[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] checking lazylook2/rust_study against try#a7a572ce3edd6d476191fbfe92c9c1986e009b34 for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flazylook2%2Frust_study" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lazylook2/rust_study on toolchain a7a572ce3edd6d476191fbfe92c9c1986e009b34
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "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-8/source/Cargo.toml
[INFO] crate git repo https://github.com/lazylook2/rust_study already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 551828bf40d261341f1e1616d8dd3b341f4260929298feb3c11da795bebfed19
[INFO] running `Command { std: "docker" "start" "-a" "551828bf40d261341f1e1616d8dd3b341f4260929298feb3c11da795bebfed19", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "551828bf40d261341f1e1616d8dd3b341f4260929298feb3c11da795bebfed19", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "551828bf40d261341f1e1616d8dd3b341f4260929298feb3c11da795bebfed19", kill_on_drop: false }`
[INFO] [stdout] 551828bf40d261341f1e1616d8dd3b341f4260929298feb3c11da795bebfed19
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eb475e1cd140fef4430eb785205d8cfa51d110a399b9511e7f469015346b7d80
[INFO] running `Command { std: "docker" "start" "-a" "eb475e1cd140fef4430eb785205d8cfa51d110a399b9511e7f469015346b7d80", kill_on_drop: false }`
[INFO] [stderr] Copying to /tmp/fixit
[INFO] [stderr] Running `cargo fix --edition`
[INFO] [stderr]     Checking rust_study v0.1.0 (/tmp/fixit)
[INFO] [stderr]    Migrating src/lib.rs from 2018 edition to 2021
[INFO] [stderr]        Fixed src/enum_match.rs (3 fixes)
[INFO] [stderr]        Fixed src/concurrency.rs (1 fix)
[INFO] [stderr]        Fixed src/patterns.rs (2 fixes)
[INFO] [stderr]        Fixed src/common.rs (2 fixes)
[INFO] [stderr]        Fixed src/object_oriented.rs (1 fix)
[INFO] [stderr]        Fixed src/generics_trait.rs (8 fixes)
[INFO] [stderr]        Fixed src/error.rs (3 fixes)
[INFO] [stderr]        Fixed src/advanced_features.rs (3 fixes)
[INFO] [stderr]        Fixed src/iterators_closures.rs (2 fixes)
[INFO] [stderr]        Fixed src/pointers.rs (9 fixes)
[INFO] [stderr]        Fixed src/structs.rs (2 fixes)
[INFO] [stderr]        Fixed src/collections.rs (14 fixes)
[INFO] [stdout] warning: trait `teacher` should have an upper camel case name
[INFO] [stdout]   --> src/generics_trait.rs:73:15
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub trait teacher {
[INFO] [stdout]    |               ^^^^^^^ help: convert the identifier to upper camel case: `Teacher`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/iterators_closures.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     /// 完整标注的闭包定义
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 23 |     let _add_one_v2 = |x: u32| -> u32 { x + 1 };
[INFO] [stdout]    |     -------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/iterators_closures.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | /     /// 闭包定义中省略了类型注解（现在要编译器需要返回类型了，目前编译不通过）
[INFO] [stdout] 25 | |     // let add_one_v3 = |x| { x + 1 };
[INFO] [stdout] 26 | |     /// 去掉了可选的大括号（现在要编译器需要返回类型了，目前编译不通过）
[INFO] [stdout]    | |________________________________________________________________________^
[INFO] [stdout] ...
[INFO] [stdout] 29 |       let example_closure = |x| x;
[INFO] [stdout]    |       ---------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/advanced_features.rs:243:6
[INFO] [stdout]     |
[INFO] [stdout] 243 |     };
[INFO] [stdout]     |      ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]        Fixed src/tests.rs (1 fix)
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/advanced_features.rs:79:5
[INFO] [stdout]    |
[INFO] [stdout] 68 | pub unsafe fn unsafe_rust5() {
[INFO] [stdout]    | ---------------------------- because it's nested under this `unsafe` fn
[INFO] [stdout] ...
[INFO] [stdout] 79 |     unsafe {
[INFO] [stdout]    |     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]  --> src/structs.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |         active: bool,
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user`
[INFO] [stdout]   --> src/structs.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn build_user(username: String) -> User{
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/structs.rs:65:12
[INFO] [stdout]    |
[INFO] [stdout] 65 |         fn can_hold(&self, other: &Rectangle) -> bool{
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]  --> src/enum_match.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 |     enum IpAddKind {V4,V6,}
[INFO] [stdout]   |                        ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]  --> src/enum_match.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |         kind: IpAddKind,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `address`
[INFO] [stdout]  --> src/enum_match.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |         address: String,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]   --> src/enum_match.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         Quit,   // 没有关联任何数据
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]   --> src/enum_match.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         Move {x: i32, y: i32},  // 包含一个匿名结构体
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ChangeColor`
[INFO] [stdout]   --> src/enum_match.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |         ChangeColor(i32, i32, i32), // 包含三个 i32
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `parse_config`
[INFO] [stdout]   --> src/collections.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 49 |     fn parse_config(args: &[String]) -> (&str, &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file1`
[INFO] [stdout]   --> src/error.rs:69:8
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn read_username_from_file1() -> Result<String, io::Error> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Guess`
[INFO] [stdout]    --> src/error.rs:104:16
[INFO] [stdout]     |
[INFO] [stdout] 104 |     pub struct Guess {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/error.rs:109:16
[INFO] [stdout]     |
[INFO] [stdout] 109 |         pub fn new(value: i32) -> Guess {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]    --> src/error.rs:117:16
[INFO] [stdout]     |
[INFO] [stdout] 117 |         pub fn value(&self) -> i32 {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/generics_trait.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |         y: T,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Option`
[INFO] [stdout]   --> src/generics_trait.rs:34:10
[INFO] [stdout]    |
[INFO] [stdout] 34 |     enum Option<T> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Result`
[INFO] [stdout]   --> src/generics_trait.rs:38:10
[INFO] [stdout]    |
[INFO] [stdout] 38 |     enum Result<T, E> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point1`
[INFO] [stdout]   --> src/generics_trait.rs:50:12
[INFO] [stdout]    |
[INFO] [stdout] 50 |     struct Point1<T, U> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `mixup`
[INFO] [stdout]   --> src/generics_trait.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 55 |         fn mixup<V, W>(self, other: Point1<V, W>) -> Point1<T, W> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify`
[INFO] [stdout]    --> src/generics_trait.rs:101:12
[INFO] [stdout]     |
[INFO] [stdout] 101 |     pub fn notify(item: impl School) {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify1`
[INFO] [stdout]    --> src/generics_trait.rs:105:12
[INFO] [stdout]     |
[INFO] [stdout] 105 |     pub fn notify1<T: School>(item: &T) {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify2`
