[INFO] cloning repository https://github.com/yaoliao/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/yaoliao/rust-study" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyaoliao%2Frust-study", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyaoliao%2Frust-study'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 916a70850556f642248b9fb99f45f61a1896f611
[INFO] testing yaoliao/rust-study against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyaoliao%2Frust-study" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/yaoliao/rust-study on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/yaoliao/rust-study
[INFO] finished tweaking git repo https://github.com/yaoliao/rust-study
[INFO] tweaked toml for git repo https://github.com/yaoliao/rust-study written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/yaoliao/rust-study already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2cf418658a647de769752f4063e3d7943705ee23572c9ea6d7cbf28624fc2aec
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "2cf418658a647de769752f4063e3d7943705ee23572c9ea6d7cbf28624fc2aec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2cf418658a647de769752f4063e3d7943705ee23572c9ea6d7cbf28624fc2aec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2cf418658a647de769752f4063e3d7943705ee23572c9ea6d7cbf28624fc2aec", kill_on_drop: false }`
[INFO] [stdout] 2cf418658a647de769752f4063e3d7943705ee23572c9ea6d7cbf28624fc2aec
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6d03a8d9dc7e545123058c01d6fda5c48a8463783225a3d7e48055323547412a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "6d03a8d9dc7e545123058c01d6fda5c48a8463783225a3d7e48055323547412a", kill_on_drop: false }`
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling gimli v0.23.0
[INFO] [stderr]    Compiling adler v0.2.3
[INFO] [stderr]    Compiling pin-utils v0.1.0
[INFO] [stderr]    Compiling futures-io-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling rustc-demangle v0.1.18
[INFO] [stderr]    Compiling object v0.22.0
[INFO] [stderr]    Compiling slab v0.4.2
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling smallvec v0.4.5
[INFO] [stderr]    Compiling miniz_oxide v0.4.3
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling time v0.1.44
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling futures-sink-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling rand v0.5.6
[INFO] [stderr]    Compiling futures-channel-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling addr2line v0.14.0
[INFO] [stderr]    Compiling backtrace v0.3.55
[INFO] [stderr]    Compiling futures-executor-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling futures-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling error-chain v0.10.0
[INFO] [stderr]    Compiling ferris-says v0.2.0
[INFO] [stderr]    Compiling rust-study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `soup`
[INFO] [stdout]   --> src/lib.rs:81:9
[INFO] [stdout]    |
[INFO] [stdout] 81 |     let soup = back_of_house::Appetizer::Soup;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_soup`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add`
[INFO] [stdout]  --> src/front_of_house.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 |     fn add() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `take_order`
[INFO] [stdout]   --> src/front_of_house.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 |         fn take_order() {}
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `server_order`
[INFO] [stdout]   --> src/front_of_house.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout] 13 |         fn server_order() {}
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `take_payment`
[INFO] [stdout]   --> src/front_of_house.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 |         fn take_payment() {}
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `serve_order`
[INFO] [stdout]   --> src/lib.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn serve_order() {}
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fix_incorrect_order`
[INFO] [stdout]   --> src/lib.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 |     fn fix_incorrect_order() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `cook_order`
[INFO] [stdout]   --> src/lib.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 |     fn cook_order() {}
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `seasonal_fruit`
[INFO] [stdout]   --> src/lib.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |         seasonal_fruit: String,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Salad`
[INFO] [stdout]   --> src/lib.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |         Salad,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/closure.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 |     /// 下面这段代码无法通过编译
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/closure.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     /// 因为使用了 [move] 导致 x 的所有权被转移到了 闭包[equal_to_x] 中
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]    |
[INFO] [stdout]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/closure.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     /// 当下一行想去输出 x 的时候已经无法获取到所有权了
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]    |
[INFO] [stdout]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]  --> src/unsafe_study/mod.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     /// 不安全的创建裸指针的方法
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]   |
[INFO] [stdout]   = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cmp::Ordering`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::cmp::Ordering;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::Rng`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use rand::Rng;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/string.rs:43:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | /     /// UTF-8编码时 一个汉字字符储存需要3到4个字节,所以 0.。1 运行会直接报错！！！！！！！
[INFO] [stdout] 44 | |     /// let c = &str[0..1];
[INFO] [stdout] 45 | |     /// println!("{}", c);
[INFO] [stdout]    | |__________________________^
[INFO] [stdout] 46 | 
[INFO] [stdout] 47 |       let chars = str.chars();
[INFO] [stdout]    |       ------------------------ rustdoc does not generate documentation for statements
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/collection.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | /     /// 获取了 vector 的第一个元素的不可变引用并尝试在 vector 末尾增加一个元素的时候，这是行不通的
[INFO] [stdout] 28 | |     /// let new_one = &vector[0];
[INFO] [stdout] 29 | |     /// vector.push(5);
[INFO] [stdout] 30 | |     /// println!("vec one :{}", new_one);
[INFO] [stdout]    | |_________________________________________^
[INFO] [stdout] 31 | 
[INFO] [stdout] 32 |       let num = vec![100, 233, 1232];
[INFO] [stdout]    |       ------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/map.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | /     /// u32 实现了 Copy trait 的类型，其值可以拷贝进哈希 map
[INFO] [stdout] 12 | |     /// 但是 String 的所有权会被转移到 map 中，
[INFO] [stdout] 13 | |     /// let mut map: HashMap<String, u32> = HashMap::new();
[INFO] [stdout] 14 | |     /// map.insert(jack, 23); // jack 的所有权已经被转移
[INFO] [stdout]    | |________________________________________________________^
[INFO] [stdout] ...
[INFO] [stdout] 17 |       let key = vec![String::from("Jack"), String::from("Rose")];
[INFO] [stdout]    |       ----------------------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/map.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     /// 必须使用 HashMap<_, _> 表明类型
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 20 |     let mut map: HashMap<_, _> = key.iter().zip(value.iter()).collect();
[INFO] [stdout]    |     -------------------------------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/map.rs:52:5
[INFO] [stdout]    |
[INFO] [stdout] 52 |     /// 根据旧值更新新值
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 53 |     let text = "hello world wonderful world";
[INFO] [stdout]    |     ----------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]   --> src/practice.rs:43:23
[INFO] [stdout]    |
[INFO] [stdout] 43 |     if len / 2 == 0 { (vec[len / 2 - 1] + vec[len / 2]) } else { vec[len / 2] }
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Display`
[INFO] [stdout]  --> src/trait_study.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::Display;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/trait_study.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | /     /// 返回错误，只有泛型为 f32 的才定义了这个方法
[INFO] [stdout] 12 | |     /// println!("distance_from_origin: {}", p.distance_from_origin());
[INFO] [stdout]    | |_______________________________________________________________________^
[INFO] [stdout] 13 |       let p = Point { x: 20.0, y: 30.0 };
[INFO] [stdout]    |       ----------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/closure.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | /     /// 闭包捕获环境
[INFO] [stdout] 21 | |     /// 如果你希望强制闭包获取其使用的环境值的所有权，可以在参数列表前使用 [move] 关键字
[INFO] [stdout] 22 | |     /// 类似：let equal_to_x = move |z| z == x;
[INFO] [stdout]    | |_______________________________________________^
[INFO] [stdout] 23 |       let x = 4;
[INFO] [stdout]    |       ---------- rustdoc does not generate documentation for statements
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ConsRc`, `NilRc`
[INFO] [stdout]  --> src/smart_pointer.rs:5:36
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::smart_pointer::ListRc::{ConsRc, NilRc};
[INFO] [stdout]   |                                    ^^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Arc`, `Mutex`, `mpsc`
[INFO] [stdout]  --> src/concurrent/thread_study.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::sync::{Arc, mpsc, Mutex};
[INFO] [stdout]   |                 ^^^  ^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Formatter`
[INFO] [stdout]  --> src/unsafe_study/mod.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::fmt::Formatter;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Point_v1` should have an upper camel case name
[INFO] [stdout]    --> src/unsafe_study/mod.rs:115:8
[INFO] [stdout]     |
[INFO] [stdout] 115 | struct Point_v1 {
[INFO] [stdout]     |        ^^^^^^^^ help: convert the identifier to upper camel case: `PointV1`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `time::Duration`
[INFO] [stdout]   --> src/asynchronous/timer/executor.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         time::Duration,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::asynchronous::timer::TimerFuture`
[INFO] [stdout]   --> src/asynchronous/timer/executor.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | use crate::asynchronous::timer::TimerFuture;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `SystemTime`
[INFO] [stdout]  --> src/asynchronous/mod.rs:6:27
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::time::{Duration, SystemTime};
[INFO] [stdout]   |                           ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `futures::executor::block_on`
[INFO] [stdout]  --> src/asynchronous/mod.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use futures::executor::block_on;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `some_str`
[INFO] [stdout]   --> src/main.rs:87:9
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let some_str = Some("hello");
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_str`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `none`
[INFO] [stdout]   --> src/main.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 88 |     let none: Option<u32> = None;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_none`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]    --> src/main.rs:105:9
[INFO] [stdout]     |
