[INFO] cloning repository https://github.com/hash-sam/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/hash-sam/rust_study" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhash-sam%2Frust_study", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhash-sam%2Frust_study'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a0f21187430050ac08295b00d359e92f0e1d640e
[INFO] checking hash-sam/rust_study against try#8e819ff5434466e9a823e03871a1775ac7d84ddf for pr-156027
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhash-sam%2Frust_study" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/hash-sam/rust_study
[INFO] finished tweaking git repo https://github.com/hash-sam/rust_study
[INFO] tweaked toml for git repo https://github.com/hash-sam/rust_study written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/hash-sam/rust_study on toolchain 8e819ff5434466e9a823e03871a1775ac7d84ddf
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8e819ff5434466e9a823e03871a1775ac7d84ddf" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/hash-sam/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" "+8e819ff5434466e9a823e03871a1775ac7d84ddf" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "start" "-a" "10559b09de89eac38026afd27e0978f70b73940c2bd9c8e084ddf609b13320b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "10559b09de89eac38026afd27e0978f70b73940c2bd9c8e084ddf609b13320b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "10559b09de89eac38026afd27e0978f70b73940c2bd9c8e084ddf609b13320b4", kill_on_drop: false }`
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[INFO] [stdout] 35dfe66d4831819be02044a74c0bc6aeffc5207155d3af3d9f403ba77b18e3bc
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[INFO] [stdout] warning: unused label
[INFO] [stdout]   --> src/control_flow/loops.rs:97:9
[INFO] [stdout]    |
[INFO] [stdout] 97 |         'inner: for y in 0..5 {
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_labels)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::hash_map::DefaultHasher`
[INFO] [stdout]    --> src/collections/hashmaps.rs:214:9
[INFO] [stdout]     |
[INFO] [stdout] 214 |     use std::collections::hash_map::DefaultHasher;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]   --> src/control_flow/loops.rs:97:9
[INFO] [stdout]    |
[INFO] [stdout] 97 |         'inner: for y in 0..5 {
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_labels)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::hash_map::DefaultHasher`
[INFO] [stdout]    --> src/collections/hashmaps.rs:214:9
[INFO] [stdout]     |
[INFO] [stdout] 214 |     use std::collections::hash_map::DefaultHasher;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling pest_derive v2.8.6
[INFO] [stderr]     Checking json5 v0.4.1
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ownership/references_borrowing.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut s = String::from("hello");
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/ownership/references_borrowing.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut s = String::from("hello");
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `origin`
[INFO] [stdout]   --> src/structs_enums/structs.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let origin = Point(0, 0, 0);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_origin`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `subject`
[INFO] [stdout]   --> src/structs_enums/structs.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let subject = AlwaysEqual;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_subject`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `msg3`
[INFO] [stdout]   --> src/structs_enums/enums.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let msg3 = Message::Write(String::from("hello"));
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_msg3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `msg4`
[INFO] [stdout]   --> src/structs_enums/enums.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let msg4 = Message::ChangeColor(255, 0, 0);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_msg4`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `error`
[INFO] [stdout]   --> src/structs_enums/enums.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let error: Result<i32, String> = Err(String::from("出错了"));
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/structs_enums/pattern_matching.rs:226:9
[INFO] [stdout]     |
[INFO] [stdout] 226 |     let y = 10; // 会产生警告
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/collections/vectors.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     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/strings.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let s = 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: `order1`
[INFO] [stdout]    --> src/modules_errors/modules.rs:116:9
[INFO] [stdout]     |
[INFO] [stdout] 116 |     let order1 = back_of_house::Appetizer::Soup;
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order2`
[INFO] [stdout]    --> src/modules_errors/modules.rs:117:9
[INFO] [stdout]     |
[INFO] [stdout] 117 |     let order2 = back_of_house::Appetizer::Salad;
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `body`
[INFO] [stdout]    --> src/advanced/generics.rs:303:24
[INFO] [stdout]     |
[INFO] [stdout] 303 |     fn with_body(self, body: String) -> RequestBuilder<WithBody> {
[INFO] [stdout]     |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_body`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]    --> src/advanced/lifetimes.rs:240:9
[INFO] [stdout]     |
[INFO] [stdout] 240 |     let r1 = &num as *const i32;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]    --> src/advanced/lifetimes.rs:241:9
[INFO] [stdout]     |
[INFO] [stdout] 241 |     let r2 = &mut num as *mut i32;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `absolute_value` is never used
[INFO] [stdout]   --> src/basics/functions.rs:71:4
[INFO] [stdout]    |
[INFO] [stdout] 71 | fn absolute_value(x: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `factorial` is never used
[INFO] [stdout]   --> src/basics/functions.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn factorial(n: u64) -> u64 {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `closure_example` is never used
[INFO] [stdout]   --> src/basics/functions.rs:89:4
[INFO] [stdout]    |
[INFO] [stdout] 89 | fn closure_example() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_length` is never used
[INFO] [stdout]   --> src/ownership/ownership_basics.rs:74:4
[INFO] [stdout]    |
[INFO] [stdout] 74 | fn calculate_length(s: String) -> (String, usize) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_length_with_ref` is never used
[INFO] [stdout]   --> src/ownership/ownership_basics.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn calculate_length_with_ref(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `split_at_space` is never used
[INFO] [stdout]    --> src/ownership/references_borrowing.rs:125:4
[INFO] [stdout]     |
[INFO] [stdout] 125 | fn split_at_space(s: &str) -> (&str, &str) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/structs_enums/structs.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     struct DebugPoint {
[INFO] [stdout]    |            ---------- fields in this struct
[INFO] [stdout] 67 |         x: i32,
[INFO] [stdout]    |         ^
[INFO] [stdout] 68 |         y: i32,
[INFO] [stdout]    |         ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `DebugPoint` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `email` is never read
[INFO] [stdout]   --> src/structs_enums/structs.rs:86:5
[INFO] [stdout]    |
[INFO] [stdout] 84 | struct User {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 85 |     username: String,
[INFO] [stdout] 86 |     email: String,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, and `2` are never read
[INFO] [stdout]   --> src/structs_enums/structs.rs:93:14
[INFO] [stdout]    |
[INFO] [stdout] 93 | struct Point(i32, i32, i32);
[INFO] [stdout]    |        ----- ^^^  ^^^  ^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        fields in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing these fields
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `perimeter` is never used