[INFO] [stdout]    --> src/generics_trait.rs:108:12
[INFO] [stdout]     |
[INFO] [stdout] 108 |     pub fn notify2<T: School>(item1: &T, _item2: &T) {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify3`
[INFO] [stdout]    --> src/generics_trait.rs:112:12
[INFO] [stdout]     |
[INFO] [stdout] 112 |     pub fn notify3<T: School + teacher>(item: T) -> String {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_function`
[INFO] [stdout]    --> src/generics_trait.rs:116:8
[INFO] [stdout]     |
[INFO] [stdout] 116 |     fn some_function<T, U>(_t: T, _u: U) -> i32
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `return_school`
[INFO] [stdout]    --> src/generics_trait.rs:123:8
[INFO] [stdout]     |
[INFO] [stdout] 123 |     fn return_school() -> impl School {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest2`
[INFO] [stdout]    --> src/generics_trait.rs:250:8
[INFO] [stdout]     |
[INFO] [stdout] 250 |     fn longest2<'a>(x: &'a str, _y: &str) -> &'a str {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word`
[INFO] [stdout]    --> src/generics_trait.rs:278:8
[INFO] [stdout]     |
[INFO] [stdout] 278 |     fn first_word(s: &str) -> &str {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `announce_and_return_part`
[INFO] [stdout]    --> src/generics_trait.rs:298:12
[INFO] [stdout]     |
[INFO] [stdout] 298 |         fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest_with_an_announcement`
[INFO] [stdout]    --> src/generics_trait.rs:308:8
[INFO] [stdout]     |
[INFO] [stdout] 308 |     fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate`
[INFO] [stdout]  --> src/iterators_closures.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn calculate(a: u32) -> u32 {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_one_v1`
[INFO] [stdout]   --> src/iterators_closures.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn  add_one_v1   (x: u32) -> u32 { x + 1 }
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Cacher`
[INFO] [stdout]   --> src/iterators_closures.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |     struct Cacher<T>
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/iterators_closures.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 44 |         fn new (calculation: T) -> Cacher<T>{
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]   --> src/iterators_closures.rs:47:12
[INFO] [stdout]    |
[INFO] [stdout] 47 |         fn value (&mut self, arg: u32) -> u32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `aa`
[INFO] [stdout]    --> src/pointers.rs:173:17
[INFO] [stdout]     |
[INFO] [stdout] 173 |     struct AA { aa: Rc<i32>, bb: i32 }
[INFO] [stdout]     |                 ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `bb`
[INFO] [stdout]    --> src/pointers.rs:173:30
[INFO] [stdout]     |
[INFO] [stdout] 173 |     struct AA { aa: Rc<i32>, bb: i32 }
[INFO] [stdout]     |                              ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cons`
[INFO] [stdout]    --> src/pointers.rs:273:9
[INFO] [stdout]     |
[INFO] [stdout] 273 |         Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nil`
[INFO] [stdout]    --> src/pointers.rs:274:9
[INFO] [stdout]     |
[INFO] [stdout] 274 |         Nil,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]    --> src/pointers.rs:278:12
[INFO] [stdout]     |
[INFO] [stdout] 278 |         fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]   --> src/object_oriented.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |         width: u32,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]   --> src/object_oriented.rs:87:9
[INFO] [stdout]    |
[INFO] [stdout] 87 |         height: u32,
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `options`
[INFO] [stdout]   --> src/object_oriented.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 88 |         options: Vec<String>,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `state`
[INFO] [stdout]    --> src/object_oriented.rs:135:9
[INFO] [stdout]     |
[INFO] [stdout] 135 |         state: Option<Box<dyn State>>, // 使用Option应该是状态，可以换为其他状态还可以清空为NONE
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/object_oriented.rs:139:16
[INFO] [stdout]     |
[INFO] [stdout] 139 |         pub fn new () -> Post{
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_text`
[INFO] [stdout]    --> src/object_oriented.rs:143:16
[INFO] [stdout]     |
[INFO] [stdout] 143 |         pub fn add_text(&mut self, text: &str) {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `content`
[INFO] [stdout]    --> src/object_oriented.rs:152:16
[INFO] [stdout]     |
[INFO] [stdout] 152 |         pub fn content(&self) -> &str{
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `request_review`
[INFO] [stdout]    --> src/object_oriented.rs:155:16
[INFO] [stdout]     |
[INFO] [stdout] 155 |         pub fn request_review(&mut self){
[INFO] [stdout]     |                ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `approve`
[INFO] [stdout]    --> src/object_oriented.rs:162:16
[INFO] [stdout]     |
[INFO] [stdout] 162 |         pub fn approve(&mut self){
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> src/patterns.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]    --> src/patterns.rs:127:9
[INFO] [stdout]     |
[INFO] [stdout] 127 |         Move { x: i32, y: i32},
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]    --> src/patterns.rs:128:9
[INFO] [stdout]     |
[INFO] [stdout] 128 |         Write (String),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Rgb`
[INFO] [stdout]    --> src/patterns.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 140 |         Rgb(i32, i32, i32),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> src/patterns.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 144 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]    --> src/patterns.rs:145:9
[INFO] [stdout]     |
[INFO] [stdout] 145 |         Move { x: i32, y: i32 },
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]    --> src/patterns.rs:146:9
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Write(String),
[INFO] [stdout]     |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `split_at_mut1`
[INFO] [stdout]   --> src/advanced_features.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn split_at_mut1(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unsafe_rust6`
[INFO] [stdout]   --> src/advanced_features.rs:86:4
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn unsafe_rust6() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]    --> src/advanced_features.rs:242:9
[INFO] [stdout]     |
[INFO] [stdout] 242 |         name: String
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Result`
[INFO] [stdout]    --> src/advanced_features.rs:338:5
[INFO] [stdout]     |
[INFO] [stdout] 338 |     type Result<T> = std::result::Result<T, std::io::Error>;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Stop`
[INFO] [stdout]    --> src/advanced_features.rs:453:9
[INFO] [stdout]     |
[INFO] [stdout] 453 |         Stop,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `returns_closure`
[INFO] [stdout]    --> src/advanced_features.rs:481:8
[INFO] [stdout]     |
[INFO] [stdout] 481 |     fn returns_closure() -> Box<dyn Fn(i32) -> i32> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `String1` should have a snake case name
[INFO] [stdout]   --> src/collections.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub fn String1() {
[INFO] [stdout]    |        ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `string1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Closures` should have a snake case name
[INFO] [stdout]  --> src/iterators_closures.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn Closures() {
