[INFO] cloning repository https://github.com/ChinKX/rust_workshop
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ChinKX/rust_workshop" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FChinKX%2Frust_workshop", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FChinKX%2Frust_workshop'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 211f62f03773a8baf9925da7863a21351598bb18
[INFO] checking ChinKX/rust_workshop against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FChinKX%2Frust_workshop" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ChinKX/rust_workshop on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ChinKX/rust_workshop
[INFO] finished tweaking git repo https://github.com/ChinKX/rust_workshop
[INFO] tweaked toml for git repo https://github.com/ChinKX/rust_workshop written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/ChinKX/rust_workshop already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8b239b55a81f06b06e1157317e44c8b9a88275c18b441e1bca8e718ec4d76782
[INFO] running `Command { std: "docker" "start" "-a" "8b239b55a81f06b06e1157317e44c8b9a88275c18b441e1bca8e718ec4d76782", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8b239b55a81f06b06e1157317e44c8b9a88275c18b441e1bca8e718ec4d76782", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b239b55a81f06b06e1157317e44c8b9a88275c18b441e1bca8e718ec4d76782", kill_on_drop: false }`
[INFO] [stdout] 8b239b55a81f06b06e1157317e44c8b9a88275c18b441e1bca8e718ec4d76782
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 997d7571f0d77f00da699bf64ef57a4e476a9c74ff48d58ab7a6bd885160950e
[INFO] running `Command { std: "docker" "start" "-a" "997d7571f0d77f00da699bf64ef57a4e476a9c74ff48d58ab7a6bd885160950e", kill_on_drop: false }`
[INFO] [stderr]     Checking hello v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/main.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let s: String = "hello world".to_string();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `spongebob`
[INFO] [stdout]   --> src/main.rs:67:13
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let mut spongebob = "hello world".to_string();
[INFO] [stdout]    |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_spongebob`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `humans`
[INFO] [stdout]    --> src/main.rs:173:9
[INFO] [stdout]     |
[INFO] [stdout] 173 |     let humans = vec![
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_humans`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mylist`
[INFO] [stdout]    --> src/main.rs:339:9
[INFO] [stdout]     |
[INFO] [stdout] 339 |     let mylist: List<u32> = List::Nil;
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_mylist`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/main.rs:341:9
[INFO] [stdout]     |
[INFO] [stdout] 341 |     let y = *x + 2;
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `shape2`
[INFO] [stdout]    --> src/main.rs:350:9
[INFO] [stdout]     |
[INFO] [stdout] 350 |     let shape2 = BadShape {
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_shape2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `shape0`
[INFO] [stdout]    --> src/main.rs:357:9
[INFO] [stdout]     |
[INFO] [stdout] 357 |     let shape0 = Shape::Circle { radius: 32.0 };
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_shape0`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:368:9
[INFO] [stdout]     |
[INFO] [stdout] 368 |     let x = match shape.radius {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]    --> src/main.rs:372:9
[INFO] [stdout]     |
[INFO] [stdout] 372 |     let hello = if true { "hello" } else { "world" };
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:373:9
[INFO] [stdout]     |
[INFO] [stdout] 373 |     let x = {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x_`
[INFO] [stdout]    --> src/main.rs:380:9
[INFO] [stdout]     |
[INFO] [stdout] 380 |     let x_ = shape
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_x_`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `account`
[INFO] [stdout]    --> src/main.rs:488:18
[INFO] [stdout]     |
[INFO] [stdout] 488 | fn debit_account(account: &Account, amount: f32) -> Result<f32, String> {
