[INFO] cloning repository https://github.com/den0206/hello_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/den0206/hello_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fden0206%2Fhello_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fden0206%2Fhello_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9937c41d3392b5702924ea08b0eb20a683e46c2a
[INFO] checking den0206/hello_rust against try#a8425075041d4b9af9bf32e2a267dfb9db2cfffb for pr-100043-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fden0206%2Fhello_rust" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/den0206/hello_rust on toolchain a8425075041d4b9af9bf32e2a267dfb9db2cfffb
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a8425075041d4b9af9bf32e2a267dfb9db2cfffb" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/den0206/hello_rust
[INFO] finished tweaking git repo https://github.com/den0206/hello_rust
[INFO] tweaked toml for git repo https://github.com/den0206/hello_rust written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/den0206/hello_rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a8425075041d4b9af9bf32e2a267dfb9db2cfffb" "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-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:824c28ce115f6b999260af6986f3384c158e782489540e41c0b698ca1d9fd927" "/opt/rustwide/cargo-home/bin/cargo" "+a8425075041d4b9af9bf32e2a267dfb9db2cfffb" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 42a8cd22d8b6e865076b0749309952b140a23db409ef68a027fa016bb7f2b4ab
[INFO] running `Command { std: "docker" "start" "-a" "42a8cd22d8b6e865076b0749309952b140a23db409ef68a027fa016bb7f2b4ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "42a8cd22d8b6e865076b0749309952b140a23db409ef68a027fa016bb7f2b4ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "42a8cd22d8b6e865076b0749309952b140a23db409ef68a027fa016bb7f2b4ab", kill_on_drop: false }`
[INFO] [stdout] 42a8cd22d8b6e865076b0749309952b140a23db409ef68a027fa016bb7f2b4ab
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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@sha256:824c28ce115f6b999260af6986f3384c158e782489540e41c0b698ca1d9fd927" "/opt/rustwide/cargo-home/bin/cargo" "+a8425075041d4b9af9bf32e2a267dfb9db2cfffb" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a6ad3c082adf818523ccbfa40f43d24ed9435ea246e8d4114cdbf596de231b84
[INFO] running `Command { std: "docker" "start" "-a" "a6ad3c082adf818523ccbfa40f43d24ed9435ea246e8d4114cdbf596de231b84", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.124
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.16
[INFO] [stderr]     Checking getrandom v0.2.6
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking hello_cargo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `linux`
[INFO] [stdout]  --> src/enums.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let linux = OS::Linux(1991, String::from("linux"));
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_linux`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `windows`
[INFO] [stdout]  --> src/enums.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let windows = OS::Windows(1995, String::from("Microsoft"));
[INFO] [stdout]   |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_windows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p2`
[INFO] [stdout]   --> src/generics.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let p2 = Point { x: 1.0, y: 2 };
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_p2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sl2`
[INFO] [stdout]   --> src/ownership.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let sl2 = sl1;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_sl2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/ownership.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let r1 = &mut s11;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `linux`
[INFO] [stdout]  --> src/enums.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let linux = OS::Linux(1991, String::from("linux"));
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_linux`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `windows`
[INFO] [stdout]  --> src/enums.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let windows = OS::Windows(1995, String::from("Microsoft"));
[INFO] [stdout]   |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_windows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v2`
[INFO] [stdout]   --> src/stack_heap.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let v2 = vec![5, 6, 7, 8];
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_v2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p2`
[INFO] [stdout]   --> src/generics.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let p2 = Point { x: 1.0, y: 2 };
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_p2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sl2`
[INFO] [stdout]   --> src/ownership.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let sl2 = sl1;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_sl2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/ownership.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let r1 = &mut s11;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v2`
[INFO] [stdout]   --> src/stack_heap.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let v2 = vec![5, 6, 7, 8];
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_v2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str2`
[INFO] [stdout]   --> src/vars.rs:46:13
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let mut str2: String = String::from("Hello World");
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_str2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str2`
[INFO] [stdout]   --> src/vars.rs:46:13
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let mut str2: String = String::from("Hello World");
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_str2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/vars.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let mut str2: String = String::from("Hello World");
[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: enum `OS` is never used
[INFO] [stdout]  --> src/enums.rs:1:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | enum OS {
[INFO] [stdout]   |      ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]  --> src/enums.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_os_info` is never used
[INFO] [stdout]   --> src/enums.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn print_os_info(os: OS) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]  --> src/error_handling.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `division_option` is never used
[INFO] [stdout]   --> src/error_handling.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn division_option(x: f64, y: f64) -> Option<f64> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `division_result` is never used
[INFO] [stdout]   --> src/error_handling.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn division_result(x: f64, y: f64) -> Result<f64, String> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum` is never used
[INFO] [stdout]   --> src/error_handling.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn sum(array: &[i32]) -> Option<i32> {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]  --> src/generics.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Point<T, U> {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]  --> src/generics.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largist` is never used
[INFO] [stdout]   --> src/generics.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn largist<T: PartialOrd + Copy>(list: Vec<T>) -> T {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]  --> src/lifetime.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_longest` is never used
[INFO] [stdout]   --> src/lifetime.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn get_longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]  --> src/ownership.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:39:4
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn take_ownership(s: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_giveback_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:43:4
[INFO] [stdout]    |
[INFO] [stdout] 43 | fn take_giveback_ownership(s: String) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `caluculate_length` is never used
[INFO] [stdout]   --> src/ownership.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn caluculate_length(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `change` is never used
[INFO] [stdout]   --> src/ownership.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn change(s: &mut String) {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]  --> src/stack_heap.rs:1:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | enum List {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]  --> src/stack_heap.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `user_name`, `email`, `sign_in_count` and `active` are never read