[INFO] [stdout]   |        ^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `closures`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Iterator` should have a snake case name
[INFO] [stdout]    --> src/iterators_closures.rs:102:8
[INFO] [stdout]     |
[INFO] [stdout] 102 | pub fn Iterator() {
[INFO] [stdout]     |        ^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `iterator`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Rc` should have a snake case name
[INFO] [stdout]    --> src/pointers.rs:143:8
[INFO] [stdout]     |
[INFO] [stdout] 143 | pub fn Rc () {
[INFO] [stdout]     |        ^^ help: convert the identifier to snake case: `rc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 70 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `teacher` should have an upper camel case name
[INFO] [stdout]   --> src/generics_trait.rs:73:15
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub trait teacher {
[INFO] [stdout]    |               ^^^^^^^ help: convert the identifier to upper camel case: `Teacher`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/iterators_closures.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     /// 完整标注的闭包定义
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 23 |     let _add_one_v2 = |x: u32| -> u32 { x + 1 };
[INFO] [stdout]    |     -------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/iterators_closures.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | /     /// 闭包定义中省略了类型注解（现在要编译器需要返回类型了，目前编译不通过）
[INFO] [stdout] 25 | |     // let add_one_v3 = |x| { x + 1 };
[INFO] [stdout] 26 | |     /// 去掉了可选的大括号（现在要编译器需要返回类型了，目前编译不通过）
[INFO] [stdout]    | |________________________________________________________________________^
[INFO] [stdout] ...
[INFO] [stdout] 29 |       let example_closure = |x| x;
[INFO] [stdout]    |       ---------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/advanced_features.rs:243:6
[INFO] [stdout]     |
[INFO] [stdout] 243 |     };
[INFO] [stdout]     |      ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Migrating tests/integration_test.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/main.rs from 2018 edition to 2021
[INFO] [stderr]        Fixed src/main.rs (1 fix)
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/advanced_features.rs:79:5
[INFO] [stdout]    |
[INFO] [stdout] 68 | pub unsafe fn unsafe_rust5() {
[INFO] [stdout]    | ---------------------------- because it's nested under this `unsafe` fn
[INFO] [stdout] ...
[INFO] [stdout] 79 |     unsafe {
[INFO] [stdout]    |     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]  --> src/structs.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |         active: bool,
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user`
[INFO] [stdout]   --> src/structs.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn build_user(username: String) -> User{
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/structs.rs:65:12
[INFO] [stdout]    |
[INFO] [stdout] 65 |         fn can_hold(&self, other: &Rectangle) -> bool{
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]  --> src/enum_match.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 |     enum IpAddKind {V4,V6,}
[INFO] [stdout]   |                        ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]  --> src/enum_match.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |         kind: IpAddKind,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `address`
[INFO] [stdout]  --> src/enum_match.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |         address: String,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]   --> src/enum_match.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         Quit,   // 没有关联任何数据
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]   --> src/enum_match.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         Move {x: i32, y: i32},  // 包含一个匿名结构体
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ChangeColor`
[INFO] [stdout]   --> src/enum_match.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |         ChangeColor(i32, i32, i32), // 包含三个 i32
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `parse_config`
[INFO] [stdout]   --> src/collections.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 49 |     fn parse_config(args: &[String]) -> (&str, &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file1`
[INFO] [stdout]   --> src/error.rs:69:8
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn read_username_from_file1() -> Result<String, io::Error> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Guess`
[INFO] [stdout]    --> src/error.rs:104:16
[INFO] [stdout]     |
[INFO] [stdout] 104 |     pub struct Guess {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/error.rs:109:16
[INFO] [stdout]     |
[INFO] [stdout] 109 |         pub fn new(value: i32) -> Guess {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]    --> src/error.rs:117:16
[INFO] [stdout]     |
[INFO] [stdout] 117 |         pub fn value(&self) -> i32 {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/generics_trait.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |         y: T,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Option`
[INFO] [stdout]   --> src/generics_trait.rs:34:10
[INFO] [stdout]    |
[INFO] [stdout] 34 |     enum Option<T> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Result`
[INFO] [stdout]   --> src/generics_trait.rs:38:10
[INFO] [stdout]    |
[INFO] [stdout] 38 |     enum Result<T, E> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point1`
[INFO] [stdout]   --> src/generics_trait.rs:50:12
[INFO] [stdout]    |
[INFO] [stdout] 50 |     struct Point1<T, U> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `mixup`
[INFO] [stdout]   --> src/generics_trait.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 55 |         fn mixup<V, W>(self, other: Point1<V, W>) -> Point1<T, W> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify`
[INFO] [stdout]    --> src/generics_trait.rs:101:12
[INFO] [stdout]     |
[INFO] [stdout] 101 |     pub fn notify(item: impl School) {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify1`
[INFO] [stdout]    --> src/generics_trait.rs:105:12
[INFO] [stdout]     |
[INFO] [stdout] 105 |     pub fn notify1<T: School>(item: &T) {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify2`
[INFO] [stdout]    --> src/generics_trait.rs:108:12
[INFO] [stdout]     |
[INFO] [stdout] 108 |     pub fn notify2<T: School>(item1: &T, _item2: &T) {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify3`
[INFO] [stdout]    --> src/generics_trait.rs:112:12
[INFO] [stdout]     |
[INFO] [stdout] 112 |     pub fn notify3<T: School + teacher>(item: T) -> String {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_function`
[INFO] [stdout]    --> src/generics_trait.rs:116:8
[INFO] [stdout]     |
[INFO] [stdout] 116 |     fn some_function<T, U>(_t: T, _u: U) -> i32
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `return_school`
[INFO] [stdout]    --> src/generics_trait.rs:123:8
[INFO] [stdout]     |
[INFO] [stdout] 123 |     fn return_school() -> impl School {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest2`
[INFO] [stdout]    --> src/generics_trait.rs:250:8
[INFO] [stdout]     |
[INFO] [stdout] 250 |     fn longest2<'a>(x: &'a str, _y: &str) -> &'a str {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word`
[INFO] [stdout]    --> src/generics_trait.rs:278:8
[INFO] [stdout]     |
[INFO] [stdout] 278 |     fn first_word(s: &str) -> &str {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `announce_and_return_part`
[INFO] [stdout]    --> src/generics_trait.rs:298:12
[INFO] [stdout]     |
[INFO] [stdout] 298 |         fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest_with_an_announcement`
