[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 1.69.0 for beta-1.70-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flazylook2%2Frust_study" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lazylook2/rust_study on toolchain 1.69.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.69.0" "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-6-tc1/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: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.69.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b9a3911876b8d3cab06d2a6c9c98b2e819682097d222e2f1b1a7c802e4b4b419
[INFO] running `Command { std: "docker" "start" "-a" "b9a3911876b8d3cab06d2a6c9c98b2e819682097d222e2f1b1a7c802e4b4b419", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b9a3911876b8d3cab06d2a6c9c98b2e819682097d222e2f1b1a7c802e4b4b419", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b9a3911876b8d3cab06d2a6c9c98b2e819682097d222e2f1b1a7c802e4b4b419", kill_on_drop: false }`
[INFO] [stdout] b9a3911876b8d3cab06d2a6c9c98b2e819682097d222e2f1b1a7c802e4b4b419
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9860c9ad4d931c4dfbd37ed8c82e27f3e57bf802b19d6dcc242d39ce5236dc31
[INFO] running `Command { std: "docker" "start" "-a" "9860c9ad4d931c4dfbd37ed8c82e27f3e57bf802b19d6dcc242d39ce5236dc31", 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]    = help: use `//` for a plain comment
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[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: field `active` is never read
[INFO] [stdout]  --> src/structs.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     struct User {
[INFO] [stdout]   |            ---- field in this struct
[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 `build_user` is never used
[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: method `can_hold` is never used
[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 `V6` is never constructed
[INFO] [stdout]  --> src/enum_match.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 |     enum IpAddKind {V4,V6,}
[INFO] [stdout]   |          ---------     ^^
[INFO] [stdout]   |          |
[INFO] [stdout]   |          variant in this enum
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `kind` and `address` are never read
[INFO] [stdout]  --> src/enum_match.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     struct IpAddr {
[INFO] [stdout]   |            ------ fields in this struct
[INFO] [stdout] 7 |         kind: IpAddKind,
[INFO] [stdout]   |         ^^^^
[INFO] [stdout] 8 |         address: String,
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `ChangeColor` are never constructed
[INFO] [stdout]   --> src/enum_match.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     enum Message {
[INFO] [stdout]    |          ------- variants in this enum
[INFO] [stdout] 13 |         Quit,   // 没有关联任何数据
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 14 |         Move {x: i32, y: i32},  // 包含一个匿名结构体
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 15 |         Write(String),  // 包含单独一个 String
[INFO] [stdout] 16 |         ChangeColor(i32, i32, i32), // 包含三个 i32
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_config` is never used
[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 `read_username_from_file1` is never used
[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 `Guess` is never constructed
[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 `new` is never used
[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: method `value` is never used
[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 `y` is never read
[INFO] [stdout]   --> src/generics_trait.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     struct Point<T> {
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] 29 |         x: T,
[INFO] [stdout] 30 |         y: T,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Option` is never used
[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 `Result` is never used
[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 `Point1` is never constructed
[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: function `notify` is never used
[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 `notify1` is never used
[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 `notify2` is never used
[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 `notify3` is never used
[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 `some_function` is never used
[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 `return_school` is never used
[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 `longest2` is never used
[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 `first_word` is never used
[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: function `longest_with_an_announcement` is never used
[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: method `mixup` is never used
[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: method `announce_and_return_part` is never used
[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 `calculate` is never used
[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 `add_one_v1` is never used
[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 `Cacher` is never constructed
[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 `new` is never used
[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: method `value` is never used
[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: fields `aa` and `bb` are never read
[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]     |            fields in this struct
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Cons` and `Nil` are never constructed
[INFO] [stdout]    --> src/pointers.rs:273:9
[INFO] [stdout]     |
[INFO] [stdout] 272 |     enum List {
[INFO] [stdout]     |          ---- variants in this enum
[INFO] [stdout] 273 |         Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 274 |         Nil,
[INFO] [stdout]     |         ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value` and `children` are never read