[INFO] [stdout]     |                  ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_account`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `amount`
[INFO] [stdout]    --> src/main.rs:488:37
[INFO] [stdout]     |
[INFO] [stdout] 488 | fn debit_account(account: &Account, amount: f32) -> Result<f32, String> {
[INFO] [stdout]     |                                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_amount`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]    --> src/main.rs:514:9
[INFO] [stdout]     |
[INFO] [stdout] 514 |     let result = withdraw_account(from_account, amount)?;
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let mut spongebob = "hello world".to_string();
[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 is never used: `print_string_1`
[INFO] [stdout]    --> src/main.rs:101:4
[INFO] [stdout]     |
[INFO] [stdout] 101 | fn print_string_1<'s>(s: &'s String) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_string_2`
[INFO] [stdout]    --> src/main.rs:107:4
[INFO] [stdout]     |
[INFO] [stdout] 107 | fn print_string_2(s: &String) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `append_krab_2`
[INFO] [stdout]    --> src/main.rs:126:4
[INFO] [stdout]     |
[INFO] [stdout] 126 | fn append_krab_2(a: &mut String, b: &mut String) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Rectangle`
[INFO] [stdout]    --> src/main.rs:141:5
[INFO] [stdout]     |
[INFO] [stdout] 141 |     Rectangle { side: f32, length: f32 },
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/main.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let s: String = "hello world".to_string();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Triangle`
[INFO] [stdout]    --> src/main.rs:142:5
[INFO] [stdout]     |
[INFO] [stdout] 142 |     Triangle { base: f32, height: f32 },
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `TwoShapes`
[INFO] [stdout]    --> src/main.rs:143:5
[INFO] [stdout]     |
[INFO] [stdout] 143 |     TwoShapes(Box<Shape>, Box<Shape>),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Boolean`
[INFO] [stdout]    --> src/main.rs:147:6
[INFO] [stdout]     |
[INFO] [stdout] 147 | enum Boolean {
[INFO] [stdout]     |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Color`
[INFO] [stdout]    --> src/main.rs:153:6
[INFO] [stdout]     |
[INFO] [stdout] 153 | enum Color {
[INFO] [stdout]     |      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `spongebob`
[INFO] [stdout]   --> src/main.rs:67:13
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let mut spongebob = "hello world".to_string();
[INFO] [stdout]    |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_spongebob`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Human`
[INFO] [stdout]    --> src/main.rs:161:8
[INFO] [stdout]     |
[INFO] [stdout] 161 | struct Human {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Human2`
[INFO] [stdout]    --> src/main.rs:166:1
[INFO] [stdout]     |
[INFO] [stdout] 166 | type Human2 = (String, String); // tuple
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Human3`
[INFO] [stdout]    --> src/main.rs:168:8
[INFO] [stdout]     |
[INFO] [stdout] 168 | struct Human3 {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `possible_humans`
[INFO] [stdout]    --> src/main.rs:172:4
[INFO] [stdout]     |
[INFO] [stdout] 172 | fn possible_humans() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Human12`
[INFO] [stdout]    --> src/main.rs:194:8
[INFO] [stdout]     |
[INFO] [stdout] 194 | struct Human12 {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Human22`
[INFO] [stdout]    --> src/main.rs:201:1
[INFO] [stdout]     |
[INFO] [stdout] 201 | type Human22 = (Boolean, Boolean, Color);
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_red_crazy_short_human_normal`
[INFO] [stdout]    --> src/main.rs:204:4
[INFO] [stdout]     |
[INFO] [stdout] 204 | fn is_red_crazy_short_human_normal(human: Human12) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_red_crazy_short_human_better`
[INFO] [stdout]    --> src/main.rs:223:4
[INFO] [stdout]     |
[INFO] [stdout] 223 | fn is_red_crazy_short_human_better(human: Human12) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_red_crazy_short_human22_better`
