[INFO] cloning repository https://github.com/lazylook2/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/lazylook2/rust_study" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flazylook2%2Frust_study", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flazylook2%2Frust_study'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dcd81ff27c0108cad15d475338dbf701848b27f2
[INFO] testing lazylook2/rust_study against beta-2021-08-01 for beta-1.55-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flazylook2%2Frust_study" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lazylook2/rust_study on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/lazylook2/rust_study
[INFO] finished tweaking git repo https://github.com/lazylook2/rust_study
[INFO] tweaked toml for git repo https://github.com/lazylook2/rust_study written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/lazylook2/rust_study already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 457896976c10d7263317997e2593337a4b01c42eeb837647c7125bd2ec07c683
[INFO] running `Command { std: "docker" "start" "-a" "457896976c10d7263317997e2593337a4b01c42eeb837647c7125bd2ec07c683", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "457896976c10d7263317997e2593337a4b01c42eeb837647c7125bd2ec07c683", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "457896976c10d7263317997e2593337a4b01c42eeb837647c7125bd2ec07c683", kill_on_drop: false }`
[INFO] [stdout] 457896976c10d7263317997e2593337a4b01c42eeb837647c7125bd2ec07c683
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d9b7cd1fefe855e5ca0e2841b2902d02b2ec8d599998659ba7469206093ff7e3
[INFO] running `Command { std: "docker" "start" "-a" "d9b7cd1fefe855e5ca0e2841b2902d02b2ec8d599998659ba7469206093ff7e3", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/concurrency.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ErrorKind`, `Error`
[INFO] [stdout]  --> src/error.rs:2:15
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{ErrorKind, Read, Error};
[INFO] [stdout]   |               ^^^^^^^^^        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `teacher` should have an upper camel case name
[INFO] [stdout]   --> src/generics_trait.rs:73:15
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub trait teacher {
[INFO] [stdout]    |               ^^^^^^^ help: convert the identifier to upper camel case: `Teacher`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/iterators_closures.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     /// 完整标注的闭包定义
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 23 |     let add_one_v2 = |x: u32| -> u32 { x + 1 };
[INFO] [stdout]    |     ------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/iterators_closures.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | /     /// 闭包定义中省略了类型注解（现在要编译器需要返回类型了，目前编译不通过）
[INFO] [stdout] 25 | |     // let add_one_v3 = |x| { x + 1 };
[INFO] [stdout] 26 | |     /// 去掉了可选的大括号（现在要编译器需要返回类型了，目前编译不通过）
[INFO] [stdout]    | |________________________________________________________________________^
[INFO] [stdout] ...
[INFO] [stdout] 29 |       let example_closure = |x| x;
[INFO] [stdout]    |       ---------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/advanced_features.rs:243:6
[INFO] [stdout]     |
[INFO] [stdout] 243 |     };
[INFO] [stdout]     |      ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]    --> src/advanced_features.rs:308:5
[INFO] [stdout]     |
[INFO] [stdout] 308 | use std::error::Error;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/common.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let y = {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `number`
[INFO] [stdout]   --> src/common.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let number = if condition {
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_number`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `user1`
[INFO] [stdout]  --> src/structs.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let user1 = User{
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `user2`
[INFO] [stdout]   --> src/structs.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let user2 = User{
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `four`
[INFO] [stdout]  --> src/enum_match.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let four = IpAddKind::V4;
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home`
[INFO] [stdout]   --> src/enum_match.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let home = IpAddr{ kind: IpAddKind::V4, address: String::from("127.0.0.1") };
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ip_type`
[INFO] [stdout]  --> src/enum_match.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 |     fn route (ip_type: IpAddKind) { }
[INFO] [stdout]   |               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ip_type`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]  --> src/collections.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let v: Vec<i32> = Vec::new();
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `first`
[INFO] [stdout]   --> src/collections.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let first = &v[0];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/collections.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     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: `s`
[INFO] [stdout]   --> src/collections.rs:57:13
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let mut s = String::new(); // String 这样拥有所有权，被移动就回不来了
[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/collections.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let s = data.to_string(); // 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/collections.rs:59:9
[INFO] [stdout]    |
[INFO] [stdout] 59 |     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/collections.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |     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: `s`
[INFO] [stdout]   --> src/collections.rs:68:9
[INFO] [stdout]    |
[INFO] [stdout] 68 |     let s = s1 + "-" + &s2; // String 和 &str。s1 被移动了，不能继续使用
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/collections.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 78 |     let hello = &s[0..5];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `world`
[INFO] [stdout]   --> src/collections.rs:79:9
[INFO] [stdout]    |
[INFO] [stdout] 79 |     let world = &s[6..11];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `slice`
[INFO] [stdout]   --> src/collections.rs:82:9
[INFO] [stdout]    |
[INFO] [stdout] 82 |     let slice = &a[1..3];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `word`
[INFO] [stdout]    --> src/collections.rs:102:9
[INFO] [stdout]     |
[INFO] [stdout] 102 |     let word = first_word(&s); // word 的值为 5
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scores`
[INFO] [stdout]    --> src/collections.rs:131:9
[INFO] [stdout]     |
[INFO] [stdout] 131 |     let scores: HashMap<_, _> = teams.iter().zip(initial_scores.iter()).collect();
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scores`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `integer`
[INFO] [stdout]   --> src/generics_trait.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let integer = Point { x: 5, y: 10 };
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_integer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item2`
[INFO] [stdout]    --> src/generics_trait.rs:108:42
[INFO] [stdout]     |
[INFO] [stdout] 108 |     pub fn notify2<T: School>(item1: &T, item2: &T) {
[INFO] [stdout]     |                                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_item2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]    --> src/generics_trait.rs:116:28
[INFO] [stdout]     |
[INFO] [stdout] 116 |     fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stdout]     |                            ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]    --> src/generics_trait.rs:116:34
[INFO] [stdout]     |
[INFO] [stdout] 116 |     fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stdout]     |                                  ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string2`
[INFO] [stdout]    --> src/generics_trait.rs:243:13
[INFO] [stdout]     |
[INFO] [stdout] 243 |         let string2 = String::from("xyz");
[INFO] [stdout]     |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_string2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/generics_trait.rs:305:9
[INFO] [stdout]     |
[INFO] [stdout] 305 |     let s: &'static str = "I have a static lifetime.";
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/generics_trait.rs:250:33
[INFO] [stdout]     |
[INFO] [stdout] 250 |     fn longest2<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout]     |                                 ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/generics_trait.rs:281:14
[INFO] [stdout]     |
[INFO] [stdout] 281 |         for (i, &item) in bytes.iter().enumerate() {
[INFO] [stdout]     |              ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `add_one_v2`
[INFO] [stdout]   --> src/iterators_closures.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let add_one_v2 = |x: u32| -> u32 { x + 1 };
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_add_one_v2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/iterators_closures.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let s = example_closure(String::from("hello"));
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/pointers.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let i = 2;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]   --> src/pointers.rs:26:31
[INFO] [stdout]    |
[INFO] [stdout] 26 |                 List::Cons(i, j) => {println!("第二层：{}", i);},
[INFO] [stdout]    |                               ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> src/pointers.rs:154:9
[INFO] [stdout]     |
[INFO] [stdout] 154 |     let c = Cons(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: `b`
[INFO] [stdout]    --> src/pointers.rs:162:9
[INFO] [stdout]     |
[INFO] [stdout] 162 |     let b = Cons(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/pointers.rs:165:13
[INFO] [stdout]     |
[INFO] [stdout] 165 |         let c = Cons(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: `a`
[INFO] [stdout]    --> src/pointers.rs:175:9
[INFO] [stdout]     |
[INFO] [stdout] 175 |     let a = AA{ aa: Rc::clone(&x), bb: 0 };
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/pointers.rs:176:9
[INFO] [stdout]     |
[INFO] [stdout] 176 |     let b = AA{ aa: Rc::clone(&x), bb: 1 };
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `branch`
[INFO] [stdout]    --> src/pointers.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |     let branch = Rc::new(
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_branch`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]    --> src/object_oriented.rs:173:31
[INFO] [stdout]     |
[INFO] [stdout] 173 |         fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]     |                               ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/patterns.rs:111:19
[INFO] [stdout]     |
[INFO] [stdout] 111 |     let Point{ x, y} = p;
[INFO] [stdout]     |                   ^ help: try ignoring the field: `y: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/patterns.rs:192:9
[INFO] [stdout]     |
[INFO] [stdout] 192 |     let y = 10;
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `slice`
[INFO] [stdout]   --> src/advanced_features.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let slice: &[i32] = unsafe {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `guess`
[INFO] [stdout]    --> src/advanced_features.rs:358:13
[INFO] [stdout]     |
[INFO] [stdout] 358 |         let guess: u32 = match guess.trim().parse() {
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_guess`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/collections.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let mut s = String::new(); // String 这样拥有所有权，被移动就回不来了
[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/error.rs:90:13
[INFO] [stdout]    |
[INFO] [stdout] 90 |         let mut guess = String::new();
[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/error.rs:48:13
[INFO] [stdout]    |
[INFO] [stdout] 48 |         let mut f = File::open("fuck.txt");
[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/pointers.rs:174:9
[INFO] [stdout]     |
[INFO] [stdout] 174 |     let mut x = Rc::new(3);
[INFO] [stdout]     |         ----^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/advanced_features.rs:79:5
[INFO] [stdout]    |
[INFO] [stdout] 68 | pub unsafe fn unsafe_rust5() {
[INFO] [stdout]    | ---------------------------- because it's nested under this `unsafe` fn
[INFO] [stdout] ...
