[INFO] cloning repository https://github.com/breakinferno/learn-rust-demo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/breakinferno/learn-rust-demo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbreakinferno%2Flearn-rust-demo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbreakinferno%2Flearn-rust-demo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 120c62dcfed0a2c273a142b22b81158cadc8377f
[INFO] testing breakinferno/learn-rust-demo against beta-2025-09-21 for beta-1.91-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbreakinferno%2Flearn-rust-demo" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/breakinferno/learn-rust-demo
[INFO] finished tweaking git repo https://github.com/breakinferno/learn-rust-demo
[INFO] tweaked toml for git repo https://github.com/breakinferno/learn-rust-demo written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/breakinferno/learn-rust-demo on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/breakinferno/learn-rust-demo 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" "+beta-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f3fc6bad03796182f039d389e388c274c9326966c6d8827bd2dc547b498e7f9d
[INFO] running `Command { std: "docker" "start" "-a" "f3fc6bad03796182f039d389e388c274c9326966c6d8827bd2dc547b498e7f9d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f3fc6bad03796182f039d389e388c274c9326966c6d8827bd2dc547b498e7f9d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f3fc6bad03796182f039d389e388c274c9326966c6d8827bd2dc547b498e7f9d", kill_on_drop: false }`
[INFO] [stdout] f3fc6bad03796182f039d389e388c274c9326966c6d8827bd2dc547b498e7f9d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] aa3ee05bef693c5c620972e79f62cff2ba2681163537d5a27eec08fb9857a864
[INFO] running `Command { std: "docker" "start" "-a" "aa3ee05bef693c5c620972e79f62cff2ba2681163537d5a27eec08fb9857a864", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.60
[INFO] [stderr]    Compiling unicode-ident v1.0.9
[INFO] [stderr]    Compiling quote v1.0.28
[INFO] [stderr]    Compiling syn v2.0.18
[INFO] [stderr]    Compiling macro_define_crate v0.1.0 (/opt/rustwide/workdir/macro_define_crate)
[INFO] [stdout] warning: unused imports: `Attribute` and `parse_macro_input`
[INFO] [stdout]  --> macro_define_crate/src/lib.rs:2:11
[INFO] [stdout]   |
[INFO] [stdout] 2 | use syn::{parse_macro_input, Attribute};
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^^^  ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling learn v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant `b` should have an upper camel case name
[INFO] [stdout]    --> src/main.rs:159:5
[INFO] [stdout]     |
[INFO] [stdout] 159 |     b(i32),
[INFO] [stdout]     |     ^ help: convert the identifier to upper camel case: `B`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_camel_case_types)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]   --> src/mytrait.rs:47:34
[INFO] [stdout]    |
[INFO] [stdout] 47 | pub fn notify_multi_trait_return(item: impl Summary + Display) -> impl Summary {
[INFO] [stdout]    |                                  ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]   --> src/mytrait.rs:43:27
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub fn notify_multi_trait(item: impl Summary + Display) {
[INFO] [stdout]    |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]   --> src/mytrait.rs:52:56
[INFO] [stdout]    |
[INFO] [stdout] 52 | pub fn notify_multi_trait_bounds<T: Summary + Display>(item: T) {
[INFO] [stdout]    |                                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]   --> src/mytrait.rs:56:46
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn notify_multi_trait_bounds_where<T, U>(item: T, key: U) 
[INFO] [stdout]    |                                              ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]   --> src/mytrait.rs:56:55
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn notify_multi_trait_bounds_where<T, U>(item: T, key: U) 
[INFO] [stdout]    |                                                       ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/lifecycle.rs:14:28
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn largest<'a>(a: &'a i32, b: &'a i32) -> &'a i32 { // 声明了一个声明周期，跟泛型一样，泛型式声明了一个类型。
[INFO] [stdout]    |                            ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arg`
[INFO] [stdout]   --> src/lifecycle.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |     fn life(arg: &'a str) -> &'a str {
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_arg`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/lifecycle.rs:33:53
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn test_dep_life<'a: 'b, 'b: 'c, 'c>(a: &'a String, b: &'b String) -> &'c String {
[INFO] [stdout]    |                                                     ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/lifecycle.rs:37:45
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn difficult<'a, T>(x: &'a str, y: &'a str, z: T) -> &'a str
[INFO] [stdout]    |                                             ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `x` is assigned to, but never used
[INFO] [stdout]   --> src/closure.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let mut x = add(5,7);
[INFO] [stdout]    |             ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_x` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> src/closure.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     x = bo(5,7);
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list_of_statues`
[INFO] [stdout]   --> src/closure.rs:90:9
[INFO] [stdout]    |
[INFO] [stdout] 90 |     let list_of_statues: Vec<Status> = (0u32..20).map(Status::Value).collect();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_list_of_statues`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]    --> src/main.rs:115:9
[INFO] [stdout]     |
[INFO] [stdout] 115 |     let d = demod::Demo {x:2};
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |     let mut st2 = "字符串字面值".to_string();
[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: field `0` is never read
[INFO] [stdout]   --> src/main.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     Int(i32),
[INFO] [stdout]    |     --- ^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SheetCell` 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] 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 -     Int(i32),
