[INFO] cloning repository https://github.com/donggeuri0320/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/donggeuri0320/rust_study" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdonggeuri0320%2Frust_study", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdonggeuri0320%2Frust_study'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4eed30495a8a61cb34af54bf681dc6dca1a94332
[INFO] testing donggeuri0320/rust_study against 1.59.0 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdonggeuri0320%2Frust_study" "/workspace/builds/worker-43/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-43/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/donggeuri0320/rust_study on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-43/source/.cargo/config
[INFO] started tweaking git repo https://github.com/donggeuri0320/rust_study
[INFO] finished tweaking git repo https://github.com/donggeuri0320/rust_study
[INFO] tweaked toml for git repo https://github.com/donggeuri0320/rust_study written to /workspace/builds/worker-43/source/Cargo.toml
[INFO] crate git repo https://github.com/donggeuri0320/rust_study already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-43/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-43/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] df9b3f5c9cdc457bf5000045cd3b01a53e544b026936aec003303a97c626ab86
[INFO] running `Command { std: "docker" "start" "-a" "df9b3f5c9cdc457bf5000045cd3b01a53e544b026936aec003303a97c626ab86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "df9b3f5c9cdc457bf5000045cd3b01a53e544b026936aec003303a97c626ab86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "df9b3f5c9cdc457bf5000045cd3b01a53e544b026936aec003303a97c626ab86", kill_on_drop: false }`
[INFO] [stdout] df9b3f5c9cdc457bf5000045cd3b01a53e544b026936aec003303a97c626ab86
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-43/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-43/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3424832f0a48f4139e7144aa1a7f5982d1b4fd0785ded35b2c6f71347cd300a9
[INFO] running `Command { std: "docker" "start" "-a" "3424832f0a48f4139e7144aa1a7f5982d1b4fd0785ded35b2c6f71347cd300a9", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.103
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]    Compiling parking_lot_core v0.8.5
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling smallvec v1.7.0
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling bytes v1.1.0
[INFO] [stderr]    Compiling pin-project-lite v0.2.7
[INFO] [stderr]    Compiling once_cell v1.8.0
[INFO] [stderr]    Compiling tokio v1.12.0
[INFO] [stderr]    Compiling instant v0.1.11
[INFO] [stderr]    Compiling lock_api v0.4.5
[INFO] [stderr]    Compiling signal-hook-registry v1.4.0
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling mio v0.7.13
[INFO] [stderr]    Compiling parking_lot v0.11.2
[INFO] [stderr]    Compiling tokio-macros v1.4.1
[INFO] [stderr]    Compiling rust_study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::sync::mpsc::channel`
[INFO] [stdout]  --> src/basic/index.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::sync::mpsc::channel;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]    --> src/basic/index.rs:573:5
[INFO] [stdout]     |
[INFO] [stdout] 573 | use std::rc::Rc;
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]   --> src/basic/index.rs:98:9
[INFO] [stdout]    |
[INFO] [stdout] 98 |     let len = hs_ref_borrow_calc_len(&s1); // 소유권을 넘기는 대신에 참조권한을 넘김! ( & 기호가 참조자 )
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]    --> src/basic/index.rs:106:13
[INFO] [stdout]     |
[INFO] [stdout] 106 |         let r1 = &mut s2;
[INFO] [stdout]     |             ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]    --> src/basic/index.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |     let r2 = &mut s2;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `user3`
[INFO] [stdout]    --> src/basic/index.rs:162:9
[INFO] [stdout]     |
[INFO] [stdout] 162 |     let user3 = User {
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]    --> src/basic/index.rs:168:9
[INFO] [stdout]     |
[INFO] [stdout] 168 |     let black = Color(0, 0, 0); // 튜플 구조체 사용방법!