[INFO] [stdout]    --> src/pointers.rs:288:9
[INFO] [stdout]     |
[INFO] [stdout] 287 |     struct Node {
[INFO] [stdout]     |            ---- fields in this struct
[INFO] [stdout] 288 |         value: i32,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 289 |         children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `tail` is never used
[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: fields `width`, `height`, and `options` are never read
[INFO] [stdout]   --> src/object_oriented.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 85 |     struct SelectBox {
[INFO] [stdout]    |            --------- fields in this struct
[INFO] [stdout] 86 |         width: u32,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 87 |         height: u32,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 88 |         options: Vec<String>,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `state` is never read
[INFO] [stdout]    --> src/object_oriented.rs:135:9
[INFO] [stdout]     |
[INFO] [stdout] 134 |     pub struct Post {
[INFO] [stdout]     |                ---- field in this struct
[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 `new` is never used
[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: method `add_text` is never used
[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: method `content` is never used
[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: method `request_review` is never used
[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: method `approve` is never used
[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: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stdout]    --> src/patterns.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 125 |     enum Message {
[INFO] [stdout]     |          ------- variants in this enum
[INFO] [stdout] 126 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 127 |         Move { x: i32, y: i32},
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 128 |         Write (String),
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Rgb` is never constructed
[INFO] [stdout]    --> src/patterns.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 139 |     enum Color {
[INFO] [stdout]     |          ----- variant in this enum
[INFO] [stdout] 140 |         Rgb(i32, i32, i32),
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stdout]    --> src/patterns.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 143 |     enum Message1 {
[INFO] [stdout]     |          -------- variants in this enum
[INFO] [stdout] 144 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 145 |         Move { x: i32, y: i32 },
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 146 |         Write(String),
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `split_at_mut1` is never used
[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 `unsafe_rust6` is never used
[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 `name` is never read
[INFO] [stdout]    --> src/advanced_features.rs:242:9
[INFO] [stdout]     |
[INFO] [stdout] 241 |     struct Dog {
[INFO] [stdout]     |            --- field in this struct
[INFO] [stdout] 242 |         name: String
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Result` is never used
[INFO] [stdout]    --> src/advanced_features.rs:338:10
[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 `Stop` is never constructed
[INFO] [stdout]    --> src/advanced_features.rs:453:9
[INFO] [stdout]     |
[INFO] [stdout] 451 |     enum Status {
[INFO] [stdout]     |          ------ variant in this enum
[INFO] [stdout] 452 |         Value(u32),
[INFO] [stdout] 453 |         Stop,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `returns_closure` is never used
[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: 109 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 1.09s
[INFO] running `Command { std: "docker" "inspect" "9860c9ad4d931c4dfbd37ed8c82e27f3e57bf802b19d6dcc242d39ce5236dc31", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9860c9ad4d931c4dfbd37ed8c82e27f3e57bf802b19d6dcc242d39ce5236dc31", kill_on_drop: false }`
[INFO] [stdout] 9860c9ad4d931c4dfbd37ed8c82e27f3e57bf802b19d6dcc242d39ce5236dc31
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 87223953f5ef6ee3bea533808df025c68696457265a9aba98ba4f21fe9f0063b
[INFO] running `Command { std: "docker" "start" "-a" "87223953f5ef6ee3bea533808df025c68696457265a9aba98ba4f21fe9f0063b", 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]    = help: use `//` for a plain comment
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[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: field `active` is never read
[INFO] [stdout]  --> src/structs.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     struct User {
[INFO] [stdout]   |            ---- field in this struct
[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 `build_user` is never used
[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: method `can_hold` is never used
[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 `V6` is never constructed
[INFO] [stdout]  --> src/enum_match.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 |     enum IpAddKind {V4,V6,}
[INFO] [stdout]   |          ---------     ^^
[INFO] [stdout]   |          |
[INFO] [stdout]   |          variant in this enum
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `kind` and `address` are never read
[INFO] [stdout]  --> src/enum_match.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     struct IpAddr {
[INFO] [stdout]   |            ------ fields in this struct
[INFO] [stdout] 7 |         kind: IpAddKind,
[INFO] [stdout]   |         ^^^^
[INFO] [stdout] 8 |         address: String,
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `ChangeColor` are never constructed
[INFO] [stdout]   --> src/enum_match.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     enum Message {
[INFO] [stdout]    |          ------- variants in this enum
[INFO] [stdout] 13 |         Quit,   // 没有关联任何数据
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 14 |         Move {x: i32, y: i32},  // 包含一个匿名结构体