[INFO] [stdout] 79 |     unsafe {
[INFO] [stdout]    |     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]  --> src/structs.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |         active: bool,
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user`
[INFO] [stdout]   --> src/structs.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn build_user(username: String) -> User{
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/structs.rs:65:12
[INFO] [stdout]    |
[INFO] [stdout] 65 |         fn can_hold(&self, other: &Rectangle) -> bool{
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]  --> src/enum_match.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 |     enum IpAddKind {V4,V6,}
[INFO] [stdout]   |                        ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]  --> src/enum_match.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |         kind: IpAddKind,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `address`
[INFO] [stdout]  --> src/enum_match.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |         address: String,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]   --> src/enum_match.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         Quit,   // 没有关联任何数据
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]   --> src/enum_match.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         Move {x: i32, y: i32},  // 包含一个匿名结构体
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ChangeColor`
[INFO] [stdout]   --> src/enum_match.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |         ChangeColor(i32, i32, i32), // 包含三个 i32
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `parse_config`
[INFO] [stdout]   --> src/collections.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 49 |     fn parse_config(args: &[String]) -> (&str, &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file1`
[INFO] [stdout]   --> src/error.rs:69:8
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn read_username_from_file1() -> Result<String, io::Error> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Guess`
[INFO] [stdout]    --> src/error.rs:104:16
[INFO] [stdout]     |
[INFO] [stdout] 104 |     pub struct Guess {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/error.rs:109:16
[INFO] [stdout]     |
[INFO] [stdout] 109 |         pub fn new(value: i32) -> Guess {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]    --> src/error.rs:117:16
[INFO] [stdout]     |
[INFO] [stdout] 117 |         pub fn value(&self) -> i32 {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/generics_trait.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |         y: T,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Option`
[INFO] [stdout]   --> src/generics_trait.rs:34:10
[INFO] [stdout]    |
[INFO] [stdout] 34 |     enum Option<T> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Result`
[INFO] [stdout]   --> src/generics_trait.rs:38:10
[INFO] [stdout]    |
[INFO] [stdout] 38 |     enum Result<T, E> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point1`
[INFO] [stdout]   --> src/generics_trait.rs:50:12
[INFO] [stdout]    |
[INFO] [stdout] 50 |     struct Point1<T, U> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `mixup`
[INFO] [stdout]   --> src/generics_trait.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 55 |         fn mixup<V, W>(self, other: Point1<V, W>) -> Point1<T, W> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify`
[INFO] [stdout]    --> src/generics_trait.rs:101:12
[INFO] [stdout]     |
[INFO] [stdout] 101 |     pub fn notify(item: impl School) {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify1`
[INFO] [stdout]    --> src/generics_trait.rs:105:12
[INFO] [stdout]     |
[INFO] [stdout] 105 |     pub fn notify1<T: School>(item: &T) {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify2`
[INFO] [stdout]    --> src/generics_trait.rs:108:12
[INFO] [stdout]     |
[INFO] [stdout] 108 |     pub fn notify2<T: School>(item1: &T, item2: &T) {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify3`
[INFO] [stdout]    --> src/generics_trait.rs:112:12
[INFO] [stdout]     |
[INFO] [stdout] 112 |     pub fn notify3<T: School + teacher>(item: T) -> String {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_function`
[INFO] [stdout]    --> src/generics_trait.rs:116:8
[INFO] [stdout]     |
[INFO] [stdout] 116 |     fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `return_school`
[INFO] [stdout]    --> src/generics_trait.rs:123:8
[INFO] [stdout]     |
[INFO] [stdout] 123 |     fn return_school() -> impl School {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest2`
[INFO] [stdout]    --> src/generics_trait.rs:250:8
[INFO] [stdout]     |
[INFO] [stdout] 250 |     fn longest2<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word`
[INFO] [stdout]    --> src/generics_trait.rs:278:8
[INFO] [stdout]     |
[INFO] [stdout] 278 |     fn first_word(s: &str) -> &str {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `announce_and_return_part`
[INFO] [stdout]    --> src/generics_trait.rs:298:12
[INFO] [stdout]     |
[INFO] [stdout] 298 |         fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest_with_an_announcement`
[INFO] [stdout]    --> src/generics_trait.rs:308:8
[INFO] [stdout]     |
[INFO] [stdout] 308 |     fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate`
[INFO] [stdout]  --> src/iterators_closures.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn calculate(a: u32) -> u32 {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_one_v1`
[INFO] [stdout]   --> src/iterators_closures.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn  add_one_v1   (x: u32) -> u32 { x + 1 }
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Cacher`
[INFO] [stdout]   --> src/iterators_closures.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |     struct Cacher<T>
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/iterators_closures.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 44 |         fn new (calculation: T) -> Cacher<T>{
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]   --> src/iterators_closures.rs:47:12
[INFO] [stdout]    |
[INFO] [stdout] 47 |         fn value (&mut self, arg: u32) -> u32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `aa`
[INFO] [stdout]    --> src/pointers.rs:173:17
[INFO] [stdout]     |
[INFO] [stdout] 173 |     struct AA { aa: Rc<i32>, bb: i32 }
[INFO] [stdout]     |                 ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `bb`
[INFO] [stdout]    --> src/pointers.rs:173:30
[INFO] [stdout]     |
[INFO] [stdout] 173 |     struct AA { aa: Rc<i32>, bb: i32 }
[INFO] [stdout]     |                              ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cons`
[INFO] [stdout]    --> src/pointers.rs:273:9
[INFO] [stdout]     |
[INFO] [stdout] 273 |         Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nil`
[INFO] [stdout]    --> src/pointers.rs:274:9
[INFO] [stdout]     |
[INFO] [stdout] 274 |         Nil,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]    --> src/pointers.rs:278:12
[INFO] [stdout]     |
[INFO] [stdout] 278 |         fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]   --> src/object_oriented.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |         width: u32,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]   --> src/object_oriented.rs:87:9
[INFO] [stdout]    |
[INFO] [stdout] 87 |         height: u32,
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `options`
[INFO] [stdout]   --> src/object_oriented.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 88 |         options: Vec<String>,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `state`
[INFO] [stdout]    --> src/object_oriented.rs:135:9
[INFO] [stdout]     |
[INFO] [stdout] 135 |         state: Option<Box<dyn State>>, // 使用Option应该是状态，可以换为其他状态还可以清空为NONE
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/object_oriented.rs:139:16
[INFO] [stdout]     |
[INFO] [stdout] 139 |         pub fn new () -> Post{
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_text`
[INFO] [stdout]    --> src/object_oriented.rs:143:16
[INFO] [stdout]     |
[INFO] [stdout] 143 |         pub fn add_text(&mut self, text: &str) {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `content`
[INFO] [stdout]    --> src/object_oriented.rs:152:16
[INFO] [stdout]     |
[INFO] [stdout] 152 |         pub fn content(&self) -> &str{
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `request_review`
[INFO] [stdout]    --> src/object_oriented.rs:155:16
[INFO] [stdout]     |
[INFO] [stdout] 155 |         pub fn request_review(&mut self){
[INFO] [stdout]     |                ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `approve`
[INFO] [stdout]    --> src/object_oriented.rs:162:16
[INFO] [stdout]     |
[INFO] [stdout] 162 |         pub fn approve(&mut self){
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> src/patterns.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]    --> src/patterns.rs:127:9
[INFO] [stdout]     |
[INFO] [stdout] 127 |         Move { x: i32, y: i32},
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]    --> src/patterns.rs:128:9
[INFO] [stdout]     |
[INFO] [stdout] 128 |         Write (String),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Rgb`
[INFO] [stdout]    --> src/patterns.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 140 |         Rgb(i32, i32, i32),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> src/patterns.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 144 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]    --> src/patterns.rs:145:9
[INFO] [stdout]     |
[INFO] [stdout] 145 |         Move { x: i32, y: i32 },
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]    --> src/patterns.rs:146:9
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Write(String),
[INFO] [stdout]     |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `split_at_mut1`
[INFO] [stdout]   --> src/advanced_features.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn split_at_mut1(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unsafe_rust6`
[INFO] [stdout]   --> src/advanced_features.rs:86:4
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn unsafe_rust6() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]    --> src/advanced_features.rs:242:9
[INFO] [stdout]     |
[INFO] [stdout] 242 |         name: String
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Result`
[INFO] [stdout]    --> src/advanced_features.rs:338:5
[INFO] [stdout]     |
[INFO] [stdout] 338 |     type Result<T> = std::result::Result<T, std::io::Error>;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Stop`
[INFO] [stdout]    --> src/advanced_features.rs:453:9
[INFO] [stdout]     |
[INFO] [stdout] 453 |         Stop,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `returns_closure`
[INFO] [stdout]    --> src/advanced_features.rs:481:8
[INFO] [stdout]     |
[INFO] [stdout] 481 |     fn returns_closure() -> Box<dyn Fn(i32) -> i32> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `String1` should have a snake case name
[INFO] [stdout]   --> src/collections.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub fn String1() {
[INFO] [stdout]    |        ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `string1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Closures` should have a snake case name
[INFO] [stdout]  --> src/iterators_closures.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn Closures() {
[INFO] [stdout]   |        ^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `closures`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Iterator` should have a snake case name
[INFO] [stdout]    --> src/iterators_closures.rs:102:8
[INFO] [stdout]     |
[INFO] [stdout] 102 | pub fn Iterator() {
[INFO] [stdout]     |        ^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `iterator`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Rc` should have a snake case name
[INFO] [stdout]    --> src/pointers.rs:143:8
[INFO] [stdout]     |
[INFO] [stdout] 143 | pub fn Rc () {
[INFO] [stdout]     |        ^^ help: convert the identifier to snake case: `rc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 120 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `advanced_functions1`
[INFO] [stdout]  --> src/main.rs:3:37
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rust_study::advanced_features::{advanced_functions1, macros1};
[INFO] [stdout]   |                                     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.47s
[INFO] running `Command { std: "docker" "inspect" "d9b7cd1fefe855e5ca0e2841b2902d02b2ec8d599998659ba7469206093ff7e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d9b7cd1fefe855e5ca0e2841b2902d02b2ec8d599998659ba7469206093ff7e3", kill_on_drop: false }`
[INFO] [stdout] d9b7cd1fefe855e5ca0e2841b2902d02b2ec8d599998659ba7469206093ff7e3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] acd514c66653edec8e87322c1e710bdbc3d0c6365dae2801121b40c69c12e70e
[INFO] running `Command { std: "docker" "start" "-a" "acd514c66653edec8e87322c1e710bdbc3d0c6365dae2801121b40c69c12e70e", kill_on_drop: false }`
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/concurrency.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ErrorKind`, `Error`
[INFO] [stdout]  --> src/error.rs:2:15
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{ErrorKind, Read, Error};
[INFO] [stdout]   |               ^^^^^^^^^        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `teacher` should have an upper camel case name
[INFO] [stdout]   --> src/generics_trait.rs:73:15
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub trait teacher {
[INFO] [stdout]    |               ^^^^^^^ help: convert the identifier to upper camel case: `Teacher`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/iterators_closures.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     /// 完整标注的闭包定义
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 23 |     let add_one_v2 = |x: u32| -> u32 { x + 1 };
[INFO] [stdout]    |     ------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/iterators_closures.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | /     /// 闭包定义中省略了类型注解（现在要编译器需要返回类型了，目前编译不通过）
[INFO] [stdout] 25 | |     // let add_one_v3 = |x| { x + 1 };
[INFO] [stdout] 26 | |     /// 去掉了可选的大括号（现在要编译器需要返回类型了，目前编译不通过）
[INFO] [stdout]    | |________________________________________________________________________^
[INFO] [stdout] ...
