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[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/NeuropathyCC/rust_study" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNeuropathyCC%2Frust_study", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNeuropathyCC%2Frust_study'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
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[INFO] checking NeuropathyCC/rust_study/84e8399d17de81984db21f88198870b183d5feb0 against try#ccf408f4326a858c00dd845a64a86b16f360a801 for pr-129466-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNeuropathyCC%2Frust_study" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
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[INFO] validating manifest of git repo https://github.com/NeuropathyCC/rust_study on toolchain ccf408f4326a858c00dd845a64a86b16f360a801
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[INFO] finished tweaking git repo https://github.com/NeuropathyCC/rust_study
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+ccf408f4326a858c00dd845a64a86b16f360a801" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
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[INFO] [stderr] Copying to /tmp/fixit
[INFO] [stderr] Running `cargo fix --edition`
[INFO] [stderr]    Migrating Cargo.toml from 2021 edition to 2024
[INFO] [stderr]    Compiling unicode-ident v1.0.13
[INFO] [stderr]    Compiling libc v0.2.159
[INFO] [stderr]     Checking byteorder v1.5.0
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[INFO] [stderr]    Migrating src/main.rs from 2021 edition to 2024
[INFO] [stderr]        Fixed src/collection_demo/string.rs (1 fix)
[INFO] [stderr]        Fixed src/ownership/ownership.rs (1 fix)
[INFO] [stderr]        Fixed src/lifetime/smartptr_ownership.rs (1 fix)
[INFO] [stdout] warning: unused variable: `arr`
[INFO] [stdout]  --> src/collection_demo/vector.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let arr = [1, 2, 3];
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_arr`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/lifetime/lifetime.rs:16:25
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn eg_2<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stdout]    |                         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ref2`
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let ref2 = vec_ref.borrow_mut();
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_ref2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:56:24
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn some_function<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/trait_demo/trait_two.rs:56:30
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn some_function<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: `spaces`
[INFO] [stdout]   --> src/variable/scala_type.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let spaces = spaces.len();
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_spaces`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]   --> src/main.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct Guess {
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] 18 |     value: i32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/collection_demo/vector.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `SpreadsheetCell` is never used
[INFO] [stdout]   --> src/collection_demo/vector.rs:41:6
[INFO] [stdout]    |
[INFO] [stdout] 41 | enum SpreadsheetCell {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `move_str` is never used
[INFO] [stdout]  --> src/concurrency/sendsync.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn move_str() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error` is never used
[INFO] [stdout]  --> src/error/error.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn error() {
[INFO] [stdout]   |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `counter` is never used
[INFO] [stdout]   --> src/function/closure.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn counter(x: i32) -> impl Fn(i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `closure` is never used
[INFO] [stdout]    --> src/function/closure.rs:114:8
[INFO] [stdout]     |
[INFO] [stdout] 114 | pub fn closure() {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Any` is never used
[INFO] [stdout]    --> src/function/closure.rs:134:7
[INFO] [stdout]     |
[INFO] [stdout] 134 | trait Any {
[INFO] [stdout]     |       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `escape_closure` is never used
[INFO] [stdout]    --> src/function/closure.rs:175:8
[INFO] [stdout]     |
[INFO] [stdout] 175 | pub fn escape_closure() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `return_closure` is never used
[INFO] [stdout]    --> src/function/closure.rs:183:8
[INFO] [stdout]     |
[INFO] [stdout] 183 | pub fn return_closure() -> impl Fn(i32) -> i32 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `return_fn_once` is never used
[INFO] [stdout]    --> src/function/closure.rs:187:8
[INFO] [stdout]     |
[INFO] [stdout] 187 | pub fn return_fn_once() -> impl FnOnce(i32) -> i32 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fib` is never used
[INFO] [stdout]  --> src/function/constfn.rs:1:10
[INFO] [stdout]   |
[INFO] [stdout] 1 | const fn fib(n: u128) -> u128 {
[INFO] [stdout]   |          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `GA` is never used
[INFO] [stdout]   --> src/function/constfn.rs:11:11
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub const GA: u128 = fib(101);
[INFO] [stdout]    |           ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `snake_case` is never used
[INFO] [stdout]  --> src/function/functions.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn snake_case() {}
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fn` is never used
[INFO] [stdout]  --> src/function/functions.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn r#fn() {}
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `f` is never used
[INFO] [stdout]  --> src/function/functions.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn f() {
[INFO] [stdout]   |    ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/function/functions.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `S` is never constructed
[INFO] [stdout]   --> src/function/functions.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct S {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fm` is never used
[INFO] [stdout]   --> src/function/functions.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn fm(ref _s: S) {
[INFO] [stdout]    |    ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]   --> src/function/functions.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn foo(_: i32) { // 忽略参数
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `addsub` is never used
[INFO] [stdout]   --> src/function/functions.rs:46:4
[INFO] [stdout]    |
[INFO] [stdout] 46 | fn addsub(x: usize, y: usize) -> (usize, usize) {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `square` is never used
[INFO] [stdout]   --> src/function/functions.rs:52:4
[INFO] [stdout]    |
[INFO] [stdout] 52 | fn square<T: Mul<Output = T>>(x: T, y: T) -> T {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]   --> src/function/functions.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 60 | struct User {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `show` is never used
[INFO] [stdout]   --> src/function/functions.rs:66:8
[INFO] [stdout]    |
[INFO] [stdout] 65 | impl User {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 66 |     fn show(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `show_user` is never used
[INFO] [stdout]   --> src/function/functions.rs:72:4
[INFO] [stdout]    |
[INFO] [stdout] 72 | fn show_user() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `MathOp` is never used
[INFO] [stdout]  --> src/function/higherorderfunction.rs:2:6
[INFO] [stdout]   |
[INFO] [stdout] 2 | type MathOp = fn(i32, i32) -> i32;
[INFO] [stdout]   |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `math` is never used
[INFO] [stdout]  --> src/function/higherorderfunction.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn math(op: MathOp, a: i32, b: i32) -> i32 {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hello` is never used
[INFO] [stdout]  --> src/function/higherorderfunction.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn hello() {}
[INFO] [stdout]   |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `one_arg` is never used
[INFO] [stdout]   --> src/function/higherorderfunction.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn one_arg(x: i32) {}
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/function/higherorderfunction.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `do_sth` is never used
[INFO] [stdout]  --> src/function/higherrankedlifetime.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub trait DoSth<T> {
[INFO] [stdout]   |           ----- method in this trait
[INFO] [stdout] 6 |     fn do_sth(&self, value: T);
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]   --> src/function/higherrankedlifetime.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub fn foo(d: Box<dyn for<'a> DoSth<&'a u32>>) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Pick` is never constructed
[INFO] [stdout]   --> src/function/higherrankedlifetime.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Pick<F> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `call` is never used
[INFO] [stdout]   --> src/function/higherrankedlifetime.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | / impl<F> Pick<F>
[INFO] [stdout] 26 | | where
[INFO] [stdout] 27 | |     F: Fn(&(i32, i32)) -> &i32,
[INFO] [stdout]    | |_______________________________- method in this implementation
[INFO] [stdout] 28 |   {
[INFO] [stdout] 29 |       fn call<'a>(&'a self) -> &'a i32 {
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `max` is never used
[INFO] [stdout]   --> src/function/higherrankedlifetime.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn max(data: &(i32, i32)) -> &i32 {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `pick_test` is never used
[INFO] [stdout]   --> src/function/higherrankedlifetime.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn pick_test() {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `InIterator` is never used
[INFO] [stdout]  --> src/function/iterator.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | trait InIterator<T: Copy> {
[INFO] [stdout]   |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `inner_iterator` is never used
[INFO] [stdout]   --> src/function/iterator.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub fn inner_iterator() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `out_iterator` is never used
[INFO] [stdout]   --> src/function/iterator.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn out_iterator() {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Counter` is never constructed