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 15 |         Write(String),  // 包含单独一个 String
[INFO] [stdout] 16 |         ChangeColor(i32, i32, i32), // 包含三个 i32
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_config` is never used
[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 `read_username_from_file1` is never used
[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 `Guess` is never constructed
[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 `new` is never used
[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: method `value` is never used
[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 `y` is never read
[INFO] [stdout]   --> src/generics_trait.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     struct Point<T> {
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] 29 |         x: T,
[INFO] [stdout] 30 |         y: T,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Option` is never used
[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 `Result` is never used
[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 `Point1` is never constructed
[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: function `notify` is never used
[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 `notify1` is never used
[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 `notify2` is never used
[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 `notify3` is never used
[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 `some_function` is never used
[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 `return_school` is never used
[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 `longest2` is never used
[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 `first_word` is never used
[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: function `longest_with_an_announcement` is never used
[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: method `mixup` is never used
[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: method `announce_and_return_part` is never used
[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 `calculate` is never used
[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 `add_one_v1` is never used
[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 `Cacher` is never constructed
[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 `new` is never used
[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: method `value` is never used
[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: fields `aa` and `bb` are never read
[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]     |            fields in this struct
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Cons` and `Nil` are never constructed
[INFO] [stdout]    --> src/pointers.rs:273:9
[INFO] [stdout]     |
[INFO] [stdout] 272 |     enum List {
[INFO] [stdout]     |          ---- variants in this enum
[INFO] [stdout] 273 |         Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 274 |         Nil,
[INFO] [stdout]     |         ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value` and `children` are never read
[INFO] [stdout]    --> src/pointers.rs:288:9
[INFO] [stdout]     |
[INFO] [stdout] 287 |     struct Node {
[INFO] [stdout]     |            ---- fields in this struct
[INFO] [stdout] 288 |         value: i32,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 289 |         children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `tail` is never used
[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: fields `width`, `height`, and `options` are never read
[INFO] [stdout]   --> src/object_oriented.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 85 |     struct SelectBox {
[INFO] [stdout]    |            --------- fields in this struct
[INFO] [stdout] 86 |         width: u32,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 87 |         height: u32,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 88 |         options: Vec<String>,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `state` is never read
[INFO] [stdout]    --> src/object_oriented.rs:135:9
[INFO] [stdout]     |
[INFO] [stdout] 134 |     pub struct Post {
[INFO] [stdout]     |                ---- field in this struct
[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 `new` is never used
[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: method `add_text` is never used
[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: method `content` is never used
[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: method `request_review` is never used
[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: method `approve` is never used
[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: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stdout]    --> src/patterns.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 125 |     enum Message {
[INFO] [stdout]     |          ------- variants in this enum
[INFO] [stdout] 126 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 127 |         Move { x: i32, y: i32},
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 128 |         Write (String),
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Rgb` is never constructed
[INFO] [stdout]    --> src/patterns.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 139 |     enum Color {
[INFO] [stdout]     |          ----- variant in this enum
[INFO] [stdout] 140 |         Rgb(i32, i32, i32),
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stdout]    --> src/patterns.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 143 |     enum Message1 {
[INFO] [stdout]     |          -------- variants in this enum
[INFO] [stdout] 144 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 145 |         Move { x: i32, y: i32 },
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 146 |         Write(String),
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `split_at_mut1` is never used
[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 `unsafe_rust6` is never used
