[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 master#1871252fc8bb672d40787e67404e6eaae7059369 for pr-125151
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flazylook2%2Frust_study" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lazylook2/rust_study on toolchain 1871252fc8bb672d40787e67404e6eaae7059369
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "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-4-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" "+1871252fc8bb672d40787e67404e6eaae7059369" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dbe77274ae00f496bcbe9353db01c223b2ad6ef7e8f803ebce184d64ec51e330
[INFO] running `Command { std: "docker" "start" "-a" "dbe77274ae00f496bcbe9353db01c223b2ad6ef7e8f803ebce184d64ec51e330", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dbe77274ae00f496bcbe9353db01c223b2ad6ef7e8f803ebce184d64ec51e330", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dbe77274ae00f496bcbe9353db01c223b2ad6ef7e8f803ebce184d64ec51e330", kill_on_drop: false }`
[INFO] [stdout] dbe77274ae00f496bcbe9353db01c223b2ad6ef7e8f803ebce184d64ec51e330
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1b7fd84c4fc3307e32245fceaf76de90677b12f3bf290ca52ae66423bd8dd9ad
[INFO] running `Command { std: "docker" "start" "-a" "1b7fd84c4fc3307e32245fceaf76de90677b12f3bf290ca52ae66423bd8dd9ad", 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: 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: 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: 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: 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: 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: 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: 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: fields `0` and `1` are never read
[INFO] [stdout]   --> src/structs.rs:45:18
[INFO] [stdout]    |
[INFO] [stdout] 45 |     struct Color(i32, i32, i32);
[INFO] [stdout]    |            ----- ^^^  ^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            fields in this struct
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 45 |     struct Color((), (), i32);
[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] 61 |     impl Rectangle {
[INFO] [stdout]    |     -------------- method in this implementation
[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: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Int(i32),
[INFO] [stdout]    |         --- ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Int(()),
[INFO] [stdout]    |             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:35:15
[INFO] [stdout]    |
[INFO] [stdout] 35 |         Float(f64),
[INFO] [stdout]    |         ----- ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 35 |         Float(()),
[INFO] [stdout]    |               ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:36:14
[INFO] [stdout]    |
[INFO] [stdout] 36 |         Text(String),
[INFO] [stdout]    |         ---- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 36 |         Text(()),
[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 items `new` and `value` are never used
[INFO] [stdout]    --> src/error.rs:109:16
[INFO] [stdout]     |
[INFO] [stdout] 108 |     impl Guess {
[INFO] [stdout]     |     ---------- associated items in this implementation
[INFO] [stdout] 109 |         pub fn new(value: i32) -> Guess {
[INFO] [stdout]     |                ^^^
[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: method `mixup` is never used
[INFO] [stdout]   --> src/generics_trait.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 54 |     impl<T, U> Point1<T, U> {
[INFO] [stdout]    |     ----------------------- method in this implementation
[INFO] [stdout] 55 |         fn mixup<V, W>(self, other: Point1<V, W>) -> Point1<T, W> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `teacher` is never used
[INFO] [stdout]   --> src/generics_trait.rs:73:15
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub trait teacher {
[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: method `announce_and_return_part` is never used
[INFO] [stdout]    --> src/generics_trait.rs:298:12
[INFO] [stdout]     |
[INFO] [stdout] 295 |     impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]     |     ----------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 298 |         fn announce_and_return_part(&self, announcement: &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: 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 items `new` and `value` are never used
[INFO] [stdout]   --> src/iterators_closures.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 42 |     impl<T> Cacher<T> where T: Fn(u32) -> u32
[INFO] [stdout]    |     ----------------------------------------- associated items in this implementation
[INFO] [stdout] 43 |     {
[INFO] [stdout] 44 |         fn new (calculation: T) -> Cacher<T>{
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 47 |         fn value (&mut self, arg: u32) -> u32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/pointers.rs:146:14
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Cons(i32, Rc<List>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Cons((), ()),
[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: fields `0` and `1` are never read
[INFO] [stdout]    --> src/pointers.rs:253:14
[INFO] [stdout]     |
[INFO] [stdout] 253 |         Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout]     |         ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 253 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]    --> src/pointers.rs:272:10
[INFO] [stdout]     |
[INFO] [stdout] 272 |     enum List {
[INFO] [stdout]     |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `tail` is never used
[INFO] [stdout]    --> src/pointers.rs:278:12
[INFO] [stdout]     |
[INFO] [stdout] 277 |     impl List {
[INFO] [stdout]     |     --------- method in this implementation
[INFO] [stdout] 278 |         fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stdout]     |            ^^^^
[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: fields `width`, `height`, and `label` are never read
[INFO] [stdout]   --> src/object_oriented.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 75 |     pub struct Button {
[INFO] [stdout]    |                ------ fields in this struct
[INFO] [stdout] 76 |         pub width: u32,
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout] 77 |         pub height: u32,
[INFO] [stdout]    |             ^^^^^^
[INFO] [stdout] 78 |         pub label: String
[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: struct `Post` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:134:16
[INFO] [stdout]     |
[INFO] [stdout] 134 |     pub struct Post {
[INFO] [stdout]     |                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add_text`, `content`, `request_review`, and `approve` are never used
[INFO] [stdout]    --> src/object_oriented.rs:139:16
[INFO] [stdout]     |
[INFO] [stdout] 138 |     impl Post {
[INFO] [stdout]     |     --------- associated items in this implementation
[INFO] [stdout] 139 |         pub fn new () -> Post{
[INFO] [stdout]     |                ^^^
[INFO] [stdout] ...
[INFO] [stdout] 143 |         pub fn add_text(&mut self, text: &str) {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 152 |         pub fn content(&self) -> &str{
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 155 |         pub fn request_review(&mut self){
[INFO] [stdout]     |                ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 162 |         pub fn approve(&mut self){
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `State` is never used
[INFO] [stdout]    --> src/object_oriented.rs:170:11
[INFO] [stdout]     |
[INFO] [stdout] 170 |     trait State {
[INFO] [stdout]     |           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Draft` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:178:13
[INFO] [stdout]     |
[INFO] [stdout] 178 |     struct  Draft {}
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PendingReview` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:188:12
[INFO] [stdout]     |
[INFO] [stdout] 188 |     struct PendingReview {}
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Published` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:198:12
[INFO] [stdout]     |
[INFO] [stdout] 198 |     struct Published {}
[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: trait `Wizard` is never used
[INFO] [stdout]    --> src/advanced_features.rs:208:11
[INFO] [stdout]     |
[INFO] [stdout] 208 |     trait Wizard {
[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: trait `OutlinePrint` is never used
[INFO] [stdout]    --> src/advanced_features.rs:268:11
[INFO] [stdout]     |
[INFO] [stdout] 268 |     trait OutlinePrint: fmt::Display {
[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: trait `Write` is never used
[INFO] [stdout]    --> src/advanced_features.rs:339:15
[INFO] [stdout]     |
[INFO] [stdout] 339 |     pub trait Write {
[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: non-local `macro_rules!` definition, they should be avoided as they go against expectation
[INFO] [stdout]    --> src/advanced_features.rs:491:5
[INFO] [stdout]     |
[INFO] [stdout] 491 | /     macro_rules! my_vec {
[INFO] [stdout] 492 | |         ( $( $x: expr ), * ) => {
[INFO] [stdout] 493 | |             {
[INFO] [stdout] 494 | |                 let mut temp_vec = Vec::new();
[INFO] [stdout] ...   |
[INFO] [stdout] 500 | |         }
[INFO] [stdout] 501 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout]     |
[INFO] [stdout]     = help: remove the `#[macro_export]` or move this `macro_rules!` outside the of the current function `macros1`
[INFO] [stdout]     = note: a `macro_rules!` definition is non-local if it is nested inside an item and has a `#[macro_export]` attribute
[INFO] [stdout]     = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module
[INFO] [stdout]     = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
[INFO] [stdout]     = note: `#[warn(non_local_definitions)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 119 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` profile [unoptimized + debuginfo] target(s) in 0.68s
[INFO] running `Command { std: "docker" "inspect" "1b7fd84c4fc3307e32245fceaf76de90677b12f3bf290ca52ae66423bd8dd9ad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1b7fd84c4fc3307e32245fceaf76de90677b12f3bf290ca52ae66423bd8dd9ad", kill_on_drop: false }`
[INFO] [stdout] 1b7fd84c4fc3307e32245fceaf76de90677b12f3bf290ca52ae66423bd8dd9ad
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a684edc23a1b023238bf0d51b077eb0bcca4907bed63db10c5cc9c2f7b8454f3
[INFO] running `Command { std: "docker" "start" "-a" "a684edc23a1b023238bf0d51b077eb0bcca4907bed63db10c5cc9c2f7b8454f3", 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: 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: 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: 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: 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: 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: 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: 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: fields `0` and `1` are never read
[INFO] [stdout]   --> src/structs.rs:45:18
[INFO] [stdout]    |
[INFO] [stdout] 45 |     struct Color(i32, i32, i32);
[INFO] [stdout]    |            ----- ^^^  ^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            fields in this struct
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 45 |     struct Color((), (), i32);
[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] 61 |     impl Rectangle {
[INFO] [stdout]    |     -------------- method in this implementation
[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: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Int(i32),
[INFO] [stdout]    |         --- ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Int(()),
[INFO] [stdout]    |             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:35:15
[INFO] [stdout]    |
[INFO] [stdout] 35 |         Float(f64),
[INFO] [stdout]    |         ----- ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 35 |         Float(()),
[INFO] [stdout]    |               ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:36:14
[INFO] [stdout]    |
[INFO] [stdout] 36 |         Text(String),
[INFO] [stdout]    |         ---- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 36 |         Text(()),
[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 items `new` and `value` are never used
[INFO] [stdout]    --> src/error.rs:109:16
[INFO] [stdout]     |
[INFO] [stdout] 108 |     impl Guess {
[INFO] [stdout]     |     ---------- associated items in this implementation
[INFO] [stdout] 109 |         pub fn new(value: i32) -> Guess {
[INFO] [stdout]     |                ^^^
[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: method `mixup` is never used
[INFO] [stdout]   --> src/generics_trait.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 54 |     impl<T, U> Point1<T, U> {
[INFO] [stdout]    |     ----------------------- method in this implementation
[INFO] [stdout] 55 |         fn mixup<V, W>(self, other: Point1<V, W>) -> Point1<T, W> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `teacher` is never used
[INFO] [stdout]   --> src/generics_trait.rs:73:15
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub trait teacher {
[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: method `announce_and_return_part` is never used
[INFO] [stdout]    --> src/generics_trait.rs:298:12
[INFO] [stdout]     |
[INFO] [stdout] 295 |     impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]     |     ----------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 298 |         fn announce_and_return_part(&self, announcement: &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: 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 items `new` and `value` are never used
[INFO] [stdout]   --> src/iterators_closures.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 42 |     impl<T> Cacher<T> where T: Fn(u32) -> u32
[INFO] [stdout]    |     ----------------------------------------- associated items in this implementation
[INFO] [stdout] 43 |     {
[INFO] [stdout] 44 |         fn new (calculation: T) -> Cacher<T>{
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 47 |         fn value (&mut self, arg: u32) -> u32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/pointers.rs:146:14
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Cons(i32, Rc<List>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Cons((), ()),
[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: fields `0` and `1` are never read
[INFO] [stdout]    --> src/pointers.rs:253:14
[INFO] [stdout]     |
[INFO] [stdout] 253 |         Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout]     |         ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 253 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]    --> src/pointers.rs:272:10
[INFO] [stdout]     |
[INFO] [stdout] 272 |     enum List {
[INFO] [stdout]     |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `tail` is never used
[INFO] [stdout]    --> src/pointers.rs:278:12
[INFO] [stdout]     |
[INFO] [stdout] 277 |     impl List {
[INFO] [stdout]     |     --------- method in this implementation
[INFO] [stdout] 278 |         fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stdout]     |            ^^^^
[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: fields `width`, `height`, and `label` are never read
[INFO] [stdout]   --> src/object_oriented.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 75 |     pub struct Button {
[INFO] [stdout]    |                ------ fields in this struct
[INFO] [stdout] 76 |         pub width: u32,
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout] 77 |         pub height: u32,
[INFO] [stdout]    |             ^^^^^^
[INFO] [stdout] 78 |         pub label: String
[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: struct `Post` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:134:16
[INFO] [stdout]     |
[INFO] [stdout] 134 |     pub struct Post {
[INFO] [stdout]     |                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add_text`, `content`, `request_review`, and `approve` are never used
[INFO] [stdout]    --> src/object_oriented.rs:139:16
[INFO] [stdout]     |
[INFO] [stdout] 138 |     impl Post {
[INFO] [stdout]     |     --------- associated items in this implementation
[INFO] [stdout] 139 |         pub fn new () -> Post{
[INFO] [stdout]     |                ^^^
[INFO] [stdout] ...