[INFO] [stdout]    --> src/structs_enums/structs.rs:126:8
[INFO] [stdout]     |
[INFO] [stdout] 125 | impl Rectangle {
[INFO] [stdout]     | -------------- method in this implementation
[INFO] [stdout] 126 |     fn perimeter(&self) -> u32 {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ImportantExcerpt` is never constructed
[INFO] [stdout]    --> src/structs_enums/structs.rs:149:8
[INFO] [stdout]     |
[INFO] [stdout] 149 | struct ImportantExcerpt<'a> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/structs_enums/enums.rs:93:8
[INFO] [stdout]    |
[INFO] [stdout] 93 |     V4(String),
[INFO] [stdout]    |     -- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[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] 93 -     V4(String),
[INFO] [stdout] 93 +     V4(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/structs_enums/enums.rs:94:8
[INFO] [stdout]    |
[INFO] [stdout] 94 |     V6(String),
[INFO] [stdout]    |     -- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[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] 94 -     V6(String),
[INFO] [stdout] 94 +     V6(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/structs_enums/enums.rs:125:12
[INFO] [stdout]     |
[INFO] [stdout] 125 |     Circle(Point, f64), // 圆心和半径
[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] 125 -     Circle(Point, f64), // 圆心和半径
[INFO] [stdout] 125 +     Circle((), f64), // 圆心和半径
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Rectangle` and `Triangle` are never constructed
[INFO] [stdout]    --> src/structs_enums/enums.rs:126:5
[INFO] [stdout]     |
[INFO] [stdout] 124 | enum Shape {
[INFO] [stdout]     |      ----- variants in this enum
[INFO] [stdout] 125 |     Circle(Point, f64), // 圆心和半径
[INFO] [stdout] 126 |     Rectangle(Point, Point), // 两个对角点
[INFO] [stdout]     |     ^^^^^^^^^
[INFO] [stdout] 127 |     Triangle(Point, Point, Point), // 三个顶点
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Alaska` is never constructed
[INFO] [stdout]    --> src/structs_enums/enums.rs:159:5
[INFO] [stdout]     |
[INFO] [stdout] 157 | enum UsState {
[INFO] [stdout]     |      ------- variant in this enum
[INFO] [stdout] 158 |     Alabama,
[INFO] [stdout] 159 |     Alaska,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Penny`, `Nickel`, and `Dime` are never constructed
[INFO] [stdout]    --> src/structs_enums/enums.rs:164:5
[INFO] [stdout]     |
[INFO] [stdout] 163 | enum Coin {
[INFO] [stdout]     |      ---- variants in this enum
[INFO] [stdout] 164 |     Penny,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 165 |     Nickel,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 166 |     Dime,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Alabama` and `Alaska` are never constructed
[INFO] [stdout]    --> src/structs_enums/pattern_matching.rs:147:5
[INFO] [stdout]     |
[INFO] [stdout] 146 | enum UsState {
[INFO] [stdout]     |      ------- variants in this enum
[INFO] [stdout] 147 |     Alabama,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 148 |     Alaska,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Penny`, `Nickel`, and `Dime` are never constructed
[INFO] [stdout]    --> src/structs_enums/pattern_matching.rs:154:5
[INFO] [stdout]     |
[INFO] [stdout] 153 | enum Coin {
[INFO] [stdout]     |      ---- variants in this enum
[INFO] [stdout] 154 |     Penny,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 155 |     Nickel,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 156 |     Dime,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stdout]    --> src/structs_enums/pattern_matching.rs:186:5
[INFO] [stdout]     |
[INFO] [stdout] 185 | enum Message {
[INFO] [stdout]     |      ------- variants in this enum
[INFO] [stdout] 186 |     Quit,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 187 |     Move { x: i32, y: i32 },
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 188 |     Write(String),
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Shape` is never used
[INFO] [stdout]    --> src/structs_enums/pattern_matching.rs:192:6
[INFO] [stdout]     |
[INFO] [stdout] 192 | enum Shape {
[INFO] [stdout]     |      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ignore_patterns` is never used
[INFO] [stdout]    --> src/structs_enums/pattern_matching.rs:207:4
[INFO] [stdout]     |
[INFO] [stdout] 207 | fn ignore_patterns() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_references` is never used
[INFO] [stdout]    --> src/structs_enums/pattern_matching.rs:230:4
[INFO] [stdout]     |
[INFO] [stdout] 230 | fn match_references() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections/vectors.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |         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] 52 -         Int(i32),
[INFO] [stdout] 52 +         Int(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections/vectors.rs:53:15
[INFO] [stdout]    |
[INFO] [stdout] 53 |         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] 53 -         Float(f64),
[INFO] [stdout] 53 +         Float(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections/vectors.rs:54:14
[INFO] [stdout]    |
[INFO] [stdout] 54 |         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] 54 -         Text(String),
[INFO] [stdout] 54 +         Text(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string_operations` is never used
[INFO] [stdout]    --> src/collections/strings.rs:211:4
[INFO] [stdout]     |
[INFO] [stdout] 211 | fn string_operations() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `custom_hash_example` is never used
[INFO] [stdout]    --> src/collections/hashmaps.rs:212:4
[INFO] [stdout]     |
[INFO] [stdout] 212 | fn custom_hash_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `deliver_order` is never used
[INFO] [stdout]   --> src/modules_errors/modules.rs:45:4
[INFO] [stdout]    |
[INFO] [stdout] 45 | fn deliver_order() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function1` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:248:4
[INFO] [stdout]     |
[INFO] [stdout] 248 | fn function1() -> FmtResult {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function2` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:252:4
[INFO] [stdout]     |
[INFO] [stdout] 252 | fn function2() -> IoResult<()> {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `seat_at_table` is never used
[INFO] [stdout]   --> src/modules_errors/modules.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 |         fn seat_at_table() {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_order` is never used
[INFO] [stdout]   --> src/modules_errors/modules.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 |         fn take_order() {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `serve_order` is never used
[INFO] [stdout]   --> src/modules_errors/modules.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 |         fn serve_order() {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_payment` is never used
[INFO] [stdout]   --> src/modules_errors/modules.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 |         fn take_payment() {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `seasonal_fruit` is never read
[INFO] [stdout]   --> src/modules_errors/modules.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |     pub struct Breakfast {
[INFO] [stdout]    |                --------- field in this struct
[INFO] [stdout] 52 |         pub toast: String,      // 公共字段
[INFO] [stdout] 53 |         seasonal_fruit: String, // 私有字段
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fix_incorrect_order` is never used
[INFO] [stdout]   --> src/modules_errors/modules.rs:73:8
[INFO] [stdout]    |
[INFO] [stdout] 73 |     fn fix_incorrect_order() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `cook_order` is never used
[INFO] [stdout]   --> src/modules_errors/modules.rs:78:8
[INFO] [stdout]    |
[INFO] [stdout] 78 |     fn cook_order() {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_visibility` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:174:12
[INFO] [stdout]     |
[INFO] [stdout] 174 |     pub fn test_visibility() {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `call_public_function` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:166:16
[INFO] [stdout]     |
