[INFO] cloning repository https://github.com/zongzi531/rust-learning
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zongzi531/rust-learning" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzongzi531%2Frust-learning", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzongzi531%2Frust-learning'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dcf7c60aecad6474095e9df0da0409a19ff70b09
[INFO] checking zongzi531/rust-learning against try#c9557a20e5ef2e0e02c29a5fafd850d1b7cf1e4f for pr-133502-21
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzongzi531%2Frust-learning" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/zongzi531/rust-learning
[INFO] finished tweaking git repo https://github.com/zongzi531/rust-learning
[INFO] tweaked toml for git repo https://github.com/zongzi531/rust-learning written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/zongzi531/rust-learning on toolchain c9557a20e5ef2e0e02c29a5fafd850d1b7cf1e4f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c9557a20e5ef2e0e02c29a5fafd850d1b7cf1e4f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/zongzi531/rust-learning 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" "+c9557a20e5ef2e0e02c29a5fafd850d1b7cf1e4f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:29356a839a4d14451438f794ce8414e707d72405f44418718d724d22562fe786" "/opt/rustwide/cargo-home/bin/cargo" "+c9557a20e5ef2e0e02c29a5fafd850d1b7cf1e4f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 84e37071c94ec32257e41b3a0195d4283f5f903d809d61474449541065409782
[INFO] running `Command { std: "docker" "start" "-a" "84e37071c94ec32257e41b3a0195d4283f5f903d809d61474449541065409782", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "84e37071c94ec32257e41b3a0195d4283f5f903d809d61474449541065409782", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "84e37071c94ec32257e41b3a0195d4283f5f903d809d61474449541065409782", kill_on_drop: false }`
[INFO] [stdout] 84e37071c94ec32257e41b3a0195d4283f5f903d809d61474449541065409782
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:29356a839a4d14451438f794ce8414e707d72405f44418718d724d22562fe786" "/opt/rustwide/cargo-home/bin/cargo" "+c9557a20e5ef2e0e02c29a5fafd850d1b7cf1e4f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 035b115f34eca64e4adfa9034e4cab3c5f35f364bae958d455ccc118dc5b0119
[INFO] running `Command { std: "docker" "start" "-a" "035b115f34eca64e4adfa9034e4cab3c5f35f364bae958d455ccc118dc5b0119", kill_on_drop: false }`
[INFO] [stderr]     Checking utf8_slice v1.0.0
[INFO] [stderr]     Checking rust-learning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]  --> src/bin/compound-types-struct-5.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Person {
[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 `build_person` is never used
[INFO] [stdout]  --> src/bin/compound-types-struct-5.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn build_person(name: String, age: u8) -> Person {
[INFO] [stdout]   |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> src/bin/ownership-borrowing-8.rs:9:18
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn borrow_object(s: &mut String) {}
[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: field `content` is never read
[INFO] [stdout]   --> src/bin/generics-traits-traits-5.rs:12:3
[INFO] [stdout]    |
[INFO] [stdout]  9 | struct Post {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 12 |   content: String,
[INFO] [stdout]    |   ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Post` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]  --> src/bin/compound-types-enum-4.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 |   Move { x: i32, y: i32 },
[INFO] [stdout]   |   ----   ^       ^
[INFO] [stdout]   |   |
[INFO] [stdout]   |   fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, and `2` are never read
[INFO] [stdout]  --> src/bin/compound-types-enum-4.rs:8:15
[INFO] [stdout]   |
[INFO] [stdout] 8 |   ChangeColor(i32, i32, i32),
[INFO] [stdout]   |   ----------- ^^^  ^^^  ^^^
[INFO] [stdout]   |   |
[INFO] [stdout]   |   fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 8 -   ChangeColor(i32, i32, i32),
[INFO] [stdout] 8 +   ChangeColor((), (), ()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Write` is never constructed
[INFO] [stdout]  --> src/bin/compound-types-enum-4.rs:7:3
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum Message {
[INFO] [stdout]   |      ------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 7 |   Write(String),
