[INFO] cloning repository https://github.com/NeuropathyCC/rust_study
[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 }`
[INFO] [stdout] 4af16b3ed5c18b41e1c71944495e14e632bcfe6a
[INFO] testing NeuropathyCC/rust_study against beta-2021-08-01 for beta-1.55-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNeuropathyCC%2Frust_study" "/workspace/builds/worker-112/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-112/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/NeuropathyCC/rust_study on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/NeuropathyCC/rust_study
[INFO] finished tweaking git repo https://github.com/NeuropathyCC/rust_study
[INFO] tweaked toml for git repo https://github.com/NeuropathyCC/rust_study written to /workspace/builds/worker-112/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-112/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-112/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fa80e6a7b42af7734c09d3065ef88f24f4cac085ccbd199262413e15928994d4
[INFO] running `Command { std: "docker" "start" "-a" "fa80e6a7b42af7734c09d3065ef88f24f4cac085ccbd199262413e15928994d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fa80e6a7b42af7734c09d3065ef88f24f4cac085ccbd199262413e15928994d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa80e6a7b42af7734c09d3065ef88f24f4cac085ccbd199262413e15928994d4", kill_on_drop: false }`
[INFO] [stdout] fa80e6a7b42af7734c09d3065ef88f24f4cac085ccbd199262413e15928994d4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-112/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-112/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ef4853f3977f4a40fab05d612dff862d4e9512553086d3caddbc230fe61cb28c
[INFO] running `Command { std: "docker" "start" "-a" "ef4853f3977f4a40fab05d612dff862d4e9512553086d3caddbc230fe61cb28c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling itertools v0.10.1
[INFO] [stderr]    Compiling mio v0.7.13
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling rustlearning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/borrow/borrow.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let r1 = &mut s;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/borrow/borrow.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let r1 = &s; // no problem
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]   --> src/borrow/borrow.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let r2 = &s; // no problem
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[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:75:13
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let mut 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: `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: unused variable: `t`
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:57:26
[INFO] [stdout]    |
[INFO] [stdout] 57 | fn some_function <T, U> (t: T, u: U) -> i32 where T: Display + Clone, U: Clone + Debug { 
[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:57:32
[INFO] [stdout]    |
[INFO] [stdout] 57 | fn some_function <T, U> (t: T, u: U) -> i32 where T: Display + Clone, U: Clone + Debug { 
[INFO] [stdout]    |                                ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]   --> src/collection_demo/string.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let s2 = String::from("initial contents");
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s3`
[INFO] [stdout]   --> src/collection_demo/string.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let s3 = s1 + &s2; // note s1 has been moved here and can no longer be used
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arr`
[INFO] [stdout]  --> src/collection_demo/vector.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     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: variable does not need to be mutable
[INFO] [stdout]   --> src/borrow/borrow.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let mut s = String::from("hello");
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let mut ref2 = vec_ref.borrow_mut();
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ownership/ownership.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let mut s = String::from("hello");
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/collection_demo/hashmap.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 |    let mut scores: HashMap<_, _> = teams.iter().zip(initial_scores.iter()).collect();
[INFO] [stdout]    |        ----^^^^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/collection_demo/string.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut data = "initial content";
[INFO] [stdout]   |         ----^^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]  --> src/collection_demo/string.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | #[warn(unused_mut)]
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `compute`
[INFO] [stdout]   --> src/borrow/borrow.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn compute(input: &u32, output: &mut u32) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_length`
[INFO] [stdout]   --> src/borrow/borrow.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn calculate_length(s: &String) -> usize { // s is a reference to a String
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `change`
[INFO] [stdout]   --> src/borrow/borrow.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub fn change(some_string: &mut String) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `error_mut_refs`
[INFO] [stdout]   --> src/borrow/borrow.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub fn error_mut_refs() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `problem_mut_refs`
[INFO] [stdout]   --> src/borrow/borrow.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 40 | pub fn problem_mut_refs() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `without_problem_mut_refs`
[INFO] [stdout]   --> src/borrow/borrow.rs:50:8
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub fn without_problem_mut_refs() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `snake_case`
[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 is never used: `fn`
[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 is never used: `f`
[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 is never used: `main`
[INFO] [stdout]   --> src/function/functions.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fm`
[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 is never used: `foo`
[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 is never used: `addsub`
[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 is never used: `square`
[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: associated function is never used: `show`
[INFO] [stdout]   --> src/function/functions.rs:66:8
[INFO] [stdout]    |
[INFO] [stdout] 66 |     fn show(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `show_user`
[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 is never used: `MathOp`
[INFO] [stdout]  --> src/function/higherorderfunction.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | type MathOp = fn(i32, i32) -> i32;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `math`
[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 is never used: `hello`
[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 is never used: `one_arg`
[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 is never used: `main`
[INFO] [stdout]   --> src/function/higherorderfunction.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `counter`
[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 is never used: `closure`
[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: function is never used: `escape_closure`
[INFO] [stdout]    --> src/function/closure.rs:172:8
[INFO] [stdout]     |
[INFO] [stdout] 172 | pub fn escape_closure() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `return_closure`
[INFO] [stdout]    --> src/function/closure.rs:180:8
[INFO] [stdout]     |
[INFO] [stdout] 180 | pub fn return_closure() -> impl Fn(i32) -> i32 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `return_fn_once`
[INFO] [stdout]    --> src/function/closure.rs:184:8
[INFO] [stdout]     |
[INFO] [stdout] 184 | pub fn return_fn_once() -> impl FnOnce(i32) -> i32 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `foo`
[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 is never constructed: `Pick`
[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: associated function is never used: `call`
[INFO] [stdout]   --> src/function/higherrankedlifetime.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn call<'a>(&'a self) -> &'a i32{
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `max`
[INFO] [stdout]   --> src/function/higherrankedlifetime.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn max(data: &(i32, i32)) -> &i32 {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `pick_test`
[INFO] [stdout]   --> src/function/higherrankedlifetime.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | pub fn pick_test() {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `inner_iterator`
[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 is never used: `out_iterator`
[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: function is never used: `eg_2`
[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 is never used: `longest_str`
[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 is never used: `longest`