[INFO] [stdout] 105 |     let mut count = 0;
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_count` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/main.rs:108:14
[INFO] [stdout]     |
[INFO] [stdout] 108 |     } else { count += 1 }
[INFO] [stdout]     |              ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `tmp` is never read
[INFO] [stdout]    --> src/main.rs:133:9
[INFO] [stdout]     |
[INFO] [stdout] 133 |     let mut tmp = 0;
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:134:9
[INFO] [stdout]     |
[INFO] [stdout] 134 |     for i in 2..n + 1 {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `new_str`
[INFO] [stdout]  --> src/string.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let new_str = String::new();
[INFO] [stdout]   |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_new_str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> src/string.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let s = data.to_string();
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> src/string.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let s = "initial contents".to_string();
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> src/string.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let s = String::from("initial contents");
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/collection.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |         let v = vec![1, 2, 3];
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/collection.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |     let row = vec![
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]   --> src/practice.rs:26:19
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let (mut cnt, len, mut res) = (0, vec.len(), vec[0]);
[INFO] [stdout]    |                   ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let f = match f {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let f = match f {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let f = File::open("rust.txt").unwrap_or_else(|error| {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let f = File::open("rust.txt").unwrap();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let f = File::open("rust.txt").expect("can't open file rust.txt");
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]  --> src/smart_pointer.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let b = Box::new(5);
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f1`
[INFO] [stdout]   --> src/asynchronous/mod.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     let f1 = learn_and_sing();
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_f1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f2`
[INFO] [stdout]   --> src/asynchronous/mod.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let f2 = dance_async();
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_f2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/collection.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut vector = vec![1, 2, 3]; // 利用 vec! 宏 来创建
[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/iterator.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut v1_iter = v1.iter();
[INFO] [stdout]   |         ----^^^^^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `string_study`
[INFO] [stdout]  --> src/string.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn string_study() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `my_collection`
[INFO] [stdout]  --> src/collection.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn my_collection() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `SpreadsheetCell`
[INFO] [stdout]   --> src/collection.rs:54:6
[INFO] [stdout]    |
[INFO] [stdout] 54 | enum SpreadsheetCell {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `map_study`
[INFO] [stdout]  --> src/map.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn map_study() {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `bubble_sort`
[INFO] [stdout]   --> src/practice.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn bubble_sort(vec: &mut Vec<u32>) {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file_v1`
[INFO] [stdout]   --> src/error.rs:65:4
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn read_username_from_file_v1() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file_v2`
[INFO] [stdout]   --> src/error.rs:72:4
[INFO] [stdout]    |
[INFO] [stdout] 72 | fn read_username_from_file_v2() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify_t_d_where`
[INFO] [stdout]    --> src/trait_study.rs:149:4
[INFO] [stdout]     |
[INFO] [stdout] 149 | fn notify_t_d_where<T>(item: T)
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `grep`
[INFO] [stdout]  --> src/mini_grep.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn grep() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Config`
[INFO] [stdout]   --> src/mini_grep.rs:24:16
[INFO] [stdout]    |
[INFO] [stdout] 24 |     pub struct Config {
[INFO] [stdout]    |                ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/mini_grep.rs:31:16
[INFO] [stdout]    |
[INFO] [stdout] 31 |         pub fn new(args: &[String]) -> Result<Config, &'static str> {
[INFO] [stdout]    |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]   --> src/mini_grep.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 44 |     pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `search`
[INFO] [stdout]   --> src/mini_grep.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 60 |     fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `search_case_insensitive`
[INFO] [stdout]   --> src/mini_grep.rs:70:8
[INFO] [stdout]    |
[INFO] [stdout] 70 |     fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `simulated_expensive_calculation`
[INFO] [stdout]   --> src/closure.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn simulated_expensive_calculation(intensity: u32) -> u32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `CacheMap`
[INFO] [stdout]    --> src/closure.rs:105:8
[INFO] [stdout]     |
[INFO] [stdout] 105 | struct CacheMap<'a, T, V>
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/closure.rs:113:8
[INFO] [stdout]     |
[INFO] [stdout] 113 |     fn new(calculation: T) -> CacheMap<'a, T, V> {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]    --> src/closure.rs:120:8
[INFO] [stdout]     |
[INFO] [stdout] 120 |     fn value(&mut self, arg: &'a V) -> &'a V {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `iterator_study`
[INFO] [stdout]  --> src/iterator.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn iterator_study() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shoes_in_my_size`
[INFO] [stdout]   --> src/iterator.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn shoes_in_my_size(shoes: Vec<Shoe>, size: u32) -> Vec<Shoe> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/iterator.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn new() -> Counter {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `point`
[INFO] [stdout]  --> src/smart_pointer.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn point() {
[INFO] [stdout]   |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cons`
[INFO] [stdout]   --> src/smart_pointer.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     Cons(i32, Box<List>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nil`
[INFO] [stdout]   --> src/smart_pointer.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     Nil,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/smart_pointer.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn new(x: T) -> MyBox<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `hello`
[INFO] [stdout]   --> src/smart_pointer.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn hello(name: &str) {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `ListRc`
[INFO] [stdout]    --> src/smart_pointer.rs:112:6
[INFO] [stdout]     |
[INFO] [stdout] 112 | enum ListRc {
[INFO] [stdout]     |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `LimitTracker`
[INFO] [stdout]    --> src/smart_pointer.rs:139:12
[INFO] [stdout]     |
[INFO] [stdout] 139 | pub struct LimitTracker<'a, T: Messenger> {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/smart_pointer.rs:147:12
[INFO] [stdout]     |
[INFO] [stdout] 147 |     pub fn new(messenger: &T, max: usize) -> LimitTracker<T> {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `set_value`
[INFO] [stdout]    --> src/smart_pointer.rs:155:12
[INFO] [stdout]     |
[INFO] [stdout] 155 |     pub fn set_value(&mut self, value: usize) {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_one`
[INFO] [stdout]  --> src/unsafe_study/function_pointer.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn add_one(x: i32) -> i32 {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `do_twice`
[INFO] [stdout]  --> src/unsafe_study/function_pointer.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn do_twice(f: fn(i32) -> i32, arg: i32) -> i32 {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `do_twice_v1`
[INFO] [stdout]   --> src/unsafe_study/function_pointer.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn do_twice_v1<T>(f: T, arg: i32) -> i32
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Status`
[INFO] [stdout]   --> src/unsafe_study/function_pointer.rs:15:6
[INFO] [stdout]    |
[INFO] [stdout] 15 | enum Status {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `returns_closure`
[INFO] [stdout]   --> src/unsafe_study/function_pointer.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn returns_closure() -> Box<dyn Fn(i32) -> i32> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unsafe_use`
[INFO] [stdout]  --> src/unsafe_study/mod.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn unsafe_use() {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `dangerous`
[INFO] [stdout]   --> src/unsafe_study/mod.rs:42:11
[INFO] [stdout]    |
[INFO] [stdout] 42 | unsafe fn dangerous() {}
[INFO] [stdout]    |           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `split_at_mut`
[INFO] [stdout]   --> src/unsafe_study/mod.rs:45:4
[INFO] [stdout]    |
[INFO] [stdout] 45 | fn split_at_mut(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `abs`
[INFO] [stdout]   --> src/unsafe_study/mod.rs:60:5
[INFO] [stdout]    |
[INFO] [stdout] 60 |     fn abs(input: i32) -> i32;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `MAX_POINTS`
[INFO] [stdout]   --> src/unsafe_study/mod.rs:84:1
[INFO] [stdout]    |
[INFO] [stdout] 84 | const MAX_POINTS: u32 = 100_000;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static is never used: `HELLO_WORLD`
[INFO] [stdout]   --> src/unsafe_study/mod.rs:87:1
[INFO] [stdout]    |
[INFO] [stdout] 87 | static HELLO_WORLD: &str = "Hello, world!";
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static is never used: `COUNTER`
[INFO] [stdout]   --> src/unsafe_study/mod.rs:88:1
[INFO] [stdout]    |
[INFO] [stdout] 88 | static mut COUNTER: u32 = 0;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `never_type`
[INFO] [stdout]    --> src/unsafe_study/mod.rs:212:4
[INFO] [stdout]     |
[INFO] [stdout] 212 | fn never_type() {}
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Executor`
[INFO] [stdout]   --> src/asynchronous/timer/executor.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | struct Executor {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `future`
[INFO] [stdout]   --> src/asynchronous/timer/executor.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 |     future: Mutex<Option<BoxFuture<'static, ()>>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `spawn`
[INFO] [stdout]   --> src/asynchronous/timer/executor.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn spawn(&self, future: impl Future<Output=()> + Send + 'static) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `run`