[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 `name` is never read
[INFO] [stdout]    --> src/advanced_features.rs:242:9
[INFO] [stdout]     |
[INFO] [stdout] 241 |     struct Dog {
[INFO] [stdout]     |            --- field in this struct
[INFO] [stdout] 242 |         name: String
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Result` is never used
[INFO] [stdout]    --> src/advanced_features.rs:338:10
[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 `Stop` is never constructed
[INFO] [stdout]    --> src/advanced_features.rs:453:9
[INFO] [stdout]     |
[INFO] [stdout] 451 |     enum Status {
[INFO] [stdout]     |          ------ variant in this enum
[INFO] [stdout] 452 |         Value(u32),
[INFO] [stdout] 453 |         Stop,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `returns_closure` is never used
[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: 109 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]    Compiling rust_study v0.1.0 (/opt/rustwide/workdir)
[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]    = help: use `//` for a plain comment
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[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: 1 warning emitted
[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: 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: field `active` is never read
[INFO] [stdout]  --> src/structs.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     struct User {
[INFO] [stdout]   |            ---- field in this struct
[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 `build_user` is never used
[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: method `can_hold` is never used
[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 `V6` is never constructed
[INFO] [stdout]  --> src/enum_match.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 |     enum IpAddKind {V4,V6,}
[INFO] [stdout]   |          ---------     ^^
[INFO] [stdout]   |          |
[INFO] [stdout]   |          variant in this enum
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `kind` and `address` are never read
[INFO] [stdout]  --> src/enum_match.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     struct IpAddr {
[INFO] [stdout]   |            ------ fields in this struct
[INFO] [stdout] 7 |         kind: IpAddKind,
[INFO] [stdout]   |         ^^^^
[INFO] [stdout] 8 |         address: String,
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `ChangeColor` are never constructed
[INFO] [stdout]   --> src/enum_match.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     enum Message {
[INFO] [stdout]    |          ------- variants in this enum
[INFO] [stdout] 13 |         Quit,   // 没有关联任何数据
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 14 |         Move {x: i32, y: i32},  // 包含一个匿名结构体
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 15 |         Write(String),  // 包含单独一个 String
[INFO] [stdout] 16 |         ChangeColor(i32, i32, i32), // 包含三个 i32
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_config` is never used
[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 `read_username_from_file1` is never used
[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 `Guess` is never constructed
[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 `new` is never used
[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: method `value` is never used
[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 `y` is never read
[INFO] [stdout]   --> src/generics_trait.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     struct Point<T> {
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] 29 |         x: T,
[INFO] [stdout] 30 |         y: T,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Option` is never used
[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 `Result` is never used
[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 `Point1` is never constructed
[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: function `notify` is never used
[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 `notify1` is never used
[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 `notify2` is never used
[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 `notify3` is never used
[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 `some_function` is never used
[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 `return_school` is never used
[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 `longest2` is never used
[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 `first_word` is never used
[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: function `longest_with_an_announcement` is never used
[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: method `mixup` is never used
[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: method `announce_and_return_part` is never used
[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 `expensive_test` is never used
[INFO] [stdout]    --> src/tests.rs:102:8
[INFO] [stdout]     |
[INFO] [stdout] 102 |     fn expensive_test() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]   --> src/tests.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 48 |     pub struct Guess {
[INFO] [stdout]    |                ----- field in this struct
[INFO] [stdout] 49 |         value: i32,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate` is never used
[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 `add_one_v1` is never used
[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 `Cacher` is never constructed
[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 `new` is never used
[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: method `value` is never used
[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: fields `aa` and `bb` are never read
[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]     |            fields in this struct
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Cons` and `Nil` are never constructed
[INFO] [stdout]    --> src/pointers.rs:273:9
[INFO] [stdout]     |
[INFO] [stdout] 272 |     enum List {