[INFO] [stdout]    --> src/generics_trait.rs:308:8
[INFO] [stdout]     |
[INFO] [stdout] 308 |     fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]   --> src/tests.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |         value: i32,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `expensive_test`
[INFO] [stdout]    --> src/tests.rs:102:8
[INFO] [stdout]     |
[INFO] [stdout] 102 |     fn expensive_test() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate`
[INFO] [stdout]  --> src/iterators_closures.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn calculate(a: u32) -> u32 {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_one_v1`
[INFO] [stdout]   --> src/iterators_closures.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn  add_one_v1   (x: u32) -> u32 { x + 1 }
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Cacher`
[INFO] [stdout]   --> src/iterators_closures.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |     struct Cacher<T>
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/iterators_closures.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 44 |         fn new (calculation: T) -> Cacher<T>{
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]   --> src/iterators_closures.rs:47:12
[INFO] [stdout]    |
[INFO] [stdout] 47 |         fn value (&mut self, arg: u32) -> u32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `aa`
[INFO] [stdout]    --> src/pointers.rs:173:17
[INFO] [stdout]     |
[INFO] [stdout] 173 |     struct AA { aa: Rc<i32>, bb: i32 }
[INFO] [stdout]     |                 ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `bb`
[INFO] [stdout]    --> src/pointers.rs:173:30
[INFO] [stdout]     |
[INFO] [stdout] 173 |     struct AA { aa: Rc<i32>, bb: i32 }
[INFO] [stdout]     |                              ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cons`
[INFO] [stdout]    --> src/pointers.rs:273:9
[INFO] [stdout]     |
[INFO] [stdout] 273 |         Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nil`
[INFO] [stdout]    --> src/pointers.rs:274:9
[INFO] [stdout]     |
[INFO] [stdout] 274 |         Nil,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]    --> src/pointers.rs:278:12
[INFO] [stdout]     |
[INFO] [stdout] 278 |         fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]   --> src/object_oriented.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |         width: u32,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]   --> src/object_oriented.rs:87:9
[INFO] [stdout]    |
[INFO] [stdout] 87 |         height: u32,
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `options`
[INFO] [stdout]   --> src/object_oriented.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 88 |         options: Vec<String>,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `state`
[INFO] [stdout]    --> src/object_oriented.rs:135:9
[INFO] [stdout]     |
[INFO] [stdout] 135 |         state: Option<Box<dyn State>>, // 使用Option应该是状态，可以换为其他状态还可以清空为NONE
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/object_oriented.rs:139:16
[INFO] [stdout]     |
[INFO] [stdout] 139 |         pub fn new () -> Post{
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_text`
[INFO] [stdout]    --> src/object_oriented.rs:143:16
[INFO] [stdout]     |
[INFO] [stdout] 143 |         pub fn add_text(&mut self, text: &str) {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `content`
[INFO] [stdout]    --> src/object_oriented.rs:152:16
[INFO] [stdout]     |
[INFO] [stdout] 152 |         pub fn content(&self) -> &str{
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `request_review`
[INFO] [stdout]    --> src/object_oriented.rs:155:16
[INFO] [stdout]     |
[INFO] [stdout] 155 |         pub fn request_review(&mut self){
[INFO] [stdout]     |                ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `approve`
[INFO] [stdout]    --> src/object_oriented.rs:162:16
[INFO] [stdout]     |
[INFO] [stdout] 162 |         pub fn approve(&mut self){
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> src/patterns.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]    --> src/patterns.rs:127:9
[INFO] [stdout]     |
[INFO] [stdout] 127 |         Move { x: i32, y: i32},
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]    --> src/patterns.rs:128:9
[INFO] [stdout]     |
[INFO] [stdout] 128 |         Write (String),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Rgb`
[INFO] [stdout]    --> src/patterns.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 140 |         Rgb(i32, i32, i32),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> src/patterns.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 144 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]    --> src/patterns.rs:145:9
[INFO] [stdout]     |
[INFO] [stdout] 145 |         Move { x: i32, y: i32 },
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]    --> src/patterns.rs:146:9
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Write(String),
[INFO] [stdout]     |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `split_at_mut1`
[INFO] [stdout]   --> src/advanced_features.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn split_at_mut1(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unsafe_rust6`
[INFO] [stdout]   --> src/advanced_features.rs:86:4
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn unsafe_rust6() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]    --> src/advanced_features.rs:242:9
[INFO] [stdout]     |
[INFO] [stdout] 242 |         name: String
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Result`
[INFO] [stdout]    --> src/advanced_features.rs:338:5
[INFO] [stdout]     |
[INFO] [stdout] 338 |     type Result<T> = std::result::Result<T, std::io::Error>;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Stop`
[INFO] [stdout]    --> src/advanced_features.rs:453:9
[INFO] [stdout]     |
[INFO] [stdout] 453 |         Stop,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `returns_closure`
[INFO] [stdout]    --> src/advanced_features.rs:481:8
[INFO] [stdout]     |
[INFO] [stdout] 481 |     fn returns_closure() -> Box<dyn Fn(i32) -> i32> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: cannot test inner items
[INFO] [stdout]    --> src/tests.rs:100:5
[INFO] [stdout]     |
[INFO] [stdout] 100 |     #[test]
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unnameable_test_items)]` on by default
[INFO] [stdout]     = note: this warning originates in the attribute macro `test` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `String1` should have a snake case name
[INFO] [stdout]   --> src/collections.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub fn String1() {
[INFO] [stdout]    |        ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `string1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Closures` should have a snake case name
[INFO] [stdout]  --> src/iterators_closures.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn Closures() {
[INFO] [stdout]   |        ^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `closures`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Iterator` should have a snake case name
[INFO] [stdout]    --> src/iterators_closures.rs:102:8
[INFO] [stdout]     |
[INFO] [stdout] 102 | pub fn Iterator() {
[INFO] [stdout]     |        ^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `iterator`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Rc` should have a snake case name
[INFO] [stdout]    --> src/pointers.rs:143:8
[INFO] [stdout]     |
[INFO] [stdout] 143 | pub fn Rc () {
[INFO] [stdout]     |        ^^ help: convert the identifier to snake case: `rc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 73 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.21s