[INFO] [stdout]    --> src/main.rs:234:4
[INFO] [stdout]     |
[INFO] [stdout] 234 | fn is_red_crazy_short_human22_better(human: Human22) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_two_circle_normal`
[INFO] [stdout]    --> src/main.rs:254:4
[INFO] [stdout]     |
[INFO] [stdout] 254 | fn is_two_circle_normal(shape: Shape) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_two_circle_better`
[INFO] [stdout]    --> src/main.rs:270:4
[INFO] [stdout]     |
[INFO] [stdout] 270 | fn is_two_circle_better(shape: Shape) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_two_big_circles_normal`
[INFO] [stdout]    --> src/main.rs:283:4
[INFO] [stdout]     |
[INFO] [stdout] 283 | fn is_two_big_circles_normal(shape: Shape) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `humans`
[INFO] [stdout]    --> src/main.rs:173:9
[INFO] [stdout]     |
[INFO] [stdout] 173 |     let humans = vec![
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_humans`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_two_big_circles_better`
[INFO] [stdout]    --> src/main.rs:300:4
[INFO] [stdout]     |
[INFO] [stdout] 300 | fn is_two_big_circles_better(shape: Shape) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `BadShape`
[INFO] [stdout]    --> src/main.rs:321:8
[INFO] [stdout]     |
[INFO] [stdout] 321 | struct BadShape {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `List`
[INFO] [stdout]    --> src/main.rs:327:6
[INFO] [stdout]     |
[INFO] [stdout] 327 | enum List<T> {
[INFO] [stdout]     |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `foo`
[INFO] [stdout]    --> src/main.rs:337:4
[INFO] [stdout]     |
[INFO] [stdout] 337 | fn foo() {
[INFO] [stdout]     |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area_1`
[INFO] [stdout]    --> src/main.rs:391:4
[INFO] [stdout]     |
[INFO] [stdout] 391 | fn area_1(shape: BadShape) -> f32 {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area_12`
[INFO] [stdout]    --> src/main.rs:414:4
[INFO] [stdout]     |
[INFO] [stdout] 414 | fn area_12(shape: Shape) -> f32 {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `factorial2`
[INFO] [stdout]    --> src/main.rs:440:4
[INFO] [stdout]     |
[INFO] [stdout] 440 | fn factorial2(mut n: usize) -> usize {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `factorial3`
[INFO] [stdout]    --> src/main.rs:453:4
[INFO] [stdout]     |
[INFO] [stdout] 453 | fn factorial3(mut n: usize) -> usize {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Account`
[INFO] [stdout]    --> src/main.rs:465:8
[INFO] [stdout]     |
[INFO] [stdout] 465 | struct Account {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `withdraw_account`
[INFO] [stdout]    --> src/main.rs:470:4
[INFO] [stdout]     |
[INFO] [stdout] 470 | fn withdraw_account(account: Account, amount: f32) -> Result<f32, String> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `debit_account`
[INFO] [stdout]    --> src/main.rs:488:4
[INFO] [stdout]     |
[INFO] [stdout] 488 | fn debit_account(account: &Account, amount: f32) -> Result<f32, String> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `transfer_amount_1`
[INFO] [stdout]    --> src/main.rs:492:4
[INFO] [stdout]     |
[INFO] [stdout] 492 | fn transfer_amount_1(
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `transfer_amount_2`
[INFO] [stdout]    --> src/main.rs:509:4
[INFO] [stdout]     |
[INFO] [stdout] 509 | fn transfer_amount_2(
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mylist`
[INFO] [stdout]    --> src/main.rs:339:9
[INFO] [stdout]     |
[INFO] [stdout] 339 |     let mylist: List<u32> = List::Nil;
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_mylist`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/main.rs:341:9
[INFO] [stdout]     |
[INFO] [stdout] 341 |     let y = *x + 2;
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `shape2`
[INFO] [stdout]    --> src/main.rs:350:9
[INFO] [stdout]     |
[INFO] [stdout] 350 |     let shape2 = BadShape {
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_shape2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `shape0`
[INFO] [stdout]    --> src/main.rs:357:9
[INFO] [stdout]     |
[INFO] [stdout] 357 |     let shape0 = Shape::Circle { radius: 32.0 };