[INFO] [stdout] 29 |       let example_closure = |x| x;
[INFO] [stdout]    |       ---------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/advanced_features.rs:243:6
[INFO] [stdout]     |
[INFO] [stdout] 243 |     };
[INFO] [stdout]     |      ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]    --> src/advanced_features.rs:308:5
[INFO] [stdout]     |
[INFO] [stdout] 308 | use std::error::Error;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/common.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let y = {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `number`
[INFO] [stdout]   --> src/common.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let number = if condition {
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_number`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `user1`
[INFO] [stdout]  --> src/structs.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let user1 = User{
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `user2`
[INFO] [stdout]   --> src/structs.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let user2 = User{
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `four`
[INFO] [stdout]  --> src/enum_match.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let four = IpAddKind::V4;
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home`
[INFO] [stdout]   --> src/enum_match.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let home = IpAddr{ kind: IpAddKind::V4, address: String::from("127.0.0.1") };
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ip_type`
[INFO] [stdout]  --> src/enum_match.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 |     fn route (ip_type: IpAddKind) { }
[INFO] [stdout]   |               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ip_type`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]  --> src/collections.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let v: Vec<i32> = Vec::new();
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `first`
[INFO] [stdout]   --> src/collections.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let first = &v[0];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/collections.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     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: `s`
[INFO] [stdout]   --> src/collections.rs:57:13
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let mut s = String::new(); // String 这样拥有所有权，被移动就回不来了
[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/collections.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let s = data.to_string(); // 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/collections.rs:59:9
[INFO] [stdout]    |
[INFO] [stdout] 59 |     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/collections.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |     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: `s`
[INFO] [stdout]   --> src/collections.rs:68:9
[INFO] [stdout]    |
[INFO] [stdout] 68 |     let s = s1 + "-" + &s2; // String 和 &str。s1 被移动了，不能继续使用
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/collections.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 78 |     let hello = &s[0..5];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `world`
[INFO] [stdout]   --> src/collections.rs:79:9
[INFO] [stdout]    |
[INFO] [stdout] 79 |     let world = &s[6..11];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `slice`
[INFO] [stdout]   --> src/collections.rs:82:9
[INFO] [stdout]    |
[INFO] [stdout] 82 |     let slice = &a[1..3];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `word`
[INFO] [stdout]    --> src/collections.rs:102:9
[INFO] [stdout]     |
[INFO] [stdout] 102 |     let word = first_word(&s); // word 的值为 5
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scores`
[INFO] [stdout]    --> src/collections.rs:131:9
[INFO] [stdout]     |
[INFO] [stdout] 131 |     let scores: HashMap<_, _> = teams.iter().zip(initial_scores.iter()).collect();
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scores`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `integer`
[INFO] [stdout]   --> src/generics_trait.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let integer = Point { x: 5, y: 10 };
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_integer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item2`
[INFO] [stdout]    --> src/generics_trait.rs:108:42
[INFO] [stdout]     |
[INFO] [stdout] 108 |     pub fn notify2<T: School>(item1: &T, item2: &T) {
[INFO] [stdout]     |                                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_item2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]    --> src/generics_trait.rs:116:28
[INFO] [stdout]     |
[INFO] [stdout] 116 |     fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stdout]     |                            ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]    --> src/generics_trait.rs:116:34
[INFO] [stdout]     |
[INFO] [stdout] 116 |     fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stdout]     |                                  ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string2`
[INFO] [stdout]    --> src/generics_trait.rs:243:13
[INFO] [stdout]     |
[INFO] [stdout] 243 |         let string2 = String::from("xyz");
[INFO] [stdout]     |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_string2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/generics_trait.rs:305:9
[INFO] [stdout]     |
[INFO] [stdout] 305 |     let s: &'static str = "I have a static lifetime.";
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/generics_trait.rs:250:33
[INFO] [stdout]     |
[INFO] [stdout] 250 |     fn longest2<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout]     |                                 ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/generics_trait.rs:281:14
[INFO] [stdout]     |
[INFO] [stdout] 281 |         for (i, &item) in bytes.iter().enumerate() {
[INFO] [stdout]     |              ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `add_one_v2`
[INFO] [stdout]   --> src/iterators_closures.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let add_one_v2 = |x: u32| -> u32 { x + 1 };
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_add_one_v2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/iterators_closures.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let s = example_closure(String::from("hello"));
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/pointers.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let i = 2;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]   --> src/pointers.rs:26:31
[INFO] [stdout]    |
[INFO] [stdout] 26 |                 List::Cons(i, j) => {println!("第二层：{}", i);},
[INFO] [stdout]    |                               ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> src/pointers.rs:154:9
[INFO] [stdout]     |
[INFO] [stdout] 154 |     let c = Cons(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: `b`
[INFO] [stdout]    --> src/pointers.rs:162:9
[INFO] [stdout]     |
[INFO] [stdout] 162 |     let b = Cons(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/pointers.rs:165:13
[INFO] [stdout]     |
[INFO] [stdout] 165 |         let c = Cons(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: `a`
[INFO] [stdout]    --> src/pointers.rs:175:9
[INFO] [stdout]     |
[INFO] [stdout] 175 |     let a = AA{ aa: Rc::clone(&x), bb: 0 };
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/pointers.rs:176:9
[INFO] [stdout]     |
[INFO] [stdout] 176 |     let b = AA{ aa: Rc::clone(&x), bb: 1 };
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `branch`
[INFO] [stdout]    --> src/pointers.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |     let branch = Rc::new(
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_branch`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]    --> src/object_oriented.rs:173:31
[INFO] [stdout]     |
[INFO] [stdout] 173 |         fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]     |                               ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/patterns.rs:111:19
[INFO] [stdout]     |
[INFO] [stdout] 111 |     let Point{ x, y} = p;
[INFO] [stdout]     |                   ^ help: try ignoring the field: `y: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/patterns.rs:192:9
[INFO] [stdout]     |
[INFO] [stdout] 192 |     let y = 10;
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `slice`
[INFO] [stdout]   --> src/advanced_features.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let slice: &[i32] = unsafe {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `guess`
[INFO] [stdout]    --> src/advanced_features.rs:358:13
[INFO] [stdout]     |
[INFO] [stdout] 358 |         let guess: u32 = match guess.trim().parse() {
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_guess`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/collections.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let mut s = String::new(); // String 这样拥有所有权，被移动就回不来了
[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/error.rs:90:13
[INFO] [stdout]    |
[INFO] [stdout] 90 |         let mut guess = String::new();
[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/error.rs:48:13
[INFO] [stdout]    |
[INFO] [stdout] 48 |         let mut f = File::open("fuck.txt");
[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/pointers.rs:174:9
[INFO] [stdout]     |
[INFO] [stdout] 174 |     let mut x = Rc::new(3);
[INFO] [stdout]     |         ----^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/advanced_features.rs:79:5
[INFO] [stdout]    |
[INFO] [stdout] 68 | pub unsafe fn unsafe_rust5() {
[INFO] [stdout]    | ---------------------------- because it's nested under this `unsafe` fn
[INFO] [stdout] ...
[INFO] [stdout] 79 |     unsafe {
[INFO] [stdout]    |     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rust_study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]  --> src/structs.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |         active: bool,
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user`
[INFO] [stdout]   --> src/structs.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn build_user(username: String) -> User{
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/structs.rs:65:12
[INFO] [stdout]    |
[INFO] [stdout] 65 |         fn can_hold(&self, other: &Rectangle) -> bool{
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]  --> src/enum_match.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 |     enum IpAddKind {V4,V6,}
[INFO] [stdout]   |                        ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]  --> src/enum_match.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |         kind: IpAddKind,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `address`
[INFO] [stdout]  --> src/enum_match.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |         address: String,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]   --> src/enum_match.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         Quit,   // 没有关联任何数据
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]   --> src/enum_match.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         Move {x: i32, y: i32},  // 包含一个匿名结构体
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ChangeColor`
[INFO] [stdout]   --> src/enum_match.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |         ChangeColor(i32, i32, i32), // 包含三个 i32
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `parse_config`
[INFO] [stdout]   --> src/collections.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 49 |     fn parse_config(args: &[String]) -> (&str, &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file1`
[INFO] [stdout]   --> src/error.rs:69:8
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn read_username_from_file1() -> Result<String, io::Error> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Guess`
[INFO] [stdout]    --> src/error.rs:104:16
[INFO] [stdout]     |
[INFO] [stdout] 104 |     pub struct Guess {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/error.rs:109:16
[INFO] [stdout]     |
[INFO] [stdout] 109 |         pub fn new(value: i32) -> Guess {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]    --> src/error.rs:117:16
[INFO] [stdout]     |
[INFO] [stdout] 117 |         pub fn value(&self) -> i32 {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/generics_trait.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |         y: T,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Option`
[INFO] [stdout]   --> src/generics_trait.rs:34:10
[INFO] [stdout]    |
[INFO] [stdout] 34 |     enum Option<T> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Result`
[INFO] [stdout]   --> src/generics_trait.rs:38:10
[INFO] [stdout]    |
[INFO] [stdout] 38 |     enum Result<T, E> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point1`
[INFO] [stdout]   --> src/generics_trait.rs:50:12
[INFO] [stdout]    |
[INFO] [stdout] 50 |     struct Point1<T, U> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `mixup`
[INFO] [stdout]   --> src/generics_trait.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 55 |         fn mixup<V, W>(self, other: Point1<V, W>) -> Point1<T, W> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify`
[INFO] [stdout]    --> src/generics_trait.rs:101:12
[INFO] [stdout]     |
[INFO] [stdout] 101 |     pub fn notify(item: impl School) {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify1`
[INFO] [stdout]    --> src/generics_trait.rs:105:12
[INFO] [stdout]     |
[INFO] [stdout] 105 |     pub fn notify1<T: School>(item: &T) {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify2`
[INFO] [stdout]    --> src/generics_trait.rs:108:12
[INFO] [stdout]     |
[INFO] [stdout] 108 |     pub fn notify2<T: School>(item1: &T, item2: &T) {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify3`
[INFO] [stdout]    --> src/generics_trait.rs:112:12
[INFO] [stdout]     |
[INFO] [stdout] 112 |     pub fn notify3<T: School + teacher>(item: T) -> String {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_function`
[INFO] [stdout]    --> src/generics_trait.rs:116:8
[INFO] [stdout]     |
[INFO] [stdout] 116 |     fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `return_school`
[INFO] [stdout]    --> src/generics_trait.rs:123:8
[INFO] [stdout]     |
[INFO] [stdout] 123 |     fn return_school() -> impl School {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest2`
[INFO] [stdout]    --> src/generics_trait.rs:250:8
[INFO] [stdout]     |
[INFO] [stdout] 250 |     fn longest2<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word`
[INFO] [stdout]    --> src/generics_trait.rs:278:8
[INFO] [stdout]     |
[INFO] [stdout] 278 |     fn first_word(s: &str) -> &str {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `announce_and_return_part`
[INFO] [stdout]    --> src/generics_trait.rs:298:12
[INFO] [stdout]     |
[INFO] [stdout] 298 |         fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest_with_an_announcement`
[INFO] [stdout]    --> src/generics_trait.rs:308:8
[INFO] [stdout]     |
[INFO] [stdout] 308 |     fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate`
[INFO] [stdout]  --> src/iterators_closures.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn calculate(a: u32) -> u32 {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_one_v1`
[INFO] [stdout]   --> src/iterators_closures.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn  add_one_v1   (x: u32) -> u32 { x + 1 }
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Cacher`
[INFO] [stdout]   --> src/iterators_closures.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |     struct Cacher<T>
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/iterators_closures.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 44 |         fn new (calculation: T) -> Cacher<T>{
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]   --> src/iterators_closures.rs:47:12
[INFO] [stdout]    |
[INFO] [stdout] 47 |         fn value (&mut self, arg: u32) -> u32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `aa`
[INFO] [stdout]    --> src/pointers.rs:173:17
[INFO] [stdout]     |
[INFO] [stdout] 173 |     struct AA { aa: Rc<i32>, bb: i32 }
[INFO] [stdout]     |                 ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `bb`
[INFO] [stdout]    --> src/pointers.rs:173:30
[INFO] [stdout]     |
[INFO] [stdout] 173 |     struct AA { aa: Rc<i32>, bb: i32 }
[INFO] [stdout]     |                              ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cons`
[INFO] [stdout]    --> src/pointers.rs:273:9
[INFO] [stdout]     |
[INFO] [stdout] 273 |         Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nil`
[INFO] [stdout]    --> src/pointers.rs:274:9
[INFO] [stdout]     |
[INFO] [stdout] 274 |         Nil,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]    --> src/pointers.rs:278:12
[INFO] [stdout]     |