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_black`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rect2`
[INFO] [stdout]    --> src/basic/index.rs:194:9
[INFO] [stdout]     |
[INFO] [stdout] 194 |     let rect2 = Rectangle::square(3);
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_rect2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `lv`
[INFO] [stdout]    --> src/basic/index.rs:237:9
[INFO] [stdout]     |
[INFO] [stdout] 237 |     let lv = i.level();
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_lv`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/basic/index.rs:252:28
[INFO] [stdout]     |
[INFO] [stdout] 252 | fn longest<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout]     |                            ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]    --> src/basic/index.rs:544:9
[INFO] [stdout]     |
[INFO] [stdout] 544 |     let list = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil))))));
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> src/basic/index.rs:563:9
[INFO] [stdout]     |
[INFO] [stdout] 563 |     let c = CustomSmartPointer {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]    --> src/basic/index.rs:566:9
[INFO] [stdout]     |
[INFO] [stdout] 566 |     let d = CustomSmartPointer {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]    --> src/basic/index.rs:146:5
[INFO] [stdout]     |
[INFO] [stdout] 146 |     username: String,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sign_in_count`
[INFO] [stdout]    --> src/basic/index.rs:148:5
[INFO] [stdout]     |
[INFO] [stdout] 148 |     sign_in_count: u64,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]    --> src/basic/index.rs:149:5
[INFO] [stdout]     |
[INFO] [stdout] 149 |     active: bool,
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]    --> src/basic/index.rs:210:8
[INFO] [stdout]     |
[INFO] [stdout] 210 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `part`
[INFO] [stdout]    --> src/basic/index.rs:261:5
[INFO] [stdout]     |
[INFO] [stdout] 261 |     part: &'a str,
[INFO] [stdout]     |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `announce_and_return_part`
[INFO] [stdout]    --> src/basic/index.rs:274:8
[INFO] [stdout]     |
[INFO] [stdout] 274 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `loopBreak` should have a snake case name
[INFO] [stdout]   --> src/basic/index.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let mut loopBreak = 2;
[INFO] [stdout]    |             ^^^^^^^^^ help: convert the identifier to snake case: `loop_break`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `whileBreak` should have a snake case name
[INFO] [stdout]   --> src/basic/index.rs:78:13
[INFO] [stdout]    |
[INFO] [stdout] 78 |     let mut whileBreak = 2;
[INFO] [stdout]    |             ^^^^^^^^^^ help: convert the identifier to snake case: `while_break`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 21 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `hs_closures1`, `hs_closures`, `hs_index`, `hs_smart_pointer2`, `hs_smart_pointer3`, `hs_smart_pointer`, `hs_thread1`, `hs_thread2`, `hs_thread3`, `hs_thread4`, `hs_thread5`, `hs_thread6`, `hs_thread`
[INFO] [stdout]  --> src/main.rs:1:32
[INFO] [stdout]   |
[INFO] [stdout] 1 | ...::{hs_index, hs_closures, hs_closures1, hs_thread, hs_thread1, hs_thread2, hs_thread3, hs_thread4, hs_thread5, hs_thread6, hs_smart_pointer, hs_smart_pointer2, hs_smart_pointer3, h...