[INFO] [stdout] 143 |         pub fn add_text(&mut self, text: &str) {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 152 |         pub fn content(&self) -> &str{
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 155 |         pub fn request_review(&mut self){
[INFO] [stdout]     |                ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 162 |         pub fn approve(&mut self){
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `State` is never used
[INFO] [stdout]    --> src/object_oriented.rs:170:11
[INFO] [stdout]     |
[INFO] [stdout] 170 |     trait State {
[INFO] [stdout]     |           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Draft` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:178:13
[INFO] [stdout]     |
[INFO] [stdout] 178 |     struct  Draft {}
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PendingReview` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:188:12
[INFO] [stdout]     |
[INFO] [stdout] 188 |     struct PendingReview {}
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Published` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:198:12
[INFO] [stdout]     |
[INFO] [stdout] 198 |     struct Published {}
[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: trait `Wizard` is never used
[INFO] [stdout]    --> src/advanced_features.rs:208:11
[INFO] [stdout]     |
[INFO] [stdout] 208 |     trait Wizard {
[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: trait `OutlinePrint` is never used
[INFO] [stdout]    --> src/advanced_features.rs:268:11
[INFO] [stdout]     |
[INFO] [stdout] 268 |     trait OutlinePrint: fmt::Display {
[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: trait `Write` is never used
[INFO] [stdout]    --> src/advanced_features.rs:339:15
[INFO] [stdout]     |
[INFO] [stdout] 339 |     pub trait Write {
[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: non-local `macro_rules!` definition, they should be avoided as they go against expectation
[INFO] [stdout]    --> src/advanced_features.rs:491:5
[INFO] [stdout]     |
[INFO] [stdout] 491 | /     macro_rules! my_vec {
[INFO] [stdout] 492 | |         ( $( $x: expr ), * ) => {
[INFO] [stdout] 493 | |             {
[INFO] [stdout] 494 | |                 let mut temp_vec = Vec::new();
[INFO] [stdout] ...   |
[INFO] [stdout] 500 | |         }
[INFO] [stdout] 501 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout]     |
[INFO] [stdout]     = help: remove the `#[macro_export]` or move this `macro_rules!` outside the of the current function `macros1`
[INFO] [stdout]     = note: a `macro_rules!` definition is non-local if it is nested inside an item and has a `#[macro_export]` attribute
[INFO] [stdout]     = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module
[INFO] [stdout]     = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
[INFO] [stdout]     = note: `#[warn(non_local_definitions)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 119 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] [stderr]    Compiling rust_study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `advanced_functions1`
[INFO] [stdout]  --> src/main.rs:3:37
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rust_study::advanced_features::{advanced_functions1, macros1};
[INFO] [stdout]   |                                     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/concurrency.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ErrorKind`, `Error`
[INFO] [stdout]  --> src/error.rs:2:15
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{ErrorKind, Read, Error};
[INFO] [stdout]   |               ^^^^^^^^^        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `teacher` should have an upper camel case name
[INFO] [stdout]   --> src/generics_trait.rs:73:15
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub trait teacher {
[INFO] [stdout]    |               ^^^^^^^ help: convert the identifier to upper camel case: `Teacher`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 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: 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: 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: 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: 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: 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: 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: 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: 1 warning emitted
[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: 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: fields `0` and `1` are never read
[INFO] [stdout]   --> src/structs.rs:45:18
[INFO] [stdout]    |
[INFO] [stdout] 45 |     struct Color(i32, i32, i32);
[INFO] [stdout]    |            ----- ^^^  ^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            fields in this struct
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 45 |     struct Color((), (), i32);
[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] 61 |     impl Rectangle {
[INFO] [stdout]    |     -------------- method in this implementation
[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: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Int(i32),
[INFO] [stdout]    |         --- ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Int(()),
[INFO] [stdout]    |             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:35:15
[INFO] [stdout]    |
[INFO] [stdout] 35 |         Float(f64),
[INFO] [stdout]    |         ----- ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 35 |         Float(()),
[INFO] [stdout]    |               ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:36:14
[INFO] [stdout]    |
[INFO] [stdout] 36 |         Text(String),
[INFO] [stdout]    |         ---- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 36 |         Text(()),
[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 items `new` and `value` are never used
[INFO] [stdout]    --> src/error.rs:109:16
[INFO] [stdout]     |
[INFO] [stdout] 108 |     impl Guess {
[INFO] [stdout]     |     ---------- associated items in this implementation
[INFO] [stdout] 109 |         pub fn new(value: i32) -> Guess {
[INFO] [stdout]     |                ^^^
[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: method `mixup` is never used
[INFO] [stdout]   --> src/generics_trait.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 54 |     impl<T, U> Point1<T, U> {
[INFO] [stdout]    |     ----------------------- method in this implementation
[INFO] [stdout] 55 |         fn mixup<V, W>(self, other: Point1<V, W>) -> Point1<T, W> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `teacher` is never used
[INFO] [stdout]   --> src/generics_trait.rs:73:15
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub trait teacher {
[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: method `announce_and_return_part` is never used
[INFO] [stdout]    --> src/generics_trait.rs:298:12
[INFO] [stdout]     |
[INFO] [stdout] 295 |     impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]     |     ----------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 298 |         fn announce_and_return_part(&self, announcement: &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: 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 items `new` and `value` are never used
[INFO] [stdout]   --> src/iterators_closures.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 42 |     impl<T> Cacher<T> where T: Fn(u32) -> u32
[INFO] [stdout]    |     ----------------------------------------- associated items in this implementation
[INFO] [stdout] 43 |     {
[INFO] [stdout] 44 |         fn new (calculation: T) -> Cacher<T>{
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 47 |         fn value (&mut self, arg: u32) -> u32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/pointers.rs:146:14
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Cons(i32, Rc<List>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Cons((), ()),
[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: fields `0` and `1` are never read
[INFO] [stdout]    --> src/pointers.rs:253:14
[INFO] [stdout]     |
[INFO] [stdout] 253 |         Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout]     |         ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 253 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]    --> src/pointers.rs:272:10
[INFO] [stdout]     |
[INFO] [stdout] 272 |     enum List {
[INFO] [stdout]     |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `tail` is never used
[INFO] [stdout]    --> src/pointers.rs:278:12
[INFO] [stdout]     |
[INFO] [stdout] 277 |     impl List {
[INFO] [stdout]     |     --------- method in this implementation
[INFO] [stdout] 278 |         fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stdout]     |            ^^^^
[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: fields `width`, `height`, and `label` are never read
[INFO] [stdout]   --> src/object_oriented.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 75 |     pub struct Button {
[INFO] [stdout]    |                ------ fields in this struct
[INFO] [stdout] 76 |         pub width: u32,
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout] 77 |         pub height: u32,
[INFO] [stdout]    |             ^^^^^^
[INFO] [stdout] 78 |         pub label: String
[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: struct `Post` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:134:16
[INFO] [stdout]     |
[INFO] [stdout] 134 |     pub struct Post {
[INFO] [stdout]     |                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add_text`, `content`, `request_review`, and `approve` are never used
[INFO] [stdout]    --> src/object_oriented.rs:139:16
[INFO] [stdout]     |
[INFO] [stdout] 138 |     impl Post {
[INFO] [stdout]     |     --------- associated items in this implementation
[INFO] [stdout] 139 |         pub fn new () -> Post{
[INFO] [stdout]     |                ^^^
[INFO] [stdout] ...
