[INFO] cloning repository https://github.com/z596593851/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/z596593851/rust_study" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fz596593851%2Frust_study", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fz596593851%2Frust_study'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3a3c855e41b06a171e7bdcc9835ba958562cf689
[INFO] testing z596593851/rust_study against 1.90.0 for beta-1.91-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fz596593851%2Frust_study" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/z596593851/rust_study
[INFO] finished tweaking git repo https://github.com/z596593851/rust_study
[INFO] tweaked toml for git repo https://github.com/z596593851/rust_study written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/z596593851/rust_study on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/z596593851/rust_study already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded piper v0.2.3
[INFO] [stderr]   Downloaded async-io v2.3.3
[INFO] [stderr]   Downloaded tokio-macros v2.3.0
[INFO] [stderr]   Downloaded polling v3.7.1
[INFO] [stderr]   Downloaded value-bag v1.9.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 27235ed111822ad1cd36d3440a055b89359e3b44e652fdd819a2ded7784a06ce
[INFO] running `Command { std: "docker" "start" "-a" "27235ed111822ad1cd36d3440a055b89359e3b44e652fdd819a2ded7784a06ce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "27235ed111822ad1cd36d3440a055b89359e3b44e652fdd819a2ded7784a06ce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "27235ed111822ad1cd36d3440a055b89359e3b44e652fdd819a2ded7784a06ce", kill_on_drop: false }`
[INFO] [stdout] 27235ed111822ad1cd36d3440a055b89359e3b44e652fdd819a2ded7784a06ce
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b2286252ed6482ee81ec782a25922719f1a3987fb62d7b247174e1c9ef0796e8
[INFO] running `Command { std: "docker" "start" "-a" "b2286252ed6482ee81ec782a25922719f1a3987fb62d7b247174e1c9ef0796e8", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.85
[INFO] [stderr]    Compiling rustix v0.38.34
[INFO] [stderr]    Compiling concurrent-queue v2.5.0
[INFO] [stderr]    Compiling io-lifetimes v1.0.11
[INFO] [stderr]    Compiling value-bag v1.9.0
[INFO] [stderr]    Compiling tracing-core v0.1.32
[INFO] [stderr]    Compiling polling v2.8.0
[INFO] [stderr]    Compiling futures-sink v0.3.30
[INFO] [stderr]    Compiling event-listener v2.5.3
[INFO] [stderr]    Compiling rustix v0.37.27
[INFO] [stderr]    Compiling event-listener v5.3.1
[INFO] [stderr]    Compiling log v0.4.21
[INFO] [stderr]    Compiling piper v0.2.3
[INFO] [stderr]    Compiling futures-channel v0.3.30
[INFO] [stderr]    Compiling event-listener-strategy v0.5.2
[INFO] [stderr]    Compiling tracing v0.1.40
[INFO] [stderr]    Compiling async-lock v3.4.0
[INFO] [stderr]    Compiling async-channel v2.3.1
[INFO] [stderr]    Compiling async-io v1.13.0
[INFO] [stderr]    Compiling fastrand v1.9.0
[INFO] [stderr]    Compiling quote v1.0.36
[INFO] [stderr]    Compiling linux-raw-sys v0.3.8
[INFO] [stderr]    Compiling waker-fn v1.2.0
[INFO] [stderr]    Compiling blocking v1.6.1
[INFO] [stderr]    Compiling futures-lite v1.13.0
[INFO] [stderr]    Compiling async-lock v2.8.0
[INFO] [stderr]    Compiling syn v2.0.66
[INFO] [stderr]    Compiling async-executor v1.12.0
[INFO] [stderr]    Compiling num_cpus v1.16.0
[INFO] [stderr]    Compiling socket2 v0.4.10
[INFO] [stderr]    Compiling mio v0.8.11
[INFO] [stderr]    Compiling kv-log-macro v1.0.7
[INFO] [stderr]    Compiling async-channel v1.9.0
[INFO] [stderr]    Compiling futures-macro v0.3.30
[INFO] [stderr]    Compiling tokio-macros v2.3.0
[INFO] [stderr]    Compiling polling v3.7.1
[INFO] [stderr]    Compiling tokio v1.38.0
[INFO] [stderr]    Compiling async-io v2.3.3
[INFO] [stderr]    Compiling futures-util v0.3.30
[INFO] [stderr]    Compiling async-global-executor v2.4.1
[INFO] [stderr]    Compiling async-std v1.12.0
[INFO] [stderr]    Compiling futures-executor v0.3.30
[INFO] [stderr]    Compiling futures v0.3.30
[INFO] [stderr]    Compiling tokio-stream v0.1.15
[INFO] [stderr]    Compiling demo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::any::Any`
[INFO] [stdout]  --> src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::any::Any;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/some_thing/hash_demo.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Debug`
[INFO] [stdout]  --> src/some_thing/thread_demo.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::Debug;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Arc`, `Mutex`, and `mpsc`
[INFO] [stdout]  --> src/some_thing/thread_demo.rs:2:17
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::sync::{Arc, mpsc, Mutex};
[INFO] [stdout]   |                 ^^^  ^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]  --> src/some_thing/thread_demo.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::thread;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::time::Duration`
[INFO] [stdout]  --> src/some_thing/thread_demo.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::time::Duration;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::mpsc`
[INFO] [stdout]  --> src/some_thing/pin_test/pin3_demo.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::sync::mpsc;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Duration` and `self`
[INFO] [stdout]  --> src/some_thing/select_test/select1.rs:6:26
[INFO] [stdout]   |
[INFO] [stdout] 6 | use tokio::{self, time::{self, Duration}};
[INFO] [stdout]   |                          ^^^^  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::join`
[INFO] [stdout]   --> src/some_thing/async_test.rs:2:5
[INFO] [stdout]    |
[INFO] [stdout]  2 | use tokio::join;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: if this is a test module, consider adding a `#[cfg(test)]` to the containing module
[INFO] [stdout]   --> src/some_thing.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | mod async_test;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]   --> src/exercise/iterators/iterators3.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use std::error::Error;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::Arc`
[INFO] [stdout]   --> src/exercise/smart_pointers/arc1.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | use std::sync::Arc;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> src/exercise/smart_pointers/arc1.rs:26:11
[INFO] [stdout]    |
[INFO] [stdout] 26 | #![forbid(unused_imports)]
[INFO] [stdout]    |           ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]   --> src/exercise/smart_pointers/arc1.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 | use std::thread;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]   --> src/exercise/threads/threads1.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::thread;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Duration` and `Instant`
[INFO] [stdout]   --> src/exercise/threads/threads1.rs:14:17
[INFO] [stdout]    |
[INFO] [stdout] 14 | use std::time::{Duration, Instant};
[INFO] [stdout]    |                 ^^^^^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Arc` and `Mutex`
[INFO] [stdout]   --> src/exercise/threads/threads2.rs:12:17
[INFO] [stdout]    |
[INFO] [stdout] 12 | use std::sync::{Arc, Mutex};
[INFO] [stdout]    |                 ^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]   --> src/exercise/threads/threads2.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::thread;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::time::Duration`
[INFO] [stdout]   --> src/exercise/threads/threads2.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use std::time::Duration;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `my_macro`
[INFO] [stdout]  --> src/exercise/macros/macros1.rs:8:14
[INFO] [stdout]   |
[INFO] [stdout] 8 | macro_rules! my_macro {
[INFO] [stdout]   |              ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_macros)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::my_macro`
[INFO] [stdout]   --> src/exercise/macros/macros3.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use crate::my_macro;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `my_macro`
[INFO] [stdout]  --> src/exercise/macros/macros4.rs:9:14
[INFO] [stdout]   |
[INFO] [stdout] 9 | macro_rules! my_macro {
[INFO] [stdout]   |              ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::future::Future`
[INFO] [stdout]  --> src/async_demo/ayn_demo.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::future::Future;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]  --> src/async_demo/ayn_demo.rs:8:14
[INFO] [stdout]   |
[INFO] [stdout] 8 |     for i in (0..4) {
[INFO] [stdout]   |              ^    ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]   |
[INFO] [stdout] 8 -     for i in (0..4) {
[INFO] [stdout] 8 +     for i in 0..4 {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:16:14
[INFO] [stdout]    |
[INFO] [stdout] 16 |     for i in (0..4) {
[INFO] [stdout]    |              ^    ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 16 -     for i in (0..4) {
[INFO] [stdout] 16 +     for i in 0..4 {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:23:14
[INFO] [stdout]    |
[INFO] [stdout] 23 |     for i in (0..4) {
[INFO] [stdout]    |              ^    ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 23 -     for i in (0..4) {
[INFO] [stdout] 23 +     for i in 0..4 {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `time::Duration`
[INFO] [stdout]  --> src/async_demo/excutor.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     time::Duration,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::async_demo::waker_test::TimerFuture`
[INFO] [stdout]   --> src/async_demo/excutor.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use crate::async_demo::waker_test::TimerFuture;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]  --> src/async_demo/ayn_demo.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     for i in (0..4) {
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `song`
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:15:20
[INFO] [stdout]    |
[INFO] [stdout] 15 | async fn sing_song(song: Song) {
[INFO] [stdout]    |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_song`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     for i in (0..4) {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     for i in (0..4) {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]  --> src/some_thing/state_demo.rs:4:27
[INFO] [stdout]   |
[INFO] [stdout] 4 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]   |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/exercise/move/move_semantics1.rs:16:13
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
[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/leetcode/reverse_linked_list.rs:51:24
[INFO] [stdout]    |
[INFO] [stdout] 51 |         while let Some(mut cur_node) = head.as_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/leetcode/reverse_linked_list.rs:73:26
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub fn reverse_list5(mut head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |                          ----^^^^
[INFO] [stdout]    |                          |
[INFO] [stdout]    |                          help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `res` is never read
[INFO] [stdout]   --> src/leetcode/merge_two_sorted_lists.rs:79:17
[INFO] [stdout]    |
[INFO] [stdout] 79 |         let mut res = None;
[INFO] [stdout]    |                 ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/lib.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let mut result = search(&config.query, &content);
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]  --> src/some_thing/circle_ref_demo.rs:6:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | enum List {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `tail` is never used
[INFO] [stdout]   --> src/some_thing/circle_ref_demo.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl List {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 12 |     fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `list_to_map` is never used
[INFO] [stdout]  --> src/some_thing/close_demo.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn list_to_map<K, V, T, M, N>(vec:Vec<T>, m:M, n:N) -> HashMap<K, V>
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]   --> src/some_thing/close_demo.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | struct Person {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `name` and `age` are never used
[INFO] [stdout]   --> src/some_thing/close_demo.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 25 | impl Person {
[INFO] [stdout]    | ----------- methods in this implementation
[INFO] [stdout] 26 |     pub fn name(&self) -> &String {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |     pub fn age(&self) -> i32 {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `list_to_map` is never used
[INFO] [stdout]  --> src/some_thing/close2_demo.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn list_to_map<K, T, M, N>(vec: Vec<T>, m: M, n: N) -> HashMap<K, T>
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]   --> src/some_thing/close2_demo.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Person {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `name` and `age` are never used
[INFO] [stdout]   --> src/some_thing/close2_demo.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl Person {
[INFO] [stdout]    | ----------- methods in this implementation
[INFO] [stdout] 27 |     pub fn name(&self) -> &String {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 31 |     pub fn age(&self) -> i32 {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `list_to_map` is never used
[INFO] [stdout]  --> src/some_thing/close3_demo.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn list_to_map<K, V, T, M, N>(vec: Vec<&T>, m: M, n: N) -> HashMap<K, &V>
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]   --> src/some_thing/close3_demo.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | struct Person {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `name` and `self_ref` are never used
[INFO] [stdout]   --> src/some_thing/close3_demo.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl Person {
[INFO] [stdout]    | ----------- methods in this implementation
[INFO] [stdout] 27 |     pub fn name(&self) -> &String {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 32 |     pub fn self_ref(&self) -> &Self {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/some_thing/tree_demo.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Node {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Draw` is never used
[INFO] [stdout]  --> src/some_thing/trait2_demo.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait Draw {
[INFO] [stdout]   |           ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Screen` is never constructed
[INFO] [stdout]  --> src/some_thing/trait2_demo.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Screen {
[INFO] [stdout]   |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `run` is never used
[INFO] [stdout]   --> src/some_thing/trait2_demo.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout]  9 | impl Screen {
[INFO] [stdout]    | ----------- method in this implementation
[INFO] [stdout] 10 |     pub fn run(&self) {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Button` is never constructed
[INFO] [stdout]   --> src/some_thing/trait2_demo.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct Button {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SelectBox` is never constructed
[INFO] [stdout]   --> src/some_thing/trait2_demo.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | struct SelectBox {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test` is never used
[INFO] [stdout]   --> src/some_thing/trait2_demo.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn test() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `State` is never used
[INFO] [stdout]  --> src/some_thing/state_demo.rs:1:7
[INFO] [stdout]   |
[INFO] [stdout] 1 | trait State {
[INFO] [stdout]   |       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Post` is never constructed
[INFO] [stdout]  --> src/some_thing/state_demo.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub struct Post {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add_text`, `content`, `request_review`, and `approve` are never used
[INFO] [stdout]   --> src/some_thing/state_demo.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl Post {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 15 |     pub fn new() -> Post {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub fn add_text(&mut self, text: &str) {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 26 |     pub fn content(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |     pub fn request_review(&mut self) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn approve(&mut self) {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Draft` is never constructed
[INFO] [stdout]   --> src/some_thing/state_demo.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | struct Draft {}
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PendingReview` is never constructed
[INFO] [stdout]   --> src/some_thing/state_demo.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | struct PendingReview {}
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Published` is never constructed
[INFO] [stdout]   --> src/some_thing/state_demo.rs:67:8
[INFO] [stdout]    |
[INFO] [stdout] 67 | struct Published {}
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test` is never used
[INFO] [stdout]   --> src/some_thing/state_demo.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn test() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `split_at_mut` is never used
[INFO] [stdout]   --> src/some_thing/unsafe_demo.rs:36:4
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn split_at_mut(values: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Test` is never constructed
[INFO] [stdout]  --> src/some_thing/pin_test/pin1_demo.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Test {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `init`, `a`, and `b` are never used
[INFO] [stdout]   --> src/some_thing/pin_test/pin1_demo.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout]  9 | impl Test {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 10 |     fn new(txt: &str) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 17 |     fn init(&mut self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     fn a(&self) -> &str {
[INFO] [stdout]    |        ^
[INFO] [stdout] ...
[INFO] [stdout] 26 |     fn b(&self) -> &String {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Test` is never constructed
[INFO] [stdout]  --> src/some_thing/pin_test/pin2_demo.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Test {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `init`, `a`, and `b` are never used
[INFO] [stdout]   --> src/some_thing/pin_test/pin2_demo.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Test {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 13 |     fn new(txt: &str) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     fn init(self: Pin<&mut Self>) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     fn a(self: Pin<&Self>) -> &str {
[INFO] [stdout]    |        ^
[INFO] [stdout] ...
[INFO] [stdout] 31 |     fn b(self: Pin<&Self>) -> &String {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Test` is never constructed
[INFO] [stdout]  --> src/some_thing/pin_test/pin3_demo.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Test {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `a`, and `b` are never used
[INFO] [stdout]   --> src/some_thing/pin_test/pin3_demo.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl Test {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 14 |     fn new(txt: &str) -> Pin<Box<Self>> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     fn a(self: Pin<&Self>) -> &str {
[INFO] [stdout]    |        ^
[INFO] [stdout] ...
[INFO] [stdout] 31 |     fn b(self: Pin<&Self>) -> &String {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SelfReferential` is never constructed
[INFO] [stdout]  --> src/some_thing/pin_test/pin4_demo.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct SelfReferential {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `init_pointer`, and `get_value` are never used
[INFO] [stdout]   --> src/some_thing/pin_test/pin4_demo.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl SelfReferential {
[INFO] [stdout]    | -------------------- associated items in this implementation
[INFO] [stdout] 12 |     fn new(val: String) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 20 |     fn init_pointer(self: Pin<&mut Self>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 25 |     fn get_value<'a>(self: Pin<&'a Self>) -> &'a String {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/some_thing/pin_test/pin4_demo.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task_one` is never used
[INFO] [stdout]  --> src/some_thing/select_test/select1.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 | async fn task_one() { /* ... */ }
[INFO] [stdout]   |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task_two` is never used
[INFO] [stdout]  --> src/some_thing/select_test/select1.rs:9:10
[INFO] [stdout]   |
[INFO] [stdout] 9 | async fn task_two() { /* ... */ }
[INFO] [stdout]   |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `race_tasks` is never used
[INFO] [stdout]   --> src/some_thing/select_test/select1.rs:11:10
[INFO] [stdout]    |
[INFO] [stdout] 11 | async fn race_tasks() {
[INFO] [stdout]    |          ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task_one` is never used
[INFO] [stdout]  --> src/some_thing/async_test.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 | async fn task_one() {
[INFO] [stdout]   |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task_two` is never used
[INFO] [stdout]   --> src/some_thing/async_test.rs:10:10
[INFO] [stdout]    |
[INFO] [stdout] 10 | async fn task_two() {
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `input` is never used
[INFO] [stdout]  --> src/io_demo/io.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn input() {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Team` is never constructed
[INFO] [stdout]   --> src/exercise/hashmap/hashmap3.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct Team {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_scores_table` is never used
[INFO] [stdout]   --> src/exercise/hashmap/hashmap3.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn build_scores_table(results: String) -> HashMap<String, Team> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `maybe_icecream` is never used
[INFO] [stdout]   --> src/exercise/option/options1.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn maybe_icecream(time_of_day: u16) -> Option<u16> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]  --> src/exercise/option/options3.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct Point {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generate_nametag_text` is never used
[INFO] [stdout]   --> src/exercise/error/errors1.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn generate_nametag_text(name: String) -> Result<String, String> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `total_cost` is never used
[INFO] [stdout]   --> src/exercise/error/errors2.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `total_cost` is never used
[INFO] [stdout]   --> src/exercise/error/errors3.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PositiveNonzeroInteger` is never constructed
[INFO] [stdout]  --> src/exercise/error/errors4.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct PositiveNonzeroInteger(u64);
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `CreationError` is never used
[INFO] [stdout]   --> src/exercise/error/errors4.rs:12:6
[INFO] [stdout]    |
[INFO] [stdout] 12 | enum CreationError {
[INFO] [stdout]    |      ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/exercise/error/errors4.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | impl PositiveNonzeroInteger {
[INFO] [stdout]    | --------------------------- associated function in this implementation
[INFO] [stdout] 18 |     fn new(value: i64) -> Result<PositiveNonzeroInteger, CreationError> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `method` is never used
[INFO] [stdout]   --> src/exercise/error/errors5.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn method() -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PositiveNonzeroInteger` is never constructed
[INFO] [stdout]   --> src/exercise/error/errors5.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | struct PositiveNonzeroInteger(u64);
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `CreationError` is never used
[INFO] [stdout]   --> src/exercise/error/errors5.rs:50:6
[INFO] [stdout]    |
[INFO] [stdout] 50 | enum CreationError {
[INFO] [stdout]    |      ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/exercise/error/errors5.rs:56:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | impl PositiveNonzeroInteger {
[INFO] [stdout]    | --------------------------- associated function in this implementation
[INFO] [stdout] 56 |     fn new(value: i64) -> Result<PositiveNonzeroInteger, CreationError> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ParsePosNonzeroError` is never used
[INFO] [stdout]   --> src/exercise/error/errors6.rs:18:6
[INFO] [stdout]    |
[INFO] [stdout] 18 | enum ParsePosNonzeroError {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `from_creation` and `from_parseint` are never used
[INFO] [stdout]   --> src/exercise/error/errors6.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | impl ParsePosNonzeroError {
[INFO] [stdout]    | ------------------------- associated functions in this implementation
[INFO] [stdout] 24 |     fn from_creation(err: CreationError) -> ParsePosNonzeroError {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 29 |     fn from_parseint(err: ParseIntError) -> ParsePosNonzeroError {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_pos_nonzero` is never used
[INFO] [stdout]   --> src/exercise/error/errors6.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn parse_pos_nonzero(s: &str) -> Result<PositiveNonzeroInteger, ParsePosNonzeroError> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PositiveNonzeroInteger` is never constructed
[INFO] [stdout]   --> src/exercise/error/errors6.rs:51:8
[INFO] [stdout]    |
[INFO] [stdout] 51 | struct PositiveNonzeroInteger(u64);
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `CreationError` is never used
[INFO] [stdout]   --> src/exercise/error/errors6.rs:54:6
[INFO] [stdout]    |
[INFO] [stdout] 54 | enum CreationError {
[INFO] [stdout]    |      ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/exercise/error/errors6.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 59 | impl PositiveNonzeroInteger {
[INFO] [stdout]    | --------------------------- associated function in this implementation
[INFO] [stdout] 60 |     fn new(value: i64) -> Result<PositiveNonzeroInteger, CreationError> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/generics/generics1.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Wrapper` is never constructed
[INFO] [stdout]   --> src/exercise/generics/generics2.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Wrapper<T> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/exercise/generics/generics2.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl <T> Wrapper<T> {
[INFO] [stdout]    | ------------------- associated function in this implementation
[INFO] [stdout] 16 |     pub fn new(value: T) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `AppendBar` is never used
[INFO] [stdout]   --> src/exercise/traits/traits1.rs:12:7
[INFO] [stdout]    |
[INFO] [stdout] 12 | trait AppendBar {
[INFO] [stdout]    |       ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/traits/traits1.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `AppendBar` is never used
[INFO] [stdout]   --> src/exercise/traits/traits2.rs:13:7
[INFO] [stdout]    |
[INFO] [stdout] 13 | trait AppendBar {
[INFO] [stdout]    |       ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Licensed` is never used
[INFO] [stdout]   --> src/exercise/traits/traits3.rs:13:11
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub trait Licensed {
[INFO] [stdout]    |           ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SomeSoftware` is never constructed
[INFO] [stdout]   --> src/exercise/traits/traits3.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | struct SomeSoftware {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `OtherSoftware` is never constructed
[INFO] [stdout]   --> src/exercise/traits/traits3.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct OtherSoftware {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Licensed` is never used
[INFO] [stdout]   --> src/exercise/traits/traits4.rs:12:11
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub trait Licensed {
[INFO] [stdout]    |           ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SomeSoftware` is never constructed
[INFO] [stdout]   --> src/exercise/traits/traits4.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | struct SomeSoftware {}
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `OtherSoftware` is never constructed
[INFO] [stdout]   --> src/exercise/traits/traits4.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct OtherSoftware {}
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `compare_license_types` is never used
[INFO] [stdout]   --> src/exercise/traits/traits4.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn compare_license_types(software: impl Licensed, software_two: impl Licensed) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `SomeTrait` is never used
[INFO] [stdout]   --> src/exercise/traits/traits5.rs:12:11
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub trait SomeTrait {
[INFO] [stdout]    |           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `OtherTrait` is never used
[INFO] [stdout]   --> src/exercise/traits/traits5.rs:18:11
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub trait OtherTrait {
[INFO] [stdout]    |           ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SomeStruct` is never constructed
[INFO] [stdout]   --> src/exercise/traits/traits5.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | struct SomeStruct {}
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `OtherStruct` is never constructed
[INFO] [stdout]   --> src/exercise/traits/traits5.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | struct OtherStruct {}
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_func` is never used
[INFO] [stdout]   --> src/exercise/traits/traits5.rs:33:4
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn some_func(item: impl SomeTrait + OtherTrait) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/traits/traits5.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]   --> src/exercise/lifetimes/lifetimes1.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]   --> src/exercise/lifetimes/lifetimes2.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn longest(x: String, y: String) -> String {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Book` is never constructed
[INFO] [stdout]   --> src/exercise/lifetimes/lifetimes3.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct Book<'a> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `capitalize_first` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators2.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn capitalize_first(input: &str) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `capitalize_words_vector` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators2.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub fn capitalize_words_vector(words: &[&str]) -> Vec<String> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `capitalize_words_string` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators2.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn capitalize_words_string(words: &[&str]) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `DivisionError` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators3.rs:17:10
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub enum DivisionError {
[INFO] [stdout]    |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NotDivisibleError` is never constructed
[INFO] [stdout]   --> src/exercise/iterators/iterators3.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub struct NotDivisibleError {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `divide` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators3.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn divide(a: i32, b: i32) -> Result<i32, DivisionError> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `result_with_list` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators3.rs:48:4
[INFO] [stdout]    |
[INFO] [stdout] 48 | fn result_with_list() -> Result<Vec<i32>, ()> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `list_of_results` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators3.rs:57:4
[INFO] [stdout]    |
[INFO] [stdout] 57 | fn list_of_results() -> Vec<Result<i32, DivisionError>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `factorial` is never used
[INFO] [stdout]  --> src/exercise/iterators/iterators4.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn factorial(num: u64) -> u64 {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Progress` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators5.rs:19:6
[INFO] [stdout]    |
[INFO] [stdout] 19 | enum Progress {
[INFO] [stdout]    |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `count_for` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators5.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn count_for(map: &HashMap<String, Progress>, value: Progress) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `count_iterator` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators5.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn count_iterator(map: &HashMap<String, Progress>, value: Progress) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `count_collection_for` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators5.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn count_collection_for(collection: &[HashMap<String, Progress>], value: Progress) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `count_collection_iterator` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators5.rs:53:4
[INFO] [stdout]    |
[INFO] [stdout] 53 | fn count_collection_iterator(collection: &[HashMap<String, Progress>], value: Progress) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]   --> src/exercise/smart_pointers/box1.rs:25:10
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub enum List {
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/smart_pointers/box1.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `create_empty_list` is never used
[INFO] [stdout]   --> src/exercise/smart_pointers/box1.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | pub fn create_empty_list() -> List {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `create_non_empty_list` is never used
[INFO] [stdout]   --> src/exercise/smart_pointers/box1.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub fn create_non_empty_list() -> List {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `abs_all` is never used
[INFO] [stdout]   --> src/exercise/smart_pointers/cow1.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn abs_all<'a, 'b>(input: &'a mut Cow<'b, [i32]>) -> &'a mut Cow<'b, [i32]> {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Sun` is never constructed
[INFO] [stdout]   --> src/exercise/smart_pointers/rc1.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | struct Sun {}
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Planet` is never used
[INFO] [stdout]   --> src/exercise/smart_pointers/rc1.rs:21:6
[INFO] [stdout]    |
[INFO] [stdout] 21 | enum Planet {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `details` is never used
[INFO] [stdout]   --> src/exercise/smart_pointers/rc1.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | impl Planet {
[INFO] [stdout]    | ----------- method in this implementation