[INFO] [stdout]   |       ^^^^^^^^  ^^^^^^^^^^^  ^^^^^^^^^^^^  ^^^^^^^^^  ^^^^^^^^^^  ^^^^^^^^^^  ^^^^^^^^^^  ^^^^^^^^^^  ^^^^^^^^^^  ^^^^^^^^^^  ^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `worker`
[INFO] [stdout]   --> src/main.rs:25:10
[INFO] [stdout]    |
[INFO] [stdout] 25 | async fn worker() {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 26s
[INFO] running `Command { std: "docker" "inspect" "3424832f0a48f4139e7144aa1a7f5982d1b4fd0785ded35b2c6f71347cd300a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3424832f0a48f4139e7144aa1a7f5982d1b4fd0785ded35b2c6f71347cd300a9", kill_on_drop: false }`
[INFO] [stdout] 3424832f0a48f4139e7144aa1a7f5982d1b4fd0785ded35b2c6f71347cd300a9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-43/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-43/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4bc703b5446108466545518f7a4fb11cda73d1e9c54f007ffee12f86cf90e455
[INFO] running `Command { std: "docker" "start" "-a" "4bc703b5446108466545518f7a4fb11cda73d1e9c54f007ffee12f86cf90e455", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::sync::mpsc::channel`
[INFO] [stdout]  --> src/basic/index.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::sync::mpsc::channel;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]    --> src/basic/index.rs:573:5
[INFO] [stdout]     |
[INFO] [stdout] 573 | use std::rc::Rc;
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]   --> src/basic/index.rs:98:9
[INFO] [stdout]    |
[INFO] [stdout] 98 |     let len = hs_ref_borrow_calc_len(&s1); // 소유권을 넘기는 대신에 참조권한을 넘김! ( & 기호가 참조자 )
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]    --> src/basic/index.rs:106:13
[INFO] [stdout]     |
[INFO] [stdout] 106 |         let r1 = &mut s2;
[INFO] [stdout]     |             ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]    --> src/basic/index.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |     let r2 = &mut s2;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `user3`
[INFO] [stdout]    --> src/basic/index.rs:162:9
[INFO] [stdout]     |
[INFO] [stdout] 162 |     let user3 = User {
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]    --> src/basic/index.rs:168:9
[INFO] [stdout]     |
[INFO] [stdout] 168 |     let black = Color(0, 0, 0); // 튜플 구조체 사용방법!
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_black`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rect2`
[INFO] [stdout]    --> src/basic/index.rs:194:9
[INFO] [stdout]     |
[INFO] [stdout] 194 |     let rect2 = Rectangle::square(3);
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_rect2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `lv`
[INFO] [stdout]    --> src/basic/index.rs:237:9
[INFO] [stdout]     |
[INFO] [stdout] 237 |     let lv = i.level();
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_lv`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/basic/index.rs:252:28
[INFO] [stdout]     |
[INFO] [stdout] 252 | fn longest<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout]     |                            ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]    --> src/basic/index.rs:544:9
[INFO] [stdout]     |
[INFO] [stdout] 544 |     let list = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil))))));
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> src/basic/index.rs:563:9
[INFO] [stdout]     |
[INFO] [stdout] 563 |     let c = CustomSmartPointer {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]    --> src/basic/index.rs:566:9
[INFO] [stdout]     |
[INFO] [stdout] 566 |     let d = CustomSmartPointer {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]    --> src/basic/index.rs:146:5
[INFO] [stdout]     |
[INFO] [stdout] 146 |     username: String,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sign_in_count`
[INFO] [stdout]    --> src/basic/index.rs:148:5
[INFO] [stdout]     |
[INFO] [stdout] 148 |     sign_in_count: u64,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]    --> src/basic/index.rs:149:5
[INFO] [stdout]     |
[INFO] [stdout] 149 |     active: bool,
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]    --> src/basic/index.rs:210:8
[INFO] [stdout]     |
[INFO] [stdout] 210 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `part`
[INFO] [stdout]    --> src/basic/index.rs:261:5
[INFO] [stdout]     |
[INFO] [stdout] 261 |     part: &'a str,
[INFO] [stdout]     |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `announce_and_return_part`
[INFO] [stdout]    --> src/basic/index.rs:274:8
[INFO] [stdout]     |
[INFO] [stdout] 274 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `loopBreak` should have a snake case name
[INFO] [stdout]   --> src/basic/index.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let mut loopBreak = 2;
[INFO] [stdout]    |             ^^^^^^^^^ help: convert the identifier to snake case: `loop_break`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `whileBreak` should have a snake case name
[INFO] [stdout]   --> src/basic/index.rs:78:13
[INFO] [stdout]    |
[INFO] [stdout] 78 |     let mut whileBreak = 2;
[INFO] [stdout]    |             ^^^^^^^^^^ help: convert the identifier to snake case: `while_break`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 21 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `hs_closures1`, `hs_closures`, `hs_index`, `hs_smart_pointer2`, `hs_smart_pointer3`, `hs_smart_pointer`, `hs_thread1`, `hs_thread2`, `hs_thread3`, `hs_thread4`, `hs_thread5`, `hs_thread6`, `hs_thread`
[INFO] [stdout]  --> src/main.rs:1:32
[INFO] [stdout]   |
[INFO] [stdout] 1 | ...::{hs_index, hs_closures, hs_closures1, hs_thread, hs_thread1, hs_thread2, hs_thread3, hs_thread4, hs_thread5, hs_thread6, hs_smart_pointer, hs_smart_pointer2, hs_smart_pointer3, h...