[INFO] [stdout]   --> src/function/iterator.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 | struct Counter {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `ExtIteator` is never used
[INFO] [stdout]    --> src/function/iterator.rs:116:11
[INFO] [stdout]     |
[INFO] [stdout] 116 | pub trait ExtIteator: Iterator {
[INFO] [stdout]     |           ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `guss` is never used
[INFO] [stdout]  --> src/guess_number/guess.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn guss() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eg_2` is never used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn eg_2<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_str` is never used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn longest_str<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn longest<'a, 'b: 'a>(a: &'a str, b: &'b str) -> &'a str {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Foo` is never used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:51:7
[INFO] [stdout]    |
[INFO] [stdout] 51 | trait Foo<'a> {}
[INFO] [stdout]    |       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `FooImpl` is never constructed
[INFO] [stdout]   --> src/lifetime/lifetime.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | struct FooImpl<'a> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fool` is never used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn fool<'a>(s: &'a str) -> Box<dyn Foo<'a> + 'a> {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `empty` is never used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 | pub fn empty() {}
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eg_1` is never used
[INFO] [stdout]  --> src/lifetime/smartptr_ownership.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn eg_1() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eg_2` is never used
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn eg_2() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eg_rc` is never used
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn eg_rc() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Foo` is never constructed
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | struct Foo {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:48:4
[INFO] [stdout]    |
[INFO] [stdout] 48 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `refcell` is never used
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:69:4
[INFO] [stdout]    |
[INFO] [stdout] 69 | fn refcell() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `abs_all` is never used
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn abs_all(v: &mut Cow<[i32]>) {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `cowref` is never used
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:89:4
[INFO] [stdout]    |
[INFO] [stdout] 89 | fn cowref() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Book` is never constructed
[INFO] [stdout]   --> src/oop/mod.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct Book<'a> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `red`, `blue`, `yellow`, `on_red`, `on_blue`, and `on_yellow` are never used
[INFO] [stdout]   --> src/oop/color.rs:59:8
[INFO] [stdout]    |
[INFO] [stdout] 58 | pub trait Colorized {
[INFO] [stdout]    |           --------- methods in this trait
[INFO] [stdout] 59 |     fn red(self) -> ColorString;
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 60 |     fn blue(self) -> ColorString;
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 61 |     fn yellow(self) -> ColorString;
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 62 |     fn color<S: Into<Color>>(self, color: S) -> ColorString;
[INFO] [stdout] 63 |     fn on_red(self) -> ColorString;
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 64 |     fn on_blue(self) -> ColorString;
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 65 |     fn on_yellow(self) -> ColorString;
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn ownership() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string_copy` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:65:4
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn string_copy() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `stack_only_data_copy` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:79:4
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn stack_only_data_copy() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_ownership` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:85:4
[INFO] [stdout]    |
[INFO] [stdout] 85 | fn takes_ownership(some_string: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `makes_copy` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:91:4
[INFO] [stdout]    |
[INFO] [stdout] 91 | fn makes_copy(some_integer: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_length` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:96:4
[INFO] [stdout]    |
[INFO] [stdout] 96 | fn calculate_length(s: String) -> (String, usize) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `no_dangle` is never used
[INFO] [stdout]    --> src/ownership/ownership.rs:109:8
[INFO] [stdout]     |
[INFO] [stdout] 109 | pub fn no_dangle() -> String {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/struct_and_enum/enum_demo.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IPAddrKind` is never used
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | enum IPAddrKind {
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IPAddr` is never constructed
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct IPAddr {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:26:6
[INFO] [stdout]    |
[INFO] [stdout] 26 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `call` is never used
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | impl Message {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] 34 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `QuitMesseage` is never constructed
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | struct QuitMesseage;
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MoveMesseage` is never constructed
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 40 | struct MoveMesseage {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `WriteMesseage` is never constructed
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | struct WriteMesseage(String);
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ChangeColorMesseage` is never constructed
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 45 | struct ChangeColorMesseage(i32, i32, i32);
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]  --> src/struct_and_enum/struct_demo.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/struct_and_enum/struct_demo.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_user` is never used
[INFO] [stdout]   --> src/struct_and_enum/struct_demo.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn build_user(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]  --> src/struct_and_enum/struct_example.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Rectangle {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `area`, `can_hold`, and `square` are never used
[INFO] [stdout]   --> src/struct_and_enum/struct_example.rs:8:8
[INFO] [stdout]    |
[INFO] [stdout] 7  | impl Rectangle {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 8  |     fn area(&self) -> u32 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 12 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     fn square(size: u32) -> Rectangle {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/struct_and_enum/struct_example.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area` is never used
[INFO] [stdout]   --> src/struct_and_enum/struct_example.rs:60:4
[INFO] [stdout]    |
[INFO] [stdout] 60 | fn area(rectangle: &Rectangle) -> u32 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/trait_demo/conditionallyimpltrait.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main() {}
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Pair` is never constructed
[INFO] [stdout]  --> src/trait_demo/conditionallyimpltrait.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Pair<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/trait_demo/conditionallyimpltrait.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 9  | impl<T> Pair<T> {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 10 |     fn new(x: T, y: T) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `cmp_display` is never used
[INFO] [stdout]   --> src/trait_demo/conditionallyimpltrait.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl<T: Display + PartialOrd> Pair<T> {
[INFO] [stdout]    | ------------------------------------- method in this implementation
[INFO] [stdout] 16 |     fn cmp_display(&self) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]  --> src/trait_demo/generic.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Point<T, U> {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `mixup` is never used
[INFO] [stdout]  --> src/trait_demo/generic.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl<T, U> Point<T, U> {
[INFO] [stdout]   | ---------------------- method in this implementation
[INFO] [stdout] 7 |     fn mixup<V, W>(self, other: Point<V, W>) -> Point<T, W> {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SinglePoint` is never constructed
[INFO] [stdout]   --> src/trait_demo/generic.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | struct SinglePoint<T> {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `x` is never used
[INFO] [stdout]   --> src/trait_demo/generic.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<T> SinglePoint<T> {
[INFO] [stdout]    | ---------------------- method in this implementation
[INFO] [stdout] 21 |     fn x(&self) -> &T {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `distance_from_origin` is never used
[INFO] [stdout]   --> src/trait_demo/generic.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl SinglePoint<f32> {
[INFO] [stdout]    | --------------------- method in this implementation
[INFO] [stdout] 27 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/trait_demo/generic.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/trait_demo/largestfunction.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest` is never used
[INFO] [stdout]   --> src/trait_demo/largestfunction.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn largest<T: Copy + PartialOrd>(list: &[T]) -> T {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/trait_demo/lifetime.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]   --> src/trait_demo/lifetime.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ImportantExcerpt` is never constructed
[INFO] [stdout]  --> src/trait_demo/structrefs.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct ImportantExcerpt<'a> {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/trait_demo/structrefs.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_with_an_announcement` is never used
[INFO] [stdout]   --> src/trait_demo/structrefs.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `summarize` is never used