[INFO] [stdout]     |          ---- variants in this enum
[INFO] [stdout] 273 |         Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 274 |         Nil,
[INFO] [stdout]     |         ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value` and `children` are never read
[INFO] [stdout]    --> src/pointers.rs:288:9
[INFO] [stdout]     |
[INFO] [stdout] 287 |     struct Node {
[INFO] [stdout]     |            ---- fields in this struct
[INFO] [stdout] 288 |         value: i32,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 289 |         children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `tail` is never used
[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: fields `width`, `height`, and `options` are never read
[INFO] [stdout]   --> src/object_oriented.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 85 |     struct SelectBox {
[INFO] [stdout]    |            --------- fields in this struct
[INFO] [stdout] 86 |         width: u32,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 87 |         height: u32,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 88 |         options: Vec<String>,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `state` is never read
[INFO] [stdout]    --> src/object_oriented.rs:135:9
[INFO] [stdout]     |
[INFO] [stdout] 134 |     pub struct Post {
[INFO] [stdout]     |                ---- field in this struct
[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 `new` is never used
[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: method `add_text` is never used
[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: method `content` is never used
[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: method `request_review` is never used
[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: method `approve` is never used
[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: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stdout]    --> src/patterns.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 125 |     enum Message {
[INFO] [stdout]     |          ------- variants in this enum
[INFO] [stdout] 126 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 127 |         Move { x: i32, y: i32},
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 128 |         Write (String),
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Rgb` is never constructed
[INFO] [stdout]    --> src/patterns.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 139 |     enum Color {
[INFO] [stdout]     |          ----- variant in this enum
[INFO] [stdout] 140 |         Rgb(i32, i32, i32),
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stdout]    --> src/patterns.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 143 |     enum Message1 {
[INFO] [stdout]     |          -------- variants in this enum
[INFO] [stdout] 144 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 145 |         Move { x: i32, y: i32 },
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 146 |         Write(String),
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `split_at_mut1` is never used
[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 `unsafe_rust6` is never used
[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 `name` is never read
[INFO] [stdout]    --> src/advanced_features.rs:242:9
[INFO] [stdout]     |
[INFO] [stdout] 241 |     struct Dog {
[INFO] [stdout]     |            --- field in this struct
[INFO] [stdout] 242 |         name: String
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Result` is never used
[INFO] [stdout]    --> src/advanced_features.rs:338:10
[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 `Stop` is never constructed
[INFO] [stdout]    --> src/advanced_features.rs:453:9
[INFO] [stdout]     |
[INFO] [stdout] 451 |     enum Status {
[INFO] [stdout]     |          ------ variant in this enum
[INFO] [stdout] 452 |         Value(u32),
[INFO] [stdout] 453 |         Stop,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `returns_closure` is never used
[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: 113 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.51s
[INFO] running `Command { std: "docker" "inspect" "87223953f5ef6ee3bea533808df025c68696457265a9aba98ba4f21fe9f0063b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87223953f5ef6ee3bea533808df025c68696457265a9aba98ba4f21fe9f0063b", kill_on_drop: false }`
[INFO] [stdout] 87223953f5ef6ee3bea533808df025c68696457265a9aba98ba4f21fe9f0063b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 860cc06de3172062b0450c487e3e77e3471e6eae8882562d9bdf2b188f09be01
[INFO] running `Command { std: "docker" "start" "-a" "860cc06de3172062b0450c487e3e77e3471e6eae8882562d9bdf2b188f09be01", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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]    = help: use `//` for a plain comment
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[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: field `active` is never read
[INFO] [stderr]  --> src/structs.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 2 |     struct User {
[INFO] [stderr]   |            ---- field in this struct
[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 `build_user` is never used
[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: method `can_hold` is never used
[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 `V6` is never constructed
[INFO] [stderr]  --> src/enum_match.rs:2:24
[INFO] [stderr]   |
[INFO] [stderr] 2 |     enum IpAddKind {V4,V6,}
[INFO] [stderr]   |          ---------     ^^
[INFO] [stderr]   |          |
[INFO] [stderr]   |          variant in this enum
[INFO] [stderr] 
[INFO] [stderr] warning: fields `kind` and `address` are never read
[INFO] [stderr]  --> src/enum_match.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     struct IpAddr {
[INFO] [stderr]   |            ------ fields in this struct
[INFO] [stderr] 7 |         kind: IpAddKind,
[INFO] [stderr]   |         ^^^^
[INFO] [stderr] 8 |         address: String,
[INFO] [stderr]   |         ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variants `Quit`, `Move`, and `ChangeColor` are never constructed