[INFO] [stdout]   --> src/asynchronous/timer/executor.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 |     fn run(&self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `new_executor_and_spawner`
[INFO] [stdout]   --> src/asynchronous/timer/executor.rs:76:4
[INFO] [stdout]    |
[INFO] [stdout] 76 | fn new_executor_and_spawner() -> (Executor, Spawner) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/asynchronous/timer/mod.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub fn new(duration: Duration) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Song`
[INFO] [stdout]   --> src/asynchronous/mod.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct Song {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `learn_song`
[INFO] [stdout]   --> src/asynchronous/mod.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn learn_song() -> Song {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sing_song`
[INFO] [stdout]   --> src/asynchronous/mod.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn sing_song(song: Song) {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `dance`
[INFO] [stdout]   --> src/asynchronous/mod.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn dance() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `learn_song_async`
[INFO] [stdout]   --> src/asynchronous/mod.rs:42:10
[INFO] [stdout]    |
[INFO] [stdout] 42 | async fn learn_song_async() -> Song {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sing_song_async`
[INFO] [stdout]   --> src/asynchronous/mod.rs:50:10
[INFO] [stdout]    |
[INFO] [stdout] 50 | async fn sing_song_async(song: Song) {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `dance_async`
[INFO] [stdout]   --> src/asynchronous/mod.rs:55:10
[INFO] [stdout]    |
[INFO] [stdout] 55 | async fn dance_async() {
[INFO] [stdout]    |          ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `learn_and_sing`
[INFO] [stdout]   --> src/asynchronous/mod.rs:60:10
[INFO] [stdout]    |
[INFO] [stdout] 60 | async fn learn_and_sing() {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `async_main`
[INFO] [stdout]   --> src/asynchronous/mod.rs:65:10
[INFO] [stdout]    |
[INFO] [stdout] 65 | async fn async_main() {
[INFO] [stdout]    |          ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fib`
[INFO] [stdout]    --> src/main.rs:126:4
[INFO] [stdout]     |
[INFO] [stdout] 126 | fn fib(n: i32) -> i32 {
[INFO] [stdout]     |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fib1`
[INFO] [stdout]    --> src/main.rs:143:4
[INFO] [stdout]     |
[INFO] [stdout] 143 | fn fib1(n: i32) -> i32 {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> src/main.rs:182:5
[INFO] [stdout]     |
[INFO] [stdout] 182 |     Quit,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]    --> src/main.rs:183:5
[INFO] [stdout]     |
[INFO] [stdout] 183 |     Move { x: i32, y: i32 },
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ChangeColor`
[INFO] [stdout]    --> src/main.rs:185:5
[INFO] [stdout]     |
[INFO] [stdout] 185 |     ChangeColor(i32, i32, i32),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alaska`
[INFO] [stdout]    --> src/main.rs:198:5
[INFO] [stdout]     |
[INFO] [stdout] 198 |     Alaska,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Penny`
[INFO] [stdout]    --> src/main.rs:203:5
[INFO] [stdout]     |
[INFO] [stdout] 203 |     Penny,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nickel`
[INFO] [stdout]    --> src/main.rs:204:5
[INFO] [stdout]     |
[INFO] [stdout] 204 |     Nickel,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Dime`
[INFO] [stdout]    --> src/main.rs:205:5
[INFO] [stdout]     |
[INFO] [stdout] 205 |     Dime,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 114 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 38.15s
[INFO] running `Command { std: "docker" "inspect" "6d03a8d9dc7e545123058c01d6fda5c48a8463783225a3d7e48055323547412a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d03a8d9dc7e545123058c01d6fda5c48a8463783225a3d7e48055323547412a", kill_on_drop: false }`
[INFO] [stdout] 6d03a8d9dc7e545123058c01d6fda5c48a8463783225a3d7e48055323547412a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 10bb30a42aac06049b48a5780c85d6272c9d06de91dc0af89a1e1383d7fe1f91
[INFO] running `Command { std: "docker" "start" "-a" "10bb30a42aac06049b48a5780c85d6272c9d06de91dc0af89a1e1383d7fe1f91", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `soup`
[INFO] [stdout]   --> src/lib.rs:81:9
[INFO] [stdout]    |
[INFO] [stdout] 81 |     let soup = back_of_house::Appetizer::Soup;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_soup`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add`
[INFO] [stdout]  --> src/front_of_house.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 |     fn add() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `take_order`
[INFO] [stdout]   --> src/front_of_house.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 |         fn take_order() {}
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `server_order`
[INFO] [stdout]   --> src/front_of_house.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout] 13 |         fn server_order() {}
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `take_payment`
[INFO] [stdout]   --> src/front_of_house.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 |         fn take_payment() {}
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `serve_order`
[INFO] [stdout]   --> src/lib.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn serve_order() {}
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fix_incorrect_order`
[INFO] [stdout]   --> src/lib.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 |     fn fix_incorrect_order() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `cook_order`
[INFO] [stdout]   --> src/lib.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 |     fn cook_order() {}
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `seasonal_fruit`
[INFO] [stdout]   --> src/lib.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |         seasonal_fruit: String,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Salad`
[INFO] [stdout]   --> src/lib.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |         Salad,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `soup`
[INFO] [stdout]   --> src/lib.rs:81:9
[INFO] [stdout]    |
[INFO] [stdout] 81 |     let soup = back_of_house::Appetizer::Soup;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_soup`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add`
[INFO] [stdout]  --> src/front_of_house.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 |     fn add() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `take_order`
[INFO] [stdout]   --> src/front_of_house.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 |         fn take_order() {}
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `server_order`
[INFO] [stdout]   --> src/front_of_house.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout] 13 |         fn server_order() {}
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `take_payment`
[INFO] [stdout]   --> src/front_of_house.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 |         fn take_payment() {}
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `serve_order`
[INFO] [stdout]   --> src/lib.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn serve_order() {}
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fix_incorrect_order`
[INFO] [stdout]   --> src/lib.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 |     fn fix_incorrect_order() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `cook_order`
[INFO] [stdout]   --> src/lib.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 |     fn cook_order() {}
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `seasonal_fruit`
[INFO] [stdout]   --> src/lib.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |         seasonal_fruit: String,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Salad`
[INFO] [stdout]   --> src/lib.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |         Salad,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/closure.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 |     /// 下面这段代码无法通过编译
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/closure.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     /// 因为使用了 [move] 导致 x 的所有权被转移到了 闭包[equal_to_x] 中
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]    |
[INFO] [stdout]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/closure.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     /// 当下一行想去输出 x 的时候已经无法获取到所有权了
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]    |
[INFO] [stdout]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]  --> src/unsafe_study/mod.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     /// 不安全的创建裸指针的方法
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]   |
[INFO] [stdout]   = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/smart_pointer.rs:208:5
[INFO] [stdout]     |
[INFO] [stdout] 208 |     /// 下列代码无法编译通过。因为 x 是不可变的，所以无法可变的借用他
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]     |
[INFO] [stdout]     = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/smart_pointer.rs:209:5
[INFO] [stdout]     |
[INFO] [stdout] 209 |     /// 借用规则的一个推论是当有一个不可变值时，不能可变地借用它
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]     |
[INFO] [stdout]     = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/unsafe_study/function_pointer.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     /// 函数指针实现了所有三个闭包 trait（Fn、FnMut 和 FnOnce），所以总是可以在调用期望闭包的函数时传递函数指针作为参数。                                           ...
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]    |
[INFO] [stdout]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/unsafe_study/function_pointer.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     /// 倾向于编写使用泛型和闭包 trait 的函数，这样它就能接受函数或闭包作为参数。
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]    |
[INFO] [stdout]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cmp::Ordering`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::cmp::Ordering;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::Rng`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use rand::Rng;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/string.rs:43:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | /     /// UTF-8编码时 一个汉字字符储存需要3到4个字节,所以 0.。1 运行会直接报错！！！！！！！
[INFO] [stdout] 44 | |     /// let c = &str[0..1];
[INFO] [stdout] 45 | |     /// println!("{}", c);
[INFO] [stdout]    | |__________________________^
[INFO] [stdout] 46 | 
[INFO] [stdout] 47 |       let chars = str.chars();
[INFO] [stdout]    |       ------------------------ rustdoc does not generate documentation for statements
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/collection.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | /     /// 获取了 vector 的第一个元素的不可变引用并尝试在 vector 末尾增加一个元素的时候，这是行不通的
[INFO] [stdout] 28 | |     /// let new_one = &vector[0];
[INFO] [stdout] 29 | |     /// vector.push(5);
[INFO] [stdout] 30 | |     /// println!("vec one :{}", new_one);
[INFO] [stdout]    | |_________________________________________^
[INFO] [stdout] 31 | 
[INFO] [stdout] 32 |       let num = vec![100, 233, 1232];
[INFO] [stdout]    |       ------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/map.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | /     /// u32 实现了 Copy trait 的类型，其值可以拷贝进哈希 map
[INFO] [stdout] 12 | |     /// 但是 String 的所有权会被转移到 map 中，
[INFO] [stdout] 13 | |     /// let mut map: HashMap<String, u32> = HashMap::new();
[INFO] [stdout] 14 | |     /// map.insert(jack, 23); // jack 的所有权已经被转移
[INFO] [stdout]    | |________________________________________________________^
[INFO] [stdout] ...