[INFO] [stderr] Running `cargo check` to verify 2021
[INFO] [stderr]     Checking rust_study v0.1.0 (/tmp/fixit)
[INFO] [stdout] warning: trait `teacher` should have an upper camel case name
[INFO] [stdout]   --> src/generics_trait.rs:73:15
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub trait teacher {
[INFO] [stdout]    |               ^^^^^^^ help: convert the identifier to upper camel case: `Teacher`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/iterators_closures.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     /// 完整标注的闭包定义
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 23 |     let _add_one_v2 = |x: u32| -> u32 { x + 1 };
[INFO] [stdout]    |     -------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/iterators_closures.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | /     /// 闭包定义中省略了类型注解（现在要编译器需要返回类型了，目前编译不通过）
[INFO] [stdout] 25 | |     // let add_one_v3 = |x| { x + 1 };
[INFO] [stdout] 26 | |     /// 去掉了可选的大括号（现在要编译器需要返回类型了，目前编译不通过）
[INFO] [stdout]    | |________________________________________________________________________^
[INFO] [stdout] ...
[INFO] [stdout] 29 |       let example_closure = |x| x;
[INFO] [stdout]    |       ---------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/advanced_features.rs:243:6
[INFO] [stdout]     |
[INFO] [stdout] 243 |     };
[INFO] [stdout]     |      ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `teacher` should have an upper camel case name
[INFO] [stdout]   --> src/generics_trait.rs:73:15
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub trait teacher {
[INFO] [stdout]    |               ^^^^^^^ help: convert the identifier to upper camel case: `Teacher`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/iterators_closures.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     /// 完整标注的闭包定义
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 23 |     let _add_one_v2 = |x: u32| -> u32 { x + 1 };
[INFO] [stdout]    |     -------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/iterators_closures.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | /     /// 闭包定义中省略了类型注解（现在要编译器需要返回类型了，目前编译不通过）
[INFO] [stdout] 25 | |     // let add_one_v3 = |x| { x + 1 };
[INFO] [stdout] 26 | |     /// 去掉了可选的大括号（现在要编译器需要返回类型了，目前编译不通过）
[INFO] [stdout]    | |________________________________________________________________________^
[INFO] [stdout] ...
[INFO] [stdout] 29 |       let example_closure = |x| x;
[INFO] [stdout]    |       ---------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/advanced_features.rs:243:6
[INFO] [stdout]     |
[INFO] [stdout] 243 |     };
[INFO] [stdout]     |      ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/advanced_features.rs:79:5
[INFO] [stdout]    |
[INFO] [stdout] 68 | pub unsafe fn unsafe_rust5() {
[INFO] [stdout]    | ---------------------------- because it's nested under this `unsafe` fn
[INFO] [stdout] ...
[INFO] [stdout] 79 |     unsafe {
[INFO] [stdout]    |     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]  --> src/structs.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |         active: bool,
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user`
[INFO] [stdout]   --> src/structs.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn build_user(username: String) -> User{
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/structs.rs:65:12
[INFO] [stdout]    |
[INFO] [stdout] 65 |         fn can_hold(&self, other: &Rectangle) -> bool{
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]  --> src/enum_match.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 |     enum IpAddKind {V4,V6,}
[INFO] [stdout]   |                        ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]  --> src/enum_match.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |         kind: IpAddKind,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `address`
[INFO] [stdout]  --> src/enum_match.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |         address: String,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]   --> src/enum_match.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         Quit,   // 没有关联任何数据
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]   --> src/enum_match.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         Move {x: i32, y: i32},  // 包含一个匿名结构体
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ChangeColor`
[INFO] [stdout]   --> src/enum_match.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |         ChangeColor(i32, i32, i32), // 包含三个 i32
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `parse_config`
[INFO] [stdout]   --> src/collections.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 49 |     fn parse_config(args: &[String]) -> (&str, &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file1`
[INFO] [stdout]   --> src/error.rs:69:8
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn read_username_from_file1() -> Result<String, io::Error> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Guess`
[INFO] [stdout]    --> src/error.rs:104:16
[INFO] [stdout]     |
[INFO] [stdout] 104 |     pub struct Guess {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/error.rs:109:16
[INFO] [stdout]     |
[INFO] [stdout] 109 |         pub fn new(value: i32) -> Guess {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]    --> src/error.rs:117:16
[INFO] [stdout]     |
[INFO] [stdout] 117 |         pub fn value(&self) -> i32 {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/generics_trait.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |         y: T,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Option`
[INFO] [stdout]   --> src/generics_trait.rs:34:10
[INFO] [stdout]    |
[INFO] [stdout] 34 |     enum Option<T> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Result`
[INFO] [stdout]   --> src/generics_trait.rs:38:10
[INFO] [stdout]    |
[INFO] [stdout] 38 |     enum Result<T, E> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point1`
[INFO] [stdout]   --> src/generics_trait.rs:50:12
[INFO] [stdout]    |
[INFO] [stdout] 50 |     struct Point1<T, U> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `mixup`
[INFO] [stdout]   --> src/generics_trait.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 55 |         fn mixup<V, W>(self, other: Point1<V, W>) -> Point1<T, W> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify`
[INFO] [stdout]    --> src/generics_trait.rs:101:12
[INFO] [stdout]     |
[INFO] [stdout] 101 |     pub fn notify(item: impl School) {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify1`
[INFO] [stdout]    --> src/generics_trait.rs:105:12
[INFO] [stdout]     |
[INFO] [stdout] 105 |     pub fn notify1<T: School>(item: &T) {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify2`
[INFO] [stdout]    --> src/generics_trait.rs:108:12
[INFO] [stdout]     |
[INFO] [stdout] 108 |     pub fn notify2<T: School>(item1: &T, _item2: &T) {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify3`
[INFO] [stdout]    --> src/generics_trait.rs:112:12
[INFO] [stdout]     |
[INFO] [stdout] 112 |     pub fn notify3<T: School + teacher>(item: T) -> String {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_function`
[INFO] [stdout]    --> src/generics_trait.rs:116:8
[INFO] [stdout]     |
[INFO] [stdout] 116 |     fn some_function<T, U>(_t: T, _u: U) -> i32
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `return_school`
[INFO] [stdout]    --> src/generics_trait.rs:123:8
[INFO] [stdout]     |
[INFO] [stdout] 123 |     fn return_school() -> impl School {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest2`
[INFO] [stdout]    --> src/generics_trait.rs:250:8
[INFO] [stdout]     |
[INFO] [stdout] 250 |     fn longest2<'a>(x: &'a str, _y: &str) -> &'a str {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word`