[INFO] [stdout]   |   ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]  --> src/bin/flow-control-7.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 |   for i in 0..=100 {
[INFO] [stdout]   |       ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> src/bin/lifetime-basic-10.rs:9:28
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn longest<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout]   |                            ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `nput` is never used
[INFO] [stdout]  --> src/bin/lifetime-basic-10.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn nput(x: &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 `pass` is never used
[INFO] [stdout]  --> src/bin/lifetime-basic-10.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn pass(x: &i32) -> &i32 { x }
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]  --> src/bin/lifetime-basic-10.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn longest<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Owner` is never constructed
[INFO] [stdout]   --> src/bin/lifetime-basic-10.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct Owner(i32);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `add_one` and `print` are never used
[INFO] [stdout]   --> src/bin/lifetime-basic-10.rs:16:6
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl Owner {
[INFO] [stdout]    | ---------- methods in this implementation
[INFO] [stdout] 16 |   fn add_one(&mut self) { self.0 += 1; }
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 17 |   fn print(&self) {
[INFO] [stdout]    |      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]   --> src/bin/lifetime-basic-10.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | struct Person<'a> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Either` is never used
[INFO] [stdout]   --> src/bin/lifetime-basic-10.rs:27:6
[INFO] [stdout]    |
[INFO] [stdout] 27 | enum Either<'a> {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]  --> src/bin/compound-types-slice-1.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 |   let s1: &[i32] = &arr[0..2];
[INFO] [stdout]   |       ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]  --> src/bin/compound-types-slice-1.rs:7:7
[INFO] [stdout]   |
[INFO] [stdout] 7 |   let s2: &str = "hello, world" as &str;
[INFO] [stdout]   |       ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/bin/ownership-borrowing-9.rs:11:18
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn borrow_object(s: &String) {}
[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: function `get_option` is never used
[INFO] [stdout]  --> src/bin/basic-types-functions-4.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn get_option(tp: u8) -> Option<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 `never_return_fn` is never used
[INFO] [stdout]   --> src/bin/basic-types-functions-4.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn never_return_fn() -> ! {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/bin/compound-types-tuple-5.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 |   let (x, y, z): (i32, i32, i32);
[INFO] [stdout]   |        ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> src/bin/compound-types-tuple-5.rs:2:11
[INFO] [stdout]   |
[INFO] [stdout] 2 |   let (x, y, z): (i32, i32, i32);
[INFO] [stdout]   |           ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]  --> src/bin/compound-types-tuple-5.rs:2:14
[INFO] [stdout]   |
[INFO] [stdout] 2 |   let (x, y, z): (i32, i32, i32);
[INFO] [stdout]   |              ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `msg1`
[INFO] [stdout]   --> src/bin/compound-types-enum-2.rs:11:7
[INFO] [stdout]    |
[INFO] [stdout] 11 |   let msg1 = Message::Move{ x: 1, y: 1 }; // 使用x = 1, y = 2 来初始化
[INFO] [stdout]    |       ^^^^ help: if this is intentional, prefix it with an underscore: `_msg1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `msg2`
[INFO] [stdout]   --> src/bin/compound-types-enum-2.rs:12:7
[INFO] [stdout]    |
[INFO] [stdout] 12 |   let msg2 = Message::Write("hello, world!".to_string()); // 使用 "hello, world!" 来初始化
[INFO] [stdout]    |       ^^^^ help: if this is intentional, prefix it with an underscore: `_msg2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]  --> src/bin/compound-types-enum-2.rs:5:10
[INFO] [stdout]   |
[INFO] [stdout] 5 |   Move { x: i32, y: i32 },
[INFO] [stdout]   |   ----   ^       ^
[INFO] [stdout]   |   |