[INFO] [stdout] 33 |     fn details(&self) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `JobStatus` is never constructed
[INFO] [stdout]   --> src/exercise/threads/threads2.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct JobStatus {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Queue` is never constructed
[INFO] [stdout]   --> src/exercise/threads/threads3.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct Queue {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/exercise/threads/threads3.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl Queue {
[INFO] [stdout]    | ---------- associated function in this implementation
[INFO] [stdout] 20 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `send_tx` is never used
[INFO] [stdout]   --> src/exercise/threads/threads3.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn send_tx(q: Queue, tx: Arc<mpsc::Sender<u32>>) -> () {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `send_tx2` is never used
[INFO] [stdout]   --> src/exercise/threads/threads3.rs:48:4
[INFO] [stdout]    |
[INFO] [stdout] 48 | fn send_tx2(q: Queue, tx: mpsc::Sender<u32>) -> () {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/macros/macros2.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `byte_counter` is never used
[INFO] [stdout]   --> src/exercise/conversions/as_ref_mut.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn byte_counter<T: AsRef<str>>(arg: T) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `char_counter` is never used
[INFO] [stdout]   --> src/exercise/conversions/as_ref_mut.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn char_counter<T: AsRef<str>>(arg: T) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `num_sq` is never used
[INFO] [stdout]   --> src/exercise/conversions/as_ref_mut.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn num_sq<T: AsMut<u32>>(arg: &mut T) {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]   --> src/exercise/conversions/from_into.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Person {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/conversions/from_into.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]   --> src/exercise/conversions/from_str.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct Person {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ParsePersonError` is never used
[INFO] [stdout]   --> src/exercise/conversions/from_str.rs:23:6
[INFO] [stdout]    |
[INFO] [stdout] 23 | enum ParsePersonError {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/conversions/from_str.rs:77:4
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]   --> src/exercise/conversions/try_from_into.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | struct Color {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IntoColorError` is never used
[INFO] [stdout]   --> src/exercise/conversions/try_from_into.rs:23:6
[INFO] [stdout]    |
[INFO] [stdout] 23 | enum IntoColorError {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/conversions/try_from_into.rs:98:4
[INFO] [stdout]    |
[INFO] [stdout] 98 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `average` is never used
[INFO] [stdout]   --> src/exercise/conversions/using_as.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn average(values: &[f64]) -> f64 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/conversions/using_as.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/exercise/strings/strings1.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `current_favorite_color` is never used
[INFO] [stdout]   --> src/exercise/strings/strings1.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn current_favorite_color() -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/exercise/strings/strings2.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_a_color_word` is never used
[INFO] [stdout]   --> src/exercise/strings/strings2.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn is_a_color_word(attempt: &str) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `trim_me` is never used
[INFO] [stdout]  --> src/exercise/strings/strings3.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn trim_me(input: &str) -> String {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `compose_me` is never used
[INFO] [stdout]   --> src/exercise/strings/strings3.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn compose_me(input: &str) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `replace_me` is never used
[INFO] [stdout]   --> src/exercise/strings/strings3.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn replace_me(input: &str) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string_slice` is never used
[INFO] [stdout]   --> src/exercise/strings/strings4.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn string_slice(arg: &str) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string` is never used
[INFO] [stdout]   --> src/exercise/strings/strings4.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn string(arg: String) {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/strings/strings4.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]  --> src/exercise/enums/enums1.rs:8:6
[INFO] [stdout]   |
[INFO] [stdout] 8 | enum Message {
[INFO] [stdout]   |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/enums/enums1.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]  --> src/exercise/enums/enums2.rs:8:6
[INFO] [stdout]   |
[INFO] [stdout] 8 | enum Message {
[INFO] [stdout]   |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `call` is never used
[INFO] [stdout]   --> src/exercise/enums/enums2.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl Message {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] 17 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/enums/enums2.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]   --> src/exercise/enums/enums3.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]   --> src/exercise/enums/enums3.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | struct Point {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `State` is never constructed
[INFO] [stdout]   --> src/exercise/enums/enums3.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | struct State {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `change_color`, `quit`, `echo`, `move_position`, and `process` are never used
[INFO] [stdout]   --> src/exercise/enums/enums3.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | impl State {
[INFO] [stdout]    | ---------- methods in this implementation
[INFO] [stdout] 34 |     fn change_color(&mut self, color: (u8, u8, u8)) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 38 |     fn quit(&mut self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 42 |     fn echo(&mut self, s: String) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 46 |     fn move_position(&mut self, p: Point) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 50 |     fn process(&mut self, message: Message) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fill_vec` is never used
[INFO] [stdout]   --> src/exercise/move/move_semantics1.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fill_vec` is never used
[INFO] [stdout]   --> src/exercise/move/move_semantics2.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fill_vec` is never used
[INFO] [stdout]   --> src/exercise/move/move_semantics3.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fill_vec` is never used
[INFO] [stdout]   --> src/exercise/move/move_semantics4.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn fill_vec(vec : Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/exercise/move/move_semantics6.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_char` is never used
[INFO] [stdout]   --> src/exercise/move/move_semantics6.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn get_char(data: &String) -> char {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string_uppercase` is never used
[INFO] [stdout]   --> src/exercise/move/move_semantics6.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn string_uppercase(mut data: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `array_and_vec` is never used
[INFO] [stdout]   --> src/exercise/vecs/vecs1.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn array_and_vec() -> ([i32; 4], Vec<i32>) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vec_loop` is never used
[INFO] [stdout]   --> src/exercise/vecs/vecs2.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn vec_loop(mut v: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vec_map` is never used
[INFO] [stdout]   --> src/exercise/vecs/vecs2.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn vec_map(v: &Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/leetcode/two_sum.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub struct Solution {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `two_sum` is never used
[INFO] [stdout]   --> src/leetcode/two_sum.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl Solution {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 12 |     pub fn two_sum(nums: Vec<i32>, target: i32) -> Vec<i32> {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]   --> src/leetcode/group_anagrams.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub struct Solution {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `BASE` is never used
[INFO] [stdout]   --> src/leetcode/group_anagrams.rs:32:7
[INFO] [stdout]    |
[INFO] [stdout] 32 | const BASE : i32 = 97;
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `group_anagrams` and `encode` are never used
[INFO] [stdout]   --> src/leetcode/group_anagrams.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 34 | impl Solution {
[INFO] [stdout]    | ------------- associated functions in this implementation
[INFO] [stdout] 35 |
[INFO] [stdout] 36 |     pub fn group_anagrams(strs: Vec<String>) -> Vec<Vec<String>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 73 |     pub fn encode(str: &str) -> String {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]   --> src/leetcode/longest_consecutive_sequence.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct Solution {}
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `longest_consecutive` is never used
[INFO] [stdout]   --> src/leetcode/longest_consecutive_sequence.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | impl Solution {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 30 |     pub fn longest_consecutive(nums: Vec<i32>) -> i32 {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test` is never used
[INFO] [stdout]   --> src/leetcode/longest_consecutive_sequence.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub fn test() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]   --> src/leetcode/three_sum.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub struct Solution {}
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `three_sum` is never used
[INFO] [stdout]   --> src/leetcode/three_sum.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 35 | impl Solution {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 36 |     pub fn three_sum(nums: Vec<i32>) -> Vec<Vec<i32>> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ListNode` is never constructed
[INFO] [stdout]  --> src/leetcode/reverse_linked_list.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct ListNode {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/leetcode/reverse_linked_list.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout]  9 | impl ListNode {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 10 |     #[inline]
[INFO] [stdout] 11 |     fn new(val: i32) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]   --> src/leetcode/reverse_linked_list.rs:19:12
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub struct Solution {}
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `reverse_list`, `reverse_list2`, `reverse_list3`, and `reverse_list5` are never used
[INFO] [stdout]   --> src/leetcode/reverse_linked_list.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 21 | impl Solution {
[INFO] [stdout]    | ------------- associated functions in this implementation
[INFO] [stdout] 22 |     pub fn reverse_list(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn reverse_list2(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 48 |     pub fn reverse_list3(mut head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 73 |     pub fn reverse_list5(mut head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ListNode` is never constructed
[INFO] [stdout]  --> src/leetcode/merge_two_sorted_lists.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub struct ListNode {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/leetcode/merge_two_sorted_lists.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl ListNode {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 11 |     #[inline]
[INFO] [stdout] 12 |     fn new(val: i32) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]   --> src/leetcode/merge_two_sorted_lists.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub struct Solution {}
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `merge_two_lists`, `merge_two_lists2`, and `merge_two_lists3` are never used
[INFO] [stdout]   --> src/leetcode/merge_two_sorted_lists.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl Solution {
[INFO] [stdout]    | ------------- associated functions in this implementation
[INFO] [stdout] 23 |     pub fn merge_two_lists(list1: Option<Box<ListNode>>, list2: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 52 |     pub fn merge_two_lists2(list1: Option<Box<ListNode>>, list2: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 72 |     pub fn merge_two_lists3(list1: Option<Box<ListNode>>, list2: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ListNode` is never constructed
[INFO] [stdout]  --> src/leetcode/add_two_numbers.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct ListNode {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/leetcode/add_two_numbers.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl ListNode {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 13 |   #[inline]
[INFO] [stdout] 14 |   fn new(val: i32) -> Self {
[INFO] [stdout]    |      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]   --> src/leetcode/add_two_numbers.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | struct Solution{}
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `add_two_numbers`, `add`, and `one_none` are never used
[INFO] [stdout]   --> src/leetcode/add_two_numbers.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl Solution {
[INFO] [stdout]    | ------------- associated functions in this implementation
[INFO] [stdout] 25 |     pub fn add_two_numbers(l1: Option<Box<ListNode>>, l2: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 29 |     pub fn add(l1: Option<Box<ListNode>>, l2: Option<Box<ListNode>>, x:i32) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 55 |     fn one_none(x: i32, node: Box<ListNode>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ListNode` is never constructed
[INFO] [stdout]  --> src/leetcode/lru.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct ListNode {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/leetcode/lru.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl ListNode {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 14 |     #[inline]
[INFO] [stdout] 15 |     fn new(key: i32, val: i32) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LRUCache` is never constructed
[INFO] [stdout]   --> src/leetcode/lru.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | struct LRUCache {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `get`, `put`, `add_to_head`, `remove_last`, and `move_to_head` are never used
[INFO] [stdout]    --> src/leetcode/lru.rs:36:8
[INFO] [stdout]     |
[INFO] [stdout]  35 | impl LRUCache {
[INFO] [stdout]     | ------------- associated items in this implementation
[INFO] [stdout]  36 |     fn new(capacity: i32) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout]  48 |     fn get(&mut self, key: i32) -> i32 {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout]  58 |     fn put(&mut self, key: i32, value: i32) {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout]  74 |     fn add_to_head(&mut self, node_rc: Rc<RefCell<ListNode>>) {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  91 |     fn remove_last(&mut self) -> i32 {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 102 |     fn move_to_head(&mut self, node_rc: Rc<RefCell<ListNode>>) {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/leetcode/lru2.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Node {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/leetcode/lru2.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Node {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] 13 |     fn new(key: i32, value: i32) -> Rc<RefCell<Self>> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LRUCache` is never constructed
[INFO] [stdout]   --> src/leetcode/lru2.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | struct LRUCache {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `get`, `put`, `remove`, and `push_front` are never used
[INFO] [stdout]   --> src/leetcode/lru2.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl LRUCache {
[INFO] [stdout]    | ------------- associated items in this implementation
[INFO] [stdout] 25 |     pub fn new(capacity: i32) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 32 |     pub fn get(&mut self, key: i32) -> i32 {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 43 |     pub fn put(&mut self, key: i32, value: i32) {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 62 |     fn remove(&mut self, x: Rc<RefCell<Node>>) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 70 |     fn push_front(&mut self, x: Rc<RefCell<Node>>) {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Song` is never constructed
[INFO] [stdout]  --> src/async_demo/ayn_demo.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Song {}
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `learn_song` is never used
[INFO] [stdout]  --> src/async_demo/ayn_demo.rs:7:10
[INFO] [stdout]   |
[INFO] [stdout] 7 | async fn learn_song() -> Song {
[INFO] [stdout]   |          ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sing_song` is never used
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 | async fn sing_song(song: Song) {
[INFO] [stdout]    |          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `dance` is never used
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:22:10
[INFO] [stdout]    |
[INFO] [stdout] 22 | async fn dance() {
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `learn_and_sing` is never used
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:29:10
[INFO] [stdout]    |
[INFO] [stdout] 29 | async fn learn_and_sing() {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `async_main` is never used
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:34:10
[INFO] [stdout]    |
[INFO] [stdout] 34 | async fn async_main() {
[INFO] [stdout]    |          ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TimerFuture` is never constructed
[INFO] [stdout]   --> src/async_demo/waker_test.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct TimerFuture {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SharedState` is never constructed
[INFO] [stdout]   --> src/async_demo/waker_test.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct SharedState {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/async_demo/waker_test.rs:57:12
[INFO] [stdout]    |
[INFO] [stdout] 54 | impl TimerFuture {
[INFO] [stdout]    | ---------------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 57 |     pub fn new(duration: Duration) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Spawner` is never constructed
[INFO] [stdout]   --> src/async_demo/excutor.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | struct Spawner {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `spawn` is never used
[INFO] [stdout]   --> src/async_demo/excutor.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | impl Spawner {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] 24 |     fn spawn(&self, future: impl Future<Output = ()> + 'static + Send) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Executor` is never constructed
[INFO] [stdout]   --> src/async_demo/excutor.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 35 | struct Executor {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `run` is never used
[INFO] [stdout]   --> src/async_demo/excutor.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | impl Executor {
[INFO] [stdout]    | ------------- method in this implementation
[INFO] [stdout] 40 |     fn run(&self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Task` is never constructed
[INFO] [stdout]   --> src/async_demo/excutor.rs:70:8
[INFO] [stdout]    |
[INFO] [stdout] 70 | struct Task {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `new_executor_and_spawner` is never used
[INFO] [stdout]   --> src/async_demo/excutor.rs:98:4
[INFO] [stdout]    |
[INFO] [stdout] 98 | fn new_executor_and_spawner() -> (Executor, Spawner) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]   --> src/exercise/option/options1.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 |     if time_of_day < 0 || time_of_day > 23 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 34.97s
[INFO] running `Command { std: "docker" "inspect" "b2286252ed6482ee81ec782a25922719f1a3987fb62d7b247174e1c9ef0796e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2286252ed6482ee81ec782a25922719f1a3987fb62d7b247174e1c9ef0796e8", kill_on_drop: false }`
[INFO] [stdout] b2286252ed6482ee81ec782a25922719f1a3987fb62d7b247174e1c9ef0796e8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 09304600d0ef52e4932ddb269d08e3d0fe53243be3081e065adbfaf654afe8ee
[INFO] running `Command { std: "docker" "start" "-a" "09304600d0ef52e4932ddb269d08e3d0fe53243be3081e065adbfaf654afe8ee", kill_on_drop: false }`
[INFO] [stdout] warning: unused import: `std::any::Any`
[INFO] [stdout]  --> src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::any::Any;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/some_thing/hash_demo.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Debug`
[INFO] [stdout]  --> src/some_thing/thread_demo.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::Debug;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Arc`, `Mutex`, and `mpsc`
[INFO] [stdout]  --> src/some_thing/thread_demo.rs:2:17
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::sync::{Arc, mpsc, Mutex};
[INFO] [stdout]   |                 ^^^  ^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]  --> src/some_thing/thread_demo.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::thread;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::time::Duration`
[INFO] [stdout]  --> src/some_thing/thread_demo.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::time::Duration;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::mpsc`
[INFO] [stdout]  --> src/some_thing/pin_test/pin3_demo.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::sync::mpsc;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Duration` and `self`
[INFO] [stdout]  --> src/some_thing/select_test/select1.rs:6:26
[INFO] [stdout]   |
[INFO] [stdout] 6 | use tokio::{self, time::{self, Duration}};
[INFO] [stdout]   |                          ^^^^  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::join`
[INFO] [stdout]   --> src/some_thing/async_test.rs:2:5
[INFO] [stdout]    |
[INFO] [stdout]  2 | use tokio::join;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: if this is a test module, consider adding a `#[cfg(test)]` to the containing module
[INFO] [stdout]   --> src/some_thing.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | mod async_test;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]   --> src/exercise/iterators/iterators3.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use std::error::Error;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::Arc`
[INFO] [stdout]   --> src/exercise/smart_pointers/arc1.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | use std::sync::Arc;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> src/exercise/smart_pointers/arc1.rs:26:11
[INFO] [stdout]    |
[INFO] [stdout] 26 | #![forbid(unused_imports)]
[INFO] [stdout]    |           ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]   --> src/exercise/smart_pointers/arc1.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 | use std::thread;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]   --> src/exercise/threads/threads1.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::thread;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Duration` and `Instant`
[INFO] [stdout]   --> src/exercise/threads/threads1.rs:14:17
[INFO] [stdout]    |
[INFO] [stdout] 14 | use std::time::{Duration, Instant};
[INFO] [stdout]    |                 ^^^^^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Arc` and `Mutex`
[INFO] [stdout]   --> src/exercise/threads/threads2.rs:12:17
[INFO] [stdout]    |
[INFO] [stdout] 12 | use std::sync::{Arc, Mutex};
[INFO] [stdout]    |                 ^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]   --> src/exercise/threads/threads2.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::thread;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::time::Duration`
[INFO] [stdout]   --> src/exercise/threads/threads2.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use std::time::Duration;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `my_macro`
[INFO] [stdout]  --> src/exercise/macros/macros1.rs:8:14
[INFO] [stdout]   |
[INFO] [stdout] 8 | macro_rules! my_macro {
[INFO] [stdout]   |              ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_macros)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::my_macro`
[INFO] [stdout]   --> src/exercise/macros/macros3.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use crate::my_macro;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `my_macro`
[INFO] [stdout]  --> src/exercise/macros/macros4.rs:9:14
[INFO] [stdout]   |
[INFO] [stdout] 9 | macro_rules! my_macro {
[INFO] [stdout]   |              ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::future::Future`
[INFO] [stdout]  --> src/async_demo/ayn_demo.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::future::Future;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]  --> src/async_demo/ayn_demo.rs:8:14
[INFO] [stdout]   |
[INFO] [stdout] 8 |     for i in (0..4) {
[INFO] [stdout]   |              ^    ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]   |
[INFO] [stdout] 8 -     for i in (0..4) {
[INFO] [stdout] 8 +     for i in 0..4 {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:16:14
[INFO] [stdout]    |
[INFO] [stdout] 16 |     for i in (0..4) {
[INFO] [stdout]    |              ^    ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 16 -     for i in (0..4) {
[INFO] [stdout] 16 +     for i in 0..4 {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:23:14
[INFO] [stdout]    |
[INFO] [stdout] 23 |     for i in (0..4) {
[INFO] [stdout]    |              ^    ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 23 -     for i in (0..4) {
[INFO] [stdout] 23 +     for i in 0..4 {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `time::Duration`
[INFO] [stdout]  --> src/async_demo/excutor.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     time::Duration,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::async_demo::waker_test::TimerFuture`
[INFO] [stdout]   --> src/async_demo/excutor.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use crate::async_demo::waker_test::TimerFuture;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]  --> src/async_demo/ayn_demo.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     for i in (0..4) {
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `song`
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:15:20
[INFO] [stdout]    |
[INFO] [stdout] 15 | async fn sing_song(song: Song) {
[INFO] [stdout]    |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_song`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     for i in (0..4) {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     for i in (0..4) {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]  --> src/some_thing/state_demo.rs:4:27
[INFO] [stdout]   |
[INFO] [stdout] 4 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]   |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/exercise/move/move_semantics1.rs:16:13
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
[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/leetcode/reverse_linked_list.rs:51:24
[INFO] [stdout]    |
[INFO] [stdout] 51 |         while let Some(mut cur_node) = head.as_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/leetcode/reverse_linked_list.rs:73:26
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub fn reverse_list5(mut head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |                          ----^^^^
[INFO] [stdout]    |                          |
[INFO] [stdout]    |                          help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `res` is never read
[INFO] [stdout]   --> src/leetcode/merge_two_sorted_lists.rs:79:17
[INFO] [stdout]    |
[INFO] [stdout] 79 |         let mut res = None;
[INFO] [stdout]    |                 ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/lib.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let mut result = search(&config.query, &content);
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]  --> src/some_thing/circle_ref_demo.rs:6:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | enum List {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `tail` is never used
[INFO] [stdout]   --> src/some_thing/circle_ref_demo.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl List {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 12 |     fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `list_to_map` is never used
[INFO] [stdout]  --> src/some_thing/close_demo.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn list_to_map<K, V, T, M, N>(vec:Vec<T>, m:M, n:N) -> HashMap<K, V>
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]   --> src/some_thing/close_demo.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | struct Person {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `name` and `age` are never used
[INFO] [stdout]   --> src/some_thing/close_demo.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 25 | impl Person {
[INFO] [stdout]    | ----------- methods in this implementation
[INFO] [stdout] 26 |     pub fn name(&self) -> &String {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |     pub fn age(&self) -> i32 {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `list_to_map` is never used
[INFO] [stdout]  --> src/some_thing/close2_demo.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn list_to_map<K, T, M, N>(vec: Vec<T>, m: M, n: N) -> HashMap<K, T>
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]   --> src/some_thing/close2_demo.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Person {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `name` and `age` are never used
[INFO] [stdout]   --> src/some_thing/close2_demo.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl Person {
[INFO] [stdout]    | ----------- methods in this implementation
[INFO] [stdout] 27 |     pub fn name(&self) -> &String {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 31 |     pub fn age(&self) -> i32 {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `list_to_map` is never used
[INFO] [stdout]  --> src/some_thing/close3_demo.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn list_to_map<K, V, T, M, N>(vec: Vec<&T>, m: M, n: N) -> HashMap<K, &V>
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]   --> src/some_thing/close3_demo.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | struct Person {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `name` and `self_ref` are never used
[INFO] [stdout]   --> src/some_thing/close3_demo.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl Person {
[INFO] [stdout]    | ----------- methods in this implementation
[INFO] [stdout] 27 |     pub fn name(&self) -> &String {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 32 |     pub fn self_ref(&self) -> &Self {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/some_thing/tree_demo.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Node {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Draw` is never used
[INFO] [stdout]  --> src/some_thing/trait2_demo.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait Draw {
[INFO] [stdout]   |           ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Screen` is never constructed
[INFO] [stdout]  --> src/some_thing/trait2_demo.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Screen {
[INFO] [stdout]   |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `run` is never used
[INFO] [stdout]   --> src/some_thing/trait2_demo.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout]  9 | impl Screen {
[INFO] [stdout]    | ----------- method in this implementation
[INFO] [stdout] 10 |     pub fn run(&self) {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Button` is never constructed
[INFO] [stdout]   --> src/some_thing/trait2_demo.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct Button {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SelectBox` is never constructed
[INFO] [stdout]   --> src/some_thing/trait2_demo.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | struct SelectBox {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test` is never used
[INFO] [stdout]   --> src/some_thing/trait2_demo.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn test() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `State` is never used
[INFO] [stdout]  --> src/some_thing/state_demo.rs:1:7
[INFO] [stdout]   |
[INFO] [stdout] 1 | trait State {
[INFO] [stdout]   |       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Post` is never constructed
[INFO] [stdout]  --> src/some_thing/state_demo.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub struct Post {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add_text`, `content`, `request_review`, and `approve` are never used
[INFO] [stdout]   --> src/some_thing/state_demo.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl Post {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 15 |     pub fn new() -> Post {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub fn add_text(&mut self, text: &str) {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 26 |     pub fn content(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |     pub fn request_review(&mut self) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn approve(&mut self) {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Draft` is never constructed
[INFO] [stdout]   --> src/some_thing/state_demo.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | struct Draft {}
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PendingReview` is never constructed
[INFO] [stdout]   --> src/some_thing/state_demo.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | struct PendingReview {}
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Published` is never constructed
[INFO] [stdout]   --> src/some_thing/state_demo.rs:67:8
[INFO] [stdout]    |
[INFO] [stdout] 67 | struct Published {}
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test` is never used
[INFO] [stdout]   --> src/some_thing/state_demo.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn test() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `split_at_mut` is never used
[INFO] [stdout]   --> src/some_thing/unsafe_demo.rs:36:4
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn split_at_mut(values: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Test` is never constructed
[INFO] [stdout]  --> src/some_thing/pin_test/pin1_demo.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Test {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `init`, `a`, and `b` are never used
[INFO] [stdout]   --> src/some_thing/pin_test/pin1_demo.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout]  9 | impl Test {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 10 |     fn new(txt: &str) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 17 |     fn init(&mut self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     fn a(&self) -> &str {
[INFO] [stdout]    |        ^
[INFO] [stdout] ...
