[INFO] cloning repository https://github.com/lafer-m/rust-practice
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lafer-m/rust-practice" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flafer-m%2Frust-practice", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flafer-m%2Frust-practice'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5e9ed63702f92c67c93c47f16a37dee7c775d690
[INFO] checking lafer-m/rust-practice against try#6619027b13a87a3597115f2c8231f107bf3a7a5f for pr-139624
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flafer-m%2Frust-practice" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lafer-m/rust-practice on toolchain 6619027b13a87a3597115f2c8231f107bf3a7a5f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6619027b13a87a3597115f2c8231f107bf3a7a5f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/lafer-m/rust-practice
[INFO] finished tweaking git repo https://github.com/lafer-m/rust-practice
[INFO] tweaked toml for git repo https://github.com/lafer-m/rust-practice written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/lafer-m/rust-practice 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" "+6619027b13a87a3597115f2c8231f107bf3a7a5f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking lafer-m/rust-practice against try#6619027b13a87a3597115f2c8231f107bf3a7a5f for pr-139624
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flafer-m%2Frust-practice" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lafer-m/rust-practice on toolchain 6619027b13a87a3597115f2c8231f107bf3a7a5f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6619027b13a87a3597115f2c8231f107bf3a7a5f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/lafer-m/rust-practice
[INFO] finished tweaking git repo https://github.com/lafer-m/rust-practice
[INFO] tweaked toml for git repo https://github.com/lafer-m/rust-practice written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/lafer-m/rust-practice 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" "+6619027b13a87a3597115f2c8231f107bf3a7a5f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded libc v0.2.118
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+6619027b13a87a3597115f2c8231f107bf3a7a5f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+6619027b13a87a3597115f2c8231f107bf3a7a5f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c6827a2f0074282efeac64a473d878d9559afc5e06da4a2ce1a85866346086f7
[INFO] running `Command { std: "docker" "start" "-a" "c6827a2f0074282efeac64a473d878d9559afc5e06da4a2ce1a85866346086f7", kill_on_drop: false }`
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[INFO] [stderr]    Compiling proc-macro2 v1.0.66
[INFO] [stderr]    Compiling syn v1.0.89
[INFO] [stderr]    Compiling log v0.4.16
[INFO] [stderr]    Compiling parking_lot_core v0.9.2
[INFO] [stderr]    Compiling serde v1.0.185
[INFO] [stderr]     Checking smallvec v1.8.0
[INFO] [stderr]    Compiling heck v0.4.0
[INFO] [stderr]    Compiling serde_json v1.0.105
[INFO] [stderr]    Compiling lock_api v0.4.7
[INFO] [stderr]    Compiling indexmap v1.8.0
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[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]     Checking getrandom v0.2.4
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[INFO] [stderr]    Compiling serde_derive v1.0.185
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking regex v1.9.1
[INFO] [stderr]    Compiling tokio-macros v1.7.0
[INFO] [stderr]    Compiling clap_derive v3.1.4
[INFO] [stderr]     Checking tokio v1.17.0
[INFO] [stderr]     Checking clap v3.1.6
[INFO] [stderr]     Checking rust-practice v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: type `user` should have an upper camel case name
[INFO] [stdout]  --> src/datatypes/structa.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct user {
[INFO] [stdout]   |        ^^^^ help: convert the identifier to upper camel case (notice the capitalization): `User`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Cons` and `Nil`
[INFO] [stdout]   --> src/smartpointer/smart_pointer.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | use List::{Cons,Nil};
[INFO] [stdout]    |            ^^^^ ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem::drop`
[INFO] [stdout]  --> src/smartpointer/drop_trait.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::mem::drop;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Cons` and `Nil`
[INFO] [stdout]   --> src/smartpointer/rc_t_ref.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | use List::{Cons,Nil};
[INFO] [stdout]    |            ^^^^ ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]  --> src/concurrency/spawn_thread.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::thread;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::net::TcpListener`
[INFO] [stdout]  --> src/concurrency/tokio_work.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use tokio::net::TcpListener;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `AsyncBufReadExt` and `AsyncWriteExt`