[INFO] [stdout]    --> src/generics_trait.rs:278:8
[INFO] [stdout]     |
[INFO] [stdout] 278 |     fn first_word(s: &str) -> &str {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `announce_and_return_part`
[INFO] [stdout]    --> src/generics_trait.rs:298:12
[INFO] [stdout]     |
[INFO] [stdout] 298 |         fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest_with_an_announcement`
[INFO] [stdout]    --> src/generics_trait.rs:308:8
[INFO] [stdout]     |
[INFO] [stdout] 308 |     fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate`
[INFO] [stdout]  --> src/iterators_closures.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn calculate(a: u32) -> u32 {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_one_v1`
[INFO] [stdout]   --> src/iterators_closures.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn  add_one_v1   (x: u32) -> u32 { x + 1 }
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Cacher`
[INFO] [stdout]   --> src/iterators_closures.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |     struct Cacher<T>
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/iterators_closures.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 44 |         fn new (calculation: T) -> Cacher<T>{
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]   --> src/iterators_closures.rs:47:12
[INFO] [stdout]    |
[INFO] [stdout] 47 |         fn value (&mut self, arg: u32) -> u32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `aa`
[INFO] [stdout]    --> src/pointers.rs:173:17
[INFO] [stdout]     |
[INFO] [stdout] 173 |     struct AA { aa: Rc<i32>, bb: i32 }
[INFO] [stdout]     |                 ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `bb`
[INFO] [stdout]    --> src/pointers.rs:173:30
[INFO] [stdout]     |
[INFO] [stdout] 173 |     struct AA { aa: Rc<i32>, bb: i32 }
[INFO] [stdout]     |                              ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cons`
[INFO] [stdout]    --> src/pointers.rs:273:9
[INFO] [stdout]     |
[INFO] [stdout] 273 |         Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nil`
[INFO] [stdout]    --> src/pointers.rs:274:9
[INFO] [stdout]     |
[INFO] [stdout] 274 |         Nil,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]    --> src/pointers.rs:278:12
[INFO] [stdout]     |
[INFO] [stdout] 278 |         fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]   --> src/object_oriented.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |         width: u32,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]   --> src/object_oriented.rs:87:9
[INFO] [stdout]    |
[INFO] [stdout] 87 |         height: u32,
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `options`
[INFO] [stdout]   --> src/object_oriented.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 88 |         options: Vec<String>,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `state`
[INFO] [stdout]    --> src/object_oriented.rs:135:9
[INFO] [stdout]     |
[INFO] [stdout] 135 |         state: Option<Box<dyn State>>, // 使用Option应该是状态，可以换为其他状态还可以清空为NONE
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/object_oriented.rs:139:16
[INFO] [stdout]     |
[INFO] [stdout] 139 |         pub fn new () -> Post{
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_text`
[INFO] [stdout]    --> src/object_oriented.rs:143:16
[INFO] [stdout]     |
[INFO] [stdout] 143 |         pub fn add_text(&mut self, text: &str) {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `content`
[INFO] [stdout]    --> src/object_oriented.rs:152:16
[INFO] [stdout]     |
[INFO] [stdout] 152 |         pub fn content(&self) -> &str{
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `request_review`
[INFO] [stdout]    --> src/object_oriented.rs:155:16
[INFO] [stdout]     |
[INFO] [stdout] 155 |         pub fn request_review(&mut self){
[INFO] [stdout]     |                ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `approve`
[INFO] [stdout]    --> src/object_oriented.rs:162:16
[INFO] [stdout]     |
[INFO] [stdout] 162 |         pub fn approve(&mut self){
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> src/patterns.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]    --> src/patterns.rs:127:9
[INFO] [stdout]     |
[INFO] [stdout] 127 |         Move { x: i32, y: i32},
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]    --> src/patterns.rs:128:9
[INFO] [stdout]     |
[INFO] [stdout] 128 |         Write (String),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Rgb`
[INFO] [stdout]    --> src/patterns.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 140 |         Rgb(i32, i32, i32),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> src/patterns.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 144 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]    --> src/patterns.rs:145:9
[INFO] [stdout]     |
[INFO] [stdout] 145 |         Move { x: i32, y: i32 },
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]    --> src/patterns.rs:146:9
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Write(String),
[INFO] [stdout]     |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `split_at_mut1`
[INFO] [stdout]   --> src/advanced_features.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn split_at_mut1(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unsafe_rust6`
[INFO] [stdout]   --> src/advanced_features.rs:86:4
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn unsafe_rust6() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]    --> src/advanced_features.rs:242:9
[INFO] [stdout]     |
[INFO] [stdout] 242 |         name: String
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Result`
[INFO] [stdout]    --> src/advanced_features.rs:338:5
[INFO] [stdout]     |
[INFO] [stdout] 338 |     type Result<T> = std::result::Result<T, std::io::Error>;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Stop`
[INFO] [stdout]    --> src/advanced_features.rs:453:9
[INFO] [stdout]     |
[INFO] [stdout] 453 |         Stop,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `returns_closure`
[INFO] [stdout]    --> src/advanced_features.rs:481:8
[INFO] [stdout]     |
[INFO] [stdout] 481 |     fn returns_closure() -> Box<dyn Fn(i32) -> i32> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `String1` should have a snake case name
[INFO] [stdout]   --> src/collections.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub fn String1() {
[INFO] [stdout]    |        ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `string1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Closures` should have a snake case name
[INFO] [stdout]  --> src/iterators_closures.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn Closures() {
[INFO] [stdout]   |        ^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `closures`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Iterator` should have a snake case name
[INFO] [stdout]    --> src/iterators_closures.rs:102:8
[INFO] [stdout]     |
[INFO] [stdout] 102 | pub fn Iterator() {
[INFO] [stdout]     |        ^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `iterator`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Rc` should have a snake case name
[INFO] [stdout]    --> src/pointers.rs:143:8
[INFO] [stdout]     |
[INFO] [stdout] 143 | pub fn Rc () {
[INFO] [stdout]     |        ^^ help: convert the identifier to snake case: `rc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 70 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/advanced_features.rs:79:5
[INFO] [stdout]    |
[INFO] [stdout] 68 | pub unsafe fn unsafe_rust5() {
[INFO] [stdout]    | ---------------------------- because it's nested under this `unsafe` fn
[INFO] [stdout] ...
