[INFO] cloning repository https://github.com/liulinboyi/rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/liulinboyi/rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fliulinboyi%2Frust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fliulinboyi%2Frust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] af4ca473c5b4852c7e0ef41a03108ef62395539b
[INFO] checking liulinboyi/rust against master#5518eaa946291f00471af8b254b2a1715f234882 for pr-120393
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fliulinboyi%2Frust" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/liulinboyi/rust on toolchain 5518eaa946291f00471af8b254b2a1715f234882
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5518eaa946291f00471af8b254b2a1715f234882" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/liulinboyi/rust
[INFO] finished tweaking git repo https://github.com/liulinboyi/rust
[INFO] tweaked toml for git repo https://github.com/liulinboyi/rust written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/liulinboyi/rust 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" "+5518eaa946291f00471af8b254b2a1715f234882" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+5518eaa946291f00471af8b254b2a1715f234882" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4ca42451e6a25be5a19b897abe093ff40efe1e5e2bbc013ab482dccaced049ca
[INFO] running `Command { std: "docker" "start" "-a" "4ca42451e6a25be5a19b897abe093ff40efe1e5e2bbc013ab482dccaced049ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4ca42451e6a25be5a19b897abe093ff40efe1e5e2bbc013ab482dccaced049ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4ca42451e6a25be5a19b897abe093ff40efe1e5e2bbc013ab482dccaced049ca", kill_on_drop: false }`
[INFO] [stdout] 4ca42451e6a25be5a19b897abe093ff40efe1e5e2bbc013ab482dccaced049ca
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+5518eaa946291f00471af8b254b2a1715f234882" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b13f5ff6bc2bdcb8d125469b15202fa32c3203a552f303e9e8ad81bbb5ffda16
[INFO] running `Command { std: "docker" "start" "-a" "b13f5ff6bc2bdcb8d125469b15202fa32c3203a552f303e9e8ad81bbb5ffda16", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.106
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.15
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking hello v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `core::panic`
[INFO] [stdout]  --> src/error/mod.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use core::panic;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::sleep`
[INFO] [stdout]  --> src/tiem/mod.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::thread::sleep;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::panic`
[INFO] [stdout]  --> src/error/mod.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use core::panic;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::sleep`
[INFO] [stdout]  --> src/tiem/mod.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::thread::sleep;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `files`
[INFO] [stdout]    --> src/error/mod.rs:134:9
[INFO] [stdout]     |
[INFO] [stdout] 134 |     let files = file();
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_files`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]    --> src/error/mod.rs:147:12
[INFO] [stdout]     |
[INFO] [stdout] 147 |         Ok(data) => {
[INFO] [stdout]     |            ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]    --> src/error/mod.rs:164:12
[INFO] [stdout]     |
[INFO] [stdout] 164 |         Ok(data) => {}
[INFO] [stdout]     |            ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/error/mod.rs:36:24
[INFO] [stdout]    |
[INFO] [stdout] 36 |     fn divide_by_three(x: u32) -> u32 {
[INFO] [stdout]    |                        ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `content`
[INFO] [stdout]    --> src/error/mod.rs:115:13
[INFO] [stdout]     |
[INFO] [stdout] 115 |         let content: &str = std::str::from_utf8(&data)?;
[INFO] [stdout]     |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_content`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `files`
[INFO] [stdout]    --> src/error/mod.rs:134:9
[INFO] [stdout]     |
[INFO] [stdout] 134 |     let files = file();
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_files`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]    --> src/error/mod.rs:147:12
[INFO] [stdout]     |
[INFO] [stdout] 147 |         Ok(data) => {
[INFO] [stdout]     |            ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]    --> src/error/mod.rs:164:12
[INFO] [stdout]     |
[INFO] [stdout] 164 |         Ok(data) => {}
[INFO] [stdout]     |            ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/error/mod.rs:36:24
[INFO] [stdout]    |
[INFO] [stdout] 36 |     fn divide_by_three(x: u32) -> u32 {
[INFO] [stdout]    |                        ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `content`
[INFO] [stdout]    --> src/error/mod.rs:115:13
[INFO] [stdout]     |
[INFO] [stdout] 115 |         let content: &str = std::str::from_utf8(&data)?;
[INFO] [stdout]     |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_content`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `err`
[INFO] [stdout]   --> src/guess_number.rs:21:17
[INFO] [stdout]    |
[INFO] [stdout] 21 |             Err(err) => continue,
[INFO] [stdout]    |                 ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `err`
[INFO] [stdout]   --> src/guess_number.rs:21:17
[INFO] [stdout]    |
[INFO] [stdout] 21 |             Err(err) => continue,
[INFO] [stdout]    |                 ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `unit`