[INFO] [stdout] 166 |         pub fn call_public_function() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `public_function` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:152:20
[INFO] [stdout]     |
[INFO] [stdout] 152 |             pub fn public_function() {
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `private_function` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:156:16
[INFO] [stdout]     |
[INFO] [stdout] 156 |             fn private_function() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `indirect_access` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:160:20
[INFO] [stdout]     |
[INFO] [stdout] 160 |             pub fn indirect_access() {
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Area` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:194:15
[INFO] [stdout]     |
[INFO] [stdout] 194 |     pub trait Area {
[INFO] [stdout]     |               ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Circle` is never constructed
[INFO] [stdout]    --> src/modules_errors/modules.rs:199:16
[INFO] [stdout]     |
[INFO] [stdout] 199 |     pub struct Circle {
[INFO] [stdout]     |                ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:204:16
[INFO] [stdout]     |
[INFO] [stdout] 203 |     impl Circle {
[INFO] [stdout]     |     ----------- associated function in this implementation
[INFO] [stdout] 204 |         pub fn new(radius: f64) -> Circle {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]    --> src/modules_errors/modules.rs:216:12
[INFO] [stdout]     |
[INFO] [stdout] 216 |     struct Rectangle {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:222:12
[INFO] [stdout]     |
[INFO] [stdout] 221 |     impl Rectangle {
[INFO] [stdout]     |     -------------- associated function in this implementation
[INFO] [stdout] 222 |         fn new(width: f64, height: f64) -> Rectangle {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `create_circle` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:234:12
[INFO] [stdout]     |
[INFO] [stdout] 234 |     pub fn create_circle(radius: f64) -> impl Area {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `validate_positive` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:239:8
[INFO] [stdout]     |
[INFO] [stdout] 239 |     fn validate_positive(value: f64) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:267:12
[INFO] [stdout]     |
[INFO] [stdout] 267 |     pub fn add(a: i32, b: i32) -> i32 {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `multiply` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:272:12
[INFO] [stdout]     |
[INFO] [stdout] 272 |     pub fn multiply(a: i32, b: i32) -> i32 {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `internal_helper` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:277:8
[INFO] [stdout]     |
[INFO] [stdout] 277 |     fn internal_helper() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file_short` is never used
[INFO] [stdout]    --> src/modules_errors/error_handling.rs:134:4
[INFO] [stdout]     |
[INFO] [stdout] 134 | fn read_username_from_file_short() -> Result<String, io::Error> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `process_data` is never used
[INFO] [stdout]    --> src/modules_errors/error_handling.rs:202:4
[INFO] [stdout]     |
[INFO] [stdout] 202 | fn process_data(data: &str) -> Result<i32, Box<dyn std::error::Error>> {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_first_even` is never used
[INFO] [stdout]    --> src/modules_errors/error_handling.rs:218:4
[INFO] [stdout]     |
[INFO] [stdout] 218 | fn find_first_even(numbers: &[i32]) -> Option<i32> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_and_find_even` is never used
[INFO] [stdout]    --> src/modules_errors/error_handling.rs:222:4
[INFO] [stdout]     |
[INFO] [stdout] 222 | fn parse_and_find_even(strings: &[&str]) -> Result<Option<i32>, ParseIntError> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `divide` is never used
[INFO] [stdout]    --> src/modules_errors/error_handling.rs:230:4
[INFO] [stdout]     |
[INFO] [stdout] 230 | fn divide(a: f64, b: f64) -> Result<f64, String> {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `safe_divide` is never used
[INFO] [stdout]    --> src/modules_errors/error_handling.rs:238:4
[INFO] [stdout]     |
[INFO] [stdout] 238 | fn safe_divide(a: f64, b: f64) -> f64 {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `setup_panic_hook` is never used
[INFO] [stdout]    --> src/modules_errors/error_handling.rs:246:4
[INFO] [stdout]     |
[INFO] [stdout] 246 | fn setup_panic_hook() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]    --> src/advanced/generics.rs:108:5
[INFO] [stdout]     |
[INFO] [stdout] 107 | struct Point2<T, U> {
[INFO] [stdout]     |        ------ fields in this struct
[INFO] [stdout] 108 |     x: T,
[INFO] [stdout]     |     ^
[INFO] [stdout] 109 |     y: U,
[INFO] [stdout]     |     ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Point2` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NewsArticle` is never constructed
[INFO] [stdout]    --> src/advanced/generics.rs:131:12
[INFO] [stdout]     |
[INFO] [stdout] 131 | pub struct NewsArticle {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]    --> src/advanced/generics.rs:147:9
[INFO] [stdout]     |
[INFO] [stdout] 144 | pub struct Tweet {
[INFO] [stdout]     |            ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 147 |     pub reply: bool,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 148 |     pub retweet: bool,
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify` is never used
[INFO] [stdout]    --> src/advanced/generics.rs:163:4
[INFO] [stdout]     |
[INFO] [stdout] 163 | fn notify<T: Summary + std::fmt::Display>(item: &T) {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `data` is never read
[INFO] [stdout]    --> src/advanced/generics.rs:222:5
[INFO] [stdout]     |
[INFO] [stdout] 221 | struct Buffer<const SIZE: usize> {
[INFO] [stdout]     |        ------ field in this struct
[INFO] [stdout] 222 |     data: [u8; SIZE],
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `min`, `max`, `mean`, and `median` are never read
[INFO] [stdout]    --> src/advanced/generics.rs:240:5
[INFO] [stdout]     |
[INFO] [stdout] 239 | struct Statistics {
[INFO] [stdout]     |        ---------- fields in this struct
[INFO] [stdout] 240 |     min: f64,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 241 |     max: f64,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 242 |     mean: f64,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 243 |     median: f64,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Statistics` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `RequestBuilder` is never constructed
[INFO] [stdout]    --> src/advanced/generics.rs:283:8
[INFO] [stdout]     |
[INFO] [stdout] 283 | struct RequestBuilder<State> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NoBody` is never constructed
[INFO] [stdout]    --> src/advanced/generics.rs:289:8
[INFO] [stdout]     |
[INFO] [stdout] 289 | struct NoBody;
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `WithBody` is never constructed
[INFO] [stdout]    --> src/advanced/generics.rs:290:8
[INFO] [stdout]     |
[INFO] [stdout] 290 | struct WithBody {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `with_body` are never used
[INFO] [stdout]    --> src/advanced/generics.rs:295:8
[INFO] [stdout]     |
[INFO] [stdout] 294 | impl RequestBuilder<NoBody> {
[INFO] [stdout]     | --------------------------- associated items in this implementation
[INFO] [stdout] 295 |     fn new(url: String) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 303 |     fn with_body(self, body: String) -> RequestBuilder<WithBody> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `send` is never used
[INFO] [stdout]    --> src/advanced/generics.rs:313:8
[INFO] [stdout]     |
[INFO] [stdout] 312 | impl RequestBuilder<WithBody> {
[INFO] [stdout]     | ----------------------------- method in this implementation
[INFO] [stdout] 313 |     fn send(self) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `use_request_builder` is never used
[INFO] [stdout]    --> src/advanced/generics.rs:319:4
[INFO] [stdout]     |
[INFO] [stdout] 319 | fn use_request_builder() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `return_summarizable` is never used