[INFO] [stdout]   |   fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/bin/compound-types-enum-2.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |   Write(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] 6 -   Write(String),
[INFO] [stdout] 6 +   Write(()),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit` and `ChangeColor` are never constructed
[INFO] [stdout]  --> src/bin/compound-types-enum-2.rs:4:3
[INFO] [stdout]   |
[INFO] [stdout] 3 | enum Message {
[INFO] [stdout]   |      ------- variants in this enum
[INFO] [stdout] 4 |   Quit,
[INFO] [stdout]   |   ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 7 |   ChangeColor(i32, i32, i32),
[INFO] [stdout]   |   ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u2`
[INFO] [stdout]   --> src/bin/compound-types-struct-6.rs:17:7
[INFO] [stdout]    |
[INFO] [stdout] 17 |   let u2 = set_email(u1);
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_u2`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `active`, `username`, `email`, and `sign_in_count` are never read
[INFO] [stdout]  --> src/bin/compound-types-struct-6.rs:4:3
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct User {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 4 |   active: bool,
[INFO] [stdout]   |   ^^^^^^
[INFO] [stdout] 5 |   username: String,
[INFO] [stdout]   |   ^^^^^^^^
[INFO] [stdout] 6 |   email: String,
[INFO] [stdout]   |   ^^^^^
[INFO] [stdout] 7 |   sign_in_count: u64,
[INFO] [stdout]   |   ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arrays`
[INFO] [stdout]  --> src/bin/generics-traits-const-generics-1.rs:8:7
[INFO] [stdout]   |
[INFO] [stdout] 8 |   let arrays = [
[INFO] [stdout]   |       ^^^^^^ help: if this is intentional, prefix it with an underscore: `_arrays`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `data` is never read
[INFO] [stdout]  --> src/bin/generics-traits-const-generics-1.rs:4:3
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Array<T, const N: usize> {
[INFO] [stdout]   |        ----- field in this struct
[INFO] [stdout] 4 |   data : [T; N]
[INFO] [stdout]   |   ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]  --> src/bin/compound-types-struct-5.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Person {
[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 `build_person` is never used
[INFO] [stdout]  --> src/bin/compound-types-struct-5.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn build_person(name: String, age: u8) -> Person {
[INFO] [stdout]   |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arrays`
[INFO] [stdout]  --> src/bin/generics-traits-const-generics-1.rs:8:7
[INFO] [stdout]   |
[INFO] [stdout] 8 |   let arrays = [
[INFO] [stdout]   |       ^^^^^^ help: if this is intentional, prefix it with an underscore: `_arrays`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `data` is never read
[INFO] [stdout]  --> src/bin/generics-traits-const-generics-1.rs:4:3
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Array<T, const N: usize> {
[INFO] [stdout]   |        ----- field in this struct
[INFO] [stdout] 4 |   data : [T; N]
[INFO] [stdout]   |   ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `fly` is never used
[INFO] [stdout]  --> src/bin/generics-traits-trait-object-2.rs:7:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl Duck {
[INFO] [stdout]   | --------- method in this implementation
[INFO] [stdout] 7 |   fn fly(&self) {
[INFO] [stdout]   |      ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `fly` is never used
[INFO] [stdout]   --> src/bin/generics-traits-trait-object-2.rs:13:6
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Swan {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 13 |   fn fly(&self) {
[INFO] [stdout]    |      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `manager` is never read
[INFO] [stdout]  --> src/bin/lifetime-advance-6.rs:3:3
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Interface<'b, 'a: 'b> {
[INFO] [stdout]   |        --------- field in this struct
[INFO] [stdout] 3 |   manager: &'b mut Manager<'a>
[INFO] [stdout]   |   ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ImportantExcerpt` is never constructed
[INFO] [stdout]  --> src/bin/lifetime-basic-9.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct ImportantExcerpt<'a> {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `level` is never used
[INFO] [stdout]  --> src/bin/lifetime-basic-9.rs:7:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]   | ----------------------------- method in this implementation