[INFO] [stdout] 26 |     fn b(&self) -> &String {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Test` is never constructed
[INFO] [stdout]  --> src/some_thing/pin_test/pin2_demo.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Test {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `init`, `a`, and `b` are never used
[INFO] [stdout]   --> src/some_thing/pin_test/pin2_demo.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Test {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 13 |     fn new(txt: &str) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     fn init(self: Pin<&mut Self>) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     fn a(self: Pin<&Self>) -> &str {
[INFO] [stdout]    |        ^
[INFO] [stdout] ...
[INFO] [stdout] 31 |     fn b(self: Pin<&Self>) -> &String {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Test` is never constructed
[INFO] [stdout]  --> src/some_thing/pin_test/pin3_demo.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Test {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `a`, and `b` are never used
[INFO] [stdout]   --> src/some_thing/pin_test/pin3_demo.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl Test {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 14 |     fn new(txt: &str) -> Pin<Box<Self>> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     fn a(self: Pin<&Self>) -> &str {
[INFO] [stdout]    |        ^
[INFO] [stdout] ...
[INFO] [stdout] 31 |     fn b(self: Pin<&Self>) -> &String {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SelfReferential` is never constructed
[INFO] [stdout]  --> src/some_thing/pin_test/pin4_demo.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct SelfReferential {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `init_pointer`, and `get_value` are never used
[INFO] [stdout]   --> src/some_thing/pin_test/pin4_demo.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl SelfReferential {
[INFO] [stdout]    | -------------------- associated items in this implementation
[INFO] [stdout] 12 |     fn new(val: String) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 20 |     fn init_pointer(self: Pin<&mut Self>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 25 |     fn get_value<'a>(self: Pin<&'a Self>) -> &'a String {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/some_thing/pin_test/pin4_demo.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task_one` is never used
[INFO] [stdout]  --> src/some_thing/select_test/select1.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 | async fn task_one() { /* ... */ }
[INFO] [stdout]   |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task_two` is never used
[INFO] [stdout]  --> src/some_thing/select_test/select1.rs:9:10
[INFO] [stdout]   |
[INFO] [stdout] 9 | async fn task_two() { /* ... */ }
[INFO] [stdout]   |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `race_tasks` is never used
[INFO] [stdout]   --> src/some_thing/select_test/select1.rs:11:10
[INFO] [stdout]    |
[INFO] [stdout] 11 | async fn race_tasks() {
[INFO] [stdout]    |          ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task_one` is never used
[INFO] [stdout]  --> src/some_thing/async_test.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 | async fn task_one() {
[INFO] [stdout]   |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task_two` is never used
[INFO] [stdout]   --> src/some_thing/async_test.rs:10:10
[INFO] [stdout]    |
[INFO] [stdout] 10 | async fn task_two() {
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `input` is never used
[INFO] [stdout]  --> src/io_demo/io.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn input() {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Team` is never constructed
[INFO] [stdout]   --> src/exercise/hashmap/hashmap3.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct Team {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_scores_table` is never used
[INFO] [stdout]   --> src/exercise/hashmap/hashmap3.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn build_scores_table(results: String) -> HashMap<String, Team> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `maybe_icecream` is never used
[INFO] [stdout]   --> src/exercise/option/options1.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn maybe_icecream(time_of_day: u16) -> Option<u16> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]  --> src/exercise/option/options3.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct Point {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generate_nametag_text` is never used
[INFO] [stdout]   --> src/exercise/error/errors1.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn generate_nametag_text(name: String) -> Result<String, String> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `total_cost` is never used
[INFO] [stdout]   --> src/exercise/error/errors2.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `total_cost` is never used
[INFO] [stdout]   --> src/exercise/error/errors3.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PositiveNonzeroInteger` is never constructed
[INFO] [stdout]  --> src/exercise/error/errors4.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct PositiveNonzeroInteger(u64);
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `CreationError` is never used
[INFO] [stdout]   --> src/exercise/error/errors4.rs:12:6
[INFO] [stdout]    |
[INFO] [stdout] 12 | enum CreationError {
[INFO] [stdout]    |      ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/exercise/error/errors4.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | impl PositiveNonzeroInteger {
[INFO] [stdout]    | --------------------------- associated function in this implementation
[INFO] [stdout] 18 |     fn new(value: i64) -> Result<PositiveNonzeroInteger, CreationError> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `method` is never used
[INFO] [stdout]   --> src/exercise/error/errors5.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn method() -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PositiveNonzeroInteger` is never constructed
[INFO] [stdout]   --> src/exercise/error/errors5.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | struct PositiveNonzeroInteger(u64);
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `CreationError` is never used
[INFO] [stdout]   --> src/exercise/error/errors5.rs:50:6
[INFO] [stdout]    |
[INFO] [stdout] 50 | enum CreationError {
[INFO] [stdout]    |      ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/exercise/error/errors5.rs:56:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | impl PositiveNonzeroInteger {
[INFO] [stdout]    | --------------------------- associated function in this implementation
[INFO] [stdout] 56 |     fn new(value: i64) -> Result<PositiveNonzeroInteger, CreationError> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ParsePosNonzeroError` is never used
[INFO] [stdout]   --> src/exercise/error/errors6.rs:18:6
[INFO] [stdout]    |
[INFO] [stdout] 18 | enum ParsePosNonzeroError {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `from_creation` and `from_parseint` are never used
[INFO] [stdout]   --> src/exercise/error/errors6.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | impl ParsePosNonzeroError {
[INFO] [stdout]    | ------------------------- associated functions in this implementation
[INFO] [stdout] 24 |     fn from_creation(err: CreationError) -> ParsePosNonzeroError {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 29 |     fn from_parseint(err: ParseIntError) -> ParsePosNonzeroError {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_pos_nonzero` is never used
[INFO] [stdout]   --> src/exercise/error/errors6.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn parse_pos_nonzero(s: &str) -> Result<PositiveNonzeroInteger, ParsePosNonzeroError> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PositiveNonzeroInteger` is never constructed
[INFO] [stdout]   --> src/exercise/error/errors6.rs:51:8
[INFO] [stdout]    |
[INFO] [stdout] 51 | struct PositiveNonzeroInteger(u64);
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `CreationError` is never used
[INFO] [stdout]   --> src/exercise/error/errors6.rs:54:6
[INFO] [stdout]    |
[INFO] [stdout] 54 | enum CreationError {
[INFO] [stdout]    |      ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/exercise/error/errors6.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 59 | impl PositiveNonzeroInteger {
[INFO] [stdout]    | --------------------------- associated function in this implementation
[INFO] [stdout] 60 |     fn new(value: i64) -> Result<PositiveNonzeroInteger, CreationError> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/generics/generics1.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Wrapper` is never constructed
[INFO] [stdout]   --> src/exercise/generics/generics2.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Wrapper<T> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/exercise/generics/generics2.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl <T> Wrapper<T> {
[INFO] [stdout]    | ------------------- associated function in this implementation
[INFO] [stdout] 16 |     pub fn new(value: T) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `AppendBar` is never used
[INFO] [stdout]   --> src/exercise/traits/traits1.rs:12:7
[INFO] [stdout]    |
[INFO] [stdout] 12 | trait AppendBar {
[INFO] [stdout]    |       ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/traits/traits1.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `AppendBar` is never used
[INFO] [stdout]   --> src/exercise/traits/traits2.rs:13:7
[INFO] [stdout]    |
[INFO] [stdout] 13 | trait AppendBar {
[INFO] [stdout]    |       ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Licensed` is never used
[INFO] [stdout]   --> src/exercise/traits/traits3.rs:13:11
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub trait Licensed {
[INFO] [stdout]    |           ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SomeSoftware` is never constructed
[INFO] [stdout]   --> src/exercise/traits/traits3.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | struct SomeSoftware {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `OtherSoftware` is never constructed
[INFO] [stdout]   --> src/exercise/traits/traits3.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct OtherSoftware {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Licensed` is never used
[INFO] [stdout]   --> src/exercise/traits/traits4.rs:12:11
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub trait Licensed {
[INFO] [stdout]    |           ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SomeSoftware` is never constructed
[INFO] [stdout]   --> src/exercise/traits/traits4.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | struct SomeSoftware {}
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `OtherSoftware` is never constructed
[INFO] [stdout]   --> src/exercise/traits/traits4.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct OtherSoftware {}
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `compare_license_types` is never used
[INFO] [stdout]   --> src/exercise/traits/traits4.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn compare_license_types(software: impl Licensed, software_two: impl Licensed) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `SomeTrait` is never used
[INFO] [stdout]   --> src/exercise/traits/traits5.rs:12:11
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub trait SomeTrait {
[INFO] [stdout]    |           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `OtherTrait` is never used
[INFO] [stdout]   --> src/exercise/traits/traits5.rs:18:11
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub trait OtherTrait {
[INFO] [stdout]    |           ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SomeStruct` is never constructed
[INFO] [stdout]   --> src/exercise/traits/traits5.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | struct SomeStruct {}
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `OtherStruct` is never constructed
[INFO] [stdout]   --> src/exercise/traits/traits5.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | struct OtherStruct {}
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_func` is never used
[INFO] [stdout]   --> src/exercise/traits/traits5.rs:33:4
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn some_func(item: impl SomeTrait + OtherTrait) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/traits/traits5.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]   --> src/exercise/lifetimes/lifetimes1.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]   --> src/exercise/lifetimes/lifetimes2.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn longest(x: String, y: String) -> String {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Book` is never constructed
[INFO] [stdout]   --> src/exercise/lifetimes/lifetimes3.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct Book<'a> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `capitalize_first` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators2.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn capitalize_first(input: &str) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `capitalize_words_vector` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators2.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub fn capitalize_words_vector(words: &[&str]) -> Vec<String> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `capitalize_words_string` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators2.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn capitalize_words_string(words: &[&str]) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `DivisionError` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators3.rs:17:10
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub enum DivisionError {
[INFO] [stdout]    |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NotDivisibleError` is never constructed
[INFO] [stdout]   --> src/exercise/iterators/iterators3.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub struct NotDivisibleError {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `divide` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators3.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn divide(a: i32, b: i32) -> Result<i32, DivisionError> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `result_with_list` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators3.rs:48:4
[INFO] [stdout]    |
[INFO] [stdout] 48 | fn result_with_list() -> Result<Vec<i32>, ()> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `list_of_results` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators3.rs:57:4
[INFO] [stdout]    |
[INFO] [stdout] 57 | fn list_of_results() -> Vec<Result<i32, DivisionError>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `factorial` is never used
[INFO] [stdout]  --> src/exercise/iterators/iterators4.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn factorial(num: u64) -> u64 {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Progress` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators5.rs:19:6
[INFO] [stdout]    |
[INFO] [stdout] 19 | enum Progress {
[INFO] [stdout]    |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `count_for` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators5.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn count_for(map: &HashMap<String, Progress>, value: Progress) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `count_iterator` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators5.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn count_iterator(map: &HashMap<String, Progress>, value: Progress) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `count_collection_for` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators5.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn count_collection_for(collection: &[HashMap<String, Progress>], value: Progress) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `count_collection_iterator` is never used
[INFO] [stdout]   --> src/exercise/iterators/iterators5.rs:53:4
[INFO] [stdout]    |
[INFO] [stdout] 53 | fn count_collection_iterator(collection: &[HashMap<String, Progress>], value: Progress) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]   --> src/exercise/smart_pointers/box1.rs:25:10
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub enum List {
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/smart_pointers/box1.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `create_empty_list` is never used
[INFO] [stdout]   --> src/exercise/smart_pointers/box1.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | pub fn create_empty_list() -> List {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `create_non_empty_list` is never used
[INFO] [stdout]   --> src/exercise/smart_pointers/box1.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub fn create_non_empty_list() -> List {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `abs_all` is never used
[INFO] [stdout]   --> src/exercise/smart_pointers/cow1.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn abs_all<'a, 'b>(input: &'a mut Cow<'b, [i32]>) -> &'a mut Cow<'b, [i32]> {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Sun` is never constructed
[INFO] [stdout]   --> src/exercise/smart_pointers/rc1.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | struct Sun {}
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Planet` is never used
[INFO] [stdout]   --> src/exercise/smart_pointers/rc1.rs:21:6
[INFO] [stdout]    |
[INFO] [stdout] 21 | enum Planet {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `details` is never used
[INFO] [stdout]   --> src/exercise/smart_pointers/rc1.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | impl Planet {
[INFO] [stdout]    | ----------- method in this implementation
[INFO] [stdout] 33 |     fn details(&self) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `JobStatus` is never constructed
[INFO] [stdout]   --> src/exercise/threads/threads2.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct JobStatus {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Queue` is never constructed
[INFO] [stdout]   --> src/exercise/threads/threads3.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct Queue {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/exercise/threads/threads3.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl Queue {
[INFO] [stdout]    | ---------- associated function in this implementation
[INFO] [stdout] 20 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `send_tx` is never used
[INFO] [stdout]   --> src/exercise/threads/threads3.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn send_tx(q: Queue, tx: Arc<mpsc::Sender<u32>>) -> () {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `send_tx2` is never used
[INFO] [stdout]   --> src/exercise/threads/threads3.rs:48:4
[INFO] [stdout]    |
[INFO] [stdout] 48 | fn send_tx2(q: Queue, tx: mpsc::Sender<u32>) -> () {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/macros/macros2.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `byte_counter` is never used
[INFO] [stdout]   --> src/exercise/conversions/as_ref_mut.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn byte_counter<T: AsRef<str>>(arg: T) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `char_counter` is never used
[INFO] [stdout]   --> src/exercise/conversions/as_ref_mut.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn char_counter<T: AsRef<str>>(arg: T) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `num_sq` is never used
[INFO] [stdout]   --> src/exercise/conversions/as_ref_mut.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn num_sq<T: AsMut<u32>>(arg: &mut T) {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]   --> src/exercise/conversions/from_into.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Person {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/conversions/from_into.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]   --> src/exercise/conversions/from_str.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct Person {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ParsePersonError` is never used
[INFO] [stdout]   --> src/exercise/conversions/from_str.rs:23:6
[INFO] [stdout]    |
[INFO] [stdout] 23 | enum ParsePersonError {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/conversions/from_str.rs:77:4
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]   --> src/exercise/conversions/try_from_into.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | struct Color {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IntoColorError` is never used
[INFO] [stdout]   --> src/exercise/conversions/try_from_into.rs:23:6
[INFO] [stdout]    |
[INFO] [stdout] 23 | enum IntoColorError {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/conversions/try_from_into.rs:98:4
[INFO] [stdout]    |
[INFO] [stdout] 98 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `average` is never used
[INFO] [stdout]   --> src/exercise/conversions/using_as.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn average(values: &[f64]) -> f64 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/conversions/using_as.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/exercise/strings/strings1.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `current_favorite_color` is never used
[INFO] [stdout]   --> src/exercise/strings/strings1.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn current_favorite_color() -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/exercise/strings/strings2.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_a_color_word` is never used
[INFO] [stdout]   --> src/exercise/strings/strings2.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn is_a_color_word(attempt: &str) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `trim_me` is never used
[INFO] [stdout]  --> src/exercise/strings/strings3.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn trim_me(input: &str) -> String {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `compose_me` is never used
[INFO] [stdout]   --> src/exercise/strings/strings3.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn compose_me(input: &str) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `replace_me` is never used
[INFO] [stdout]   --> src/exercise/strings/strings3.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn replace_me(input: &str) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string_slice` is never used
[INFO] [stdout]   --> src/exercise/strings/strings4.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn string_slice(arg: &str) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string` is never used
[INFO] [stdout]   --> src/exercise/strings/strings4.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn string(arg: String) {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/strings/strings4.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]  --> src/exercise/enums/enums1.rs:8:6
[INFO] [stdout]   |
[INFO] [stdout] 8 | enum Message {
[INFO] [stdout]   |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/enums/enums1.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]  --> src/exercise/enums/enums2.rs:8:6
[INFO] [stdout]   |
[INFO] [stdout] 8 | enum Message {
[INFO] [stdout]   |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `call` is never used
[INFO] [stdout]   --> src/exercise/enums/enums2.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl Message {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] 17 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/enums/enums2.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]   --> src/exercise/enums/enums3.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]   --> src/exercise/enums/enums3.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | struct Point {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `State` is never constructed
[INFO] [stdout]   --> src/exercise/enums/enums3.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | struct State {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `change_color`, `quit`, `echo`, `move_position`, and `process` are never used
[INFO] [stdout]   --> src/exercise/enums/enums3.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | impl State {
[INFO] [stdout]    | ---------- methods in this implementation
[INFO] [stdout] 34 |     fn change_color(&mut self, color: (u8, u8, u8)) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 38 |     fn quit(&mut self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 42 |     fn echo(&mut self, s: String) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 46 |     fn move_position(&mut self, p: Point) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 50 |     fn process(&mut self, message: Message) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fill_vec` is never used
[INFO] [stdout]   --> src/exercise/move/move_semantics1.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fill_vec` is never used
[INFO] [stdout]   --> src/exercise/move/move_semantics2.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fill_vec` is never used
[INFO] [stdout]   --> src/exercise/move/move_semantics3.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fill_vec` is never used
[INFO] [stdout]   --> src/exercise/move/move_semantics4.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn fill_vec(vec : Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/exercise/move/move_semantics6.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_char` is never used
[INFO] [stdout]   --> src/exercise/move/move_semantics6.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn get_char(data: &String) -> char {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string_uppercase` is never used
[INFO] [stdout]   --> src/exercise/move/move_semantics6.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn string_uppercase(mut data: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `array_and_vec` is never used
[INFO] [stdout]   --> src/exercise/vecs/vecs1.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn array_and_vec() -> ([i32; 4], Vec<i32>) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vec_loop` is never used
[INFO] [stdout]   --> src/exercise/vecs/vecs2.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn vec_loop(mut v: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vec_map` is never used
[INFO] [stdout]   --> src/exercise/vecs/vecs2.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn vec_map(v: &Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/leetcode/two_sum.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub struct Solution {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `two_sum` is never used
[INFO] [stdout]   --> src/leetcode/two_sum.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl Solution {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 12 |     pub fn two_sum(nums: Vec<i32>, target: i32) -> Vec<i32> {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]   --> src/leetcode/group_anagrams.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub struct Solution {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `BASE` is never used
[INFO] [stdout]   --> src/leetcode/group_anagrams.rs:32:7
[INFO] [stdout]    |
[INFO] [stdout] 32 | const BASE : i32 = 97;
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `group_anagrams` and `encode` are never used
[INFO] [stdout]   --> src/leetcode/group_anagrams.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 34 | impl Solution {
[INFO] [stdout]    | ------------- associated functions in this implementation
[INFO] [stdout] 35 |
[INFO] [stdout] 36 |     pub fn group_anagrams(strs: Vec<String>) -> Vec<Vec<String>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 73 |     pub fn encode(str: &str) -> String {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]   --> src/leetcode/longest_consecutive_sequence.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct Solution {}
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `longest_consecutive` is never used
[INFO] [stdout]   --> src/leetcode/longest_consecutive_sequence.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | impl Solution {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 30 |     pub fn longest_consecutive(nums: Vec<i32>) -> i32 {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test` is never used
[INFO] [stdout]   --> src/leetcode/longest_consecutive_sequence.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub fn test() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]   --> src/leetcode/three_sum.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub struct Solution {}
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `three_sum` is never used
[INFO] [stdout]   --> src/leetcode/three_sum.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 35 | impl Solution {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 36 |     pub fn three_sum(nums: Vec<i32>) -> Vec<Vec<i32>> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ListNode` is never constructed
[INFO] [stdout]  --> src/leetcode/reverse_linked_list.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct ListNode {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/leetcode/reverse_linked_list.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout]  9 | impl ListNode {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 10 |     #[inline]
[INFO] [stdout] 11 |     fn new(val: i32) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]   --> src/leetcode/reverse_linked_list.rs:19:12
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub struct Solution {}
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `reverse_list`, `reverse_list2`, `reverse_list3`, and `reverse_list5` are never used
[INFO] [stdout]   --> src/leetcode/reverse_linked_list.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 21 | impl Solution {
[INFO] [stdout]    | ------------- associated functions in this implementation
[INFO] [stdout] 22 |     pub fn reverse_list(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn reverse_list2(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 48 |     pub fn reverse_list3(mut head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 73 |     pub fn reverse_list5(mut head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ListNode` is never constructed
[INFO] [stdout]  --> src/leetcode/merge_two_sorted_lists.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub struct ListNode {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/leetcode/merge_two_sorted_lists.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl ListNode {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 11 |     #[inline]
[INFO] [stdout] 12 |     fn new(val: i32) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]   --> src/leetcode/merge_two_sorted_lists.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub struct Solution {}
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `merge_two_lists`, `merge_two_lists2`, and `merge_two_lists3` are never used
[INFO] [stdout]   --> src/leetcode/merge_two_sorted_lists.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl Solution {
[INFO] [stdout]    | ------------- associated functions in this implementation
[INFO] [stdout] 23 |     pub fn merge_two_lists(list1: Option<Box<ListNode>>, list2: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 52 |     pub fn merge_two_lists2(list1: Option<Box<ListNode>>, list2: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 72 |     pub fn merge_two_lists3(list1: Option<Box<ListNode>>, list2: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ListNode` is never constructed
[INFO] [stdout]  --> src/leetcode/add_two_numbers.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct ListNode {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/leetcode/add_two_numbers.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl ListNode {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 13 |   #[inline]
[INFO] [stdout] 14 |   fn new(val: i32) -> Self {
[INFO] [stdout]    |      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]   --> src/leetcode/add_two_numbers.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | struct Solution{}
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `add_two_numbers`, `add`, and `one_none` are never used
[INFO] [stdout]   --> src/leetcode/add_two_numbers.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl Solution {
[INFO] [stdout]    | ------------- associated functions in this implementation