[INFO] [stdout]  --> src/concurrency/tokio_work.rs:2:17
[INFO] [stdout]   |
[INFO] [stdout] 2 | use tokio::io::{AsyncBufReadExt,AsyncWriteExt};
[INFO] [stdout]   |                 ^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::Arc`
[INFO] [stdout]  --> src/concurrency/atomic.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::sync::Arc;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `user` should have an upper camel case name
[INFO] [stdout]  --> src/datatypes/structa.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct user {
[INFO] [stdout]   |        ^^^^ help: convert the identifier to upper camel case (notice the capitalization): `User`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::net::TcpListener`
[INFO] [stdout]  --> src/concurrency/tokio_work.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use tokio::net::TcpListener;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `AsyncBufReadExt` and `AsyncWriteExt`
[INFO] [stdout]  --> src/concurrency/tokio_work.rs:2:17
[INFO] [stdout]   |
[INFO] [stdout] 2 | use tokio::io::{AsyncBufReadExt,AsyncWriteExt};
[INFO] [stdout]   |                 ^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::Arc`
[INFO] [stdout]  --> src/concurrency/atomic.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::sync::Arc;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ops::Add`
[INFO] [stdout]  --> src/unsafely/unsafely.rs:8:18
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::{slice, ops::Add};
[INFO] [stdout]   |                  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/datatypes/array.rs:19:26
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn type_limit<T: ?Sized>(a: &T) {}
[INFO] [stdout]    |                          ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cx`
[INFO] [stdout]  --> src/concurrency/future.rs:8:35
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>  {
[INFO] [stdout]   |                                   ^^ help: if this is intentional, prefix it with an underscore: `_cx`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]   --> src/oop/state_change.rs:71:28
[INFO] [stdout]    |
[INFO] [stdout] 71 |     fn contents<'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: `post`
[INFO] [stdout]   --> src/oop/state_change.rs:84:28
[INFO] [stdout]    |
[INFO] [stdout] 84 |     fn contents<'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: function `test` is never used
[INFO] [stdout]   --> src/errors/errhandlers.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn test() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `readusername` is never used
[INFO] [stdout]   --> src/errors/errhandlers.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn readusername()  -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username` is never used
[INFO] [stdout]   --> src/errors/errhandlers.rs:39:4
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn read_username() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `handler_error` is never used
[INFO] [stdout]   --> src/errors/errhandlers.rs:50:4
[INFO] [stdout]    |
[INFO] [stdout] 50 | fn handler_error() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `type_limit` is never used
[INFO] [stdout]   --> src/datatypes/array.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn type_limit<T: ?Sized>(a: &T) {}
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `user` is never constructed
[INFO] [stdout]  --> src/datatypes/structa.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct user {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area` is never used
[INFO] [stdout]   --> src/datatypes/structa.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub fn area(angle: &Rectangle) -> u32 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `draw` is never used
[INFO] [stdout]   --> src/datatypes/trait_object.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub trait Draw {
[INFO] [stdout]    |           ---- method in this trait
[INFO] [stdout] 14 |     fn draw(&self); 
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Screen` is never constructed
[INFO] [stdout]   --> src/datatypes/trait_object.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub struct Screen {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `run` is never used
[INFO] [stdout]   --> src/datatypes/trait_object.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl Screen {
[INFO] [stdout]    | ----------- method in this implementation
[INFO] [stdout] 23 |     pub fn run(&self) {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `a` and `b` are never read
[INFO] [stdout]   --> src/datatypes/trait_object.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub struct Button {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 32 |     a: u32,
[INFO] [stdout]    |     ^
[INFO] [stdout] 33 |     b: u32,