[INFO] [stdout] 7 |   fn level(&'a self) -> i32 {
[INFO] [stdout]   |      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `CliError` is never used
[INFO] [stdout]  --> src/bin/type-conversions-from-into-3.rs:6:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | enum CliError {
[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 `open_and_parse_file` is never used
[INFO] [stdout]   --> src/bin/type-conversions-from-into-3.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn open_and_parse_file(file_name: &str) -> Result<i32, CliError> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]  --> src/bin/type-conversions-as-2.rs:8:7
[INFO] [stdout]   |
[INFO] [stdout] 8 |   let v = 1000 as u8;
[INFO] [stdout]   |       ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Zero` and `Two` are never constructed
[INFO] [stdout]  --> src/bin/compound-types-enum-1.rs:4:3
[INFO] [stdout]   |
[INFO] [stdout] 3 | enum Number {
[INFO] [stdout]   |      ------ variants in this enum
[INFO] [stdout] 4 |   Zero,
[INFO] [stdout]   |   ^^^^
[INFO] [stdout] 5 |   One,
[INFO] [stdout] 6 |   Two,
[INFO] [stdout]   |   ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Zero` and `Two` are never constructed
[INFO] [stdout]   --> src/bin/compound-types-enum-1.rs:10:3
[INFO] [stdout]    |
[INFO] [stdout]  9 | enum Number1 {
[INFO] [stdout]    |      ------- variants in this enum
[INFO] [stdout] 10 |   Zero = 0,
[INFO] [stdout]    |   ^^^^
[INFO] [stdout] 11 |   One,
[INFO] [stdout] 12 |   Two,
[INFO] [stdout]    |   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Zero` and `Two` are never constructed
[INFO] [stdout]   --> src/bin/compound-types-enum-1.rs:17:3
[INFO] [stdout]    |
[INFO] [stdout] 16 | enum Number2 {
[INFO] [stdout]    |      ------- variants in this enum
[INFO] [stdout] 17 |   Zero = 0,
[INFO] [stdout]    |   ^^^^
[INFO] [stdout] 18 |   One = 1,
[INFO] [stdout] 19 |   Two = 2,
[INFO] [stdout]    |   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]  --> src/bin/ownership-borrowing-11.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 |   let r1 = &mut s;
[INFO] [stdout]   |       ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]  --> src/bin/ownership-borrowing-11.rs:6:7
[INFO] [stdout]   |
[INFO] [stdout] 6 |   let r2 = &mut s;
[INFO] [stdout]   |       ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]   --> src/bin/pattern-match-match-iflet-7.rs:10:6
[INFO] [stdout]    |
[INFO] [stdout] 10 |   if let Foo::Bar(i) = a {
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]    = help: consider replacing the `if let` with a `let`
[INFO] [stdout]    = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `invalid_output` is never used
[INFO] [stdout]   --> src/bin/lifetime-basic-4.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn invalid_output<'a>(s: &'a String) -> &'a String { 
[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 `match_number` is never used
[INFO] [stdout]  --> src/bin/pattern-match-patterns-1.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn match_number(n: 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: fields `a` and `b` are never read
[INFO] [stdout]  --> src/bin/lifetime-basic-7.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Example<'a, 'b> {
[INFO] [stdout]   |        ------- fields in this struct
[INFO] [stdout] 8 |     a: &'a u32,
[INFO] [stdout]   |     ^
[INFO] [stdout] 9 |     b: &'b NoCopyType
[INFO] [stdout]   |     ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Example` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Write`, and `ChangeColor` are never constructed
[INFO] [stdout]  --> src/bin/compound-types-enum-3.rs:4:3
[INFO] [stdout]   |
[INFO] [stdout] 3 | enum Message {
[INFO] [stdout]   |      ------- variants in this enum
[INFO] [stdout] 4 |   Quit,
[INFO] [stdout]   |   ^^^^
[INFO] [stdout] 5 |   Move { x: i32, y: i32 },
[INFO] [stdout] 6 |   Write(String),
[INFO] [stdout]   |   ^^^^^
[INFO] [stdout] 7 |   ChangeColor(i32, 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: struct `Color` is never constructed
[INFO] [stdout]  --> src/bin/compound-types-struct-3.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Color(i32, 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: unused variable: `t`
[INFO] [stdout]  --> src/bin/compound-types-tuple-1.rs:7:7
[INFO] [stdout]   |
[INFO] [stdout] 7 |   let t: (u8, u16, i64, &str, String) = (1u8, 2u16, 3i64, "hello", String::from(", world"));