[INFO] [stdout] 25 |     pub fn add_two_numbers(l1: Option<Box<ListNode>>, l2: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 29 |     pub fn add(l1: Option<Box<ListNode>>, l2: Option<Box<ListNode>>, x:i32) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 55 |     fn one_none(x: i32, node: Box<ListNode>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ListNode` is never constructed
[INFO] [stdout]  --> src/leetcode/lru.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct ListNode {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/leetcode/lru.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl ListNode {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 14 |     #[inline]
[INFO] [stdout] 15 |     fn new(key: i32, val: i32) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LRUCache` is never constructed
[INFO] [stdout]   --> src/leetcode/lru.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | struct LRUCache {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `get`, `put`, `add_to_head`, `remove_last`, and `move_to_head` are never used
[INFO] [stdout]    --> src/leetcode/lru.rs:36:8
[INFO] [stdout]     |
[INFO] [stdout]  35 | impl LRUCache {
[INFO] [stdout]     | ------------- associated items in this implementation
[INFO] [stdout]  36 |     fn new(capacity: i32) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout]  48 |     fn get(&mut self, key: i32) -> i32 {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout]  58 |     fn put(&mut self, key: i32, value: i32) {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout]  74 |     fn add_to_head(&mut self, node_rc: Rc<RefCell<ListNode>>) {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  91 |     fn remove_last(&mut self) -> i32 {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 102 |     fn move_to_head(&mut self, node_rc: Rc<RefCell<ListNode>>) {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/leetcode/lru2.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Node {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/leetcode/lru2.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Node {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] 13 |     fn new(key: i32, value: i32) -> Rc<RefCell<Self>> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LRUCache` is never constructed
[INFO] [stdout]   --> src/leetcode/lru2.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | struct LRUCache {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `get`, `put`, `remove`, and `push_front` are never used
[INFO] [stdout]   --> src/leetcode/lru2.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl LRUCache {
[INFO] [stdout]    | ------------- associated items in this implementation
[INFO] [stdout] 25 |     pub fn new(capacity: i32) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 32 |     pub fn get(&mut self, key: i32) -> i32 {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 43 |     pub fn put(&mut self, key: i32, value: i32) {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 62 |     fn remove(&mut self, x: Rc<RefCell<Node>>) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 70 |     fn push_front(&mut self, x: Rc<RefCell<Node>>) {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Song` is never constructed
[INFO] [stdout]  --> src/async_demo/ayn_demo.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Song {}
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `learn_song` is never used
[INFO] [stdout]  --> src/async_demo/ayn_demo.rs:7:10
[INFO] [stdout]   |
[INFO] [stdout] 7 | async fn learn_song() -> Song {
[INFO] [stdout]   |          ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sing_song` is never used
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 | async fn sing_song(song: Song) {
[INFO] [stdout]    |          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `dance` is never used
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:22:10
[INFO] [stdout]    |
[INFO] [stdout] 22 | async fn dance() {
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `learn_and_sing` is never used
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:29:10
[INFO] [stdout]    |
[INFO] [stdout] 29 | async fn learn_and_sing() {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `async_main` is never used
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:34:10
[INFO] [stdout]    |
[INFO] [stdout] 34 | async fn async_main() {
[INFO] [stdout]    |          ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TimerFuture` is never constructed
[INFO] [stdout]   --> src/async_demo/waker_test.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct TimerFuture {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SharedState` is never constructed
[INFO] [stdout]   --> src/async_demo/waker_test.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct SharedState {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/async_demo/waker_test.rs:57:12
[INFO] [stdout]    |
[INFO] [stdout] 54 | impl TimerFuture {
[INFO] [stdout]    | ---------------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 57 |     pub fn new(duration: Duration) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Spawner` is never constructed
[INFO] [stdout]   --> src/async_demo/excutor.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | struct Spawner {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `spawn` is never used
[INFO] [stdout]   --> src/async_demo/excutor.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | impl Spawner {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] 24 |     fn spawn(&self, future: impl Future<Output = ()> + 'static + Send) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Executor` is never constructed
[INFO] [stdout]   --> src/async_demo/excutor.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 35 | struct Executor {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `run` is never used
[INFO] [stdout]   --> src/async_demo/excutor.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | impl Executor {
[INFO] [stdout]    | ------------- method in this implementation
[INFO] [stdout] 40 |     fn run(&self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Task` is never constructed
[INFO] [stdout]   --> src/async_demo/excutor.rs:70:8
[INFO] [stdout]    |
[INFO] [stdout] 70 | struct Task {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `new_executor_and_spawner` is never used
[INFO] [stdout]   --> src/async_demo/excutor.rs:98:4
[INFO] [stdout]    |
[INFO] [stdout] 98 | fn new_executor_and_spawner() -> (Executor, Spawner) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]   --> src/exercise/option/options1.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 |     if time_of_day < 0 || time_of_day > 23 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling demo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::any::Any`
[INFO] [stdout]  --> src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::any::Any;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Debug`
[INFO] [stdout]  --> src/some_thing/thread_demo.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::Debug;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::mpsc`
[INFO] [stdout]  --> src/some_thing/pin_test/pin3_demo.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::sync::mpsc;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Duration` and `self`
[INFO] [stdout]  --> src/some_thing/select_test/select1.rs:6:26
[INFO] [stdout]   |
[INFO] [stdout] 6 | use tokio::{self, time::{self, Duration}};
[INFO] [stdout]   |                          ^^^^  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]   --> src/exercise/iterators/iterators3.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use std::error::Error;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trailing semicolon in macro used in expression position
[INFO] [stdout]   --> src/exercise/macros/macros1.rs:10:40
[INFO] [stdout]    |
[INFO] [stdout] 10 |         println!("Check out my macro!");
[INFO] [stdout]    |                                        ^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     my_macro!()
[INFO] [stdout]    |     ----------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
[INFO] [stdout]    = note: macro invocations at the end of a block are treated as expressions
[INFO] [stdout]    = note: to ignore the value produced by the macro, add a semicolon after the invocation of `my_macro`
[INFO] [stdout]    = note: `#[warn(semicolon_in_expressions_from_macros)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `my_macro` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]    --> src/leetcode/merge_two_sorted_lists.rs:115:9
[INFO] [stdout]     |
[INFO] [stdout] 115 |     use super::*;
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::future::Future`
[INFO] [stdout]  --> src/async_demo/ayn_demo.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::future::Future;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]  --> src/async_demo/ayn_demo.rs:8:14
[INFO] [stdout]   |
[INFO] [stdout] 8 |     for i in (0..4) {
[INFO] [stdout]   |              ^    ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]   |
[INFO] [stdout] 8 -     for i in (0..4) {
[INFO] [stdout] 8 +     for i in 0..4 {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:16:14
[INFO] [stdout]    |
[INFO] [stdout] 16 |     for i in (0..4) {
[INFO] [stdout]    |              ^    ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 16 -     for i in (0..4) {
[INFO] [stdout] 16 +     for i in 0..4 {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:23:14
[INFO] [stdout]    |
[INFO] [stdout] 23 |     for i in (0..4) {
[INFO] [stdout]    |              ^    ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 23 -     for i in (0..4) {
[INFO] [stdout] 23 +     for i in 0..4 {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]  --> src/async_demo/ayn_demo.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     for i in (0..4) {
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `song`
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:15:20
[INFO] [stdout]    |
[INFO] [stdout] 15 | async fn sing_song(song: Song) {
[INFO] [stdout]    |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_song`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     for i in (0..4) {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     for i in (0..4) {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]  --> src/some_thing/state_demo.rs:4:27
[INFO] [stdout]   |
[INFO] [stdout] 4 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]   |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]  --> src/some_thing/unsafe_demo.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let r1 = &num as *const i32;
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/some_thing/unsafe_demo.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let mut k = &mut num;
[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/exercise/move/move_semantics1.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let mut vec0 = vec![22, 44, 66];
[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/exercise/move/move_semantics1.rs:16:13
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
[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/leetcode/reverse_linked_list.rs:51:24
[INFO] [stdout]    |
[INFO] [stdout] 51 |         while let Some(mut cur_node) = head.as_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/leetcode/reverse_linked_list.rs:73:26
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub fn reverse_list5(mut head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |                          ----^^^^
[INFO] [stdout]    |                          |
[INFO] [stdout]    |                          help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `res` is never read
[INFO] [stdout]   --> src/leetcode/merge_two_sorted_lists.rs:79:17
[INFO] [stdout]    |
[INFO] [stdout] 79 |         let mut res = None;
[INFO] [stdout]    |                 ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/lib.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let mut result = search(&config.query, &content);
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/some_thing/circle_ref_demo.rs:7:10
[INFO] [stdout]   |
[INFO] [stdout] 7 |     Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]   |     ---- ^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 7 -     Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout] 7 +     Cons((), RefCell<Rc<List>>),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `age` is never read
[INFO] [stdout]   --> src/some_thing/close2_demo.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Person {
[INFO] [stdout]    |        ------ field in this struct
[INFO] [stdout] 21 |     name : String,
[INFO] [stdout] 22 |     age : i32
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Person` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `age` is never used
[INFO] [stdout]   --> src/some_thing/close2_demo.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl Person {
[INFO] [stdout]    | ----------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 31 |     pub fn age(&self) -> i32 {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `age` is never read
[INFO] [stdout]   --> src/some_thing/close3_demo.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | struct Person {
[INFO] [stdout]    |        ------ field in this struct
[INFO] [stdout] 22 |     name: String,
[INFO] [stdout] 23 |     age: i32,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Person` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `name` is never used
[INFO] [stdout]   --> src/some_thing/close3_demo.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl Person {
[INFO] [stdout]    | ----------- method in this implementation
[INFO] [stdout] 27 |     pub fn name(&self) -> &String {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value` and `children` are never read
[INFO] [stdout]  --> src/some_thing/tree_demo.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Node {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 6 |     value: i32,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 7 |     parent: RefCell<Weak<Node>>,
[INFO] [stdout] 8 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Draw` is never used
[INFO] [stdout]  --> src/some_thing/trait2_demo.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait Draw {
[INFO] [stdout]   |           ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Screen` is never constructed
[INFO] [stdout]  --> src/some_thing/trait2_demo.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Screen {
[INFO] [stdout]   |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `run` is never used
[INFO] [stdout]   --> src/some_thing/trait2_demo.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout]  9 | impl Screen {
[INFO] [stdout]    | ----------- method in this implementation
[INFO] [stdout] 10 |     pub fn run(&self) {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Button` is never constructed
[INFO] [stdout]   --> src/some_thing/trait2_demo.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct Button {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SelectBox` is never constructed
[INFO] [stdout]   --> src/some_thing/trait2_demo.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | struct SelectBox {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test` is never used
[INFO] [stdout]   --> src/some_thing/trait2_demo.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn test() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `State` is never used
[INFO] [stdout]  --> src/some_thing/state_demo.rs:1:7
[INFO] [stdout]   |
[INFO] [stdout] 1 | trait State {
[INFO] [stdout]   |       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Post` is never constructed
[INFO] [stdout]  --> src/some_thing/state_demo.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub struct Post {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add_text`, `content`, `request_review`, and `approve` are never used
[INFO] [stdout]   --> src/some_thing/state_demo.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl Post {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 15 |     pub fn new() -> Post {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub fn add_text(&mut self, text: &str) {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 26 |     pub fn content(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |     pub fn request_review(&mut self) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn approve(&mut self) {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Draft` is never constructed
[INFO] [stdout]   --> src/some_thing/state_demo.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | struct Draft {}
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PendingReview` is never constructed
[INFO] [stdout]   --> src/some_thing/state_demo.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | struct PendingReview {}
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Published` is never constructed
[INFO] [stdout]   --> src/some_thing/state_demo.rs:67:8
[INFO] [stdout]    |
[INFO] [stdout] 67 | struct Published {}
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test` is never used
[INFO] [stdout]   --> src/some_thing/state_demo.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn test() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SelfReferential` is never constructed
[INFO] [stdout]  --> src/some_thing/pin_test/pin4_demo.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct SelfReferential {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `init_pointer`, and `get_value` are never used
[INFO] [stdout]   --> src/some_thing/pin_test/pin4_demo.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl SelfReferential {
[INFO] [stdout]    | -------------------- associated items in this implementation
[INFO] [stdout] 12 |     fn new(val: String) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 20 |     fn init_pointer(self: Pin<&mut Self>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 25 |     fn get_value<'a>(self: Pin<&'a Self>) -> &'a String {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/some_thing/pin_test/pin4_demo.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task_one` is never used
[INFO] [stdout]  --> src/some_thing/select_test/select1.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 | async fn task_one() { /* ... */ }
[INFO] [stdout]   |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task_two` is never used
[INFO] [stdout]  --> src/some_thing/select_test/select1.rs:9:10
[INFO] [stdout]   |
[INFO] [stdout] 9 | async fn task_two() { /* ... */ }
[INFO] [stdout]   |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `race_tasks` is never used
[INFO] [stdout]   --> src/some_thing/select_test/select1.rs:11:10
[INFO] [stdout]    |
[INFO] [stdout] 11 | async fn race_tasks() {
[INFO] [stdout]    |          ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `input` is never used
[INFO] [stdout]  --> src/io_demo/io.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn input() {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/generics/generics1.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/traits/traits1.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `version_number` is never read
[INFO] [stdout]   --> src/exercise/traits/traits3.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 19 | struct SomeSoftware {
[INFO] [stdout]    |        ------------ field in this struct
[INFO] [stdout] 20 |     version_number: i32,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `version_number` is never read
[INFO] [stdout]   --> src/exercise/traits/traits3.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct OtherSoftware {
[INFO] [stdout]    |        ------------- field in this struct
[INFO] [stdout] 24 |     version_number: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `SomeTrait` is never used
[INFO] [stdout]   --> src/exercise/traits/traits5.rs:12:11
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub trait SomeTrait {
[INFO] [stdout]    |           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `OtherTrait` is never used
[INFO] [stdout]   --> src/exercise/traits/traits5.rs:18:11
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub trait OtherTrait {
[INFO] [stdout]    |           ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SomeStruct` is never constructed
[INFO] [stdout]   --> src/exercise/traits/traits5.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | struct SomeStruct {}
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `OtherStruct` is never constructed
[INFO] [stdout]   --> src/exercise/traits/traits5.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | struct OtherStruct {}
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_func` is never used
[INFO] [stdout]   --> src/exercise/traits/traits5.rs:33:4
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn some_func(item: impl SomeTrait + OtherTrait) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/traits/traits5.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/smart_pointers/box1.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/exercise/smart_pointers/rc1.rs:22:13
[INFO] [stdout]    |
[INFO] [stdout] 22 |     Mercury(Rc<Sun>),
[INFO] [stdout]    |     ------- ^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Planet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 22 -     Mercury(Rc<Sun>),
[INFO] [stdout] 22 +     Mercury(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/exercise/smart_pointers/rc1.rs:23:11
[INFO] [stdout]    |
[INFO] [stdout] 23 |     Venus(Rc<Sun>),
[INFO] [stdout]    |     ----- ^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Planet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 23 -     Venus(Rc<Sun>),
[INFO] [stdout] 23 +     Venus(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/exercise/smart_pointers/rc1.rs:24:11
[INFO] [stdout]    |
[INFO] [stdout] 24 |     Earth(Rc<Sun>),
[INFO] [stdout]    |     ----- ^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Planet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 24 -     Earth(Rc<Sun>),
[INFO] [stdout] 24 +     Earth(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/exercise/smart_pointers/rc1.rs:25:10
[INFO] [stdout]    |
[INFO] [stdout] 25 |     Mars(Rc<Sun>),
[INFO] [stdout]    |     ---- ^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Planet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 25 -     Mars(Rc<Sun>),
[INFO] [stdout] 25 +     Mars(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/exercise/smart_pointers/rc1.rs:26:13
[INFO] [stdout]    |
[INFO] [stdout] 26 |     Jupiter(Rc<Sun>),
[INFO] [stdout]    |     ------- ^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Planet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 26 -     Jupiter(Rc<Sun>),
[INFO] [stdout] 26 +     Jupiter(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/exercise/smart_pointers/rc1.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 |     Saturn(Rc<Sun>),
[INFO] [stdout]    |     ------ ^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Planet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 27 -     Saturn(Rc<Sun>),
[INFO] [stdout] 27 +     Saturn(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/exercise/smart_pointers/rc1.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 |     Uranus(Rc<Sun>),
[INFO] [stdout]    |     ------ ^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Planet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 28 -     Uranus(Rc<Sun>),
[INFO] [stdout] 28 +     Uranus(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/exercise/smart_pointers/rc1.rs:29:13
[INFO] [stdout]    |
[INFO] [stdout] 29 |     Neptune(Rc<Sun>),
[INFO] [stdout]    |     ------- ^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Planet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 29 -     Neptune(Rc<Sun>),
[INFO] [stdout] 29 +     Neptune(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `send_tx` is never used
[INFO] [stdout]   --> src/exercise/threads/threads3.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn send_tx(q: Queue, tx: Arc<mpsc::Sender<u32>>) -> () {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/macros/macros2.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/conversions/from_into.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/conversions/from_str.rs:77:4
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/conversions/try_from_into.rs:98:4
[INFO] [stdout]    |
[INFO] [stdout] 98 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/conversions/using_as.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/exercise/strings/strings1.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `current_favorite_color` is never used
[INFO] [stdout]   --> src/exercise/strings/strings1.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn current_favorite_color() -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/exercise/strings/strings2.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_a_color_word` is never used
[INFO] [stdout]   --> src/exercise/strings/strings2.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn is_a_color_word(attempt: &str) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string_slice` is never used
[INFO] [stdout]   --> src/exercise/strings/strings4.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn string_slice(arg: &str) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string` is never used
[INFO] [stdout]   --> src/exercise/strings/strings4.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn string(arg: String) {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/strings/strings4.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]  --> src/exercise/enums/enums1.rs:8:6
[INFO] [stdout]   |
[INFO] [stdout] 8 | enum Message {
[INFO] [stdout]   |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/enums/enums1.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]  --> src/exercise/enums/enums2.rs:8:6
[INFO] [stdout]   |
[INFO] [stdout] 8 | enum Message {
[INFO] [stdout]   |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `call` is never used
[INFO] [stdout]   --> src/exercise/enums/enums2.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl Message {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] 17 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/exercise/enums/enums2.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/exercise/move/move_semantics6.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_char` is never used
[INFO] [stdout]   --> src/exercise/move/move_semantics6.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn get_char(data: &String) -> char {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string_uppercase` is never used
[INFO] [stdout]   --> src/exercise/move/move_semantics6.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn string_uppercase(mut data: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `BASE` is never used
[INFO] [stdout]   --> src/leetcode/group_anagrams.rs:32:7
[INFO] [stdout]    |
[INFO] [stdout] 32 | const BASE : i32 = 97;
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `encode` is never used
[INFO] [stdout]   --> src/leetcode/group_anagrams.rs:73:12
[INFO] [stdout]    |
[INFO] [stdout] 34 | impl Solution {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 73 |     pub fn encode(str: &str) -> String {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]   --> src/leetcode/longest_consecutive_sequence.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct Solution {}
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `longest_consecutive` is never used
[INFO] [stdout]   --> src/leetcode/longest_consecutive_sequence.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | impl Solution {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 30 |     pub fn longest_consecutive(nums: Vec<i32>) -> i32 {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test` is never used
[INFO] [stdout]   --> src/leetcode/longest_consecutive_sequence.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub fn test() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/leetcode/reverse_linked_list.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout]  9 | impl ListNode {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 10 |     #[inline]
[INFO] [stdout] 11 |     fn new(val: i32) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `reverse_list`, `reverse_list2`, and `reverse_list3` are never used
[INFO] [stdout]   --> src/leetcode/reverse_linked_list.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 21 | impl Solution {
[INFO] [stdout]    | ------------- associated functions in this implementation
[INFO] [stdout] 22 |     pub fn reverse_list(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn reverse_list2(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 48 |     pub fn reverse_list3(mut head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ListNode` is never constructed
[INFO] [stdout]  --> src/leetcode/merge_two_sorted_lists.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub struct ListNode {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/leetcode/merge_two_sorted_lists.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl ListNode {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 11 |     #[inline]
[INFO] [stdout] 12 |     fn new(val: i32) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]   --> src/leetcode/merge_two_sorted_lists.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub struct Solution {}
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `merge_two_lists`, `merge_two_lists2`, and `merge_two_lists3` are never used
[INFO] [stdout]   --> src/leetcode/merge_two_sorted_lists.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl Solution {
[INFO] [stdout]    | ------------- associated functions in this implementation
[INFO] [stdout] 23 |     pub fn merge_two_lists(list1: Option<Box<ListNode>>, list2: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 52 |     pub fn merge_two_lists2(list1: Option<Box<ListNode>>, list2: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 72 |     pub fn merge_two_lists3(list1: Option<Box<ListNode>>, list2: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/leetcode/lru2.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Node {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/leetcode/lru2.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Node {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] 13 |     fn new(key: i32, value: i32) -> Rc<RefCell<Self>> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LRUCache` is never constructed
[INFO] [stdout]   --> src/leetcode/lru2.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | struct LRUCache {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `get`, `put`, `remove`, and `push_front` are never used
[INFO] [stdout]   --> src/leetcode/lru2.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl LRUCache {
[INFO] [stdout]    | ------------- associated items in this implementation
[INFO] [stdout] 25 |     pub fn new(capacity: i32) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 32 |     pub fn get(&mut self, key: i32) -> i32 {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 43 |     pub fn put(&mut self, key: i32, value: i32) {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 62 |     fn remove(&mut self, x: Rc<RefCell<Node>>) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 70 |     fn push_front(&mut self, x: Rc<RefCell<Node>>) {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `async_main` is never used
[INFO] [stdout]   --> src/async_demo/ayn_demo.rs:34:10
[INFO] [stdout]    |
[INFO] [stdout] 34 | async fn async_main() {
[INFO] [stdout]    |          ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/some_thing/thread_demo.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     handle1.join();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let _ = handle1.join();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/some_thing/thread_demo.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     handle2.join();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let _ = handle2.join();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]   --> src/exercise/option/options1.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 |     if time_of_day < 0 || time_of_day > 23 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: path statement with no effect
[INFO] [stdout]   --> src/exercise/option/options3.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 |     y; // Fix without deleting this line.
