4(u8, u8, u8, u8),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]   --> src/main.rs:98:5
[INFO] [stdout]    |
[INFO] [stdout] 98 |     V6(String),
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ip_test`
[INFO] [stdout]    --> src/main.rs:101:4
[INFO] [stdout]     |
[INFO] [stdout] 101 | fn ip_test() {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `opt_test`
[INFO] [stdout]    --> src/main.rs:116:4
[INFO] [stdout]     |
[INFO] [stdout] 116 | fn opt_test() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `vec_test`
[INFO] [stdout]    --> src/main.rs:133:4
[INFO] [stdout]     |
[INFO] [stdout] 133 | fn vec_test() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `str_test`
[INFO] [stdout]    --> src/main.rs:168:4
[INFO] [stdout]     |
[INFO] [stdout] 168 | fn str_test() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chars_test`
[INFO] [stdout]    --> src/main.rs:177:4
[INFO] [stdout]     |
[INFO] [stdout] 177 | fn chars_test() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `hashmap_test`
[INFO] [stdout]    --> src/main.rs:184:4
[INFO] [stdout]     |
[INFO] [stdout] 184 | fn hashmap_test() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ex1`
[INFO] [stdout]    --> src/main.rs:207:4
[INFO] [stdout]     |
[INFO] [stdout] 207 | fn ex1() {
[INFO] [stdout]     |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `panic`
[INFO] [stdout]    --> src/main.rs:230:4
[INFO] [stdout]     |
[INFO] [stdout] 230 | fn panic() {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `open_file`
[INFO] [stdout]    --> src/main.rs:235:4
[INFO] [stdout]     |
[INFO] [stdout] 235 | fn open_file() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file`
[INFO] [stdout]    --> src/main.rs:258:4
[INFO] [stdout]     |
[INFO] [stdout] 258 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file_with_question`
[INFO] [stdout]    --> src/main.rs:271:4
[INFO] [stdout]     |
[INFO] [stdout] 271 | fn read_username_from_file_with_question() -> Result<String, io::Error> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest`
[INFO] [stdout]    --> src/main.rs:279:4
[INFO] [stdout]     |
[INFO] [stdout] 279 | fn largest<T: PartialOrd>(list: &[T]) -> &T {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `struct_template`
[INFO] [stdout]    --> src/main.rs:290:4
[INFO] [stdout]     |
[INFO] [stdout] 290 | fn struct_template() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `traits_example`
[INFO] [stdout]    --> src/main.rs:310:4
[INFO] [stdout]     |
[INFO] [stdout] 310 | fn traits_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `conditional_traits`
[INFO] [stdout]    --> src/main.rs:354:4
[INFO] [stdout]     |
[INFO] [stdout] 354 | fn conditional_traits() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest`
[INFO] [stdout]    --> src/main.rs:379:4
[INFO] [stdout]     |
[INFO] [stdout] 379 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ttl_test`
[INFO] [stdout]    --> src/main.rs:387:4
[INFO] [stdout]     |
[INFO] [stdout] 387 | fn ttl_test() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ttl_test2`
[INFO] [stdout]    --> src/main.rs:397:4
[INFO] [stdout]     |
[INFO] [stdout] 397 | fn ttl_test2() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `generic_traits_ttl`
[INFO] [stdout]    --> src/main.rs:418:4
[INFO] [stdout]     |
[INFO] [stdout] 418 | fn generic_traits_ttl() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Cacher`
[INFO] [stdout]    --> src/main.rs:434:8
[INFO] [stdout]     |
[INFO] [stdout] 434 | struct Cacher<T>
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/main.rs:446:8
[INFO] [stdout]     |
[INFO] [stdout] 446 |     fn new(calculation: T) -> Cacher<T> {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]    --> src/main.rs:453:8
[INFO] [stdout]     |
[INFO] [stdout] 453 |     fn value(&mut self, arg: u32) -> u32 {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `closure_one`
[INFO] [stdout]    --> src/main.rs:465:4
[INFO] [stdout]     |
[INFO] [stdout] 465 | fn closure_one() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `iterators`
[INFO] [stdout]    --> src/main.rs:493:4
[INFO] [stdout]     |
[INFO] [stdout] 493 | fn iterators() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shoes_in_my_size`