[INFO] [stdout] 278 |         fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]   --> src/object_oriented.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |         width: u32,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]   --> src/object_oriented.rs:87:9
[INFO] [stdout]    |
[INFO] [stdout] 87 |         height: u32,
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `options`
[INFO] [stdout]   --> src/object_oriented.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 88 |         options: Vec<String>,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `state`
[INFO] [stdout]    --> src/object_oriented.rs:135:9
[INFO] [stdout]     |
[INFO] [stdout] 135 |         state: Option<Box<dyn State>>, // 使用Option应该是状态，可以换为其他状态还可以清空为NONE
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/object_oriented.rs:139:16
[INFO] [stdout]     |
[INFO] [stdout] 139 |         pub fn new () -> Post{
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_text`
[INFO] [stdout]    --> src/object_oriented.rs:143:16
[INFO] [stdout]     |
[INFO] [stdout] 143 |         pub fn add_text(&mut self, text: &str) {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `content`
[INFO] [stdout]    --> src/object_oriented.rs:152:16
[INFO] [stdout]     |
[INFO] [stdout] 152 |         pub fn content(&self) -> &str{
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `request_review`
[INFO] [stdout]    --> src/object_oriented.rs:155:16
[INFO] [stdout]     |
[INFO] [stdout] 155 |         pub fn request_review(&mut self){
[INFO] [stdout]     |                ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `approve`
[INFO] [stdout]    --> src/object_oriented.rs:162:16
[INFO] [stdout]     |
[INFO] [stdout] 162 |         pub fn approve(&mut self){
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> src/patterns.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]    --> src/patterns.rs:127:9
[INFO] [stdout]     |
[INFO] [stdout] 127 |         Move { x: i32, y: i32},
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]    --> src/patterns.rs:128:9
[INFO] [stdout]     |
[INFO] [stdout] 128 |         Write (String),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Rgb`
[INFO] [stdout]    --> src/patterns.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 140 |         Rgb(i32, i32, i32),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> src/patterns.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 144 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]    --> src/patterns.rs:145:9
[INFO] [stdout]     |
[INFO] [stdout] 145 |         Move { x: i32, y: i32 },
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]    --> src/patterns.rs:146:9
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Write(String),
[INFO] [stdout]     |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `split_at_mut1`
[INFO] [stdout]   --> src/advanced_features.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn split_at_mut1(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unsafe_rust6`
[INFO] [stdout]   --> src/advanced_features.rs:86:4
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn unsafe_rust6() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]    --> src/advanced_features.rs:242:9
[INFO] [stdout]     |
[INFO] [stdout] 242 |         name: String
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Result`
[INFO] [stdout]    --> src/advanced_features.rs:338:5
[INFO] [stdout]     |
[INFO] [stdout] 338 |     type Result<T> = std::result::Result<T, std::io::Error>;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Stop`
[INFO] [stdout]    --> src/advanced_features.rs:453:9
[INFO] [stdout]     |
[INFO] [stdout] 453 |         Stop,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `returns_closure`
[INFO] [stdout]    --> src/advanced_features.rs:481:8
[INFO] [stdout]     |
[INFO] [stdout] 481 |     fn returns_closure() -> Box<dyn Fn(i32) -> i32> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `String1` should have a snake case name
[INFO] [stdout]   --> src/collections.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub fn String1() {
[INFO] [stdout]    |        ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `string1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Closures` should have a snake case name
[INFO] [stdout]  --> src/iterators_closures.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn Closures() {
[INFO] [stdout]   |        ^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `closures`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Iterator` should have a snake case name
[INFO] [stdout]    --> src/iterators_closures.rs:102:8
[INFO] [stdout]     |
[INFO] [stdout] 102 | pub fn Iterator() {
[INFO] [stdout]     |        ^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `iterator`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Rc` should have a snake case name
[INFO] [stdout]    --> src/pointers.rs:143:8
[INFO] [stdout]     |
[INFO] [stdout] 143 | pub fn Rc () {
[INFO] [stdout]     |        ^^ help: convert the identifier to snake case: `rc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 120 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `advanced_functions1`
[INFO] [stdout]  --> src/main.rs:3:37
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rust_study::advanced_features::{advanced_functions1, macros1};
[INFO] [stdout]   |                                     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `advanced_functions1`
[INFO] [stdout]  --> src/main.rs:3:37
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rust_study::advanced_features::{advanced_functions1, macros1};
[INFO] [stdout]   |                                     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/concurrency.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ErrorKind`, `Error`
[INFO] [stdout]  --> src/error.rs:2:15
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{ErrorKind, Read, Error};
[INFO] [stdout]   |               ^^^^^^^^^        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `teacher` should have an upper camel case name
[INFO] [stdout]   --> src/generics_trait.rs:73:15
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub trait teacher {
[INFO] [stdout]    |               ^^^^^^^ help: convert the identifier to upper camel case: `Teacher`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/iterators_closures.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     /// 完整标注的闭包定义
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 23 |     let add_one_v2 = |x: u32| -> u32 { x + 1 };
[INFO] [stdout]    |     ------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/iterators_closures.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | /     /// 闭包定义中省略了类型注解（现在要编译器需要返回类型了，目前编译不通过）
[INFO] [stdout] 25 | |     // let add_one_v3 = |x| { x + 1 };
[INFO] [stdout] 26 | |     /// 去掉了可选的大括号（现在要编译器需要返回类型了，目前编译不通过）
[INFO] [stdout]    | |________________________________________________________________________^
[INFO] [stdout] ...
[INFO] [stdout] 29 |       let example_closure = |x| x;
[INFO] [stdout]    |       ---------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/advanced_features.rs:243:6
[INFO] [stdout]     |
[INFO] [stdout] 243 |     };
[INFO] [stdout]     |      ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]    --> src/advanced_features.rs:308:5
[INFO] [stdout]     |
[INFO] [stdout] 308 | use std::error::Error;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/common.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let y = {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `number`
[INFO] [stdout]   --> src/common.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let number = if condition {
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_number`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `user1`
[INFO] [stdout]  --> src/structs.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let user1 = User{
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `user2`
[INFO] [stdout]   --> src/structs.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let user2 = User{
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `four`
[INFO] [stdout]  --> src/enum_match.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let four = IpAddKind::V4;
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home`
[INFO] [stdout]   --> src/enum_match.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let home = IpAddr{ kind: IpAddKind::V4, address: String::from("127.0.0.1") };
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ip_type`
[INFO] [stdout]  --> src/enum_match.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 |     fn route (ip_type: IpAddKind) { }
[INFO] [stdout]   |               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ip_type`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]  --> src/collections.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let v: Vec<i32> = Vec::new();
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `first`
[INFO] [stdout]   --> src/collections.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let first = &v[0];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/collections.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     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: `s`
[INFO] [stdout]   --> src/collections.rs:57:13
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let mut s = String::new(); // String 这样拥有所有权，被移动就回不来了
[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/collections.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let s = data.to_string(); // 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/collections.rs:59:9
[INFO] [stdout]    |
[INFO] [stdout] 59 |     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/collections.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |     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: `s`
[INFO] [stdout]   --> src/collections.rs:68:9
[INFO] [stdout]    |
[INFO] [stdout] 68 |     let s = s1 + "-" + &s2; // String 和 &str。s1 被移动了，不能继续使用
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/collections.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 78 |     let hello = &s[0..5];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `world`
[INFO] [stdout]   --> src/collections.rs:79:9
[INFO] [stdout]    |
[INFO] [stdout] 79 |     let world = &s[6..11];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `slice`
[INFO] [stdout]   --> src/collections.rs:82:9
[INFO] [stdout]    |
[INFO] [stdout] 82 |     let slice = &a[1..3];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `word`
[INFO] [stdout]    --> src/collections.rs:102:9
[INFO] [stdout]     |
[INFO] [stdout] 102 |     let word = first_word(&s); // word 的值为 5
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scores`
[INFO] [stdout]    --> src/collections.rs:131:9
[INFO] [stdout]     |
[INFO] [stdout] 131 |     let scores: HashMap<_, _> = teams.iter().zip(initial_scores.iter()).collect();
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scores`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `integer`
[INFO] [stdout]   --> src/generics_trait.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let integer = Point { x: 5, y: 10 };
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_integer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item2`
[INFO] [stdout]    --> src/generics_trait.rs:108:42
[INFO] [stdout]     |
[INFO] [stdout] 108 |     pub fn notify2<T: School>(item1: &T, item2: &T) {
[INFO] [stdout]     |                                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_item2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]    --> src/generics_trait.rs:116:28
[INFO] [stdout]     |
[INFO] [stdout] 116 |     fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stdout]     |                            ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]    --> src/generics_trait.rs:116:34
[INFO] [stdout]     |
[INFO] [stdout] 116 |     fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stdout]     |                                  ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string2`
[INFO] [stdout]    --> src/generics_trait.rs:243:13
[INFO] [stdout]     |
[INFO] [stdout] 243 |         let string2 = String::from("xyz");
[INFO] [stdout]     |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_string2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/generics_trait.rs:305:9
[INFO] [stdout]     |
[INFO] [stdout] 305 |     let s: &'static str = "I have a static lifetime.";
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/generics_trait.rs:250:33
[INFO] [stdout]     |
[INFO] [stdout] 250 |     fn longest2<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout]     |                                 ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/generics_trait.rs:281:14
[INFO] [stdout]     |
[INFO] [stdout] 281 |         for (i, &item) in bytes.iter().enumerate() {
[INFO] [stdout]     |              ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> src/tests.rs:34:17
[INFO] [stdout]    |
[INFO] [stdout] 34 |     fn greeting(name: &str) -> String {
[INFO] [stdout]    |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `add_one_v2`
[INFO] [stdout]   --> src/iterators_closures.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let add_one_v2 = |x: u32| -> u32 { x + 1 };
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_add_one_v2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/iterators_closures.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let s = example_closure(String::from("hello"));
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/pointers.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let i = 2;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]   --> src/pointers.rs:26:31
[INFO] [stdout]    |
[INFO] [stdout] 26 |                 List::Cons(i, j) => {println!("第二层：{}", i);},
[INFO] [stdout]    |                               ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> src/pointers.rs:154:9
[INFO] [stdout]     |
[INFO] [stdout] 154 |     let c = Cons(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: `b`
[INFO] [stdout]    --> src/pointers.rs:162:9
[INFO] [stdout]     |
[INFO] [stdout] 162 |     let b = Cons(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/pointers.rs:165:13
[INFO] [stdout]     |
[INFO] [stdout] 165 |         let c = Cons(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: `a`
[INFO] [stdout]    --> src/pointers.rs:175:9
[INFO] [stdout]     |
[INFO] [stdout] 175 |     let a = AA{ aa: Rc::clone(&x), bb: 0 };
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/pointers.rs:176:9
[INFO] [stdout]     |
[INFO] [stdout] 176 |     let b = AA{ aa: Rc::clone(&x), bb: 1 };
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `branch`
[INFO] [stdout]    --> src/pointers.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |     let branch = Rc::new(
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_branch`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]    --> src/object_oriented.rs:173:31
[INFO] [stdout]     |
[INFO] [stdout] 173 |         fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]     |                               ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/patterns.rs:111:19
[INFO] [stdout]     |
[INFO] [stdout] 111 |     let Point{ x, y} = p;
[INFO] [stdout]     |                   ^ help: try ignoring the field: `y: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/patterns.rs:192:9
[INFO] [stdout]     |
[INFO] [stdout] 192 |     let y = 10;
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `slice`
[INFO] [stdout]   --> src/advanced_features.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let slice: &[i32] = unsafe {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `guess`
[INFO] [stdout]    --> src/advanced_features.rs:358:13
[INFO] [stdout]     |
[INFO] [stdout] 358 |         let guess: u32 = match guess.trim().parse() {
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_guess`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/collections.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let mut s = String::new(); // String 这样拥有所有权，被移动就回不来了
[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/error.rs:90:13
[INFO] [stdout]    |
[INFO] [stdout] 90 |         let mut guess = String::new();
[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/error.rs:48:13
[INFO] [stdout]    |
[INFO] [stdout] 48 |         let mut f = File::open("fuck.txt");
[INFO] [stdout]    |             ----^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/pointers.rs:174:9
[INFO] [stdout]     |
[INFO] [stdout] 174 |     let mut x = Rc::new(3);
[INFO] [stdout]     |         ----^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/advanced_features.rs:79:5
[INFO] [stdout]    |
[INFO] [stdout] 68 | pub unsafe fn unsafe_rust5() {
[INFO] [stdout]    | ---------------------------- because it's nested under this `unsafe` fn
[INFO] [stdout] ...