[INFO] [stdout] 17 +     Int(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:18:11
[INFO] [stdout]    |
[INFO] [stdout] 18 |     Float(f64),
[INFO] [stdout]    |     ----- ^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SheetCell` 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] 18 -     Float(f64),
[INFO] [stdout] 18 +     Float(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:19:10
[INFO] [stdout]    |
[INFO] [stdout] 19 |     Text(String),
[INFO] [stdout]    |     ---- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SheetCell` 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] 19 -     Text(String),
[INFO] [stdout] 19 +     Text(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `y` is never read
[INFO] [stdout]    --> src/main.rs:124:5
[INFO] [stdout]     |
[INFO] [stdout] 122 | struct Point<T, U> {
[INFO] [stdout]     |        ----- field in this struct
[INFO] [stdout] 123 |     x: T,
[INFO] [stdout] 124 |     y: U
[INFO] [stdout]     |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `y` is never used
[INFO] [stdout]    --> src/main.rs:131:8
[INFO] [stdout]     |
[INFO] [stdout] 127 | impl<T, U> Point<T, U> {// 针对类型T U实现方法
[INFO] [stdout]     | ---------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 131 |     fn y(&self) -> &U {
[INFO] [stdout]     |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `cmp_display` is never used
[INFO] [stdout]    --> src/main.rs:143:8
[INFO] [stdout]     |
[INFO] [stdout] 142 | impl<T: Display + PartialOrd, U> Point<T, U> {
[INFO] [stdout]     | -------------------------------------------- method in this implementation
[INFO] [stdout] 143 |     fn cmp_display(&self) {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `MyEnum` is never used
[INFO] [stdout]    --> src/main.rs:157:6
[INFO] [stdout]     |
[INFO] [stdout] 157 | enum MyEnum<T> {
[INFO] [stdout]     |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_open_file` is never used
[INFO] [stdout]    --> src/main.rs:166:4
[INFO] [stdout]     |
[INFO] [stdout] 166 | fn test_open_file() -> Result<String, io::Error> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify` is never used
[INFO] [stdout]   --> src/mytrait.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | pub fn notify(item: impl Summary, item2: impl Summary) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_trait_bounds` is never used
[INFO] [stdout]   --> src/mytrait.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | pub fn notify_trait_bounds<T: Summary>(item: T, item2: T) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_multi_trait` is never used
[INFO] [stdout]   --> src/mytrait.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub fn notify_multi_trait(item: impl Summary + Display) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_multi_trait_return` is never used
[INFO] [stdout]   --> src/mytrait.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | pub fn notify_multi_trait_return(item: impl Summary + Display) -> impl Summary {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_multi_trait_bounds` is never used
[INFO] [stdout]   --> src/mytrait.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | pub fn notify_multi_trait_bounds<T: Summary + Display>(item: T) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_multi_trait_bounds_where` is never used
[INFO] [stdout]   --> src/mytrait.rs:56:8
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn notify_multi_trait_bounds_where<T, U>(item: T, key: U) 
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `x` is never read
[INFO] [stdout]  --> src/demod/demo.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Demo {
[INFO] [stdout]   |            ---- field in this struct
[INFO] [stdout] 2 |     pub x: i32
[INFO] [stdout]   |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Lifecycle` is never constructed
[INFO] [stdout]  --> src/lifecycle.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Lifecycle<'a> {
[INFO] [stdout]   |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest` is never used
[INFO] [stdout]   --> src/lifecycle.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn largest<'a>(a: &'a i32, b: &'a i32) -> &'a i32 { // 声明了一个声明周期，跟泛型一样，泛型式声明了一个类型。
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `life`, `method_no_omit_lifecycle`, and `method` are never used
[INFO] [stdout]   --> src/lifecycle.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl<'a> Lifecycle<'a> {
[INFO] [stdout]    | ---------------------- associated items in this implementation
[INFO] [stdout] 19 |     fn life(arg: &'a str) -> &'a str {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 23 |     fn method_no_omit_lifecycle(&'a self) -> i32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     fn method(&self) -> i32 {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_dep_life` is never used
[INFO] [stdout]   --> src/lifecycle.rs:33:4
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn test_dep_life<'a: 'b, 'b: 'c, 'c>(a: &'a String, b: &'b String) -> &'c String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `difficult` is never used
[INFO] [stdout]   --> src/lifecycle.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn difficult<'a, T>(x: &'a str, y: &'a str, z: T) -> &'a str
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_closure` is never used
[INFO] [stdout]  --> src/closure.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn test_closure() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add` is never used
[INFO] [stdout]  --> src/closure.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn add(x: i32, y: i32) -> i32 {
[INFO] [stdout]   |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_fn_pointer` is never used
[INFO] [stdout]   --> src/closure.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn test_fn_pointer() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cache` is never constructed
[INFO] [stdout]   --> src/closure.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct  Cache<T>
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `value` are never used
[INFO] [stdout]   --> src/closure.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 31 | / impl<T> Cache<T>
[INFO] [stdout] 32 | | where
[INFO] [stdout] 33 | |     T: Fn(i32) -> i32,
[INFO] [stdout]    | |______________________- associated items in this implementation
[INFO] [stdout] 34 |   {
[INFO] [stdout] 35 |       fn new(method: T) -> Cache<T> {
[INFO] [stdout]    |          ^^^
[INFO] [stdout] ...