[INFO] [stdout]   |       ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]  --> src/bin/compound-types-string-8.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 |   let s1: &str = &s;
[INFO] [stdout]   |       ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/bin/pattern-match-match-iflet-3.rs:7:15
[INFO] [stdout]   |
[INFO] [stdout] 7 |   ChangeColor(i32, i32, i32),
[INFO] [stdout]   |   ----------- ^^^
[INFO] [stdout]   |   |
[INFO] [stdout]   |   field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[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] 7 -   ChangeColor(i32, i32, i32),
[INFO] [stdout] 7 +   ChangeColor((), i32, i32),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Write` is never constructed
[INFO] [stdout]  --> src/bin/pattern-match-match-iflet-3.rs:6:3
[INFO] [stdout]   |
[INFO] [stdout] 3 | enum Message {
[INFO] [stdout]   |      ------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 6 |   Write(String),
[INFO] [stdout]   |   ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]  --> src/bin/flow-control-8.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 |   for i in 0..=100 {
[INFO] [stdout]   |       ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]  --> src/bin/generics-traits-traits-8.rs:8:6
[INFO] [stdout]   |
[INFO] [stdout] 7 | impl<T> Pair<T> {
[INFO] [stdout]   | --------------- associated function in this implementation
[INFO] [stdout] 8 |   fn new(x: T, y: T) -> Self {
[INFO] [stdout]   |      ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ImportantExcerpt` is never constructed
[INFO] [stdout]  --> src/bin/lifetime-advance-2.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct ImportantExcerpt<'a> {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `announce_and_return_part` is never used
[INFO] [stdout]  --> src/bin/lifetime-advance-2.rs:7:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl<'a: 'b, 'b> ImportantExcerpt<'a> {
[INFO] [stdout]   | ------------------------------------- method in this implementation
[INFO] [stdout] 7 |   fn announce_and_return_part(&'a self, announcement: &'b str) -> &'b str {
[INFO] [stdout]   |      ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/bin/ownership-borrowing-3.rs:4:7
[INFO] [stdout]   |
[INFO] [stdout] 4 |   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/bin/ownership-borrowing-3.rs:9:18
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn borrow_object(s: &String) {}
[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: `v`
[INFO] [stdout]  --> src/bin/basic-types-functions-5.rs:6:7
[INFO] [stdout]   |
[INFO] [stdout] 6 |   let v = match b {
[INFO] [stdout]   |       ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p`
[INFO] [stdout]   --> src/bin/generics-traits-generics-4.rs:10:7
[INFO] [stdout]    |
[INFO] [stdout] 10 |   let p = Point{x: 5, y : "hello".to_string()};
[INFO] [stdout]    |       ^ help: if this is intentional, prefix it with an underscore: `_p`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]  --> src/bin/generics-traits-generics-4.rs:4:3
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Point<T, U> {
[INFO] [stdout]   |        ----- fields in this struct
[INFO] [stdout] 4 |   x: T,
[INFO] [stdout]   |   ^
[INFO] [stdout] 5 |   y: U,
[INFO] [stdout]   |   ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]  --> src/bin/method-5.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Rectangle {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `area` is never used
[INFO] [stdout]  --> src/bin/method-5.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 8 | impl Rectangle {
[INFO] [stdout]   | -------------- method in this implementation
[INFO] [stdout] 9 |   fn area(&self) -> u32 {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `can_hold` is never used
[INFO] [stdout]   --> src/bin/method-5.rs:15:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl Rectangle {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] 15 |   fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Write`, and `ChangeColor` are never constructed
[INFO] [stdout]  --> src/bin/compound-types-enum-3.rs:4:3
[INFO] [stdout]   |
[INFO] [stdout] 3 | enum Message {
[INFO] [stdout]   |      ------- variants in this enum
[INFO] [stdout] 4 |   Quit,
[INFO] [stdout]   |   ^^^^
[INFO] [stdout] 5 |   Move { x: i32, y: i32 },
[INFO] [stdout] 6 |   Write(String),
[INFO] [stdout]   |   ^^^^^