[INFO] [stdout]    |     ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(path_statements)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 3.02s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: demo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 4`
[INFO] running `Command { std: "docker" "inspect" "09304600d0ef52e4932ddb269d08e3d0fe53243be3081e065adbfaf654afe8ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "09304600d0ef52e4932ddb269d08e3d0fe53243be3081e065adbfaf654afe8ee", kill_on_drop: false }`
[INFO] [stdout] 09304600d0ef52e4932ddb269d08e3d0fe53243be3081e065adbfaf654afe8ee
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 44d6f9263efd96914cef26b21d704eaa8eb51f8b1a80db7441d56673397339a8
[INFO] running `Command { std: "docker" "start" "-a" "44d6f9263efd96914cef26b21d704eaa8eb51f8b1a80db7441d56673397339a8", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `std::any::Any`
[INFO] [stderr]  --> src/lib.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::any::Any;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::HashMap`
[INFO] [stderr]  --> src/some_thing/hash_demo.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::collections::HashMap;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fmt::Debug`
[INFO] [stderr]  --> src/some_thing/thread_demo.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::fmt::Debug;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Arc`, `Mutex`, and `mpsc`
[INFO] [stderr]  --> src/some_thing/thread_demo.rs:2:17
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::sync::{Arc, mpsc, Mutex};
[INFO] [stderr]   |                 ^^^  ^^^^  ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::thread`
[INFO] [stderr]  --> src/some_thing/thread_demo.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::thread;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::time::Duration`
[INFO] [stderr]  --> src/some_thing/thread_demo.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::time::Duration;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::sync::mpsc`
[INFO] [stderr]  --> src/some_thing/pin_test/pin3_demo.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::sync::mpsc;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Duration` and `self`
[INFO] [stderr]  --> src/some_thing/select_test/select1.rs:6:26
[INFO] [stderr]   |
[INFO] [stderr] 6 | use tokio::{self, time::{self, Duration}};
[INFO] [stderr]   |                          ^^^^  ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `tokio::join`
[INFO] [stderr]   --> src/some_thing/async_test.rs:2:5
[INFO] [stderr]    |
[INFO] [stderr]  2 | use tokio::join;
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] help: if this is a test module, consider adding a `#[cfg(test)]` to the containing module
[INFO] [stderr]   --> src/some_thing.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | mod async_test;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::error::Error`
[INFO] [stderr]   --> src/exercise/iterators/iterators3.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 | use std::error::Error;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::sync::Arc`
[INFO] [stderr]   --> src/exercise/smart_pointers/arc1.rs:27:5
[INFO] [stderr]    |
[INFO] [stderr] 27 | use std::sync::Arc;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: the lint level is defined here
[INFO] [stderr]   --> src/exercise/smart_pointers/arc1.rs:26:11
[INFO] [stderr]    |
[INFO] [stderr] 26 | #![forbid(unused_imports)]
[INFO] [stderr]    |           ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::thread`
[INFO] [stderr]   --> src/exercise/smart_pointers/arc1.rs:28:5
[INFO] [stderr]    |
[INFO] [stderr] 28 | use std::thread;
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::thread`
[INFO] [stderr]   --> src/exercise/threads/threads1.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 | use std::thread;
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Duration` and `Instant`
[INFO] [stderr]   --> src/exercise/threads/threads1.rs:14:17
[INFO] [stderr]    |
[INFO] [stderr] 14 | use std::time::{Duration, Instant};
[INFO] [stderr]    |                 ^^^^^^^^  ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Arc` and `Mutex`
[INFO] [stderr]   --> src/exercise/threads/threads2.rs:12:17
[INFO] [stderr]    |
[INFO] [stderr] 12 | use std::sync::{Arc, Mutex};
[INFO] [stderr]    |                 ^^^  ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::thread`
[INFO] [stderr]   --> src/exercise/threads/threads2.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 | use std::thread;
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::time::Duration`
[INFO] [stderr]   --> src/exercise/threads/threads2.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 | use std::time::Duration;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition: `my_macro`
[INFO] [stderr]  --> src/exercise/macros/macros1.rs:8:14
[INFO] [stderr]   |
[INFO] [stderr] 8 | macro_rules! my_macro {
[INFO] [stderr]   |              ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_macros)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::my_macro`
[INFO] [stderr]   --> src/exercise/macros/macros3.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use crate::my_macro;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition: `my_macro`
[INFO] [stderr]  --> src/exercise/macros/macros4.rs:9:14
[INFO] [stderr]   |
[INFO] [stderr] 9 | macro_rules! my_macro {
[INFO] [stderr]   |              ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::future::Future`
[INFO] [stderr]  --> src/async_demo/ayn_demo.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::future::Future;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]  --> src/async_demo/ayn_demo.rs:8:14
[INFO] [stderr]   |
[INFO] [stderr] 8 |     for i in (0..4) {
[INFO] [stderr]   |              ^    ^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]   |
[INFO] [stderr] 8 -     for i in (0..4) {
[INFO] [stderr] 8 +     for i in 0..4 {
[INFO] [stderr]   |
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]   --> src/async_demo/ayn_demo.rs:16:14
[INFO] [stderr]    |
[INFO] [stderr] 16 |     for i in (0..4) {
[INFO] [stderr]    |              ^    ^
[INFO] [stderr]    |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 16 -     for i in (0..4) {
[INFO] [stderr] 16 +     for i in 0..4 {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stderr]   --> src/async_demo/ayn_demo.rs:23:14
[INFO] [stderr]    |
[INFO] [stderr] 23 |     for i in (0..4) {
[INFO] [stderr]    |              ^    ^
[INFO] [stderr]    |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr] 23 -     for i in (0..4) {
[INFO] [stderr] 23 +     for i in 0..4 {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `time::Duration`
[INFO] [stderr]  --> src/async_demo/excutor.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 |     time::Duration,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::async_demo::waker_test::TimerFuture`
[INFO] [stderr]   --> src/async_demo/excutor.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 | use crate::async_demo::waker_test::TimerFuture;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]  --> src/async_demo/ayn_demo.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     for i in (0..4) {
[INFO] [stderr]   |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `song`
[INFO] [stderr]   --> src/async_demo/ayn_demo.rs:15:20
[INFO] [stderr]    |
[INFO] [stderr] 15 | async fn sing_song(song: Song) {
[INFO] [stderr]    |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_song`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/async_demo/ayn_demo.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |     for i in (0..4) {
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/async_demo/ayn_demo.rs:23:9
[INFO] [stderr]    |
[INFO] [stderr] 23 |     for i in (0..4) {
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `post`
[INFO] [stderr]  --> src/some_thing/state_demo.rs:4:27
[INFO] [stderr]   |
[INFO] [stderr] 4 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stderr]   |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/exercise/move/move_semantics1.rs:16:13
[INFO] [stderr]    |
[INFO] [stderr] 16 | fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
[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/leetcode/reverse_linked_list.rs:51:24
[INFO] [stderr]    |
[INFO] [stderr] 51 |         while let Some(mut cur_node) = head.as_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/leetcode/reverse_linked_list.rs:73:26
[INFO] [stderr]    |
[INFO] [stderr] 73 |     pub fn reverse_list5(mut head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stderr]    |                          ----^^^^
[INFO] [stderr]    |                          |
[INFO] [stderr]    |                          help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `res` is never read
[INFO] [stderr]   --> src/leetcode/merge_two_sorted_lists.rs:79:17
[INFO] [stderr]    |
[INFO] [stderr] 79 |         let mut res = None;
[INFO] [stderr]    |                 ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 |     let mut result = search(&config.query, &content);
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: enum `List` is never used
[INFO] [stderr]  --> src/some_thing/circle_ref_demo.rs:6:6
[INFO] [stderr]   |
[INFO] [stderr] 6 | enum List {
[INFO] [stderr]   |      ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method `tail` is never used
[INFO] [stderr]   --> src/some_thing/circle_ref_demo.rs:12:8
[INFO] [stderr]    |
[INFO] [stderr] 11 | impl List {
[INFO] [stderr]    | --------- method in this implementation
[INFO] [stderr] 12 |     fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `list_to_map` is never used
[INFO] [stderr]  --> src/some_thing/close_demo.rs:4:4
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn list_to_map<K, V, T, M, N>(vec:Vec<T>, m:M, n:N) -> HashMap<K, V>
[INFO] [stderr]   |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Person` is never constructed
[INFO] [stderr]   --> src/some_thing/close_demo.rs:19:8
[INFO] [stderr]    |
[INFO] [stderr] 19 | struct Person {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: methods `name` and `age` are never used
[INFO] [stderr]   --> src/some_thing/close_demo.rs:26:12
[INFO] [stderr]    |
[INFO] [stderr] 25 | impl Person {
[INFO] [stderr]    | ----------- methods in this implementation
[INFO] [stderr] 26 |     pub fn name(&self) -> &String {
[INFO] [stderr]    |            ^^^^
[INFO] [stderr] ...
[INFO] [stderr] 30 |     pub fn age(&self) -> i32 {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `list_to_map` is never used
[INFO] [stderr]  --> src/some_thing/close2_demo.rs:4:4
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn list_to_map<K, T, M, N>(vec: Vec<T>, m: M, n: N) -> HashMap<K, T>
[INFO] [stderr]   |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Person` is never constructed
[INFO] [stderr]   --> src/some_thing/close2_demo.rs:20:8
[INFO] [stderr]    |
[INFO] [stderr] 20 | struct Person {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: methods `name` and `age` are never used
[INFO] [stderr]   --> src/some_thing/close2_demo.rs:27:12
[INFO] [stderr]    |
[INFO] [stderr] 26 | impl Person {
[INFO] [stderr]    | ----------- methods in this implementation
[INFO] [stderr] 27 |     pub fn name(&self) -> &String {
[INFO] [stderr]    |            ^^^^
[INFO] [stderr] ...
[INFO] [stderr] 31 |     pub fn age(&self) -> i32 {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `list_to_map` is never used
[INFO] [stderr]  --> src/some_thing/close3_demo.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn list_to_map<K, V, T, M, N>(vec: Vec<&T>, m: M, n: N) -> HashMap<K, &V>
[INFO] [stderr]   |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Person` is never constructed
[INFO] [stderr]   --> src/some_thing/close3_demo.rs:21:8
[INFO] [stderr]    |
[INFO] [stderr] 21 | struct Person {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: methods `name` and `self_ref` are never used
[INFO] [stderr]   --> src/some_thing/close3_demo.rs:27:12
[INFO] [stderr]    |
[INFO] [stderr] 26 | impl Person {
[INFO] [stderr]    | ----------- methods in this implementation
[INFO] [stderr] 27 |     pub fn name(&self) -> &String {
[INFO] [stderr]    |            ^^^^
[INFO] [stderr] ...
[INFO] [stderr] 32 |     pub fn self_ref(&self) -> &Self {
[INFO] [stderr]    |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Node` is never constructed
[INFO] [stderr]  --> src/some_thing/tree_demo.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | struct Node {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `Draw` is never used
[INFO] [stderr]  --> src/some_thing/trait2_demo.rs:1:11
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub trait Draw {
[INFO] [stderr]   |           ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Screen` is never constructed
[INFO] [stderr]  --> src/some_thing/trait2_demo.rs:5:12
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub struct Screen {
[INFO] [stderr]   |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `run` is never used
[INFO] [stderr]   --> src/some_thing/trait2_demo.rs:10:12
[INFO] [stderr]    |
[INFO] [stderr]  9 | impl Screen {
[INFO] [stderr]    | ----------- method in this implementation
[INFO] [stderr] 10 |     pub fn run(&self) {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Button` is never constructed
[INFO] [stderr]   --> src/some_thing/trait2_demo.rs:17:12
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub struct Button {
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `SelectBox` is never constructed
[INFO] [stderr]   --> src/some_thing/trait2_demo.rs:29:8
[INFO] [stderr]    |
[INFO] [stderr] 29 | struct SelectBox {
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `test` is never used
[INFO] [stderr]   --> src/some_thing/trait2_demo.rs:41:4
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn test() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `State` is never used
[INFO] [stderr]  --> src/some_thing/state_demo.rs:1:7
[INFO] [stderr]   |
[INFO] [stderr] 1 | trait State {
[INFO] [stderr]   |       ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Post` is never constructed
[INFO] [stderr]  --> src/some_thing/state_demo.rs:9:12
[INFO] [stderr]   |
[INFO] [stderr] 9 | pub struct Post {
[INFO] [stderr]   |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new`, `add_text`, `content`, `request_review`, and `approve` are never used
[INFO] [stderr]   --> src/some_thing/state_demo.rs:15:12
[INFO] [stderr]    |
[INFO] [stderr] 14 | impl Post {
[INFO] [stderr]    | --------- associated items in this implementation
[INFO] [stderr] 15 |     pub fn new() -> Post {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] ...
[INFO] [stderr] 22 |     pub fn add_text(&mut self, text: &str) {
[INFO] [stderr]    |            ^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 26 |     pub fn content(&self) -> &str {
[INFO] [stderr]    |            ^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 30 |     pub fn request_review(&mut self) {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 36 |     pub fn approve(&mut self) {
[INFO] [stderr]    |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Draft` is never constructed
[INFO] [stderr]   --> src/some_thing/state_demo.rs:44:8
[INFO] [stderr]    |
[INFO] [stderr] 44 | struct Draft {}
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `PendingReview` is never constructed
[INFO] [stderr]   --> src/some_thing/state_demo.rs:55:8
[INFO] [stderr]    |
[INFO] [stderr] 55 | struct PendingReview {}
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Published` is never constructed
[INFO] [stderr]   --> src/some_thing/state_demo.rs:67:8
[INFO] [stderr]    |
[INFO] [stderr] 67 | struct Published {}
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `test` is never used
[INFO] [stderr]   --> src/some_thing/state_demo.rs:81:4
[INFO] [stderr]    |
[INFO] [stderr] 81 | fn test() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `split_at_mut` is never used
[INFO] [stderr]   --> src/some_thing/unsafe_demo.rs:36:4
[INFO] [stderr]    |
[INFO] [stderr] 36 | fn split_at_mut(values: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Test` is never constructed
[INFO] [stderr]  --> src/some_thing/pin_test/pin1_demo.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | struct Test {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new`, `init`, `a`, and `b` are never used
[INFO] [stderr]   --> src/some_thing/pin_test/pin1_demo.rs:10:8
[INFO] [stderr]    |
[INFO] [stderr]  9 | impl Test {
[INFO] [stderr]    | --------- associated items in this implementation
[INFO] [stderr] 10 |     fn new(txt: &str) -> Self {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] ...
[INFO] [stderr] 17 |     fn init(&mut self) {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] ...
[INFO] [stderr] 22 |     fn a(&self) -> &str {
[INFO] [stderr]    |        ^
[INFO] [stderr] ...
[INFO] [stderr] 26 |     fn b(&self) -> &String {
[INFO] [stderr]    |        ^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Test` is never constructed
[INFO] [stderr]  --> src/some_thing/pin_test/pin2_demo.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | struct Test {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new`, `init`, `a`, and `b` are never used
[INFO] [stderr]   --> src/some_thing/pin_test/pin2_demo.rs:13:8
[INFO] [stderr]    |
[INFO] [stderr] 12 | impl Test {
[INFO] [stderr]    | --------- associated items in this implementation
[INFO] [stderr] 13 |     fn new(txt: &str) -> Self {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] ...
[INFO] [stderr] 21 |     fn init(self: Pin<&mut Self>) {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] ...
[INFO] [stderr] 27 |     fn a(self: Pin<&Self>) -> &str {
[INFO] [stderr]    |        ^
[INFO] [stderr] ...
[INFO] [stderr] 31 |     fn b(self: Pin<&Self>) -> &String {
[INFO] [stderr]    |        ^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Test` is never constructed
[INFO] [stderr]  --> src/some_thing/pin_test/pin3_demo.rs:7:8
[INFO] [stderr]   |
[INFO] [stderr] 7 | struct Test {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new`, `a`, and `b` are never used
[INFO] [stderr]   --> src/some_thing/pin_test/pin3_demo.rs:14:8
[INFO] [stderr]    |
[INFO] [stderr] 13 | impl Test {
[INFO] [stderr]    | --------- associated items in this implementation
[INFO] [stderr] 14 |     fn new(txt: &str) -> Pin<Box<Self>> {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] ...
[INFO] [stderr] 27 |     fn a(self: Pin<&Self>) -> &str {
[INFO] [stderr]    |        ^
[INFO] [stderr] ...
[INFO] [stderr] 31 |     fn b(self: Pin<&Self>) -> &String {
[INFO] [stderr]    |        ^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `SelfReferential` is never constructed
[INFO] [stderr]  --> src/some_thing/pin_test/pin4_demo.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | struct SelfReferential {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new`, `init_pointer`, and `get_value` are never used
[INFO] [stderr]   --> src/some_thing/pin_test/pin4_demo.rs:12:8
[INFO] [stderr]    |
[INFO] [stderr] 11 | impl SelfReferential {
[INFO] [stderr]    | -------------------- associated items in this implementation
[INFO] [stderr] 12 |     fn new(val: String) -> Self {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] ...