[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: field is never read: `name`
[INFO] [stdout]   --> src/lifetime/lifetime.rs:53:5
[INFO] [stdout]    |
[INFO] [stdout] 53 |     name: &'a str,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fool`
[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 is never used: `empty`
[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 is never used: `eg_1`
[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 is never used: `eg_2`
[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 is never used: `eg_rc`
[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 is never constructed: `Foo`
[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 is never used: `main`
[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 is never used: `refcell`
[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 is never used: `abs_all`
[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 is never used: `cowref`
[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: function is never used: `ownership`
[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 is never used: `string_copy`
[INFO] [stdout]   --> src/ownership/ownership.rs:66:4
[INFO] [stdout]    |
[INFO] [stdout] 66 | fn string_copy() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `stack_only_data_copy`
[INFO] [stdout]   --> src/ownership/ownership.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn stack_only_data_copy() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `takes_ownership`
[INFO] [stdout]   --> src/ownership/ownership.rs:86:4
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn takes_ownership(some_string: String) { // some_string comes into scope
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `makes_copy`
[INFO] [stdout]   --> src/ownership/ownership.rs:91:4
[INFO] [stdout]    |
[INFO] [stdout] 91 | fn makes_copy(some_integer: i32) { // some_integer comes into scope
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_length`
[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 is never used: `no_dangle`
[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 is never used: `guss`
[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 is never used: `scala_type`
[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: function is never used: `compound_type`
[INFO] [stdout]  --> src/variable/compound_type.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn compound_type() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `flow`
[INFO] [stdout]  --> src/variable/control_flow.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |  fn flow() {
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `range_with_rev`
[INFO] [stdout]  --> src/variable/control_flow.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |  fn range_with_rev() {
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `if_condition`
[INFO] [stdout]   --> src/variable/control_flow.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |  fn if_condition() {
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `condition`
[INFO] [stdout]   --> src/variable/control_flow.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |  fn condition() {
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `loop_demo`
[INFO] [stdout]   --> src/variable/control_flow.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn loop_demo() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `loop_with_result`
[INFO] [stdout]   --> src/variable/control_flow.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn loop_with_result() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `condition_loop_with_while`
[INFO] [stdout]   --> src/variable/control_flow.rs:62:4
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn condition_loop_with_while() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `loop_with_for`
[INFO] [stdout]   --> src/variable/control_flow.rs:74:4
[INFO] [stdout]    |
[INFO] [stdout] 74 | fn loop_with_for() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `float`
[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 is never used: `match_result`
[INFO] [stdout]  --> src/variable/match_pattern.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn match_result() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alabama`
[INFO] [stdout]   --> src/variable/match_pattern.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     Alabama,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alaska`
[INFO] [stdout]   --> src/variable/match_pattern.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     Alaska,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Penny`
[INFO] [stdout]   --> src/variable/match_pattern.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     Penny,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nickel`
[INFO] [stdout]   --> src/variable/match_pattern.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     Nickel,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Dime`
[INFO] [stdout]   --> src/variable/match_pattern.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     Dime,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quarter`
[INFO] [stdout]   --> src/variable/match_pattern.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     Quarter(UsState),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cc`
[INFO] [stdout]   --> src/variable/match_pattern.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     Cc,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `value_in_cents`
[INFO] [stdout]   --> src/variable/match_pattern.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn value_in_cents(coin: Coin) -> u8 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `error`
[INFO] [stdout]  --> src/error/error.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn error() {
[INFO] [stdout]   |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `SERVER`
[INFO] [stdout]  --> src/mio/mio_demo.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | const SERVER:Token = Token(0);
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `CLIENT`
[INFO] [stdout]  --> src/mio/mio_demo.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | const CLIENT:Token = Token(1);
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `demo`
[INFO] [stdout]  --> src/mio/mio_demo.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn demo() -> ioResult<()>{
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/struct_and_enum/enum_demo.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V4`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     V4,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     V6,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     Quit, // has no data associated with it at all
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     Move { x: i32, y: i32 },// includes an anonymous struct inside it
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     Write(String), // includes a single String
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ChangeColor`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     ChangeColor(i32, i32, i32), // includes three i32 values
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `QuitMesseage`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 42 | struct QuitMesseage;
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `MoveMesseage`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct MoveMesseage {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `WriteMesseage`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | struct WriteMesseage(String);
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `ChangeColorMesseage`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 | struct ChangeColorMesseage(i32, i32, i32);
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `User`
[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 is never used: `main`
[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 is never used: `build_user`
[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: associated function is never used: `area`
[INFO] [stdout]  --> src/struct_and_enum/struct_example.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fn area(&self) -> u32{
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/struct_and_enum/struct_example.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `square`
[INFO] [stdout]   --> src/struct_and_enum/struct_example.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn square(size: u32) -> Rectangle {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/struct_and_enum/struct_example.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area`
[INFO] [stdout]   --> src/struct_and_enum/struct_example.rs:46:4
[INFO] [stdout]    |
[INFO] [stdout] 46 | fn area(rectangle: &Rectangle) -> u32 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn main () {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify`
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn notify(item: impl Summary) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify_actually`
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 45 | pub fn notify_actually<T: Summary>(item: T) { 
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_function`
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:57:4
[INFO] [stdout]    |
[INFO] [stdout] 57 | fn some_function <T, U> (t: T, u: U) -> i32 where T: Display + Clone, U: Clone + Debug { 
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `returns_summarized`