[INFO] [stdout]    --> src/main.rs:512:4
[INFO] [stdout]     |
[INFO] [stdout] 512 | fn shoes_in_my_size(shoes: Vec<Shoe>, shoe_size: u32) -> Vec<Shoe> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/main.rs:520:8
[INFO] [stdout]     |
[INFO] [stdout] 520 |     fn new() -> Counter {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `List`
[INFO] [stdout]    --> src/main.rs:538:6
[INFO] [stdout]     |
[INFO] [stdout] 538 | enum List {
[INFO] [stdout]     |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/main.rs:546:8
[INFO] [stdout]     |
[INFO] [stdout] 546 |     fn new(x: T) -> MyBox<T> {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `threads_test`
[INFO] [stdout]    --> src/main.rs:615:4
[INFO] [stdout]     |
[INFO] [stdout] 615 | fn threads_test() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `channels_test`
[INFO] [stdout]    --> src/main.rs:633:4
[INFO] [stdout]     |
[INFO] [stdout] 633 | fn channels_test() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `mutex_test`
[INFO] [stdout]    --> src/main.rs:667:4
[INFO] [stdout]     |
[INFO] [stdout] 667 | fn mutex_test() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 72 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.65s
[INFO] running `Command { std: "docker" "inspect" "e6a49bb9b908e9441cc321498453f0e613a7ba71f32eaf66993e5dc9779851d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e6a49bb9b908e9441cc321498453f0e613a7ba71f32eaf66993e5dc9779851d4", kill_on_drop: false }`
[INFO] [stdout] e6a49bb9b908e9441cc321498453f0e613a7ba71f32eaf66993e5dc9779851d4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a283f25029ea1e36f3a18b72725223fb21dfd8bad50b04ec4be9dbe84da54051
[INFO] running `Command { std: "docker" "start" "-a" "a283f25029ea1e36f3a18b72725223fb21dfd8bad50b04ec4be9dbe84da54051", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_test v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::cmp::Ordering`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::cmp::Ordering;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::convert::Infallible`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::convert::Infallible;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::path::Iter`
[INFO] [stdout]   --> src/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use std::path::Iter;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::process::exit`
[INFO] [stdout]   --> src/main.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use std::process::exit;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::Rng`
[INFO] [stdout]   --> src/main.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | use rand::Rng;
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/main.rs:214:15
[INFO] [stdout]     |
[INFO] [stdout] 214 |     let avg = (sum as f64 / v_len as f64);
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `MutexGuard`, `Mutex`
[INFO] [stdout]    --> src/main.rs:553:17
[INFO] [stdout]     |
[INFO] [stdout] 553 | use std::sync::{Mutex, MutexGuard};
[INFO] [stdout]     |                 ^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Mutex` is imported redundantly
[INFO] [stdout]    --> src/main.rs:668:9
[INFO] [stdout]     |
[INFO] [stdout] 553 | use std::sync::{Mutex, MutexGuard};
[INFO] [stdout]     |                 ----- the item `Mutex` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 668 |     use std::sync::Mutex;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Ref`
[INFO] [stdout]    --> src/main.rs:691:21
[INFO] [stdout]     |
[INFO] [stdout] 691 |     use std::cell::{Ref, RefCell};
[INFO] [stdout]     |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]    --> src/main.rs:124:9
[INFO] [stdout]     |
[INFO] [stdout] 124 |     let six = plus_one(five);
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `none`
[INFO] [stdout]    --> src/main.rs:125:9
[INFO] [stdout]     |
[INFO] [stdout] 125 |     let none = plus_one(None);
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_none`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:138:9
[INFO] [stdout]     |
[INFO] [stdout] 138 |     let x = &v[1];
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v2`
[INFO] [stdout]    --> src/main.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 144 |     let v2 = vec!["b", "v"];