[INFO] [stdout] 143 |         pub fn add_text(&mut self, text: &str) {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 152 |         pub fn content(&self) -> &str{
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 155 |         pub fn request_review(&mut self){
[INFO] [stdout]     |                ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 162 |         pub fn approve(&mut self){
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `State` is never used
[INFO] [stdout]    --> src/object_oriented.rs:170:11
[INFO] [stdout]     |
[INFO] [stdout] 170 |     trait State {
[INFO] [stdout]     |           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Draft` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:178:13
[INFO] [stdout]     |
[INFO] [stdout] 178 |     struct  Draft {}
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PendingReview` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:188:12
[INFO] [stdout]     |
[INFO] [stdout] 188 |     struct PendingReview {}
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Published` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:198:12
[INFO] [stdout]     |
[INFO] [stdout] 198 |     struct Published {}
[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: trait `Wizard` is never used
[INFO] [stdout]    --> src/advanced_features.rs:208:11
[INFO] [stdout]     |
[INFO] [stdout] 208 |     trait Wizard {
[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: trait `OutlinePrint` is never used
[INFO] [stdout]    --> src/advanced_features.rs:268:11
[INFO] [stdout]     |
[INFO] [stdout] 268 |     trait OutlinePrint: fmt::Display {
[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: trait `Write` is never used
[INFO] [stdout]    --> src/advanced_features.rs:339:15
[INFO] [stdout]     |
[INFO] [stdout] 339 |     pub trait Write {
[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: non-local `macro_rules!` definition, they should be avoided as they go against expectation
[INFO] [stdout]    --> src/advanced_features.rs:491:5
[INFO] [stdout]     |
[INFO] [stdout] 491 | /     macro_rules! my_vec {
[INFO] [stdout] 492 | |         ( $( $x: expr ), * ) => {
[INFO] [stdout] 493 | |             {
[INFO] [stdout] 494 | |                 let mut temp_vec = Vec::new();
[INFO] [stdout] ...   |
[INFO] [stdout] 500 | |         }
[INFO] [stdout] 501 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout]     |
[INFO] [stdout]     = help: remove the `#[macro_export]` or move this `macro_rules!` outside the of the current function `macros1`
[INFO] [stdout]     = note: a `macro_rules!` definition is non-local if it is nested inside an item and has a `#[macro_export]` attribute
[INFO] [stdout]     = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module
[INFO] [stdout]     = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
[INFO] [stdout]     = note: `#[warn(non_local_definitions)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 123 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.40s
[INFO] running `Command { std: "docker" "inspect" "a684edc23a1b023238bf0d51b077eb0bcca4907bed63db10c5cc9c2f7b8454f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a684edc23a1b023238bf0d51b077eb0bcca4907bed63db10c5cc9c2f7b8454f3", kill_on_drop: false }`
[INFO] [stdout] a684edc23a1b023238bf0d51b077eb0bcca4907bed63db10c5cc9c2f7b8454f3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 3ad53c3c9fe5aa3ed33e4f9a27d82a4cb7fcfbcd3685af13a58f93e3b1bc466d
[INFO] running `Command { std: "docker" "start" "-a" "3ad53c3c9fe5aa3ed33e4f9a27d82a4cb7fcfbcd3685af13a58f93e3b1bc466d", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `std::rc::Rc`
[INFO] [stderr]  --> src/concurrency.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::rc::Rc;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `ErrorKind`, `Error`
[INFO] [stderr]  --> src/error.rs:2:15
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::{ErrorKind, Read, Error};
[INFO] [stderr]   |               ^^^^^^^^^        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `teacher` should have an upper camel case name
[INFO] [stderr]   --> src/generics_trait.rs:73:15
[INFO] [stderr]    |
[INFO] [stderr] 73 |     pub trait teacher {
[INFO] [stderr]    |               ^^^^^^^ help: convert the identifier to upper camel case: `Teacher`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/iterators_closures.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 22 |     /// 完整标注的闭包定义
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 23 |     let add_one_v2 = |x: u32| -> u32 { x + 1 };
[INFO] [stderr]    |     ------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr]    |
[INFO] [stderr]    = 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: 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: 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: 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: 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: 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: 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: 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: fields `0` and `1` are never read
[INFO] [stderr]   --> src/structs.rs:45:18
[INFO] [stderr]    |
[INFO] [stderr] 45 |     struct Color(i32, i32, i32);
[INFO] [stderr]    |            ----- ^^^  ^^^
[INFO] [stderr]    |            |
[INFO] [stderr]    |            fields in this struct
[INFO] [stderr]    |
[INFO] [stderr] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stderr]    |
[INFO] [stderr] 45 |     struct Color((), (), i32);
[INFO] [stderr]    |                  ~~  ~~
[INFO] [stderr] 
[INFO] [stderr] warning: method `can_hold` is never used
[INFO] [stderr]   --> src/structs.rs:65:12
[INFO] [stderr]    |
[INFO] [stderr] 61 |     impl Rectangle {
[INFO] [stderr]    |     -------------- method in this implementation
[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: field `0` is never read
[INFO] [stderr]   --> src/collections.rs:34:13
[INFO] [stderr]    |
[INFO] [stderr] 34 |         Int(i32),
[INFO] [stderr]    |         --- ^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         field in this variant
[INFO] [stderr]    |
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 34 |         Int(()),
[INFO] [stderr]    |             ~~
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/collections.rs:35:15
[INFO] [stderr]    |
[INFO] [stderr] 35 |         Float(f64),
[INFO] [stderr]    |         ----- ^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         field in this variant
[INFO] [stderr]    |
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 35 |         Float(()),
[INFO] [stderr]    |               ~~
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/collections.rs:36:14
[INFO] [stderr]    |
[INFO] [stderr] 36 |         Text(String),
[INFO] [stderr]    |         ---- ^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         field in this variant
[INFO] [stderr]    |
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 36 |         Text(()),
[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 items `new` and `value` are never used
[INFO] [stderr]    --> src/error.rs:109:16
[INFO] [stderr]     |
[INFO] [stderr] 108 |     impl Guess {
[INFO] [stderr]     |     ---------- associated items in this implementation
[INFO] [stderr] 109 |         pub fn new(value: i32) -> Guess {
[INFO] [stderr]     |                ^^^
[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: method `mixup` is never used
[INFO] [stderr]   --> src/generics_trait.rs:55:12
[INFO] [stderr]    |
[INFO] [stderr] 54 |     impl<T, U> Point1<T, U> {
[INFO] [stderr]    |     ----------------------- method in this implementation
[INFO] [stderr] 55 |         fn mixup<V, W>(self, other: Point1<V, W>) -> Point1<T, W> {
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `teacher` is never used
[INFO] [stderr]   --> src/generics_trait.rs:73:15
[INFO] [stderr]    |
[INFO] [stderr] 73 |     pub trait teacher {
[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: method `announce_and_return_part` is never used
[INFO] [stderr]    --> src/generics_trait.rs:298:12
[INFO] [stderr]     |
[INFO] [stderr] 295 |     impl<'a> ImportantExcerpt<'a> {
[INFO] [stderr]     |     ----------------------------- method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 298 |         fn announce_and_return_part(&self, announcement: &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: 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 items `new` and `value` are never used
[INFO] [stderr]   --> src/iterators_closures.rs:44:12
[INFO] [stderr]    |
[INFO] [stderr] 42 |     impl<T> Cacher<T> where T: Fn(u32) -> u32
[INFO] [stderr]    |     ----------------------------------------- associated items in this implementation
[INFO] [stderr] 43 |     {
[INFO] [stderr] 44 |         fn new (calculation: T) -> Cacher<T>{
[INFO] [stderr]    |            ^^^
[INFO] [stderr] ...
[INFO] [stderr] 47 |         fn value (&mut self, arg: u32) -> u32 {
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: fields `0` and `1` are never read
[INFO] [stderr]    --> src/pointers.rs:146:14
[INFO] [stderr]     |
[INFO] [stderr] 146 |         Cons(i32, Rc<List>),
[INFO] [stderr]     |         ---- ^^^  ^^^^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         fields in this variant
[INFO] [stderr]     |
[INFO] [stderr] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stderr]     |
[INFO] [stderr] 146 |         Cons((), ()),
[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: fields `0` and `1` are never read
[INFO] [stderr]    --> src/pointers.rs:253:14
[INFO] [stderr]     |
[INFO] [stderr] 253 |         Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stderr]     |         ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         fields in this variant
[INFO] [stderr]     |
[INFO] [stderr] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stderr]     |
[INFO] [stderr] 253 |         Cons((), ()),
[INFO] [stderr]     |              ~~  ~~
[INFO] [stderr] 
[INFO] [stderr] warning: enum `List` is never used
[INFO] [stderr]    --> src/pointers.rs:272:10
[INFO] [stderr]     |
[INFO] [stderr] 272 |     enum List {
[INFO] [stderr]     |          ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `tail` is never used
[INFO] [stderr]    --> src/pointers.rs:278:12
[INFO] [stderr]     |
[INFO] [stderr] 277 |     impl List {
[INFO] [stderr]     |     --------- method in this implementation
[INFO] [stderr] 278 |         fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stderr]     |            ^^^^
[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: fields `width`, `height`, and `label` are never read
[INFO] [stderr]   --> src/object_oriented.rs:76:13
[INFO] [stderr]    |
[INFO] [stderr] 75 |     pub struct Button {
[INFO] [stderr]    |                ------ fields in this struct
[INFO] [stderr] 76 |         pub width: u32,
[INFO] [stderr]    |             ^^^^^
[INFO] [stderr] 77 |         pub height: u32,
[INFO] [stderr]    |             ^^^^^^
[INFO] [stderr] 78 |         pub label: String
[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: struct `Post` is never constructed
[INFO] [stderr]    --> src/object_oriented.rs:134:16
[INFO] [stderr]     |
[INFO] [stderr] 134 |     pub struct Post {
[INFO] [stderr]     |                ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new`, `add_text`, `content`, `request_review`, and `approve` are never used
[INFO] [stderr]    --> src/object_oriented.rs:139:16
[INFO] [stderr]     |
[INFO] [stderr] 138 |     impl Post {
[INFO] [stderr]     |     --------- associated items in this implementation
[INFO] [stderr] 139 |         pub fn new () -> Post{
[INFO] [stderr]     |                ^^^
[INFO] [stderr] ...