[INFO] [stderr]   --> src/enum_match.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     enum Message {
[INFO] [stderr]    |          ------- variants in this enum
[INFO] [stderr] 13 |         Quit,   // 没有关联任何数据
[INFO] [stderr]    |         ^^^^
[INFO] [stderr] 14 |         Move {x: i32, y: i32},  // 包含一个匿名结构体
[INFO] [stderr]    |         ^^^^
[INFO] [stderr] 15 |         Write(String),  // 包含单独一个 String
[INFO] [stderr] 16 |         ChangeColor(i32, i32, i32), // 包含三个 i32
[INFO] [stderr]    |         ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `parse_config` is never used
[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 `read_username_from_file1` is never used
[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 `Guess` is never constructed
[INFO] [stderr]    --> src/error.rs:104:16
[INFO] [stderr]     |
[INFO] [stderr] 104 |     pub struct Guess {
[INFO] [stderr]     |                ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `new` is never used
[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: method `value` is never used
[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 `y` is never read
[INFO] [stderr]   --> src/generics_trait.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 28 |     struct Point<T> {
[INFO] [stderr]    |            ----- field in this struct
[INFO] [stderr] 29 |         x: T,
[INFO] [stderr] 30 |         y: T,
[INFO] [stderr]    |         ^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `Option` is never used
[INFO] [stderr]   --> src/generics_trait.rs:34:10
[INFO] [stderr]    |
[INFO] [stderr] 34 |     enum Option<T> {
[INFO] [stderr]    |          ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `Result` is never used
[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 `Point1` is never constructed
[INFO] [stderr]   --> src/generics_trait.rs:50:12
[INFO] [stderr]    |
[INFO] [stderr] 50 |     struct Point1<T, U> {
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `notify` is never used
[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 `notify1` is never used
[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 `notify2` is never used
[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 `notify3` is never used
[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 `some_function` is never used
[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 `return_school` is never used
[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 `longest2` is never used
[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 `first_word` is never used
[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: function `longest_with_an_announcement` is never used
[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: method `mixup` is never used
[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: method `announce_and_return_part` is never used
[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 `calculate` is never used
[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 `add_one_v1` is never used
[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 `Cacher` is never constructed
[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 `new` is never used
[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: method `value` is never used
[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: fields `aa` and `bb` are never read
[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]     |            fields in this struct
[INFO] [stderr] 
[INFO] [stderr] warning: variants `Cons` and `Nil` are never constructed
[INFO] [stderr]    --> src/pointers.rs:273:9
[INFO] [stderr]     |
[INFO] [stderr] 272 |     enum List {
[INFO] [stderr]     |          ---- variants in this enum
[INFO] [stderr] 273 |         Cons(i32, RefCell<Rc<List>>),
[INFO] [stderr]     |         ^^^^
[INFO] [stderr] 274 |         Nil,
[INFO] [stderr]     |         ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: fields `value` and `children` are never read
[INFO] [stderr]    --> src/pointers.rs:288:9
[INFO] [stderr]     |
[INFO] [stderr] 287 |     struct Node {
[INFO] [stderr]     |            ---- fields in this struct
[INFO] [stderr] 288 |         value: i32,
[INFO] [stderr]     |         ^^^^^
[INFO] [stderr] 289 |         children: RefCell<Vec<Rc<Node>>>,
[INFO] [stderr]     |         ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: method `tail` is never used
[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: fields `width`, `height`, and `options` are never read
[INFO] [stderr]   --> src/object_oriented.rs:86:9
[INFO] [stderr]    |
[INFO] [stderr] 85 |     struct SelectBox {
[INFO] [stderr]    |            --------- fields in this struct
[INFO] [stderr] 86 |         width: u32,
[INFO] [stderr]    |         ^^^^^
[INFO] [stderr] 87 |         height: u32,
[INFO] [stderr]    |         ^^^^^^
[INFO] [stderr] 88 |         options: Vec<String>,
[INFO] [stderr]    |         ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field `state` is never read
[INFO] [stderr]    --> src/object_oriented.rs:135:9
[INFO] [stderr]     |
[INFO] [stderr] 134 |     pub struct Post {
[INFO] [stderr]     |                ---- field in this struct
[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 `new` is never used
[INFO] [stderr]    --> src/object_oriented.rs:139:16
[INFO] [stderr]     |
[INFO] [stderr] 139 |         pub fn new () -> Post{
[INFO] [stderr]     |                ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `add_text` is never used
[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: method `content` is never used
[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: method `request_review` is never used
[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: method `approve` is never used
[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: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stderr]    --> src/patterns.rs:126:9
[INFO] [stderr]     |
[INFO] [stderr] 125 |     enum Message {
[INFO] [stderr]     |          ------- variants in this enum