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_v2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `first`
[INFO] [stdout]    --> src/main.rs:147:9
[INFO] [stdout]     |
[INFO] [stdout] 147 |     let first = &vector[0];
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scores2`
[INFO] [stdout]    --> src/main.rs:192:13
[INFO] [stdout]     |
[INFO] [stdout] 192 |     let mut scores2: HashMap<_, _> = teams.iter().zip(init_scores.iter()).collect();
[INFO] [stdout]     |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_scores2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]    --> src/main.rs:238:9
[INFO] [stdout]     |
[INFO] [stdout] 238 |     let f = match f {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home`
[INFO] [stdout]    --> src/main.rs:272:9
[INFO] [stdout]     |
[INFO] [stdout] 272 |     let home: IPStd = "127.0.0.1".parse().unwrap();
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]    --> src/main.rs:274:9
[INFO] [stdout]     |
[INFO] [stdout] 274 |     let f = File::open("hello.txt")?.read_to_string(&mut s)?;
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `integer`
[INFO] [stdout]    --> src/main.rs:306:9
[INFO] [stdout]     |
[INFO] [stdout] 306 |     let integer = Point { x: 5, y: 10 };
[INFO] [stdout]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_integer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `float`
[INFO] [stdout]    --> src/main.rs:307:9
[INFO] [stdout]     |
[INFO] [stdout] 307 |     let float = Point { x: 1.0, y: 2.0 };
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_float`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/main.rs:398:9
[INFO] [stdout]     |
[INFO] [stdout] 398 |     let s: &'static str = "I have a static lifetime";
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:413:9
[INFO] [stdout]     |
[INFO] [stdout] 413 |     let i = ImportantExcept {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]    --> src/main.rs:467:49
[INFO] [stdout]     |
[INFO] [stdout] 467 |         let mut expensive_result = Cacher::new(|num| {
[INFO] [stdout]     |                                                 ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sum`
[INFO] [stdout]    --> src/main.rs:498:9
[INFO] [stdout]     |
[INFO] [stdout] 498 |     let sum: u32 = v1.iter().sum();
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `blablator`
[INFO] [stdout]    --> src/main.rs:500:9
[INFO] [stdout]     |
[INFO] [stdout] 500 |     let blablator: Vec<u32> = v1.iter().map(|x| x + 1).collect();
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_blablator`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sum`
[INFO] [stdout]    --> src/main.rs:501:9
[INFO] [stdout]     |
[INFO] [stdout] 501 |     let sum: u32 = v1.iter().sum();
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v1`
[INFO] [stdout]    --> src/main.rs:697:13
[INFO] [stdout]     |
[INFO] [stdout] 697 |         let v1 = c.value(1);
[INFO] [stdout]     |             ^^ help: if this is intentional, prefix it with an underscore: `_v1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]    --> src/main.rs:756:13
[INFO] [stdout]     |
[INFO] [stdout] 756 |         let d = CustomSmartPointer {
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/main.rs:775:17
[INFO] [stdout]     |
[INFO] [stdout] 775 |             let b = Cons(Rc::new(RefCell::new(3)), Rc::clone(&a));
[INFO] [stdout]     |                 ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> src/main.rs:777:17
[INFO] [stdout]     |
[INFO] [stdout] 777 |             let c = Cons(Rc::new(RefCell::new(3)), Rc::clone(&a));
[INFO] [stdout]     |                 ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:141:9
[INFO] [stdout]     |
[INFO] [stdout] 141 |     let mut e = &mut v[1];
[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/main.rs:191:9
[INFO] [stdout]     |
[INFO] [stdout] 191 |     let mut init_scores = vec![10, 50];
[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/main.rs:192:9
[INFO] [stdout]     |
[INFO] [stdout] 192 |     let mut scores2: HashMap<_, _> = teams.iter().zip(init_scores.iter()).collect();
[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/main.rs:494:9
[INFO] [stdout]     |