[INFO] [stdout] 17 |       let key = vec![String::from("Jack"), String::from("Rose")];
[INFO] [stdout]    |       ----------------------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/map.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     /// 必须使用 HashMap<_, _> 表明类型
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 20 |     let mut map: HashMap<_, _> = key.iter().zip(value.iter()).collect();
[INFO] [stdout]    |     -------------------------------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/map.rs:52:5
[INFO] [stdout]    |
[INFO] [stdout] 52 |     /// 根据旧值更新新值
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 53 |     let text = "hello world wonderful world";
[INFO] [stdout]    |     ----------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]   --> src/practice.rs:43:23
[INFO] [stdout]    |
[INFO] [stdout] 43 |     if len / 2 == 0 { (vec[len / 2 - 1] + vec[len / 2]) } else { vec[len / 2] }
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Display`
[INFO] [stdout]  --> src/trait_study.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::Display;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/trait_study.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | /     /// 返回错误，只有泛型为 f32 的才定义了这个方法
[INFO] [stdout] 12 | |     /// println!("distance_from_origin: {}", p.distance_from_origin());
[INFO] [stdout]    | |_______________________________________________________________________^
[INFO] [stdout] 13 |       let p = Point { x: 20.0, y: 30.0 };
[INFO] [stdout]    |       ----------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/closure.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | /     /// 闭包捕获环境
[INFO] [stdout] 21 | |     /// 如果你希望强制闭包获取其使用的环境值的所有权，可以在参数列表前使用 [move] 关键字
[INFO] [stdout] 22 | |     /// 类似：let equal_to_x = move |z| z == x;
[INFO] [stdout]    | |_______________________________________________^
[INFO] [stdout] 23 |       let x = 4;
[INFO] [stdout]    |       ---------- rustdoc does not generate documentation for statements
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/smart_pointer.rs:97:5
[INFO] [stdout]    |
[INFO] [stdout] 97 |     /// 变量以被创建时 [相反] 的顺序被丢弃
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 98 |     let c = CustomSmartPointer { data: String::from("my stuff") };
[INFO] [stdout]    |     -------------------------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/concurrent/thread_study.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |         /// 可以将 drop 放在这里，因为 [move] 会将变量的所有权转移到闭包中
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 33 |         drop(vec);
[INFO] [stdout]    |         --------- rustdoc does not generate documentation for expressions
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/unsafe_study/function_pointer.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 36 |       /// 元组结构体和元组结构体枚举成员,它们也被称为实现了闭包 trait 的函数指针，
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 37 | /     let list_of_statuses: Vec<Status> =
[INFO] [stdout] 38 | |         (0u32..20)
[INFO] [stdout] 39 | |             .map(Status::Value)
[INFO] [stdout] 40 | |             .collect();
[INFO] [stdout]    | |_______________________- rustdoc does not generate documentation for statements
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Formatter`
[INFO] [stdout]  --> src/unsafe_study/mod.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::fmt::Formatter;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/unsafe_study/mod.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |       /// 只能在 unsafe 上下文中 [解引用]
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 35 | /     unsafe {
[INFO] [stdout] 36 | |         println!("r1 is: {}", *r1);
[INFO] [stdout] 37 | |         println!("r2 is: {}", *r2);
[INFO] [stdout] 38 | |     }
[INFO] [stdout]    | |_____- rustdoc does not generate documentation for expressions
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/unsafe_study/mod.rs:77:5
[INFO] [stdout]    |
[INFO] [stdout] 77 |       /// 通过 [extern] 关键字，来调用 C 的函数
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 78 | /     unsafe {
[INFO] [stdout] 79 | |         println!("Absolute value of -3 according to C: {}", abs(-3));
[INFO] [stdout] 80 | |     }
[INFO] [stdout]    | |_____- rustdoc does not generate documentation for expressions
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/unsafe_study/mod.rs:93:5
[INFO] [stdout]    |
[INFO] [stdout] 93 |       /// 读取或修改一个可变静态变量是不安全的
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 94 | /     unsafe {
[INFO] [stdout] 95 | |         COUNTER += 1;
[INFO] [stdout] 96 | |     }
[INFO] [stdout]    | |_____- rustdoc does not generate documentation for expressions
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Point_v1` should have an upper camel case name
[INFO] [stdout]    --> src/unsafe_study/mod.rs:115:8
[INFO] [stdout]     |
[INFO] [stdout] 115 | struct Point_v1 {
[INFO] [stdout]     |        ^^^^^^^^ help: convert the identifier to upper camel case: `PointV1`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `SystemTime`
[INFO] [stdout]  --> src/asynchronous/mod.rs:6:27
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::time::{Duration, SystemTime};
[INFO] [stdout]   |                           ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `some_str`
[INFO] [stdout]   --> src/main.rs:87:9
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let some_str = Some("hello");
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_str`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `none`
[INFO] [stdout]   --> src/main.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 88 |     let none: Option<u32> = None;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_none`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]    --> src/main.rs:105:9
[INFO] [stdout]     |
[INFO] [stdout] 105 |     let mut count = 0;
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_count` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/main.rs:108:14
[INFO] [stdout]     |
[INFO] [stdout] 108 |     } else { count += 1 }
[INFO] [stdout]     |              ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `tmp` is never read
[INFO] [stdout]    --> src/main.rs:133:9
[INFO] [stdout]     |
[INFO] [stdout] 133 |     let mut tmp = 0;
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:134:9
[INFO] [stdout]     |
[INFO] [stdout] 134 |     for i in 2..n + 1 {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `new_str`
[INFO] [stdout]  --> src/string.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let new_str = String::new();
[INFO] [stdout]   |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_new_str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> src/string.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let s = data.to_string();
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> src/string.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let s = "initial contents".to_string();
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> src/string.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let s = String::from("initial contents");
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/collection.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |         let v = vec![1, 2, 3];
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/collection.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |     let row = vec![
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]   --> src/practice.rs:26:19
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let (mut cnt, len, mut res) = (0, vec.len(), vec[0]);
[INFO] [stdout]    |                   ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let f = match f {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let f = match f {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let f = File::open("rust.txt").unwrap_or_else(|error| {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let f = File::open("rust.txt").unwrap();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let f = File::open("rust.txt").expect("can't open file rust.txt");
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v1`
[INFO] [stdout]    --> src/closure.rs:130:9
[INFO] [stdout]     |
[INFO] [stdout] 130 |     let v1 = c.value(1);
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_v1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v1`
[INFO] [stdout]    --> src/closure.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 140 |     let v1 = c.value(&1);
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_v1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]    --> src/closure.rs:145:9
[INFO] [stdout]     |
[INFO] [stdout] 145 |     let r1 = cache.value(&"aa");
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]  --> src/smart_pointer.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let b = Box::new(5);
[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/smart_pointer.rs:98:9
[INFO] [stdout]    |
[INFO] [stdout] 98 |     let c = CustomSmartPointer { data: String::from("my stuff") };
[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/smart_pointer.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |     let d = CustomSmartPointer { data: String::from("other stuff") };
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/smart_pointer.rs:124:9
[INFO] [stdout]     |
[INFO] [stdout] 124 |     let b = ConsRc(3, Rc::clone(&a));
[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/smart_pointer.rs:127:13
[INFO] [stdout]     |
[INFO] [stdout] 127 |         let c = ConsRc(4, 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: `list_of_statuses`
[INFO] [stdout]   --> src/unsafe_study/function_pointer.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let list_of_statuses: Vec<Status> =
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_list_of_statuses`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f1`
[INFO] [stdout]   --> src/asynchronous/mod.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     let f1 = learn_and_sing();
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_f1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f2`
[INFO] [stdout]   --> src/asynchronous/mod.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let f2 = dance_async();
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_f2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/collection.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut vector = vec![1, 2, 3]; // 利用 vec! 宏 来创建
[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/iterator.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut v1_iter = v1.iter();
[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/unsafe_study/mod.rs:200:9
[INFO] [stdout]     |
[INFO] [stdout] 200 |     let mut w = Wrapper(vec![String::from("hello"), String::from("world")]);
[INFO] [stdout]     |         ----^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `string_study`
[INFO] [stdout]  --> src/string.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn string_study() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `my_collection`
