[INFO] fetching crate fust_tutorials 0.1.0...
[INFO] checking fust_tutorials-0.1.0 against master#8c32e313cccf7df531e2d49ffb8227bb92304aee for pr-145608-1
[INFO] extracting crate fust_tutorials 0.1.0 into /workspace/builds/worker-5-tc1/source
[INFO] started tweaking crates.io crate fust_tutorials 0.1.0
[INFO] finished tweaking crates.io crate fust_tutorials 0.1.0
[INFO] tweaked toml for crates.io crate fust_tutorials 0.1.0 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate fust_tutorials 0.1.0 on toolchain 8c32e313cccf7df531e2d49ffb8227bb92304aee
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate fust_tutorials 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 84a4f42e2d11879b998b3a2f04e07fecddb8ae5255bce7181b4c95c51a32a86a
[INFO] running `Command { std: "docker" "start" "-a" "84a4f42e2d11879b998b3a2f04e07fecddb8ae5255bce7181b4c95c51a32a86a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "84a4f42e2d11879b998b3a2f04e07fecddb8ae5255bce7181b4c95c51a32a86a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "84a4f42e2d11879b998b3a2f04e07fecddb8ae5255bce7181b4c95c51a32a86a", kill_on_drop: false }`
[INFO] [stdout] 84a4f42e2d11879b998b3a2f04e07fecddb8ae5255bce7181b4c95c51a32a86a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+8c32e313cccf7df531e2d49ffb8227bb92304aee" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8af9a86489a8a54011cb47dc65c33fe114b81cc8f516df83c39f84c6379ea700
[INFO] running `Command { std: "docker" "start" "-a" "8af9a86489a8a54011cb47dc65c33fe114b81cc8f516df83c39f84c6379ea700", kill_on_drop: false }`
[INFO] [stderr]     Checking fust_tutorials v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `News` is never constructed
[INFO] [stdout]   --> src/lib.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | struct News {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `seat_at_table` is never used
[INFO] [stdout]  --> src/front_of_house.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 |     fn seat_at_table() {}
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_order` is never used
[INFO] [stdout]  --> src/front_of_house.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn take_order(){}
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `serve_order` is never used
[INFO] [stdout]  --> src/front_of_house.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn serve_order(){}
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_payment` is never used
[INFO] [stdout]   --> src/front_of_house.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn take_payment(){}
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]  --> src/guess.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Guess {
[INFO] [stdout]   |            ----- field in this struct
[INFO] [stdout] 2 |     value: i32
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `News` is never constructed
[INFO] [stdout]   --> src/lib.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | struct News {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `can_hold` is never used
[INFO] [stdout]   --> src/lib.rs:71:8
[INFO] [stdout]    |
[INFO] [stdout] 61 | impl Rectangle {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 71 |     fn can_hold(&self, other: &Self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `seat_at_table` is never used
[INFO] [stdout]  --> src/front_of_house.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 |     fn seat_at_table() {}
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_order` is never used
[INFO] [stdout]  --> src/front_of_house.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn take_order(){}
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `serve_order` is never used
[INFO] [stdout]  --> src/front_of_house.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn serve_order(){}
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_payment` is never used
[INFO] [stdout]   --> src/front_of_house.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn take_payment(){}
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Guess` is never constructed
[INFO] [stdout]  --> src/guess.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Guess {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]  --> src/guess.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl Guess {
[INFO] [stdout]   | ---------- associated function in this implementation
[INFO] [stdout] 7 |     pub fn new(value: i32) -> Guess {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let x = 5;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `three`
[INFO] [stdout]    --> src/main.rs:202:9
[INFO] [stdout]     |
[INFO] [stdout] 202 |     let three = User {
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_three`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/main.rs:251:9
[INFO] [stdout]     |
[INFO] [stdout] 251 |     let y = back(x);
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:277:27
[INFO] [stdout]     |
[INFO] [stdout] 277 |             Message::Move{x, y} => "move",
[INFO] [stdout]     |                           ^ help: try ignoring the field: `x: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/main.rs:277:30