[INFO] [stdout]    --> src/advanced/generics.rs:326:4
[INFO] [stdout]     |
[INFO] [stdout] 326 | fn return_summarizable() -> impl Summary {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Add` is never used
[INFO] [stdout]    --> src/advanced/generics.rs:336:7
[INFO] [stdout]     |
[INFO] [stdout] 336 | trait Add<RHS = Self> {
[INFO] [stdout]     |       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Meters` is never constructed
[INFO] [stdout]    --> src/advanced/generics.rs:342:8
[INFO] [stdout]     |
[INFO] [stdout] 342 | struct Meters(f64);
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NewsArticle` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:121:12
[INFO] [stdout]     |
[INFO] [stdout] 121 | pub struct NewsArticle {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]    --> src/advanced/traits.rs:137:9
[INFO] [stdout]     |
[INFO] [stdout] 134 | pub struct Tweet {
[INFO] [stdout]     |            ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 137 |     pub reply: bool,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 138 |     pub retweet: bool,
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `OutlinePrint` is never used
[INFO] [stdout]    --> src/advanced/traits.rs:339:7
[INFO] [stdout]     |
[INFO] [stdout] 339 | trait OutlinePrint: fmt::Display {
[INFO] [stdout]     |       ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Coordinates` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:375:8
[INFO] [stdout]     |
[INFO] [stdout] 375 | struct Coordinates {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:382:8
[INFO] [stdout]     |
[INFO] [stdout] 382 | struct Color {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Priority` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:390:8
[INFO] [stdout]     |
[INFO] [stdout] 390 | struct Priority(u8);
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `UserId` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:394:8
[INFO] [stdout]     |
[INFO] [stdout] 394 | struct UserId(u64);
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Config` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:398:8
[INFO] [stdout]     |
[INFO] [stdout] 398 | struct Config {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Inches` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:404:8
[INFO] [stdout]     |
[INFO] [stdout] 404 | struct Inches(i32);
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Centimeters` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:405:8
[INFO] [stdout]     |
[INFO] [stdout] 405 | struct Centimeters(i32);
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PositiveNumber` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:414:8
[INFO] [stdout]     |
[INFO] [stdout] 414 | struct PositiveNumber(i32);
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MyBox` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:431:8
[INFO] [stdout]     |
[INFO] [stdout] 431 | struct MyBox<T>(T);
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Resource` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:448:8
[INFO] [stdout]     |
[INFO] [stdout] 448 | struct Resource {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Countdown` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:459:8
[INFO] [stdout]     |
[INFO] [stdout] 459 | struct Countdown {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `level` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:105:8
[INFO] [stdout]     |
[INFO] [stdout] 103 | impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]     | ----------------------------- method in this implementation
[INFO] [stdout] 104 |     // 规则3应用：返回值的生命周期与 self 相同
[INFO] [stdout] 105 |     fn level(&self) -> i32 {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_value` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:152:8
[INFO] [stdout]     |
[INFO] [stdout] 151 | impl<'a, T> Wrapper<'a, T> {
[INFO] [stdout]     | -------------------------- method in this implementation
[INFO] [stdout] 152 |     fn get_value(&self) -> &'a T {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Context` is never constructed
[INFO] [stdout]    --> src/advanced/lifetimes.rs:177:8
[INFO] [stdout]     |
[INFO] [stdout] 177 | struct Context<'a>(&'a str);
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Parser` is never constructed
[INFO] [stdout]    --> src/advanced/lifetimes.rs:179:8
[INFO] [stdout]     |
[INFO] [stdout] 179 | struct Parser<'a, 'c: 'a> {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `parse` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:184:8
[INFO] [stdout]     |
[INFO] [stdout] 183 | impl<'a, 'c: 'a> Parser<'a, 'c> {
[INFO] [stdout]     | ------------------------------- method in this implementation
[INFO] [stdout] 184 |     fn parse(&self) -> Result<(), &'c str> {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_context` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:189:4
[INFO] [stdout]     |
[INFO] [stdout] 189 | fn parse_context(context: Context) -> Result<(), &str> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `make_adder` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:194:4
[INFO] [stdout]     |
[INFO] [stdout] 194 | fn make_adder<'a>(x: &'a i32) -> Box<dyn Fn(i32) -> i32 + 'a> {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Iter` is never constructed
[INFO] [stdout]    --> src/advanced/lifetimes.rs:199:8
[INFO] [stdout]     |
[INFO] [stdout] 199 | struct Iter<'a, T> {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Process` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:219:7
[INFO] [stdout]     |
[INFO] [stdout] 219 | trait Process {
[INFO] [stdout]     |       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TextProcessor` is never constructed
[INFO] [stdout]    --> src/advanced/lifetimes.rs:225:8
[INFO] [stdout]     |
[INFO] [stdout] 225 | struct TextProcessor {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `raw_pointers_example` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:238:11
[INFO] [stdout]     |
[INFO] [stdout] 238 | unsafe fn raw_pointers_example() {
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Marker` is never constructed
[INFO] [stdout]    --> src/advanced/lifetimes.rs:251:8
[INFO] [stdout]     |
[INFO] [stdout] 251 | struct Marker<'a, T> {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:256:8
[INFO] [stdout]     |
[INFO] [stdout] 255 | impl<'a, T> Marker<'a, T> {
[INFO] [stdout]     | ------------------------- associated function in this implementation
[INFO] [stdout] 256 |     fn new() -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `spawn_thread` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:266:4
[INFO] [stdout]     |
[INFO] [stdout] 266 | fn spawn_thread() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lifetime_diagnostics` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:281:4
[INFO] [stdout]     |
[INFO] [stdout] 281 | fn lifetime_diagnostics() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `pattern_matching_lifetime` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:296:4
[INFO] [stdout]     |
[INFO] [stdout] 296 | fn pattern_matching_lifetime<'a>(s: &'a str) -> &'a str {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&str` instead of cloning the inner type
[INFO] [stdout]    --> src/collections/hashmaps.rs:186:25
[INFO] [stdout]     |
[INFO] [stdout] 186 |         .map(|(k, v)| (k.clone(), v * 2))
[INFO] [stdout]     |                         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/advanced/lifetimes.rs:189:27
[INFO] [stdout]     |
[INFO] [stdout] 189 | fn parse_context(context: Context) -> Result<(), &str> {
[INFO] [stdout]     |                           ^^^^^^^                ^^^^ the same lifetime is elided here
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           the lifetime is hidden here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 189 | fn parse_context(context: Context<'_>) -> Result<(), &str> {
[INFO] [stdout]     |                                  ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ownership/references_borrowing.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut s = String::from("hello");
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/ownership/references_borrowing.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut s = String::from("hello");