[INFO] [stdout]  --> src/collection.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn my_collection() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `SpreadsheetCell`
[INFO] [stdout]   --> src/collection.rs:54:6
[INFO] [stdout]    |
[INFO] [stdout] 54 | enum SpreadsheetCell {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `map_study`
[INFO] [stdout]  --> src/map.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn map_study() {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `bubble_sort`
[INFO] [stdout]   --> src/practice.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn bubble_sort(vec: &mut Vec<u32>) {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file_v1`
[INFO] [stdout]   --> src/error.rs:65:4
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn read_username_from_file_v1() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file_v2`
[INFO] [stdout]   --> src/error.rs:72:4
[INFO] [stdout]    |
[INFO] [stdout] 72 | fn read_username_from_file_v2() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify_t_d_where`
[INFO] [stdout]    --> src/trait_study.rs:149:4
[INFO] [stdout]     |
[INFO] [stdout] 149 | fn notify_t_d_where<T>(item: T)
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `grep`
[INFO] [stdout]  --> src/mini_grep.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn grep() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Config`
[INFO] [stdout]   --> src/mini_grep.rs:24:16
[INFO] [stdout]    |
[INFO] [stdout] 24 |     pub struct Config {
[INFO] [stdout]    |                ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/mini_grep.rs:31:16
[INFO] [stdout]    |
[INFO] [stdout] 31 |         pub fn new(args: &[String]) -> Result<Config, &'static str> {
[INFO] [stdout]    |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]   --> src/mini_grep.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 44 |     pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `simulated_expensive_calculation`
[INFO] [stdout]   --> src/closure.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn simulated_expensive_calculation(intensity: u32) -> u32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Stop`
[INFO] [stdout]   --> src/unsafe_study/function_pointer.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     Stop,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `returns_closure`
[INFO] [stdout]   --> src/unsafe_study/function_pointer.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn returns_closure() -> Box<dyn Fn(i32) -> i32> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unsafe_use`
[INFO] [stdout]  --> src/unsafe_study/mod.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn unsafe_use() {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `MAX_POINTS`
[INFO] [stdout]   --> src/unsafe_study/mod.rs:84:1
[INFO] [stdout]    |
[INFO] [stdout] 84 | const MAX_POINTS: u32 = 100_000;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static is never used: `HELLO_WORLD`
[INFO] [stdout]   --> src/unsafe_study/mod.rs:87:1
[INFO] [stdout]    |
[INFO] [stdout] 87 | static HELLO_WORLD: &str = "Hello, world!";
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `never_type`
[INFO] [stdout]    --> src/unsafe_study/mod.rs:212:4
[INFO] [stdout]     |
[INFO] [stdout] 212 | fn never_type() {}
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fib`
[INFO] [stdout]    --> src/main.rs:126:4
[INFO] [stdout]     |
[INFO] [stdout] 126 | fn fib(n: i32) -> i32 {
[INFO] [stdout]     |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fib1`
[INFO] [stdout]    --> src/main.rs:143:4
[INFO] [stdout]     |
[INFO] [stdout] 143 | fn fib1(n: i32) -> i32 {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> src/main.rs:182:5
[INFO] [stdout]     |
[INFO] [stdout] 182 |     Quit,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]    --> src/main.rs:183:5
[INFO] [stdout]     |
[INFO] [stdout] 183 |     Move { x: i32, y: i32 },
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ChangeColor`
[INFO] [stdout]    --> src/main.rs:185:5
[INFO] [stdout]     |
[INFO] [stdout] 185 |     ChangeColor(i32, i32, i32),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alaska`
[INFO] [stdout]    --> src/main.rs:198:5
[INFO] [stdout]     |
[INFO] [stdout] 198 |     Alaska,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Penny`
[INFO] [stdout]    --> src/main.rs:203:5
[INFO] [stdout]     |
[INFO] [stdout] 203 |     Penny,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nickel`
[INFO] [stdout]    --> src/main.rs:204:5
[INFO] [stdout]     |
[INFO] [stdout] 204 |     Nickel,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Dime`
[INFO] [stdout]    --> src/main.rs:205:5
[INFO] [stdout]     |
[INFO] [stdout] 205 |     Dime,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 89 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 3.55s
[INFO] running `Command { std: "docker" "inspect" "10bb30a42aac06049b48a5780c85d6272c9d06de91dc0af89a1e1383d7fe1f91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "10bb30a42aac06049b48a5780c85d6272c9d06de91dc0af89a1e1383d7fe1f91", kill_on_drop: false }`
[INFO] [stdout] 10bb30a42aac06049b48a5780c85d6272c9d06de91dc0af89a1e1383d7fe1f91
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d64c84b38a82b73c5c1d1c63394cd73d44d7d4d6a740f00a4163782a4f787621
[INFO] running `Command { std: "docker" "start" "-a" "d64c84b38a82b73c5c1d1c63394cd73d44d7d4d6a740f00a4163782a4f787621", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `soup`
[INFO] [stderr]   --> src/lib.rs:81:9
[INFO] [stderr]    |
[INFO] [stderr] 81 |     let soup = back_of_house::Appetizer::Soup;
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_soup`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add`
[INFO] [stderr]  --> src/front_of_house.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 |     fn add() {
[INFO] [stderr]   |        ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `take_order`
[INFO] [stderr]   --> src/front_of_house.rs:11:12
[INFO] [stderr]    |
[INFO] [stderr] 11 |         fn take_order() {}
[INFO] [stderr]    |            ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `server_order`
[INFO] [stderr]   --> src/front_of_house.rs:13:12
[INFO] [stderr]    |
[INFO] [stderr] 13 |         fn server_order() {}
[INFO] [stderr]    |            ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `take_payment`
[INFO] [stderr]   --> src/front_of_house.rs:15:12
[INFO] [stderr]    |
[INFO] [stderr] 15 |         fn take_payment() {}
[INFO] [stderr]    |            ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `serve_order`
[INFO] [stderr]   --> src/lib.rs:29:4
[INFO] [stderr]    |
[INFO] [stderr] 29 | fn serve_order() {}
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fix_incorrect_order`
[INFO] [stderr]   --> src/lib.rs:32:8
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn fix_incorrect_order() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `cook_order`
[INFO] [stderr]   --> src/lib.rs:37:8
[INFO] [stderr]    |
[INFO] [stderr] 37 |     fn cook_order() {}
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `seasonal_fruit`
[INFO] [stderr]   --> src/lib.rs:41:9
[INFO] [stderr]    |
[INFO] [stderr] 41 |         seasonal_fruit: String,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Salad`
[INFO] [stderr]   --> src/lib.rs:55:9
[INFO] [stderr]    |
[INFO] [stderr] 55 |         Salad,
[INFO] [stderr]    |         ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 10 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `soup`
[INFO] [stderr]   --> src/lib.rs:81:9
[INFO] [stderr]    |
[INFO] [stderr] 81 |     let soup = back_of_house::Appetizer::Soup;
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_soup`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add`
[INFO] [stderr]  --> src/front_of_house.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 |     fn add() {
[INFO] [stderr]   |        ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `take_order`
[INFO] [stderr]   --> src/front_of_house.rs:11:12
[INFO] [stderr]    |
[INFO] [stderr] 11 |         fn take_order() {}
[INFO] [stderr]    |            ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `server_order`
[INFO] [stderr]   --> src/front_of_house.rs:13:12
[INFO] [stderr]    |
[INFO] [stderr] 13 |         fn server_order() {}
[INFO] [stderr]    |            ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `take_payment`
[INFO] [stderr]   --> src/front_of_house.rs:15:12
[INFO] [stderr]    |
[INFO] [stderr] 15 |         fn take_payment() {}
[INFO] [stderr]    |            ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `serve_order`
[INFO] [stderr]   --> src/lib.rs:29:4
[INFO] [stderr]    |
[INFO] [stderr] 29 | fn serve_order() {}
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fix_incorrect_order`
[INFO] [stderr]   --> src/lib.rs:32:8
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn fix_incorrect_order() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `cook_order`
[INFO] [stderr]   --> src/lib.rs:37:8
[INFO] [stderr]    |
[INFO] [stderr] 37 |     fn cook_order() {}
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `seasonal_fruit`
[INFO] [stderr]   --> src/lib.rs:41:9
[INFO] [stderr]    |
[INFO] [stderr] 41 |         seasonal_fruit: String,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Salad`
[INFO] [stderr]   --> src/lib.rs:55:9
[INFO] [stderr]    |
[INFO] [stderr] 55 |         Salad,
[INFO] [stderr]    |         ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 10 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/closure.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     /// 下面这段代码无法通过编译
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/closure.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     /// 因为使用了 [move] 导致 x 的所有权被转移到了 闭包[equal_to_x] 中
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stderr]    |
[INFO] [stderr]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/closure.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     /// 当下一行想去输出 x 的时候已经无法获取到所有权了
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stderr]    |
[INFO] [stderr]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]  --> src/unsafe_study/mod.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     /// 不安全的创建裸指针的方法
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stderr]   |
[INFO] [stderr]   = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]    --> src/smart_pointer.rs:208:5
[INFO] [stderr]     |
[INFO] [stderr] 208 |     /// 下列代码无法编译通过。因为 x 是不可变的，所以无法可变的借用他
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stderr]     |
[INFO] [stderr]     = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]    --> src/smart_pointer.rs:209:5
[INFO] [stderr]     |
[INFO] [stderr] 209 |     /// 借用规则的一个推论是当有一个不可变值时，不能可变地借用它
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stderr]     |
[INFO] [stderr]     = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/unsafe_study/function_pointer.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     /// 函数指针实现了所有三个闭包 trait（Fn、FnMut 和 FnOnce），所以总是可以在调用期望闭包的函数时传递函数指针作为参数。                                           ...