[INFO] [stdout] 494 |     let mut v1 = vec![1, 2, 3];
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `area`
[INFO] [stdout]   --> src/main.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 |     fn area(&self) -> u32 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `height`
[INFO] [stdout]   --> src/main.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn height(&self) -> u32 {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `double_height`
[INFO] [stdout]   --> src/main.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn double_height(&mut self) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/main.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `name`
[INFO] [stdout]   --> src/main.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 |     fn name() -> String {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `square`
[INFO] [stdout]   --> src/main.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 |     fn square(size: u32) -> Rectangle {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `rectangle_test`
[INFO] [stdout]   --> src/main.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn rectangle_test() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V4`
[INFO] [stdout]   --> src/main.rs:85:5
[INFO] [stdout]    |
[INFO] [stdout] 85 |     V4,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]   --> src/main.rs:86:5
[INFO] [stdout]    |
[INFO] [stdout] 86 |     V6,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V4`
[INFO] [stdout]   --> src/main.rs:97:5
[INFO] [stdout]    |
[INFO] [stdout] 97 |     V4(u8, u8, u8, u8),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]   --> src/main.rs:98:5
[INFO] [stdout]    |
[INFO] [stdout] 98 |     V6(String),
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ip_test`
[INFO] [stdout]    --> src/main.rs:101:4
[INFO] [stdout]     |
[INFO] [stdout] 101 | fn ip_test() {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `opt_test`
[INFO] [stdout]    --> src/main.rs:116:4
[INFO] [stdout]     |
[INFO] [stdout] 116 | fn opt_test() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `vec_test`
[INFO] [stdout]    --> src/main.rs:133:4
[INFO] [stdout]     |
[INFO] [stdout] 133 | fn vec_test() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `str_test`
[INFO] [stdout]    --> src/main.rs:168:4
[INFO] [stdout]     |
[INFO] [stdout] 168 | fn str_test() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chars_test`
[INFO] [stdout]    --> src/main.rs:177:4
[INFO] [stdout]     |
[INFO] [stdout] 177 | fn chars_test() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `hashmap_test`
[INFO] [stdout]    --> src/main.rs:184:4
[INFO] [stdout]     |
[INFO] [stdout] 184 | fn hashmap_test() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ex1`
[INFO] [stdout]    --> src/main.rs:207:4
[INFO] [stdout]     |
[INFO] [stdout] 207 | fn ex1() {
[INFO] [stdout]     |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `panic`
[INFO] [stdout]    --> src/main.rs:230:4
[INFO] [stdout]     |
[INFO] [stdout] 230 | fn panic() {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `open_file`
[INFO] [stdout]    --> src/main.rs:235:4
[INFO] [stdout]     |
[INFO] [stdout] 235 | fn open_file() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file`
[INFO] [stdout]    --> src/main.rs:258:4
[INFO] [stdout]     |
[INFO] [stdout] 258 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file_with_question`
[INFO] [stdout]    --> src/main.rs:271:4
[INFO] [stdout]     |
[INFO] [stdout] 271 | fn read_username_from_file_with_question() -> Result<String, io::Error> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest`
[INFO] [stdout]    --> src/main.rs:279:4
[INFO] [stdout]     |
[INFO] [stdout] 279 | fn largest<T: PartialOrd>(list: &[T]) -> &T {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `struct_template`
[INFO] [stdout]    --> src/main.rs:290:4
[INFO] [stdout]     |
[INFO] [stdout] 290 | fn struct_template() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `traits_example`
[INFO] [stdout]    --> src/main.rs:310:4
[INFO] [stdout]     |
[INFO] [stdout] 310 | fn traits_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `conditional_traits`
[INFO] [stdout]    --> src/main.rs:354:4
[INFO] [stdout]     |