[INFO] [stdout]   --> src/my_struct.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let unit = Unit;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_unit`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/my_type_conversion.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let a = [0u8, 0u8, 0u8, 0u8];
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `box_arr`
[INFO] [stdout]    --> src/pointer_box/mod.rs:105:9
[INFO] [stdout]     |
[INFO] [stdout] 105 |     let box_arr = Box::new(arr); // arr这个数据已经放到堆上面了，这个放到堆上面的动作一定会发生内存拷贝的
[INFO] [stdout]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_box_arr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/pointer_box/mod.rs:147:9
[INFO] [stdout]     |
[INFO] [stdout] 147 |     let mut n1 = Node {
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `unit`
[INFO] [stdout]   --> src/my_struct.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let unit = Unit;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_unit`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value2`
[INFO] [stdout]    --> src/traits/mod.rs:100:13
[INFO] [stdout]     |
[INFO] [stdout] 100 |         let value2 = 2;
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_value2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s_ref1`
[INFO] [stdout]    --> src/traits/mod.rs:193:9
[INFO] [stdout]     |
[INFO] [stdout] 193 |     let s_ref1 = &jack;
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_s_ref1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s_ref2`
[INFO] [stdout]    --> src/traits/mod.rs:194:9
[INFO] [stdout]     |
[INFO] [stdout] 194 |     let s_ref2 = &jack;
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_s_ref2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/my_type_conversion.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let a = [0u8, 0u8, 0u8, 0u8];
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `box_arr`
[INFO] [stdout]    --> src/pointer_box/mod.rs:105:9
[INFO] [stdout]     |
[INFO] [stdout] 105 |     let box_arr = Box::new(arr); // arr这个数据已经放到堆上面了，这个放到堆上面的动作一定会发生内存拷贝的
[INFO] [stdout]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_box_arr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/pointer_box/mod.rs:147:9
[INFO] [stdout]     |
[INFO] [stdout] 147 |     let mut n1 = Node {
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_guess_number` is never used
[INFO] [stdout]    --> src/main.rs:136:4
[INFO] [stdout]     |
[INFO] [stdout] 136 | fn test_guess_number() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_use_key_words` is never used
[INFO] [stdout]    --> src/main.rs:144:4
[INFO] [stdout]     |
[INFO] [stdout] 144 | fn test_use_key_words() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `divide_by_three` is never used
[INFO] [stdout]   --> src/error/mod.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 |     fn divide_by_three(x: u32) -> u32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `B` is never constructed
[INFO] [stdout]    --> src/expressions.rs:123:9
[INFO] [stdout]     |
[INFO] [stdout] 121 |     enum Alphabet {
[INFO] [stdout]     |          -------- variant in this enum
[INFO] [stdout] 122 |         A,
[INFO] [stdout] 123 |         B,
[INFO] [stdout]     |         ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Alphabet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `B` is never constructed
[INFO] [stdout]    --> src/expressions.rs:151:9
[INFO] [stdout]     |
[INFO] [stdout] 149 |     enum Alphabet1 {
[INFO] [stdout]     |          --------- variant in this enum
[INFO] [stdout] 150 |         A(char),
[INFO] [stdout] 151 |         B,
[INFO] [stdout]     |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `no_return` is never used
[INFO] [stdout]    --> src/function.rs:117:9
[INFO] [stdout]     |
[INFO] [stdout] 117 |      fn no_return() {
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x`, `y`, and `z` are never read
[INFO] [stdout]   --> src/generics/mod.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     struct PointM<T, U> {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 37 |         x: T,
[INFO] [stdout]    |         ^
[INFO] [stdout] 38 |         y: T,
[INFO] [stdout]    |         ^
[INFO] [stdout] 39 |         z: U,
[INFO] [stdout]    |         ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PointM` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/generics/mod.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |     struct Line<T> {
[INFO] [stdout]    |            ---- fields in this struct
[INFO] [stdout] 62 |         x: Point<T>,
[INFO] [stdout]    |         ^
[INFO] [stdout] 63 |         y: Point<T>,
[INFO] [stdout]    |         ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Line` 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 `name` is never read
[INFO] [stdout]   --> src/lifecycle/mod.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     struct PersonM<'a> {
[INFO] [stdout]    |            ------- field in this struct
[INFO] [stdout] 33 |         name: &'a str, // 这是一个引用，引用了一个字符串，字符串本身有自己的生命周期
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PersonM` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Fruit` is never used
[INFO] [stdout]  --> src/my_enum.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 |     enum Fruit {
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Color` is never used
[INFO] [stdout]   --> src/my_enum.rs:14:10
[INFO] [stdout]    |
[INFO] [stdout] 14 |     enum Color {
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `IPv6` is never constructed
[INFO] [stdout]   --> src/my_enum.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     enum IPAddr {