[INFO] [stdout]  --> src/trait_demo/trait_demo.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait Summary {
[INFO] [stdout]   |           ------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 5 |     fn summarize(&self) -> String {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NewsArticle` is never constructed
[INFO] [stdout]   --> src/trait_demo/trait_demo.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct NewsArticle {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]   --> src/trait_demo/trait_demo.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct Tweet {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 20 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 21 |     pub retweet: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/trait_demo/trait_demo.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `summarize_author` and `summarize` are never used
[INFO] [stdout]  --> src/trait_demo/trait_two.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub trait Summary {
[INFO] [stdout]   |           ------- methods in this trait
[INFO] [stdout] 5 |     fn summarize_author(&self) -> String;
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 6 |
[INFO] [stdout] 7 |     fn summarize(&self) -> String {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `content`, `reply`, and `retweet` are never read
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub struct Tweet {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] 13 |     pub username: String,
[INFO] [stdout] 14 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 15 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 16 |     pub retweet: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify` is never used
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 40 | pub fn notify(item: impl Summary) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_actually` is never used
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | pub fn notify_actually<T: Summary>(item: T) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_function` is never used
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:56:4
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `returns_summarized` is never used
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:65:4
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn returns_summarized() -> impl Summary {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `compound_type` is never used
[INFO] [stdout]  --> src/variable/compound_type.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn compound_type() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `flow` is never used
[INFO] [stdout]  --> src/variable/control_flow.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn flow() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `range_with_rev` is never used
[INFO] [stdout]  --> src/variable/control_flow.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn range_with_rev() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `if_condition` is never used
[INFO] [stdout]   --> src/variable/control_flow.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn if_condition() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `condition` is never used
[INFO] [stdout]   --> src/variable/control_flow.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn condition() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loop_demo` is never used
[INFO] [stdout]   --> src/variable/control_flow.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn loop_demo() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loop_with_result` is never used
[INFO] [stdout]   --> src/variable/control_flow.rs:45:4
[INFO] [stdout]    |
[INFO] [stdout] 45 | fn loop_with_result() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `condition_loop_with_while` is never used
[INFO] [stdout]   --> src/variable/control_flow.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn condition_loop_with_while() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loop_with_for` is never used
[INFO] [stdout]   --> src/variable/control_flow.rs:70:4
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn loop_with_for() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `float` is never used
[INFO] [stdout]  --> src/variable/float.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn float() {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_result` is never used
[INFO] [stdout]  --> src/variable/match_pattern.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn match_result() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `UsState` is never used
[INFO] [stdout]   --> src/variable/match_pattern.rs:21:6
[INFO] [stdout]    |
[INFO] [stdout] 21 | enum UsState {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Coin` is never used
[INFO] [stdout]   --> src/variable/match_pattern.rs:28:6
[INFO] [stdout]    |
[INFO] [stdout] 28 | enum Coin {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `value_in_cents` is never used
[INFO] [stdout]   --> src/variable/match_pattern.rs:36:4
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn value_in_cents(coin: Coin) -> u8 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `scala_type` is never used
[INFO] [stdout]  --> src/variable/scala_type.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn scala_type() {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `String::as_str` that must be used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     result.as_str();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let _ = result.as_str();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 132 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]        Fixed src/function/mod.rs (1 fix)
[INFO] [stderr]        Fixed src/borrow/mod.rs (1 fix)
[INFO] [stdout] warning: creating a shared reference to mutable static is discouraged
[INFO] [stdout]   --> src/concurrency/mod.rs:24:65
[INFO] [stdout]    |
[INFO] [stdout] 24 |                     println!("{:?},{}", thread::current().id(), &V);
[INFO] [stdout]    |                                                                 ^^ shared reference to mutable static
[INFO] [stdout]    |
[INFO] [stdout]    = note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
[INFO] [stdout]    = note: this will be a hard error in the 2024 edition
[INFO] [stdout]    = note: this shared reference has lifetime `'static`, but if the static ever gets mutated, or a mutable reference is created, then any further use of this shared reference is Undefined Behavior
[INFO] [stdout]    = note: `--force-warn static-mut-refs` implied by `--force-warn rust-2024-compatibility`
[INFO] [stdout] help: use `addr_of!` instead to create a raw pointer
[INFO] [stdout]    |
[INFO] [stdout] 24 |                     println!("{:?},{}", thread::current().id(), addr_of!(V));
[INFO] [stdout]    |                                                                 ~~~~~~~~~ +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: creating a shared reference to mutable static is discouraged
[INFO] [stdout]   --> src/concurrency/mod.rs:38:65
[INFO] [stdout]    |
[INFO] [stdout] 38 |                     println!("{:?},{}", thread::current().id(), &V);
[INFO] [stdout]    |                                                                 ^^ shared reference to mutable static
[INFO] [stdout]    |
[INFO] [stdout]    = note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
[INFO] [stdout]    = note: this will be a hard error in the 2024 edition
[INFO] [stdout]    = note: this shared reference has lifetime `'static`, but if the static ever gets mutated, or a mutable reference is created, then any further use of this shared reference is Undefined Behavior
[INFO] [stdout] help: use `addr_of!` instead to create a raw pointer
[INFO] [stdout]    |
[INFO] [stdout] 38 |                     println!("{:?},{}", thread::current().id(), addr_of!(V));
[INFO] [stdout]    |                                                                 ~~~~~~~~~ +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: creating a shared reference to mutable static is discouraged
[INFO] [stdout]   --> src/concurrency/mod.rs:39:28
[INFO] [stdout]    |
[INFO] [stdout] 39 |                     return &V;
[INFO] [stdout]    |                            ^^ shared reference to mutable static
[INFO] [stdout]    |
[INFO] [stdout]    = note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
[INFO] [stdout]    = note: this will be a hard error in the 2024 edition
[INFO] [stdout]    = note: this shared reference has lifetime `'static`, but if the static ever gets mutated, or a mutable reference is created, then any further use of this shared reference is Undefined Behavior
[INFO] [stdout] help: use `addr_of!` instead to create a raw pointer
[INFO] [stdout]    |
[INFO] [stdout] 39 |                     return addr_of!(V);
[INFO] [stdout]    |                            ~~~~~~~~~ +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: creating a shared reference to mutable static is discouraged
[INFO] [stdout]   --> src/concurrency/mod.rs:45:69
[INFO] [stdout]    |
[INFO] [stdout] 45 |             println!("main thread {:?},{}", thread::current().id(), &V);
[INFO] [stdout]    |                                                                     ^^ shared reference to mutable static
[INFO] [stdout]    |
[INFO] [stdout]    = note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
[INFO] [stdout]    = note: this will be a hard error in the 2024 edition
[INFO] [stdout]    = note: this shared reference has lifetime `'static`, but if the static ever gets mutated, or a mutable reference is created, then any further use of this shared reference is Undefined Behavior
[INFO] [stdout] help: use `addr_of!` instead to create a raw pointer
[INFO] [stdout]    |
[INFO] [stdout] 45 |             println!("main thread {:?},{}", thread::current().id(), addr_of!(V));
[INFO] [stdout]    |                                                                     ~~~~~~~~~ +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/oop/mod.rs:59:18
[INFO] [stdout]    |
[INFO] [stdout] 59 |         let t2 = (PrintDrop("a"), PrintDrop("b"), panic!());
[INFO] [stdout]    |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^--------^
[INFO] [stdout]    |                  |                                |
[INFO] [stdout]    |                  |                                any code following this expression is unreachable
[INFO] [stdout]    |                  unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/borrow/mod.rs:90:13
[INFO] [stdout]    |
[INFO] [stdout] 90 |     fn p<X>(x: X) {
[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: `arr`
[INFO] [stdout]  --> src/collection_demo/vector.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let arr = [1, 2, 3];
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_arr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/lifetime/lifetime.rs:16:25
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn eg_2<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stdout]    |                         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ref2`