[INFO] [stdout] 354 | fn conditional_traits() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest`
[INFO] [stdout]    --> src/main.rs:379:4
[INFO] [stdout]     |
[INFO] [stdout] 379 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ttl_test`
[INFO] [stdout]    --> src/main.rs:387:4
[INFO] [stdout]     |
[INFO] [stdout] 387 | fn ttl_test() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ttl_test2`
[INFO] [stdout]    --> src/main.rs:397:4
[INFO] [stdout]     |
[INFO] [stdout] 397 | fn ttl_test2() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `generic_traits_ttl`
[INFO] [stdout]    --> src/main.rs:418:4
[INFO] [stdout]     |
[INFO] [stdout] 418 | fn generic_traits_ttl() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `closure_one`
[INFO] [stdout]    --> src/main.rs:465:4
[INFO] [stdout]     |
[INFO] [stdout] 465 | fn closure_one() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `iterators`
[INFO] [stdout]    --> src/main.rs:493:4
[INFO] [stdout]     |
[INFO] [stdout] 493 | fn iterators() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `threads_test`
[INFO] [stdout]    --> src/main.rs:615:4
[INFO] [stdout]     |
[INFO] [stdout] 615 | fn threads_test() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `channels_test`
[INFO] [stdout]    --> src/main.rs:633:4
[INFO] [stdout]     |
[INFO] [stdout] 633 | fn channels_test() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `mutex_test`
[INFO] [stdout]    --> src/main.rs:667:4
[INFO] [stdout]     |
[INFO] [stdout] 667 | fn mutex_test() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 70 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.28s
[INFO] running `Command { std: "docker" "inspect" "a283f25029ea1e36f3a18b72725223fb21dfd8bad50b04ec4be9dbe84da54051", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a283f25029ea1e36f3a18b72725223fb21dfd8bad50b04ec4be9dbe84da54051", kill_on_drop: false }`
[INFO] [stdout] a283f25029ea1e36f3a18b72725223fb21dfd8bad50b04ec4be9dbe84da54051
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 27a207f23505550940f8c7181fc8ed26ffadc382a80b426a1b9cfd92a08126fe
[INFO] running `Command { std: "docker" "start" "-a" "27a207f23505550940f8c7181fc8ed26ffadc382a80b426a1b9cfd92a08126fe", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: unused import: `std::cmp::Ordering`
[INFO] [stdout] running 9 tests
[INFO] [stderr]  --> src/main.rs:2:5
[INFO] [stdout] test test::calling_next_directly ... ok
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::cmp::Ordering;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::convert::Infallible`
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::convert::Infallible;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::error::Error`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::error::Error;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::path::Iter`
[INFO] [stderr]   --> src/main.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use std::path::Iter;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::process::exit`
[INFO] [stderr]   --> src/main.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 | use std::process::exit;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rand::Rng`
[INFO] [stderr]   --> src/main.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 | use rand::Rng;
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around assigned value
[INFO] [stderr]    --> src/main.rs:214:15
[INFO] [stderr]     |
[INFO] [stderr] 214 |     let avg = (sum as f64 / v_len as f64);
[INFO] [stderr]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `MutexGuard`, `Mutex`
[INFO] [stderr]    --> src/main.rs:553:17
[INFO] [stderr]     |
[INFO] [stderr] 553 | use std::sync::{Mutex, MutexGuard};
[INFO] [stderr]     |                 ^^^^^  ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `Mutex` is imported redundantly
[INFO] [stderr]    --> src/main.rs:668:9
[INFO] [stderr]     |
[INFO] [stderr] 553 | use std::sync::{Mutex, MutexGuard};
[INFO] [stderr]     |                 ----- the item `Mutex` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 668 |     use std::sync::Mutex;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Ref`
[INFO] [stderr]    --> src/main.rs:691:21
[INFO] [stderr]     |