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:62:4
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn returns_summarized() -> impl Summary {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[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: function is never used: `main`
[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 is never used: `longest_with_an_announcement`
[INFO] [stdout]   --> src/trait_demo/structrefs.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | 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: function is never used: `main`
[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 is never used: `longest`
[INFO] [stdout]   --> src/trait_demo/lifetime.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/trait_demo/largestfunction.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main () {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest`
[INFO] [stdout]   --> src/trait_demo/largestfunction.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn largest<T: Copy + PartialOrd> (list: &[T]) -> T {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[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: associated function is never used: `mixup`
[INFO] [stdout]  --> src/trait_demo/generic.rs:7:8
[INFO] [stdout]   |
[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 is never constructed: `SinglePoint`
[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: associated function is never used: `x`
[INFO] [stdout]   --> src/trait_demo/generic.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn x(&self) -> &T {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `distance_from_origin`
[INFO] [stdout]   --> src/trait_demo/generic.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[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 is never used: `main`
[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 is never constructed: `Pair`
[INFO] [stdout]  --> src/trait_demo/conditionallyimpltrait.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct Pair<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/trait_demo/conditionallyimpltrait.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 |     fn new(x: T, y: T) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `cmp_display`
[INFO] [stdout]   --> src/trait_demo/conditionallyimpltrait.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn cmp_display(&self) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/collection_demo/hashmap.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `insert_values_no_key`
[INFO] [stdout]   --> src/collection_demo/hashmap.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn insert_values_no_key () {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `counting_occurrences_of_word`
[INFO] [stdout]   --> src/collection_demo/hashmap.rs:39:4
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn counting_occurrences_of_word () {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/collection_demo/string.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `str_concat`
[INFO] [stdout]   --> src/collection_demo/string.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn str_concat() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/collection_demo/vector.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Int`
[INFO] [stdout]   --> src/collection_demo/vector.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 42 |     Int(i32),
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Float`
[INFO] [stdout]   --> src/collection_demo/vector.rs:43:5
[INFO] [stdout]    |
[INFO] [stdout] 43 |     Float(f64),
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Text`
[INFO] [stdout]   --> src/collection_demo/vector.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 |     Text(String),
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `move_str`
[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: field is never read: `value`
[INFO] [stdout]   --> src/main.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     value: i32,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 148 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.89s
[INFO] running `Command { std: "docker" "inspect" "ef4853f3977f4a40fab05d612dff862d4e9512553086d3caddbc230fe61cb28c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef4853f3977f4a40fab05d612dff862d4e9512553086d3caddbc230fe61cb28c", kill_on_drop: false }`
[INFO] [stdout] ef4853f3977f4a40fab05d612dff862d4e9512553086d3caddbc230fe61cb28c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-112/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-112/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 58030e59238d753bcf350612ccbe96571d3c1566a373a8aadda0e4b2a62b7a49
[INFO] running `Command { std: "docker" "start" "-a" "58030e59238d753bcf350612ccbe96571d3c1566a373a8aadda0e4b2a62b7a49", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustlearning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `iterator::ExtIteator`
[INFO] [stdout]   --> src/function/mod.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     use iterator::ExtIteator;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `collections::VecDeque`, `string`, `vec`
[INFO] [stdout]  --> src/collection_demo/mod.rs:6:15
[INFO] [stdout]   |
[INFO] [stdout] 6 |     use std::{collections::VecDeque, string, vec};
[INFO] [stdout]   |               ^^^^^^^^^^^^^^^^^^^^^  ^^^^^^  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/oop/mod.rs:62:17
[INFO] [stdout]    |
[INFO] [stdout] 62 |         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: `r1`
[INFO] [stdout]   --> src/borrow/borrow.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let r1 = &mut s;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/borrow/borrow.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let r1 = &s; // no problem
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]   --> src/borrow/borrow.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let r2 = &s; // no problem
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/borrow/mod.rs:83:13
[INFO] [stdout]    |
[INFO] [stdout] 83 |     fn p<X>(x: X) {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[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:75:13
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let mut 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: `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: unused variable: `t`
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:57:26
[INFO] [stdout]    |
[INFO] [stdout] 57 | fn some_function <T, U> (t: T, u: U) -> i32 where T: Display + Clone, U: Clone + Debug { 
[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:57:32
[INFO] [stdout]    |
[INFO] [stdout] 57 | fn some_function <T, U> (t: T, u: U) -> i32 where T: Display + Clone, U: Clone + Debug { 
[INFO] [stdout]    |                                ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]   --> src/collection_demo/string.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let s2 = String::from("initial contents");
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s3`
[INFO] [stdout]   --> src/collection_demo/string.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let s3 = s1 + &s2; // note s1 has been moved here and can no longer be used
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arr`
[INFO] [stdout]  --> src/collection_demo/vector.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     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: `m`
[INFO] [stdout]   --> src/collection_demo/mod.rs:41:13
[INFO] [stdout]    |
[INFO] [stdout] 41 |         let m = string.matches("tao");
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_m`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string`
[INFO] [stdout]   --> src/collection_demo/mod.rs:44:13
[INFO] [stdout]    |
[INFO] [stdout] 44 |         let string = str.to_string();
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/oop/mod.rs:54:13
[INFO] [stdout]    |
[INFO] [stdout] 54 |         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:55:13
[INFO] [stdout]    |
[INFO] [stdout] 55 |         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:61:13
[INFO] [stdout]    |
[INFO] [stdout] 61 |         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:62:13
[INFO] [stdout]    |
[INFO] [stdout] 62 |         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: variable does not need to be mutable
[INFO] [stdout]   --> src/borrow/borrow.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let mut s = String::from("hello");
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/lifetime/smartptr_ownership.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let mut ref2 = vec_ref.borrow_mut();
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ownership/ownership.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let mut s = String::from("hello");
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/collection_demo/hashmap.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 |    let mut scores: HashMap<_, _> = teams.iter().zip(initial_scores.iter()).collect();
[INFO] [stdout]    |        ----^^^^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/collection_demo/string.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut data = "initial content";
[INFO] [stdout]   |         ----^^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]  --> src/collection_demo/string.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | #[warn(unused_mut)]