[INFO] [stderr] 20 |     fn init_pointer(self: Pin<&mut Self>) {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 25 |     fn get_value<'a>(self: Pin<&'a Self>) -> &'a String {
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]   --> src/some_thing/pin_test/pin4_demo.rs:30:4
[INFO] [stderr]    |
[INFO] [stderr] 30 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `task_one` is never used
[INFO] [stderr]  --> src/some_thing/select_test/select1.rs:8:10
[INFO] [stderr]   |
[INFO] [stderr] 8 | async fn task_one() { /* ... */ }
[INFO] [stderr]   |          ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `task_two` is never used
[INFO] [stderr]  --> src/some_thing/select_test/select1.rs:9:10
[INFO] [stderr]   |
[INFO] [stderr] 9 | async fn task_two() { /* ... */ }
[INFO] [stderr]   |          ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `race_tasks` is never used
[INFO] [stderr]   --> src/some_thing/select_test/select1.rs:11:10
[INFO] [stderr]    |
[INFO] [stderr] 11 | async fn race_tasks() {
[INFO] [stderr]    |          ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `task_one` is never used
[INFO] [stderr]  --> src/some_thing/async_test.rs:4:10
[INFO] [stderr]   |
[INFO] [stderr] 4 | async fn task_one() {
[INFO] [stderr]   |          ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `task_two` is never used
[INFO] [stderr]   --> src/some_thing/async_test.rs:10:10
[INFO] [stderr]    |
[INFO] [stderr] 10 | async fn task_two() {
[INFO] [stderr]    |          ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `input` is never used
[INFO] [stderr]  --> src/io_demo/io.rs:3:8
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub fn input() {
[INFO] [stderr]   |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Team` is never constructed
[INFO] [stderr]   --> src/exercise/hashmap/hashmap3.rs:23:8
[INFO] [stderr]    |
[INFO] [stderr] 23 | struct Team {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `build_scores_table` is never used
[INFO] [stderr]   --> src/exercise/hashmap/hashmap3.rs:28:4
[INFO] [stderr]    |
[INFO] [stderr] 28 | fn build_scores_table(results: String) -> HashMap<String, Team> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `maybe_icecream` is never used
[INFO] [stderr]   --> src/exercise/option/options1.rs:11:4
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn maybe_icecream(time_of_day: u16) -> Option<u16> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Point` is never constructed
[INFO] [stderr]  --> src/exercise/option/options3.rs:8:8
[INFO] [stderr]   |
[INFO] [stderr] 8 | struct Point {
[INFO] [stderr]   |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `generate_nametag_text` is never used
[INFO] [stderr]   --> src/exercise/error/errors1.rs:14:8
[INFO] [stderr]    |
[INFO] [stderr] 14 | pub fn generate_nametag_text(name: String) -> Result<String, String> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `total_cost` is never used
[INFO] [stderr]   --> src/exercise/error/errors2.rs:26:8
[INFO] [stderr]    |
[INFO] [stderr] 26 | pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `total_cost` is never used
[INFO] [stderr]   --> src/exercise/error/errors3.rs:29:8
[INFO] [stderr]    |
[INFO] [stderr] 29 | pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `PositiveNonzeroInteger` is never constructed
[INFO] [stderr]  --> src/exercise/error/errors4.rs:9:8
[INFO] [stderr]   |
[INFO] [stderr] 9 | struct PositiveNonzeroInteger(u64);
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `CreationError` is never used
[INFO] [stderr]   --> src/exercise/error/errors4.rs:12:6
[INFO] [stderr]    |
[INFO] [stderr] 12 | enum CreationError {
[INFO] [stderr]    |      ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `new` is never used
[INFO] [stderr]   --> src/exercise/error/errors4.rs:18:8
[INFO] [stderr]    |
[INFO] [stderr] 17 | impl PositiveNonzeroInteger {
[INFO] [stderr]    | --------------------------- associated function in this implementation
[INFO] [stderr] 18 |     fn new(value: i64) -> Result<PositiveNonzeroInteger, CreationError> {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `method` is never used
[INFO] [stderr]   --> src/exercise/error/errors5.rs:37:4
[INFO] [stderr]    |
[INFO] [stderr] 37 | fn method() -> Result<(), Box<dyn Error>> {
[INFO] [stderr]    |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `PositiveNonzeroInteger` is never constructed
[INFO] [stderr]   --> src/exercise/error/errors5.rs:47:8
[INFO] [stderr]    |
[INFO] [stderr] 47 | struct PositiveNonzeroInteger(u64);
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `CreationError` is never used
[INFO] [stderr]   --> src/exercise/error/errors5.rs:50:6
[INFO] [stderr]    |
[INFO] [stderr] 50 | enum CreationError {
[INFO] [stderr]    |      ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `new` is never used
[INFO] [stderr]   --> src/exercise/error/errors5.rs:56:8
[INFO] [stderr]    |
[INFO] [stderr] 55 | impl PositiveNonzeroInteger {
[INFO] [stderr]    | --------------------------- associated function in this implementation
[INFO] [stderr] 56 |     fn new(value: i64) -> Result<PositiveNonzeroInteger, CreationError> {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `ParsePosNonzeroError` is never used
[INFO] [stderr]   --> src/exercise/error/errors6.rs:18:6
[INFO] [stderr]    |
[INFO] [stderr] 18 | enum ParsePosNonzeroError {
[INFO] [stderr]    |      ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated functions `from_creation` and `from_parseint` are never used
[INFO] [stderr]   --> src/exercise/error/errors6.rs:24:8
[INFO] [stderr]    |
[INFO] [stderr] 23 | impl ParsePosNonzeroError {
[INFO] [stderr]    | ------------------------- associated functions in this implementation
[INFO] [stderr] 24 |     fn from_creation(err: CreationError) -> ParsePosNonzeroError {
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 29 |     fn from_parseint(err: ParseIntError) -> ParsePosNonzeroError {
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `parse_pos_nonzero` is never used
[INFO] [stderr]   --> src/exercise/error/errors6.rs:34:4
[INFO] [stderr]    |
[INFO] [stderr] 34 | fn parse_pos_nonzero(s: &str) -> Result<PositiveNonzeroInteger, ParsePosNonzeroError> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `PositiveNonzeroInteger` is never constructed
[INFO] [stderr]   --> src/exercise/error/errors6.rs:51:8
[INFO] [stderr]    |
[INFO] [stderr] 51 | struct PositiveNonzeroInteger(u64);
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `CreationError` is never used
[INFO] [stderr]   --> src/exercise/error/errors6.rs:54:6
[INFO] [stderr]    |
[INFO] [stderr] 54 | enum CreationError {
[INFO] [stderr]    |      ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `new` is never used
[INFO] [stderr]   --> src/exercise/error/errors6.rs:60:8
[INFO] [stderr]    |
[INFO] [stderr] 59 | impl PositiveNonzeroInteger {
[INFO] [stderr]    | --------------------------- associated function in this implementation
[INFO] [stderr] 60 |     fn new(value: i64) -> Result<PositiveNonzeroInteger, CreationError> {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]   --> src/exercise/generics/generics1.rs:11:4
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Wrapper` is never constructed
[INFO] [stderr]   --> src/exercise/generics/generics2.rs:11:8
[INFO] [stderr]    |
[INFO] [stderr] 11 | struct Wrapper<T> {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `new` is never used
[INFO] [stderr]   --> src/exercise/generics/generics2.rs:16:12
[INFO] [stderr]    |
[INFO] [stderr] 15 | impl <T> Wrapper<T> {
[INFO] [stderr]    | ------------------- associated function in this implementation
[INFO] [stderr] 16 |     pub fn new(value: T) -> Self {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `AppendBar` is never used
[INFO] [stderr]   --> src/exercise/traits/traits1.rs:12:7
[INFO] [stderr]    |
[INFO] [stderr] 12 | trait AppendBar {
[INFO] [stderr]    |       ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]   --> src/exercise/traits/traits1.rs:23:4
[INFO] [stderr]    |
[INFO] [stderr] 23 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `AppendBar` is never used
[INFO] [stderr]   --> src/exercise/traits/traits2.rs:13:7
[INFO] [stderr]    |
[INFO] [stderr] 13 | trait AppendBar {
[INFO] [stderr]    |       ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `Licensed` is never used
[INFO] [stderr]   --> src/exercise/traits/traits3.rs:13:11
[INFO] [stderr]    |
[INFO] [stderr] 13 | pub trait Licensed {
[INFO] [stderr]    |           ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `SomeSoftware` is never constructed
[INFO] [stderr]   --> src/exercise/traits/traits3.rs:19:8
[INFO] [stderr]    |
[INFO] [stderr] 19 | struct SomeSoftware {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `OtherSoftware` is never constructed
[INFO] [stderr]   --> src/exercise/traits/traits3.rs:23:8
[INFO] [stderr]    |
[INFO] [stderr] 23 | struct OtherSoftware {
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `Licensed` is never used
[INFO] [stderr]   --> src/exercise/traits/traits4.rs:12:11
[INFO] [stderr]    |
[INFO] [stderr] 12 | pub trait Licensed {
[INFO] [stderr]    |           ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `SomeSoftware` is never constructed
[INFO] [stderr]   --> src/exercise/traits/traits4.rs:18:8
[INFO] [stderr]    |
[INFO] [stderr] 18 | struct SomeSoftware {}
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `OtherSoftware` is never constructed
[INFO] [stderr]   --> src/exercise/traits/traits4.rs:20:8
[INFO] [stderr]    |
[INFO] [stderr] 20 | struct OtherSoftware {}
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `compare_license_types` is never used
[INFO] [stderr]   --> src/exercise/traits/traits4.rs:26:4
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn compare_license_types(software: impl Licensed, software_two: impl Licensed) -> bool {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `SomeTrait` is never used
[INFO] [stderr]   --> src/exercise/traits/traits5.rs:12:11
[INFO] [stderr]    |
[INFO] [stderr] 12 | pub trait SomeTrait {
[INFO] [stderr]    |           ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `OtherTrait` is never used
[INFO] [stderr]   --> src/exercise/traits/traits5.rs:18:11
[INFO] [stderr]    |
[INFO] [stderr] 18 | pub trait OtherTrait {
[INFO] [stderr]    |           ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `SomeStruct` is never constructed
[INFO] [stderr]   --> src/exercise/traits/traits5.rs:24:8
[INFO] [stderr]    |
[INFO] [stderr] 24 | struct SomeStruct {}
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `OtherStruct` is never constructed
[INFO] [stderr]   --> src/exercise/traits/traits5.rs:25:8
[INFO] [stderr]    |
[INFO] [stderr] 25 | struct OtherStruct {}
[INFO] [stderr]    |        ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `some_func` is never used
[INFO] [stderr]   --> src/exercise/traits/traits5.rs:33:4
[INFO] [stderr]    |
[INFO] [stderr] 33 | fn some_func(item: impl SomeTrait + OtherTrait) -> bool {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]   --> src/exercise/traits/traits5.rs:37:4
[INFO] [stderr]    |
[INFO] [stderr] 37 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `longest` is never used
[INFO] [stderr]   --> src/exercise/lifetimes/lifetimes1.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `longest` is never used
[INFO] [stderr]   --> src/exercise/lifetimes/lifetimes2.rs:11:4
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn longest(x: String, y: String) -> String {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Book` is never constructed
[INFO] [stderr]   --> src/exercise/lifetimes/lifetimes3.rs:10:8
[INFO] [stderr]    |
[INFO] [stderr] 10 | struct Book<'a> {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `capitalize_first` is never used
[INFO] [stderr]   --> src/exercise/iterators/iterators2.rs:14:8
[INFO] [stderr]    |
[INFO] [stderr] 14 | pub fn capitalize_first(input: &str) -> String {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `capitalize_words_vector` is never used
[INFO] [stderr]   --> src/exercise/iterators/iterators2.rs:27:8
[INFO] [stderr]    |
[INFO] [stderr] 27 | pub fn capitalize_words_vector(words: &[&str]) -> Vec<String> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `capitalize_words_string` is never used
[INFO] [stderr]   --> src/exercise/iterators/iterators2.rs:41:8
[INFO] [stderr]    |
[INFO] [stderr] 41 | pub fn capitalize_words_string(words: &[&str]) -> String {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `DivisionError` is never used
[INFO] [stderr]   --> src/exercise/iterators/iterators3.rs:17:10
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub enum DivisionError {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `NotDivisibleError` is never constructed
[INFO] [stderr]   --> src/exercise/iterators/iterators3.rs:23:12
[INFO] [stderr]    |
[INFO] [stderr] 23 | pub struct NotDivisibleError {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `divide` is never used
[INFO] [stderr]   --> src/exercise/iterators/iterators3.rs:30:8
[INFO] [stderr]    |
[INFO] [stderr] 30 | pub fn divide(a: i32, b: i32) -> Result<i32, DivisionError> {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `result_with_list` is never used
[INFO] [stderr]   --> src/exercise/iterators/iterators3.rs:48:4
[INFO] [stderr]    |
[INFO] [stderr] 48 | fn result_with_list() -> Result<Vec<i32>, ()> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `list_of_results` is never used
[INFO] [stderr]   --> src/exercise/iterators/iterators3.rs:57:4
[INFO] [stderr]    |
[INFO] [stderr] 57 | fn list_of_results() -> Vec<Result<i32, DivisionError>> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `factorial` is never used
[INFO] [stderr]  --> src/exercise/iterators/iterators4.rs:8:8
[INFO] [stderr]   |
[INFO] [stderr] 8 | pub fn factorial(num: u64) -> u64 {
[INFO] [stderr]   |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `Progress` is never used
[INFO] [stderr]   --> src/exercise/iterators/iterators5.rs:19:6
[INFO] [stderr]    |
[INFO] [stderr] 19 | enum Progress {
[INFO] [stderr]    |      ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `count_for` is never used
[INFO] [stderr]   --> src/exercise/iterators/iterators5.rs:25:4
[INFO] [stderr]    |
[INFO] [stderr] 25 | fn count_for(map: &HashMap<String, Progress>, value: Progress) -> usize {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `count_iterator` is never used
[INFO] [stderr]   --> src/exercise/iterators/iterators5.rs:35:4
[INFO] [stderr]    |
[INFO] [stderr] 35 | fn count_iterator(map: &HashMap<String, Progress>, value: Progress) -> usize {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `count_collection_for` is never used
[INFO] [stderr]   --> src/exercise/iterators/iterators5.rs:41:4
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn count_collection_for(collection: &[HashMap<String, Progress>], value: Progress) -> usize {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `count_collection_iterator` is never used
[INFO] [stderr]   --> src/exercise/iterators/iterators5.rs:53:4
[INFO] [stderr]    |
[INFO] [stderr] 53 | fn count_collection_iterator(collection: &[HashMap<String, Progress>], value: Progress) -> usize {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `List` is never used
[INFO] [stderr]   --> src/exercise/smart_pointers/box1.rs:25:10
[INFO] [stderr]    |
[INFO] [stderr] 25 | pub enum List {
[INFO] [stderr]    |          ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]   --> src/exercise/smart_pointers/box1.rs:30:4
[INFO] [stderr]    |
[INFO] [stderr] 30 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `create_empty_list` is never used
[INFO] [stderr]   --> src/exercise/smart_pointers/box1.rs:38:8
[INFO] [stderr]    |
[INFO] [stderr] 38 | pub fn create_empty_list() -> List {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `create_non_empty_list` is never used
[INFO] [stderr]   --> src/exercise/smart_pointers/box1.rs:42:8
[INFO] [stderr]    |
[INFO] [stderr] 42 | pub fn create_non_empty_list() -> List {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `abs_all` is never used
[INFO] [stderr]   --> src/exercise/smart_pointers/cow1.rs:19:4
[INFO] [stderr]    |
[INFO] [stderr] 19 | fn abs_all<'a, 'b>(input: &'a mut Cow<'b, [i32]>) -> &'a mut Cow<'b, [i32]> {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Sun` is never constructed
[INFO] [stderr]   --> src/exercise/smart_pointers/rc1.rs:18:8
[INFO] [stderr]    |
[INFO] [stderr] 18 | struct Sun {}
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `Planet` is never used
[INFO] [stderr]   --> src/exercise/smart_pointers/rc1.rs:21:6
[INFO] [stderr]    |
[INFO] [stderr] 21 | enum Planet {
[INFO] [stderr]    |      ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `details` is never used
[INFO] [stderr]   --> src/exercise/smart_pointers/rc1.rs:33:8
[INFO] [stderr]    |
[INFO] [stderr] 32 | impl Planet {
[INFO] [stderr]    | ----------- method in this implementation
[INFO] [stderr] 33 |     fn details(&self) {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `JobStatus` is never constructed
[INFO] [stderr]   --> src/exercise/threads/threads2.rs:16:8
[INFO] [stderr]    |
[INFO] [stderr] 16 | struct JobStatus {
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Queue` is never constructed
[INFO] [stderr]   --> src/exercise/threads/threads3.rs:13:8
[INFO] [stderr]    |
[INFO] [stderr] 13 | struct Queue {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `new` is never used
[INFO] [stderr]   --> src/exercise/threads/threads3.rs:20:8
[INFO] [stderr]    |
[INFO] [stderr] 19 | impl Queue {
[INFO] [stderr]    | ---------- associated function in this implementation
[INFO] [stderr] 20 |     fn new() -> Self {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `send_tx` is never used
[INFO] [stderr]   --> src/exercise/threads/threads3.rs:29:4
[INFO] [stderr]    |
[INFO] [stderr] 29 | fn send_tx(q: Queue, tx: Arc<mpsc::Sender<u32>>) -> () {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `send_tx2` is never used
[INFO] [stderr]   --> src/exercise/threads/threads3.rs:48:4
[INFO] [stderr]    |
[INFO] [stderr] 48 | fn send_tx2(q: Queue, tx: mpsc::Sender<u32>) -> () {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]   --> src/exercise/macros/macros2.rs:16:4
[INFO] [stderr]    |
[INFO] [stderr] 16 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `byte_counter` is never used
[INFO] [stderr]   --> src/exercise/conversions/as_ref_mut.rs:14:4
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn byte_counter<T: AsRef<str>>(arg: T) -> usize {
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `char_counter` is never used
[INFO] [stderr]   --> src/exercise/conversions/as_ref_mut.rs:20:4
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn char_counter<T: AsRef<str>>(arg: T) -> usize {
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `num_sq` is never used
[INFO] [stderr]   --> src/exercise/conversions/as_ref_mut.rs:26:4
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn num_sq<T: AsMut<u32>>(arg: &mut T) {
[INFO] [stderr]    |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Person` is never constructed
[INFO] [stderr]   --> src/exercise/conversions/from_into.rs:11:8
[INFO] [stderr]    |
[INFO] [stderr] 11 | struct Person {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]   --> src/exercise/conversions/from_into.rs:80:4
[INFO] [stderr]    |
[INFO] [stderr] 80 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Person` is never constructed
[INFO] [stderr]   --> src/exercise/conversions/from_str.rs:16:8
[INFO] [stderr]    |
[INFO] [stderr] 16 | struct Person {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `ParsePersonError` is never used
[INFO] [stderr]   --> src/exercise/conversions/from_str.rs:23:6
[INFO] [stderr]    |
[INFO] [stderr] 23 | enum ParsePersonError {
[INFO] [stderr]    |      ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]   --> src/exercise/conversions/from_str.rs:77:4
[INFO] [stderr]    |
[INFO] [stderr] 77 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Color` is never constructed
[INFO] [stderr]   --> src/exercise/conversions/try_from_into.rs:15:8
[INFO] [stderr]    |
[INFO] [stderr] 15 | struct Color {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `IntoColorError` is never used
[INFO] [stderr]   --> src/exercise/conversions/try_from_into.rs:23:6
[INFO] [stderr]    |
[INFO] [stderr] 23 | enum IntoColorError {
[INFO] [stderr]    |      ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]   --> src/exercise/conversions/try_from_into.rs:98:4
[INFO] [stderr]    |
[INFO] [stderr] 98 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `average` is never used
[INFO] [stderr]   --> src/exercise/conversions/using_as.rs:15:4
[INFO] [stderr]    |
[INFO] [stderr] 15 | fn average(values: &[f64]) -> f64 {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]   --> src/exercise/conversions/using_as.rs:20:4
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]  --> src/exercise/strings/strings1.rs:9:4
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `current_favorite_color` is never used
[INFO] [stderr]   --> src/exercise/strings/strings1.rs:14:4
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn current_favorite_color() -> String {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]  --> src/exercise/strings/strings2.rs:9:4
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `is_a_color_word` is never used
[INFO] [stderr]   --> src/exercise/strings/strings2.rs:18:4
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn is_a_color_word(attempt: &str) -> bool {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `trim_me` is never used
[INFO] [stderr]  --> src/exercise/strings/strings3.rs:7:4
[INFO] [stderr]   |
[INFO] [stderr] 7 | fn trim_me(input: &str) -> String {
[INFO] [stderr]   |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `compose_me` is never used
[INFO] [stderr]   --> src/exercise/strings/strings3.rs:12:4
[INFO] [stderr]    |
[INFO] [stderr] 12 | fn compose_me(input: &str) -> String {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `replace_me` is never used
[INFO] [stderr]   --> src/exercise/strings/strings3.rs:17:4
[INFO] [stderr]    |
[INFO] [stderr] 17 | fn replace_me(input: &str) -> String {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `string_slice` is never used
[INFO] [stderr]   --> src/exercise/strings/strings4.rs:11:4
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn string_slice(arg: &str) {
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `string` is never used
[INFO] [stderr]   --> src/exercise/strings/strings4.rs:14:4
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn string(arg: String) {
[INFO] [stderr]    |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]   --> src/exercise/strings/strings4.rs:18:4
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `Message` is never used
[INFO] [stderr]  --> src/exercise/enums/enums1.rs:8:6
[INFO] [stderr]   |
[INFO] [stderr] 8 | enum Message {
[INFO] [stderr]   |      ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]   --> src/exercise/enums/enums1.rs:16:4
[INFO] [stderr]    |
[INFO] [stderr] 16 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `Message` is never used
[INFO] [stderr]  --> src/exercise/enums/enums2.rs:8:6
[INFO] [stderr]   |
[INFO] [stderr] 8 | enum Message {
[INFO] [stderr]   |      ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `call` is never used
[INFO] [stderr]   --> src/exercise/enums/enums2.rs:17:8
[INFO] [stderr]    |
[INFO] [stderr] 16 | impl Message {
[INFO] [stderr]    | ------------ method in this implementation
[INFO] [stderr] 17 |     fn call(&self) {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]   --> src/exercise/enums/enums2.rs:22:4
[INFO] [stderr]    |
[INFO] [stderr] 22 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `Message` is never used
[INFO] [stderr]   --> src/exercise/enums/enums3.rs:14:6
[INFO] [stderr]    |
[INFO] [stderr] 14 | enum Message {
[INFO] [stderr]    |      ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Point` is never constructed
[INFO] [stderr]   --> src/exercise/enums/enums3.rs:21:8
[INFO] [stderr]    |
[INFO] [stderr] 21 | struct Point {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `State` is never constructed
[INFO] [stderr]   --> src/exercise/enums/enums3.rs:26:8
[INFO] [stderr]    |
[INFO] [stderr] 26 | struct State {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: methods `change_color`, `quit`, `echo`, `move_position`, and `process` are never used
[INFO] [stderr]   --> src/exercise/enums/enums3.rs:34:8
[INFO] [stderr]    |
[INFO] [stderr] 33 | impl State {
[INFO] [stderr]    | ---------- methods in this implementation
[INFO] [stderr] 34 |     fn change_color(&mut self, color: (u8, u8, u8)) {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 38 |     fn quit(&mut self) {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] ...
[INFO] [stderr] 42 |     fn echo(&mut self, s: String) {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] ...