[INFO] [stderr] 691 |     use std::cell::{Ref, RefCell};
[INFO] [stderr]     |                     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `six`
[INFO] [stderr]    --> src/main.rs:124:9
[INFO] [stderr]     |
[INFO] [stderr] 124 |     let six = plus_one(five);
[INFO] [stderr]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `none`
[INFO] [stderr]    --> src/main.rs:125:9
[INFO] [stderr]     |
[INFO] [stderr] 125 |     let none = plus_one(None);
[INFO] [stderr]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_none`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/main.rs:138:9
[INFO] [stderr]     |
[INFO] [stderr] 138 |     let x = &v[1];
[INFO] [stderr]     |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v2`
[INFO] [stderr]    --> src/main.rs:144:9
[INFO] [stderr]     |
[INFO] [stderr] 144 |     let v2 = vec!["b", "v"];
[INFO] [stderr]     |         ^^ help: if this is intentional, prefix it with an underscore: `_v2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `first`
[INFO] [stderr]    --> src/main.rs:147:9
[INFO] [stderr]     |
[INFO] [stderr] 147 |     let first = &vector[0];
[INFO] [stderr]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `scores2`
[INFO] [stderr]    --> src/main.rs:192:13
[INFO] [stderr]     |
[INFO] [stderr] 192 |     let mut scores2: HashMap<_, _> = teams.iter().zip(init_scores.iter()).collect();
[INFO] [stderr]     |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_scores2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]    --> src/main.rs:238:9
[INFO] [stderr]     |
[INFO] [stderr] 238 |     let f = match f {
[INFO] [stderr]     |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `home`
[INFO] [stderr]    --> src/main.rs:272:9
[INFO] [stderr]     |
[INFO] [stderr] 272 |     let home: IPStd = "127.0.0.1".parse().unwrap();
[INFO] [stderr]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]    --> src/main.rs:274:9
[INFO] [stderr]     |
[INFO] [stderr] 274 |     let f = File::open("hello.txt")?.read_to_string(&mut s)?;
[INFO] [stderr]     |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `integer`
[INFO] [stderr]    --> src/main.rs:306:9
[INFO] [stderr]     |
[INFO] [stderr] 306 |     let integer = Point { x: 5, y: 10 };
[INFO] [stderr]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_integer`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `float`
[INFO] [stderr]    --> src/main.rs:307:9
[INFO] [stderr]     |
[INFO] [stderr] 307 |     let float = Point { x: 1.0, y: 2.0 };
[INFO] [stderr]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_float`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]    --> src/main.rs:398:9
[INFO] [stderr]     |
[INFO] [stderr] 398 |     let s: &'static str = "I have a static lifetime";
[INFO] [stderr]     |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/main.rs:413:9
[INFO] [stderr]     |
[INFO] [stderr] 413 |     let i = ImportantExcept {
[INFO] [stderr]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num`
[INFO] [stderr]    --> src/main.rs:467:49
[INFO] [stderr]     |
[INFO] [stderr] 467 |         let mut expensive_result = Cacher::new(|num| {
[INFO] [stderr]     |                                                 ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sum`
[INFO] [stderr]    --> src/main.rs:498:9
[INFO] [stderr]     |
[INFO] [stderr] 498 |     let sum: u32 = v1.iter().sum();
[INFO] [stderr]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `blablator`
[INFO] [stderr]    --> src/main.rs:500:9
[INFO] [stderr]     |
[INFO] [stderr] 500 |     let blablator: Vec<u32> = v1.iter().map(|x| x + 1).collect();
[INFO] [stderr]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_blablator`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sum`
[INFO] [stderr]    --> src/main.rs:501:9
[INFO] [stderr]     |
[INFO] [stderr] 501 |     let sum: u32 = v1.iter().sum();
[INFO] [stderr]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v1`
[INFO] [stderr]    --> src/main.rs:697:13
[INFO] [stderr]     |
[INFO] [stderr] 697 |         let v1 = c.value(1);
[INFO] [stderr]     |             ^^ help: if this is intentional, prefix it with an underscore: `_v1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `d`
[INFO] [stderr]    --> src/main.rs:756:13