[INFO] [stdout]    |          ------ variant in this enum
[INFO] [stdout] 22 |         IPv4(u8, u8, u8, u8),
[INFO] [stdout] 23 |         IPv6(
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/pointer_box/mod.rs:32:14
[INFO] [stdout]    |
[INFO] [stdout] 32 |         Cons(i32, Box<List>), // 不直接包含List而是存储指向List的地址
[INFO] [stdout]    |         ---- ^^^  ^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         fields in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 32 |         Cons((), ()), // 不直接包含List而是存储指向List的地址
[INFO] [stdout]    |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]   --> src/pointer_box/mod.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     struct Link {
[INFO] [stdout]    |            ---- field in this struct
[INFO] [stdout] 57 |         next: Option<Box<Link>>,
[INFO] [stdout] 58 |         content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Link` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/pointer_box/mod.rs:122:14
[INFO] [stdout]     |
[INFO] [stdout] 122 |         Cons(i32, Rc<ListM>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 122 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `tag` is never read
[INFO] [stdout]    --> src/pointer_box/mod.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 142 |     struct Node {
[INFO] [stdout]     |            ---- field in this struct
[INFO] [stdout] 143 |         children: Rc<RefCell<Vec<Rc<RefCell<Node>>>>>,
[INFO] [stdout] 144 |         tag: String,
[INFO] [stdout]     |         ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `name` is never read
[INFO] [stdout]  --> src/str_type/mod.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct Student {
[INFO] [stdout]   |        ------- field in this struct
[INFO] [stdout] 7 |     name: String,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Student` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `show` is never used
[INFO] [stdout]   --> src/traits/mod.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn show<T: std::fmt::Display>(a: T) {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `age` is never read
[INFO] [stdout]    --> src/traits/mod.rs:170:9
[INFO] [stdout]     |
[INFO] [stdout] 168 |     struct Person<T, U> {
[INFO] [stdout]     |            ------ field in this struct
[INFO] [stdout] 169 |         name: T,
[INFO] [stdout] 170 |         age: U,
[INFO] [stdout]     |         ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Person` 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: `value2`
[INFO] [stdout]    --> src/traits/mod.rs:100:13
[INFO] [stdout]     |
[INFO] [stdout] 100 |         let value2 = 2;
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_value2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s_ref1`
[INFO] [stdout]    --> src/traits/mod.rs:193:9
[INFO] [stdout]     |
[INFO] [stdout] 193 |     let s_ref1 = &jack;
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_s_ref1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s_ref2`
[INFO] [stdout]    --> src/traits/mod.rs:194:9
[INFO] [stdout]     |
[INFO] [stdout] 194 |     let s_ref2 = &jack;
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_s_ref2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:169:5
[INFO] [stdout]     |
[INFO] [stdout] 169 |     pointer_box::pointer_box();
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 169 |     let _ = pointer_box::pointer_box();
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:181:5
[INFO] [stdout]     |
[INFO] [stdout] 181 |     str_type::str_type();
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 181 |     let _ = str_type::str_type();
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/function.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 62 | /     thread::spawn(move || {
[INFO] [stdout] 63 | |         println!("{}", hello_message);
[INFO] [stdout] 64 | |     })
[INFO] [stdout] 65 | |     .join(); // join 除非子线程退出，不然主线程会一直去等待
[INFO] [stdout]    | |___________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 62 |     let _ = thread::spawn(move || {
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_guess_number` is never used
[INFO] [stdout]    --> src/main.rs:136:4
[INFO] [stdout]     |
[INFO] [stdout] 136 | fn test_guess_number() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_use_key_words` is never used
[INFO] [stdout]    --> src/main.rs:144:4
[INFO] [stdout]     |
[INFO] [stdout] 144 | fn test_use_key_words() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `divide_by_three` is never used
[INFO] [stdout]   --> src/error/mod.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 |     fn divide_by_three(x: u32) -> u32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `B` is never constructed
[INFO] [stdout]    --> src/expressions.rs:123:9
[INFO] [stdout]     |
[INFO] [stdout] 121 |     enum Alphabet {
[INFO] [stdout]     |          -------- variant in this enum
[INFO] [stdout] 122 |         A,
[INFO] [stdout] 123 |         B,
[INFO] [stdout]     |         ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Alphabet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `B` is never constructed
[INFO] [stdout]    --> src/expressions.rs:151:9
[INFO] [stdout]     |
[INFO] [stdout] 149 |     enum Alphabet1 {
[INFO] [stdout]     |          --------- variant in this enum
[INFO] [stdout] 150 |         A(char),
[INFO] [stdout] 151 |         B,
[INFO] [stdout]     |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `no_return` is never used
[INFO] [stdout]    --> src/function.rs:117:9
[INFO] [stdout]     |
[INFO] [stdout] 117 |      fn no_return() {
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x`, `y`, and `z` are never read