[INFO] [stdout] 79 |     unsafe {
[INFO] [stdout]    |     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]  --> src/structs.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |         active: bool,
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user`
[INFO] [stdout]   --> src/structs.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn build_user(username: String) -> User{
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/structs.rs:65:12
[INFO] [stdout]    |
[INFO] [stdout] 65 |         fn can_hold(&self, other: &Rectangle) -> bool{
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]  --> src/enum_match.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 |     enum IpAddKind {V4,V6,}
[INFO] [stdout]   |                        ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]  --> src/enum_match.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |         kind: IpAddKind,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `address`
[INFO] [stdout]  --> src/enum_match.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |         address: String,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]   --> src/enum_match.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         Quit,   // 没有关联任何数据
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]   --> src/enum_match.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         Move {x: i32, y: i32},  // 包含一个匿名结构体
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ChangeColor`
[INFO] [stdout]   --> src/enum_match.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |         ChangeColor(i32, i32, i32), // 包含三个 i32
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `parse_config`
[INFO] [stdout]   --> src/collections.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 49 |     fn parse_config(args: &[String]) -> (&str, &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file1`
[INFO] [stdout]   --> src/error.rs:69:8
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn read_username_from_file1() -> Result<String, io::Error> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Guess`
[INFO] [stdout]    --> src/error.rs:104:16
[INFO] [stdout]     |
[INFO] [stdout] 104 |     pub struct Guess {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/error.rs:109:16
[INFO] [stdout]     |
[INFO] [stdout] 109 |         pub fn new(value: i32) -> Guess {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]    --> src/error.rs:117:16
[INFO] [stdout]     |
[INFO] [stdout] 117 |         pub fn value(&self) -> i32 {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/generics_trait.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |         y: T,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Option`
[INFO] [stdout]   --> src/generics_trait.rs:34:10
[INFO] [stdout]    |
[INFO] [stdout] 34 |     enum Option<T> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Result`
[INFO] [stdout]   --> src/generics_trait.rs:38:10
[INFO] [stdout]    |
[INFO] [stdout] 38 |     enum Result<T, E> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point1`
[INFO] [stdout]   --> src/generics_trait.rs:50:12
[INFO] [stdout]    |
[INFO] [stdout] 50 |     struct Point1<T, U> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `mixup`
[INFO] [stdout]   --> src/generics_trait.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 55 |         fn mixup<V, W>(self, other: Point1<V, W>) -> Point1<T, W> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify`
[INFO] [stdout]    --> src/generics_trait.rs:101:12
[INFO] [stdout]     |
[INFO] [stdout] 101 |     pub fn notify(item: impl School) {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify1`
[INFO] [stdout]    --> src/generics_trait.rs:105:12
[INFO] [stdout]     |
[INFO] [stdout] 105 |     pub fn notify1<T: School>(item: &T) {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify2`
[INFO] [stdout]    --> src/generics_trait.rs:108:12
[INFO] [stdout]     |
[INFO] [stdout] 108 |     pub fn notify2<T: School>(item1: &T, item2: &T) {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify3`
[INFO] [stdout]    --> src/generics_trait.rs:112:12
[INFO] [stdout]     |
[INFO] [stdout] 112 |     pub fn notify3<T: School + teacher>(item: T) -> String {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_function`
[INFO] [stdout]    --> src/generics_trait.rs:116:8
[INFO] [stdout]     |
[INFO] [stdout] 116 |     fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `return_school`
[INFO] [stdout]    --> src/generics_trait.rs:123:8
[INFO] [stdout]     |
[INFO] [stdout] 123 |     fn return_school() -> impl School {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest2`
[INFO] [stdout]    --> src/generics_trait.rs:250:8
[INFO] [stdout]     |
[INFO] [stdout] 250 |     fn longest2<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word`
[INFO] [stdout]    --> src/generics_trait.rs:278:8
[INFO] [stdout]     |
[INFO] [stdout] 278 |     fn first_word(s: &str) -> &str {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `announce_and_return_part`
[INFO] [stdout]    --> src/generics_trait.rs:298:12
[INFO] [stdout]     |
[INFO] [stdout] 298 |         fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest_with_an_announcement`
[INFO] [stdout]    --> src/generics_trait.rs:308:8
[INFO] [stdout]     |
[INFO] [stdout] 308 |     fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]   --> src/tests.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |         value: i32,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `expensive_test`
[INFO] [stdout]    --> src/tests.rs:102:8
[INFO] [stdout]     |
[INFO] [stdout] 102 |     fn expensive_test() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate`
[INFO] [stdout]  --> src/iterators_closures.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn calculate(a: u32) -> u32 {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_one_v1`
[INFO] [stdout]   --> src/iterators_closures.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn  add_one_v1   (x: u32) -> u32 { x + 1 }
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Cacher`
[INFO] [stdout]   --> src/iterators_closures.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |     struct Cacher<T>
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/iterators_closures.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 44 |         fn new (calculation: T) -> Cacher<T>{
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]   --> src/iterators_closures.rs:47:12
[INFO] [stdout]    |
[INFO] [stdout] 47 |         fn value (&mut self, arg: u32) -> u32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `aa`
[INFO] [stdout]    --> src/pointers.rs:173:17
[INFO] [stdout]     |
[INFO] [stdout] 173 |     struct AA { aa: Rc<i32>, bb: i32 }
[INFO] [stdout]     |                 ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `bb`
[INFO] [stdout]    --> src/pointers.rs:173:30
[INFO] [stdout]     |
[INFO] [stdout] 173 |     struct AA { aa: Rc<i32>, bb: i32 }
[INFO] [stdout]     |                              ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cons`
[INFO] [stdout]    --> src/pointers.rs:273:9
[INFO] [stdout]     |
[INFO] [stdout] 273 |         Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nil`
[INFO] [stdout]    --> src/pointers.rs:274:9
[INFO] [stdout]     |
[INFO] [stdout] 274 |         Nil,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]    --> src/pointers.rs:278:12
[INFO] [stdout]     |
[INFO] [stdout] 278 |         fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]   --> src/object_oriented.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |         width: u32,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]   --> src/object_oriented.rs:87:9
[INFO] [stdout]    |
[INFO] [stdout] 87 |         height: u32,
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `options`
[INFO] [stdout]   --> src/object_oriented.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 88 |         options: Vec<String>,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `state`
[INFO] [stdout]    --> src/object_oriented.rs:135:9
[INFO] [stdout]     |
[INFO] [stdout] 135 |         state: Option<Box<dyn State>>, // 使用Option应该是状态，可以换为其他状态还可以清空为NONE
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/object_oriented.rs:139:16
[INFO] [stdout]     |
[INFO] [stdout] 139 |         pub fn new () -> Post{
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_text`
[INFO] [stdout]    --> src/object_oriented.rs:143:16
[INFO] [stdout]     |
[INFO] [stdout] 143 |         pub fn add_text(&mut self, text: &str) {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `content`
[INFO] [stdout]    --> src/object_oriented.rs:152:16
[INFO] [stdout]     |
[INFO] [stdout] 152 |         pub fn content(&self) -> &str{
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `request_review`
[INFO] [stdout]    --> src/object_oriented.rs:155:16
[INFO] [stdout]     |
[INFO] [stdout] 155 |         pub fn request_review(&mut self){
[INFO] [stdout]     |                ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `approve`
[INFO] [stdout]    --> src/object_oriented.rs:162:16
[INFO] [stdout]     |
[INFO] [stdout] 162 |         pub fn approve(&mut self){
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> src/patterns.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]    --> src/patterns.rs:127:9
[INFO] [stdout]     |
[INFO] [stdout] 127 |         Move { x: i32, y: i32},
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]    --> src/patterns.rs:128:9
[INFO] [stdout]     |
[INFO] [stdout] 128 |         Write (String),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Rgb`
[INFO] [stdout]    --> src/patterns.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 140 |         Rgb(i32, i32, i32),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> src/patterns.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 144 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]    --> src/patterns.rs:145:9
[INFO] [stdout]     |
[INFO] [stdout] 145 |         Move { x: i32, y: i32 },
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]    --> src/patterns.rs:146:9
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Write(String),
[INFO] [stdout]     |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `split_at_mut1`
[INFO] [stdout]   --> src/advanced_features.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn split_at_mut1(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unsafe_rust6`
[INFO] [stdout]   --> src/advanced_features.rs:86:4
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn unsafe_rust6() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]    --> src/advanced_features.rs:242:9
[INFO] [stdout]     |
[INFO] [stdout] 242 |         name: String
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Result`
[INFO] [stdout]    --> src/advanced_features.rs:338:5
[INFO] [stdout]     |
[INFO] [stdout] 338 |     type Result<T> = std::result::Result<T, std::io::Error>;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Stop`
[INFO] [stdout]    --> src/advanced_features.rs:453:9
[INFO] [stdout]     |
[INFO] [stdout] 453 |         Stop,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `returns_closure`
[INFO] [stdout]    --> src/advanced_features.rs:481:8
[INFO] [stdout]     |
[INFO] [stdout] 481 |     fn returns_closure() -> Box<dyn Fn(i32) -> i32> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: cannot test inner items
[INFO] [stdout]    --> src/tests.rs:100:5
[INFO] [stdout]     |
[INFO] [stdout] 100 |     #[test]
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unnameable_test_items)]` on by default
[INFO] [stdout]     = note: this warning originates in the attribute macro `test` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `String1` should have a snake case name
[INFO] [stdout]   --> src/collections.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub fn String1() {
[INFO] [stdout]    |        ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `string1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Closures` should have a snake case name
[INFO] [stdout]  --> src/iterators_closures.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn Closures() {
[INFO] [stdout]   |        ^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `closures`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Iterator` should have a snake case name
[INFO] [stdout]    --> src/iterators_closures.rs:102:8
[INFO] [stdout]     |
[INFO] [stdout] 102 | pub fn Iterator() {
[INFO] [stdout]     |        ^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `iterator`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Rc` should have a snake case name
[INFO] [stdout]    --> src/pointers.rs:143:8
[INFO] [stdout]     |
[INFO] [stdout] 143 | pub fn Rc () {
[INFO] [stdout]     |        ^^ help: convert the identifier to snake case: `rc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 124 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.78s
[INFO] running `Command { std: "docker" "inspect" "acd514c66653edec8e87322c1e710bdbc3d0c6365dae2801121b40c69c12e70e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "acd514c66653edec8e87322c1e710bdbc3d0c6365dae2801121b40c69c12e70e", kill_on_drop: false }`
[INFO] [stdout] acd514c66653edec8e87322c1e710bdbc3d0c6365dae2801121b40c69c12e70e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] cf5985427eaf4ef55b3864cc40245da42296299913b0af2952e9926b3db08f5b
[INFO] running `Command { std: "docker" "start" "-a" "cf5985427eaf4ef55b3864cc40245da42296299913b0af2952e9926b3db08f5b", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `std::rc::Rc`
[INFO] [stderr]  --> src/concurrency.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::rc::Rc;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `ErrorKind`, `Error`
[INFO] [stderr]  --> src/error.rs:2:15
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::{ErrorKind, Read, Error};
[INFO] [stderr]   |               ^^^^^^^^^        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `teacher` should have an upper camel case name
[INFO] [stderr]   --> src/generics_trait.rs:73:15
[INFO] [stderr]    |
[INFO] [stderr] 73 |     pub trait teacher {
[INFO] [stderr]    |               ^^^^^^^ help: convert the identifier to upper camel case: `Teacher`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/iterators_closures.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 22 |     /// 完整标注的闭包定义
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 23 |     let add_one_v2 = |x: u32| -> u32 { x + 1 };
[INFO] [stderr]    |     ------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr]    = help: use `//` for a plain comment
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/iterators_closures.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 | /     /// 闭包定义中省略了类型注解（现在要编译器需要返回类型了，目前编译不通过）
[INFO] [stderr] 25 | |     // let add_one_v3 = |x| { x + 1 };
[INFO] [stderr] 26 | |     /// 去掉了可选的大括号（现在要编译器需要返回类型了，目前编译不通过）
[INFO] [stderr]    | |________________________________________________________________________^
[INFO] [stderr] ...