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `origin`
[INFO] [stdout]   --> src/structs_enums/structs.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let origin = Point(0, 0, 0);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_origin`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `subject`
[INFO] [stdout]   --> src/structs_enums/structs.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let subject = AlwaysEqual;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_subject`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `msg3`
[INFO] [stdout]   --> src/structs_enums/enums.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let msg3 = Message::Write(String::from("hello"));
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_msg3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `msg4`
[INFO] [stdout]   --> src/structs_enums/enums.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let msg4 = Message::ChangeColor(255, 0, 0);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_msg4`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `error`
[INFO] [stdout]   --> src/structs_enums/enums.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let error: Result<i32, String> = Err(String::from("出错了"));
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/structs_enums/pattern_matching.rs:226:9
[INFO] [stdout]     |
[INFO] [stdout] 226 |     let y = 10; // 会产生警告
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling ppv-lite86 v0.2.21
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/collections/vectors.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     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/strings.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let s = 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: `order1`
[INFO] [stdout]    --> src/modules_errors/modules.rs:116:9
[INFO] [stdout]     |
[INFO] [stdout] 116 |     let order1 = back_of_house::Appetizer::Soup;
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order2`
[INFO] [stdout]    --> src/modules_errors/modules.rs:117:9
[INFO] [stdout]     |
[INFO] [stdout] 117 |     let order2 = back_of_house::Appetizer::Salad;
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `body`
[INFO] [stdout]    --> src/advanced/generics.rs:303:24
[INFO] [stdout]     |
[INFO] [stdout] 303 |     fn with_body(self, body: String) -> RequestBuilder<WithBody> {
[INFO] [stdout]     |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_body`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]    --> src/advanced/lifetimes.rs:240:9
[INFO] [stdout]     |
[INFO] [stdout] 240 |     let r1 = &num as *const i32;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling libz-sys v1.1.25
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]    --> src/advanced/lifetimes.rs:241:9
[INFO] [stdout]     |
[INFO] [stdout] 241 |     let r2 = &mut num as *mut i32;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `absolute_value` is never used
[INFO] [stdout]   --> src/basics/functions.rs:71:4
[INFO] [stdout]    |
[INFO] [stdout] 71 | fn absolute_value(x: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `factorial` is never used
[INFO] [stdout]   --> src/basics/functions.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn factorial(n: u64) -> u64 {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `closure_example` is never used
[INFO] [stdout]   --> src/basics/functions.rs:89:4
[INFO] [stdout]    |
[INFO] [stdout] 89 | fn closure_example() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_length` is never used
[INFO] [stdout]   --> src/ownership/ownership_basics.rs:74:4
[INFO] [stdout]    |
[INFO] [stdout] 74 | fn calculate_length(s: String) -> (String, usize) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_length_with_ref` is never used
[INFO] [stdout]   --> src/ownership/ownership_basics.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn calculate_length_with_ref(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `split_at_space` is never used
[INFO] [stdout]    --> src/ownership/references_borrowing.rs:125:4
[INFO] [stdout]     |
[INFO] [stdout] 125 | fn split_at_space(s: &str) -> (&str, &str) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/structs_enums/structs.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     struct DebugPoint {
[INFO] [stdout]    |            ---------- fields in this struct
[INFO] [stdout] 67 |         x: i32,
[INFO] [stdout]    |         ^
[INFO] [stdout] 68 |         y: i32,
[INFO] [stdout]    |         ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `DebugPoint` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `email` is never read
[INFO] [stdout]   --> src/structs_enums/structs.rs:86:5
[INFO] [stdout]    |
[INFO] [stdout] 84 | struct User {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 85 |     username: String,
[INFO] [stdout] 86 |     email: String,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, and `2` are never read
[INFO] [stdout]   --> src/structs_enums/structs.rs:93:14
[INFO] [stdout]    |
[INFO] [stdout] 93 | struct Point(i32, i32, i32);
[INFO] [stdout]    |        ----- ^^^  ^^^  ^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        fields in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing these fields
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `perimeter` is never used
[INFO] [stdout]    --> src/structs_enums/structs.rs:126:8
[INFO] [stdout]     |
[INFO] [stdout] 125 | impl Rectangle {
[INFO] [stdout]     | -------------- method in this implementation
[INFO] [stdout] 126 |     fn perimeter(&self) -> u32 {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ImportantExcerpt` is never constructed
[INFO] [stdout]    --> src/structs_enums/structs.rs:149:8
[INFO] [stdout]     |
[INFO] [stdout] 149 | struct ImportantExcerpt<'a> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/structs_enums/enums.rs:93:8
[INFO] [stdout]    |
[INFO] [stdout] 93 |     V4(String),
[INFO] [stdout]    |     -- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[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] 93 -     V4(String),
[INFO] [stdout] 93 +     V4(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/structs_enums/enums.rs:94:8
[INFO] [stdout]    |
[INFO] [stdout] 94 |     V6(String),
[INFO] [stdout]    |     -- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[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] 94 -     V6(String),
[INFO] [stdout] 94 +     V6(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/structs_enums/enums.rs:125:12
[INFO] [stdout]     |
[INFO] [stdout] 125 |     Circle(Point, f64), // 圆心和半径
[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] 125 -     Circle(Point, f64), // 圆心和半径
[INFO] [stdout] 125 +     Circle((), f64), // 圆心和半径
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Rectangle` and `Triangle` are never constructed
[INFO] [stdout]    --> src/structs_enums/enums.rs:126:5
[INFO] [stdout]     |
[INFO] [stdout] 124 | enum Shape {
[INFO] [stdout]     |      ----- variants in this enum
[INFO] [stdout] 125 |     Circle(Point, f64), // 圆心和半径
[INFO] [stdout] 126 |     Rectangle(Point, Point), // 两个对角点
[INFO] [stdout]     |     ^^^^^^^^^
[INFO] [stdout] 127 |     Triangle(Point, Point, Point), // 三个顶点
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Alaska` is never constructed
[INFO] [stdout]    --> src/structs_enums/enums.rs:159:5
[INFO] [stdout]     |
[INFO] [stdout] 157 | enum UsState {
[INFO] [stdout]     |      ------- variant in this enum
[INFO] [stdout] 158 |     Alabama,
[INFO] [stdout] 159 |     Alaska,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Penny`, `Nickel`, and `Dime` are never constructed
[INFO] [stdout]    --> src/structs_enums/enums.rs:164:5
[INFO] [stdout]     |
[INFO] [stdout] 163 | enum Coin {
[INFO] [stdout]     |      ---- variants in this enum
[INFO] [stdout] 164 |     Penny,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 165 |     Nickel,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 166 |     Dime,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Alabama` and `Alaska` are never constructed
[INFO] [stdout]    --> src/structs_enums/pattern_matching.rs:147:5
[INFO] [stdout]     |
[INFO] [stdout] 146 | enum UsState {
[INFO] [stdout]     |      ------- variants in this enum