[INFO] [stdout] 7 |   ChangeColor(i32, 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: struct `ImportantExcerpt` is never constructed
[INFO] [stdout]  --> src/bin/lifetime-advance-2.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct ImportantExcerpt<'a> {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `announce_and_return_part` is never used
[INFO] [stdout]  --> src/bin/lifetime-advance-2.rs:7:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl<'a: 'b, 'b> ImportantExcerpt<'a> {
[INFO] [stdout]   | ------------------------------------- method in this implementation
[INFO] [stdout] 7 |   fn announce_and_return_part(&'a self, announcement: &'b str) -> &'b str {
[INFO] [stdout]   |      ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `call_on_ref_zero` is never used
[INFO] [stdout]  --> src/bin/lifetime-advance-4.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn call_on_ref_zero<F>(f: F) where for<'a> F: Fn(&'a 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: unused variable: `s`
[INFO] [stdout]  --> src/bin/ownership-borrowing-8.rs:9:18
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn borrow_object(s: &mut String) {}
[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: `i3`
[INFO] [stdout]   --> src/bin/type-conversions-from-into-1.rs:12:6
[INFO] [stdout]    |
[INFO] [stdout] 12 |  let i3: u32 = 'a'.into();
[INFO] [stdout]    |      ^^ help: if this is intentional, prefix it with an underscore: `_i3`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/bin/type-conversions-from-into-1.rs:15:6
[INFO] [stdout]    |
[INFO] [stdout] 15 |  let s: String = 'a'.into();
[INFO] [stdout]    |      ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i3_`
[INFO] [stdout]   --> src/bin/type-conversions-from-into-1.rs:16:6
[INFO] [stdout]    |
[INFO] [stdout] 16 |  let i3_: u32 = 'a' as u32 ;
[INFO] [stdout]    |      ^^^ help: if this is intentional, prefix it with an underscore: `_i3_`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s_`
[INFO] [stdout]   --> src/bin/type-conversions-from-into-1.rs:18:6
[INFO] [stdout]    |
[INFO] [stdout] 18 |  let s_: String = String::from('a');
[INFO] [stdout]    |      ^^ help: if this is intentional, prefix it with an underscore: `_s_`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/bin/compound-types-array-4.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct I64(i64);
[INFO] [stdout]   |        --- ^^^
[INFO] [stdout]   |        |
[INFO] [stdout]   |        field in this struct
[INFO] [stdout]   |
[INFO] [stdout]   = help: consider removing this field
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/bin/compound-types-array-4.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Char(char);
[INFO] [stdout]   |        ---- ^^^^
[INFO] [stdout]   |        |
[INFO] [stdout]   |        field in this struct
[INFO] [stdout]   |
[INFO] [stdout]   = help: consider removing this field
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/bin/compound-types-array-4.rs:10:7
[INFO] [stdout]    |
[INFO] [stdout] 10 |   I64(i64),
[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] 10 -   I64(i64),
[INFO] [stdout] 10 +   I64(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/bin/compound-types-array-4.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 |   Char(char),
[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] 11 -   Char(char),
[INFO] [stdout] 11 +   Char(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `a` and `b` are never read
[INFO] [stdout]  --> src/bin/lifetime-basic-7.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Example<'a, 'b> {
[INFO] [stdout]   |        ------- fields in this struct
[INFO] [stdout] 8 |     a: &'a u32,
[INFO] [stdout]   |     ^
[INFO] [stdout] 9 |     b: &'b NoCopyType
[INFO] [stdout]   |     ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Example` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]  --> src/bin/compound-types-tuple-1.rs:7:7
[INFO] [stdout]   |
[INFO] [stdout] 7 |   let t: (u8, u16, i64, &str, String) = (1u8, 2u16, 3i64, "hello", String::from(", world"));
[INFO] [stdout]   |       ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::str::from_utf8` with an invalid literal always return an error
[INFO] [stdout]   --> src/bin/compound-types-string-10-1.rs:34:11
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let shift_jis = b"\x82\xe6\x82\xa8\x82\xb1\x82\xbb"; // "ようこそ" in SHIFT-JIS
[INFO] [stdout]    |                     ----------------------------------- the literal was valid UTF-8 up to the 0 bytes
[INFO] [stdout] ...