[INFO] [stdout]    |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `a` and `b` are never read
[INFO] [stdout]   --> src/datatypes/trait_object.rs:43:5
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub struct Select {   // impl Draw trait
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 43 |     a: u8,
[INFO] [stdout]    |     ^
[INFO] [stdout] 44 |     b: i8,
[INFO] [stdout]    |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cacher` is never constructed
[INFO] [stdout]  --> src/closure/cacher.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Cacher<T>
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Shoe` is never constructed
[INFO] [stdout]   --> src/closure/iterator.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct Shoe {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_shoe_size` is never used
[INFO] [stdout]   --> src/closure/iterator.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn find_shoe_size(shoes: Vec<Shoe>, size: u32) -> Vec<Shoe> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Counter` is never constructed
[INFO] [stdout]  --> src/closure/iterator_self_define.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Counter {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]  --> src/closure/iterator_self_define.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl Counter {
[INFO] [stdout]   | ------------ associated function in this implementation
[INFO] [stdout] 7 |     fn new() ->Counter {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]  --> src/smartpointer/smart_pointer.rs:5:6
[INFO] [stdout]   |
[INFO] [stdout] 5 | enum List {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Mybox` is never constructed
[INFO] [stdout]  --> src/smartpointer/deref_trait.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Mybox<T>(T);
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]  --> src/smartpointer/deref_trait.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | impl <T> Mybox<T> {
[INFO] [stdout]   | ----------------- associated function in this implementation
[INFO] [stdout] 6 |     fn new(v: T) -> Mybox<T> {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hello` is never used
[INFO] [stdout]   --> src/smartpointer/deref_trait.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn hello(s: &str) {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Custom` is never constructed
[INFO] [stdout]  --> src/smartpointer/drop_trait.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Custom {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]  --> src/smartpointer/rc_t_ref.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum List {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Mutex` is never constructed
[INFO] [stdout]   --> src/concurrency/atomic.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Mutex {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `lock`, and `unlock` are never used
[INFO] [stdout]   --> src/concurrency/atomic.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl Mutex {
[INFO] [stdout]    | ---------- associated items in this implementation
[INFO] [stdout] 17 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     fn lock(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     fn unlock(&self) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lock_test` is never used
[INFO] [stdout]   --> src/concurrency/atomic.rs:54:10
[INFO] [stdout]    |
[INFO] [stdout] 54 | async fn lock_test(
[INFO] [stdout]    |          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Post` is never constructed
[INFO] [stdout]   --> src/oop/state_change.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub struct Post {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add_text`, `request_review`, `approve`, and `contents` are never used
[INFO] [stdout]   --> src/oop/state_change.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 27 | impl Post {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 28 |     pub fn new() -> Post {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 34 |     pub fn add_text(&mut self,s: &str) {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 37 |     pub fn request_review(&mut self) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 42 |     pub fn approve(&mut self) {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 48 |     pub fn contents(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `State` is never used
[INFO] [stdout]   --> src/oop/state_change.rs:56:7
[INFO] [stdout]    |
[INFO] [stdout] 56 | trait State {
[INFO] [stdout]    |       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Draft` is never constructed
[INFO] [stdout]   --> src/oop/state_change.rs:63:8
[INFO] [stdout]    |
[INFO] [stdout] 63 | struct Draft {}
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Review` is never constructed
[INFO] [stdout]   --> src/oop/state_change.rs:76:8
[INFO] [stdout]    |
[INFO] [stdout] 76 | struct Review {}