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_shape0`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:368:9
[INFO] [stdout]     |
[INFO] [stdout] 368 |     let x = match shape.radius {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]    --> src/main.rs:372:9
[INFO] [stdout]     |
[INFO] [stdout] 372 |     let hello = if true { "hello" } else { "world" };
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:373:9
[INFO] [stdout]     |
[INFO] [stdout] 373 |     let x = {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x_`
[INFO] [stdout]    --> src/main.rs:380:9
[INFO] [stdout]     |
[INFO] [stdout] 380 |     let x_ = shape
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_x_`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `account`
[INFO] [stdout]    --> src/main.rs:488:18
[INFO] [stdout]     |
[INFO] [stdout] 488 | fn debit_account(account: &Account, amount: f32) -> Result<f32, String> {
[INFO] [stdout]     |                  ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_account`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `amount`
[INFO] [stdout]    --> src/main.rs:488:37
[INFO] [stdout]     |
[INFO] [stdout] 488 | fn debit_account(account: &Account, amount: f32) -> Result<f32, String> {
[INFO] [stdout]     |                                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_amount`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]    --> src/main.rs:514:9
[INFO] [stdout]     |
[INFO] [stdout] 514 |     let result = withdraw_account(from_account, amount)?;
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let mut spongebob = "hello world".to_string();
[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 is never used: `print_string_1`
[INFO] [stdout]    --> src/main.rs:101:4
[INFO] [stdout]     |
[INFO] [stdout] 101 | fn print_string_1<'s>(s: &'s String) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_string_2`
[INFO] [stdout]    --> src/main.rs:107:4
[INFO] [stdout]     |
[INFO] [stdout] 107 | fn print_string_2(s: &String) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `append_krab_2`
[INFO] [stdout]    --> src/main.rs:126:4
[INFO] [stdout]     |
[INFO] [stdout] 126 | fn append_krab_2(a: &mut String, b: &mut String) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Rectangle`
[INFO] [stdout]    --> src/main.rs:141:5
[INFO] [stdout]     |
[INFO] [stdout] 141 |     Rectangle { side: f32, length: f32 },
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Triangle`
[INFO] [stdout]    --> src/main.rs:142:5
[INFO] [stdout]     |
[INFO] [stdout] 142 |     Triangle { base: f32, height: f32 },
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `TwoShapes`
[INFO] [stdout]    --> src/main.rs:143:5
[INFO] [stdout]     |
[INFO] [stdout] 143 |     TwoShapes(Box<Shape>, Box<Shape>),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Boolean`
[INFO] [stdout]    --> src/main.rs:147:6
[INFO] [stdout]     |
[INFO] [stdout] 147 | enum Boolean {
[INFO] [stdout]     |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Color`
[INFO] [stdout]    --> src/main.rs:153:6
[INFO] [stdout]     |
[INFO] [stdout] 153 | enum Color {
[INFO] [stdout]     |      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Human`
[INFO] [stdout]    --> src/main.rs:161:8
[INFO] [stdout]     |
[INFO] [stdout] 161 | struct Human {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Human2`
[INFO] [stdout]    --> src/main.rs:166:1
[INFO] [stdout]     |
[INFO] [stdout] 166 | type Human2 = (String, String); // tuple
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Human3`
[INFO] [stdout]    --> src/main.rs:168:8
[INFO] [stdout]     |
[INFO] [stdout] 168 | struct Human3 {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `possible_humans`
[INFO] [stdout]    --> src/main.rs:172:4
[INFO] [stdout]     |
[INFO] [stdout] 172 | fn possible_humans() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Human12`
[INFO] [stdout]    --> src/main.rs:194:8
[INFO] [stdout]     |
[INFO] [stdout] 194 | struct Human12 {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Human22`
[INFO] [stdout]    --> src/main.rs:201:1
[INFO] [stdout]     |
[INFO] [stdout] 201 | type Human22 = (Boolean, Boolean, Color);