[INFO] [stdout]     |
[INFO] [stdout] 277 |             Message::Move{x, y} => "move",
[INFO] [stdout]     |                              ^ help: try ignoring the field: `y: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:295:9
[INFO] [stdout]     |
[INFO] [stdout] 295 |     let x = if let Some(i) = some_num {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `first`
[INFO] [stdout]    --> src/main.rs:308:9
[INFO] [stdout]     |
[INFO] [stdout] 308 |     let first = &v[0];
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ans`
[INFO] [stdout]    --> src/main.rs:348:9
[INFO] [stdout]     |
[INFO] [stdout] 348 |     let ans = &hello[0..2]; // 慎用，用可能 panic
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_ans`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/main.rs:369:9
[INFO] [stdout]     |
[INFO] [stdout] 369 |     let value = scores.get("Blue");
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `score`
[INFO] [stdout]    --> src/main.rs:376:13
[INFO] [stdout]     |
[INFO] [stdout] 376 |     let mut score: HashMap<_, _> = teams.into_iter().zip(initial_scores.into_iter()).collect();
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:376:9
[INFO] [stdout]     |
[INFO] [stdout] 376 |     let mut score: HashMap<_, _> = teams.into_iter().zip(initial_scores.into_iter()).collect();
[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: unused variable: `t`
[INFO] [stdout]    --> src/main.rs:499:20
[INFO] [stdout]     |
[INFO] [stdout] 499 | fn some_func<T, U>(t: &T, u: &U) -> i32 
[INFO] [stdout]     |                    ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]    --> src/main.rs:499:27
[INFO] [stdout]     |
[INFO] [stdout] 499 | fn some_func<T, U>(t: &T, u: &U) -> i32 
[INFO] [stdout]     |                           ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `excerpt`
[INFO] [stdout]    --> src/main.rs:526:9
[INFO] [stdout]     |
[INFO] [stdout] 526 |     let excerpt = Excerpt {
[INFO] [stdout]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_excerpt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `typeofdata` is never used
[INFO] [stdout]   --> src/main.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn typeofdata() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `arra_y` is never used
[INFO] [stdout]   --> src/main.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn arra_y() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `label` is never used
[INFO] [stdout]   --> src/main.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn label() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `use_while` is never used
[INFO] [stdout]   --> src/main.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn use_while() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `ChangeColor` are never constructed
[INFO] [stdout]    --> src/main.rs:266:5
[INFO] [stdout]     |
[INFO] [stdout] 265 | enum Message {
[INFO] [stdout]     |      ------- variants in this enum
[INFO] [stdout] 266 |     Quit,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 267 |     Move { x: i32, y: i32 },
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 268 |     Write(String),
[INFO] [stdout] 269 |     ChangeColor(i32, i32, i32),
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `module` is never used
[INFO] [stdout]    --> src/main.rs:302:4
[INFO] [stdout]     |
[INFO] [stdout] 302 | fn module() {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_handle_with_wrap_helper` is never used
[INFO] [stdout]    --> src/main.rs:419:4
[INFO] [stdout]     |
[INFO] [stdout] 419 | fn error_handle_with_wrap_helper(file: &str) -> Result<String, io::Error> { // 枚举是一个范型, 范型用<>
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_handle_with_wrap` is never used
[INFO] [stdout]    --> src/main.rs:453:4
[INFO] [stdout]     |
[INFO] [stdout] 453 | fn error_handle_with_wrap() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_func` is never used
[INFO] [stdout]    --> src/main.rs:499:4
[INFO] [stdout]     |
[INFO] [stdout] 499 | fn some_func<T, U>(t: &T, u: &U) -> i32 
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `part` is never read
[INFO] [stdout]    --> src/main.rs:520:5
[INFO] [stdout]     |
[INFO] [stdout] 519 | struct Excerpt<'a> {
[INFO] [stdout]     |        ------- field in this struct
[INFO] [stdout] 520 |     part: &'a str,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]    --> src/main.rs:531:4
[INFO] [stdout]     |
[INFO] [stdout] 531 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cacher` is never constructed
[INFO] [stdout]    --> src/main.rs:565:8
[INFO] [stdout]     |
[INFO] [stdout] 565 | struct Cacher<T, U> 
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `get_value` are never used
[INFO] [stdout]    --> src/main.rs:578:8
[INFO] [stdout]     |
[INFO] [stdout] 574 | / impl<T, U> Cacher<T, U>
[INFO] [stdout] 575 | |     where T: Fn(U) -> U, 
[INFO] [stdout] 576 | |           U: Hash + Eq + Copy,
[INFO] [stdout]     | |______________________________- associated items in this implementation
[INFO] [stdout] 577 |   {
[INFO] [stdout] 578 |       fn new(calculation: T) -> Self {
[INFO] [stdout]     |          ^^^
[INFO] [stdout] ...