[INFO] [stdout]  --> src/structs.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct User {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 3 |     user_name: String,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 4 |     email: String,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 5 |     sign_in_count: u64,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 6 |     active: bool,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `User` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `width` and `height` are never read
[INFO] [stdout]   --> src/structs.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct Rectangle {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 11 |     width: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 12 |     height: 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] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/structs.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub fn run() {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_user` is never used
[INFO] [stdout]   --> src/structs.rs:46:4
[INFO] [stdout]    |
[INFO] [stdout] 46 | fn build_user(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `create` is never used
[INFO] [stdout]   --> src/structs.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn create(width: u32, height: u32) -> Self {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `area` is never used
[INFO] [stdout]   --> src/structs.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn area(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]   --> src/traits.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 31 | struct Article {
[INFO] [stdout]    |        ------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 35 |     content: String,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/traits.rs:62:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | pub fn run() {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_price` is never used
[INFO] [stdout]   --> src/traits.rs:88:4
[INFO] [stdout]    |
[INFO] [stdout] 88 | fn get_price<T: Fruits>(fruit: T) {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify` is never used
[INFO] [stdout]   --> src/traits.rs:92:4
[INFO] [stdout]    |
[INFO] [stdout] 92 | fn notify(item: &impl Summary) {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_another` is never used
[INFO] [stdout]   --> src/traits.rs:96:4
[INFO] [stdout]    |
[INFO] [stdout] 96 | fn notify_another(item: &(impl Summary + Message)) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `double_value` is never used
[INFO] [stdout]   --> src/unit_test.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn double_value(a: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/vars.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let mut str2: String = String::from("Hello World");
[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: function `greeting` is never used
[INFO] [stdout]   --> src/unit_test.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn greeting(s: &str) -> String {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `MAX_POINTS` is never used
[INFO] [stdout]  --> src/vars.rs:3:7
[INFO] [stdout]   |
[INFO] [stdout] 3 | const MAX_POINTS: u32 = 100_000;
[INFO] [stdout]   |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]  --> src/vars.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `OS` is never used
[INFO] [stdout]  --> src/enums.rs:1:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | enum OS {
[INFO] [stdout]   |      ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]  --> src/enums.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_os_info` is never used
[INFO] [stdout]   --> src/enums.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn print_os_info(os: OS) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]  --> src/error_handling.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `division_option` is never used
[INFO] [stdout]   --> src/error_handling.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn division_option(x: f64, y: f64) -> Option<f64> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `division_result` is never used
[INFO] [stdout]   --> src/error_handling.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn division_result(x: f64, y: f64) -> Result<f64, String> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum` is never used
[INFO] [stdout]   --> src/error_handling.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn sum(array: &[i32]) -> Option<i32> {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]  --> src/generics.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Point<T, U> {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]  --> src/generics.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largist` is never used
[INFO] [stdout]   --> src/generics.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn largist<T: PartialOrd + Copy>(list: Vec<T>) -> T {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]  --> src/lifetime.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_longest` is never used
[INFO] [stdout]   --> src/lifetime.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn get_longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]  --> src/ownership.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:39:4
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn take_ownership(s: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_giveback_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:43:4
[INFO] [stdout]    |
[INFO] [stdout] 43 | fn take_giveback_ownership(s: String) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `caluculate_length` is never used
[INFO] [stdout]   --> src/ownership.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn caluculate_length(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `change` is never used
[INFO] [stdout]   --> src/ownership.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn change(s: &mut String) {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]  --> src/stack_heap.rs:1:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | enum List {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]  --> src/stack_heap.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `user_name`, `email`, `sign_in_count` and `active` are never read
[INFO] [stdout]  --> src/structs.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct User {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 3 |     user_name: String,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 4 |     email: String,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 5 |     sign_in_count: u64,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 6 |     active: bool,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `User` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `width` and `height` are never read
[INFO] [stdout]   --> src/structs.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct Rectangle {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 11 |     width: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 12 |     height: 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] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/structs.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub fn run() {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_user` is never used
[INFO] [stdout]   --> src/structs.rs:46:4
[INFO] [stdout]    |
[INFO] [stdout] 46 | fn build_user(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `create` is never used
[INFO] [stdout]   --> src/structs.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn create(width: u32, height: u32) -> Self {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `area` is never used
[INFO] [stdout]   --> src/structs.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn area(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]   --> src/traits.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 31 | struct Article {
[INFO] [stdout]    |        ------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 35 |     content: String,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/traits.rs:62:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | pub fn run() {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_price` is never used
[INFO] [stdout]   --> src/traits.rs:88:4
[INFO] [stdout]    |
[INFO] [stdout] 88 | fn get_price<T: Fruits>(fruit: T) {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify` is never used
[INFO] [stdout]   --> src/traits.rs:92:4
[INFO] [stdout]    |
[INFO] [stdout] 92 | fn notify(item: &impl Summary) {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_another` is never used
[INFO] [stdout]   --> src/traits.rs:96:4
[INFO] [stdout]    |
[INFO] [stdout] 96 | fn notify_another(item: &(impl Summary + Message)) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `MAX_POINTS` is never used
[INFO] [stdout]  --> src/vars.rs:3:7
[INFO] [stdout]   |
[INFO] [stdout] 3 | const MAX_POINTS: u32 = 100_000;
[INFO] [stdout]   |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]  --> src/vars.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 42 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 40 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.60s
[INFO] running `Command { std: "docker" "inspect" "a6ad3c082adf818523ccbfa40f43d24ed9435ea246e8d4114cdbf596de231b84", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a6ad3c082adf818523ccbfa40f43d24ed9435ea246e8d4114cdbf596de231b84", kill_on_drop: false }`
[INFO] [stdout] a6ad3c082adf818523ccbfa40f43d24ed9435ea246e8d4114cdbf596de231b84