[INFO] [stderr] 29 |       let example_closure = |x| x;
[INFO] [stderr]    |       ---------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr]    |
[INFO] [stderr]    = help: use `//` for a plain comment
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary trailing semicolon
[INFO] [stderr]    --> src/advanced_features.rs:243:6
[INFO] [stderr]     |
[INFO] [stderr] 243 |     };
[INFO] [stderr]     |      ^ help: remove this semicolon
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::error::Error`
[INFO] [stderr]    --> src/advanced_features.rs:308:5
[INFO] [stderr]     |
[INFO] [stderr] 308 | use std::error::Error;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/common.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let y = {
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `number`
[INFO] [stderr]   --> src/common.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let number = if condition {
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_number`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user1`
[INFO] [stderr]  --> src/structs.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let user1 = User{
[INFO] [stderr]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user2`
[INFO] [stderr]   --> src/structs.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 |     let user2 = User{
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `four`
[INFO] [stderr]  --> src/enum_match.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let four = IpAddKind::V4;
[INFO] [stderr]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `home`
[INFO] [stderr]   --> src/enum_match.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let home = IpAddr{ kind: IpAddKind::V4, address: String::from("127.0.0.1") };
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ip_type`
[INFO] [stderr]  --> src/enum_match.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 |     fn route (ip_type: IpAddKind) { }
[INFO] [stderr]   |               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ip_type`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]  --> src/collections.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let v: Vec<i32> = Vec::new();
[INFO] [stderr]   |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `first`
[INFO] [stderr]   --> src/collections.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let first = &v[0];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `row`
[INFO] [stderr]   --> src/collections.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 |     let row = vec![
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:57:13
[INFO] [stderr]    |
[INFO] [stderr] 57 |     let mut s = String::new(); // String 这样拥有所有权，被移动就回不来了
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:58:9
[INFO] [stderr]    |
[INFO] [stderr] 58 |     let s = data.to_string(); // 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/collections.rs:59:9
[INFO] [stderr]    |
[INFO] [stderr] 59 |     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/collections.rs:60:9
[INFO] [stderr]    |
[INFO] [stderr] 60 |     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: `s`
[INFO] [stderr]   --> src/collections.rs:68:9
[INFO] [stderr]    |
[INFO] [stderr] 68 |     let s = s1 + "-" + &s2; // String 和 &str。s1 被移动了，不能继续使用
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello`
[INFO] [stderr]   --> src/collections.rs:78:9
[INFO] [stderr]    |
[INFO] [stderr] 78 |     let hello = &s[0..5];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `world`
[INFO] [stderr]   --> src/collections.rs:79:9
[INFO] [stderr]    |
[INFO] [stderr] 79 |     let world = &s[6..11];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice`
[INFO] [stderr]   --> src/collections.rs:82:9
[INFO] [stderr]    |
[INFO] [stderr] 82 |     let slice = &a[1..3];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `word`
[INFO] [stderr]    --> src/collections.rs:102:9
[INFO] [stderr]     |
[INFO] [stderr] 102 |     let word = first_word(&s); // word 的值为 5
[INFO] [stderr]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `scores`
[INFO] [stderr]    --> src/collections.rs:131:9
[INFO] [stderr]     |
[INFO] [stderr] 131 |     let scores: HashMap<_, _> = teams.iter().zip(initial_scores.iter()).collect();
[INFO] [stderr]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scores`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `integer`
[INFO] [stderr]   --> src/generics_trait.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 |     let integer = Point { x: 5, y: 10 };
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_integer`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `item2`
[INFO] [stderr]    --> src/generics_trait.rs:108:42
[INFO] [stderr]     |
[INFO] [stderr] 108 |     pub fn notify2<T: School>(item1: &T, item2: &T) {
[INFO] [stderr]     |                                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_item2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `t`
[INFO] [stderr]    --> src/generics_trait.rs:116:28
[INFO] [stderr]     |
[INFO] [stderr] 116 |     fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stderr]     |                            ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `u`
[INFO] [stderr]    --> src/generics_trait.rs:116:34
[INFO] [stderr]     |
[INFO] [stderr] 116 |     fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stderr]     |                                  ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `string2`
[INFO] [stderr]    --> src/generics_trait.rs:243:13
[INFO] [stderr]     |
[INFO] [stderr] 243 |         let string2 = String::from("xyz");
[INFO] [stderr]     |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_string2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]    --> src/generics_trait.rs:305:9
[INFO] [stderr]     |
[INFO] [stderr] 305 |     let s: &'static str = "I have a static lifetime.";
[INFO] [stderr]     |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]    --> src/generics_trait.rs:250:33
[INFO] [stderr]     |
[INFO] [stderr] 250 |     fn longest2<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stderr]     |                                 ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/generics_trait.rs:281:14
[INFO] [stderr]     |
[INFO] [stderr] 281 |         for (i, &item) in bytes.iter().enumerate() {
[INFO] [stderr]     |              ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `add_one_v2`
[INFO] [stderr]   --> src/iterators_closures.rs:23:9
[INFO] [stderr]    |
[INFO] [stderr] 23 |     let add_one_v2 = |x: u32| -> u32 { x + 1 };
[INFO] [stderr]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_add_one_v2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/iterators_closures.rs:31:9
[INFO] [stderr]    |
[INFO] [stderr] 31 |     let s = example_closure(String::from("hello"));
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/pointers.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |     let i = 2;
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `j`
[INFO] [stderr]   --> src/pointers.rs:26:31
[INFO] [stderr]    |
[INFO] [stderr] 26 |                 List::Cons(i, j) => {println!("第二层：{}", i);},
[INFO] [stderr]    |                               ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]    --> src/pointers.rs:154:9
[INFO] [stderr]     |
[INFO] [stderr] 154 |     let c = Cons(4, Rc::clone(&a));
[INFO] [stderr]     |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]    --> src/pointers.rs:162:9
[INFO] [stderr]     |
[INFO] [stderr] 162 |     let b = Cons(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/pointers.rs:165:13
[INFO] [stderr]     |
[INFO] [stderr] 165 |         let c = Cons(4, Rc::clone(&a));
[INFO] [stderr]     |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/pointers.rs:175:9
[INFO] [stderr]     |
[INFO] [stderr] 175 |     let a = AA{ aa: Rc::clone(&x), bb: 0 };
[INFO] [stderr]     |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]    --> src/pointers.rs:176:9
[INFO] [stderr]     |
[INFO] [stderr] 176 |     let b = AA{ aa: Rc::clone(&x), bb: 1 };
[INFO] [stderr]     |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `branch`
[INFO] [stderr]    --> src/pointers.rs:294:9
[INFO] [stderr]     |
[INFO] [stderr] 294 |     let branch = Rc::new(
[INFO] [stderr]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_branch`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `post`
[INFO] [stderr]    --> src/object_oriented.rs:173:31
[INFO] [stderr]     |
[INFO] [stderr] 173 |         fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stderr]     |                               ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]    --> src/patterns.rs:111:19
[INFO] [stderr]     |
[INFO] [stderr] 111 |     let Point{ x, y} = p;
[INFO] [stderr]     |                   ^ help: try ignoring the field: `y: _`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]    --> src/patterns.rs:192:9
[INFO] [stderr]     |
[INFO] [stderr] 192 |     let y = 10;
[INFO] [stderr]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice`
[INFO] [stderr]   --> src/advanced_features.rs:52:9
[INFO] [stderr]    |
[INFO] [stderr] 52 |     let slice: &[i32] = unsafe {
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `guess`
[INFO] [stderr]    --> src/advanced_features.rs:358:13
[INFO] [stderr]     |
[INFO] [stderr] 358 |         let guess: u32 = match guess.trim().parse() {
[INFO] [stderr]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_guess`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/collections.rs:57:9
[INFO] [stderr]    |
[INFO] [stderr] 57 |     let mut s = String::new(); // String 这样拥有所有权，被移动就回不来了
[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/error.rs:90:13
[INFO] [stderr]    |
[INFO] [stderr] 90 |         let mut guess = String::new();
[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/error.rs:48:13
[INFO] [stderr]    |
[INFO] [stderr] 48 |         let mut f = File::open("fuck.txt");
[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/pointers.rs:174:9
[INFO] [stderr]     |
[INFO] [stderr] 174 |     let mut x = Rc::new(3);
[INFO] [stderr]     |         ----^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]   --> src/advanced_features.rs:79:5
[INFO] [stderr]    |
[INFO] [stderr] 68 | pub unsafe fn unsafe_rust5() {
[INFO] [stderr]    | ---------------------------- because it's nested under this `unsafe` fn
[INFO] [stderr] ...