[INFO] [stdout] 582 |       fn get_value(&mut self, arg: U) -> U {
[INFO] [stdout]     |          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generate_workout` is never used
[INFO] [stdout]    --> src/main.rs:595:4
[INFO] [stdout]     |
[INFO] [stdout] 595 | fn generate_workout(intensity: u32, random_number: u32) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `closure` is never used
[INFO] [stdout]    --> src/main.rs:620:4
[INFO] [stdout]     |
[INFO] [stdout] 620 | fn closure() {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let x = 5;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `three`
[INFO] [stdout]    --> src/main.rs:202:9
[INFO] [stdout]     |
[INFO] [stdout] 202 |     let three = User {
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_three`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/main.rs:251:9
[INFO] [stdout]     |
[INFO] [stdout] 251 |     let y = back(x);
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:277:27
[INFO] [stdout]     |
[INFO] [stdout] 277 |             Message::Move{x, y} => "move",
[INFO] [stdout]     |                           ^ help: try ignoring the field: `x: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/main.rs:277:30
[INFO] [stdout]     |
[INFO] [stdout] 277 |             Message::Move{x, y} => "move",
[INFO] [stdout]     |                              ^ help: try ignoring the field: `y: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:295:9
[INFO] [stdout]     |
[INFO] [stdout] 295 |     let x = if let Some(i) = some_num {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `first`
[INFO] [stdout]    --> src/main.rs:308:9
[INFO] [stdout]     |
[INFO] [stdout] 308 |     let first = &v[0];
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ans`
[INFO] [stdout]    --> src/main.rs:348:9
[INFO] [stdout]     |
[INFO] [stdout] 348 |     let ans = &hello[0..2]; // 慎用，用可能 panic
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_ans`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/main.rs:369:9
[INFO] [stdout]     |
[INFO] [stdout] 369 |     let value = scores.get("Blue");
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `score`
[INFO] [stdout]    --> src/main.rs:376:13
[INFO] [stdout]     |
[INFO] [stdout] 376 |     let mut score: HashMap<_, _> = teams.into_iter().zip(initial_scores.into_iter()).collect();
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:376:9
[INFO] [stdout]     |
[INFO] [stdout] 376 |     let mut score: HashMap<_, _> = teams.into_iter().zip(initial_scores.into_iter()).collect();
[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: unused variable: `t`
[INFO] [stdout]    --> src/main.rs:499:20
[INFO] [stdout]     |
[INFO] [stdout] 499 | fn some_func<T, U>(t: &T, u: &U) -> i32 
[INFO] [stdout]     |                    ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]    --> src/main.rs:499:27
[INFO] [stdout]     |
[INFO] [stdout] 499 | fn some_func<T, U>(t: &T, u: &U) -> i32 
[INFO] [stdout]     |                           ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `excerpt`
[INFO] [stdout]    --> src/main.rs:526:9
[INFO] [stdout]     |
[INFO] [stdout] 526 |     let excerpt = Excerpt {
[INFO] [stdout]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_excerpt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `typeofdata` is never used
[INFO] [stdout]   --> src/main.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn typeofdata() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `arra_y` is never used
[INFO] [stdout]   --> src/main.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn arra_y() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `label` is never used