[INFO] [stdout]   --> src/generics/mod.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     struct PointM<T, U> {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 37 |         x: T,
[INFO] [stdout]    |         ^
[INFO] [stdout] 38 |         y: T,
[INFO] [stdout]    |         ^
[INFO] [stdout] 39 |         z: U,
[INFO] [stdout]    |         ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PointM` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/generics/mod.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |     struct Line<T> {
[INFO] [stdout]    |            ---- fields in this struct
[INFO] [stdout] 62 |         x: Point<T>,
[INFO] [stdout]    |         ^
[INFO] [stdout] 63 |         y: Point<T>,
[INFO] [stdout]    |         ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Line` 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 `name` is never read
[INFO] [stdout]   --> src/lifecycle/mod.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     struct PersonM<'a> {
[INFO] [stdout]    |            ------- field in this struct
[INFO] [stdout] 33 |         name: &'a str, // 这是一个引用，引用了一个字符串，字符串本身有自己的生命周期
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PersonM` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Fruit` is never used
[INFO] [stdout]  --> src/my_enum.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 |     enum Fruit {
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Color` is never used
[INFO] [stdout]   --> src/my_enum.rs:14:10
[INFO] [stdout]    |
[INFO] [stdout] 14 |     enum Color {
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `IPv6` is never constructed
[INFO] [stdout]   --> src/my_enum.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     enum IPAddr {
[INFO] [stdout]    |          ------ variant in this enum
[INFO] [stdout] 22 |         IPv4(u8, u8, u8, u8),
[INFO] [stdout] 23 |         IPv6(
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/pointer_box/mod.rs:32:14
[INFO] [stdout]    |
[INFO] [stdout] 32 |         Cons(i32, Box<List>), // 不直接包含List而是存储指向List的地址
[INFO] [stdout]    |         ---- ^^^  ^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         fields in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 32 |         Cons((), ()), // 不直接包含List而是存储指向List的地址
[INFO] [stdout]    |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]   --> src/pointer_box/mod.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     struct Link {
[INFO] [stdout]    |            ---- field in this struct
[INFO] [stdout] 57 |         next: Option<Box<Link>>,
[INFO] [stdout] 58 |         content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Link` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/pointer_box/mod.rs:122:14
[INFO] [stdout]     |
[INFO] [stdout] 122 |         Cons(i32, Rc<ListM>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 122 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `tag` is never read
[INFO] [stdout]    --> src/pointer_box/mod.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 142 |     struct Node {
[INFO] [stdout]     |            ---- field in this struct
[INFO] [stdout] 143 |         children: Rc<RefCell<Vec<Rc<RefCell<Node>>>>>,
[INFO] [stdout] 144 |         tag: String,
[INFO] [stdout]     |         ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `name` is never read
[INFO] [stdout]  --> src/str_type/mod.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct Student {
[INFO] [stdout]   |        ------- field in this struct
[INFO] [stdout] 7 |     name: String,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Student` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `show` is never used
[INFO] [stdout]   --> src/traits/mod.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn show<T: std::fmt::Display>(a: T) {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `age` is never read
[INFO] [stdout]    --> src/traits/mod.rs:170:9
[INFO] [stdout]     |
[INFO] [stdout] 168 |     struct Person<T, U> {
[INFO] [stdout]     |            ------ field in this struct
[INFO] [stdout] 169 |         name: T,
[INFO] [stdout] 170 |         age: U,
[INFO] [stdout]     |         ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Person` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 37 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:169:5
[INFO] [stdout]     |
[INFO] [stdout] 169 |     pointer_box::pointer_box();
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 169 |     let _ = pointer_box::pointer_box();
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:181:5
[INFO] [stdout]     |
[INFO] [stdout] 181 |     str_type::str_type();
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 181 |     let _ = str_type::str_type();
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/function.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 62 | /     thread::spawn(move || {
[INFO] [stdout] 63 | |         println!("{}", hello_message);
[INFO] [stdout] 64 | |     })
[INFO] [stdout] 65 | |     .join(); // join 除非子线程退出，不然主线程会一直去等待
[INFO] [stdout]    | |___________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 62 |     let _ = thread::spawn(move || {
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 37 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.67s
[INFO] running `Command { std: "docker" "inspect" "b13f5ff6bc2bdcb8d125469b15202fa32c3203a552f303e9e8ad81bbb5ffda16", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b13f5ff6bc2bdcb8d125469b15202fa32c3203a552f303e9e8ad81bbb5ffda16", kill_on_drop: false }`
[INFO] [stdout] b13f5ff6bc2bdcb8d125469b15202fa32c3203a552f303e9e8ad81bbb5ffda16