[INFO] [stderr]     |
[INFO] [stderr] 756 |         let d = CustomSmartPointer {
[INFO] [stderr]     |             ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]    --> src/main.rs:775:17
[INFO] [stderr]     |
[INFO] [stderr] 775 |             let b = Cons(Rc::new(RefCell::new(3)), Rc::clone(&a));
[INFO] [stderr]     |                 ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]    --> src/main.rs:777:17
[INFO] [stderr]     |
[INFO] [stderr] 777 |             let c = Cons(Rc::new(RefCell::new(3)), Rc::clone(&a));
[INFO] [stderr]     |                 ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:141:9
[INFO] [stderr]     |
[INFO] [stderr] 141 |     let mut e = &mut v[1];
[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/main.rs:191:9
[INFO] [stderr]     |
[INFO] [stderr] 191 |     let mut init_scores = vec![10, 50];
[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/main.rs:192:9
[INFO] [stderr]     |
[INFO] [stderr] 192 |     let mut scores2: HashMap<_, _> = teams.iter().zip(init_scores.iter()).collect();
[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/main.rs:494:9
[INFO] [stderr]     |
[INFO] [stderr] 494 |     let mut v1 = vec![1, 2, 3];
[INFO] [stderr]     |         ----^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `area`
[INFO] [stderr]   --> src/main.rs:32:8
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn area(&self) -> u32 {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `height`
[INFO] [stderr]   --> src/main.rs:35:8
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn height(&self) -> u32 {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `double_height`
[INFO] [stderr]   --> src/main.rs:38:8
[INFO] [stderr]    |
[INFO] [stderr] 38 |     fn double_height(&mut self) {
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `can_hold`
[INFO] [stderr]   --> src/main.rs:41:8
[INFO] [stderr]    |
[INFO] [stderr] 41 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `name`
[INFO] [stderr]   --> src/main.rs:44:8
[INFO] [stderr]    |
[INFO] [stderr] 44 |     fn name() -> String {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `square`
[INFO] [stderr]   --> src/main.rs:47:8
[INFO] [stderr]    |
[INFO] [stderr] 47 |     fn square(size: u32) -> Rectangle {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `rectangle_test`
[INFO] [stderr]   --> src/main.rs:55:4
[INFO] [stderr]    |
[INFO] [stderr] 55 | fn rectangle_test() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V4`
[INFO] [stderr]   --> src/main.rs:85:5
[INFO] [stderr]    |
[INFO] [stderr] 85 |     V4,
[INFO] [stderr]    |     ^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V6`
[INFO] [stderr]   --> src/main.rs:86:5
[INFO] [stderr]    |
[INFO] [stderr] 86 |     V6,
[INFO] [stderr]    |     ^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V4`
[INFO] [stderr]   --> src/main.rs:97:5
[INFO] [stderr]    |
[INFO] [stderr] 97 |     V4(u8, u8, u8, u8),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V6`
[INFO] [stderr]   --> src/main.rs:98:5
[INFO] [stderr]    |
[INFO] [stderr] 98 |     V6(String),
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ip_test`
[INFO] [stderr]    --> src/main.rs:101:4
[INFO] [stderr]     |
[INFO] [stderr] 101 | fn ip_test() {
[INFO] [stderr]     |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `opt_test`
[INFO] [stderr]    --> src/main.rs:116:4
[INFO] [stderr]     |
[INFO] [stderr] 116 | fn opt_test() {
[INFO] [stderr]     |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `vec_test`
[INFO] [stderr]    --> src/main.rs:133:4
[INFO] [stderr]     |
[INFO] [stderr] 133 | fn vec_test() {
[INFO] [stderr]     |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `str_test`
[INFO] [stderr]    --> src/main.rs:168:4
[INFO] [stderr]     |
[INFO] [stderr] 168 | fn str_test() {
[INFO] [stderr]     |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `chars_test`
[INFO] [stderr]    --> src/main.rs:177:4
[INFO] [stderr]     |
[INFO] [stderr] 177 | fn chars_test() {
[INFO] [stderr]     |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `hashmap_test`
[INFO] [stderr]    --> src/main.rs:184:4
[INFO] [stderr]     |
[INFO] [stderr] 184 | fn hashmap_test() {
[INFO] [stderr]     |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ex1`