[INFO] [stderr] 143 |         pub fn add_text(&mut self, text: &str) {
[INFO] [stderr]     |                ^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 152 |         pub fn content(&self) -> &str{
[INFO] [stderr]     |                ^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 155 |         pub fn request_review(&mut self){
[INFO] [stderr]     |                ^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 162 |         pub fn approve(&mut self){
[INFO] [stderr]     |                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `State` is never used
[INFO] [stderr]    --> src/object_oriented.rs:170:11
[INFO] [stderr]     |
[INFO] [stderr] 170 |     trait State {
[INFO] [stderr]     |           ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Draft` is never constructed
[INFO] [stderr]    --> src/object_oriented.rs:178:13
[INFO] [stderr]     |
[INFO] [stderr] 178 |     struct  Draft {}
[INFO] [stderr]     |             ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `PendingReview` is never constructed
[INFO] [stderr]    --> src/object_oriented.rs:188:12
[INFO] [stderr]     |
[INFO] [stderr] 188 |     struct PendingReview {}
[INFO] [stderr]     |            ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Published` is never constructed
[INFO] [stderr]    --> src/object_oriented.rs:198:12
[INFO] [stderr]     |
[INFO] [stderr] 198 |     struct Published {}
[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: trait `Wizard` is never used
[INFO] [stderr]    --> src/advanced_features.rs:208:11
[INFO] [stderr]     |
[INFO] [stderr] 208 |     trait Wizard {
[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: trait `OutlinePrint` is never used
[INFO] [stderr]    --> src/advanced_features.rs:268:11
[INFO] [stderr]     |
[INFO] [stderr] 268 |     trait OutlinePrint: fmt::Display {
[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: trait `Write` is never used
[INFO] [stderr]    --> src/advanced_features.rs:339:15
[INFO] [stderr]     |
[INFO] [stderr] 339 |     pub trait Write {
[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: non-local `macro_rules!` definition, they should be avoided as they go against expectation
[INFO] [stderr]    --> src/advanced_features.rs:491:5
[INFO] [stderr]     |
[INFO] [stderr] 491 | /     macro_rules! my_vec {
[INFO] [stderr] 492 | |         ( $( $x: expr ), * ) => {
[INFO] [stderr] 493 | |             {
[INFO] [stderr] 494 | |                 let mut temp_vec = Vec::new();
[INFO] [stderr] ...   |
[INFO] [stderr] 500 | |         }
[INFO] [stderr] 501 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = help: remove the `#[macro_export]` or move this `macro_rules!` outside the of the current function `macros1`
[INFO] [stderr]     = note: a `macro_rules!` definition is non-local if it is nested inside an item and has a `#[macro_export]` attribute
[INFO] [stderr]     = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module
[INFO] [stderr]     = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
[INFO] [stderr]     = note: `#[warn(non_local_definitions)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_study` (lib) generated 119 warnings (run `cargo fix --lib -p rust_study` to apply 7 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: cannot test inner items
[INFO] [stderr]    --> src/tests.rs:100:5
[INFO] [stderr]     |
[INFO] [stderr] 100 |     #[test]
[INFO] [stderr]     |     ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unnameable_test_items)]` on by default
[INFO] [stderr]     = note: this warning originates in the attribute macro `test` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused 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: `rust_study` (bin "rust_study") generated 1 warning (1 duplicate)
[INFO] [stderr] warning: `rust_study` (lib test) generated 123 warnings (119 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/rust_study-3f40f487bfae0760)
[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 src/tests.rs:42:9:
[INFO] [stdout] Greeting did not contain name, value was `Hello!`
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x55ddca7ef655 - std::backtrace_rs::backtrace::libunwind::trace::h59d96bdb08384354
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
[INFO] [stdout]    1:     0x55ddca7ef655 - std::backtrace_rs::backtrace::trace_unsynchronized::h9cf5becacfc93fba
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stdout]    2:     0x55ddca7ef655 - std::sys_common::backtrace::_print_fmt::h10b76d10405dbd48
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/sys_common/backtrace.rs:68:5
[INFO] [stdout]    3:     0x55ddca7ef655 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h6ed9e62a156d84e4
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/sys_common/backtrace.rs:44:22
[INFO] [stdout]    4:     0x55ddca815e9b - core::fmt::rt::Argument::fmt::h645c680983f03c9f
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/core/src/fmt/rt.rs:165:63
[INFO] [stdout]    5:     0x55ddca815e9b - core::fmt::write::h8bcd80919a02be29
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/core/src/fmt/mod.rs:1169:21
[INFO] [stdout]    6:     0x55ddca7ece8f - std::io::Write::write_fmt::h8d0c47c662cad79c
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/io/mod.rs:1835:15
[INFO] [stdout]    7:     0x55ddca7ef42e - std::sys_common::backtrace::_print::h6306f131a28d62b0
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/sys_common/backtrace.rs:47:5
[INFO] [stdout]    8:     0x55ddca7ef42e - std::sys_common::backtrace::print::h7079288e0a26dfcc
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/sys_common/backtrace.rs:34:9
[INFO] [stdout]    9:     0x55ddca7f0e59 - std::panicking::default_hook::{{closure}}::hb063ecec81a736ba
[INFO] [stdout]   10:     0x55ddca7f0b1e - std::panicking::default_hook::hd56ee406bf547b5c
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panicking.rs:295:9
[INFO] [stdout]   11:     0x55ddca7c1d7a - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::he5eacdef44c8728f
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/alloc/src/boxed.rs:2036:9
[INFO] [stdout]   12:     0x55ddca7c1d7a - test::test_main::{{closure}}::h0ec9aed229e79095
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/test/src/lib.rs:137:21
[INFO] [stdout]   13:     0x55ddca7f145b - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hcbd0d80e1ad4e4f9
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/alloc/src/boxed.rs:2036:9
[INFO] [stdout]   14:     0x55ddca7f145b - std::panicking::rust_panic_with_hook::h624aa3ca42ebb8f2
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panicking.rs:799:13
[INFO] [stdout]   15:     0x55ddca7f11d4 - std::panicking::begin_panic_handler::{{closure}}::hbc4e76194a5e287c
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panicking.rs:664:13
[INFO] [stdout]   16:     0x55ddca7efb19 - std::sys_common::backtrace::__rust_end_short_backtrace::h847fedc9d1ff7b6d
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/sys_common/backtrace.rs:171:18
[INFO] [stdout]   17:     0x55ddca7f0f07 - rust_begin_unwind
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panicking.rs:652:5
[INFO] [stdout]   18:     0x55ddca787843 - core::panicking::panic_fmt::hec11a924b87ce965
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/core/src/panicking.rs:72:14
[INFO] [stdout]   19:     0x55ddca78e369 - rust_study::tests::tests::greeting_contains_name::h9ee09aae223b85f9
[INFO] [stdout]                                at /opt/rustwide/workdir/src/tests.rs:42:9
[INFO] [stdout]   20:     0x55ddca78e217 - rust_study::tests::tests::greeting_contains_name::{{closure}}::h8cac2333ae843b1d
[INFO] [stdout]                                at /opt/rustwide/workdir/src/tests.rs:39:32
[INFO] [stdout]   21:     0x55ddca788af6 - core::ops::function::FnOnce::call_once::h533e1956416a1bc1
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   22:     0x55ddca7c675b - core::ops::function::FnOnce::call_once::h2e43a8f6f3d94b99
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   23:     0x55ddca7c675b - test::__rust_begin_short_backtrace::h214c9f2d2d3fee90
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/test/src/lib.rs:625:18
[INFO] [stdout]   24:     0x55ddca7c5e61 - test::run_test_in_process::{{closure}}::h510b7ba7990692a5
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/test/src/lib.rs:648:60
[INFO] [stdout]   25:     0x55ddca7c5e61 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h4157186197a93871
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stdout]   26:     0x55ddca7c5e61 - std::panicking::try::do_call::h1bf2463bccd4b28c
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panicking.rs:559:40
[INFO] [stdout]   27:     0x55ddca7c5e61 - std::panicking::try::hd6d4808c9fab4fa5
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panicking.rs:523:19
[INFO] [stdout]   28:     0x55ddca7c5e61 - std::panic::catch_unwind::hd5641d97d123f9f2
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panic.rs:149:14
[INFO] [stdout]   29:     0x55ddca7c5e61 - test::run_test_in_process::hc273b71c8b878a4c
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/test/src/lib.rs:648:27
[INFO] [stdout]   30:     0x55ddca7c5e61 - test::run_test::{{closure}}::h6838df834eb8467e
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/test/src/lib.rs:569:43
[INFO] [stdout]   31:     0x55ddca78e824 - test::run_test::{{closure}}::h608b98ecff5665fb
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/test/src/lib.rs:599:41
[INFO] [stdout]   32:     0x55ddca78e824 - std::sys_common::backtrace::__rust_begin_short_backtrace::hdc4182b97d1042e9
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/sys_common/backtrace.rs:155:18
[INFO] [stdout]   33:     0x55ddca793252 - std::thread::Builder::spawn_unchecked_::{{closure}}::{{closure}}::h571773fd21d674c8
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/thread/mod.rs:542:17
[INFO] [stdout]   34:     0x55ddca793252 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::hdcd384cf2fa70ba3
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stdout]   35:     0x55ddca793252 - std::panicking::try::do_call::h4f1a44bd81423be1
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panicking.rs:559:40
[INFO] [stdout]   36:     0x55ddca793252 - std::panicking::try::h5e02afcb81dcd361
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panicking.rs:523:19
[INFO] [stdout]   37:     0x55ddca793252 - std::panic::catch_unwind::h022f75775bfd8c45
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/panic.rs:149:14
[INFO] [stdout]   38:     0x55ddca793252 - std::thread::Builder::spawn_unchecked_::{{closure}}::hf5a62e9e4e6df1f8
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/thread/mod.rs:541:30
[INFO] [stdout]   39:     0x55ddca793252 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h6d56360aeb9509a7
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   40:     0x55ddca7f563b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h7a343dc551c06baa
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/alloc/src/boxed.rs:2022:9
[INFO] [stdout]   41:     0x55ddca7f563b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h30b8111cbaa644f3
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/alloc/src/boxed.rs:2022:9
[INFO] [stdout]   42:     0x55ddca7f563b - std::sys::pal::unix::thread::Thread::new::thread_start::h7404e134e61e7a11
[INFO] [stdout]                                at /rustc/1871252fc8bb672d40787e67404e6eaae7059369/library/std/src/sys/pal/unix/thread.rs:108:17
[INFO] [stdout]   43:     0x7f1cedc98ac3 - <unknown>
[INFO] [stdout]   44:     0x7f1cedd29a04 - __clone
[INFO] [stdout]   45:                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] [stderr] error: test failed, to rerun pass `--lib`
[INFO] running `Command { std: "docker" "inspect" "3ad53c3c9fe5aa3ed33e4f9a27d82a4cb7fcfbcd3685af13a58f93e3b1bc466d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3ad53c3c9fe5aa3ed33e4f9a27d82a4cb7fcfbcd3685af13a58f93e3b1bc466d", kill_on_drop: false }`
[INFO] [stdout] 3ad53c3c9fe5aa3ed33e4f9a27d82a4cb7fcfbcd3685af13a58f93e3b1bc466d
[INFO] testing lazylook2/rust_study against try#b642703cf9526da1e72c0b6755753b939a9c6b6d for pr-125151
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flazylook2%2Frust_study" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lazylook2/rust_study on toolchain b642703cf9526da1e72c0b6755753b939a9c6b6d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b642703cf9526da1e72c0b6755753b939a9c6b6d" "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-4-tc2/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" "+b642703cf9526da1e72c0b6755753b939a9c6b6d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+b642703cf9526da1e72c0b6755753b939a9c6b6d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 26505df483a16d0c3838ae5afebc736e4f1350660c46860668dbaa7c5e97bbef
[INFO] running `Command { std: "docker" "start" "-a" "26505df483a16d0c3838ae5afebc736e4f1350660c46860668dbaa7c5e97bbef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "26505df483a16d0c3838ae5afebc736e4f1350660c46860668dbaa7c5e97bbef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26505df483a16d0c3838ae5afebc736e4f1350660c46860668dbaa7c5e97bbef", kill_on_drop: false }`
[INFO] [stdout] 26505df483a16d0c3838ae5afebc736e4f1350660c46860668dbaa7c5e97bbef
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+b642703cf9526da1e72c0b6755753b939a9c6b6d" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ec85096679025f9466122fa0b4e5504d11790f54f3373c5a4bfdb1d646d25b06
[INFO] running `Command { std: "docker" "start" "-a" "ec85096679025f9466122fa0b4e5504d11790f54f3373c5a4bfdb1d646d25b06", 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: 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: 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: 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: 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: 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: 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: 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: fields `0` and `1` are never read
[INFO] [stdout]   --> src/structs.rs:45:18
[INFO] [stdout]    |
[INFO] [stdout] 45 |     struct Color(i32, i32, i32);
[INFO] [stdout]    |            ----- ^^^  ^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            fields in this struct
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 45 |     struct Color((), (), i32);
[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] 61 |     impl Rectangle {