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stderr]    |
[INFO] [stderr]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/unsafe_study/function_pointer.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     /// 倾向于编写使用泛型和闭包 trait 的函数，这样它就能接受函数或闭包作为参数。
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stderr]    |
[INFO] [stderr]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp::Ordering`
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::cmp::Ordering;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rand::Rng`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use rand::Rng;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/string.rs:43:5
[INFO] [stderr]    |
[INFO] [stderr] 43 | /     /// UTF-8编码时 一个汉字字符储存需要3到4个字节,所以 0.。1 运行会直接报错！！！！！！！
[INFO] [stderr] 44 | |     /// let c = &str[0..1];
[INFO] [stderr] 45 | |     /// println!("{}", c);
[INFO] [stderr]    | |__________________________^
[INFO] [stderr] 46 | 
[INFO] [stderr] 47 |       let chars = str.chars();
[INFO] [stderr]    |       ------------------------ rustdoc does not generate documentation for statements
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/collection.rs:27:5
[INFO] [stderr]    |
[INFO] [stderr] 27 | /     /// 获取了 vector 的第一个元素的不可变引用并尝试在 vector 末尾增加一个元素的时候，这是行不通的
[INFO] [stderr] 28 | |     /// let new_one = &vector[0];
[INFO] [stderr] 29 | |     /// vector.push(5);
[INFO] [stderr] 30 | |     /// println!("vec one :{}", new_one);
[INFO] [stderr]    | |_________________________________________^
[INFO] [stderr] 31 | 
[INFO] [stderr] 32 |       let num = vec![100, 233, 1232];
[INFO] [stderr]    |       ------------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/map.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | /     /// u32 实现了 Copy trait 的类型，其值可以拷贝进哈希 map
[INFO] [stderr] 12 | |     /// 但是 String 的所有权会被转移到 map 中，
[INFO] [stderr] 13 | |     /// let mut map: HashMap<String, u32> = HashMap::new();
[INFO] [stderr] 14 | |     /// map.insert(jack, 23); // jack 的所有权已经被转移
[INFO] [stderr]    | |________________________________________________________^
[INFO] [stderr] ...
[INFO] [stderr] 17 |       let key = vec![String::from("Jack"), String::from("Rose")];
[INFO] [stderr]    |       ----------------------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/map.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     /// 必须使用 HashMap<_, _> 表明类型
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 20 |     let mut map: HashMap<_, _> = key.iter().zip(value.iter()).collect();
[INFO] [stderr]    |     -------------------------------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/map.rs:52:5
[INFO] [stderr]    |
[INFO] [stderr] 52 |     /// 根据旧值更新新值
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 53 |     let text = "hello world wonderful world";
[INFO] [stderr]    |     ----------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]   --> src/practice.rs:43:23
[INFO] [stderr]    |
[INFO] [stderr] 43 |     if len / 2 == 0 { (vec[len / 2 - 1] + vec[len / 2]) } else { vec[len / 2] }
[INFO] [stderr]    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fmt::Display`
[INFO] [stderr]  --> src/trait_study.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::fmt::Display;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/trait_study.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | /     /// 返回错误，只有泛型为 f32 的才定义了这个方法
[INFO] [stderr] 12 | |     /// println!("distance_from_origin: {}", p.distance_from_origin());
[INFO] [stderr]    | |_______________________________________________________________________^
[INFO] [stderr] 13 |       let p = Point { x: 20.0, y: 30.0 };
[INFO] [stderr]    |       ----------------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/closure.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 | /     /// 闭包捕获环境
[INFO] [stderr] 21 | |     /// 如果你希望强制闭包获取其使用的环境值的所有权，可以在参数列表前使用 [move] 关键字
[INFO] [stderr] 22 | |     /// 类似：let equal_to_x = move |z| z == x;
[INFO] [stderr]    | |_______________________________________________^
[INFO] [stderr] 23 |       let x = 4;
[INFO] [stderr]    |       ---------- rustdoc does not generate documentation for statements
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/smart_pointer.rs:97:5
[INFO] [stderr]    |
[INFO] [stderr] 97 |     /// 变量以被创建时 [相反] 的顺序被丢弃
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 98 |     let c = CustomSmartPointer { data: String::from("my stuff") };
[INFO] [stderr]    |     -------------------------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/concurrent/thread_study.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 |         /// 可以将 drop 放在这里，因为 [move] 会将变量的所有权转移到闭包中
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 33 |         drop(vec);
[INFO] [stderr]    |         --------- rustdoc does not generate documentation for expressions
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/unsafe_study/function_pointer.rs:36:5
[INFO] [stderr]    |
[INFO] [stderr] 36 |       /// 元组结构体和元组结构体枚举成员,它们也被称为实现了闭包 trait 的函数指针，
[INFO] [stderr]    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 37 | /     let list_of_statuses: Vec<Status> =
[INFO] [stderr] 38 | |         (0u32..20)
[INFO] [stderr] 39 | |             .map(Status::Value)
[INFO] [stderr] 40 | |             .collect();
[INFO] [stderr]    | |_______________________- rustdoc does not generate documentation for statements
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fmt::Formatter`
[INFO] [stderr]  --> src/unsafe_study/mod.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fmt::Formatter;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/unsafe_study/mod.rs:34:5
[INFO] [stderr]    |
[INFO] [stderr] 34 |       /// 只能在 unsafe 上下文中 [解引用]
[INFO] [stderr]    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 35 | /     unsafe {
[INFO] [stderr] 36 | |         println!("r1 is: {}", *r1);
[INFO] [stderr] 37 | |         println!("r2 is: {}", *r2);
[INFO] [stderr] 38 | |     }
[INFO] [stderr]    | |_____- rustdoc does not generate documentation for expressions
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/unsafe_study/mod.rs:77:5
[INFO] [stderr]    |
[INFO] [stderr] 77 |       /// 通过 [extern] 关键字，来调用 C 的函数
[INFO] [stderr]    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 78 | /     unsafe {
[INFO] [stderr] 79 | |         println!("Absolute value of -3 according to C: {}", abs(-3));
[INFO] [stderr] 80 | |     }
[INFO] [stderr]    | |_____- rustdoc does not generate documentation for expressions
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/unsafe_study/mod.rs:93:5
[INFO] [stderr]    |
[INFO] [stderr] 93 |       /// 读取或修改一个可变静态变量是不安全的
[INFO] [stderr]    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 94 | /     unsafe {
[INFO] [stderr] 95 | |         COUNTER += 1;
[INFO] [stderr] 96 | |     }
[INFO] [stderr]    | |_____- rustdoc does not generate documentation for expressions
[INFO] [stderr] 
[INFO] [stderr] warning: type `Point_v1` should have an upper camel case name
[INFO] [stderr]    --> src/unsafe_study/mod.rs:115:8
[INFO] [stderr]     |
[INFO] [stderr] 115 | struct Point_v1 {
[INFO] [stderr]     |        ^^^^^^^^ help: convert the identifier to upper camel case: `PointV1`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `SystemTime`
[INFO] [stderr]  --> src/asynchronous/mod.rs:6:27
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::time::{Duration, SystemTime};
[INFO] [stderr]   |                           ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `some_str`
[INFO] [stderr]   --> src/main.rs:87:9
[INFO] [stderr]    |
[INFO] [stderr] 87 |     let some_str = Some("hello");
[INFO] [stderr]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_str`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `none`
[INFO] [stderr]   --> src/main.rs:88:9
[INFO] [stderr]    |
[INFO] [stderr] 88 |     let none: Option<u32> = None;
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_none`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `count` is assigned to, but never used
[INFO] [stderr]    --> src/main.rs:105:9
[INFO] [stderr]     |
[INFO] [stderr] 105 |     let mut count = 0;
[INFO] [stderr]     |         ^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: consider using `_count` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `count` is never read
[INFO] [stderr]    --> src/main.rs:108:14
[INFO] [stderr]     |
[INFO] [stderr] 108 |     } else { count += 1 }
[INFO] [stderr]     |              ^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `tmp` is never read
[INFO] [stderr]    --> src/main.rs:133:9
[INFO] [stderr]     |
[INFO] [stderr] 133 |     let mut tmp = 0;
[INFO] [stderr]     |         ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/main.rs:134:9
[INFO] [stderr]     |
[INFO] [stderr] 134 |     for i in 2..n + 1 {
[INFO] [stderr]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `new_str`
[INFO] [stderr]  --> src/string.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let new_str = String::new();
[INFO] [stderr]   |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_new_str`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]  --> src/string.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let s = data.to_string();
[INFO] [stderr]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]  --> src/string.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let s = "initial contents".to_string();
[INFO] [stderr]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]  --> src/string.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let s = String::from("initial contents");
[INFO] [stderr]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]   --> src/collection.rs:13:13
[INFO] [stderr]    |
[INFO] [stderr] 13 |         let v = vec![1, 2, 3];
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `row`
[INFO] [stderr]   --> src/collection.rs:47:9
[INFO] [stderr]    |