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `change`
[INFO] [stdout]   --> src/borrow/borrow.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub fn change(some_string: &mut String) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `error_mut_refs`
[INFO] [stdout]   --> src/borrow/borrow.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub fn error_mut_refs() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `problem_mut_refs`
[INFO] [stdout]   --> src/borrow/borrow.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 40 | pub fn problem_mut_refs() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `without_problem_mut_refs`
[INFO] [stdout]   --> src/borrow/borrow.rs:50:8
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub fn without_problem_mut_refs() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest`
[INFO] [stdout]   --> src/borrow/mod.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 |     fn longest<'a, 'b:'a>(a : &'a str,b: &'b str) -> &'a str{
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `snake_case`
[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 is never used: `fn`
[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 is never used: `f`
[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 is never used: `main`
[INFO] [stdout]   --> src/function/functions.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fm`
[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 is never used: `foo`
[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 is never used: `addsub`
[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 is never used: `square`
[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: associated function is never used: `show`
[INFO] [stdout]   --> src/function/functions.rs:66:8
[INFO] [stdout]    |
[INFO] [stdout] 66 |     fn show(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `show_user`
[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 is never used: `MathOp`
[INFO] [stdout]  --> src/function/higherorderfunction.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | type MathOp = fn(i32, i32) -> i32;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `math`
[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 is never used: `hello`
[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 is never used: `one_arg`
[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 is never used: `main`
[INFO] [stdout]   --> src/function/higherorderfunction.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `counter`
[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 is never used: `eg_2`
[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 is never used: `longest_str`
[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 is never used: `longest`
[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: field is never read: `name`
[INFO] [stdout]   --> src/lifetime/lifetime.rs:53:5
[INFO] [stdout]    |
[INFO] [stdout] 53 |     name: &'a str,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fool`
[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 is never used: `empty`
[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 is never used: `eg_1`
[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 is never used: `eg_2`
[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 is never used: `eg_rc`
[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 is never constructed: `Foo`
[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 is never used: `main`
[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 is never used: `refcell`
[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 is never used: `abs_all`
[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 is never used: `cowref`
[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: function is never used: `ownership`
[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 is never used: `string_copy`
[INFO] [stdout]   --> src/ownership/ownership.rs:66:4
[INFO] [stdout]    |
[INFO] [stdout] 66 | fn string_copy() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `stack_only_data_copy`
[INFO] [stdout]   --> src/ownership/ownership.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn stack_only_data_copy() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `takes_ownership`
[INFO] [stdout]   --> src/ownership/ownership.rs:86:4
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn takes_ownership(some_string: String) { // some_string comes into scope
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `makes_copy`
[INFO] [stdout]   --> src/ownership/ownership.rs:91:4
[INFO] [stdout]    |
[INFO] [stdout] 91 | fn makes_copy(some_integer: i32) { // some_integer comes into scope
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_length`
[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 is never used: `scala_type`
[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: function is never used: `compound_type`
[INFO] [stdout]  --> src/variable/compound_type.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn compound_type() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `flow`
[INFO] [stdout]  --> src/variable/control_flow.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |  fn flow() {
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `range_with_rev`
[INFO] [stdout]  --> src/variable/control_flow.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |  fn range_with_rev() {
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `if_condition`
[INFO] [stdout]   --> src/variable/control_flow.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |  fn if_condition() {
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `condition`
[INFO] [stdout]   --> src/variable/control_flow.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |  fn condition() {
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `loop_demo`
[INFO] [stdout]   --> src/variable/control_flow.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn loop_demo() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `loop_with_result`
[INFO] [stdout]   --> src/variable/control_flow.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn loop_with_result() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `condition_loop_with_while`
[INFO] [stdout]   --> src/variable/control_flow.rs:62:4
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn condition_loop_with_while() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `loop_with_for`
[INFO] [stdout]   --> src/variable/control_flow.rs:74:4
[INFO] [stdout]    |
[INFO] [stdout] 74 | fn loop_with_for() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `float`
[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 is never used: `match_result`
[INFO] [stdout]  --> src/variable/match_pattern.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn match_result() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alabama`
[INFO] [stdout]   --> src/variable/match_pattern.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     Alabama,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alaska`
[INFO] [stdout]   --> src/variable/match_pattern.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     Alaska,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Penny`
[INFO] [stdout]   --> src/variable/match_pattern.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     Penny,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nickel`
[INFO] [stdout]   --> src/variable/match_pattern.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     Nickel,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Dime`
[INFO] [stdout]   --> src/variable/match_pattern.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     Dime,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quarter`
[INFO] [stdout]   --> src/variable/match_pattern.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     Quarter(UsState),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cc`
[INFO] [stdout]   --> src/variable/match_pattern.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     Cc,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `value_in_cents`
[INFO] [stdout]   --> src/variable/match_pattern.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn value_in_cents(coin: Coin) -> u8 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `error`
[INFO] [stdout]  --> src/error/error.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn error() {
[INFO] [stdout]   |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `SERVER`
[INFO] [stdout]  --> src/mio/mio_demo.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | const SERVER:Token = Token(0);
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `CLIENT`
[INFO] [stdout]  --> src/mio/mio_demo.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | const CLIENT:Token = Token(1);
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `demo`
[INFO] [stdout]  --> src/mio/mio_demo.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn demo() -> ioResult<()>{
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/struct_and_enum/enum_demo.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V4`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     V4,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     V6,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     Quit, // has no data associated with it at all
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     Move { x: i32, y: i32 },// includes an anonymous struct inside it