[INFO] [stdout]   --> src/main.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn label() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `use_while` is never used
[INFO] [stdout]   --> src/main.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn use_while() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `ChangeColor` are never constructed
[INFO] [stdout]    --> src/main.rs:266:5
[INFO] [stdout]     |
[INFO] [stdout] 265 | enum Message {
[INFO] [stdout]     |      ------- variants in this enum
[INFO] [stdout] 266 |     Quit,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 267 |     Move { x: i32, y: i32 },
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 268 |     Write(String),
[INFO] [stdout] 269 |     ChangeColor(i32, i32, i32),
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `module` is never used
[INFO] [stdout]    --> src/main.rs:302:4
[INFO] [stdout]     |
[INFO] [stdout] 302 | fn module() {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_handle_with_wrap_helper` is never used
[INFO] [stdout]    --> src/main.rs:419:4
[INFO] [stdout]     |
[INFO] [stdout] 419 | fn error_handle_with_wrap_helper(file: &str) -> Result<String, io::Error> { // 枚举是一个范型, 范型用<>
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_handle_with_wrap` is never used
[INFO] [stdout]    --> src/main.rs:453:4
[INFO] [stdout]     |
[INFO] [stdout] 453 | fn error_handle_with_wrap() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_func` is never used
[INFO] [stdout]    --> src/main.rs:499:4
[INFO] [stdout]     |
[INFO] [stdout] 499 | fn some_func<T, U>(t: &T, u: &U) -> i32 
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `part` is never read
[INFO] [stdout]    --> src/main.rs:520:5
[INFO] [stdout]     |
[INFO] [stdout] 519 | struct Excerpt<'a> {
[INFO] [stdout]     |        ------- field in this struct
[INFO] [stdout] 520 |     part: &'a str,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]    --> src/main.rs:531:4
[INFO] [stdout]     |
[INFO] [stdout] 531 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cacher` is never constructed
[INFO] [stdout]    --> src/main.rs:565:8
[INFO] [stdout]     |
[INFO] [stdout] 565 | struct Cacher<T, U> 
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `get_value` are never used
[INFO] [stdout]    --> src/main.rs:578:8
[INFO] [stdout]     |
[INFO] [stdout] 574 | / impl<T, U> Cacher<T, U>
[INFO] [stdout] 575 | |     where T: Fn(U) -> U, 
[INFO] [stdout] 576 | |           U: Hash + Eq + Copy,
[INFO] [stdout]     | |______________________________- associated items in this implementation
[INFO] [stdout] 577 |   {
[INFO] [stdout] 578 |       fn new(calculation: T) -> Self {
[INFO] [stdout]     |          ^^^
[INFO] [stdout] ...
[INFO] [stdout] 582 |       fn get_value(&mut self, arg: U) -> U {
[INFO] [stdout]     |          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generate_workout` is never used
[INFO] [stdout]    --> src/main.rs:595:4
[INFO] [stdout]     |
[INFO] [stdout] 595 | fn generate_workout(intensity: u32, random_number: u32) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `closure` is never used
[INFO] [stdout]    --> src/main.rs:620:4
[INFO] [stdout]     |
[INFO] [stdout] 620 | fn closure() {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.49s
[INFO] running `Command { std: "docker" "inspect" "8af9a86489a8a54011cb47dc65c33fe114b81cc8f516df83c39f84c6379ea700", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8af9a86489a8a54011cb47dc65c33fe114b81cc8f516df83c39f84c6379ea700", kill_on_drop: false }`
[INFO] [stdout] 8af9a86489a8a54011cb47dc65c33fe114b81cc8f516df83c39f84c6379ea700