[INFO] [stdout] 147 |     Alabama,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 148 |     Alaska,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Penny`, `Nickel`, and `Dime` are never constructed
[INFO] [stdout]    --> src/structs_enums/pattern_matching.rs:154:5
[INFO] [stdout]     |
[INFO] [stdout] 153 | enum Coin {
[INFO] [stdout]     |      ---- variants in this enum
[INFO] [stdout] 154 |     Penny,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 155 |     Nickel,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 156 |     Dime,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stdout]    --> src/structs_enums/pattern_matching.rs:186:5
[INFO] [stdout]     |
[INFO] [stdout] 185 | enum Message {
[INFO] [stdout]     |      ------- variants in this enum
[INFO] [stdout] 186 |     Quit,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 187 |     Move { x: i32, y: i32 },
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 188 |     Write(String),
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Shape` is never used
[INFO] [stdout]    --> src/structs_enums/pattern_matching.rs:192:6
[INFO] [stdout]     |
[INFO] [stdout] 192 | enum Shape {
[INFO] [stdout]     |      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ignore_patterns` is never used
[INFO] [stdout]    --> src/structs_enums/pattern_matching.rs:207:4
[INFO] [stdout]     |
[INFO] [stdout] 207 | fn ignore_patterns() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_references` is never used
[INFO] [stdout]    --> src/structs_enums/pattern_matching.rs:230:4
[INFO] [stdout]     |
[INFO] [stdout] 230 | fn match_references() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections/vectors.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |         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] 52 -         Int(i32),
[INFO] [stdout] 52 +         Int(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections/vectors.rs:53:15
[INFO] [stdout]    |
[INFO] [stdout] 53 |         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] 53 -         Float(f64),
[INFO] [stdout] 53 +         Float(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/collections/vectors.rs:54:14
[INFO] [stdout]    |
[INFO] [stdout] 54 |         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] 54 -         Text(String),
[INFO] [stdout] 54 +         Text(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string_operations` is never used
[INFO] [stdout]    --> src/collections/strings.rs:211:4
[INFO] [stdout]     |
[INFO] [stdout] 211 | fn string_operations() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `custom_hash_example` is never used
[INFO] [stdout]    --> src/collections/hashmaps.rs:212:4
[INFO] [stdout]     |
[INFO] [stdout] 212 | fn custom_hash_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `deliver_order` is never used
[INFO] [stdout]   --> src/modules_errors/modules.rs:45:4
[INFO] [stdout]    |
[INFO] [stdout] 45 | fn deliver_order() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function1` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:248:4
[INFO] [stdout]     |
[INFO] [stdout] 248 | fn function1() -> FmtResult {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function2` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:252:4
[INFO] [stdout]     |
[INFO] [stdout] 252 | fn function2() -> IoResult<()> {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `seat_at_table` is never used
[INFO] [stdout]   --> src/modules_errors/modules.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 |         fn seat_at_table() {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_order` is never used
[INFO] [stdout]   --> src/modules_errors/modules.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 |         fn take_order() {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `serve_order` is never used
[INFO] [stdout]   --> src/modules_errors/modules.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 |         fn serve_order() {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_payment` is never used
[INFO] [stdout]   --> src/modules_errors/modules.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 |         fn take_payment() {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `seasonal_fruit` is never read
[INFO] [stdout]   --> src/modules_errors/modules.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |     pub struct Breakfast {
[INFO] [stdout]    |                --------- field in this struct
[INFO] [stdout] 52 |         pub toast: String,      // 公共字段
[INFO] [stdout] 53 |         seasonal_fruit: String, // 私有字段
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fix_incorrect_order` is never used
[INFO] [stdout]   --> src/modules_errors/modules.rs:73:8
[INFO] [stdout]    |
[INFO] [stdout] 73 |     fn fix_incorrect_order() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `cook_order` is never used
[INFO] [stdout]   --> src/modules_errors/modules.rs:78:8
[INFO] [stdout]    |
[INFO] [stdout] 78 |     fn cook_order() {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_visibility` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:174:12
[INFO] [stdout]     |
[INFO] [stdout] 174 |     pub fn test_visibility() {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `call_public_function` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:166:16
[INFO] [stdout]     |
[INFO] [stdout] 166 |         pub fn call_public_function() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `public_function` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:152:20
[INFO] [stdout]     |
[INFO] [stdout] 152 |             pub fn public_function() {
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `private_function` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:156:16
[INFO] [stdout]     |
[INFO] [stdout] 156 |             fn private_function() {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `indirect_access` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:160:20
[INFO] [stdout]     |
[INFO] [stdout] 160 |             pub fn indirect_access() {
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Area` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:194:15
[INFO] [stdout]     |
[INFO] [stdout] 194 |     pub trait Area {
[INFO] [stdout]     |               ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Circle` is never constructed
[INFO] [stdout]    --> src/modules_errors/modules.rs:199:16
[INFO] [stdout]     |
[INFO] [stdout] 199 |     pub struct Circle {
[INFO] [stdout]     |                ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:204:16
[INFO] [stdout]     |
[INFO] [stdout] 203 |     impl Circle {
[INFO] [stdout]     |     ----------- associated function in this implementation
[INFO] [stdout] 204 |         pub fn new(radius: f64) -> Circle {
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]    --> src/modules_errors/modules.rs:216:12
[INFO] [stdout]     |
[INFO] [stdout] 216 |     struct Rectangle {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:222:12
[INFO] [stdout]     |
[INFO] [stdout] 221 |     impl Rectangle {
[INFO] [stdout]     |     -------------- associated function in this implementation
[INFO] [stdout] 222 |         fn new(width: f64, height: f64) -> Rectangle {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `create_circle` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:234:12
[INFO] [stdout]     |
[INFO] [stdout] 234 |     pub fn create_circle(radius: f64) -> impl Area {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `validate_positive` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:239:8
[INFO] [stdout]     |
[INFO] [stdout] 239 |     fn validate_positive(value: f64) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:267:12
[INFO] [stdout]     |
[INFO] [stdout] 267 |     pub fn add(a: i32, b: i32) -> i32 {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `multiply` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:272:12
[INFO] [stdout]     |
[INFO] [stdout] 272 |     pub fn multiply(a: i32, b: i32) -> i32 {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `internal_helper` is never used
[INFO] [stdout]    --> src/modules_errors/modules.rs:277:8
[INFO] [stdout]     |
[INFO] [stdout] 277 |     fn internal_helper() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file_short` is never used