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     Write(String), // includes a single String
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ChangeColor`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     ChangeColor(i32, i32, i32), // includes three i32 values
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `QuitMesseage`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 42 | struct QuitMesseage;
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `MoveMesseage`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct MoveMesseage {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `WriteMesseage`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | struct WriteMesseage(String);
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `ChangeColorMesseage`
[INFO] [stdout]   --> src/struct_and_enum/enum_demo.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 | struct ChangeColorMesseage(i32, i32, i32);
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `User`
[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 is never used: `main`
[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 is never used: `build_user`
[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: associated function is never used: `area`
[INFO] [stdout]  --> src/struct_and_enum/struct_example.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fn area(&self) -> u32{
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/struct_and_enum/struct_example.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `square`
[INFO] [stdout]   --> src/struct_and_enum/struct_example.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn square(size: u32) -> Rectangle {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/struct_and_enum/struct_example.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area`
[INFO] [stdout]   --> src/struct_and_enum/struct_example.rs:46:4
[INFO] [stdout]    |
[INFO] [stdout] 46 | fn area(rectangle: &Rectangle) -> u32 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn main () {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify`
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn notify(item: impl Summary) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify_actually`
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 45 | pub fn notify_actually<T: Summary>(item: T) { 
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_function`
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:57:4
[INFO] [stdout]    |
[INFO] [stdout] 57 | fn some_function <T, U> (t: T, u: U) -> i32 where T: Display + Clone, U: Clone + Debug { 
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `returns_summarized`
[INFO] [stdout]   --> src/trait_demo/trait_two.rs:62:4
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn returns_summarized() -> impl Summary {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[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: function is never used: `main`
[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 is never used: `longest_with_an_announcement`
[INFO] [stdout]   --> src/trait_demo/structrefs.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | 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: function is never used: `main`
[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 is never used: `longest`
[INFO] [stdout]   --> src/trait_demo/lifetime.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/trait_demo/largestfunction.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main () {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest`
[INFO] [stdout]   --> src/trait_demo/largestfunction.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn largest<T: Copy + PartialOrd> (list: &[T]) -> T {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[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: associated function is never used: `mixup`
[INFO] [stdout]  --> src/trait_demo/generic.rs:7:8
[INFO] [stdout]   |
[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 is never constructed: `SinglePoint`
[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: associated function is never used: `x`
[INFO] [stdout]   --> src/trait_demo/generic.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn x(&self) -> &T {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `distance_from_origin`
[INFO] [stdout]   --> src/trait_demo/generic.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[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 is never used: `main`
[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 is never constructed: `Pair`
[INFO] [stdout]  --> src/trait_demo/conditionallyimpltrait.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct Pair<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/trait_demo/conditionallyimpltrait.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 |     fn new(x: T, y: T) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `cmp_display`
[INFO] [stdout]   --> src/trait_demo/conditionallyimpltrait.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn cmp_display(&self) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/collection_demo/hashmap.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `insert_values_no_key`
[INFO] [stdout]   --> src/collection_demo/hashmap.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn insert_values_no_key () {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `counting_occurrences_of_word`
[INFO] [stdout]   --> src/collection_demo/hashmap.rs:39:4
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn counting_occurrences_of_word () {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/collection_demo/string.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `str_concat`
[INFO] [stdout]   --> src/collection_demo/string.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn str_concat() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/collection_demo/vector.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Int`
[INFO] [stdout]   --> src/collection_demo/vector.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 42 |     Int(i32),
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Float`
[INFO] [stdout]   --> src/collection_demo/vector.rs:43:5
[INFO] [stdout]    |
[INFO] [stdout] 43 |     Float(f64),
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Text`
[INFO] [stdout]   --> src/collection_demo/vector.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 |     Text(String),
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `move_str`
[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: 143 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.73s
[INFO] running `Command { std: "docker" "inspect" "58030e59238d753bcf350612ccbe96571d3c1566a373a8aadda0e4b2a62b7a49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "58030e59238d753bcf350612ccbe96571d3c1566a373a8aadda0e4b2a62b7a49", kill_on_drop: false }`
[INFO] [stdout] 58030e59238d753bcf350612ccbe96571d3c1566a373a8aadda0e4b2a62b7a49
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-112/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-112/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 9142ae67ef201f7eef2a4d6efb4217227025c37a98e59fc67766ca49a42cae69
[INFO] running `Command { std: "docker" "start" "-a" "9142ae67ef201f7eef2a4d6efb4217227025c37a98e59fc67766ca49a42cae69", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `iterator::ExtIteator`
[INFO] [stderr]   --> src/function/mod.rs:46:9
[INFO] [stderr]    |
[INFO] [stderr] 46 |     use iterator::ExtIteator;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `collections::VecDeque`, `string`, `vec`
[INFO] [stderr]  --> src/collection_demo/mod.rs:6:15
[INFO] [stderr]   |
[INFO] [stderr] 6 |     use std::{collections::VecDeque, string, vec};
[INFO] [stderr]   |               ^^^^^^^^^^^^^^^^^^^^^  ^^^^^^  ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]   --> src/oop/mod.rs:62:17
[INFO] [stderr]    |
[INFO] [stderr] 62 |         let t2= (PrintDrop("a"), PrintDrop("b"), panic!());
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^--------^
[INFO] [stderr]    |                 |                                |
[INFO] [stderr]    |                 |                                any code following this expression is unreachable
[INFO] [stderr]    |                 unreachable expression
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stderr]   --> src/borrow/borrow.rs:34:9
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let r1 = &mut s;
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stderr]   --> src/borrow/borrow.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 |     let r1 = &s; // no problem
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r2`
[INFO] [stderr]   --> src/borrow/borrow.rs:44:9
[INFO] [stderr]    |
[INFO] [stderr] 44 |     let r2 = &s; // no problem
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/borrow/mod.rs:83:13
[INFO] [stderr]    |
[INFO] [stderr] 83 |     fn p<X>(x: X) {
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]   --> src/lifetime/lifetime.rs:16:25
[INFO] [stderr]    |
[INFO] [stderr] 16 | fn eg_2<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stderr]    |                         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ref2`
[INFO] [stderr]   --> src/lifetime/smartptr_ownership.rs:75:13
[INFO] [stderr]    |
[INFO] [stderr] 75 |     let mut ref2 = vec_ref.borrow_mut();