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Published` is never constructed
[INFO] [stdout]   --> src/oop/state_change.rs:90:8
[INFO] [stdout]    |
[INFO] [stdout] 90 | struct Published {}
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `split_slice` is never used
[INFO] [stdout]   --> src/unsafely/unsafely.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn split_slice(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `unsafefunc` is never used
[INFO] [stdout]   --> src/unsafely/unsafely.rs:38:11
[INFO] [stdout]    |
[INFO] [stdout] 38 | unsafe fn unsafefunc() {}
[INFO] [stdout]    |           ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `opt_t` is never used
[INFO] [stdout]   --> src/macros/macrose.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn opt_t() -> Option<u16> {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ops::Add`
[INFO] [stdout]  --> src/unsafely/unsafely.rs:8:18
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::{slice, ops::Add};
[INFO] [stdout]   |                  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/datatypes/array.rs:19:26
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn type_limit<T: ?Sized>(a: &T) {}
[INFO] [stdout]    |                          ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/smartpointer/rc_t_ref.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let b = Rc::new(Cons(0, Rc::clone(&a)));        // Rc::clone only increments the reference count, no deep-copy happened
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/smartpointer/rc_t_ref.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |         let c = Rc::new(Cons(-1, Rc::clone(&a)));
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cx`
[INFO] [stdout]  --> src/concurrency/future.rs:8:35
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>  {
[INFO] [stdout]   |                                   ^^ help: if this is intentional, prefix it with an underscore: `_cx`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Mutex`
[INFO] [stdout]  --> src/bin/iptries.rs:1:22
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::sync::{Arc, Mutex};
[INFO] [stdout]   |                      ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]   --> src/oop/state_change.rs:71:28
[INFO] [stdout]    |
[INFO] [stdout] 71 |     fn contents<'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: `post`
[INFO] [stdout]   --> src/oop/state_change.rs:84:28
[INFO] [stdout]    |
[INFO] [stdout] 84 |     fn contents<'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 import: `Mutex`
[INFO] [stdout]  --> src/bin/iptries.rs:1:22
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::sync::{Arc, Mutex};
[INFO] [stdout]   |                      ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test` is never used
[INFO] [stdout]   --> src/errors/errhandlers.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn test() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `readusername` is never used
[INFO] [stdout]   --> src/errors/errhandlers.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn readusername()  -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username` is never used
[INFO] [stdout]   --> src/errors/errhandlers.rs:39:4
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn read_username() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `user` is never constructed
[INFO] [stdout]  --> src/datatypes/structa.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct user {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area` is never used
[INFO] [stdout]   --> src/datatypes/structa.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub fn area(angle: &Rectangle) -> u32 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `a` and `b` are never read
[INFO] [stdout]   --> src/datatypes/trait_object.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub struct Button {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 32 |     a: u32,
[INFO] [stdout]    |     ^
[INFO] [stdout] 33 |     b: u32,
[INFO] [stdout]    |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `a` and `b` are never read
[INFO] [stdout]   --> src/datatypes/trait_object.rs:43:5
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub struct Select {   // impl Draw trait
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 43 |     a: u8,
[INFO] [stdout]    |     ^
[INFO] [stdout] 44 |     b: i8,
[INFO] [stdout]    |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cacher` is never constructed
[INFO] [stdout]  --> src/closure/cacher.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Cacher<T>
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> src/smartpointer/smart_pointer.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Cons(i32, Box<List>),
[INFO] [stdout]   |     ---- ^^^  ^^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields 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] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 6 -     Cons(i32, Box<List>),