[INFO] [stdout] 79 |     unsafe {
[INFO] [stdout]    |     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]  --> src/structs.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |         active: bool,
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user`
[INFO] [stdout]   --> src/structs.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn build_user(username: String) -> User{
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/structs.rs:65:12
[INFO] [stdout]    |
[INFO] [stdout] 65 |         fn can_hold(&self, other: &Rectangle) -> bool{
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]  --> src/enum_match.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 |     enum IpAddKind {V4,V6,}
[INFO] [stdout]   |                        ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]  --> src/enum_match.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |         kind: IpAddKind,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `address`
[INFO] [stdout]  --> src/enum_match.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |         address: String,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]   --> src/enum_match.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         Quit,   // 没有关联任何数据
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]   --> src/enum_match.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         Move {x: i32, y: i32},  // 包含一个匿名结构体
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ChangeColor`
[INFO] [stdout]   --> src/enum_match.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |         ChangeColor(i32, i32, i32), // 包含三个 i32
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `parse_config`
[INFO] [stdout]   --> src/collections.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 49 |     fn parse_config(args: &[String]) -> (&str, &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file1`
[INFO] [stdout]   --> src/error.rs:69:8
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn read_username_from_file1() -> Result<String, io::Error> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Guess`
[INFO] [stdout]    --> src/error.rs:104:16
[INFO] [stdout]     |
[INFO] [stdout] 104 |     pub struct Guess {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/error.rs:109:16
[INFO] [stdout]     |
[INFO] [stdout] 109 |         pub fn new(value: i32) -> Guess {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]    --> src/error.rs:117:16
[INFO] [stdout]     |
[INFO] [stdout] 117 |         pub fn value(&self) -> i32 {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/generics_trait.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |         y: T,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Option`
[INFO] [stdout]   --> src/generics_trait.rs:34:10
[INFO] [stdout]    |
[INFO] [stdout] 34 |     enum Option<T> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Result`
[INFO] [stdout]   --> src/generics_trait.rs:38:10
[INFO] [stdout]    |
[INFO] [stdout] 38 |     enum Result<T, E> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point1`
[INFO] [stdout]   --> src/generics_trait.rs:50:12
[INFO] [stdout]    |
[INFO] [stdout] 50 |     struct Point1<T, U> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `mixup`
[INFO] [stdout]   --> src/generics_trait.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 55 |         fn mixup<V, W>(self, other: Point1<V, W>) -> Point1<T, W> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify`
[INFO] [stdout]    --> src/generics_trait.rs:101:12
[INFO] [stdout]     |
[INFO] [stdout] 101 |     pub fn notify(item: impl School) {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify1`
[INFO] [stdout]    --> src/generics_trait.rs:105:12
[INFO] [stdout]     |
[INFO] [stdout] 105 |     pub fn notify1<T: School>(item: &T) {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify2`
[INFO] [stdout]    --> src/generics_trait.rs:108:12
[INFO] [stdout]     |
[INFO] [stdout] 108 |     pub fn notify2<T: School>(item1: &T, _item2: &T) {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify3`
[INFO] [stdout]    --> src/generics_trait.rs:112:12
[INFO] [stdout]     |
[INFO] [stdout] 112 |     pub fn notify3<T: School + teacher>(item: T) -> String {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_function`
[INFO] [stdout]    --> src/generics_trait.rs:116:8
[INFO] [stdout]     |
[INFO] [stdout] 116 |     fn some_function<T, U>(_t: T, _u: U) -> i32
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `return_school`
[INFO] [stdout]    --> src/generics_trait.rs:123:8
[INFO] [stdout]     |
[INFO] [stdout] 123 |     fn return_school() -> impl School {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest2`
[INFO] [stdout]    --> src/generics_trait.rs:250:8
[INFO] [stdout]     |
[INFO] [stdout] 250 |     fn longest2<'a>(x: &'a str, _y: &str) -> &'a str {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word`
[INFO] [stdout]    --> src/generics_trait.rs:278:8
[INFO] [stdout]     |
[INFO] [stdout] 278 |     fn first_word(s: &str) -> &str {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `announce_and_return_part`
[INFO] [stdout]    --> src/generics_trait.rs:298:12
[INFO] [stdout]     |
[INFO] [stdout] 298 |         fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest_with_an_announcement`
[INFO] [stdout]    --> src/generics_trait.rs:308:8
[INFO] [stdout]     |
[INFO] [stdout] 308 |     fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]   --> src/tests.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |         value: i32,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `expensive_test`
[INFO] [stdout]    --> src/tests.rs:102:8
[INFO] [stdout]     |
[INFO] [stdout] 102 |     fn expensive_test() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate`
[INFO] [stdout]  --> src/iterators_closures.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn calculate(a: u32) -> u32 {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_one_v1`
[INFO] [stdout]   --> src/iterators_closures.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn  add_one_v1   (x: u32) -> u32 { x + 1 }
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Cacher`
[INFO] [stdout]   --> src/iterators_closures.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |     struct Cacher<T>
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/iterators_closures.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 44 |         fn new (calculation: T) -> Cacher<T>{
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]   --> src/iterators_closures.rs:47:12
[INFO] [stdout]    |
[INFO] [stdout] 47 |         fn value (&mut self, arg: u32) -> u32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `aa`