[INFO] [stderr]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_ref2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `spaces`
[INFO] [stderr]   --> src/variable/scala_type.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |     let spaces = spaces.len();
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_spaces`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `t`
[INFO] [stderr]   --> src/trait_demo/trait_two.rs:57:26
[INFO] [stderr]    |
[INFO] [stderr] 57 | fn some_function <T, U> (t: T, u: U) -> i32 where T: Display + Clone, U: Clone + Debug { 
[INFO] [stderr]    |                          ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `u`
[INFO] [stderr]   --> src/trait_demo/trait_two.rs:57:32
[INFO] [stderr]    |
[INFO] [stderr] 57 | fn some_function <T, U> (t: T, u: U) -> i32 where T: Display + Clone, U: Clone + Debug { 
[INFO] [stderr]    |                                ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s2`
[INFO] [stderr]   --> src/collection_demo/string.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let s2 = String::from("initial contents");
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s3`
[INFO] [stderr]   --> src/collection_demo/string.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 |     let s3 = s1 + &s2; // note s1 has been moved here and can no longer be used
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s3`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `arr`
[INFO] [stderr]  --> src/collection_demo/vector.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let arr = [1, 2, 3];
[INFO] [stderr]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_arr`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `m`
[INFO] [stderr]   --> src/collection_demo/mod.rs:41:13
[INFO] [stderr]    |
[INFO] [stderr] 41 |         let m = string.matches("tao");
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_m`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `string`
[INFO] [stderr]   --> src/collection_demo/mod.rs:44:13
[INFO] [stderr]    |
[INFO] [stderr] 44 |         let string = str.to_string();
[INFO] [stderr]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_string`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/oop/mod.rs:54:13
[INFO] [stderr]    |
[INFO] [stderr] 54 |         let x = PrintDrop("x");
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/oop/mod.rs:55:13
[INFO] [stderr]    |
[INFO] [stderr] 55 |         let y = PrintDrop("y");
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `t1`
[INFO] [stderr]   --> src/oop/mod.rs:61:13
[INFO] [stderr]    |
[INFO] [stderr] 61 |         let t1= (PrintDrop("x"), PrintDrop("y"), PrintDrop("z"));
[INFO] [stderr]    |             ^^ help: if this is intentional, prefix it with an underscore: `_t1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `t2`
[INFO] [stderr]   --> src/oop/mod.rs:62:13
[INFO] [stderr]    |
[INFO] [stderr] 62 |         let t2= (PrintDrop("a"), PrintDrop("b"), panic!());
[INFO] [stderr]    |             ^^ help: if this is intentional, prefix it with an underscore: `_t2`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/borrow/borrow.rs:41:9
[INFO] [stderr]    |
[INFO] [stderr] 41 |     let mut s = String::from("hello");
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lifetime/smartptr_ownership.rs:75:9
[INFO] [stderr]    |
[INFO] [stderr] 75 |     let mut ref2 = vec_ref.borrow_mut();
[INFO] [stderr]    |         ----^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/ownership/ownership.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 |     let mut s = String::from("hello");
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/collection_demo/hashmap.rs:13:8
[INFO] [stderr]    |
[INFO] [stderr] 13 |    let mut scores: HashMap<_, _> = teams.iter().zip(initial_scores.iter()).collect();
[INFO] [stderr]    |        ----^^^^^^
[INFO] [stderr]    |        |
[INFO] [stderr]    |        help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/collection_demo/string.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let mut data = "initial content";
[INFO] [stderr]   |         ----^^^^
[INFO] [stderr]   |         |
[INFO] [stderr]   |         help: remove this `mut`
[INFO] [stderr]   |
[INFO] [stderr] note: the lint level is defined here
[INFO] [stderr]  --> src/collection_demo/string.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | #[warn(unused_mut)]
[INFO] [stderr]   |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `change`
[INFO] [stderr]   --> src/borrow/borrow.rs:27:8
[INFO] [stderr]    |
[INFO] [stderr] 27 | pub fn change(some_string: &mut String) {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `error_mut_refs`
[INFO] [stderr]   --> src/borrow/borrow.rs:31:8
[INFO] [stderr]    |
[INFO] [stderr] 31 | pub fn error_mut_refs() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `problem_mut_refs`
[INFO] [stderr]   --> src/borrow/borrow.rs:40:8
[INFO] [stderr]    |
[INFO] [stderr] 40 | pub fn problem_mut_refs() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `without_problem_mut_refs`
[INFO] [stderr]   --> src/borrow/borrow.rs:50:8
[INFO] [stderr]    |
[INFO] [stderr] 50 | pub fn without_problem_mut_refs() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest`
[INFO] [stderr]   --> src/borrow/mod.rs:55:8
[INFO] [stderr]    |
[INFO] [stderr] 55 |     fn longest<'a, 'b:'a>(a : &'a str,b: &'b str) -> &'a str{
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `snake_case`
[INFO] [stderr]  --> src/function/functions.rs:3:4
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn snake_case() {}
[INFO] [stderr]   |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fn`
[INFO] [stderr]  --> src/function/functions.rs:4:4
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn r#fn() {}
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `f`
[INFO] [stderr]  --> src/function/functions.rs:8:4
[INFO] [stderr]   |
[INFO] [stderr] 8 | fn f() {
[INFO] [stderr]   |    ^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/function/functions.rs:12:4
[INFO] [stderr]    |
[INFO] [stderr] 12 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fm`
[INFO] [stderr]   --> src/function/functions.rs:37:4
[INFO] [stderr]    |
[INFO] [stderr] 37 | fn fm(ref _s: S) {
[INFO] [stderr]    |    ^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `foo`
[INFO] [stderr]   --> src/function/functions.rs:41:4
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn foo(_: i32) { // 忽略参数
[INFO] [stderr]    |    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `addsub`
[INFO] [stderr]   --> src/function/functions.rs:46:4
[INFO] [stderr]    |
[INFO] [stderr] 46 | fn addsub(x: usize, y: usize) -> (usize, usize) {
[INFO] [stderr]    |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `square`
[INFO] [stderr]   --> src/function/functions.rs:52:4
[INFO] [stderr]    |
[INFO] [stderr] 52 | fn square<T: Mul<Output = T>>(x: T, y: T) -> T {
[INFO] [stderr]    |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `show`
[INFO] [stderr]   --> src/function/functions.rs:66:8
[INFO] [stderr]    |
[INFO] [stderr] 66 |     fn show(&self) {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `show_user`
[INFO] [stderr]   --> src/function/functions.rs:72:4
[INFO] [stderr]    |
[INFO] [stderr] 72 | fn show_user() {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `MathOp`
[INFO] [stderr]  --> src/function/higherorderfunction.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | type MathOp = fn(i32, i32) -> i32;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `math`
[INFO] [stderr]  --> src/function/higherorderfunction.rs:4:4
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn math(op: MathOp, a: i32, b: i32) -> i32 {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `hello`
[INFO] [stderr]  --> src/function/higherorderfunction.rs:9:4
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn hello() {}
[INFO] [stderr]   |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `one_arg`
[INFO] [stderr]   --> src/function/higherorderfunction.rs:11:4
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn one_arg(x: i32) {}
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/function/higherorderfunction.rs:14:4
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `counter`
[INFO] [stderr]   --> src/function/closure.rs:10:4
[INFO] [stderr]    |
[INFO] [stderr] 10 | fn counter(x: i32) -> impl Fn(i32) -> i32 {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `eg_2`
[INFO] [stderr]   --> src/lifetime/lifetime.rs:16:4
[INFO] [stderr]    |
[INFO] [stderr] 16 | fn eg_2<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest_str`
[INFO] [stderr]   --> src/lifetime/lifetime.rs:23:4
[INFO] [stderr]    |
[INFO] [stderr] 23 | fn longest_str<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest`
[INFO] [stderr]   --> src/lifetime/lifetime.rs:32:4
[INFO] [stderr]    |
[INFO] [stderr] 32 | fn longest<'a, 'b: 'a>(a: &'a str, b: &'b str) -> &'a str {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `name`
[INFO] [stderr]   --> src/lifetime/lifetime.rs:53:5
[INFO] [stderr]    |
[INFO] [stderr] 53 |     name: &'a str,
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fool`
[INFO] [stderr]   --> src/lifetime/lifetime.rs:58:4
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn fool<'a>(s: &'a str) -> Box<dyn Foo<'a> + 'a> {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `empty`
[INFO] [stderr]   --> src/lifetime/lifetime.rs:82:8
[INFO] [stderr]    |
[INFO] [stderr] 82 | pub fn empty() {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `eg_1`