[INFO] [stdout]    --> src/modules_errors/error_handling.rs:134:4
[INFO] [stdout]     |
[INFO] [stdout] 134 | fn read_username_from_file_short() -> Result<String, io::Error> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `process_data` is never used
[INFO] [stdout]    --> src/modules_errors/error_handling.rs:202:4
[INFO] [stdout]     |
[INFO] [stdout] 202 | fn process_data(data: &str) -> Result<i32, Box<dyn std::error::Error>> {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_first_even` is never used
[INFO] [stdout]    --> src/modules_errors/error_handling.rs:218:4
[INFO] [stdout]     |
[INFO] [stdout] 218 | fn find_first_even(numbers: &[i32]) -> Option<i32> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_and_find_even` is never used
[INFO] [stdout]    --> src/modules_errors/error_handling.rs:222:4
[INFO] [stdout]     |
[INFO] [stdout] 222 | fn parse_and_find_even(strings: &[&str]) -> Result<Option<i32>, ParseIntError> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `divide` is never used
[INFO] [stdout]    --> src/modules_errors/error_handling.rs:230:4
[INFO] [stdout]     |
[INFO] [stdout] 230 | fn divide(a: f64, b: f64) -> Result<f64, String> {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `safe_divide` is never used
[INFO] [stdout]    --> src/modules_errors/error_handling.rs:238:4
[INFO] [stdout]     |
[INFO] [stdout] 238 | fn safe_divide(a: f64, b: f64) -> f64 {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `setup_panic_hook` is never used
[INFO] [stdout]    --> src/modules_errors/error_handling.rs:246:4
[INFO] [stdout]     |
[INFO] [stdout] 246 | fn setup_panic_hook() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]    --> src/advanced/generics.rs:108:5
[INFO] [stdout]     |
[INFO] [stdout] 107 | struct Point2<T, U> {
[INFO] [stdout]     |        ------ fields in this struct
[INFO] [stdout] 108 |     x: T,
[INFO] [stdout]     |     ^
[INFO] [stdout] 109 |     y: U,
[INFO] [stdout]     |     ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Point2` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NewsArticle` is never constructed
[INFO] [stdout]    --> src/advanced/generics.rs:131:12
[INFO] [stdout]     |
[INFO] [stdout] 131 | pub struct NewsArticle {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]    --> src/advanced/generics.rs:147:9
[INFO] [stdout]     |
[INFO] [stdout] 144 | pub struct Tweet {
[INFO] [stdout]     |            ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 147 |     pub reply: bool,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 148 |     pub retweet: bool,
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify` is never used
[INFO] [stdout]    --> src/advanced/generics.rs:163:4
[INFO] [stdout]     |
[INFO] [stdout] 163 | fn notify<T: Summary + std::fmt::Display>(item: &T) {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `data` is never read
[INFO] [stdout]    --> src/advanced/generics.rs:222:5
[INFO] [stdout]     |
[INFO] [stdout] 221 | struct Buffer<const SIZE: usize> {
[INFO] [stdout]     |        ------ field in this struct
[INFO] [stdout] 222 |     data: [u8; SIZE],
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `min`, `max`, `mean`, and `median` are never read
[INFO] [stdout]    --> src/advanced/generics.rs:240:5
[INFO] [stdout]     |
[INFO] [stdout] 239 | struct Statistics {
[INFO] [stdout]     |        ---------- fields in this struct
[INFO] [stdout] 240 |     min: f64,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 241 |     max: f64,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 242 |     mean: f64,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 243 |     median: f64,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Statistics` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `RequestBuilder` is never constructed
[INFO] [stdout]    --> src/advanced/generics.rs:283:8
[INFO] [stdout]     |
[INFO] [stdout] 283 | struct RequestBuilder<State> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NoBody` is never constructed
[INFO] [stdout]    --> src/advanced/generics.rs:289:8
[INFO] [stdout]     |
[INFO] [stdout] 289 | struct NoBody;
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `WithBody` is never constructed
[INFO] [stdout]    --> src/advanced/generics.rs:290:8
[INFO] [stdout]     |
[INFO] [stdout] 290 | struct WithBody {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `with_body` are never used
[INFO] [stdout]    --> src/advanced/generics.rs:295:8
[INFO] [stdout]     |
[INFO] [stdout] 294 | impl RequestBuilder<NoBody> {
[INFO] [stdout]     | --------------------------- associated items in this implementation
[INFO] [stdout] 295 |     fn new(url: String) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 303 |     fn with_body(self, body: String) -> RequestBuilder<WithBody> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `send` is never used
[INFO] [stdout]    --> src/advanced/generics.rs:313:8
[INFO] [stdout]     |
[INFO] [stdout] 312 | impl RequestBuilder<WithBody> {
[INFO] [stdout]     | ----------------------------- method in this implementation
[INFO] [stdout] 313 |     fn send(self) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `use_request_builder` is never used
[INFO] [stdout]    --> src/advanced/generics.rs:319:4
[INFO] [stdout]     |
[INFO] [stdout] 319 | fn use_request_builder() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `return_summarizable` is never used
[INFO] [stdout]    --> src/advanced/generics.rs:326:4
[INFO] [stdout]     |
[INFO] [stdout] 326 | fn return_summarizable() -> impl Summary {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Add` is never used
[INFO] [stdout]    --> src/advanced/generics.rs:336:7
[INFO] [stdout]     |
[INFO] [stdout] 336 | trait Add<RHS = Self> {
[INFO] [stdout]     |       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Meters` is never constructed
[INFO] [stdout]    --> src/advanced/generics.rs:342:8
[INFO] [stdout]     |
[INFO] [stdout] 342 | struct Meters(f64);
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NewsArticle` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:121:12
[INFO] [stdout]     |
[INFO] [stdout] 121 | pub struct NewsArticle {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]    --> src/advanced/traits.rs:137:9
[INFO] [stdout]     |
[INFO] [stdout] 134 | pub struct Tweet {
[INFO] [stdout]     |            ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 137 |     pub reply: bool,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 138 |     pub retweet: bool,
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `OutlinePrint` is never used
[INFO] [stdout]    --> src/advanced/traits.rs:339:7
[INFO] [stdout]     |
[INFO] [stdout] 339 | trait OutlinePrint: fmt::Display {
[INFO] [stdout]     |       ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Coordinates` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:375:8
[INFO] [stdout]     |
[INFO] [stdout] 375 | struct Coordinates {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:382:8
[INFO] [stdout]     |
[INFO] [stdout] 382 | struct Color {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Priority` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:390:8
[INFO] [stdout]     |
[INFO] [stdout] 390 | struct Priority(u8);
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `UserId` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:394:8
[INFO] [stdout]     |
[INFO] [stdout] 394 | struct UserId(u64);
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Config` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:398:8
[INFO] [stdout]     |
[INFO] [stdout] 398 | struct Config {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Inches` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:404:8
[INFO] [stdout]     |
[INFO] [stdout] 404 | struct Inches(i32);
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Centimeters` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:405:8
[INFO] [stdout]     |
[INFO] [stdout] 405 | struct Centimeters(i32);
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PositiveNumber` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:414:8
[INFO] [stdout]     |
[INFO] [stdout] 414 | struct PositiveNumber(i32);
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MyBox` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:431:8