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let ref2 = vec_ref.borrow_mut();
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_ref2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/oop/mod.rs:51:13
[INFO] [stdout]    |
[INFO] [stdout] 51 |         let x = PrintDrop("x");
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/oop/mod.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |         let y = PrintDrop("y");
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t1`
[INFO] [stdout]   --> src/oop/mod.rs:58:13
[INFO] [stdout]    |
[INFO] [stdout] 58 |         let t1 = (PrintDrop("x"), PrintDrop("y"), PrintDrop("z"));
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_t1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t2`
[INFO] [stdout]   --> src/oop/mod.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |         let t2 = (PrintDrop("a"), PrintDrop("b"), panic!());
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_t2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:56:24
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn some_function<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/trait_demo/trait_two.rs:56:30
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn some_function<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: `spaces`
[INFO] [stdout]   --> src/variable/scala_type.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let spaces = spaces.len();
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_spaces`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]   --> src/borrow/mod.rs:62:8
[INFO] [stdout]    |
[INFO] [stdout] 62 |     fn longest<'a, 'b: 'a>(a: &'a str, b: &'b str) -> &'a str {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/collection_demo/vector.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `SpreadsheetCell` is never used
[INFO] [stdout]   --> src/collection_demo/vector.rs:41:6
[INFO] [stdout]    |
[INFO] [stdout] 41 | enum SpreadsheetCell {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `move_str` is never used
[INFO] [stdout]  --> src/concurrency/sendsync.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn move_str() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error` is never used
[INFO] [stdout]  --> src/error/error.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn error() {
[INFO] [stdout]   |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `counter` is never used
[INFO] [stdout]   --> src/function/closure.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn counter(x: i32) -> impl Fn(i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Any` is never used
[INFO] [stdout]    --> src/function/closure.rs:134:7
[INFO] [stdout]     |
[INFO] [stdout] 134 | trait Any {
[INFO] [stdout]     |       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `snake_case` is never used
[INFO] [stdout]  --> src/function/functions.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn snake_case() {}
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fn` is never used
[INFO] [stdout]  --> src/function/functions.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn r#fn() {}
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `f` is never used
[INFO] [stdout]  --> src/function/functions.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn f() {
[INFO] [stdout]   |    ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/function/functions.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `S` is never constructed
[INFO] [stdout]   --> src/function/functions.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct S {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fm` is never used
[INFO] [stdout]   --> src/function/functions.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn fm(ref _s: S) {
[INFO] [stdout]    |    ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]   --> src/function/functions.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn foo(_: i32) { // 忽略参数
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `addsub` is never used
[INFO] [stdout]   --> src/function/functions.rs:46:4
[INFO] [stdout]    |
[INFO] [stdout] 46 | fn addsub(x: usize, y: usize) -> (usize, usize) {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `square` is never used
[INFO] [stdout]   --> src/function/functions.rs:52:4
[INFO] [stdout]    |
[INFO] [stdout] 52 | fn square<T: Mul<Output = T>>(x: T, y: T) -> T {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]   --> src/function/functions.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 60 | struct User {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `show` is never used
[INFO] [stdout]   --> src/function/functions.rs:66:8
[INFO] [stdout]    |
[INFO] [stdout] 65 | impl User {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 66 |     fn show(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `show_user` is never used
[INFO] [stdout]   --> src/function/functions.rs:72:4
[INFO] [stdout]    |
[INFO] [stdout] 72 | fn show_user() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `MathOp` is never used
[INFO] [stdout]  --> src/function/higherorderfunction.rs:2:6
[INFO] [stdout]   |
[INFO] [stdout] 2 | type MathOp = fn(i32, i32) -> i32;
[INFO] [stdout]   |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `math` is never used
[INFO] [stdout]  --> src/function/higherorderfunction.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn math(op: MathOp, a: i32, b: i32) -> i32 {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hello` is never used
[INFO] [stdout]  --> src/function/higherorderfunction.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn hello() {}
[INFO] [stdout]   |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `one_arg` is never used
[INFO] [stdout]   --> src/function/higherorderfunction.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn one_arg(x: i32) {}
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/function/higherorderfunction.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `ExtIteator` is never used
[INFO] [stdout]    --> src/function/iterator.rs:116:11
[INFO] [stdout]     |
[INFO] [stdout] 116 | pub trait ExtIteator: Iterator {
[INFO] [stdout]     |           ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eg_2` is never used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn eg_2<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_str` is never used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn longest_str<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn longest<'a, 'b: 'a>(a: &'a str, b: &'b str) -> &'a str {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Foo` is never used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:51:7
[INFO] [stdout]    |
[INFO] [stdout] 51 | trait Foo<'a> {}
[INFO] [stdout]    |       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `FooImpl` is never constructed
[INFO] [stdout]   --> src/lifetime/lifetime.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | struct FooImpl<'a> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fool` is never used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn fool<'a>(s: &'a str) -> Box<dyn Foo<'a> + 'a> {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `empty` is never used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 | pub fn empty() {}
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eg_1` is never used
[INFO] [stdout]  --> src/lifetime/smartptr_ownership.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn eg_1() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eg_2` is never used
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn eg_2() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eg_rc` is never used
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn eg_rc() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Foo` is never constructed
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | struct Foo {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:48:4
[INFO] [stdout]    |
[INFO] [stdout] 48 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `refcell` is never used
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:69:4
[INFO] [stdout]    |
[INFO] [stdout] 69 | fn refcell() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `abs_all` is never used
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn abs_all(v: &mut Cow<[i32]>) {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `cowref` is never used
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:89:4
[INFO] [stdout]    |
[INFO] [stdout] 89 | fn cowref() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name`, `isbn`, and `version` are never read
[INFO] [stdout]   --> src/oop/mod.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct Book<'a> {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 17 |     name: &'a str,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 18 |     isbn: i32,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 19 |     version: i32,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Book` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `red`, `blue`, `on_red`, and `on_yellow` are never used
[INFO] [stdout]   --> src/oop/color.rs:59:8
[INFO] [stdout]    |
[INFO] [stdout] 58 | pub trait Colorized {
[INFO] [stdout]    |           --------- methods in this trait
[INFO] [stdout] 59 |     fn red(self) -> ColorString;
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 60 |     fn blue(self) -> ColorString;
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 63 |     fn on_red(self) -> ColorString;
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 64 |     fn on_blue(self) -> ColorString;
[INFO] [stdout] 65 |     fn on_yellow(self) -> ColorString;
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn ownership() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string_copy` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:65:4
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn string_copy() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `stack_only_data_copy` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:79:4
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn stack_only_data_copy() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_ownership` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:85:4
[INFO] [stdout]    |
[INFO] [stdout] 85 | fn takes_ownership(some_string: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `makes_copy` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:91:4
[INFO] [stdout]    |
[INFO] [stdout] 91 | fn makes_copy(some_integer: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_length` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:96:4
[INFO] [stdout]    |
[INFO] [stdout] 96 | fn calculate_length(s: String) -> (String, usize) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/struct_and_enum/enum_demo.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IPAddrKind` is never used
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | enum IPAddrKind {
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IPAddr` is never constructed