[INFO] [stderr] 126 |         Quit,
[INFO] [stderr]     |         ^^^^
[INFO] [stderr] 127 |         Move { x: i32, y: i32},
[INFO] [stderr]     |         ^^^^
[INFO] [stderr] 128 |         Write (String),
[INFO] [stderr]     |         ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant `Rgb` is never constructed
[INFO] [stderr]    --> src/patterns.rs:140:9
[INFO] [stderr]     |
[INFO] [stderr] 139 |     enum Color {
[INFO] [stderr]     |          ----- variant in this enum
[INFO] [stderr] 140 |         Rgb(i32, i32, i32),
[INFO] [stderr]     |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stderr]    --> src/patterns.rs:144:9
[INFO] [stderr]     |
[INFO] [stderr] 143 |     enum Message1 {
[INFO] [stderr]     |          -------- variants in this enum
[INFO] [stderr] 144 |         Quit,
[INFO] [stderr]     |         ^^^^
[INFO] [stderr] 145 |         Move { x: i32, y: i32 },
[INFO] [stderr]     |         ^^^^
[INFO] [stderr] 146 |         Write(String),
[INFO] [stderr]     |         ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `split_at_mut1` is never used
[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 `unsafe_rust6` is never used
[INFO] [stderr]   --> src/advanced_features.rs:86:4
[INFO] [stderr]    |
[INFO] [stderr] 86 | fn unsafe_rust6() {
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field `name` is never read
[INFO] [stderr]    --> src/advanced_features.rs:242:9
[INFO] [stderr]     |
[INFO] [stderr] 241 |     struct Dog {
[INFO] [stderr]     |            --- field in this struct
[INFO] [stderr] 242 |         name: String
[INFO] [stderr]     |         ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type alias `Result` is never used
[INFO] [stderr]    --> src/advanced_features.rs:338:10
[INFO] [stderr]     |
[INFO] [stderr] 338 |     type Result<T> = std::result::Result<T, std::io::Error>;
[INFO] [stderr]     |          ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant `Stop` is never constructed
[INFO] [stderr]    --> src/advanced_features.rs:453:9
[INFO] [stderr]     |
[INFO] [stderr] 451 |     enum Status {
[INFO] [stderr]     |          ------ variant in this enum
[INFO] [stderr] 452 |         Value(u32),
[INFO] [stderr] 453 |         Stop,
[INFO] [stderr]     |         ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `returns_closure` is never used
[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 109 warnings (run `cargo fix --lib -p rust_study` to apply 50 suggestions)
[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` (bin "rust_study" test) generated 1 warning (run `cargo fix --bin "rust_study" --tests` to apply 1 suggestion)
[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: function `expensive_test` is never used
[INFO] [stderr]    --> src/tests.rs:102:8
[INFO] [stderr]     |
[INFO] [stderr] 102 |     fn expensive_test() {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field `value` is never read
[INFO] [stderr]   --> src/tests.rs:49:9
[INFO] [stderr]    |
[INFO] [stderr] 48 |     pub struct Guess {
[INFO] [stderr]    |                ----- field in this struct
[INFO] [stderr] 49 |         value: i32,
[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: `rust_study` (bin "rust_study") generated 1 warning (1 duplicate)
[INFO] [stderr] warning: `rust_study` (lib test) generated 113 warnings (109 duplicates) (run `cargo fix --lib -p rust_study --tests` to apply 1 suggestion)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.18s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/rust_study-1b9bbab7c658b6b6)
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test tests::tests::it_works ... ok
[INFO] [stdout] test tests::tests::larger_can_hold_smaller ... ok
[INFO] [stdout] test tests::tests::test_return ... ok
[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] [stderr] error: test failed, to rerun pass `--lib`
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x558689aa346a - std::backtrace_rs::backtrace::libunwind::trace::ha9053a9a07ca49cb
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
[INFO] [stdout]    1:     0x558689aa346a - std::backtrace_rs::backtrace::trace_unsynchronized::h9c2852a457ad564e
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stdout]    2:     0x558689aa346a - std::sys_common::backtrace::_print_fmt::h457936fbfaa0070f
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/sys_common/backtrace.rs:65:5
[INFO] [stdout]    3:     0x558689aa346a - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h5779d7bf7f70cb0c
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/sys_common/backtrace.rs:44:22
[INFO] [stdout]    4:     0x558689ac6afe - core::fmt::write::h5a4baaff1bcd3eb5
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/core/src/fmt/mod.rs:1232:17
[INFO] [stdout]    5:     0x558689aa08e5 - std::io::Write::write_fmt::h478f79c628ef31d1
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/io/mod.rs:1684:15
[INFO] [stdout]    6:     0x558689aa3235 - std::sys_common::backtrace::_print::h5fcdc36060f177e8
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/sys_common/backtrace.rs:47:5
[INFO] [stdout]    7:     0x558689aa3235 - std::sys_common::backtrace::print::h54ca9458b876c8bf
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/sys_common/backtrace.rs:34:9
[INFO] [stdout]    8:     0x558689aa4fff - std::panicking::default_hook::{{closure}}::hbe471161c7664ed6
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/panicking.rs:271:22
[INFO] [stdout]    9:     0x558689aa4cbf - std::panicking::default_hook::ha3500da57aa4ac4f
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/panicking.rs:287:9
[INFO] [stdout]   10:     0x558689a779d7 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hdf1b89dd137ece34
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/alloc/src/boxed.rs:2001:9
[INFO] [stdout]   11:     0x558689a779d7 - test::test_main::{{closure}}::h9081a79f20e75698
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/test/src/lib.rs:135:21
[INFO] [stdout]   12:     0x558689aa572d - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h6507bddc3eebb4a5