[INFO] [stderr] 46 |     fn move_position(&mut self, p: Point) {
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 50 |     fn process(&mut self, message: Message) {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `fill_vec` is never used
[INFO] [stderr]   --> src/exercise/move/move_semantics1.rs:16:4
[INFO] [stderr]    |
[INFO] [stderr] 16 | fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `fill_vec` is never used
[INFO] [stderr]   --> src/exercise/move/move_semantics2.rs:19:4
[INFO] [stderr]    |
[INFO] [stderr] 19 | fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `fill_vec` is never used
[INFO] [stderr]   --> src/exercise/move/move_semantics3.rs:18:4
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `fill_vec` is never used
[INFO] [stderr]   --> src/exercise/move/move_semantics4.rs:20:4
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn fill_vec(vec : Vec<i32>) -> Vec<i32> {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]  --> src/exercise/move/move_semantics6.rs:9:4
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn main() {
[INFO] [stderr]   |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `get_char` is never used
[INFO] [stderr]   --> src/exercise/move/move_semantics6.rs:18:4
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn get_char(data: &String) -> char {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `string_uppercase` is never used
[INFO] [stderr]   --> src/exercise/move/move_semantics6.rs:23:4
[INFO] [stderr]    |
[INFO] [stderr] 23 | fn string_uppercase(mut data: String) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `array_and_vec` is never used
[INFO] [stderr]   --> src/exercise/vecs/vecs1.rs:11:4
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn array_and_vec() -> ([i32; 4], Vec<i32>) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `vec_loop` is never used
[INFO] [stderr]   --> src/exercise/vecs/vecs2.rs:11:4
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn vec_loop(mut v: Vec<i32>) -> Vec<i32> {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `vec_map` is never used
[INFO] [stderr]   --> src/exercise/vecs/vecs2.rs:22:4
[INFO] [stderr]    |
[INFO] [stderr] 22 | fn vec_map(v: &Vec<i32>) -> Vec<i32> {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Solution` is never constructed
[INFO] [stderr]  --> src/leetcode/two_sum.rs:8:12
[INFO] [stderr]   |
[INFO] [stderr] 8 | pub struct Solution {
[INFO] [stderr]   |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `two_sum` is never used
[INFO] [stderr]   --> src/leetcode/two_sum.rs:12:12
[INFO] [stderr]    |
[INFO] [stderr] 11 | impl Solution {
[INFO] [stderr]    | ------------- associated function in this implementation
[INFO] [stderr] 12 |     pub fn two_sum(nums: Vec<i32>, target: i32) -> Vec<i32> {
[INFO] [stderr]    |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Solution` is never constructed
[INFO] [stderr]   --> src/leetcode/group_anagrams.rs:29:12
[INFO] [stderr]    |
[INFO] [stderr] 29 | pub struct Solution {
[INFO] [stderr]    |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant `BASE` is never used
[INFO] [stderr]   --> src/leetcode/group_anagrams.rs:32:7
[INFO] [stderr]    |
[INFO] [stderr] 32 | const BASE : i32 = 97;
[INFO] [stderr]    |       ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated functions `group_anagrams` and `encode` are never used
[INFO] [stderr]   --> src/leetcode/group_anagrams.rs:36:12
[INFO] [stderr]    |
[INFO] [stderr] 34 | impl Solution {
[INFO] [stderr]    | ------------- associated functions in this implementation
[INFO] [stderr] 35 |
[INFO] [stderr] 36 |     pub fn group_anagrams(strs: Vec<String>) -> Vec<Vec<String>> {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 73 |     pub fn encode(str: &str) -> String {
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Solution` is never constructed
[INFO] [stderr]   --> src/leetcode/longest_consecutive_sequence.rs:27:12
[INFO] [stderr]    |
[INFO] [stderr] 27 | pub struct Solution {}
[INFO] [stderr]    |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `longest_consecutive` is never used
[INFO] [stderr]   --> src/leetcode/longest_consecutive_sequence.rs:30:12
[INFO] [stderr]    |
[INFO] [stderr] 29 | impl Solution {
[INFO] [stderr]    | ------------- associated function in this implementation
[INFO] [stderr] 30 |     pub fn longest_consecutive(nums: Vec<i32>) -> i32 {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `test` is never used
[INFO] [stderr]   --> src/leetcode/longest_consecutive_sequence.rs:54:8
[INFO] [stderr]    |
[INFO] [stderr] 54 | pub fn test() {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Solution` is never constructed
[INFO] [stderr]   --> src/leetcode/three_sum.rs:32:12
[INFO] [stderr]    |
[INFO] [stderr] 32 | pub struct Solution {}
[INFO] [stderr]    |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `three_sum` is never used
[INFO] [stderr]   --> src/leetcode/three_sum.rs:36:12
[INFO] [stderr]    |
[INFO] [stderr] 35 | impl Solution {
[INFO] [stderr]    | ------------- associated function in this implementation
[INFO] [stderr] 36 |     pub fn three_sum(nums: Vec<i32>) -> Vec<Vec<i32>> {
[INFO] [stderr]    |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `ListNode` is never constructed
[INFO] [stderr]  --> src/leetcode/reverse_linked_list.rs:3:12
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub struct ListNode {
[INFO] [stderr]   |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `new` is never used
[INFO] [stderr]   --> src/leetcode/reverse_linked_list.rs:11:8
[INFO] [stderr]    |
[INFO] [stderr]  9 | impl ListNode {
[INFO] [stderr]    | ------------- associated function in this implementation
[INFO] [stderr] 10 |     #[inline]
[INFO] [stderr] 11 |     fn new(val: i32) -> Self {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Solution` is never constructed
[INFO] [stderr]   --> src/leetcode/reverse_linked_list.rs:19:12
[INFO] [stderr]    |
[INFO] [stderr] 19 | pub struct Solution {}
[INFO] [stderr]    |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated functions `reverse_list`, `reverse_list2`, `reverse_list3`, and `reverse_list5` are never used
[INFO] [stderr]   --> src/leetcode/reverse_linked_list.rs:22:12
[INFO] [stderr]    |
[INFO] [stderr] 21 | impl Solution {
[INFO] [stderr]    | ------------- associated functions in this implementation
[INFO] [stderr] 22 |     pub fn reverse_list(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stderr]    |            ^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 36 |     pub fn reverse_list2(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stderr]    |            ^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 48 |     pub fn reverse_list3(mut head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stderr]    |            ^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 73 |     pub fn reverse_list5(mut head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stderr]    |            ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `ListNode` is never constructed
[INFO] [stderr]  --> src/leetcode/merge_two_sorted_lists.rs:4:12
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub struct ListNode {
[INFO] [stderr]   |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `new` is never used
[INFO] [stderr]   --> src/leetcode/merge_two_sorted_lists.rs:12:8
[INFO] [stderr]    |
[INFO] [stderr] 10 | impl ListNode {
[INFO] [stderr]    | ------------- associated function in this implementation
[INFO] [stderr] 11 |     #[inline]
[INFO] [stderr] 12 |     fn new(val: i32) -> Self {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Solution` is never constructed
[INFO] [stderr]   --> src/leetcode/merge_two_sorted_lists.rs:20:12
[INFO] [stderr]    |
[INFO] [stderr] 20 | pub struct Solution {}
[INFO] [stderr]    |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated functions `merge_two_lists`, `merge_two_lists2`, and `merge_two_lists3` are never used
[INFO] [stderr]   --> src/leetcode/merge_two_sorted_lists.rs:23:12
[INFO] [stderr]    |
[INFO] [stderr] 22 | impl Solution {
[INFO] [stderr]    | ------------- associated functions in this implementation
[INFO] [stderr] 23 |     pub fn merge_two_lists(list1: Option<Box<ListNode>>, list2: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 52 |     pub fn merge_two_lists2(list1: Option<Box<ListNode>>, list2: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 72 |     pub fn merge_two_lists3(list1: Option<Box<ListNode>>, list2: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `ListNode` is never constructed
[INFO] [stderr]  --> src/leetcode/add_two_numbers.rs:7:12
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub struct ListNode {
[INFO] [stderr]   |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `new` is never used
[INFO] [stderr]   --> src/leetcode/add_two_numbers.rs:14:6
[INFO] [stderr]    |
[INFO] [stderr] 12 | impl ListNode {
[INFO] [stderr]    | ------------- associated function in this implementation
[INFO] [stderr] 13 |   #[inline]
[INFO] [stderr] 14 |   fn new(val: i32) -> Self {
[INFO] [stderr]    |      ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Solution` is never constructed
[INFO] [stderr]   --> src/leetcode/add_two_numbers.rs:22:8
[INFO] [stderr]    |
[INFO] [stderr] 22 | struct Solution{}
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated functions `add_two_numbers`, `add`, and `one_none` are never used
[INFO] [stderr]   --> src/leetcode/add_two_numbers.rs:25:12
[INFO] [stderr]    |
[INFO] [stderr] 24 | impl Solution {
[INFO] [stderr]    | ------------- associated functions in this implementation
[INFO] [stderr] 25 |     pub fn add_two_numbers(l1: Option<Box<ListNode>>, l2: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 29 |     pub fn add(l1: Option<Box<ListNode>>, l2: Option<Box<ListNode>>, x:i32) -> Option<Box<ListNode>> {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] ...
[INFO] [stderr] 55 |     fn one_none(x: i32, node: Box<ListNode>) -> Option<Box<ListNode>> {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `ListNode` is never constructed
[INFO] [stderr]  --> src/leetcode/lru.rs:6:12
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct ListNode {
[INFO] [stderr]   |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `new` is never used
[INFO] [stderr]   --> src/leetcode/lru.rs:15:8
[INFO] [stderr]    |
[INFO] [stderr] 13 | impl ListNode {
[INFO] [stderr]    | ------------- associated function in this implementation
[INFO] [stderr] 14 |     #[inline]
[INFO] [stderr] 15 |     fn new(key: i32, val: i32) -> Self {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `LRUCache` is never constructed
[INFO] [stderr]   --> src/leetcode/lru.rs:26:8
[INFO] [stderr]    |
[INFO] [stderr] 26 | struct LRUCache {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new`, `get`, `put`, `add_to_head`, `remove_last`, and `move_to_head` are never used
[INFO] [stderr]    --> src/leetcode/lru.rs:36:8
[INFO] [stderr]     |
[INFO] [stderr]  35 | impl LRUCache {
[INFO] [stderr]     | ------------- associated items in this implementation
[INFO] [stderr]  36 |     fn new(capacity: i32) -> Self {
[INFO] [stderr]     |        ^^^
[INFO] [stderr] ...
[INFO] [stderr]  48 |     fn get(&mut self, key: i32) -> i32 {
[INFO] [stderr]     |        ^^^
[INFO] [stderr] ...
[INFO] [stderr]  58 |     fn put(&mut self, key: i32, value: i32) {
[INFO] [stderr]     |        ^^^
[INFO] [stderr] ...
[INFO] [stderr]  74 |     fn add_to_head(&mut self, node_rc: Rc<RefCell<ListNode>>) {
[INFO] [stderr]     |        ^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr]  91 |     fn remove_last(&mut self) -> i32 {
[INFO] [stderr]     |        ^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 102 |     fn move_to_head(&mut self, node_rc: Rc<RefCell<ListNode>>) {
[INFO] [stderr]     |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Node` is never constructed
[INFO] [stderr]  --> src/leetcode/lru2.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | struct Node {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `new` is never used
[INFO] [stderr]   --> src/leetcode/lru2.rs:13:8
[INFO] [stderr]    |
[INFO] [stderr] 12 | impl Node {
[INFO] [stderr]    | --------- associated function in this implementation
[INFO] [stderr] 13 |     fn new(key: i32, value: i32) -> Rc<RefCell<Self>> {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `LRUCache` is never constructed
[INFO] [stderr]   --> src/leetcode/lru2.rs:18:8
[INFO] [stderr]    |
[INFO] [stderr] 18 | struct LRUCache {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new`, `get`, `put`, `remove`, and `push_front` are never used
[INFO] [stderr]   --> src/leetcode/lru2.rs:25:12
[INFO] [stderr]    |
[INFO] [stderr] 24 | impl LRUCache {
[INFO] [stderr]    | ------------- associated items in this implementation
[INFO] [stderr] 25 |     pub fn new(capacity: i32) -> Self {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] ...
[INFO] [stderr] 32 |     pub fn get(&mut self, key: i32) -> i32 {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] ...
[INFO] [stderr] 43 |     pub fn put(&mut self, key: i32, value: i32) {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] ...
[INFO] [stderr] 62 |     fn remove(&mut self, x: Rc<RefCell<Node>>) {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 70 |     fn push_front(&mut self, x: Rc<RefCell<Node>>) {
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Song` is never constructed
[INFO] [stderr]  --> src/async_demo/ayn_demo.rs:5:12
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub struct Song {}
[INFO] [stderr]   |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `learn_song` is never used
[INFO] [stderr]  --> src/async_demo/ayn_demo.rs:7:10
[INFO] [stderr]   |
[INFO] [stderr] 7 | async fn learn_song() -> Song {
[INFO] [stderr]   |          ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `sing_song` is never used
[INFO] [stderr]   --> src/async_demo/ayn_demo.rs:15:10
[INFO] [stderr]    |
[INFO] [stderr] 15 | async fn sing_song(song: Song) {
[INFO] [stderr]    |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `dance` is never used
[INFO] [stderr]   --> src/async_demo/ayn_demo.rs:22:10
[INFO] [stderr]    |
[INFO] [stderr] 22 | async fn dance() {
[INFO] [stderr]    |          ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `learn_and_sing` is never used
[INFO] [stderr]   --> src/async_demo/ayn_demo.rs:29:10
[INFO] [stderr]    |
[INFO] [stderr] 29 | async fn learn_and_sing() {
[INFO] [stderr]    |          ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `async_main` is never used
[INFO] [stderr]   --> src/async_demo/ayn_demo.rs:34:10
[INFO] [stderr]    |
[INFO] [stderr] 34 | async fn async_main() {
[INFO] [stderr]    |          ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `TimerFuture` is never constructed
[INFO] [stderr]   --> src/async_demo/waker_test.rs:11:12
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub struct TimerFuture {
[INFO] [stderr]    |            ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `SharedState` is never constructed
[INFO] [stderr]   --> src/async_demo/waker_test.rs:16:8
[INFO] [stderr]    |
[INFO] [stderr] 16 | struct SharedState {
[INFO] [stderr]    |        ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `new` is never used
[INFO] [stderr]   --> src/async_demo/waker_test.rs:57:12
[INFO] [stderr]    |
[INFO] [stderr] 54 | impl TimerFuture {
[INFO] [stderr]    | ---------------- associated function in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 57 |     pub fn new(duration: Duration) -> Self {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Spawner` is never constructed
[INFO] [stderr]   --> src/async_demo/excutor.rs:19:8
[INFO] [stderr]    |
[INFO] [stderr] 19 | struct Spawner {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `spawn` is never used
[INFO] [stderr]   --> src/async_demo/excutor.rs:24:8
[INFO] [stderr]    |
[INFO] [stderr] 23 | impl Spawner {
[INFO] [stderr]    | ------------ method in this implementation
[INFO] [stderr] 24 |     fn spawn(&self, future: impl Future<Output = ()> + 'static + Send) {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Executor` is never constructed
[INFO] [stderr]   --> src/async_demo/excutor.rs:35:8
[INFO] [stderr]    |
[INFO] [stderr] 35 | struct Executor {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `run` is never used
[INFO] [stderr]   --> src/async_demo/excutor.rs:40:8
[INFO] [stderr]    |
[INFO] [stderr] 39 | impl Executor {
[INFO] [stderr]    | ------------- method in this implementation
[INFO] [stderr] 40 |     fn run(&self) {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Task` is never constructed
[INFO] [stderr]   --> src/async_demo/excutor.rs:70:8
[INFO] [stderr]    |
[INFO] [stderr] 70 | struct Task {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `new_executor_and_spawner` is never used
[INFO] [stderr]   --> src/async_demo/excutor.rs:98:4
[INFO] [stderr]    |
[INFO] [stderr] 98 | fn new_executor_and_spawner() -> (Executor, Spawner) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: comparison is useless due to type limits
[INFO] [stderr]   --> src/exercise/option/options1.rs:16:8
[INFO] [stderr]    |
[INFO] [stderr] 16 |     if time_of_day < 0 || time_of_day > 23 {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trailing semicolon in macro used in expression position
[INFO] [stderr]   --> src/exercise/macros/macros1.rs:10:40
[INFO] [stderr]    |
[INFO] [stderr] 10 |         println!("Check out my macro!");
[INFO] [stderr]    |                                        ^
[INFO] [stderr] ...
[INFO] [stderr] 16 |     my_macro!()
[INFO] [stderr]    |     ----------- in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]    = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
[INFO] [stderr]    = note: macro invocations at the end of a block are treated as expressions
[INFO] [stderr]    = note: to ignore the value produced by the macro, add a semicolon after the invocation of `my_macro`
[INFO] [stderr]    = note: `#[warn(semicolon_in_expressions_from_macros)]` on by default
[INFO] [stderr]    = note: this warning originates in the macro `my_macro` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]    --> src/leetcode/merge_two_sorted_lists.rs:115:9
[INFO] [stderr]     |
[INFO] [stderr] 115 |     use super::*;
[INFO] [stderr]     |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stderr]  --> src/some_thing/unsafe_demo.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let r1 = &num as *const i32;
[INFO] [stderr]   |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/some_thing/unsafe_demo.rs:11:9
[INFO] [stderr]    |
[INFO] [stderr] 11 |     let mut k = &mut num;
[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/exercise/move/move_semantics1.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let mut vec0 = vec![22, 44, 66];
[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/exercise/move/move_semantics1.rs:16:13
[INFO] [stderr]    |
[INFO] [stderr] 16 | fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
[INFO] [stderr]    |             ----^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]  --> src/some_thing/circle_ref_demo.rs:7:10
[INFO] [stderr]   |
[INFO] [stderr] 7 |     Cons(i32, RefCell<Rc<List>>),
[INFO] [stderr]   |     ---- ^^^
[INFO] [stderr]   |     |
[INFO] [stderr]   |     field in this variant
[INFO] [stderr]   |
[INFO] [stderr]   = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]   |
[INFO] [stderr] 7 -     Cons(i32, RefCell<Rc<List>>),
[INFO] [stderr] 7 +     Cons((), RefCell<Rc<List>>),
[INFO] [stderr]   |
[INFO] [stderr] 
[INFO] [stderr] warning: field `age` is never read
[INFO] [stderr]   --> src/some_thing/close2_demo.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 20 | struct Person {
[INFO] [stderr]    |        ------ field in this struct
[INFO] [stderr] 21 |     name : String,
[INFO] [stderr] 22 |     age : i32
[INFO] [stderr]    |     ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Person` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: method `age` is never used
[INFO] [stderr]   --> src/some_thing/close2_demo.rs:31:12
[INFO] [stderr]    |
[INFO] [stderr] 26 | impl Person {
[INFO] [stderr]    | ----------- method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 31 |     pub fn age(&self) -> i32 {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field `age` is never read
[INFO] [stderr]   --> src/some_thing/close3_demo.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 21 | struct Person {
[INFO] [stderr]    |        ------ field in this struct
[INFO] [stderr] 22 |     name: String,
[INFO] [stderr] 23 |     age: i32,
[INFO] [stderr]    |     ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Person` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: method `name` is never used
[INFO] [stderr]   --> src/some_thing/close3_demo.rs:27:12
[INFO] [stderr]    |
[INFO] [stderr] 26 | impl Person {
[INFO] [stderr]    | ----------- method in this implementation
[INFO] [stderr] 27 |     pub fn name(&self) -> &String {
[INFO] [stderr]    |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: fields `value` and `children` are never read
[INFO] [stderr]  --> src/some_thing/tree_demo.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | struct Node {
[INFO] [stderr]   |        ---- fields in this struct
[INFO] [stderr] 6 |     value: i32,
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr] 7 |     parent: RefCell<Weak<Node>>,
[INFO] [stderr] 8 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: field `version_number` is never read
[INFO] [stderr]   --> src/exercise/traits/traits3.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 19 | struct SomeSoftware {
[INFO] [stderr]    |        ------------ field in this struct
[INFO] [stderr] 20 |     version_number: i32,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field `version_number` is never read
[INFO] [stderr]   --> src/exercise/traits/traits3.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 23 | struct OtherSoftware {
[INFO] [stderr]    |        ------------- field in this struct
[INFO] [stderr] 24 |     version_number: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/exercise/smart_pointers/rc1.rs:22:13
[INFO] [stderr]    |
[INFO] [stderr] 22 |     Mercury(Rc<Sun>),
[INFO] [stderr]    |     ------- ^^^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Planet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 22 -     Mercury(Rc<Sun>),
[INFO] [stderr] 22 +     Mercury(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/exercise/smart_pointers/rc1.rs:23:11
[INFO] [stderr]    |
[INFO] [stderr] 23 |     Venus(Rc<Sun>),
[INFO] [stderr]    |     ----- ^^^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Planet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 23 -     Venus(Rc<Sun>),
[INFO] [stderr] 23 +     Venus(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/exercise/smart_pointers/rc1.rs:24:11
[INFO] [stderr]    |
[INFO] [stderr] 24 |     Earth(Rc<Sun>),
[INFO] [stderr]    |     ----- ^^^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Planet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 24 -     Earth(Rc<Sun>),
[INFO] [stderr] 24 +     Earth(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/exercise/smart_pointers/rc1.rs:25:10
[INFO] [stderr]    |
[INFO] [stderr] 25 |     Mars(Rc<Sun>),
[INFO] [stderr]    |     ---- ^^^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Planet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 25 -     Mars(Rc<Sun>),
[INFO] [stderr] 25 +     Mars(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/exercise/smart_pointers/rc1.rs:26:13
[INFO] [stderr]    |
[INFO] [stderr] 26 |     Jupiter(Rc<Sun>),
[INFO] [stderr]    |     ------- ^^^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Planet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 26 -     Jupiter(Rc<Sun>),
[INFO] [stderr] 26 +     Jupiter(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/exercise/smart_pointers/rc1.rs:27:12
[INFO] [stderr]    |
[INFO] [stderr] 27 |     Saturn(Rc<Sun>),
[INFO] [stderr]    |     ------ ^^^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Planet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 27 -     Saturn(Rc<Sun>),
[INFO] [stderr] 27 +     Saturn(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/exercise/smart_pointers/rc1.rs:28:12
[INFO] [stderr]    |
[INFO] [stderr] 28 |     Uranus(Rc<Sun>),
[INFO] [stderr]    |     ------ ^^^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Planet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 28 -     Uranus(Rc<Sun>),
[INFO] [stderr] 28 +     Uranus(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/exercise/smart_pointers/rc1.rs:29:13
[INFO] [stderr]    |
[INFO] [stderr] 29 |     Neptune(Rc<Sun>),
[INFO] [stderr]    |     ------- ^^^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Planet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 29 -     Neptune(Rc<Sun>),
[INFO] [stderr] 29 +     Neptune(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `encode` is never used
[INFO] [stderr]   --> src/leetcode/group_anagrams.rs:73:12
[INFO] [stderr]    |
[INFO] [stderr] 34 | impl Solution {
[INFO] [stderr]    | ------------- associated function in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 73 |     pub fn encode(str: &str) -> String {
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated functions `reverse_list`, `reverse_list2`, and `reverse_list3` are never used
[INFO] [stderr]   --> src/leetcode/reverse_linked_list.rs:22:12
[INFO] [stderr]    |
[INFO] [stderr] 21 | impl Solution {
[INFO] [stderr]    | ------------- associated functions in this implementation
[INFO] [stderr] 22 |     pub fn reverse_list(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stderr]    |            ^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 36 |     pub fn reverse_list2(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stderr]    |            ^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 48 |     pub fn reverse_list3(mut head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stderr]    |            ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/some_thing/thread_demo.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     handle1.join();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 24 |     let _ = handle1.join();
[INFO] [stderr]    |     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/some_thing/thread_demo.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 |     handle2.join();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 25 |     let _ = handle2.join();
[INFO] [stderr]    |     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: path statement with no effect
[INFO] [stderr]   --> src/exercise/option/options3.rs:21:5
[INFO] [stderr]    |
[INFO] [stderr] 21 |     y; // Fix without deleting this line.