[INFO] [stdout]    |     -------------- method in this implementation
[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: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Int(i32),
[INFO] [stdout]    |         --- ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Int(()),
[INFO] [stdout]    |             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:35:15
[INFO] [stdout]    |
[INFO] [stdout] 35 |         Float(f64),
[INFO] [stdout]    |         ----- ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 35 |         Float(()),
[INFO] [stdout]    |               ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:36:14
[INFO] [stdout]    |
[INFO] [stdout] 36 |         Text(String),
[INFO] [stdout]    |         ---- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 36 |         Text(()),
[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 items `new` and `value` are never used
[INFO] [stdout]    --> src/error.rs:109:16
[INFO] [stdout]     |
[INFO] [stdout] 108 |     impl Guess {
[INFO] [stdout]     |     ---------- associated items in this implementation
[INFO] [stdout] 109 |         pub fn new(value: i32) -> Guess {
[INFO] [stdout]     |                ^^^
[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: method `mixup` is never used
[INFO] [stdout]   --> src/generics_trait.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 54 |     impl<T, U> Point1<T, U> {
[INFO] [stdout]    |     ----------------------- method in this implementation
[INFO] [stdout] 55 |         fn mixup<V, W>(self, other: Point1<V, W>) -> Point1<T, W> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `teacher` is never used
[INFO] [stdout]   --> src/generics_trait.rs:73:15
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub trait teacher {
[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: method `announce_and_return_part` is never used
[INFO] [stdout]    --> src/generics_trait.rs:298:12
[INFO] [stdout]     |
[INFO] [stdout] 295 |     impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]     |     ----------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 298 |         fn announce_and_return_part(&self, announcement: &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: 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 items `new` and `value` are never used
[INFO] [stdout]   --> src/iterators_closures.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 42 |     impl<T> Cacher<T> where T: Fn(u32) -> u32
[INFO] [stdout]    |     ----------------------------------------- associated items in this implementation
[INFO] [stdout] 43 |     {
[INFO] [stdout] 44 |         fn new (calculation: T) -> Cacher<T>{
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 47 |         fn value (&mut self, arg: u32) -> u32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/pointers.rs:146:14
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Cons(i32, Rc<List>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Cons((), ()),
[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: fields `0` and `1` are never read
[INFO] [stdout]    --> src/pointers.rs:253:14
[INFO] [stdout]     |
[INFO] [stdout] 253 |         Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout]     |         ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 253 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]    --> src/pointers.rs:272:10
[INFO] [stdout]     |
[INFO] [stdout] 272 |     enum List {
[INFO] [stdout]     |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `tail` is never used
[INFO] [stdout]    --> src/pointers.rs:278:12
[INFO] [stdout]     |
[INFO] [stdout] 277 |     impl List {
[INFO] [stdout]     |     --------- method in this implementation
[INFO] [stdout] 278 |         fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stdout]     |            ^^^^
[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: fields `width`, `height`, and `label` are never read
[INFO] [stdout]   --> src/object_oriented.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 75 |     pub struct Button {
[INFO] [stdout]    |                ------ fields in this struct
[INFO] [stdout] 76 |         pub width: u32,
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout] 77 |         pub height: u32,
[INFO] [stdout]    |             ^^^^^^
[INFO] [stdout] 78 |         pub label: String
[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: struct `Post` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:134:16
[INFO] [stdout]     |
[INFO] [stdout] 134 |     pub struct Post {
[INFO] [stdout]     |                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add_text`, `content`, `request_review`, and `approve` are never used
[INFO] [stdout]    --> src/object_oriented.rs:139:16
[INFO] [stdout]     |
[INFO] [stdout] 138 |     impl Post {
[INFO] [stdout]     |     --------- associated items in this implementation
[INFO] [stdout] 139 |         pub fn new () -> Post{
[INFO] [stdout]     |                ^^^
[INFO] [stdout] ...
[INFO] [stdout] 143 |         pub fn add_text(&mut self, text: &str) {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 152 |         pub fn content(&self) -> &str{
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 155 |         pub fn request_review(&mut self){
[INFO] [stdout]     |                ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 162 |         pub fn approve(&mut self){
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `State` is never used
[INFO] [stdout]    --> src/object_oriented.rs:170:11
[INFO] [stdout]     |
[INFO] [stdout] 170 |     trait State {
[INFO] [stdout]     |           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Draft` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:178:13
[INFO] [stdout]     |
[INFO] [stdout] 178 |     struct  Draft {}
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PendingReview` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:188:12
[INFO] [stdout]     |
[INFO] [stdout] 188 |     struct PendingReview {}
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Published` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:198:12
[INFO] [stdout]     |
[INFO] [stdout] 198 |     struct Published {}
[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: trait `Wizard` is never used
[INFO] [stdout]    --> src/advanced_features.rs:208:11
[INFO] [stdout]     |
[INFO] [stdout] 208 |     trait Wizard {
[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: trait `OutlinePrint` is never used
[INFO] [stdout]    --> src/advanced_features.rs:268:11
[INFO] [stdout]     |
[INFO] [stdout] 268 |     trait OutlinePrint: fmt::Display {
[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: trait `Write` is never used
[INFO] [stdout]    --> src/advanced_features.rs:339:15
[INFO] [stdout]     |
[INFO] [stdout] 339 |     pub trait Write {
[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: non-local `macro_rules!` definition, they should be avoided as they go against expectation
[INFO] [stdout]    --> src/advanced_features.rs:491:5
[INFO] [stdout]     |
[INFO] [stdout] 491 | /     macro_rules! my_vec {
[INFO] [stdout] 492 | |         ( $( $x: expr ), * ) => {
[INFO] [stdout] 493 | |             {
[INFO] [stdout] 494 | |                 let mut temp_vec = Vec::new();
[INFO] [stdout] ...   |
[INFO] [stdout] 500 | |         }
[INFO] [stdout] 501 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout]     |
[INFO] [stdout]     = help: remove the `#[macro_export]` or move this `macro_rules!` outside the of the current function `macros1`
[INFO] [stdout]     = note: a `macro_rules!` definition is non-local if it is nested inside an item and has a `#[macro_export]` attribute
[INFO] [stdout]     = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module
[INFO] [stdout]     = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
[INFO] [stdout]     = note: `#[warn(non_local_definitions)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 119 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` profile [unoptimized + debuginfo] target(s) in 0.68s
[INFO] running `Command { std: "docker" "inspect" "ec85096679025f9466122fa0b4e5504d11790f54f3373c5a4bfdb1d646d25b06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ec85096679025f9466122fa0b4e5504d11790f54f3373c5a4bfdb1d646d25b06", kill_on_drop: false }`
[INFO] [stdout] ec85096679025f9466122fa0b4e5504d11790f54f3373c5a4bfdb1d646d25b06
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+b642703cf9526da1e72c0b6755753b939a9c6b6d" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6e6511c16e0df94096a3b8f1ce950977408e4d2b75ab582184afa8daa9582675
[INFO] running `Command { std: "docker" "start" "-a" "6e6511c16e0df94096a3b8f1ce950977408e4d2b75ab582184afa8daa9582675", 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: 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: 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: 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: 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: 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: 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: 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: fields `0` and `1` are never read
[INFO] [stdout]   --> src/structs.rs:45:18
[INFO] [stdout]    |
[INFO] [stdout] 45 |     struct Color(i32, i32, i32);
[INFO] [stdout]    |            ----- ^^^  ^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            fields in this struct
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 45 |     struct Color((), (), i32);
[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] 61 |     impl Rectangle {
[INFO] [stdout]    |     -------------- method in this implementation
[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: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Int(i32),
[INFO] [stdout]    |         --- ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Int(()),
[INFO] [stdout]    |             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:35:15
[INFO] [stdout]    |
[INFO] [stdout] 35 |         Float(f64),
[INFO] [stdout]    |         ----- ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 35 |         Float(()),
[INFO] [stdout]    |               ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:36:14
[INFO] [stdout]    |
[INFO] [stdout] 36 |         Text(String),
[INFO] [stdout]    |         ---- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 36 |         Text(()),
[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 items `new` and `value` are never used
[INFO] [stdout]    --> src/error.rs:109:16
[INFO] [stdout]     |
[INFO] [stdout] 108 |     impl Guess {
[INFO] [stdout]     |     ---------- associated items in this implementation
[INFO] [stdout] 109 |         pub fn new(value: i32) -> Guess {
[INFO] [stdout]     |                ^^^
[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: method `mixup` is never used
[INFO] [stdout]   --> src/generics_trait.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 54 |     impl<T, U> Point1<T, U> {
[INFO] [stdout]    |     ----------------------- method in this implementation
[INFO] [stdout] 55 |         fn mixup<V, W>(self, other: Point1<V, W>) -> Point1<T, W> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `teacher` is never used
[INFO] [stdout]   --> src/generics_trait.rs:73:15
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub trait teacher {
[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: method `announce_and_return_part` is never used
[INFO] [stdout]    --> src/generics_trait.rs:298:12
[INFO] [stdout]     |
[INFO] [stdout] 295 |     impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]     |     ----------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 298 |         fn announce_and_return_part(&self, announcement: &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: 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 items `new` and `value` are never used
[INFO] [stdout]   --> src/iterators_closures.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 42 |     impl<T> Cacher<T> where T: Fn(u32) -> u32
[INFO] [stdout]    |     ----------------------------------------- associated items in this implementation
[INFO] [stdout] 43 |     {
[INFO] [stdout] 44 |         fn new (calculation: T) -> Cacher<T>{
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 47 |         fn value (&mut self, arg: u32) -> u32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/pointers.rs:146:14
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Cons(i32, Rc<List>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Cons((), ()),
[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: fields `0` and `1` are never read
[INFO] [stdout]    --> src/pointers.rs:253:14
[INFO] [stdout]     |
[INFO] [stdout] 253 |         Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout]     |         ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 253 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]    --> src/pointers.rs:272:10
[INFO] [stdout]     |
[INFO] [stdout] 272 |     enum List {
[INFO] [stdout]     |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `tail` is never used
[INFO] [stdout]    --> src/pointers.rs:278:12
[INFO] [stdout]     |
[INFO] [stdout] 277 |     impl List {
[INFO] [stdout]     |     --------- method in this implementation
[INFO] [stdout] 278 |         fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stdout]     |            ^^^^
[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: fields `width`, `height`, and `label` are never read
[INFO] [stdout]   --> src/object_oriented.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 75 |     pub struct Button {
[INFO] [stdout]    |                ------ fields in this struct
[INFO] [stdout] 76 |         pub width: u32,
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout] 77 |         pub height: u32,
[INFO] [stdout]    |             ^^^^^^
[INFO] [stdout] 78 |         pub label: String
[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: struct `Post` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:134:16
[INFO] [stdout]     |
[INFO] [stdout] 134 |     pub struct Post {
[INFO] [stdout]     |                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add_text`, `content`, `request_review`, and `approve` are never used
[INFO] [stdout]    --> src/object_oriented.rs:139:16
[INFO] [stdout]     |
[INFO] [stdout] 138 |     impl Post {
[INFO] [stdout]     |     --------- associated items in this implementation
[INFO] [stdout] 139 |         pub fn new () -> Post{
[INFO] [stdout]     |                ^^^
[INFO] [stdout] ...