[INFO] [stdout]     |
[INFO] [stdout] 431 | struct MyBox<T>(T);
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Resource` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:448:8
[INFO] [stdout]     |
[INFO] [stdout] 448 | struct Resource {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Countdown` is never constructed
[INFO] [stdout]    --> src/advanced/traits.rs:459:8
[INFO] [stdout]     |
[INFO] [stdout] 459 | struct Countdown {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `level` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:105:8
[INFO] [stdout]     |
[INFO] [stdout] 103 | impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]     | ----------------------------- method in this implementation
[INFO] [stdout] 104 |     // 规则3应用：返回值的生命周期与 self 相同
[INFO] [stdout] 105 |     fn level(&self) -> i32 {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_value` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:152:8
[INFO] [stdout]     |
[INFO] [stdout] 151 | impl<'a, T> Wrapper<'a, T> {
[INFO] [stdout]     | -------------------------- method in this implementation
[INFO] [stdout] 152 |     fn get_value(&self) -> &'a T {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Context` is never constructed
[INFO] [stdout]    --> src/advanced/lifetimes.rs:177:8
[INFO] [stdout]     |
[INFO] [stdout] 177 | struct Context<'a>(&'a str);
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Parser` is never constructed
[INFO] [stdout]    --> src/advanced/lifetimes.rs:179:8
[INFO] [stdout]     |
[INFO] [stdout] 179 | struct Parser<'a, 'c: 'a> {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `parse` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:184:8
[INFO] [stdout]     |
[INFO] [stdout] 183 | impl<'a, 'c: 'a> Parser<'a, 'c> {
[INFO] [stdout]     | ------------------------------- method in this implementation
[INFO] [stdout] 184 |     fn parse(&self) -> Result<(), &'c str> {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_context` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:189:4
[INFO] [stdout]     |
[INFO] [stdout] 189 | fn parse_context(context: Context) -> Result<(), &str> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `make_adder` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:194:4
[INFO] [stdout]     |
[INFO] [stdout] 194 | fn make_adder<'a>(x: &'a i32) -> Box<dyn Fn(i32) -> i32 + 'a> {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Iter` is never constructed
[INFO] [stdout]    --> src/advanced/lifetimes.rs:199:8
[INFO] [stdout]     |
[INFO] [stdout] 199 | struct Iter<'a, T> {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Process` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:219:7
[INFO] [stdout]     |
[INFO] [stdout] 219 | trait Process {
[INFO] [stdout]     |       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TextProcessor` is never constructed
[INFO] [stdout]    --> src/advanced/lifetimes.rs:225:8
[INFO] [stdout]     |
[INFO] [stdout] 225 | struct TextProcessor {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `raw_pointers_example` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:238:11
[INFO] [stdout]     |
[INFO] [stdout] 238 | unsafe fn raw_pointers_example() {
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Marker` is never constructed
[INFO] [stdout]    --> src/advanced/lifetimes.rs:251:8
[INFO] [stdout]     |
[INFO] [stdout] 251 | struct Marker<'a, T> {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:256:8
[INFO] [stdout]     |
[INFO] [stdout] 255 | impl<'a, T> Marker<'a, T> {
[INFO] [stdout]     | ------------------------- associated function in this implementation
[INFO] [stdout] 256 |     fn new() -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `spawn_thread` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:266:4
[INFO] [stdout]     |
[INFO] [stdout] 266 | fn spawn_thread() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lifetime_diagnostics` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:281:4
[INFO] [stdout]     |
[INFO] [stdout] 281 | fn lifetime_diagnostics() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `pattern_matching_lifetime` is never used
[INFO] [stdout]    --> src/advanced/lifetimes.rs:296:4
[INFO] [stdout]     |
[INFO] [stdout] 296 | fn pattern_matching_lifetime<'a>(s: &'a str) -> &'a str {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&str` instead of cloning the inner type
[INFO] [stdout]    --> src/collections/hashmaps.rs:186:25
[INFO] [stdout]     |
[INFO] [stdout] 186 |         .map(|(k, v)| (k.clone(), v * 2))
[INFO] [stdout]     |                         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/advanced/lifetimes.rs:189:27
[INFO] [stdout]     |
[INFO] [stdout] 189 | fn parse_context(context: Context) -> Result<(), &str> {
[INFO] [stdout]     |                           ^^^^^^^                ^^^^ the same lifetime is elided here
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           the lifetime is hidden here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 189 | fn parse_context(context: Context<'_>) -> Result<(), &str> {
[INFO] [stdout]     |                                  ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking config v0.14.1
[INFO] [stderr]    Compiling proc-macro-crate v3.5.0
[INFO] [stderr]     Checking tokio-stream v0.1.18
[INFO] [stderr]     Checking tokio-util v0.7.18
[INFO] [stderr]     Checking tokio-retry v0.3.0
[INFO] [stderr]     Checking hyper v1.8.1
[INFO] [stderr]     Checking tower v0.5.3
[INFO] [stderr]    Compiling num_enum_derive v0.7.6
[INFO] [stderr]     Checking sqlx-core v0.8.6
[INFO] [stderr]     Checking combine v4.6.7
[INFO] [stderr]     Checking hyper-util v0.1.20
[INFO] [stderr]     Checking num_enum v0.7.6
[INFO] [stderr]     Checking axum v0.8.8
[INFO] [stderr]    Compiling sqlx-mysql v0.8.6
[INFO] [stderr]    Compiling sqlx-macros-core v0.8.6
[INFO] [stderr]     Checking redis v0.26.1
[INFO] [stderr]    Compiling sqlx-macros v0.8.6
[INFO] [stderr]     Checking sqlx v0.8.6
[INFO] [stderr]     Checking shared v0.1.0 (/opt/rustwide/workdir/demos/shared)
[INFO] [stderr]     Checking http-api v0.1.0 (/opt/rustwide/workdir/demos/http-api)
[INFO] [stderr]     Checking mysql-crud v0.1.0 (/opt/rustwide/workdir/demos/mysql-crud)
[INFO] [stderr]     Checking concurrent-tasks v0.1.0 (/opt/rustwide/workdir/demos/concurrent-tasks)
[INFO] [stderr]     Checking redis-cache v0.1.0 (/opt/rustwide/workdir/demos/redis-cache)
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]    --> demos/concurrent-tasks/src/main.rs:311:9
[INFO] [stdout]     |
[INFO] [stdout] 311 |     use super::*;
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `delete`, `post`, and `put`
[INFO] [stdout]  --> demos/http-api/src/main.rs:9:15
[INFO] [stdout]   |
[INFO] [stdout] 9 |     routing::{delete, get, post, put},
[INFO] [stdout]   |               ^^^^^^       ^^^^  ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `delete`, `post`, and `put`
[INFO] [stdout]  --> demos/http-api/src/main.rs:9:15
[INFO] [stdout]   |
[INFO] [stdout] 9 |     routing::{delete, get, post, put},
[INFO] [stdout]   |               ^^^^^^       ^^^^  ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking rdkafka v0.36.2
[INFO] [stderr]     Checking kafka-messaging v0.1.0 (/opt/rustwide/workdir/demos/kafka-messaging)
[INFO] [stderr]     Checking integrated-service v0.1.0 (/opt/rustwide/workdir/demos/integrated-service)
[INFO] [stdout] warning: unused imports: `delete` and `post`
[INFO] [stdout]   --> demos/integrated-service/src/main.rs:15:15
[INFO] [stdout]    |
[INFO] [stdout] 15 |     routing::{delete, get, post},
[INFO] [stdout]    |               ^^^^^^       ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `delete` and `post`
[INFO] [stdout]   --> demos/integrated-service/src/main.rs:15:15
[INFO] [stdout]    |
[INFO] [stdout] 15 |     routing::{delete, get, post},
[INFO] [stdout]    |               ^^^^^^       ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2m 08s
[INFO] running `Command { std: "docker" "inspect" "35dfe66d4831819be02044a74c0bc6aeffc5207155d3af3d9f403ba77b18e3bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "35dfe66d4831819be02044a74c0bc6aeffc5207155d3af3d9f403ba77b18e3bc", kill_on_drop: false }`
[INFO] [stdout] 35dfe66d4831819be02044a74c0bc6aeffc5207155d3af3d9f403ba77b18e3bc