[INFO] [stdout] 6 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> src/smartpointer/rc_t_ref.rs:5:10
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Cons(i32, Rc<List>),
[INFO] [stdout]   |     ---- ^^^  ^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields 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] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 5 -     Cons(i32, Rc<List>),
[INFO] [stdout] 5 +     Cons((), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]   --> src/concurrency/atomic.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Mutex {
[INFO] [stdout]    |        ----- field in this struct
[INFO] [stdout] 12 |     flag: AtomicBool,
[INFO] [stdout] 13 |     value: u32
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Mutex` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `split_slice` is never used
[INFO] [stdout]   --> src/unsafely/unsafely.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn split_slice(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `sizeShoes` should have a snake case name
[INFO] [stdout]   --> src/closure/iterator.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let sizeShoes = find_shoe_size(shoes, 10);
[INFO] [stdout]    |         ^^^^^^^^^ help: convert the identifier to snake case: `size_shoes`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: `RefCell<B>` cannot be shared between threads safely
[INFO] [stdout]   --> src/bin/iptries.rs:33:19
[INFO] [stdout]    |
[INFO] [stdout] 33 |       thread::spawn(move || {
[INFO] [stdout]    |  _____-------------_^
[INFO] [stdout]    | |     |
[INFO] [stdout]    | |     required by a bound introduced by this call
[INFO] [stdout] 34 | |         b_clone.borrow_mut().value = 70;
[INFO] [stdout] 35 | |     })
[INFO] [stdout]    | |_____^ `RefCell<B>` cannot be shared between threads safely
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `Sync` is not implemented for `RefCell<B>`
[INFO] [stdout]    = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` instead
[INFO] [stdout]    = note: required for `Arc<RefCell<B>>` to implement `Send`
[INFO] [stdout] note: required because it's used within this closure
[INFO] [stdout]   --> src/bin/iptries.rs:33:19
[INFO] [stdout]    |
[INFO] [stdout] 33 |     thread::spawn(move || {
[INFO] [stdout]    |                   ^^^^^^^
[INFO] [stdout] note: required by a bound in `spawn`
[INFO] [stdout]   --> /rustc/6619027b13a87a3597115f2c8231f107bf3a7a5f/library/std/src/thread/mod.rs:723:1
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: `RefCell<B>` cannot be shared between threads safely
[INFO] [stdout]   --> src/bin/iptries.rs:33:19
[INFO] [stdout]    |
[INFO] [stdout] 33 |       thread::spawn(move || {
[INFO] [stdout]    |  _____-------------_^
[INFO] [stdout]    | |     |
[INFO] [stdout]    | |     required by a bound introduced by this call
[INFO] [stdout] 34 | |         b_clone.borrow_mut().value = 70;
[INFO] [stdout] 35 | |     })
[INFO] [stdout]    | |_____^ `RefCell<B>` cannot be shared between threads safely
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `Sync` is not implemented for `RefCell<B>`
[INFO] [stdout]    = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` instead
[INFO] [stdout]    = note: required for `Arc<RefCell<B>>` to implement `Send`
[INFO] [stdout] note: required because it's used within this closure
[INFO] [stdout]   --> src/bin/iptries.rs:33:19
[INFO] [stdout]    |
[INFO] [stdout] 33 |     thread::spawn(move || {
[INFO] [stdout]    |                   ^^^^^^^
[INFO] [stdout] note: required by a bound in `spawn`
[INFO] [stdout]   --> /rustc/6619027b13a87a3597115f2c8231f107bf3a7a5f/library/std/src/thread/mod.rs:723:1
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `input`
[INFO] [stdout]    --> src/bin/token.rs:162:24
[INFO] [stdout]     |
[INFO] [stdout] 162 | fn get_field_value<'a>(input: &'a str, field: &'a str) -> &'a str {
[INFO] [stdout]     |                        ^^^^^ help: if this is intentional, prefix it with an underscore: `_input`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-practice` (bin "iptries") due to 1 previous error; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `rust-practice` (bin "iptries" test) due to 1 previous error; 1 warning emitted
[INFO] [stdout] warning: unused variable: `input`
[INFO] [stdout]    --> src/bin/token.rs:162:24
[INFO] [stdout]     |
[INFO] [stdout] 162 | fn get_field_value<'a>(input: &'a str, field: &'a str) -> &'a str {
[INFO] [stdout]     |                        ^^^^^ help: if this is intentional, prefix it with an underscore: `_input`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "c6827a2f0074282efeac64a473d878d9559afc5e06da4a2ce1a85866346086f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6827a2f0074282efeac64a473d878d9559afc5e06da4a2ce1a85866346086f7", kill_on_drop: false }`
[INFO] [stdout] c6827a2f0074282efeac64a473d878d9559afc5e06da4a2ce1a85866346086f7