[INFO] [stdout] 143 |         pub fn add_text(&mut self, text: &str) {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 152 |         pub fn content(&self) -> &str{
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 155 |         pub fn request_review(&mut self){
[INFO] [stdout]     |                ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 162 |         pub fn approve(&mut self){
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `State` is never used
[INFO] [stdout]    --> src/object_oriented.rs:170:11
[INFO] [stdout]     |
[INFO] [stdout] 170 |     trait State {
[INFO] [stdout]     |           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Draft` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:178:13
[INFO] [stdout]     |
[INFO] [stdout] 178 |     struct  Draft {}
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PendingReview` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:188:12
[INFO] [stdout]     |
[INFO] [stdout] 188 |     struct PendingReview {}
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Published` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:198:12
[INFO] [stdout]     |
[INFO] [stdout] 198 |     struct Published {}
[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: trait `Wizard` is never used
[INFO] [stdout]    --> src/advanced_features.rs:208:11
[INFO] [stdout]     |
[INFO] [stdout] 208 |     trait Wizard {
[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: trait `OutlinePrint` is never used
[INFO] [stdout]    --> src/advanced_features.rs:268:11
[INFO] [stdout]     |
[INFO] [stdout] 268 |     trait OutlinePrint: fmt::Display {
[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: trait `Write` is never used
[INFO] [stdout]    --> src/advanced_features.rs:339:15
[INFO] [stdout]     |
[INFO] [stdout] 339 |     pub trait Write {
[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: non-local `macro_rules!` definition, they should be avoided as they go against expectation
[INFO] [stdout]    --> src/advanced_features.rs:491:5
[INFO] [stdout]     |
[INFO] [stdout] 491 | /     macro_rules! my_vec {
[INFO] [stdout] 492 | |         ( $( $x: expr ), * ) => {
[INFO] [stdout] 493 | |             {
[INFO] [stdout] 494 | |                 let mut temp_vec = Vec::new();
[INFO] [stdout] ...   |
[INFO] [stdout] 500 | |         }
[INFO] [stdout] 501 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout]     |
[INFO] [stdout]     = help: remove the `#[macro_export]` or move this `macro_rules!` outside the of the current function `macros1`
[INFO] [stdout]     = note: a `macro_rules!` definition is non-local if it is nested inside an item and has a `#[macro_export]` attribute
[INFO] [stdout]     = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module
[INFO] [stdout]     = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
[INFO] [stdout]     = note: `#[warn(non_local_definitions)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rust_study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: 119 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `advanced_functions1`
[INFO] [stdout]  --> src/main.rs:3:37
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rust_study::advanced_features::{advanced_functions1, macros1};
[INFO] [stdout]   |                                     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `advanced_functions1`
[INFO] [stdout]  --> src/main.rs:3:37
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rust_study::advanced_features::{advanced_functions1, macros1};
[INFO] [stdout]   |                                     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/concurrency.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ErrorKind`, `Error`
[INFO] [stdout]  --> src/error.rs:2:15
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{ErrorKind, Read, Error};
[INFO] [stdout]   |               ^^^^^^^^^        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `teacher` should have an upper camel case name
[INFO] [stdout]   --> src/generics_trait.rs:73:15
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub trait teacher {
[INFO] [stdout]    |               ^^^^^^^ help: convert the identifier to upper camel case: `Teacher`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 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: 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: 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: 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: 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: 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: 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: 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: 1 warning emitted
[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: 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: fields `0` and `1` are never read
[INFO] [stdout]   --> src/structs.rs:45:18
[INFO] [stdout]    |
[INFO] [stdout] 45 |     struct Color(i32, i32, i32);
[INFO] [stdout]    |            ----- ^^^  ^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            fields in this struct
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 45 |     struct Color((), (), i32);
[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] 61 |     impl Rectangle {
[INFO] [stdout]    |     -------------- method in this implementation
[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: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Int(i32),
[INFO] [stdout]    |         --- ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Int(()),
[INFO] [stdout]    |             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:35:15
[INFO] [stdout]    |
[INFO] [stdout] 35 |         Float(f64),
[INFO] [stdout]    |         ----- ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 35 |         Float(()),
[INFO] [stdout]    |               ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections.rs:36:14
[INFO] [stdout]    |
[INFO] [stdout] 36 |         Text(String),
[INFO] [stdout]    |         ---- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 36 |         Text(()),
[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 items `new` and `value` are never used
[INFO] [stdout]    --> src/error.rs:109:16
[INFO] [stdout]     |
[INFO] [stdout] 108 |     impl Guess {
[INFO] [stdout]     |     ---------- associated items in this implementation
[INFO] [stdout] 109 |         pub fn new(value: i32) -> Guess {
[INFO] [stdout]     |                ^^^
[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: method `mixup` is never used
[INFO] [stdout]   --> src/generics_trait.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 54 |     impl<T, U> Point1<T, U> {
[INFO] [stdout]    |     ----------------------- method in this implementation
[INFO] [stdout] 55 |         fn mixup<V, W>(self, other: Point1<V, W>) -> Point1<T, W> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `teacher` is never used
[INFO] [stdout]   --> src/generics_trait.rs:73:15
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub trait teacher {
[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: method `announce_and_return_part` is never used
[INFO] [stdout]    --> src/generics_trait.rs:298:12
[INFO] [stdout]     |
[INFO] [stdout] 295 |     impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]     |     ----------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 298 |         fn announce_and_return_part(&self, announcement: &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: 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 items `new` and `value` are never used
[INFO] [stdout]   --> src/iterators_closures.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 42 |     impl<T> Cacher<T> where T: Fn(u32) -> u32
[INFO] [stdout]    |     ----------------------------------------- associated items in this implementation
[INFO] [stdout] 43 |     {
[INFO] [stdout] 44 |         fn new (calculation: T) -> Cacher<T>{
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 47 |         fn value (&mut self, arg: u32) -> u32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/pointers.rs:146:14
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Cons(i32, Rc<List>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Cons((), ()),
[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: fields `0` and `1` are never read
[INFO] [stdout]    --> src/pointers.rs:253:14
[INFO] [stdout]     |
[INFO] [stdout] 253 |         Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout]     |         ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 253 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]    --> src/pointers.rs:272:10
[INFO] [stdout]     |
[INFO] [stdout] 272 |     enum List {
[INFO] [stdout]     |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `tail` is never used
[INFO] [stdout]    --> src/pointers.rs:278:12
[INFO] [stdout]     |
[INFO] [stdout] 277 |     impl List {
[INFO] [stdout]     |     --------- method in this implementation
[INFO] [stdout] 278 |         fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stdout]     |            ^^^^
[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: fields `width`, `height`, and `label` are never read
[INFO] [stdout]   --> src/object_oriented.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 75 |     pub struct Button {
[INFO] [stdout]    |                ------ fields in this struct
[INFO] [stdout] 76 |         pub width: u32,
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout] 77 |         pub height: u32,
[INFO] [stdout]    |             ^^^^^^
[INFO] [stdout] 78 |         pub label: String
[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: struct `Post` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:134:16
[INFO] [stdout]     |
[INFO] [stdout] 134 |     pub struct Post {
[INFO] [stdout]     |                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add_text`, `content`, `request_review`, and `approve` are never used
[INFO] [stdout]    --> src/object_oriented.rs:139:16
[INFO] [stdout]     |
[INFO] [stdout] 138 |     impl Post {
[INFO] [stdout]     |     --------- associated items in this implementation
[INFO] [stdout] 139 |         pub fn new () -> Post{
[INFO] [stdout]     |                ^^^
[INFO] [stdout] ...