[INFO] [stdout]   |       ^^^^^^^^  ^^^^^^^^^^^  ^^^^^^^^^^^^  ^^^^^^^^^  ^^^^^^^^^^  ^^^^^^^^^^  ^^^^^^^^^^  ^^^^^^^^^^  ^^^^^^^^^^  ^^^^^^^^^^  ^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `worker`
[INFO] [stdout]   --> src/main.rs:25:10
[INFO] [stdout]    |
[INFO] [stdout] 25 | async fn worker() {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::mpsc::channel`
[INFO] [stdout]  --> src/basic/index.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::sync::mpsc::channel;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]    --> src/basic/index.rs:573:5
[INFO] [stdout]     |
[INFO] [stdout] 573 | use std::rc::Rc;
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]   --> src/basic/index.rs:98:9
[INFO] [stdout]    |
[INFO] [stdout] 98 |     let len = hs_ref_borrow_calc_len(&s1); // 소유권을 넘기는 대신에 참조권한을 넘김! ( & 기호가 참조자 )
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]    --> src/basic/index.rs:106:13
[INFO] [stdout]     |
[INFO] [stdout] 106 |         let r1 = &mut s2;
[INFO] [stdout]     |             ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]    --> src/basic/index.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |     let r2 = &mut s2;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `user3`
[INFO] [stdout]    --> src/basic/index.rs:162:9
[INFO] [stdout]     |
[INFO] [stdout] 162 |     let user3 = User {
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]    --> src/basic/index.rs:168:9
[INFO] [stdout]     |
[INFO] [stdout] 168 |     let black = Color(0, 0, 0); // 튜플 구조체 사용방법!
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_black`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rect2`
[INFO] [stdout]    --> src/basic/index.rs:194:9
[INFO] [stdout]     |
[INFO] [stdout] 194 |     let rect2 = Rectangle::square(3);
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_rect2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `lv`
[INFO] [stdout]    --> src/basic/index.rs:237:9
[INFO] [stdout]     |
[INFO] [stdout] 237 |     let lv = i.level();
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_lv`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/basic/index.rs:252:28
[INFO] [stdout]     |
[INFO] [stdout] 252 | fn longest<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout]     |                            ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]    --> src/basic/index.rs:544:9
[INFO] [stdout]     |
[INFO] [stdout] 544 |     let list = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil))))));
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> src/basic/index.rs:563:9
[INFO] [stdout]     |
[INFO] [stdout] 563 |     let c = CustomSmartPointer {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]    --> src/basic/index.rs:566:9
[INFO] [stdout]     |
[INFO] [stdout] 566 |     let d = CustomSmartPointer {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]    --> src/basic/index.rs:146:5
[INFO] [stdout]     |
[INFO] [stdout] 146 |     username: String,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sign_in_count`
[INFO] [stdout]    --> src/basic/index.rs:148:5
[INFO] [stdout]     |
[INFO] [stdout] 148 |     sign_in_count: u64,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]    --> src/basic/index.rs:149:5
[INFO] [stdout]     |
[INFO] [stdout] 149 |     active: bool,