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct IPAddr {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:26:6
[INFO] [stdout]    |
[INFO] [stdout] 26 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `call` is never used
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | impl Message {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] 34 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `QuitMesseage` is never constructed
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | struct QuitMesseage;
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MoveMesseage` is never constructed
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 40 | struct MoveMesseage {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `WriteMesseage` is never constructed
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | struct WriteMesseage(String);
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ChangeColorMesseage` is never constructed
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 45 | struct ChangeColorMesseage(i32, i32, i32);
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]  --> src/struct_and_enum/struct_demo.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/struct_and_enum/struct_demo.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_user` is never used
[INFO] [stdout]   --> src/struct_and_enum/struct_demo.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn build_user(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]  --> src/struct_and_enum/struct_example.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Rectangle {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `area`, `can_hold`, and `square` are never used
[INFO] [stdout]   --> src/struct_and_enum/struct_example.rs:8:8
[INFO] [stdout]    |
[INFO] [stdout] 7  | impl Rectangle {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 8  |     fn area(&self) -> u32 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 12 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     fn square(size: u32) -> Rectangle {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/struct_and_enum/struct_example.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area` is never used
[INFO] [stdout]   --> src/struct_and_enum/struct_example.rs:60:4
[INFO] [stdout]    |
[INFO] [stdout] 60 | fn area(rectangle: &Rectangle) -> u32 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/trait_demo/conditionallyimpltrait.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main() {}
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Pair` is never constructed
[INFO] [stdout]  --> src/trait_demo/conditionallyimpltrait.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Pair<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/trait_demo/conditionallyimpltrait.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 9  | impl<T> Pair<T> {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 10 |     fn new(x: T, y: T) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `cmp_display` is never used
[INFO] [stdout]   --> src/trait_demo/conditionallyimpltrait.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl<T: Display + PartialOrd> Pair<T> {
[INFO] [stdout]    | ------------------------------------- method in this implementation
[INFO] [stdout] 16 |     fn cmp_display(&self) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.79s
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]  --> src/trait_demo/generic.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Point<T, U> {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `mixup` is never used
[INFO] [stdout]  --> src/trait_demo/generic.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl<T, U> Point<T, U> {
[INFO] [stdout]   | ---------------------- method in this implementation
[INFO] [stdout] 7 |     fn mixup<V, W>(self, other: Point<V, W>) -> Point<T, W> {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SinglePoint` is never constructed
[INFO] [stdout]   --> src/trait_demo/generic.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | struct SinglePoint<T> {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `x` is never used
[INFO] [stdout]   --> src/trait_demo/generic.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<T> SinglePoint<T> {
[INFO] [stdout]    | ---------------------- method in this implementation
[INFO] [stdout] 21 |     fn x(&self) -> &T {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `distance_from_origin` is never used
[INFO] [stdout]   --> src/trait_demo/generic.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl SinglePoint<f32> {
[INFO] [stdout]    | --------------------- method in this implementation
[INFO] [stdout] 27 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/trait_demo/generic.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/trait_demo/largestfunction.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest` is never used
[INFO] [stdout]   --> src/trait_demo/largestfunction.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn largest<T: Copy + PartialOrd>(list: &[T]) -> T {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/trait_demo/lifetime.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]   --> src/trait_demo/lifetime.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ImportantExcerpt` is never constructed
[INFO] [stdout]  --> src/trait_demo/structrefs.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct ImportantExcerpt<'a> {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/trait_demo/structrefs.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_with_an_announcement` is never used
[INFO] [stdout]   --> src/trait_demo/structrefs.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `summarize` is never used
[INFO] [stdout]  --> src/trait_demo/trait_demo.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait Summary {
[INFO] [stdout]   |           ------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 5 |     fn summarize(&self) -> String {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NewsArticle` is never constructed
[INFO] [stdout]   --> src/trait_demo/trait_demo.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct NewsArticle {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]   --> src/trait_demo/trait_demo.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct Tweet {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 20 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 21 |     pub retweet: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/trait_demo/trait_demo.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `summarize_author` and `summarize` are never used
[INFO] [stdout]  --> src/trait_demo/trait_two.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub trait Summary {
[INFO] [stdout]   |           ------- methods in this trait
[INFO] [stdout] 5 |     fn summarize_author(&self) -> String;
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 6 |
[INFO] [stdout] 7 |     fn summarize(&self) -> String {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `content`, `reply`, and `retweet` are never read
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub struct Tweet {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] 13 |     pub username: String,
[INFO] [stdout] 14 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 15 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 16 |     pub retweet: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify` is never used
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 40 | pub fn notify(item: impl Summary) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_actually` is never used
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | pub fn notify_actually<T: Summary>(item: T) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_function` is never used
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:56:4
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `returns_summarized` is never used
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:65:4
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn returns_summarized() -> impl Summary {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `compound_type` is never used
[INFO] [stdout]  --> src/variable/compound_type.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn compound_type() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `flow` is never used
[INFO] [stdout]  --> src/variable/control_flow.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn flow() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `range_with_rev` is never used
[INFO] [stdout]  --> src/variable/control_flow.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn range_with_rev() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `if_condition` is never used
[INFO] [stdout]   --> src/variable/control_flow.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn if_condition() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `condition` is never used
[INFO] [stdout]   --> src/variable/control_flow.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn condition() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loop_demo` is never used
[INFO] [stdout]   --> src/variable/control_flow.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn loop_demo() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loop_with_result` is never used
[INFO] [stdout]   --> src/variable/control_flow.rs:45:4
[INFO] [stdout]    |
[INFO] [stdout] 45 | fn loop_with_result() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `condition_loop_with_while` is never used
[INFO] [stdout]   --> src/variable/control_flow.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn condition_loop_with_while() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loop_with_for` is never used
[INFO] [stdout]   --> src/variable/control_flow.rs:70:4
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn loop_with_for() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `float` is never used
[INFO] [stdout]  --> src/variable/float.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn float() {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_result` is never used
[INFO] [stdout]  --> src/variable/match_pattern.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn match_result() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `UsState` is never used
[INFO] [stdout]   --> src/variable/match_pattern.rs:21:6
[INFO] [stdout]    |
[INFO] [stdout] 21 | enum UsState {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Coin` is never used
[INFO] [stdout]   --> src/variable/match_pattern.rs:28:6
[INFO] [stdout]    |
[INFO] [stdout] 28 | enum Coin {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `value_in_cents` is never used
[INFO] [stdout]   --> src/variable/match_pattern.rs:36:4
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn value_in_cents(coin: Coin) -> u8 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `scala_type` is never used