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/alloc/src/boxed.rs:2001:9
[INFO] [stdout]   13:     0x558689aa572d - std::panicking::rust_panic_with_hook::h50c09d000dc561d2
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/panicking.rs:696:13
[INFO] [stdout]   14:     0x558689aa54a9 - std::panicking::begin_panic_handler::{{closure}}::h9e2b2176e00e0d9c
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/panicking.rs:583:13
[INFO] [stdout]   15:     0x558689aa38d6 - std::sys_common::backtrace::__rust_end_short_backtrace::h5739b8e512c09d02
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/sys_common/backtrace.rs:150:18
[INFO] [stdout]   16:     0x558689aa51b2 - rust_begin_unwind
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/panicking.rs:579:5
[INFO] [stdout]   17:     0x558689a41b83 - core::panicking::panic_fmt::hf33a1475b4dc5c3e
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/core/src/panicking.rs:64:14
[INFO] [stdout]   18:     0x558689a4608d - rust_study::tests::tests::greeting_contains_name::h43d2e2c5e02f7632
[INFO] [stdout]                                at /opt/rustwide/workdir/src/tests.rs:42:9
[INFO] [stdout]   19:     0x558689a45f77 - rust_study::tests::tests::greeting_contains_name::{{closure}}::h816b73a3a8cc3fe5
[INFO] [stdout]                                at /opt/rustwide/workdir/src/tests.rs:39:33
[INFO] [stdout]   20:     0x558689a47785 - core::ops::function::FnOnce::call_once::h67d7e8c7ff69d383
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   21:     0x558689a7cdbf - core::ops::function::FnOnce::call_once::h7d969581be7d0075
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   22:     0x558689a7cdbf - test::__rust_begin_short_backtrace::hca25a52684e56655
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/test/src/lib.rs:656:18
[INFO] [stdout]   23:     0x558689a4e3dc - test::run_test::{{closure}}::ha8ac744c4af1a4bb
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/test/src/lib.rs:647:30
[INFO] [stdout]   24:     0x558689a4e3dc - core::ops::function::FnOnce::call_once{{vtable.shim}}::h7b411a9ed45bdecf
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   25:     0x558689a7bd86 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hd05328869a8ed200
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/alloc/src/boxed.rs:1987:9
[INFO] [stdout]   26:     0x558689a7bd86 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h0c601ce20bd5b2be
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/core/src/panic/unwind_safe.rs:271:9
[INFO] [stdout]   27:     0x558689a7bd86 - std::panicking::try::do_call::ha4be5c164fe30854
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/panicking.rs:487:40
[INFO] [stdout]   28:     0x558689a7bd86 - std::panicking::try::h604546f3609af05f
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/panicking.rs:451:19
[INFO] [stdout]   29:     0x558689a7bd86 - std::panic::catch_unwind::h5bfa8afe44c9c2f9
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/panic.rs:140:14
[INFO] [stdout]   30:     0x558689a7bd86 - test::run_test_in_process::hd50dee55dd63e6aa
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/test/src/lib.rs:679:27
[INFO] [stdout]   31:     0x558689a7bd86 - test::run_test::run_test_inner::{{closure}}::h4aa0f433aa85cea8
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/test/src/lib.rs:573:39
[INFO] [stdout]   32:     0x558689a48a51 - test::run_test::run_test_inner::{{closure}}::had56431adf24b4d6
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/test/src/lib.rs:600:37
[INFO] [stdout]   33:     0x558689a48a51 - std::sys_common::backtrace::__rust_begin_short_backtrace::ha8d9890e0c73bf13
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/sys_common/backtrace.rs:134:18
[INFO] [stdout]   34:     0x558689a4e46b - std::thread::Builder::spawn_unchecked_::{{closure}}::{{closure}}::h251832bcb4a95327
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/thread/mod.rs:560:17
[INFO] [stdout]   35:     0x558689a4e46b - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h8fdff598fa414831
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/core/src/panic/unwind_safe.rs:271:9
[INFO] [stdout]   36:     0x558689a4e46b - std::panicking::try::do_call::h455dd2f7764a950f
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/panicking.rs:487:40
[INFO] [stdout]   37:     0x558689a4e46b - std::panicking::try::had6f23b7b73ae72a
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/panicking.rs:451:19
[INFO] [stdout]   38:     0x558689a4e46b - std::panic::catch_unwind::ha6a5ca3915b4dad0
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/panic.rs:140:14
[INFO] [stdout]   39:     0x558689a4e46b - std::thread::Builder::spawn_unchecked_::{{closure}}::h883b72ef75da6231
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/thread/mod.rs:559:30
[INFO] [stdout]   40:     0x558689a4e46b - core::ops::function::FnOnce::call_once{{vtable.shim}}::hb7dff73dc8bd2ccb
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   41:     0x558689aa9a93 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h39990b24eedef2ab
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/alloc/src/boxed.rs:1987:9
[INFO] [stdout]   42:     0x558689aa9a93 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h01a027258444143b
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/alloc/src/boxed.rs:1987:9
[INFO] [stdout]   43:     0x558689aa9a93 - std::sys::unix::thread::Thread::new::thread_start::ha4f1cdd9c25884ba
[INFO] [stdout]                                at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/std/src/sys/unix/thread.rs:108:17
[INFO] [stdout]   44:     0x7fb935acfb43 - <unknown>
[INFO] [stdout]   45:     0x7fb935b60bb4 - __clone
[INFO] [stdout]   46:                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 0.01s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "860cc06de3172062b0450c487e3e77e3471e6eae8882562d9bdf2b188f09be01", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "860cc06de3172062b0450c487e3e77e3471e6eae8882562d9bdf2b188f09be01", kill_on_drop: false }`
[INFO] [stdout] 860cc06de3172062b0450c487e3e77e3471e6eae8882562d9bdf2b188f09be01