[INFO] [stderr] 79 |     unsafe {
[INFO] [stderr]    |     ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `active`
[INFO] [stderr]  --> src/structs.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |         active: bool,
[INFO] [stderr]   |         ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `build_user`
[INFO] [stderr]   --> src/structs.rs:23:8
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn build_user(username: String) -> User{
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `can_hold`
[INFO] [stderr]   --> src/structs.rs:65:12
[INFO] [stderr]    |
[INFO] [stderr] 65 |         fn can_hold(&self, other: &Rectangle) -> bool{
[INFO] [stderr]    |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V6`
[INFO] [stderr]  --> src/enum_match.rs:2:24
[INFO] [stderr]   |
[INFO] [stderr] 2 |     enum IpAddKind {V4,V6,}
[INFO] [stderr]   |                        ^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `kind`
[INFO] [stderr]  --> src/enum_match.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |         kind: IpAddKind,
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `address`
[INFO] [stderr]  --> src/enum_match.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |         address: String,
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Quit`
[INFO] [stderr]   --> src/enum_match.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |         Quit,   // 没有关联任何数据
[INFO] [stderr]    |         ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Move`
[INFO] [stderr]   --> src/enum_match.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |         Move {x: i32, y: i32},  // 包含一个匿名结构体
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `ChangeColor`
[INFO] [stderr]   --> src/enum_match.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |         ChangeColor(i32, i32, i32), // 包含三个 i32
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_config`
[INFO] [stderr]   --> src/collections.rs:49:8
[INFO] [stderr]    |
[INFO] [stderr] 49 |     fn parse_config(args: &[String]) -> (&str, &str) {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file1`
[INFO] [stderr]   --> src/error.rs:69:8
[INFO] [stderr]    |
[INFO] [stderr] 69 |     fn read_username_from_file1() -> Result<String, io::Error> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Guess`
[INFO] [stderr]    --> src/error.rs:104:16
[INFO] [stderr]     |
[INFO] [stderr] 104 |     pub struct Guess {
[INFO] [stderr]     |                ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]    --> src/error.rs:109:16
[INFO] [stderr]     |
[INFO] [stderr] 109 |         pub fn new(value: i32) -> Guess {
[INFO] [stderr]     |                ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `value`
[INFO] [stderr]    --> src/error.rs:117:16
[INFO] [stderr]     |
[INFO] [stderr] 117 |         pub fn value(&self) -> i32 {
[INFO] [stderr]     |                ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `y`
[INFO] [stderr]   --> src/generics_trait.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |         y: T,
[INFO] [stderr]    |         ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Option`
[INFO] [stderr]   --> src/generics_trait.rs:34:10
[INFO] [stderr]    |
[INFO] [stderr] 34 |     enum Option<T> {
[INFO] [stderr]    |          ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Result`
[INFO] [stderr]   --> src/generics_trait.rs:38:10
[INFO] [stderr]    |
[INFO] [stderr] 38 |     enum Result<T, E> {
[INFO] [stderr]    |          ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Point1`
[INFO] [stderr]   --> src/generics_trait.rs:50:12
[INFO] [stderr]    |
[INFO] [stderr] 50 |     struct Point1<T, U> {
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `mixup`
[INFO] [stderr]   --> src/generics_trait.rs:55:12
[INFO] [stderr]    |
[INFO] [stderr] 55 |         fn mixup<V, W>(self, other: Point1<V, W>) -> Point1<T, W> {
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `notify`
[INFO] [stderr]    --> src/generics_trait.rs:101:12
[INFO] [stderr]     |
[INFO] [stderr] 101 |     pub fn notify(item: impl School) {
[INFO] [stderr]     |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `notify1`
[INFO] [stderr]    --> src/generics_trait.rs:105:12
[INFO] [stderr]     |
[INFO] [stderr] 105 |     pub fn notify1<T: School>(item: &T) {
[INFO] [stderr]     |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `notify2`
[INFO] [stderr]    --> src/generics_trait.rs:108:12
[INFO] [stderr]     |
[INFO] [stderr] 108 |     pub fn notify2<T: School>(item1: &T, item2: &T) {
[INFO] [stderr]     |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `notify3`
[INFO] [stderr]    --> src/generics_trait.rs:112:12
[INFO] [stderr]     |
[INFO] [stderr] 112 |     pub fn notify3<T: School + teacher>(item: T) -> String {
[INFO] [stderr]     |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `some_function`
[INFO] [stderr]    --> src/generics_trait.rs:116:8
[INFO] [stderr]     |
[INFO] [stderr] 116 |     fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stderr]     |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `return_school`
[INFO] [stderr]    --> src/generics_trait.rs:123:8
[INFO] [stderr]     |
[INFO] [stderr] 123 |     fn return_school() -> impl School {
[INFO] [stderr]     |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest2`
[INFO] [stderr]    --> src/generics_trait.rs:250:8
[INFO] [stderr]     |
[INFO] [stderr] 250 |     fn longest2<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stderr]     |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first_word`
[INFO] [stderr]    --> src/generics_trait.rs:278:8
[INFO] [stderr]     |
[INFO] [stderr] 278 |     fn first_word(s: &str) -> &str {
[INFO] [stderr]     |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `announce_and_return_part`
[INFO] [stderr]    --> src/generics_trait.rs:298:12
[INFO] [stderr]     |
[INFO] [stderr] 298 |         fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stderr]     |            ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest_with_an_announcement`
[INFO] [stderr]    --> src/generics_trait.rs:308:8
[INFO] [stderr]     |
[INFO] [stderr] 308 |     fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calculate`
[INFO] [stderr]  --> src/iterators_closures.rs:6:8
[INFO] [stderr]   |
[INFO] [stderr] 6 |     fn calculate(a: u32) -> u32 {
[INFO] [stderr]   |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add_one_v1`
[INFO] [stderr]   --> src/iterators_closures.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |     fn  add_one_v1   (x: u32) -> u32 { x + 1 }
[INFO] [stderr]    |         ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Cacher`
[INFO] [stderr]   --> src/iterators_closures.rs:36:12
[INFO] [stderr]    |
[INFO] [stderr] 36 |     struct Cacher<T>
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/iterators_closures.rs:44:12
[INFO] [stderr]    |
[INFO] [stderr] 44 |         fn new (calculation: T) -> Cacher<T>{
[INFO] [stderr]    |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `value`
[INFO] [stderr]   --> src/iterators_closures.rs:47:12
[INFO] [stderr]    |
[INFO] [stderr] 47 |         fn value (&mut self, arg: u32) -> u32 {
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `aa`
[INFO] [stderr]    --> src/pointers.rs:173:17
[INFO] [stderr]     |
[INFO] [stderr] 173 |     struct AA { aa: Rc<i32>, bb: i32 }
[INFO] [stderr]     |                 ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `bb`
[INFO] [stderr]    --> src/pointers.rs:173:30
[INFO] [stderr]     |
[INFO] [stderr] 173 |     struct AA { aa: Rc<i32>, bb: i32 }
[INFO] [stderr]     |                              ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Cons`
[INFO] [stderr]    --> src/pointers.rs:273:9
[INFO] [stderr]     |
[INFO] [stderr] 273 |         Cons(i32, RefCell<Rc<List>>),
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Nil`
[INFO] [stderr]    --> src/pointers.rs:274:9
[INFO] [stderr]     |
[INFO] [stderr] 274 |         Nil,
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `tail`
[INFO] [stderr]    --> src/pointers.rs:278:12
[INFO] [stderr]     |
[INFO] [stderr] 278 |         fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stderr]     |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `width`
[INFO] [stderr]   --> src/object_oriented.rs:86:9
[INFO] [stderr]    |
[INFO] [stderr] 86 |         width: u32,
[INFO] [stderr]    |         ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `height`
[INFO] [stderr]   --> src/object_oriented.rs:87:9
[INFO] [stderr]    |
[INFO] [stderr] 87 |         height: u32,
[INFO] [stderr]    |         ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `options`
[INFO] [stderr]   --> src/object_oriented.rs:88:9
[INFO] [stderr]    |
[INFO] [stderr] 88 |         options: Vec<String>,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `state`
[INFO] [stderr]    --> src/object_oriented.rs:135:9
[INFO] [stderr]     |
[INFO] [stderr] 135 |         state: Option<Box<dyn State>>, // 使用Option应该是状态，可以换为其他状态还可以清空为NONE
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]    --> src/object_oriented.rs:139:16
[INFO] [stderr]     |
[INFO] [stderr] 139 |         pub fn new () -> Post{
[INFO] [stderr]     |                ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `add_text`
[INFO] [stderr]    --> src/object_oriented.rs:143:16
[INFO] [stderr]     |
[INFO] [stderr] 143 |         pub fn add_text(&mut self, text: &str) {
[INFO] [stderr]     |                ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `content`
[INFO] [stderr]    --> src/object_oriented.rs:152:16
[INFO] [stderr]     |
[INFO] [stderr] 152 |         pub fn content(&self) -> &str{
[INFO] [stderr]     |                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `request_review`
[INFO] [stderr]    --> src/object_oriented.rs:155:16
[INFO] [stderr]     |
[INFO] [stderr] 155 |         pub fn request_review(&mut self){
[INFO] [stderr]     |                ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `approve`
[INFO] [stderr]    --> src/object_oriented.rs:162:16
[INFO] [stderr]     |
[INFO] [stderr] 162 |         pub fn approve(&mut self){
[INFO] [stderr]     |                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Quit`
[INFO] [stderr]    --> src/patterns.rs:126:9
[INFO] [stderr]     |
[INFO] [stderr] 126 |         Quit,
[INFO] [stderr]     |         ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Move`
[INFO] [stderr]    --> src/patterns.rs:127:9
[INFO] [stderr]     |
[INFO] [stderr] 127 |         Move { x: i32, y: i32},
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Write`
[INFO] [stderr]    --> src/patterns.rs:128:9
[INFO] [stderr]     |
[INFO] [stderr] 128 |         Write (String),
[INFO] [stderr]     |         ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Rgb`
[INFO] [stderr]    --> src/patterns.rs:140:9
[INFO] [stderr]     |
[INFO] [stderr] 140 |         Rgb(i32, i32, i32),
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Quit`
[INFO] [stderr]    --> src/patterns.rs:144:9
[INFO] [stderr]     |
[INFO] [stderr] 144 |         Quit,
[INFO] [stderr]     |         ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Move`
[INFO] [stderr]    --> src/patterns.rs:145:9
[INFO] [stderr]     |
[INFO] [stderr] 145 |         Move { x: i32, y: i32 },
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Write`
[INFO] [stderr]    --> src/patterns.rs:146:9
[INFO] [stderr]     |
[INFO] [stderr] 146 |         Write(String),
[INFO] [stderr]     |         ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `split_at_mut1`
[INFO] [stderr]   --> src/advanced_features.rs:30:12
[INFO] [stderr]    |
[INFO] [stderr] 30 |     pub fn split_at_mut1(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stderr]    |            ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `unsafe_rust6`
[INFO] [stderr]   --> src/advanced_features.rs:86:4
[INFO] [stderr]    |
[INFO] [stderr] 86 | fn unsafe_rust6() {