[INFO] [stderr]  --> src/lifetime/smartptr_ownership.rs:4:4
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn eg_1() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `eg_2`
[INFO] [stderr]   --> src/lifetime/smartptr_ownership.rs:12:4
[INFO] [stderr]    |
[INFO] [stderr] 12 | fn eg_2() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `eg_rc`
[INFO] [stderr]   --> src/lifetime/smartptr_ownership.rs:26:4
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn eg_rc() {
[INFO] [stderr]    |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Foo`
[INFO] [stderr]   --> src/lifetime/smartptr_ownership.rs:44:8
[INFO] [stderr]    |
[INFO] [stderr] 44 | struct Foo {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/lifetime/smartptr_ownership.rs:48:4
[INFO] [stderr]    |
[INFO] [stderr] 48 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `refcell`
[INFO] [stderr]   --> src/lifetime/smartptr_ownership.rs:69:4
[INFO] [stderr]    |
[INFO] [stderr] 69 | fn refcell() {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `abs_all`
[INFO] [stderr]   --> src/lifetime/smartptr_ownership.rs:81:4
[INFO] [stderr]    |
[INFO] [stderr] 81 | fn abs_all(v: &mut Cow<[i32]>) {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `cowref`
[INFO] [stderr]   --> src/lifetime/smartptr_ownership.rs:89:4
[INFO] [stderr]    |
[INFO] [stderr] 89 | fn cowref() {
[INFO] [stderr]    |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ownership`
[INFO] [stderr]   --> src/ownership/ownership.rs:42:4
[INFO] [stderr]    |
[INFO] [stderr] 42 | fn ownership() {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `string_copy`
[INFO] [stderr]   --> src/ownership/ownership.rs:66:4
[INFO] [stderr]    |
[INFO] [stderr] 66 | fn string_copy() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `stack_only_data_copy`
[INFO] [stderr]   --> src/ownership/ownership.rs:80:4
[INFO] [stderr]    |
[INFO] [stderr] 80 | fn stack_only_data_copy() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `takes_ownership`
[INFO] [stderr]   --> src/ownership/ownership.rs:86:4
[INFO] [stderr]    |
[INFO] [stderr] 86 | fn takes_ownership(some_string: String) { // some_string comes into scope
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `makes_copy`
[INFO] [stderr]   --> src/ownership/ownership.rs:91:4
[INFO] [stderr]    |
[INFO] [stderr] 91 | fn makes_copy(some_integer: i32) { // some_integer comes into scope
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calculate_length`
[INFO] [stderr]   --> src/ownership/ownership.rs:96:4
[INFO] [stderr]    |
[INFO] [stderr] 96 | fn calculate_length(s: String) -> (String, usize) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `scala_type`
[INFO] [stderr]  --> src/variable/scala_type.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn scala_type() {
[INFO] [stderr]   |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `compound_type`
[INFO] [stderr]  --> src/variable/compound_type.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn compound_type() {
[INFO] [stderr]   |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `flow`
[INFO] [stderr]  --> src/variable/control_flow.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 |  fn flow() {
[INFO] [stderr]   |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `range_with_rev`
[INFO] [stderr]  --> src/variable/control_flow.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |  fn range_with_rev() {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `if_condition`
[INFO] [stderr]   --> src/variable/control_flow.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |  fn if_condition() {
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `condition`
[INFO] [stderr]   --> src/variable/control_flow.rs:28:5
[INFO] [stderr]    |
[INFO] [stderr] 28 |  fn condition() {
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `loop_demo`
[INFO] [stderr]   --> src/variable/control_flow.rs:42:4
[INFO] [stderr]    |
[INFO] [stderr] 42 | fn loop_demo() {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `loop_with_result`
[INFO] [stderr]   --> src/variable/control_flow.rs:49:4
[INFO] [stderr]    |
[INFO] [stderr] 49 | fn loop_with_result() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `condition_loop_with_while`
[INFO] [stderr]   --> src/variable/control_flow.rs:62:4
[INFO] [stderr]    |
[INFO] [stderr] 62 | fn condition_loop_with_while() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `loop_with_for`
[INFO] [stderr]   --> src/variable/control_flow.rs:74:4
[INFO] [stderr]    |
[INFO] [stderr] 74 | fn loop_with_for() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `float`
[INFO] [stderr]  --> src/variable/float.rs:2:8
[INFO] [stderr]   |
[INFO] [stderr] 2 | pub fn float() {
[INFO] [stderr]   |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `match_result`
[INFO] [stderr]  --> src/variable/match_pattern.rs:2:8
[INFO] [stderr]   |
[INFO] [stderr] 2 | pub fn match_result() {
[INFO] [stderr]   |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Alabama`
[INFO] [stderr]   --> src/variable/match_pattern.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     Alabama,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Alaska`
[INFO] [stderr]   --> src/variable/match_pattern.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     Alaska,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Penny`
[INFO] [stderr]   --> src/variable/match_pattern.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     Penny,
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Nickel`
[INFO] [stderr]   --> src/variable/match_pattern.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     Nickel,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Dime`
[INFO] [stderr]   --> src/variable/match_pattern.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     Dime,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Quarter`
[INFO] [stderr]   --> src/variable/match_pattern.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 33 |     Quarter(UsState),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Cc`
[INFO] [stderr]   --> src/variable/match_pattern.rs:34:5
[INFO] [stderr]    |
[INFO] [stderr] 34 |     Cc,
[INFO] [stderr]    |     ^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `value_in_cents`
[INFO] [stderr]   --> src/variable/match_pattern.rs:37:4
[INFO] [stderr]    |
[INFO] [stderr] 37 | fn value_in_cents(coin: Coin) -> u8 {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `error`
[INFO] [stderr]  --> src/error/error.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn error() {
[INFO] [stderr]   |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `SERVER`
[INFO] [stderr]  --> src/mio/mio_demo.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | const SERVER:Token = Token(0);
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `CLIENT`
[INFO] [stderr]  --> src/mio/mio_demo.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | const CLIENT:Token = Token(1);
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `demo`
[INFO] [stderr]  --> src/mio/mio_demo.rs:8:8
[INFO] [stderr]   |
[INFO] [stderr] 8 | pub fn demo() -> ioResult<()>{
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/struct_and_enum/enum_demo.rs:2:4
[INFO] [stderr]   |
[INFO] [stderr] 2 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V4`
[INFO] [stderr]   --> src/struct_and_enum/enum_demo.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     V4,
[INFO] [stderr]    |     ^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V6`
[INFO] [stderr]   --> src/struct_and_enum/enum_demo.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     V6,
[INFO] [stderr]    |     ^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Quit`
[INFO] [stderr]   --> src/struct_and_enum/enum_demo.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     Quit, // has no data associated with it at all
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Move`
[INFO] [stderr]   --> src/struct_and_enum/enum_demo.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     Move { x: i32, y: i32 },// includes an anonymous struct inside it
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Write`
[INFO] [stderr]   --> src/struct_and_enum/enum_demo.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     Write(String), // includes a single String
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `ChangeColor`
[INFO] [stderr]   --> src/struct_and_enum/enum_demo.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 33 |     ChangeColor(i32, i32, i32), // includes three i32 values
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `call`
[INFO] [stderr]   --> src/struct_and_enum/enum_demo.rs:37:8
[INFO] [stderr]    |
[INFO] [stderr] 37 |     fn call(&self) {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `QuitMesseage`
[INFO] [stderr]   --> src/struct_and_enum/enum_demo.rs:42:8
[INFO] [stderr]    |
[INFO] [stderr] 42 | struct QuitMesseage;
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `MoveMesseage`
[INFO] [stderr]   --> src/struct_and_enum/enum_demo.rs:43:8
[INFO] [stderr]    |
[INFO] [stderr] 43 | struct MoveMesseage {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `WriteMesseage`
[INFO] [stderr]   --> src/struct_and_enum/enum_demo.rs:47:8
[INFO] [stderr]    |
[INFO] [stderr] 47 | struct WriteMesseage(String);
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ChangeColorMesseage`
[INFO] [stderr]   --> src/struct_and_enum/enum_demo.rs:48:8