[INFO] [stderr] 47 |     let row = vec![
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `len`
[INFO] [stderr]   --> src/practice.rs:26:19
[INFO] [stderr]    |
[INFO] [stderr] 26 |     let (mut cnt, len, mut res) = (0, vec.len(), vec[0]);
[INFO] [stderr]    |                   ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/error.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let f = match f {
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/error.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |     let f = match f {
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/error.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 |     let f = File::open("rust.txt").unwrap_or_else(|error| {
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/error.rs:42:9
[INFO] [stderr]    |
[INFO] [stderr] 42 |     let f = File::open("rust.txt").unwrap();
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/error.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 |     let f = File::open("rust.txt").expect("can't open file rust.txt");
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v1`
[INFO] [stderr]    --> src/closure.rs:130:9
[INFO] [stderr]     |
[INFO] [stderr] 130 |     let v1 = c.value(1);
[INFO] [stderr]     |         ^^ help: if this is intentional, prefix it with an underscore: `_v1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v1`
[INFO] [stderr]    --> src/closure.rs:140:9
[INFO] [stderr]     |
[INFO] [stderr] 140 |     let v1 = c.value(&1);
[INFO] [stderr]     |         ^^ help: if this is intentional, prefix it with an underscore: `_v1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stderr]    --> src/closure.rs:145:9
[INFO] [stderr]     |
[INFO] [stderr] 145 |     let r1 = cache.value(&"aa");
[INFO] [stderr]     |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]  --> src/smart_pointer.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let b = Box::new(5);
[INFO] [stderr]   |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]   --> src/smart_pointer.rs:98:9
[INFO] [stderr]    |
[INFO] [stderr] 98 |     let c = CustomSmartPointer { data: String::from("my stuff") };
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `d`
[INFO] [stderr]   --> src/smart_pointer.rs:99:9
[INFO] [stderr]    |
[INFO] [stderr] 99 |     let d = CustomSmartPointer { data: String::from("other stuff") };
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]    --> src/smart_pointer.rs:124:9
[INFO] [stderr]     |
[INFO] [stderr] 124 |     let b = ConsRc(3, Rc::clone(&a));
[INFO] [stderr]     |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]    --> src/smart_pointer.rs:127:13
[INFO] [stderr]     |
[INFO] [stderr] 127 |         let c = ConsRc(4, Rc::clone(&a));
[INFO] [stderr]     |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `list_of_statuses`
[INFO] [stderr]   --> src/unsafe_study/function_pointer.rs:37:9
[INFO] [stderr]    |
[INFO] [stderr] 37 |     let list_of_statuses: Vec<Status> =
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_list_of_statuses`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f1`
[INFO] [stderr]   --> src/asynchronous/mod.rs:66:9
[INFO] [stderr]    |
[INFO] [stderr] 66 |     let f1 = learn_and_sing();
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_f1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f2`
[INFO] [stderr]   --> src/asynchronous/mod.rs:67:9
[INFO] [stderr]    |
[INFO] [stderr] 67 |     let f2 = dance_async();
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_f2`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/collection.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let mut vector = vec![1, 2, 3]; // 利用 vec! 宏 来创建
[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/iterator.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let mut v1_iter = v1.iter();
[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/unsafe_study/mod.rs:200:9
[INFO] [stderr]     |
[INFO] [stderr] 200 |     let mut w = Wrapper(vec![String::from("hello"), String::from("world")]);
[INFO] [stderr]     |         ----^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `string_study`
[INFO] [stderr]  --> src/string.rs:2:8
[INFO] [stderr]   |
[INFO] [stderr] 2 | pub fn string_study() {
[INFO] [stderr]   |        ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `my_collection`
[INFO] [stderr]  --> src/collection.rs:2:8
[INFO] [stderr]   |
[INFO] [stderr] 2 | pub fn my_collection() {
[INFO] [stderr]   |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `SpreadsheetCell`
[INFO] [stderr]   --> src/collection.rs:54:6
[INFO] [stderr]    |
[INFO] [stderr] 54 | enum SpreadsheetCell {
[INFO] [stderr]    |      ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `map_study`
[INFO] [stderr]  --> src/map.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub fn map_study() {
[INFO] [stderr]   |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `bubble_sort`
[INFO] [stderr]   --> src/practice.rs:47:4
[INFO] [stderr]    |
[INFO] [stderr] 47 | fn bubble_sort(vec: &mut Vec<u32>) {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file_v1`
[INFO] [stderr]   --> src/error.rs:65:4
[INFO] [stderr]    |
[INFO] [stderr] 65 | fn read_username_from_file_v1() -> Result<String, io::Error> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file_v2`
[INFO] [stderr]   --> src/error.rs:72:4
[INFO] [stderr]    |
[INFO] [stderr] 72 | fn read_username_from_file_v2() -> Result<String, io::Error> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `notify_t_d_where`
[INFO] [stderr]    --> src/trait_study.rs:149:4
[INFO] [stderr]     |
[INFO] [stderr] 149 | fn notify_t_d_where<T>(item: T)
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `grep`
[INFO] [stderr]  --> src/mini_grep.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn grep() {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Config`
[INFO] [stderr]   --> src/mini_grep.rs:24:16
[INFO] [stderr]    |
[INFO] [stderr] 24 |     pub struct Config {
[INFO] [stderr]    |                ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/mini_grep.rs:31:16
[INFO] [stderr]    |
[INFO] [stderr] 31 |         pub fn new(args: &[String]) -> Result<Config, &'static str> {
[INFO] [stderr]    |                ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `run`
[INFO] [stderr]   --> src/mini_grep.rs:44:12
[INFO] [stderr]    |
[INFO] [stderr] 44 |     pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `simulated_expensive_calculation`
[INFO] [stderr]   --> src/closure.rs:41:4
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn simulated_expensive_calculation(intensity: u32) -> u32 {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Stop`
[INFO] [stderr]   --> src/unsafe_study/function_pointer.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     Stop,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `returns_closure`
[INFO] [stderr]   --> src/unsafe_study/function_pointer.rs:21:4
[INFO] [stderr]    |
[INFO] [stderr] 21 | fn returns_closure() -> Box<dyn Fn(i32) -> i32> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `unsafe_use`
[INFO] [stderr]  --> src/unsafe_study/mod.rs:7:4
[INFO] [stderr]   |
[INFO] [stderr] 7 | fn unsafe_use() {
[INFO] [stderr]   |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `MAX_POINTS`
[INFO] [stderr]   --> src/unsafe_study/mod.rs:84:1
[INFO] [stderr]    |
[INFO] [stderr] 84 | const MAX_POINTS: u32 = 100_000;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static is never used: `HELLO_WORLD`
[INFO] [stderr]   --> src/unsafe_study/mod.rs:87:1
[INFO] [stderr]    |
[INFO] [stderr] 87 | static HELLO_WORLD: &str = "Hello, world!";
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `never_type`
[INFO] [stderr]    --> src/unsafe_study/mod.rs:212:4
[INFO] [stderr]     |
[INFO] [stderr] 212 | fn never_type() {}
[INFO] [stderr]     |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fib`
[INFO] [stderr]    --> src/main.rs:126:4
[INFO] [stderr]     |
[INFO] [stderr] 126 | fn fib(n: i32) -> i32 {
[INFO] [stderr]     |    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fib1`
[INFO] [stderr]    --> src/main.rs:143:4
[INFO] [stderr]     |
[INFO] [stderr] 143 | fn fib1(n: i32) -> i32 {
[INFO] [stderr]     |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Quit`
[INFO] [stderr]    --> src/main.rs:182:5
[INFO] [stderr]     |
[INFO] [stderr] 182 |     Quit,
[INFO] [stderr]     |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Move`
[INFO] [stderr]    --> src/main.rs:183:5
[INFO] [stderr]     |
[INFO] [stderr] 183 |     Move { x: i32, y: i32 },
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `ChangeColor`
[INFO] [stderr]    --> src/main.rs:185:5
[INFO] [stderr]     |
[INFO] [stderr] 185 |     ChangeColor(i32, i32, i32),
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Alaska`
[INFO] [stderr]    --> src/main.rs:198:5
[INFO] [stderr]     |
[INFO] [stderr] 198 |     Alaska,
[INFO] [stderr]     |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Penny`
[INFO] [stderr]    --> src/main.rs:203:5
[INFO] [stderr]     |
[INFO] [stderr] 203 |     Penny,
[INFO] [stderr]     |     ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Nickel`
[INFO] [stderr]    --> src/main.rs:204:5
[INFO] [stderr]     |
[INFO] [stderr] 204 |     Nickel,
[INFO] [stderr]     |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Dime`
[INFO] [stderr]    --> src/main.rs:205:5
[INFO] [stderr]     |
[INFO] [stderr] 205 |     Dime,
[INFO] [stderr]     |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 89 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/rust_study-6423a269d9ced9d0
[INFO] [stdout] running 1 test
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/rust_study-63be1f76dcd1940e
[INFO] [stdout] test tests::it_works ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 32 tests
[INFO] [stdout] test mini_grep::mini::test::case_insensitive ... ok
[INFO] [stdout] test asynchronous::test_async ... ok