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]    --> src/basic/index.rs:210:8
[INFO] [stdout]     |
[INFO] [stdout] 210 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `part`
[INFO] [stdout]    --> src/basic/index.rs:261:5
[INFO] [stdout]     |
[INFO] [stdout] 261 |     part: &'a str,
[INFO] [stdout]     |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `announce_and_return_part`
[INFO] [stdout]    --> src/basic/index.rs:274:8
[INFO] [stdout]     |
[INFO] [stdout] 274 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `loopBreak` should have a snake case name
[INFO] [stdout]   --> src/basic/index.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let mut loopBreak = 2;
[INFO] [stdout]    |             ^^^^^^^^^ help: convert the identifier to snake case: `loop_break`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `whileBreak` should have a snake case name
[INFO] [stdout]   --> src/basic/index.rs:78:13
[INFO] [stdout]    |
[INFO] [stdout] 78 |     let mut whileBreak = 2;
[INFO] [stdout]    |             ^^^^^^^^^^ help: convert the identifier to snake case: `while_break`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 21 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.73s
[INFO] running `Command { std: "docker" "inspect" "4bc703b5446108466545518f7a4fb11cda73d1e9c54f007ffee12f86cf90e455", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4bc703b5446108466545518f7a4fb11cda73d1e9c54f007ffee12f86cf90e455", kill_on_drop: false }`
[INFO] [stdout] 4bc703b5446108466545518f7a4fb11cda73d1e9c54f007ffee12f86cf90e455
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-43/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-43/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 49b3d4ced7996406303e1f46ac3c95746f03505d882c118f81d2865d47b4afe0
[INFO] running `Command { std: "docker" "start" "-a" "49b3d4ced7996406303e1f46ac3c95746f03505d882c118f81d2865d47b4afe0", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: unused import: `std::sync::mpsc::channel`
[INFO] [stderr]  --> src/basic/index.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::sync::mpsc::channel;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::rc::Rc`
[INFO] [stderr]    --> src/basic/index.rs:573:5
[INFO] [stderr]     |
[INFO] [stderr] 573 | use std::rc::Rc;
[INFO] [stderr]     |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `len`
[INFO] [stderr]   --> src/basic/index.rs:98:9
[INFO] [stderr]    |
[INFO] [stderr] 98 |     let len = hs_ref_borrow_calc_len(&s1); // 소유권을 넘기는 대신에 참조권한을 넘김! ( & 기호가 참조자 )
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stderr]    --> src/basic/index.rs:106:13
[INFO] [stderr]     |
[INFO] [stderr] 106 |         let r1 = &mut s2;
[INFO] [stderr]     |             ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r2`
[INFO] [stderr]    --> src/basic/index.rs:108:9
[INFO] [stderr]     |
[INFO] [stderr] 108 |     let r2 = &mut s2;
[INFO] [stderr]     |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user3`
[INFO] [stderr]    --> src/basic/index.rs:162:9
[INFO] [stderr]     |
[INFO] [stderr] 162 |     let user3 = User {
[INFO] [stderr]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user3`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `black`
[INFO] [stderr]    --> src/basic/index.rs:168:9
[INFO] [stderr]     |
[INFO] [stderr] 168 |     let black = Color(0, 0, 0); // 튜플 구조체 사용방법!