[INFO] [stderr]    |
[INFO] [stderr] 48 | struct ChangeColorMesseage(i32, i32, i32);
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `User`
[INFO] [stderr]  --> src/struct_and_enum/struct_demo.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | struct User {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/struct_and_enum/struct_demo.rs:8:4
[INFO] [stderr]   |
[INFO] [stderr] 8 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `build_user`
[INFO] [stderr]   --> src/struct_and_enum/struct_demo.rs:19:4
[INFO] [stderr]    |
[INFO] [stderr] 19 | fn build_user(email: String, username: String) -> User {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `area`
[INFO] [stderr]  --> src/struct_and_enum/struct_example.rs:8:8
[INFO] [stderr]   |
[INFO] [stderr] 8 |     fn area(&self) -> u32{
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `can_hold`
[INFO] [stderr]   --> src/struct_and_enum/struct_example.rs:12:8
[INFO] [stderr]    |
[INFO] [stderr] 12 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `square`
[INFO] [stderr]   --> src/struct_and_enum/struct_example.rs:16:8
[INFO] [stderr]    |
[INFO] [stderr] 16 |     fn square(size: u32) -> Rectangle {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/struct_and_enum/struct_example.rs:22:4
[INFO] [stderr]    |
[INFO] [stderr] 22 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `area`
[INFO] [stderr]   --> src/struct_and_enum/struct_example.rs:46:4
[INFO] [stderr]    |
[INFO] [stderr] 46 | fn area(rectangle: &Rectangle) -> u32 {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/trait_demo/trait_two.rs:26:4
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn main () {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `notify`
[INFO] [stderr]   --> src/trait_demo/trait_two.rs:41:8
[INFO] [stderr]    |
[INFO] [stderr] 41 | pub fn notify(item: impl Summary) {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `notify_actually`
[INFO] [stderr]   --> src/trait_demo/trait_two.rs:45:8
[INFO] [stderr]    |
[INFO] [stderr] 45 | pub fn notify_actually<T: Summary>(item: T) { 
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `some_function`
[INFO] [stderr]   --> src/trait_demo/trait_two.rs:57:4
[INFO] [stderr]    |
[INFO] [stderr] 57 | fn some_function <T, U> (t: T, u: U) -> i32 where T: Display + Clone, U: Clone + Debug { 
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `returns_summarized`
[INFO] [stderr]   --> src/trait_demo/trait_two.rs:62:4
[INFO] [stderr]    |
[INFO] [stderr] 62 | fn returns_summarized() -> impl Summary {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/trait_demo/trait_demo.rs:37:4
[INFO] [stderr]    |
[INFO] [stderr] 37 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/trait_demo/structrefs.rs:6:4
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn main () {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest_with_an_announcement`
[INFO] [stderr]   --> src/trait_demo/structrefs.rs:20:4
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/trait_demo/lifetime.rs:8:4
[INFO] [stderr]   |
[INFO] [stderr] 8 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest`
[INFO] [stderr]   --> src/trait_demo/lifetime.rs:35:4
[INFO] [stderr]    |
[INFO] [stderr] 35 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/trait_demo/largestfunction.rs:2:4
[INFO] [stderr]   |
[INFO] [stderr] 2 | fn main () {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `largest`
[INFO] [stderr]   --> src/trait_demo/largestfunction.rs:14:4
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn largest<T: Copy + PartialOrd> (list: &[T]) -> T {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Point`
[INFO] [stderr]  --> src/trait_demo/generic.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | struct Point<T, U> {
[INFO] [stderr]   |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `mixup`
[INFO] [stderr]  --> src/trait_demo/generic.rs:7:8
[INFO] [stderr]   |
[INFO] [stderr] 7 |     fn mixup<V, W>(self, other: Point<V, W>) -> Point<T, W> {
[INFO] [stderr]   |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `SinglePoint`
[INFO] [stderr]   --> src/trait_demo/generic.rs:15:8
[INFO] [stderr]    |
[INFO] [stderr] 15 | struct SinglePoint<T> {
[INFO] [stderr]    |        ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `x`
[INFO] [stderr]   --> src/trait_demo/generic.rs:21:8
[INFO] [stderr]    |
[INFO] [stderr] 21 |     fn x(&self) -> &T {
[INFO] [stderr]    |        ^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `distance_from_origin`
[INFO] [stderr]   --> src/trait_demo/generic.rs:27:8
[INFO] [stderr]    |
[INFO] [stderr] 27 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/trait_demo/generic.rs:32:4
[INFO] [stderr]    |
[INFO] [stderr] 32 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/trait_demo/conditionallyimpltrait.rs:2:4
[INFO] [stderr]   |
[INFO] [stderr] 2 | fn main () {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Pair`
[INFO] [stderr]  --> src/trait_demo/conditionallyimpltrait.rs:6:8
[INFO] [stderr]   |
[INFO] [stderr] 6 | struct Pair<T> {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/trait_demo/conditionallyimpltrait.rs:12:8
[INFO] [stderr]    |
[INFO] [stderr] 12 |     fn new(x: T, y: T) -> Self {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `cmp_display`
[INFO] [stderr]   --> src/trait_demo/conditionallyimpltrait.rs:21:8
[INFO] [stderr]    |
[INFO] [stderr] 21 |     fn cmp_display(&self) {
[INFO] [stderr]    |        ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/collection_demo/hashmap.rs:2:4
[INFO] [stderr]   |
[INFO] [stderr] 2 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `insert_values_no_key`
[INFO] [stderr]   --> src/collection_demo/hashmap.rs:29:4
[INFO] [stderr]    |
[INFO] [stderr] 29 | fn insert_values_no_key () {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `counting_occurrences_of_word`
[INFO] [stderr]   --> src/collection_demo/hashmap.rs:39:4
[INFO] [stderr]    |
[INFO] [stderr] 39 | fn counting_occurrences_of_word () {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/collection_demo/string.rs:2:4
[INFO] [stderr]   |
[INFO] [stderr] 2 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `str_concat`
[INFO] [stderr]   --> src/collection_demo/string.rs:22:4
[INFO] [stderr]    |
[INFO] [stderr] 22 | fn str_concat() {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]  --> src/collection_demo/vector.rs:2:4
[INFO] [stderr]   |
[INFO] [stderr] 2 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Int`
[INFO] [stderr]   --> src/collection_demo/vector.rs:42:5
[INFO] [stderr]    |
[INFO] [stderr] 42 |     Int(i32),
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Float`
[INFO] [stderr]   --> src/collection_demo/vector.rs:43:5
[INFO] [stderr]    |
[INFO] [stderr] 43 |     Float(f64),
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Text`
[INFO] [stderr]   --> src/collection_demo/vector.rs:44:5
[INFO] [stderr]    |
[INFO] [stderr] 44 |     Text(String),
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `move_str`
[INFO] [stderr]  --> src/concurrency/sendsync.rs:8:8
[INFO] [stderr]   |
[INFO] [stderr] 8 | pub fn move_str() {
[INFO] [stderr]   |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rustlearning` (bin "rustlearning" test) generated 143 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rustlearning-af7fcb0c656efd95)
[INFO] [stdout] 
[INFO] [stdout] running 28 tests
[INFO] [stdout] test borrow::tests::auiz_13 ... ok
[INFO] [stdout] test borrow::tests::borrow_fun ... ok
[INFO] [stdout] test borrow::tests::compute ... ok
[INFO] [stdout] test borrow::tests::early_boound ... ok
[INFO] [stdout] test borrow::tests::replace ... ok
[INFO] [stdout] test borrow::tests::test_mem ... ok
[INFO] [stdout] test collection_demo::tests::string ... ok
[INFO] [stdout] test collection_demo::tests::string_add ... ok
[INFO] [stdout] test collection_demo::tests::string_ops ... ok
[INFO] [stdout] test collection_demo::tests::vec_prealloc ... ok
[INFO] [stdout] test collection_demo::tests::zero_size ... ok
[INFO] [stdout] test concurrency::tests::thread_build ... ok
[INFO] [stdout] test concurrency::tests::thread_local ... ok
[INFO] [stdout] test function::function_test::apply_step ... ok
[INFO] [stdout] test function::function_test::fn_box ... ok
[INFO] [stdout] test function::function_test::closure ... ok
[INFO] [stdout] test function::function_test::higher_ranked_lifetime ... ok
[INFO] [stdout] test function::function_test::inner_iterator ... ok
[INFO] [stdout] test function::function_test::outer_iterator ... ok
[INFO] [stdout] test test::dangling ... ok
[INFO] [stdout] test test::it_works_with_result ... ignored
[INFO] [stdout] test oop::tests::struct_update ... ok
[INFO] [stdout] test oop::tests::color_console ... ok
[INFO] [stdout] test oop::tests::drop ... FAILED
[INFO] [stdout] test test::guess_new_test - should panic ... ok
[INFO] [stdout] test concurrency::tests::test1 ... ok
[INFO] [stdout] test concurrency::tests::park ... ok
[INFO] [stderr] error: test failed, to rerun pass '--bin rustlearning'
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/deps/rustlearning-af7fcb0c656efd95` (signal: 9, SIGKILL: kill)
[INFO] running `Command { std: "docker" "inspect" "9142ae67ef201f7eef2a4d6efb4217227025c37a98e59fc67766ca49a42cae69", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9142ae67ef201f7eef2a4d6efb4217227025c37a98e59fc67766ca49a42cae69", kill_on_drop: false }`
[INFO] [stdout] 9142ae67ef201f7eef2a4d6efb4217227025c37a98e59fc67766ca49a42cae69