[INFO] [stdout]  --> src/variable/scala_type.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn scala_type() {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `String::as_str` that must be used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     result.as_str();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let _ = result.as_str();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 124 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] Running `cargo check` to verify 2024
[INFO] [stderr]     Checking rust_tutorial v0.1.0 (/tmp/fixit)
[INFO] [stdout] error[E0796]: creating a shared reference to a mutable static
[INFO] [stdout]   --> src/concurrency/mod.rs:24:65
[INFO] [stdout]    |
[INFO] [stdout] 24 |                     println!("{:?},{}", thread::current().id(), &V);
[INFO] [stdout]    |                                                                 ^^ shared reference to mutable static
[INFO] [stdout]    |
[INFO] [stdout]    = note: this shared reference has lifetime `'static`, but if the static ever gets mutated, or a mutable reference is created, then any further use of this shared reference is Undefined Behavior
[INFO] [stdout] help: use `addr_of!` instead to create a raw pointer
[INFO] [stdout]    |
[INFO] [stdout] 24 |                     println!("{:?},{}", thread::current().id(), addr_of!(V));
[INFO] [stdout]    |                                                                 ~~~~~~~~~ +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0796]: creating a shared reference to a mutable static
[INFO] [stdout]   --> src/concurrency/mod.rs:38:65
[INFO] [stdout]    |
[INFO] [stdout] 38 |                     println!("{:?},{}", thread::current().id(), &V);
[INFO] [stdout]    |                                                                 ^^ shared reference to mutable static
[INFO] [stdout]    |
[INFO] [stdout]    = note: this shared reference has lifetime `'static`, but if the static ever gets mutated, or a mutable reference is created, then any further use of this shared reference is Undefined Behavior
[INFO] [stdout] help: use `addr_of!` instead to create a raw pointer
[INFO] [stdout]    |
[INFO] [stdout] 38 |                     println!("{:?},{}", thread::current().id(), addr_of!(V));
[INFO] [stdout]    |                                                                 ~~~~~~~~~ +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0796]: creating a shared reference to a mutable static
[INFO] [stdout]   --> src/concurrency/mod.rs:39:28
[INFO] [stdout]    |
[INFO] [stdout] 39 |                     return &V;
[INFO] [stdout]    |                            ^^ shared reference to mutable static
[INFO] [stdout]    |
[INFO] [stdout]    = note: this shared reference has lifetime `'static`, but if the static ever gets mutated, or a mutable reference is created, then any further use of this shared reference is Undefined Behavior
[INFO] [stdout] help: use `addr_of!` instead to create a raw pointer
[INFO] [stdout]    |
[INFO] [stdout] 39 |                     return addr_of!(V);
[INFO] [stdout]    |                            ~~~~~~~~~ +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0796]: creating a shared reference to a mutable static
[INFO] [stdout]   --> src/concurrency/mod.rs:45:69
[INFO] [stdout]    |
[INFO] [stdout] 45 |             println!("main thread {:?},{}", thread::current().id(), &V);
[INFO] [stdout]    |                                                                     ^^ shared reference to mutable static
[INFO] [stdout]    |
[INFO] [stdout]    = note: this shared reference has lifetime `'static`, but if the static ever gets mutated, or a mutable reference is created, then any further use of this shared reference is Undefined Behavior
[INFO] [stdout] help: use `addr_of!` instead to create a raw pointer
[INFO] [stdout]    |
[INFO] [stdout] 45 |             println!("main thread {:?},{}", thread::current().id(), addr_of!(V));
[INFO] [stdout]    |                                                                     ~~~~~~~~~ +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arr`
[INFO] [stdout]  --> src/collection_demo/vector.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let arr = [1, 2, 3];
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_arr`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/oop/mod.rs:59:18
[INFO] [stdout]    |
[INFO] [stdout] 59 |         let t2 = (PrintDrop("a"), PrintDrop("b"), panic!());
[INFO] [stdout]    |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^--------^
[INFO] [stdout]    |                  |                                |
[INFO] [stdout]    |                  |                                any code following this expression is unreachable
[INFO] [stdout]    |                  unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/lifetime/lifetime.rs:16:25
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn eg_2<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stdout]    |                         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ref2`
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let ref2 = vec_ref.borrow_mut();
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_ref2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/borrow/mod.rs:90:13
[INFO] [stdout]    |
[INFO] [stdout] 90 |     fn p<X>(x: X) {
[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: `arr`
[INFO] [stdout]  --> src/collection_demo/vector.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let arr = [1, 2, 3];
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_arr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:56:24
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn some_function<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/trait_demo/trait_two.rs:56:30
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn some_function<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: `spaces`
[INFO] [stdout]   --> src/variable/scala_type.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let spaces = spaces.len();
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_spaces`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]   --> src/main.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct Guess {
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] 18 |     value: i32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/collection_demo/vector.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `SpreadsheetCell` is never used
[INFO] [stdout]   --> src/collection_demo/vector.rs:41:6
[INFO] [stdout]    |
[INFO] [stdout] 41 | enum SpreadsheetCell {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `move_str` is never used
[INFO] [stdout]  --> src/concurrency/sendsync.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn move_str() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error` is never used
[INFO] [stdout]  --> src/error/error.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn error() {
[INFO] [stdout]   |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `counter` is never used
[INFO] [stdout]   --> src/function/closure.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn counter(x: i32) -> impl Fn(i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `closure` is never used
[INFO] [stdout]    --> src/function/closure.rs:114:8
[INFO] [stdout]     |
[INFO] [stdout] 114 | pub fn closure() {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Any` is never used
[INFO] [stdout]    --> src/function/closure.rs:134:7
[INFO] [stdout]     |
[INFO] [stdout] 134 | trait Any {
[INFO] [stdout]     |       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `escape_closure` is never used
[INFO] [stdout]    --> src/function/closure.rs:175:8
[INFO] [stdout]     |
[INFO] [stdout] 175 | pub fn escape_closure() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `return_closure` is never used
[INFO] [stdout]    --> src/function/closure.rs:183:8
[INFO] [stdout]     |
[INFO] [stdout] 183 | pub fn return_closure() -> impl Fn(i32) -> i32 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `return_fn_once` is never used
[INFO] [stdout]    --> src/function/closure.rs:187:8
[INFO] [stdout]     |
[INFO] [stdout] 187 | pub fn return_fn_once() -> impl FnOnce(i32) -> i32 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fib` is never used
[INFO] [stdout]  --> src/function/constfn.rs:1:10
[INFO] [stdout]   |
[INFO] [stdout] 1 | const fn fib(n: u128) -> u128 {
[INFO] [stdout]   |          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `GA` is never used
[INFO] [stdout]   --> src/function/constfn.rs:11:11
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub const GA: u128 = fib(101);
[INFO] [stdout]    |           ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `snake_case` is never used
[INFO] [stdout]  --> src/function/functions.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn snake_case() {}
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fn` is never used
[INFO] [stdout]  --> src/function/functions.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn r#fn() {}
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `f` is never used
[INFO] [stdout]  --> src/function/functions.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn f() {
[INFO] [stdout]   |    ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/function/functions.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `S` is never constructed
[INFO] [stdout]   --> src/function/functions.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct S {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fm` is never used
[INFO] [stdout]   --> src/function/functions.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn fm(ref _s: S) {
[INFO] [stdout]    |    ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]   --> src/function/functions.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn foo(_: i32) { // 忽略参数
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `addsub` is never used
[INFO] [stdout]   --> src/function/functions.rs:46:4
[INFO] [stdout]    |
[INFO] [stdout] 46 | fn addsub(x: usize, y: usize) -> (usize, usize) {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `square` is never used
[INFO] [stdout]   --> src/function/functions.rs:52:4
[INFO] [stdout]    |
[INFO] [stdout] 52 | fn square<T: Mul<Output = T>>(x: T, y: T) -> T {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]   --> src/function/functions.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 60 | struct User {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `show` is never used
[INFO] [stdout]   --> src/function/functions.rs:66:8
[INFO] [stdout]    |
[INFO] [stdout] 65 | impl User {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 66 |     fn show(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `show_user` is never used
[INFO] [stdout]   --> src/function/functions.rs:72:4
[INFO] [stdout]    |
[INFO] [stdout] 72 | fn show_user() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `MathOp` is never used
[INFO] [stdout]  --> src/function/higherorderfunction.rs:2:6
[INFO] [stdout]   |
[INFO] [stdout] 2 | type MathOp = fn(i32, i32) -> i32;
[INFO] [stdout]   |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `math` is never used
[INFO] [stdout]  --> src/function/higherorderfunction.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn math(op: MathOp, a: i32, b: i32) -> i32 {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hello` is never used