[INFO] [stderr]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_black`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rect2`
[INFO] [stderr]    --> src/basic/index.rs:194:9
[INFO] [stderr]     |
[INFO] [stderr] 194 |     let rect2 = Rectangle::square(3);
[INFO] [stderr]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_rect2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `lv`
[INFO] [stderr]    --> src/basic/index.rs:237:9
[INFO] [stderr]     |
[INFO] [stderr] 237 |     let lv = i.level();
[INFO] [stderr]     |         ^^ help: if this is intentional, prefix it with an underscore: `_lv`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]    --> src/basic/index.rs:252:28
[INFO] [stderr]     |
[INFO] [stderr] 252 | fn longest<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stderr]     |                            ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `list`
[INFO] [stderr]    --> src/basic/index.rs:544:9
[INFO] [stderr]     |
[INFO] [stderr] 544 |     let list = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil))))));
[INFO] [stderr]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]    --> src/basic/index.rs:563:9
[INFO] [stderr]     |
[INFO] [stderr] 563 |     let c = CustomSmartPointer {
[INFO] [stderr]     |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `d`
[INFO] [stderr]    --> src/basic/index.rs:566:9
[INFO] [stderr]     |
[INFO] [stderr] 566 |     let d = CustomSmartPointer {
[INFO] [stderr]     |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `username`
[INFO] [stderr]    --> src/basic/index.rs:146:5
[INFO] [stderr]     |
[INFO] [stderr] 146 |     username: String,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `sign_in_count`
[INFO] [stderr]    --> src/basic/index.rs:148:5
[INFO] [stderr]     |
[INFO] [stderr] 148 |     sign_in_count: u64,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `active`
[INFO] [stderr]    --> src/basic/index.rs:149:5
[INFO] [stderr]     |
[INFO] [stderr] 149 |     active: bool,
[INFO] [stderr]     |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `can_hold`
[INFO] [stderr]    --> src/basic/index.rs:210:8
[INFO] [stderr]     |
[INFO] [stderr] 210 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stderr]     |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `part`
[INFO] [stderr]    --> src/basic/index.rs:261:5
[INFO] [stderr]     |
[INFO] [stderr] 261 |     part: &'a str,
[INFO] [stderr]     |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `announce_and_return_part`
[INFO] [stderr]    --> src/basic/index.rs:274:8
[INFO] [stderr]     |
[INFO] [stderr] 274 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable `loopBreak` should have a snake case name
[INFO] [stderr]   --> src/basic/index.rs:69:13
[INFO] [stderr]    |
[INFO] [stderr] 69 |     let mut loopBreak = 2;
[INFO] [stderr]    |             ^^^^^^^^^ help: convert the identifier to snake case: `loop_break`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `whileBreak` should have a snake case name
[INFO] [stderr]   --> src/basic/index.rs:78:13
[INFO] [stderr]    |
[INFO] [stderr] 78 |     let mut whileBreak = 2;
[INFO] [stderr]    |             ^^^^^^^^^^ help: convert the identifier to snake case: `while_break`
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_study` (lib) generated 21 warnings
[INFO] [stderr] warning: `rust_study` (lib test) generated 21 warnings (21 duplicates)
[INFO] [stderr] warning: unused imports: `hs_closures1`, `hs_closures`, `hs_index`, `hs_smart_pointer2`, `hs_smart_pointer3`, `hs_smart_pointer`, `hs_thread1`, `hs_thread2`, `hs_thread3`, `hs_thread4`, `hs_thread5`, `hs_thread6`, `hs_thread`
[INFO] [stderr]  --> src/main.rs:1:32
[INFO] [stderr]   |
[INFO] [stderr] 1 | ...::{hs_index, hs_closures, hs_closures1, hs_thread, hs_thread1, hs_thread2, hs_thread3, hs_thread4, hs_thread5, hs_thread6, hs_smart_pointer, hs_smart_pointer2, hs_smart_pointer3, h...
[INFO] [stderr]   |       ^^^^^^^^  ^^^^^^^^^^^  ^^^^^^^^^^^^  ^^^^^^^^^  ^^^^^^^^^^  ^^^^^^^^^^  ^^^^^^^^^^  ^^^^^^^^^^  ^^^^^^^^^^  ^^^^^^^^^^  ^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `worker`
[INFO] [stderr]   --> src/main.rs:25:10
[INFO] [stderr]    |
[INFO] [stderr] 25 | async fn worker() {
[INFO] [stderr]    |          ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_study` (bin "rust_study" test) generated 2 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_study-5345f1cff09e211d)
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_study-2285e58e6490c67a)
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests rust_study
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "49b3d4ced7996406303e1f46ac3c95746f03505d882c118f81d2865d47b4afe0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "49b3d4ced7996406303e1f46ac3c95746f03505d882c118f81d2865d47b4afe0", kill_on_drop: false }`
[INFO] [stdout] 49b3d4ced7996406303e1f46ac3c95746f03505d882c118f81d2865d47b4afe0