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_red_crazy_short_human_normal`
[INFO] [stdout]    --> src/main.rs:204:4
[INFO] [stdout]     |
[INFO] [stdout] 204 | fn is_red_crazy_short_human_normal(human: Human12) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 48 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_red_crazy_short_human_better`
[INFO] [stdout]    --> src/main.rs:223:4
[INFO] [stdout]     |
[INFO] [stdout] 223 | fn is_red_crazy_short_human_better(human: Human12) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_red_crazy_short_human22_better`
[INFO] [stdout]    --> src/main.rs:234:4
[INFO] [stdout]     |
[INFO] [stdout] 234 | fn is_red_crazy_short_human22_better(human: Human22) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_two_circle_normal`
[INFO] [stdout]    --> src/main.rs:254:4
[INFO] [stdout]     |
[INFO] [stdout] 254 | fn is_two_circle_normal(shape: Shape) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_two_circle_better`
[INFO] [stdout]    --> src/main.rs:270:4
[INFO] [stdout]     |
[INFO] [stdout] 270 | fn is_two_circle_better(shape: Shape) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_two_big_circles_normal`
[INFO] [stdout]    --> src/main.rs:283:4
[INFO] [stdout]     |
[INFO] [stdout] 283 | fn is_two_big_circles_normal(shape: Shape) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_two_big_circles_better`
[INFO] [stdout]    --> src/main.rs:300:4
[INFO] [stdout]     |
[INFO] [stdout] 300 | fn is_two_big_circles_better(shape: Shape) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `BadShape`
[INFO] [stdout]    --> src/main.rs:321:8
[INFO] [stdout]     |
[INFO] [stdout] 321 | struct BadShape {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `List`
[INFO] [stdout]    --> src/main.rs:327:6
[INFO] [stdout]     |
[INFO] [stdout] 327 | enum List<T> {
[INFO] [stdout]     |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `foo`
[INFO] [stdout]    --> src/main.rs:337:4
[INFO] [stdout]     |
[INFO] [stdout] 337 | fn foo() {
[INFO] [stdout]     |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area_1`
[INFO] [stdout]    --> src/main.rs:391:4
[INFO] [stdout]     |
[INFO] [stdout] 391 | fn area_1(shape: BadShape) -> f32 {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area_12`
[INFO] [stdout]    --> src/main.rs:414:4
[INFO] [stdout]     |
[INFO] [stdout] 414 | fn area_12(shape: Shape) -> f32 {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `factorial2`
[INFO] [stdout]    --> src/main.rs:440:4
[INFO] [stdout]     |
[INFO] [stdout] 440 | fn factorial2(mut n: usize) -> usize {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `factorial3`
[INFO] [stdout]    --> src/main.rs:453:4
[INFO] [stdout]     |
[INFO] [stdout] 453 | fn factorial3(mut n: usize) -> usize {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Account`
[INFO] [stdout]    --> src/main.rs:465:8
[INFO] [stdout]     |
[INFO] [stdout] 465 | struct Account {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `withdraw_account`
[INFO] [stdout]    --> src/main.rs:470:4
[INFO] [stdout]     |
[INFO] [stdout] 470 | fn withdraw_account(account: Account, amount: f32) -> Result<f32, String> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `debit_account`
[INFO] [stdout]    --> src/main.rs:488:4
[INFO] [stdout]     |
[INFO] [stdout] 488 | fn debit_account(account: &Account, amount: f32) -> Result<f32, String> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `transfer_amount_1`
[INFO] [stdout]    --> src/main.rs:492:4
[INFO] [stdout]     |
[INFO] [stdout] 492 | fn transfer_amount_1(
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `transfer_amount_2`
[INFO] [stdout]    --> src/main.rs:509:4
[INFO] [stdout]     |
[INFO] [stdout] 509 | fn transfer_amount_2(
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 48 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.21s
[INFO] running `Command { std: "docker" "inspect" "997d7571f0d77f00da699bf64ef57a4e476a9c74ff48d58ab7a6bd885160950e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "997d7571f0d77f00da699bf64ef57a4e476a9c74ff48d58ab7a6bd885160950e", kill_on_drop: false }`
[INFO] [stdout] 997d7571f0d77f00da699bf64ef57a4e476a9c74ff48d58ab7a6bd885160950e