[INFO] [stdout]  --> src/function/higherorderfunction.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn hello() {}
[INFO] [stdout]   |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `one_arg` is never used
[INFO] [stdout]   --> src/function/higherorderfunction.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn one_arg(x: i32) {}
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/function/higherorderfunction.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `do_sth` is never used
[INFO] [stdout]  --> src/function/higherrankedlifetime.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub trait DoSth<T> {
[INFO] [stdout]   |           ----- method in this trait
[INFO] [stdout] 6 |     fn do_sth(&self, value: T);
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]   --> src/function/higherrankedlifetime.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub fn foo(d: Box<dyn for<'a> DoSth<&'a u32>>) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Pick` is never constructed
[INFO] [stdout]   --> src/function/higherrankedlifetime.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Pick<F> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `call` is never used
[INFO] [stdout]   --> src/function/higherrankedlifetime.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | / impl<F> Pick<F>
[INFO] [stdout] 26 | | where
[INFO] [stdout] 27 | |     F: Fn(&(i32, i32)) -> &i32,
[INFO] [stdout]    | |_______________________________- method in this implementation
[INFO] [stdout] 28 |   {
[INFO] [stdout] 29 |       fn call<'a>(&'a self) -> &'a i32 {
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `max` is never used
[INFO] [stdout]   --> src/function/higherrankedlifetime.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn max(data: &(i32, i32)) -> &i32 {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `pick_test` is never used
[INFO] [stdout]   --> src/function/higherrankedlifetime.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn pick_test() {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `InIterator` is never used
[INFO] [stdout]  --> src/function/iterator.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | trait InIterator<T: Copy> {
[INFO] [stdout]   |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `inner_iterator` is never used
[INFO] [stdout]   --> src/function/iterator.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub fn inner_iterator() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `out_iterator` is never used
[INFO] [stdout]   --> src/function/iterator.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn out_iterator() {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Counter` is never constructed
[INFO] [stdout]   --> src/function/iterator.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 | struct Counter {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `ExtIteator` is never used
[INFO] [stdout]    --> src/function/iterator.rs:116:11
[INFO] [stdout]     |
[INFO] [stdout] 116 | pub trait ExtIteator: Iterator {
[INFO] [stdout]     |           ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `guss` is never used
[INFO] [stdout]  --> src/guess_number/guess.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn guss() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eg_2` is never used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn eg_2<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_str` is never used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn longest_str<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn longest<'a, 'b: 'a>(a: &'a str, b: &'b str) -> &'a str {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Foo` is never used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:51:7
[INFO] [stdout]    |
[INFO] [stdout] 51 | trait Foo<'a> {}
[INFO] [stdout]    |       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `FooImpl` is never constructed
[INFO] [stdout]   --> src/lifetime/lifetime.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | struct FooImpl<'a> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fool` is never used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn fool<'a>(s: &'a str) -> Box<dyn Foo<'a> + 'a> {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `empty` is never used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 | pub fn empty() {}
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eg_1` is never used
[INFO] [stdout]  --> src/lifetime/smartptr_ownership.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn eg_1() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eg_2` is never used
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn eg_2() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eg_rc` is never used
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn eg_rc() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Foo` is never constructed
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | struct Foo {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:48:4
[INFO] [stdout]    |
[INFO] [stdout] 48 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `refcell` is never used
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:69:4
[INFO] [stdout]    |
[INFO] [stdout] 69 | fn refcell() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `abs_all` is never used
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn abs_all(v: &mut Cow<[i32]>) {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `cowref` is never used
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:89:4
[INFO] [stdout]    |
[INFO] [stdout] 89 | fn cowref() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Book` is never constructed
[INFO] [stdout]   --> src/oop/mod.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct Book<'a> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `red`, `blue`, `yellow`, `on_red`, `on_blue`, and `on_yellow` are never used
[INFO] [stdout]   --> src/oop/color.rs:59:8
[INFO] [stdout]    |
[INFO] [stdout] 58 | pub trait Colorized {
[INFO] [stdout]    |           --------- methods in this trait
[INFO] [stdout] 59 |     fn red(self) -> ColorString;
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 60 |     fn blue(self) -> ColorString;
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 61 |     fn yellow(self) -> ColorString;
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 62 |     fn color<S: Into<Color>>(self, color: S) -> ColorString;
[INFO] [stdout] 63 |     fn on_red(self) -> ColorString;
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 64 |     fn on_blue(self) -> ColorString;
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 65 |     fn on_yellow(self) -> ColorString;
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn ownership() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string_copy` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:65:4
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn string_copy() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `stack_only_data_copy` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:79:4
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn stack_only_data_copy() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_ownership` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:85:4
[INFO] [stdout]    |
[INFO] [stdout] 85 | fn takes_ownership(some_string: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `makes_copy` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:91:4
[INFO] [stdout]    |
[INFO] [stdout] 91 | fn makes_copy(some_integer: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_length` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:96:4
[INFO] [stdout]    |
[INFO] [stdout] 96 | fn calculate_length(s: String) -> (String, usize) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `no_dangle` is never used
[INFO] [stdout]    --> src/ownership/ownership.rs:109:8
[INFO] [stdout]     |
[INFO] [stdout] 109 | pub fn no_dangle() -> String {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/struct_and_enum/enum_demo.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IPAddrKind` is never used
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | enum IPAddrKind {
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IPAddr` is never constructed
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct IPAddr {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:26:6
[INFO] [stdout]    |
[INFO] [stdout] 26 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `call` is never used
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | impl Message {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] 34 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `QuitMesseage` is never constructed
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | struct QuitMesseage;
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MoveMesseage` is never constructed
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 40 | struct MoveMesseage {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `WriteMesseage` is never constructed
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | struct WriteMesseage(String);
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ChangeColorMesseage` is never constructed
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 45 | struct ChangeColorMesseage(i32, i32, i32);
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]  --> src/struct_and_enum/struct_demo.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/struct_and_enum/struct_demo.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_user` is never used
[INFO] [stdout]   --> src/struct_and_enum/struct_demo.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn build_user(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]  --> src/struct_and_enum/struct_example.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Rectangle {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `area`, `can_hold`, and `square` are never used
[INFO] [stdout]   --> src/struct_and_enum/struct_example.rs:8:8
[INFO] [stdout]    |
[INFO] [stdout] 7  | impl Rectangle {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 8  |     fn area(&self) -> u32 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 12 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     fn square(size: u32) -> Rectangle {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/struct_and_enum/struct_example.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area` is never used
[INFO] [stdout]   --> src/struct_and_enum/struct_example.rs:60:4
[INFO] [stdout]    |
[INFO] [stdout] 60 | fn area(rectangle: &Rectangle) -> u32 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/trait_demo/conditionallyimpltrait.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main() {}
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Pair` is never constructed