[INFO] [stdout]    --> src/pointers.rs:173:17
[INFO] [stdout]     |
[INFO] [stdout] 173 |     struct AA { aa: Rc<i32>, bb: i32 }
[INFO] [stdout]     |                 ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `bb`
[INFO] [stdout]    --> src/pointers.rs:173:30
[INFO] [stdout]     |
[INFO] [stdout] 173 |     struct AA { aa: Rc<i32>, bb: i32 }
[INFO] [stdout]     |                              ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cons`
[INFO] [stdout]    --> src/pointers.rs:273:9
[INFO] [stdout]     |
[INFO] [stdout] 273 |         Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nil`
[INFO] [stdout]    --> src/pointers.rs:274:9
[INFO] [stdout]     |
[INFO] [stdout] 274 |         Nil,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]    --> src/pointers.rs:278:12
[INFO] [stdout]     |
[INFO] [stdout] 278 |         fn tail(&self) -> Option<&RefCell<Rc<List>>> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]   --> src/object_oriented.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |         width: u32,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]   --> src/object_oriented.rs:87:9
[INFO] [stdout]    |
[INFO] [stdout] 87 |         height: u32,
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `options`
[INFO] [stdout]   --> src/object_oriented.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 88 |         options: Vec<String>,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `state`
[INFO] [stdout]    --> src/object_oriented.rs:135:9
[INFO] [stdout]     |
[INFO] [stdout] 135 |         state: Option<Box<dyn State>>, // 使用Option应该是状态，可以换为其他状态还可以清空为NONE
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/object_oriented.rs:139:16
[INFO] [stdout]     |
[INFO] [stdout] 139 |         pub fn new () -> Post{
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_text`
[INFO] [stdout]    --> src/object_oriented.rs:143:16
[INFO] [stdout]     |
[INFO] [stdout] 143 |         pub fn add_text(&mut self, text: &str) {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `content`
[INFO] [stdout]    --> src/object_oriented.rs:152:16
[INFO] [stdout]     |
[INFO] [stdout] 152 |         pub fn content(&self) -> &str{
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `request_review`
[INFO] [stdout]    --> src/object_oriented.rs:155:16
[INFO] [stdout]     |
[INFO] [stdout] 155 |         pub fn request_review(&mut self){
[INFO] [stdout]     |                ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `approve`
[INFO] [stdout]    --> src/object_oriented.rs:162:16
[INFO] [stdout]     |
[INFO] [stdout] 162 |         pub fn approve(&mut self){
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> src/patterns.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]    --> src/patterns.rs:127:9
[INFO] [stdout]     |
[INFO] [stdout] 127 |         Move { x: i32, y: i32},
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]    --> src/patterns.rs:128:9
[INFO] [stdout]     |
[INFO] [stdout] 128 |         Write (String),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Rgb`
[INFO] [stdout]    --> src/patterns.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 140 |         Rgb(i32, i32, i32),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> src/patterns.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 144 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]    --> src/patterns.rs:145:9
[INFO] [stdout]     |
[INFO] [stdout] 145 |         Move { x: i32, y: i32 },
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]    --> src/patterns.rs:146:9
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Write(String),
[INFO] [stdout]     |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `split_at_mut1`
[INFO] [stdout]   --> src/advanced_features.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn split_at_mut1(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unsafe_rust6`
[INFO] [stdout]   --> src/advanced_features.rs:86:4
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn unsafe_rust6() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]    --> src/advanced_features.rs:242:9
[INFO] [stdout]     |
[INFO] [stdout] 242 |         name: String
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Result`
[INFO] [stdout]    --> src/advanced_features.rs:338:5
[INFO] [stdout]     |
[INFO] [stdout] 338 |     type Result<T> = std::result::Result<T, std::io::Error>;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Stop`
[INFO] [stdout]    --> src/advanced_features.rs:453:9
[INFO] [stdout]     |
[INFO] [stdout] 453 |         Stop,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `returns_closure`
[INFO] [stdout]    --> src/advanced_features.rs:481:8
[INFO] [stdout]     |
[INFO] [stdout] 481 |     fn returns_closure() -> Box<dyn Fn(i32) -> i32> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: cannot test inner items
[INFO] [stdout]    --> src/tests.rs:100:5
[INFO] [stdout]     |
[INFO] [stdout] 100 |     #[test]
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unnameable_test_items)]` on by default
[INFO] [stdout]     = note: this warning originates in the attribute macro `test` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `String1` should have a snake case name
[INFO] [stdout]   --> src/collections.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub fn String1() {
[INFO] [stdout]    |        ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `string1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Closures` should have a snake case name
[INFO] [stdout]  --> src/iterators_closures.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn Closures() {
[INFO] [stdout]   |        ^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `closures`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Iterator` should have a snake case name
[INFO] [stdout]    --> src/iterators_closures.rs:102:8
[INFO] [stdout]     |
[INFO] [stdout] 102 | pub fn Iterator() {
[INFO] [stdout]     |        ^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `iterator`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Rc` should have a snake case name
[INFO] [stdout]    --> src/pointers.rs:143:8
[INFO] [stdout]     |
[INFO] [stdout] 143 | pub fn Rc () {
[INFO] [stdout]     |        ^^ help: convert the identifier to snake case: `rc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 73 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.92s
[INFO] running `Command { std: "docker" "inspect" "eb475e1cd140fef4430eb785205d8cfa51d110a399b9511e7f469015346b7d80", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb475e1cd140fef4430eb785205d8cfa51d110a399b9511e7f469015346b7d80", kill_on_drop: false }`
[INFO] [stdout] eb475e1cd140fef4430eb785205d8cfa51d110a399b9511e7f469015346b7d80