[INFO] [stdout] 34 |     match str::from_utf8(shift_jis) {
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(invalid_from_utf8)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]  --> src/bin/lifetime-basic-3.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Result`
[INFO] [stdout]  --> src/bin/crate-module-use-pub-1.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::Result;
[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 import: `std::io::Result as IoResult`
[INFO] [stdout]  --> src/bin/crate-module-use-pub-1.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::Result as IoResult;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `a` and `b` are never read
[INFO] [stdout]  --> src/bin/lifetime-static-2.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Config {
[INFO] [stdout]   |        ------ fields in this struct
[INFO] [stdout] 3 |     a: String,
[INFO] [stdout]   |     ^
[INFO] [stdout] 4 |     b: String,
[INFO] [stdout]   |     ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Config` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c1`
[INFO] [stdout]  --> src/bin/type-conversions-as-1.rs:8:7
[INFO] [stdout]   |
[INFO] [stdout] 8 |   let c1: char = decimal as u8 as char;
[INFO] [stdout]   |       ^^ help: if this is intentional, prefix it with an underscore: `_c1`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c2`
[INFO] [stdout]  --> src/bin/type-conversions-as-1.rs:9:7
[INFO] [stdout]   |
[INFO] [stdout] 9 |   let c2 = integer as char;
[INFO] [stdout]   |       ^^ help: if this is intentional, prefix it with an underscore: `_c2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static variable `config` should have an upper case name
[INFO] [stdout]  --> src/bin/lifetime-static-2.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | static mut config: Option<&mut Config> = None;
[INFO] [stdout]   |            ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_upper_case_globals)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] help: convert the identifier to upper case
[INFO] [stdout]   |
[INFO] [stdout] 6 - static mut config: Option<&mut Config> = None;
[INFO] [stdout] 6 + static mut CONFIG: Option<&mut Config> = None;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: creating a shared reference to mutable static
[INFO] [stdout]   --> src/bin/lifetime-static-2.rs:23:25
[INFO] [stdout]    |
[INFO] [stdout] 23 |         println!("{:?}",config)
[INFO] [stdout]    |                         ^^^^^^ shared reference to mutable static
[INFO] [stdout]    |
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2024/static-mut-references.html>
[INFO] [stdout]    = note: shared references to mutable statics are dangerous; it's undefined behavior if the static is mutated or if a mutable reference is created for it while the shared reference lives
[INFO] [stdout]    = note: `#[warn(static_mut_refs)]` (part of `#[warn(rust_2024_compatibility)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `match` scrutinee expression
[INFO] [stdout]   --> src/bin/method-6.rs:12:13
[INFO] [stdout]    |
[INFO] [stdout] 12 |       match (*self) {
[INFO] [stdout]    |             ^     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 12 -       match (*self) {
[INFO] [stdout] 12 +       match *self {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> src/bin/compound-types-string-1.rs:4:7
[INFO] [stdout]   |
[INFO] [stdout] 4 |   let s: &str = "hello, world";
[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: variants `Red` and `Green` are never constructed
[INFO] [stdout]  --> src/bin/method-6.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | enum TrafficLightColor {
[INFO] [stdout]   |      ----------------- variants in this enum
[INFO] [stdout] 4 |     Red,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 5 |     Yellow,
[INFO] [stdout] 6 |     Green,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `TrafficLightColor` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `call_on_ref_zero` is never used
[INFO] [stdout]  --> src/bin/lifetime-advance-4.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn call_on_ref_zero<F>(f: F) where for<'a> F: Fn(&'a 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: unused variable: `arr0`
[INFO] [stdout]  --> src/bin/compound-types-array-2.rs:4:7
[INFO] [stdout]   |
[INFO] [stdout] 4 |   let arr0 = [1, 2, 3];
[INFO] [stdout]   |       ^^^^ help: if this is intentional, prefix it with an underscore: `_arr0`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]  --> src/bin/compound-types-enum-5.rs:8:6
[INFO] [stdout]   |
[INFO] [stdout] 8 |   if let n = six {
[INFO] [stdout]   |      ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]   = help: consider replacing the `if let` with a `let`
[INFO] [stdout]   = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `none`
[INFO] [stdout]  --> src/bin/compound-types-enum-5.rs:6:7
[INFO] [stdout]   |
[INFO] [stdout] 6 |   let none = plus_one(None);
[INFO] [stdout]   |       ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: you might have meant to pattern match on the similarly named variant `None`
[INFO] [stdout]   |
[INFO] [stdout] 6 -   let none = plus_one(None);
[INFO] [stdout] 6 +   let std::prelude::v1::None = plus_one(None);
[INFO] [stdout]   |
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]   |
[INFO] [stdout] 6 |   let _none = plus_one(None);
[INFO] [stdout]   |       +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/bin/ownership-borrowing-7.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 |   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: method `fly` is never used
[INFO] [stdout]   --> src/bin/generics-traits-trait-object-1.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl Swan {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 14 |   fn fly(&self) {
[INFO] [stdout]    |      ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/bin/compound-types-array-4.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct I64(i64);