[INFO] [stdout]  --> src/trait_demo/conditionallyimpltrait.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Pair<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/trait_demo/conditionallyimpltrait.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 9  | impl<T> Pair<T> {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 10 |     fn new(x: T, y: T) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `cmp_display` is never used
[INFO] [stdout]   --> src/trait_demo/conditionallyimpltrait.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl<T: Display + PartialOrd> Pair<T> {
[INFO] [stdout]    | ------------------------------------- method in this implementation
[INFO] [stdout] 16 |     fn cmp_display(&self) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]  --> src/trait_demo/generic.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Point<T, U> {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `mixup` is never used
[INFO] [stdout]  --> src/trait_demo/generic.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl<T, U> Point<T, U> {
[INFO] [stdout]   | ---------------------- method in this implementation
[INFO] [stdout] 7 |     fn mixup<V, W>(self, other: Point<V, W>) -> Point<T, W> {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SinglePoint` is never constructed
[INFO] [stdout]   --> src/trait_demo/generic.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | struct SinglePoint<T> {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `x` is never used
[INFO] [stdout]   --> src/trait_demo/generic.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl<T> SinglePoint<T> {
[INFO] [stdout]    | ---------------------- method in this implementation
[INFO] [stdout] 21 |     fn x(&self) -> &T {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `distance_from_origin` is never used
[INFO] [stdout]   --> src/trait_demo/generic.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl SinglePoint<f32> {
[INFO] [stdout]    | --------------------- method in this implementation
[INFO] [stdout] 27 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/trait_demo/generic.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/trait_demo/largestfunction.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest` is never used
[INFO] [stdout]   --> src/trait_demo/largestfunction.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn largest<T: Copy + PartialOrd>(list: &[T]) -> T {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/trait_demo/lifetime.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]   --> src/trait_demo/lifetime.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ImportantExcerpt` is never constructed
[INFO] [stdout]  --> src/trait_demo/structrefs.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct ImportantExcerpt<'a> {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/trait_demo/structrefs.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_with_an_announcement` is never used
[INFO] [stdout]   --> src/trait_demo/structrefs.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `summarize` is never used
[INFO] [stdout]  --> src/trait_demo/trait_demo.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait Summary {
[INFO] [stdout]   |           ------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 5 |     fn summarize(&self) -> String {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NewsArticle` is never constructed
[INFO] [stdout]   --> src/trait_demo/trait_demo.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct NewsArticle {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]   --> src/trait_demo/trait_demo.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct Tweet {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 20 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 21 |     pub retweet: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/trait_demo/trait_demo.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `summarize_author` and `summarize` are never used
[INFO] [stdout]  --> src/trait_demo/trait_two.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub trait Summary {
[INFO] [stdout]   |           ------- methods in this trait
[INFO] [stdout] 5 |     fn summarize_author(&self) -> String;
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 6 |
[INFO] [stdout] 7 |     fn summarize(&self) -> String {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `content`, `reply`, and `retweet` are never read
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub struct Tweet {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] 13 |     pub username: String,
[INFO] [stdout] 14 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 15 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 16 |     pub retweet: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify` is never used
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 40 | pub fn notify(item: impl Summary) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_actually` is never used
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | pub fn notify_actually<T: Summary>(item: T) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_function` is never used
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:56:4
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `returns_summarized` is never used
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:65:4
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn returns_summarized() -> impl Summary {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `compound_type` is never used
[INFO] [stdout]  --> src/variable/compound_type.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn compound_type() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `flow` is never used
[INFO] [stdout]  --> src/variable/control_flow.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn flow() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `range_with_rev` is never used
[INFO] [stdout]  --> src/variable/control_flow.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn range_with_rev() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `if_condition` is never used
[INFO] [stdout]   --> src/variable/control_flow.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn if_condition() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `condition` is never used
[INFO] [stdout]   --> src/variable/control_flow.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn condition() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loop_demo` is never used
[INFO] [stdout]   --> src/variable/control_flow.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn loop_demo() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loop_with_result` is never used
[INFO] [stdout]   --> src/variable/control_flow.rs:45:4
[INFO] [stdout]    |
[INFO] [stdout] 45 | fn loop_with_result() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `condition_loop_with_while` is never used
[INFO] [stdout]   --> src/variable/control_flow.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn condition_loop_with_while() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loop_with_for` is never used
[INFO] [stdout]   --> src/variable/control_flow.rs:70:4
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn loop_with_for() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `float` is never used
[INFO] [stdout]  --> src/variable/float.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn float() {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_result` is never used
[INFO] [stdout]  --> src/variable/match_pattern.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn match_result() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `UsState` is never used
[INFO] [stdout]   --> src/variable/match_pattern.rs:21:6
[INFO] [stdout]    |
[INFO] [stdout] 21 | enum UsState {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Coin` is never used
[INFO] [stdout]   --> src/variable/match_pattern.rs:28:6
[INFO] [stdout]    |
[INFO] [stdout] 28 | enum Coin {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `value_in_cents` is never used
[INFO] [stdout]   --> src/variable/match_pattern.rs:36:4
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn value_in_cents(coin: Coin) -> u8 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `scala_type` is never used
[INFO] [stdout]  --> src/variable/scala_type.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn scala_type() {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `String::as_str` that must be used
[INFO] [stdout]   --> src/lifetime/lifetime.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     result.as_str();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let _ = result.as_str();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/lifetime/lifetime.rs:16:25
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn eg_2<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stdout]    |                         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ref2`
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let ref2 = vec_ref.borrow_mut();
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_ref2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 132 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/oop/mod.rs:51:13
[INFO] [stdout]    |
[INFO] [stdout] 51 |         let x = PrintDrop("x");
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/oop/mod.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |         let y = PrintDrop("y");
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t1`
[INFO] [stdout]   --> src/oop/mod.rs:58:13
[INFO] [stdout]    |
[INFO] [stdout] 58 |         let t1 = (PrintDrop("x"), PrintDrop("y"), PrintDrop("z"));
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_t1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t2`
[INFO] [stdout]   --> src/oop/mod.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |         let t2 = (PrintDrop("a"), PrintDrop("b"), panic!());
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_t2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:56:24
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn some_function<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/trait_demo/trait_two.rs:56:30
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn some_function<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: `spaces`
[INFO] [stdout]   --> src/variable/scala_type.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let spaces = spaces.len();
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_spaces`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors; 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0796`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_tutorial` (bin "rust_tutorial" test) due to 5 previous errors; 12 warnings emitted
[INFO] [stderr] error: failed to check after updating to 2024
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `cargo check --frozen --all --all-targets --message-format=json` (exit status: 101)
[INFO] running `Command { std: "docker" "inspect" "29060ba70f5432fb0823a3d9fd79f6ecc5fbbe1ba9d811a6ccbf8f07beb0a1d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "29060ba70f5432fb0823a3d9fd79f6ecc5fbbe1ba9d811a6ccbf8f07beb0a1d2", kill_on_drop: false }`
[INFO] [stdout] 29060ba70f5432fb0823a3d9fd79f6ecc5fbbe1ba9d811a6ccbf8f07beb0a1d2