[INFO] [stdout] 143 |         pub fn add_text(&mut self, text: &str) {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 152 |         pub fn content(&self) -> &str{
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 155 |         pub fn request_review(&mut self){
[INFO] [stdout]     |                ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 162 |         pub fn approve(&mut self){
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `State` is never used
[INFO] [stdout]    --> src/object_oriented.rs:170:11
[INFO] [stdout]     |
[INFO] [stdout] 170 |     trait State {
[INFO] [stdout]     |           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Draft` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:178:13
[INFO] [stdout]     |
[INFO] [stdout] 178 |     struct  Draft {}
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PendingReview` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:188:12
[INFO] [stdout]     |
[INFO] [stdout] 188 |     struct PendingReview {}
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Published` is never constructed
[INFO] [stdout]    --> src/object_oriented.rs:198:12
[INFO] [stdout]     |
[INFO] [stdout] 198 |     struct Published {}
[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: trait `Wizard` is never used
[INFO] [stdout]    --> src/advanced_features.rs:208:11
[INFO] [stdout]     |
[INFO] [stdout] 208 |     trait Wizard {
[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: trait `OutlinePrint` is never used
[INFO] [stdout]    --> src/advanced_features.rs:268:11
[INFO] [stdout]     |
[INFO] [stdout] 268 |     trait OutlinePrint: fmt::Display {
[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: trait `Write` is never used
[INFO] [stdout]    --> src/advanced_features.rs:339:15
[INFO] [stdout]     |
[INFO] [stdout] 339 |     pub trait Write {
[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: non-local `macro_rules!` definition, they should be avoided as they go against expectation
[INFO] [stdout]    --> src/advanced_features.rs:491:5
[INFO] [stdout]     |
[INFO] [stdout] 491 | /     macro_rules! my_vec {
[INFO] [stdout] 492 | |         ( $( $x: expr ), * ) => {
[INFO] [stdout] 493 | |             {
[INFO] [stdout] 494 | |                 let mut temp_vec = Vec::new();
[INFO] [stdout] ...   |
[INFO] [stdout] 500 | |         }
[INFO] [stdout] 501 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout]     |
[INFO] [stdout]     = help: remove the `#[macro_export]` or move this `macro_rules!` outside the of the current function `macros1`
[INFO] [stdout]     = note: a `macro_rules!` definition is non-local if it is nested inside an item and has a `#[macro_export]` attribute
[INFO] [stdout]     = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module
[INFO] [stdout]     = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
[INFO] [stdout]     = note: `#[warn(non_local_definitions)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 123 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.40s
[INFO] running `Command { std: "docker" "inspect" "6e6511c16e0df94096a3b8f1ce950977408e4d2b75ab582184afa8daa9582675", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6e6511c16e0df94096a3b8f1ce950977408e4d2b75ab582184afa8daa9582675", kill_on_drop: false }`
[INFO] [stdout] 6e6511c16e0df94096a3b8f1ce950977408e4d2b75ab582184afa8daa9582675
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+b642703cf9526da1e72c0b6755753b939a9c6b6d" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 1ac49fac9aa7f23555105aef521149a45cbdd04dc2a2ec0c5b33dba3447f25d5
[INFO] running `Command { std: "docker" "start" "-a" "1ac49fac9aa7f23555105aef521149a45cbdd04dc2a2ec0c5b33dba3447f25d5", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `std::rc::Rc`
[INFO] [stderr]  --> src/concurrency.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::rc::Rc;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `ErrorKind`, `Error`
[INFO] [stderr]  --> src/error.rs:2:15
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::{ErrorKind, Read, Error};
[INFO] [stderr]   |               ^^^^^^^^^        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `teacher` should have an upper camel case name
[INFO] [stderr]   --> src/generics_trait.rs:73:15
[INFO] [stderr]    |
[INFO] [stderr] 73 |     pub trait teacher {
[INFO] [stderr]    |               ^^^^^^^ help: convert the identifier to upper camel case: `Teacher`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/iterators_closures.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 22 |     /// 完整标注的闭包定义
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 23 |     let add_one_v2 = |x: u32| -> u32 { x + 1 };
[INFO] [stderr]    |     ------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr]    |
[INFO] [stderr]    = 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: 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: 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: 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: 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: 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: 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: 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: fields `0` and `1` are never read
[INFO] [stderr]   --> src/structs.rs:45:18
[INFO] [stderr]    |
[INFO] [stderr] 45 |     struct Color(i32, i32, i32);
[INFO] [stderr]    |            ----- ^^^  ^^^
[INFO] [stderr]    |            |
[INFO] [stderr]    |            fields in this struct
[INFO] [stderr]    |
[INFO] [stderr] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stderr]    |
[INFO] [stderr] 45 |     struct Color((), (), i32);
[INFO] [stderr]    |                  ~~  ~~
[INFO] [stderr] 
[INFO] [stderr] warning: method `can_hold` is never used
[INFO] [stderr]   --> src/structs.rs:65:12
[INFO] [stderr]    |
[INFO] [stderr] 61 |     impl Rectangle {
[INFO] [stderr]    |     -------------- method in this implementation
[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: field `0` is never read
[INFO] [stderr]   --> src/collections.rs:34:13
[INFO] [stderr]    |
[INFO] [stderr] 34 |         Int(i32),
[INFO] [stderr]    |         --- ^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         field in this variant
[INFO] [stderr]    |
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 34 |         Int(()),
[INFO] [stderr]    |             ~~
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/collections.rs:35:15
[INFO] [stderr]    |
[INFO] [stderr] 35 |         Float(f64),
[INFO] [stderr]    |         ----- ^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         field in this variant
[INFO] [stderr]    |
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 35 |         Float(()),
[INFO] [stderr]    |               ~~
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/collections.rs:36:14
[INFO] [stderr]    |
[INFO] [stderr] 36 |         Text(String),
[INFO] [stderr]    |         ---- ^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         field in this variant
[INFO] [stderr]    |
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 36 |         Text(()),
[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 items `new` and `value` are never used
[INFO] [stderr]    --> src/error.rs:109:16
[INFO] [stderr]     |
[INFO] [stderr] 108 |     impl Guess {
[INFO] [stderr]     |     ---------- associated items in this implementation
[INFO] [stderr] 109 |         pub fn new(value: i32) -> Guess {
[INFO] [stderr]     |                ^^^
[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: method `mixup` is never used
[INFO] [stderr]   --> src/generics_trait.rs:55:12
[INFO] [stderr]    |
[INFO] [stderr] 54 |     impl<T, U> Point1<T, U> {
[INFO] [stderr]    |     ----------------------- method in this implementation
[INFO] [stderr] 55 |         fn mixup<V, W>(self, other: Point1<V, W>) -> Point1<T, W> {
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `teacher` is never used
[INFO] [stderr]   --> src/generics_trait.rs:73:15
[INFO] [stderr]    |
[INFO] [stderr] 73 |     pub trait teacher {
[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: method `announce_and_return_part` is never used
[INFO] [stderr]    --> src/generics_trait.rs:298:12
[INFO] [stderr]     |
[INFO] [stderr] 295 |     impl<'a> ImportantExcerpt<'a> {
[INFO] [stderr]     |     ----------------------------- method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 298 |         fn announce_and_return_part(&self, announcement: &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: 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 items `new` and `value` are never used
[INFO] [stderr]   --> src/iterators_closures.rs:44:12
[INFO] [stderr]    |
[INFO] [stderr] 42 |     impl<T> Cacher<T> where T: Fn(u32) -> u32
[INFO] [stderr]    |     ----------------------------------------- associated items in this implementation
[INFO] [stderr] 43 |     {
[INFO] [stderr] 44 |         fn new (calculation: T) -> Cacher<T>{
[INFO] [stderr]    |            ^^^
[INFO] [stderr] ...
[INFO] [stderr] 47 |         fn value (&mut self, arg: u32) -> u32 {
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: fields `0` and `1` are never read
[INFO] [stderr]    --> src/pointers.rs:146:14
[INFO] [stderr]     |
[INFO] [stderr] 146 |         Cons(i32, Rc<List>),
[INFO] [stderr]     |         ---- ^^^  ^^^^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         fields in this variant
[INFO] [stderr]     |
[INFO] [stderr] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stderr]     |
[INFO] [stderr] 146 |         Cons((), ()),
[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: fields `0` and `1` are never read
[INFO] [stderr]    --> src/pointers.rs:253:14
[INFO] [stderr]     |
[INFO] [stderr] 253 |         Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stderr]     |         ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         fields in this variant
[INFO] [stderr]     |
[INFO] [stderr] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stderr]     |
[INFO] [stderr] 253 |         Cons((), ()),
[INFO] [stderr]     |              ~~  ~~
[INFO] [stderr] 
[INFO] [stderr] warning: enum `List` is never used
[INFO] [stderr]    --> src/pointers.rs:272:10
[INFO] [stderr]     |
[INFO] [stderr] 272 |     enum List {
[INFO] [stderr]     |          ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `tail` is never used
[INFO] [stderr]    --> src/pointers.rs:278:12
[INFO] [stderr]     |
[INFO] [stderr] 277 |     impl List {
[INFO] [stderr]     |     --------- method in this implementation
[INFO] [stderr] 278 |         fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stderr]     |            ^^^^
[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: fields `width`, `height`, and `label` are never read
[INFO] [stderr]   --> src/object_oriented.rs:76:13
[INFO] [stderr]    |
[INFO] [stderr] 75 |     pub struct Button {
[INFO] [stderr]    |                ------ fields in this struct
[INFO] [stderr] 76 |         pub width: u32,
[INFO] [stderr]    |             ^^^^^
[INFO] [stderr] 77 |         pub height: u32,
[INFO] [stderr]    |             ^^^^^^
[INFO] [stderr] 78 |         pub label: String
[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: struct `Post` is never constructed
[INFO] [stderr]    --> src/object_oriented.rs:134:16
[INFO] [stderr]     |
[INFO] [stderr] 134 |     pub struct Post {
[INFO] [stderr]     |                ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new`, `add_text`, `content`, `request_review`, and `approve` are never used
[INFO] [stderr]    --> src/object_oriented.rs:139:16
[INFO] [stderr]     |
[INFO] [stderr] 138 |     impl Post {
[INFO] [stderr]     |     --------- associated items in this implementation
[INFO] [stderr] 139 |         pub fn new () -> Post{
[INFO] [stderr]     |                ^^^
[INFO] [stderr] ...