[INFO] [stderr]    --> src/main.rs:207:4
[INFO] [stderr]     |
[INFO] [stderr] 207 | fn ex1() {
[INFO] [stderr]     |    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `panic`
[INFO] [stderr]    --> src/main.rs:230:4
[INFO] [stderr]     |
[INFO] [stderr] 230 | fn panic() {
[INFO] [stderr]     |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `open_file`
[INFO] [stderr]    --> src/main.rs:235:4
[INFO] [stderr]     |
[INFO] [stderr] 235 | fn open_file() {
[INFO] [stderr]     |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file`
[INFO] [stderr]    --> src/main.rs:258:4
[INFO] [stderr]     |
[INFO] [stderr] 258 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file_with_question`
[INFO] [stderr]    --> src/main.rs:271:4
[INFO] [stderr]     |
[INFO] [stderr] 271 | fn read_username_from_file_with_question() -> Result<String, io::Error> {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `largest`
[INFO] [stderr]    --> src/main.rs:279:4
[INFO] [stderr]     |
[INFO] [stderr] 279 | fn largest<T: PartialOrd>(list: &[T]) -> &T {
[INFO] [stderr]     |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `struct_template`
[INFO] [stderr]    --> src/main.rs:290:4
[INFO] [stderr]     |
[INFO] [stderr] 290 | fn struct_template() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `traits_example`
[INFO] [stderr]    --> src/main.rs:310:4
[INFO] [stderr]     |
[INFO] [stderr] 310 | fn traits_example() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `conditional_traits`
[INFO] [stderr]    --> src/main.rs:354:4
[INFO] [stderr]     |
[INFO] [stderr] 354 | fn conditional_traits() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest`
[INFO] [stderr]    --> src/main.rs:379:4
[INFO] [stderr]     |
[INFO] [stderr] 379 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stderr]     |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ttl_test`
[INFO] [stderr]    --> src/main.rs:387:4
[INFO] [stderr]     |
[INFO] [stderr] 387 | fn ttl_test() {
[INFO] [stderr]     |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ttl_test2`
[INFO] [stderr]    --> src/main.rs:397:4
[INFO] [stderr]     |
[INFO] [stderr] 397 | fn ttl_test2() {
[INFO] [stderr]     |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generic_traits_ttl`
[INFO] [stderr]    --> src/main.rs:418:4
[INFO] [stderr]     |
[INFO] [stderr] 418 | fn generic_traits_ttl() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `closure_one`
[INFO] [stderr]    --> src/main.rs:465:4
[INFO] [stderr]     |
[INFO] [stderr] 465 | fn closure_one() {
[INFO] [stderr]     |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `iterators`
[INFO] [stderr]    --> src/main.rs:493:4
[INFO] [stderr]     |
[INFO] [stderr] 493 | fn iterators() {
[INFO] [stderr]     |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `threads_test`
[INFO] [stderr]    --> src/main.rs:615:4
[INFO] [stderr]     |
[INFO] [stderr] 615 | fn threads_test() {
[INFO] [stderr]     |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `channels_test`
[INFO] [stderr]    --> src/main.rs:633:4
[INFO] [stderr]     |
[INFO] [stderr] 633 | fn channels_test() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `mutex_test`
[INFO] [stderr]    --> src/main.rs:667:4
[INFO] [stderr]     |
[INFO] [stderr] 667 | fn mutex_test() {
[INFO] [stderr]     |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_test` (bin "rust_test" test) generated 70 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_test-3cc90ad056892dd3)
[INFO] [stdout] test test::call_with_differrent_values ... ok
[INFO] [stdout] test test::sends_an_over_75_perc ... ok
[INFO] [stdout] test test::test_drop ... ok
[INFO] [stdout] test test::test_boxes ... ok
[INFO] [stdout] test test::test_tree ... ok
[INFO] [stdout] test test::derefs_test ... ok
[INFO] [stdout] test test::using_other_iterator_trait_methods ... ok
[INFO] [stdout] test test::finds_in_size ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "27a207f23505550940f8c7181fc8ed26ffadc382a80b426a1b9cfd92a08126fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "27a207f23505550940f8c7181fc8ed26ffadc382a80b426a1b9cfd92a08126fe", kill_on_drop: false }`
[INFO] [stdout] 27a207f23505550940f8c7181fc8ed26ffadc382a80b426a1b9cfd92a08126fe