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `name`
[INFO] [stderr]    --> src/advanced_features.rs:242:9
[INFO] [stderr]     |
[INFO] [stderr] 242 |         name: String
[INFO] [stderr]     |         ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `Result`
[INFO] [stderr]    --> src/advanced_features.rs:338:5
[INFO] [stderr]     |
[INFO] [stderr] 338 |     type Result<T> = std::result::Result<T, std::io::Error>;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Stop`
[INFO] [stderr]    --> src/advanced_features.rs:453:9
[INFO] [stderr]     |
[INFO] [stderr] 453 |         Stop,
[INFO] [stderr]     |         ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `returns_closure`
[INFO] [stderr]    --> src/advanced_features.rs:481:8
[INFO] [stderr]     |
[INFO] [stderr] 481 |     fn returns_closure() -> Box<dyn Fn(i32) -> i32> {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `String1` should have a snake case name
[INFO] [stderr]   --> src/collections.rs:55:8
[INFO] [stderr]    |
[INFO] [stderr] 55 | pub fn String1() {
[INFO] [stderr]    |        ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `string1`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `Closures` should have a snake case name
[INFO] [stderr]  --> src/iterators_closures.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn Closures() {
[INFO] [stderr]   |        ^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `closures`
[INFO] [stderr] 
[INFO] [stderr] warning: function `Iterator` should have a snake case name
[INFO] [stderr]    --> src/iterators_closures.rs:102:8
[INFO] [stderr]     |
[INFO] [stderr] 102 | pub fn Iterator() {
[INFO] [stderr]     |        ^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `iterator`
[INFO] [stderr] 
[INFO] [stderr] warning: function `Rc` should have a snake case name
[INFO] [stderr]    --> src/pointers.rs:143:8
[INFO] [stderr]     |
[INFO] [stderr] 143 | pub fn Rc () {
[INFO] [stderr]     |        ^^ help: convert the identifier to snake case: `rc`
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_study` (lib) generated 120 warnings
[INFO] [stderr] warning: unused variable: `name`
[INFO] [stderr]   --> src/tests.rs:34:17
[INFO] [stderr]    |
[INFO] [stderr] 34 |     fn greeting(name: &str) -> String {
[INFO] [stderr]    |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `value`
[INFO] [stderr]   --> src/tests.rs:49:9
[INFO] [stderr]    |
[INFO] [stderr] 49 |         value: i32,
[INFO] [stderr]    |         ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `expensive_test`
[INFO] [stderr]    --> src/tests.rs:102:8
[INFO] [stderr]     |
[INFO] [stderr] 102 |     fn expensive_test() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: cannot test inner items
[INFO] [stderr]    --> src/tests.rs:100:5
[INFO] [stderr]     |
[INFO] [stderr] 100 |     #[test]
[INFO] [stderr]     |     ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unnameable_test_items)]` on by default
[INFO] [stderr]     = note: this warning originates in the attribute macro `test` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `advanced_functions1`
[INFO] [stderr]  --> src/main.rs:3:37
[INFO] [stderr]   |
[INFO] [stderr] 3 | use rust_study::advanced_features::{advanced_functions1, macros1};
[INFO] [stderr]   |                                     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_study` (lib test) generated 124 warnings (120 duplicates)
[INFO] [stderr] warning: `rust_study` (bin "rust_study") generated 1 warning
[INFO] [stderr] warning: `rust_study` (bin "rust_study" test) generated 1 warning (1 duplicate)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_study-1afc0088ab9fb4eb)
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test tests::tests::larger_can_hold_smaller ... ok
[INFO] [stdout] test tests::tests::test_return ... ok
[INFO] [stdout] test tests::tests::it_works ... ok
[INFO] [stderr] error: test failed, to rerun pass '--lib'
[INFO] [stdout] test tests::tests::greater_than_100 - should panic ... ok
[INFO] [stdout] test tests::tests::greeting_contains_name ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- tests::tests::greeting_contains_name stdout ----
[INFO] [stdout] thread 'tests::tests::greeting_contains_name' panicked at 'Greeting did not contain name, value was `Hello!`', src/tests.rs:42:9
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x557b7fc799c0 - std::backtrace_rs::backtrace::libunwind::trace::hff4d1766e93f64f1
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
[INFO] [stdout]    1:     0x557b7fc799c0 - std::backtrace_rs::backtrace::trace_unsynchronized::h56bbc8eb78770bcb
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stdout]    2:     0x557b7fc799c0 - std::sys_common::backtrace::_print_fmt::h5c8e75464faca780
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/sys_common/backtrace.rs:67:5
[INFO] [stdout]    3:     0x557b7fc799c0 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h48b88277def8b362
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/sys_common/backtrace.rs:46:22
[INFO] [stdout]    4:     0x557b7fc9c18c - core::fmt::write::h3381b3176fe2b3d3
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/core/src/fmt/mod.rs:1115:17
[INFO] [stdout]    5:     0x557b7fc76925 - std::io::Write::write_fmt::h5f34a676f60246b5
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/io/mod.rs:1665:15
[INFO] [stdout]    6:     0x557b7fc7bb3b - std::sys_common::backtrace::_print::ha537687d6c17dd0d
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/sys_common/backtrace.rs:49:5
[INFO] [stdout]    7:     0x557b7fc7bb3b - std::sys_common::backtrace::print::h61376ae57d131d72
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/sys_common/backtrace.rs:36:9
[INFO] [stdout]    8:     0x557b7fc7bb3b - std::panicking::default_hook::{{closure}}::h0f7208c0b9644a54
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panicking.rs:208:50
[INFO] [stdout]    9:     0x557b7fc7b64c - std::panicking::default_hook::hdac7fc06578c14ce
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panicking.rs:222:9
[INFO] [stdout]   10:     0x557b7fc7c204 - std::panicking::rust_panic_with_hook::h72b21c283da3d1ef
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panicking.rs:622:17
[INFO] [stdout]   11:     0x557b7fc7bce7 - std::panicking::begin_panic_handler::{{closure}}::he5778f1729cff84a
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panicking.rs:519:13
[INFO] [stdout]   12:     0x557b7fc79e9c - std::sys_common::backtrace::__rust_end_short_backtrace::h2d11ca8b453b4b1d
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/sys_common/backtrace.rs:141:18
[INFO] [stdout]   13:     0x557b7fc7bc49 - rust_begin_unwind
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panicking.rs:515:5
[INFO] [stdout]   14:     0x557b7fc24c7b - std::panicking::begin_panic_fmt::h746518bde832d259
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panicking.rs:457:5
[INFO] [stdout]   15:     0x557b7fc28574 - rust_study::tests::tests::greeting_contains_name::ha0a632bcc76a2d15
[INFO] [stdout]                                at /opt/rustwide/workdir/src/tests.rs:42:9
[INFO] [stdout]   16:     0x557b7fc2843a - rust_study::tests::tests::greeting_contains_name::{{closure}}::h0efd2fef7e4a4cce
[INFO] [stdout]                                at /opt/rustwide/workdir/src/tests.rs:39:5
[INFO] [stdout]   17:     0x557b7fc2a9ce - core::ops::function::FnOnce::call_once::hfe0b3d2d41904d4b
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/core/src/ops/function.rs:227:5
[INFO] [stdout]   18:     0x557b7fc5e283 - core::ops::function::FnOnce::call_once::hbb52c4519d3137b0
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/core/src/ops/function.rs:227:5
[INFO] [stdout]   19:     0x557b7fc5e283 - test::__rust_begin_short_backtrace::h86fe3a2a5a5121af
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/test/src/lib.rs:578:5
[INFO] [stdout]   20:     0x557b7fc5cd38 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hfd956bc3d57399be
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/alloc/src/boxed.rs:1572:9
[INFO] [stdout]   21:     0x557b7fc5cd38 - <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h40dc93e0ddb5938a
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panic.rs:347:9
[INFO] [stdout]   22:     0x557b7fc5cd38 - std::panicking::try::do_call::h90d07750cb47c562
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panicking.rs:401:40
[INFO] [stdout]   23:     0x557b7fc5cd38 - std::panicking::try::h063c84733ad2a629
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panicking.rs:365:19
[INFO] [stdout]   24:     0x557b7fc5cd38 - std::panic::catch_unwind::h0c464836a84e7c08
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panic.rs:434:14
[INFO] [stdout]   25:     0x557b7fc5cd38 - test::run_test_in_process::h5cb06ef620b157fc
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/test/src/lib.rs:601:18
[INFO] [stdout]   26:     0x557b7fc5cd38 - test::run_test::run_test_inner::{{closure}}::h76f677f4b93f9828
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/test/src/lib.rs:493:39
[INFO] [stdout]   27:     0x557b7fc2b4cd - test::run_test::run_test_inner::{{closure}}::h366d01fe04f4d67a
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/test/src/lib.rs:520:37
[INFO] [stdout]   28:     0x557b7fc2b4cd - std::sys_common::backtrace::__rust_begin_short_backtrace::h7dfa0de4eb395af2
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/sys_common/backtrace.rs:125:18
[INFO] [stdout]   29:     0x557b7fc2fc98 - std::thread::Builder::spawn_unchecked::{{closure}}::{{closure}}::hf0a74bb58798037f
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/thread/mod.rs:476:17
[INFO] [stdout]   30:     0x557b7fc2fc98 - <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::hb024e854818586ac
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panic.rs:347:9
[INFO] [stdout]   31:     0x557b7fc2fc98 - std::panicking::try::do_call::hb2dd9f1d0d48e41d
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panicking.rs:401:40
[INFO] [stdout]   32:     0x557b7fc2fc98 - std::panicking::try::h4717ae7bac8b2bf3
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panicking.rs:365:19
[INFO] [stdout]   33:     0x557b7fc2fc98 - std::panic::catch_unwind::h0dc8a061326ce8d8
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/panic.rs:434:14
[INFO] [stdout]   34:     0x557b7fc2fc98 - std::thread::Builder::spawn_unchecked::{{closure}}::haa369e2d6fd00aa1
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/thread/mod.rs:475:30
[INFO] [stdout]   35:     0x557b7fc2fc98 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h36dcf3de8b056f17
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/core/src/ops/function.rs:227:5
[INFO] [stdout]   36:     0x557b7fc80d77 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h65c29e4642be2358
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/alloc/src/boxed.rs:1572:9
[INFO] [stdout]   37:     0x557b7fc80d77 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hd0f8f7fbbd9fffbf
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/alloc/src/boxed.rs:1572:9
[INFO] [stdout]   38:     0x557b7fc80d77 - std::sys::unix::thread::Thread::new::thread_start::h2fd22fee3ca77b65
[INFO] [stdout]                                at /rustc/53fd98ca776cb875bc9e5514f56b52eb74f9e7a9/library/std/src/sys/unix/thread.rs:74:17
[INFO] [stdout]   39:     0x7f030fa94609 - start_thread
[INFO] [stdout]   40:     0x7f030f866293 - clone
[INFO] [stdout]   41:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     tests::tests::greeting_contains_name
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 4 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.05s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "cf5985427eaf4ef55b3864cc40245da42296299913b0af2952e9926b3db08f5b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cf5985427eaf4ef55b3864cc40245da42296299913b0af2952e9926b3db08f5b", kill_on_drop: false }`
[INFO] [stdout] cf5985427eaf4ef55b3864cc40245da42296299913b0af2952e9926b3db08f5b