[INFO] [stderr] 143 |         pub fn add_text(&mut self, text: &str) {
[INFO] [stderr]     |                ^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 152 |         pub fn content(&self) -> &str{
[INFO] [stderr]     |                ^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 155 |         pub fn request_review(&mut self){
[INFO] [stderr]     |                ^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 162 |         pub fn approve(&mut self){
[INFO] [stderr]     |                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `State` is never used
[INFO] [stderr]    --> src/object_oriented.rs:170:11
[INFO] [stderr]     |
[INFO] [stderr] 170 |     trait State {
[INFO] [stderr]     |           ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Draft` is never constructed
[INFO] [stderr]    --> src/object_oriented.rs:178:13
[INFO] [stderr]     |
[INFO] [stderr] 178 |     struct  Draft {}
[INFO] [stderr]     |             ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `PendingReview` is never constructed
[INFO] [stderr]    --> src/object_oriented.rs:188:12
[INFO] [stderr]     |
[INFO] [stderr] 188 |     struct PendingReview {}
[INFO] [stderr]     |            ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Published` is never constructed
[INFO] [stderr]    --> src/object_oriented.rs:198:12
[INFO] [stderr]     |
[INFO] [stderr] 198 |     struct Published {}
[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: trait `Wizard` is never used
[INFO] [stderr]    --> src/advanced_features.rs:208:11
[INFO] [stderr]     |
[INFO] [stderr] 208 |     trait Wizard {
[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: trait `OutlinePrint` is never used
[INFO] [stderr]    --> src/advanced_features.rs:268:11
[INFO] [stderr]     |
[INFO] [stderr] 268 |     trait OutlinePrint: fmt::Display {
[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: trait `Write` is never used
[INFO] [stderr]    --> src/advanced_features.rs:339:15
[INFO] [stderr]     |
[INFO] [stderr] 339 |     pub trait Write {
[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: non-local `macro_rules!` definition, they should be avoided as they go against expectation
[INFO] [stderr]    --> src/advanced_features.rs:491:5
[INFO] [stderr]     |
[INFO] [stderr] 491 | /     macro_rules! my_vec {
[INFO] [stderr] 492 | |         ( $( $x: expr ), * ) => {
[INFO] [stderr] 493 | |             {
[INFO] [stderr] 494 | |                 let mut temp_vec = Vec::new();
[INFO] [stderr] ...   |
[INFO] [stderr] 500 | |         }
[INFO] [stderr] 501 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = help: remove the `#[macro_export]` or move this `macro_rules!` outside the of the current function `macros1`
[INFO] [stderr]     = note: a `macro_rules!` definition is non-local if it is nested inside an item and has a `#[macro_export]` attribute
[INFO] [stderr]     = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module
[INFO] [stderr]     = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
[INFO] [stderr]     = note: `#[warn(non_local_definitions)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_study` (lib) generated 119 warnings (run `cargo fix --lib -p rust_study` to apply 7 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: cannot test inner items
[INFO] [stderr]    --> src/tests.rs:100:5
[INFO] [stderr]     |
[INFO] [stderr] 100 |     #[test]
[INFO] [stderr]     |     ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unnameable_test_items)]` on by default
[INFO] [stderr]     = note: this warning originates in the attribute macro `test` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused 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: `rust_study` (bin "rust_study") generated 1 warning (1 duplicate)
[INFO] [stderr] warning: `rust_study` (lib test) generated 123 warnings (119 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/rust_study-3f40f487bfae0760)
[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 src/tests.rs:42:9:
[INFO] [stdout] Greeting did not contain name, value was `Hello!`
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x55ed042a96f5 - std::backtrace_rs::backtrace::libunwind::trace::he49dc9a9e3164223
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
[INFO] [stdout]    1:     0x55ed042a96f5 - std::backtrace_rs::backtrace::trace_unsynchronized::h3a3e77c68030aa6b
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stdout]    2:     0x55ed042a96f5 - std::sys_common::backtrace::_print_fmt::h9479ad2f99afd5d4
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/sys_common/backtrace.rs:68:5
[INFO] [stdout]    3:     0x55ed042a96f5 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hfb01aa1fa3fb1821
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/sys_common/backtrace.rs:44:22
[INFO] [stdout]    4:     0x55ed042cfedb - core::fmt::rt::Argument::fmt::h125e56152abbc1c3
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/core/src/fmt/rt.rs:165:63
[INFO] [stdout]    5:     0x55ed042cfedb - core::fmt::write::hb0ab4ff05ccfe741
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/core/src/fmt/mod.rs:1169:21
[INFO] [stdout]    6:     0x55ed042a6fdf - std::io::Write::write_fmt::hea6336dbf2fa00b8
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/io/mod.rs:1835:15
[INFO] [stdout]    7:     0x55ed042a94ce - std::sys_common::backtrace::_print::h79ca548f3a2adf4b
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/sys_common/backtrace.rs:47:5
[INFO] [stdout]    8:     0x55ed042a94ce - std::sys_common::backtrace::print::h9aebf997b2fea2d3
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/sys_common/backtrace.rs:34:9
[INFO] [stdout]    9:     0x55ed042aae39 - std::panicking::default_hook::{{closure}}::h68a0954af2694526
[INFO] [stdout]   10:     0x55ed042aab8c - std::panicking::default_hook::h5be50cc6849ffb00
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/panicking.rs:295:9
[INFO] [stdout]   11:     0x55ed0427be4f - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hd874405dcbd1d3ed
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/alloc/src/boxed.rs:2036:9
[INFO] [stdout]   12:     0x55ed0427be4f - test::test_main::{{closure}}::h4f26a9df34a84b94
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/test/src/lib.rs:137:21
[INFO] [stdout]   13:     0x55ed042ab43b - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h00e96d9c62aa9a12
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/alloc/src/boxed.rs:2036:9
[INFO] [stdout]   14:     0x55ed042ab43b - std::panicking::rust_panic_with_hook::h3c0df6036729334c
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/panicking.rs:799:13
[INFO] [stdout]   15:     0x55ed042ab1b4 - std::panicking::begin_panic_handler::{{closure}}::ha3a21e93c4cfd807
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/panicking.rs:664:13
[INFO] [stdout]   16:     0x55ed042a9bb9 - std::sys_common::backtrace::__rust_end_short_backtrace::h19508a8f8ae71dc9
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/sys_common/backtrace.rs:171:18
[INFO] [stdout]   17:     0x55ed042aaee7 - rust_begin_unwind
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/panicking.rs:652:5
[INFO] [stdout]   18:     0x55ed04241823 - core::panicking::panic_fmt::h2ba8af99174d83ea
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/core/src/panicking.rs:72:14
[INFO] [stdout]   19:     0x55ed04248349 - rust_study::tests::tests::greeting_contains_name::hf00c289aa5858963
[INFO] [stdout]                                at /opt/rustwide/workdir/src/tests.rs:42:9
[INFO] [stdout]   20:     0x55ed042481f7 - rust_study::tests::tests::greeting_contains_name::{{closure}}::h9b38f092c48eb735
[INFO] [stdout]                                at /opt/rustwide/workdir/src/tests.rs:39:32
[INFO] [stdout]   21:     0x55ed04242a96 - core::ops::function::FnOnce::call_once::ha767eacb394bddb8
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   22:     0x55ed0428076b - core::ops::function::FnOnce::call_once::h18c6bf92212b87a4
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   23:     0x55ed0428076b - test::__rust_begin_short_backtrace::hdcf0edcfa9080086
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/test/src/lib.rs:625:18
[INFO] [stdout]   24:     0x55ed0427fe31 - test::run_test_in_process::{{closure}}::heac2c4eb375d2d10
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/test/src/lib.rs:648:60
[INFO] [stdout]   25:     0x55ed0427fe31 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h0289bafc8a1cc004
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stdout]   26:     0x55ed0427fe31 - std::panicking::try::do_call::h5e158f1ad8a5f983
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/panicking.rs:559:40
[INFO] [stdout]   27:     0x55ed0427fe31 - std::panicking::try::hea3411d60321c4de
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/panicking.rs:523:19
[INFO] [stdout]   28:     0x55ed0427fe31 - std::panic::catch_unwind::hafb7bb18bc47bbc7
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/panic.rs:149:14
[INFO] [stdout]   29:     0x55ed0427fe31 - test::run_test_in_process::h74dd138dc7762d99
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/test/src/lib.rs:648:27
[INFO] [stdout]   30:     0x55ed0427fe31 - test::run_test::{{closure}}::h6b390822e63606cf
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/test/src/lib.rs:569:43
[INFO] [stdout]   31:     0x55ed04248804 - test::run_test::{{closure}}::h6e11dba8131d354b
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/test/src/lib.rs:599:41
[INFO] [stdout]   32:     0x55ed04248804 - std::sys_common::backtrace::__rust_begin_short_backtrace::ha71b3541b59bdbbb
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/sys_common/backtrace.rs:155:18
[INFO] [stdout]   33:     0x55ed0424d2d2 - std::thread::Builder::spawn_unchecked_::{{closure}}::{{closure}}::hef92127c5ef9e53c
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/thread/mod.rs:542:17
[INFO] [stdout]   34:     0x55ed0424d2d2 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h859c109f9d11c92b
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stdout]   35:     0x55ed0424d2d2 - std::panicking::try::do_call::hbf534c458cd858f0
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/panicking.rs:559:40
[INFO] [stdout]   36:     0x55ed0424d2d2 - std::panicking::try::h65c18365a7b9ad90
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/panicking.rs:523:19
[INFO] [stdout]   37:     0x55ed0424d2d2 - std::panic::catch_unwind::h21b25d4c69478c39
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/panic.rs:149:14
[INFO] [stdout]   38:     0x55ed0424d2d2 - std::thread::Builder::spawn_unchecked_::{{closure}}::h23335f620275a9bf
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/thread/mod.rs:541:30
[INFO] [stdout]   39:     0x55ed0424d2d2 - core::ops::function::FnOnce::call_once{{vtable.shim}}::hb491dc55513e9b7c
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   40:     0x55ed042af60b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h41b39260afcffdc9
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/alloc/src/boxed.rs:2022:9
[INFO] [stdout]   41:     0x55ed042af60b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h6694c8dc6dd010c4
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/alloc/src/boxed.rs:2022:9
[INFO] [stdout]   42:     0x55ed042af60b - std::sys::pal::unix::thread::Thread::new::thread_start::hf16038e1c8e19c99
[INFO] [stdout]                                at /rustc/b642703cf9526da1e72c0b6755753b939a9c6b6d/library/std/src/sys/pal/unix/thread.rs:108:17
[INFO] [stdout]   43:     0x7f0bf6410ac3 - <unknown>
[INFO] [stdout]   44:     0x7f0bf64a1a04 - __clone
[INFO] [stdout]   45:                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] [stderr] error: test failed, to rerun pass `--lib`
[INFO] running `Command { std: "docker" "inspect" "1ac49fac9aa7f23555105aef521149a45cbdd04dc2a2ec0c5b33dba3447f25d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ac49fac9aa7f23555105aef521149a45cbdd04dc2a2ec0c5b33dba3447f25d5", kill_on_drop: false }`
[INFO] [stdout] 1ac49fac9aa7f23555105aef521149a45cbdd04dc2a2ec0c5b33dba3447f25d5