[INFO] [stderr]    |     ^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(path_statements)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `demo` (lib) generated 235 warnings (run `cargo fix --lib -p demo` to apply 28 suggestions)
[INFO] [stderr] warning: `demo` (lib test) generated 110 warnings (83 duplicates) (run `cargo fix --lib -p demo --tests` to apply 4 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.28s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: demo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 4`
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/demo-a17b463b7fa111c4)
[INFO] [stdout] 
[INFO] [stdout] running 151 tests
[INFO] [stdout] test exercise::conversions::as_ref_mut::tests::different_counts_using_string ... ok
[INFO] [stdout] test exercise::conversions::as_ref_mut::tests::different_counts ... ok
[INFO] [stdout] test exercise::conversions::as_ref_mut::tests::same_counts ... ok
[INFO] [stdout] test exercise::conversions::as_ref_mut::tests::mut_box ... ok
[INFO] [stdout] test exercise::conversions::from_into::tests::test_bad_age ... ok
[INFO] [stdout] test exercise::conversions::from_into::tests::test_default ... ok
[INFO] [stdout] test exercise::conversions::as_ref_mut::tests::same_counts_using_string ... ok
[INFO] [stdout] test exercise::conversions::from_into::tests::test_good_convert ... ok
[INFO] [stdout] test exercise::conversions::from_into::tests::test_bad_convert ... ok
[INFO] [stdout] test exercise::conversions::from_into::tests::test_missing_age ... ok
[INFO] [stdout] test exercise::conversions::from_into::tests::test_missing_comma_and_age ... ok
[INFO] [stdout] test exercise::conversions::from_into::tests::test_missing_name_and_invalid_age ... ok
[INFO] [stdout] test exercise::conversions::from_into::tests::test_trailing_comma ... ok
[INFO] [stdout] test exercise::conversions::from_into::tests::test_trailing_comma_and_some_string ... ok
[INFO] [stdout] test exercise::conversions::from_str::tests::empty_input ... ok
[INFO] [stdout] test exercise::conversions::from_str::tests::good_input ... ok
[INFO] [stdout] test exercise::conversions::from_str::tests::missing_age ... ok
[INFO] [stdout] test exercise::conversions::from_into::tests::test_missing_name ... ok
[INFO] [stdout] test exercise::conversions::from_into::tests::test_missing_name_and_age ... ok
[INFO] [stdout] test exercise::conversions::from_str::tests::missing_comma_and_age ... ok
[INFO] [stdout] test exercise::conversions::from_str::tests::missing_name ... ok
[INFO] [stdout] test exercise::conversions::from_str::tests::missing_name_and_invalid_age ... ok
[INFO] [stdout] test exercise::conversions::from_str::tests::missing_name_and_age ... ok
[INFO] [stdout] test exercise::conversions::from_str::tests::trailing_comma ... ok
[INFO] [stdout] test exercise::conversions::from_str::tests::trailing_comma_and_some_string ... ok
[INFO] [stdout] test exercise::conversions::try_from_into::tests::test_array_correct ... ok
[INFO] [stdout] test exercise::conversions::try_from_into::tests::test_array_out_of_range_negative ... ok
[INFO] [stdout] test exercise::conversions::try_from_into::tests::test_slice_correct ... ok
[INFO] [stdout] test exercise::conversions::try_from_into::tests::test_array_out_of_range_positive ... ok
[INFO] [stdout] test exercise::conversions::try_from_into::tests::test_array_sum ... ok
[INFO] [stdout] test exercise::conversions::try_from_into::tests::test_slice_excess_length ... ok
[INFO] [stdout] test exercise::conversions::try_from_into::tests::test_slice_insufficient_length ... ok
[INFO] [stdout] test exercise::conversions::try_from_into::tests::test_slice_out_of_range_negative ... ok
[INFO] [stdout] test exercise::conversions::try_from_into::tests::test_slice_out_of_range_positive ... ok
[INFO] [stdout] test exercise::conversions::try_from_into::tests::test_slice_sum ... ok
[INFO] [stdout] test exercise::conversions::try_from_into::tests::test_tuple_correct ... ok
[INFO] [stdout] test exercise::conversions::try_from_into::tests::test_tuple_sum ... ok
[INFO] [stdout] test exercise::conversions::try_from_into::tests::test_tuple_out_of_range_negative ... ok
[INFO] [stdout] test exercise::conversions::try_from_into::tests::test_tuple_out_of_range_positive ... ok
[INFO] [stdout] test exercise::conversions::using_as::tests::returns_proper_type_and_value ... ok
[INFO] [stdout] test exercise::enums::enums3::tests::test_match_message_call ... ok
[INFO] [stdout] test exercise::error::errors1::tests::explains_why_generating_nametag_text_fails ... ok
[INFO] [stdout] test exercise::error::errors1::tests::generates_nametag_text_for_a_nonempty_name ... ok
[INFO] [stdout] test exercise::error::errors2::tests::item_quantity_is_a_valid_number ... ok
[INFO] [stdout] test exercise::error::errors2::tests::item_quantity_is_an_invalid_number ... ok
[INFO] [stdout] test exercise::error::errors3::main ... ok
[INFO] [stdout] test exercise::error::errors4::test_creation ... ok
[INFO] [stdout] test exercise::error::errors6::test::test_parse_error ... ok
[INFO] [stdout] test exercise::error::errors6::test::test_negative ... ok
[INFO] [stdout] test exercise::error::errors6::test::test_positive ... ok
[INFO] [stdout] test exercise::generics::generics2::tests::store_str_in_wrapper ... ok
[INFO] [stdout] test exercise::conversions::from_str::tests::invalid_age ... ok
[INFO] [stdout] test exercise::error::errors6::test::test_zero ... ok
[INFO] [stdout] test exercise::generics::generics2::tests::store_u32_in_wrapper ... ok
[INFO] [stdout] test exercise::hashmap::hashmap3::tests::build_scores ... ok
[INFO] [stdout] test exercise::hashmap::hashmap3::tests::validate_team_score_1 ... ok
[INFO] [stdout] test exercise::hashmap::hashmap3::tests::validate_team_score_2 ... ok
[INFO] [stdout] test exercise::iterators::iterators1::test ... ok
[INFO] [stdout] test exercise::iterators::iterators2::tests::test_empty ... ok
[INFO] [stdout] test exercise::iterators::iterators2::tests::test_iterate_into_string ... ok
[INFO] [stdout] test exercise::iterators::iterators2::tests::test_success ... ok
[INFO] [stdout] test exercise::iterators::iterators2::tests::test_iterate_string_vec ... ok
[INFO] [stdout] test exercise::iterators::iterators3::tests::test_divide_0_by_something ... ok
[INFO] [stdout] test exercise::iterators::iterators3::tests::test_divide_by_0 ... ok
[INFO] [stdout] test exercise::iterators::iterators3::tests::test_list_of_results ... ok
[INFO] [stdout] test exercise::iterators::iterators3::tests::test_not_divisible ... ok
[INFO] [stdout] test exercise::iterators::iterators3::tests::test_result_with_list ... ok
[INFO] [stdout] test exercise::iterators::iterators3::tests::test_success ... ok
[INFO] [stdout] test exercise::iterators::iterators4::tests::factorial_of_0 ... ok
[INFO] [stdout] test exercise::iterators::iterators4::tests::factorial_of_1 ... ok
[INFO] [stdout] test exercise::iterators::iterators4::tests::factorial_of_2 ... ok
[INFO] [stdout] test exercise::iterators::iterators4::tests::factorial_of_4 ... ok
[INFO] [stdout] test exercise::iterators::iterators5::tests::count_collection_complete ... ok
[INFO] [stdout] test exercise::iterators::iterators5::tests::count_collection_equals_for ... ok
[INFO] [stdout] test exercise::iterators::iterators5::tests::count_collection_none ... ok
[INFO] [stdout] test exercise::iterators::iterators5::tests::count_collection_some ... ok
[INFO] [stdout] test exercise::iterators::iterators5::tests::count_complete ... ok
[INFO] [stdout] test exercise::iterators::iterators5::tests::count_complete_equals_for ... ok
[INFO] [stdout] test exercise::iterators::iterators5::tests::count_none ... ok
[INFO] [stdout] test exercise::iterators::iterators5::tests::count_some ... ok
[INFO] [stdout] test exercise::lifetimes::lifetimes1::test ... ok
[INFO] [stdout] test exercise::lifetimes::lifetimes3::test ... ok
[INFO] [stdout] test exercise::lifetimes::lifetimes2::test ... ok
[INFO] [stdout] test exercise::macros::macros4::test ... ok
[INFO] [stdout] test exercise::option::options1::tests::check_icecream ... ok
[INFO] [stdout] test exercise::option::options1::tests::raw_value ... ok
[INFO] [stdout] test exercise::option::options2::tests::layered_option ... ok
[INFO] [stdout] test exercise::macros::macros1::test ... ok
[INFO] [stdout] test exercise::option::options2::tests::simple_option ... ok
[INFO] [stdout] test exercise::macros::macros3::test ... ok
[INFO] [stdout] test exercise::option::options3::test ... ok
[INFO] [stdout] test exercise::r#move::move_semantics1::main ... ok
[INFO] [stdout] test exercise::r#move::move_semantics2::main ... ok
[INFO] [stdout] test exercise::r#move::move_semantics5::main ... ok
[INFO] [stdout] test exercise::r#move::move_semantics4::main ... ok
[INFO] [stdout] test exercise::smart_pointers::arc1::test ... ok
[INFO] [stdout] test exercise::r#move::move_semantics3::main ... ok
[INFO] [stdout] test exercise::smart_pointers::box1::tests::test_create_non_empty_list ... ok
[INFO] [stdout] test exercise::smart_pointers::box1::tests::test_create_empty_list ... ok
[INFO] [stdout] test exercise::smart_pointers::cow1::tests::reference_mutation ... ok
[INFO] [stdout] test exercise::smart_pointers::cow1::tests::reference_no_mutation ... ok
[INFO] [stdout] test exercise::smart_pointers::rc1::main ... ok
[INFO] [stdout] test exercise::strings::strings3::tests::compose_a_string ... ok
[INFO] [stdout] test exercise::strings::strings3::tests::replace_a_string ... ok
[INFO] [stdout] test exercise::smart_pointers::cow1::tests::owned_no_mutation ... ok
[INFO] [stdout] test exercise::strings::strings3::tests::trim_a_string ... ok
[INFO] [stdout] test exercise::smart_pointers::cow1::tests::owned_mutation ... ok
[INFO] [stdout] test exercise::error::errors5::test ... FAILED
[INFO] [stdout] test exercise::traits::traits1::tests::is_bar_bar ... ok
[INFO] [stdout] test exercise::traits::traits1::tests::is_foo_bar ... ok
[INFO] [stdout] test exercise::traits::traits2::tests::is_vec_pop_eq_bar ... ok
[INFO] [stdout] test exercise::traits::traits3::tests::is_licensing_info_the_same ... ok
[INFO] [stdout] test exercise::traits::traits4::tests::compare_license_information ... ok
[INFO] [stdout] test exercise::traits::traits4::tests::compare_license_information_backwards ... ok
[INFO] [stdout] test exercise::vecs::vecs1::tests::test_array_and_vec_similarity ... ok
[INFO] [stdout] test exercise::vecs::vecs2::tests::test_vec_loop ... ok
[INFO] [stdout] test exercise::vecs::vecs2::tests::test_vec_map ... ok
[INFO] [stdout] test leetcode::add_two_numbers::test::test1 ... ok
[INFO] [stdout] test leetcode::group_anagrams::test ... ok
[INFO] [stdout] test leetcode::lru::test::test1 ... ok
[INFO] [stdout] test leetcode::merge_two_sorted_lists::test::test1 ... ok
[INFO] [stdout] test leetcode::reverse_linked_list::main ... ok
[INFO] [stdout] test leetcode::three_sum::test::test1 ... ok
[INFO] [stdout] test leetcode::three_sum::test::test2 ... ok
[INFO] [stdout] test leetcode::three_sum::test::test3 ... ok
[INFO] [stdout] test leetcode::three_sum::test::test4 ... ok
[INFO] [stdout] test leetcode::two_sum::test ... ok
[INFO] [stdout] test exercise::threads::threads1::test ... ok
[INFO] [stdout] test some_thing::circle_ref_demo::test ... ok
[INFO] [stdout] test some_thing::close2_demo::test ... ok
[INFO] [stdout] test exercise::threads::threads2::test ... ok
[INFO] [stdout] test some_thing::close3_demo::test ... ok
[INFO] [stdout] test some_thing::close_demo::test ... ok
[INFO] [stdout] test some_thing::hash_demo::hash_test ... ok
[INFO] [stdout] test some_thing::pin_test::pin1_demo::test ... ok
[INFO] [stdout] test some_thing::pin_test::pin2_demo::test ... ok
[INFO] [stdout] test some_thing::pin_test::pin3_demo::test ... ok
[INFO] [stdout] test some_thing::string_demo::string_test ... ok
[INFO] [stdout] test some_thing::pin_test::pin2_demo::test2 ... ok
[INFO] [stdout] test some_thing::thread_demo::test2 ... ok
[INFO] [stdout] test some_thing::trait_demo::test ... ok
[INFO] [stdout] test some_thing::tree_demo::test ... ok
[INFO] [stdout] test some_thing::unsafe_demo::test1 ... ok
[INFO] [stdout] test some_thing::unsafe_demo::test2 ... ok
[INFO] [stdout] test async_demo::waker_test::tests::test_timer_future ... ok
[INFO] [stdout] test async_demo::waker_test::tests::test_multiple_timers ... ok
[INFO] [stdout] test async_demo::excutor::main ... ok
[INFO] [stdout] test async_demo::ayn_demo::test ... ok
[INFO] [stdout] test some_thing::async_test::test ... ok
[INFO] [stdout] test some_thing::thread_demo::test1 ... ok
[INFO] [stdout] test exercise::threads::threads3::test ... ok
[INFO] [stderr] error: test failed, to rerun pass `--lib`
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- exercise::error::errors5::test stdout ----
[INFO] [stdout] 
[INFO] [stdout] thread 'exercise::error::errors5::test' panicked at src/exercise/error/errors5.rs:33:14:
[INFO] [stdout] called `Result::unwrap()` on an `Err` value: Negative
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x5fa3675fba32 - std::backtrace_rs::backtrace::libunwind::trace::h2d45396358f41939
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x5fa3675fba32 - std::backtrace_rs::backtrace::trace_unsynchronized::hffcefc0b67f1d6e2
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x5fa3675fba32 - std::sys::backtrace::_print_fmt::hd72f71d23b436b92
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/sys/backtrace.rs:66:9
[INFO] [stdout]    3:     0x5fa3675fba32 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hdcfcb6d4c8489523
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/sys/backtrace.rs:39:26
[INFO] [stdout]    4:     0x5fa367622013 - core::fmt::rt::Argument::fmt::h2c56b3114963061a
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/fmt/rt.rs:173:76
[INFO] [stdout]    5:     0x5fa367622013 - core::fmt::write::h8a494366950f23bb
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/fmt/mod.rs:1468:25
[INFO] [stdout]    6:     0x5fa3675f8663 - std::io::default_write_fmt::h7b8824096454f323
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/io/mod.rs:639:11
[INFO] [stdout]    7:     0x5fa3675f8663 - std::io::Write::write_fmt::h4e71294925c334d0
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/io/mod.rs:1954:13
[INFO] [stdout]    8:     0x5fa3675fb882 - std::sys::backtrace::BacktraceLock::print::hb2a626a81e06b2dc
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/sys/backtrace.rs:42:9
[INFO] [stdout]    9:     0x5fa3675fcfb9 - std::panicking::default_hook::{{closure}}::h4f78485264f12d10
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/panicking.rs:300:27
[INFO] [stdout]   10:     0x5fa3675fcdee - std::panicking::default_hook::h2c66fc99e962531d
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/panicking.rs:324:9
[INFO] [stdout]   11:     0x5fa3675186f4 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hb6bd65493727d71a
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/alloc/src/boxed.rs:1985:9
[INFO] [stdout]   12:     0x5fa3675186f4 - test::test_main_with_exit_callback::{{closure}}::h60217ec76a0ece4a
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/test/src/lib.rs:145:21
[INFO] [stdout]   13:     0x5fa3675fda8e - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h318e4efb8c1a5689
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/alloc/src/boxed.rs:1985:9
[INFO] [stdout]   14:     0x5fa3675fda8e - std::panicking::rust_panic_with_hook::h33ac55f64bbd807d
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/panicking.rs:841:13
[INFO] [stdout]   15:     0x5fa3675fd75a - std::panicking::begin_panic_handler::{{closure}}::h30e7cb89678a57fe
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/panicking.rs:706:13
[INFO] [stdout]   16:     0x5fa3675fbf39 - std::sys::backtrace::__rust_end_short_backtrace::hed60f27456c16ced
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/sys/backtrace.rs:174:18
[INFO] [stdout]   17:     0x5fa3675fd3ed - __rustc[de2ca18b4c54d5b8]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/panicking.rs:697:5
[INFO] [stdout]   18:     0x5fa36761fdb0 - core::panicking::panic_fmt::h62f63d096dd276af
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/panicking.rs:75:14
[INFO] [stdout]   19:     0x5fa367620276 - core::result::unwrap_failed::h95bc3f5a607b2c95
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/result.rs:1765:5
[INFO] [stdout]   20:     0x5fa36749923b - core::result::Result<T,E>::unwrap::hf22b117dbd285c5c
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/result.rs:1167:23
[INFO] [stdout]   21:     0x5fa36749923b - demo::exercise::error::errors5::test::hcf17434640ba0283
[INFO] [stdout]                                at /opt/rustwide/workdir/src/exercise/error/errors5.rs:33:14
[INFO] [stdout]   22:     0x5fa3674991b7 - demo::exercise::error::errors5::test::{{closure}}::hf7c2216e9836a06f
[INFO] [stdout]                                at /opt/rustwide/workdir/src/exercise/error/errors5.rs:32:10
[INFO] [stdout]   23:     0x5fa36747b296 - core::ops::function::FnOnce::call_once::h647d71572b630ff1
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/ops/function.rs:253:5
[INFO] [stdout]   24:     0x5fa36751df5b - core::ops::function::FnOnce::call_once::h1f9474f1347fff52
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/ops/function.rs:253:5
[INFO] [stdout]   25:     0x5fa36751df5b - test::__rust_begin_short_backtrace::ha52ab26e77157f03
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/test/src/lib.rs:648:18
[INFO] [stdout]   26:     0x5fa36751d095 - test::run_test_in_process::{{closure}}::h229c1a11a50b261f
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/test/src/lib.rs:671:74
[INFO] [stdout]   27:     0x5fa36751d095 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h78821afbf97b39a9
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stdout]   28:     0x5fa36751d095 - std::panicking::catch_unwind::do_call::h53abf3ed5bd32ba3
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/panicking.rs:589:40
[INFO] [stdout]   29:     0x5fa36751d095 - std::panicking::catch_unwind::h6deb5fe1e91873c9
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/panicking.rs:552:19
[INFO] [stdout]   30:     0x5fa36751d095 - std::panic::catch_unwind::hea0829b6b565654b
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/panic.rs:359:14
[INFO] [stdout]   31:     0x5fa36751d095 - test::run_test_in_process::hdc44dfecea3db21b
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/test/src/lib.rs:671:27
[INFO] [stdout]   32:     0x5fa36751d095 - test::run_test::{{closure}}::h0364ba59bf23f652
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/test/src/lib.rs:592:43
[INFO] [stdout]   33:     0x5fa3674e0c94 - test::run_test::{{closure}}::h32730b304eec05da
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/test/src/lib.rs:622:41
[INFO] [stdout]   34:     0x5fa3674e0c94 - std::sys::backtrace::__rust_begin_short_backtrace::h177cb952fc54ad2c
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/sys/backtrace.rs:158:18
[INFO] [stdout]   35:     0x5fa3674e466a - std::thread::Builder::spawn_unchecked_::{{closure}}::{{closure}}::h119d903520007597
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/thread/mod.rs:559:17
[INFO] [stdout]   36:     0x5fa3674e466a - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::hab88401d606702a6
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stdout]   37:     0x5fa3674e466a - std::panicking::catch_unwind::do_call::h163fe12cca9901c2
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/panicking.rs:589:40
[INFO] [stdout]   38:     0x5fa3674e466a - std::panicking::catch_unwind::he81557d0e17cc1bc
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/panicking.rs:552:19
[INFO] [stdout]   39:     0x5fa3674e466a - std::panic::catch_unwind::hc2b8e79c20593955
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/panic.rs:359:14
[INFO] [stdout]   40:     0x5fa3674e466a - std::thread::Builder::spawn_unchecked_::{{closure}}::hfa6b4978e07815cc
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/thread/mod.rs:557:30
[INFO] [stdout]   41:     0x5fa3674e466a - core::ops::function::FnOnce::call_once{{vtable.shim}}::hddcd7484a13fd793
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/ops/function.rs:253:5
[INFO] [stdout]   42:     0x5fa367600c2f - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h5924238c754de3b8
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/alloc/src/boxed.rs:1971:9
[INFO] [stdout]   43:     0x5fa367600c2f - std::sys::pal::unix::thread::Thread::new::thread_start::hb6e99e73da4d28f8
[INFO] [stdout]                                at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/sys/pal/unix/thread.rs:107:17
[INFO] [stdout]   44:     0x774c7947eaa4 - <unknown>
[INFO] [stdout]   45:     0x774c7950ba34 - clone
[INFO] [stdout]   46:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     exercise::error::errors5::test
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 150 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 5.03s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "44d6f9263efd96914cef26b21d704eaa8eb51f8b1a80db7441d56673397339a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "44d6f9263efd96914cef26b21d704eaa8eb51f8b1a80db7441d56673397339a8", kill_on_drop: false }`
[INFO] [stdout] 44d6f9263efd96914cef26b21d704eaa8eb51f8b1a80db7441d56673397339a8