[INFO] [stdout] test concurrent::thread_study::mutex ... ok
[INFO] [stdout] test smart_pointer::test_de_referenced_4_my_box ... ok
[INFO] [stdout] test smart_pointer::test_de_referenced_4_box ... ok
[INFO] [stdout] test concurrent::thread_study::test_thread_move ... ok
[INFO] [stdout] test mini_grep::mini::test::case_sensitive ... ok
[INFO] [stdout] test smart_pointer::test_force_de_referenced ... ok
[INFO] [stdout] test smart_pointer::test_list ... ok
[INFO] [stdout] test smart_pointer::test_drop ... ok
[INFO] [stdout] test smart_pointer::test_rc ... ok
[INFO] [stdout] test smart_pointer::test_std_mem_drop ... ok
[INFO] [stdout] test smart_pointer::tests::it_sends_an_over_75_percent_warning_message ... ok
[INFO] [stdout] test trait_study::test_notify ... ok
[INFO] [stdout] test smart_pointer::test_ref_cell ... ok
[INFO] [stdout] test unsafe_study::function_pointer::test_fn ... ok
[INFO] [stdout] test closure::call_with_different_values_v1 ... ok
[INFO] [stdout] test iterator::filters_by_size ... ok
[INFO] [stdout] test iterator::test ... ok
[INFO] [stdout] test iterator::using_other_iterator_trait_methods ... ok
[INFO] [stdout] test unsafe_study::test_unsafe ... ok
[INFO] [stdout] test unsafe_study::test_unsafe_fn ... ok
[INFO] [stdout] test unsafe_study::test_wrapper ... ok
[INFO] [stdout] test unsafe_study::test_trait ... ok
[INFO] [stdout] test unsafe_study::test_static_variable ... ok
[INFO] [stdout] test unsafe_study::test_add ... ok
[INFO] [stdout] test concurrent::thread_study::test_thread ... ok
[INFO] [stdout] test concurrent::thread_study::mutex_v1 ... ok
[INFO] [stdout] test closure::call_with_different_values ... FAILED
[INFO] [stdout] test asynchronous::timer::executor::test_executor ... ok
[INFO] [stdout] test concurrent::thread_study::test_channel ... ok
[INFO] [stderr] error: test failed, to rerun pass '--bin rust-study'
[INFO] [stdout] test asynchronous::test_syn ... ok
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- closure::call_with_different_values stdout ----
[INFO] [stdout] thread 'closure::call_with_different_values' panicked at 'assertion failed: `(left == right)`
[INFO] [stdout]   left: `1`,
[INFO] [stdout]  right: `2`', src/closure.rs:133:5
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x56080c19e4e0 - std::backtrace_rs::backtrace::libunwind::trace::h04d12fdcddff82aa
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/../../backtrace/src/backtrace/libunwind.rs:100:5
[INFO] [stdout]    1:     0x56080c19e4e0 - std::backtrace_rs::backtrace::trace_unsynchronized::h1459b974b6fbe5e1
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stdout]    2:     0x56080c19e4e0 - std::sys_common::backtrace::_print_fmt::h9b8396a669123d95
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/sys_common/backtrace.rs:67:5
[INFO] [stdout]    3:     0x56080c19e4e0 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::he009dcaaa75eed60
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/sys_common/backtrace.rs:46:22
[INFO] [stdout]    4:     0x56080c1c1c8c - core::fmt::write::h77b4746b0dea1dd3
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/core/src/fmt/mod.rs:1078:17
[INFO] [stdout]    5:     0x56080c12bf76 - std::io::Write::write_fmt::h3a40d9c04f88bb58
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/io/mod.rs:1518:15
[INFO] [stdout]    6:     0x56080c1986ad - std::io::impls::<impl std::io::Write for alloc::boxed::Box<W>>::write_fmt::h1b3d263673641f53
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/io/impls.rs:179:9
[INFO] [stdout]    7:     0x56080c1a0bb5 - std::sys_common::backtrace::_print::h2d880c9e69a21be9
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/sys_common/backtrace.rs:49:5
[INFO] [stdout]    8:     0x56080c1a0bb5 - std::sys_common::backtrace::print::h5f02b1bb49f36879
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/sys_common/backtrace.rs:36:9
[INFO] [stdout]    9:     0x56080c1a0bb5 - std::panicking::default_hook::{{closure}}::h658e288a7a809b29
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panicking.rs:208:50
[INFO] [stdout]   10:     0x56080c1a0802 - std::panicking::default_hook::hb52d73f0da9a4bb8
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panicking.rs:224:9
[INFO] [stdout]   11:     0x56080c1a1351 - std::panicking::rust_panic_with_hook::hfe7e1c684e3e6462
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panicking.rs:593:17
[INFO] [stdout]   12:     0x56080c1a0e97 - std::panicking::begin_panic_handler::{{closure}}::h42939e004b32765c
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panicking.rs:499:13
[INFO] [stdout]   13:     0x56080c19e99c - std::sys_common::backtrace::__rust_end_short_backtrace::h9d2070f7bf9fd56c
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/sys_common/backtrace.rs:141:18
[INFO] [stdout]   14:     0x56080c1a0df9 - rust_begin_unwind
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panicking.rs:495:5
[INFO] [stdout]   15:     0x56080c1a0dab - std::panicking::begin_panic_fmt::h4a7e15187eac098d
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panicking.rs:437:5
[INFO] [stdout]   16:     0x56080c10b136 - rust_study::closure::call_with_different_values::h8ee895d657e8eca1
[INFO] [stdout]                                at /opt/rustwide/workdir/src/closure.rs:133:5
[INFO] [stdout]   17:     0x56080c10af8a - rust_study::closure::call_with_different_values::{{closure}}::ha166a261bf10243f
[INFO] [stdout]                                at /opt/rustwide/workdir/src/closure.rs:127:1
[INFO] [stdout]   18:     0x56080c0ec63e - core::ops::function::FnOnce::call_once::h10851c4e0091fe9e
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/core/src/ops/function.rs:227:5
[INFO] [stdout]   19:     0x56080c153ac3 - core::ops::function::FnOnce::call_once::hdbd2235b6243db3d
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/core/src/ops/function.rs:227:5
[INFO] [stdout]   20:     0x56080c153ac3 - test::__rust_begin_short_backtrace::hb1dea1c208110812
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/test/src/lib.rs:517:5
[INFO] [stdout]   21:     0x56080c151f6a - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h5d11a40efef721f2
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/alloc/src/boxed.rs:1307:9
[INFO] [stdout]   22:     0x56080c151f6a - <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h23961df98af0bc5a
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panic.rs:322:9
[INFO] [stdout]   23:     0x56080c151f6a - std::panicking::try::do_call::h6390646e3de3fb9e
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panicking.rs:381:40
[INFO] [stdout]   24:     0x56080c151f6a - std::panicking::try::hc531439ab6159192
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panicking.rs:345:19
[INFO] [stdout]   25:     0x56080c151f6a - std::panic::catch_unwind::h859d8bdaf9b4855c
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panic.rs:396:14
[INFO] [stdout]   26:     0x56080c151f6a - test::run_test_in_process::hae60aa74417e3abc
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/test/src/lib.rs:544:18
[INFO] [stdout]   27:     0x56080c151f6a - test::run_test::run_test_inner::{{closure}}::hf48c86652c4a151d
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/test/src/lib.rs:450:39
[INFO] [stdout]   28:     0x56080c12b2f6 - std::sys_common::backtrace::__rust_begin_short_backtrace::hb82b392232b8bd1f
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/sys_common/backtrace.rs:125:18
[INFO] [stdout]   29:     0x56080c1302f3 - std::thread::Builder::spawn_unchecked::{{closure}}::{{closure}}::h79ca9e9abe157956
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/thread/mod.rs:474:17
[INFO] [stdout]   30:     0x56080c1302f3 - <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::ha12f1f228780a4f7
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panic.rs:322:9
[INFO] [stdout]   31:     0x56080c1302f3 - std::panicking::try::do_call::h722bb7416d021cdc
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panicking.rs:381:40
[INFO] [stdout]   32:     0x56080c1302f3 - std::panicking::try::h78e5abca71ac7cac
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panicking.rs:345:19
[INFO] [stdout]   33:     0x56080c1302f3 - std::panic::catch_unwind::h95162588bd0fa090
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/panic.rs:396:14
[INFO] [stdout]   34:     0x56080c1302f3 - std::thread::Builder::spawn_unchecked::{{closure}}::h64da5c4b9acc58dc
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/thread/mod.rs:473:30
[INFO] [stdout]   35:     0x56080c1302f3 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h7a8c588ad0b69edb
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/core/src/ops/function.rs:227:5
[INFO] [stdout]   36:     0x56080c1a779a - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h09ff301006f1aeca
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/alloc/src/boxed.rs:1307:9
[INFO] [stdout]   37:     0x56080c1a779a - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::he79488c8f00b5f31
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/alloc/src/boxed.rs:1307:9
[INFO] [stdout]   38:     0x56080c1a779a - std::sys::unix::thread::Thread::new::thread_start::h587efff279c68ba7
[INFO] [stdout]                                at /rustc/e1884a8e3c3e813aada8254edfa120e85bf5ffca/library/std/src/sys/unix/thread.rs:71:17
[INFO] [stdout]   39:     0x7f3b61e75609 - start_thread
[INFO] [stdout]   40:     0x7f3b61c47293 - clone
[INFO] [stdout]   41:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     closure::call_with_different_values
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 31 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "d64c84b38a82b73c5c1d1c63394cd73d44d7d4d6a740f00a4163782a4f787621", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d64c84b38a82b73c5c1d1c63394cd73d44d7d4d6a740f00a4163782a4f787621", kill_on_drop: false }`
[INFO] [stdout] d64c84b38a82b73c5c1d1c63394cd73d44d7d4d6a740f00a4163782a4f787621