[INFO] [stdout]   |        --- ^^^
[INFO] [stdout]   |        |
[INFO] [stdout]   |        field in this struct
[INFO] [stdout]   |
[INFO] [stdout]   = help: consider removing this field
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/bin/compound-types-array-4.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Char(char);
[INFO] [stdout]   |        ---- ^^^^
[INFO] [stdout]   |        |
[INFO] [stdout]   |        field in this struct
[INFO] [stdout]   |
[INFO] [stdout]   = help: consider removing this field
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/bin/compound-types-array-4.rs:10:7
[INFO] [stdout]    |
[INFO] [stdout] 10 |   I64(i64),
[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] 10 -   I64(i64),
[INFO] [stdout] 10 +   I64(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/bin/compound-types-array-4.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 |   Char(char),
[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] 11 -   Char(char),
[INFO] [stdout] 11 +   Char(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/bin/lifetime-basic-6.rs:5:21
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Borrowed<'a>(&'a i32);
[INFO] [stdout]   |        --------     ^^^^^^^
[INFO] [stdout]   |        |
[INFO] [stdout]   |        field in this struct
[INFO] [stdout]   |
[INFO] [stdout]   = help: consider removing this field
[INFO] [stdout]   = note: `Borrowed` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/bin/lifetime-basic-6.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout]  9 | struct NamedBorrowed<'a> {
[INFO] [stdout]    |        ------------- fields in this struct
[INFO] [stdout] 10 |     x: &'a i32,
[INFO] [stdout]    |     ^
[INFO] [stdout] 11 |     y: &'a i32,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `NamedBorrowed` 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 `0` is never read
[INFO] [stdout]   --> src/bin/lifetime-basic-6.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     Num(i32),
[INFO] [stdout]    |     --- ^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Either` 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] 16 -     Num(i32),
[INFO] [stdout] 16 +     Num(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/bin/lifetime-basic-6.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     Ref(&'a i32),
[INFO] [stdout]    |     --- ^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Either` 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] 17 -     Ref(&'a i32),
[INFO] [stdout] 17 +     Ref(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Result`
[INFO] [stdout]  --> src/bin/crate-module-use-pub-1.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::Result;
[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 import: `std::io::Result as IoResult`
[INFO] [stdout]  --> src/bin/crate-module-use-pub-1.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::Result as IoResult;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]  --> src/bin/flow-control-4.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 |   for name in &names {
[INFO] [stdout]   |       ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> src/bin/flow-control-4.rs:13:7
[INFO] [stdout]    |
[INFO] [stdout] 13 |   for n in numbers {
[INFO] [stdout]    |       ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TrafficLight` is never constructed
[INFO] [stdout]  --> src/bin/method-3.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct TrafficLight {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `show_state` and `change_state` are never used
[INFO] [stdout]   --> src/bin/method-3.rs:7:10
[INFO] [stdout]    |
[INFO] [stdout]  5 | impl TrafficLight {
[INFO] [stdout]    | ----------------- methods in this implementation
[INFO] [stdout]  6 |   // 使用 `Self` 填空
[INFO] [stdout]  7 |   pub fn show_state(self: &Self)  {
[INFO] [stdout]    |          ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 12 |   pub fn change_state(mut self) {
[INFO] [stdout]    |          ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0001]: `-Znext-solver=globally` and `generic_const_exprs` are incompatible, using them at the same time is not allowed
[INFO] [stdout]  --> src/bin/generics-traits-const-generics-3.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(generic_const_exprs)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: remove one of these features
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0001`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-learning` (bin "generics-traits-const-generics-3" test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: fields `width` and `height` are never read
[INFO] [stdout]  --> src/bin/compound-types-struct-7.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Rectangle {
[INFO] [stdout]   |        --------- fields in this struct
[INFO] [stdout] 5 |     width: u32,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 6 |     height: u32,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `i` should have an upper case name
[INFO] [stdout]   --> src/bin/lifetime-static-5.rs:19:11
[INFO] [stdout]    |
[INFO] [stdout] 19 |     const i: i32 = 5;
[INFO] [stdout]    |           ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_upper_case_globals)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] help: convert the identifier to upper case (notice the capitalization)
[INFO] [stdout]    |
[INFO] [stdout] 19 -     const i: i32 = 5;
[INFO] [stdout] 19 +     const I: i32 = 5;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "035b115f34eca64e4adfa9034e4cab3c5f35f364bae958d455ccc118dc5b0119", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "035b115f34eca64e4adfa9034e4cab3c5f35f364bae958d455ccc118dc5b0119", kill_on_drop: false }`
[INFO] [stdout] 035b115f34eca64e4adfa9034e4cab3c5f35f364bae958d455ccc118dc5b0119