[INFO] [stdout] 42 |       fn value(&mut self, arg: i32) -> i32 {
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_once` is never used
[INFO] [stdout]   --> src/closure.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn add_once(x: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `do_more` is never used
[INFO] [stdout]   --> src/closure.rs:59:4
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn do_more(f: fn(i32) -> i32, arg: i32) -> i32 { // fn 表示函数指针类型
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `do_twice` is never used
[INFO] [stdout]   --> src/closure.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn do_twice<T>(f: T, arg: i32) -> i32
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Status` is never used
[INFO] [stdout]   --> src/closure.rs:70:6
[INFO] [stdout]    |
[INFO] [stdout] 70 | enum Status {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `return_closure` is never used
[INFO] [stdout]   --> src/closure.rs:75:4
[INFO] [stdout]    |
[INFO] [stdout] 75 | fn return_closure() -> impl Fn(i32) -> i32 { // 返回闭包需要闭包特征
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `return_closure_pro` is never used
[INFO] [stdout]   --> src/closure.rs:79:4
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn return_closure_pro(a: i32) -> Box<dyn Fn(i32) -> i32> { // 返回闭包需要闭包特征
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test` is never used
[INFO] [stdout]   --> src/closure.rs:87:4
[INFO] [stdout]    |
[INFO] [stdout] 87 | fn test() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]   --> src/main.rs:52:5
[INFO] [stdout]    |
[INFO] [stdout] 52 |     st2 + &st3;
[INFO] [stdout]    |     ^^^^^^^^^^ the arithmetic operation produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let _ = st2 + &st3;
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.42s
[INFO] running `Command { std: "docker" "inspect" "aa3ee05bef693c5c620972e79f62cff2ba2681163537d5a27eec08fb9857a864", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa3ee05bef693c5c620972e79f62cff2ba2681163537d5a27eec08fb9857a864", kill_on_drop: false }`
[INFO] [stdout] aa3ee05bef693c5c620972e79f62cff2ba2681163537d5a27eec08fb9857a864
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8128c2ecf40eab4f905b64216eeb8e607099d506ef9099c1cf06ff7beeacfc5c
[INFO] running `Command { std: "docker" "start" "-a" "8128c2ecf40eab4f905b64216eeb8e607099d506ef9099c1cf06ff7beeacfc5c", kill_on_drop: false }`
[INFO] [stderr]    Compiling learn v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Attribute` and `parse_macro_input`
[INFO] [stdout]  --> macro_define_crate/src/lib.rs:2:11
[INFO] [stdout]   |
[INFO] [stdout] 2 | use syn::{parse_macro_input, Attribute};
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^^^  ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `b` should have an upper camel case name
[INFO] [stdout]    --> src/main.rs:159:5
[INFO] [stdout]     |
[INFO] [stdout] 159 |     b(i32),
[INFO] [stdout]     |     ^ help: convert the identifier to upper camel case: `B`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_camel_case_types)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]   --> src/mytrait.rs:47:34
[INFO] [stdout]    |
[INFO] [stdout] 47 | pub fn notify_multi_trait_return(item: impl Summary + Display) -> impl Summary {
[INFO] [stdout]    |                                  ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]   --> src/mytrait.rs:43:27
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub fn notify_multi_trait(item: impl Summary + Display) {
[INFO] [stdout]    |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]   --> src/mytrait.rs:52:56
[INFO] [stdout]    |
[INFO] [stdout] 52 | pub fn notify_multi_trait_bounds<T: Summary + Display>(item: T) {
[INFO] [stdout]    |                                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]   --> src/mytrait.rs:56:46
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn notify_multi_trait_bounds_where<T, U>(item: T, key: U) 
[INFO] [stdout]    |                                              ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]   --> src/mytrait.rs:56:55
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn notify_multi_trait_bounds_where<T, U>(item: T, key: U) 
[INFO] [stdout]    |                                                       ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/lifecycle.rs:14:28
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn largest<'a>(a: &'a i32, b: &'a i32) -> &'a i32 { // 声明了一个声明周期，跟泛型一样，泛型式声明了一个类型。
[INFO] [stdout]    |                            ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arg`
[INFO] [stdout]   --> src/lifecycle.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |     fn life(arg: &'a str) -> &'a str {
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_arg`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/lifecycle.rs:33:53
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn test_dep_life<'a: 'b, 'b: 'c, 'c>(a: &'a String, b: &'b String) -> &'c String {
[INFO] [stdout]    |                                                     ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/lifecycle.rs:37:45
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn difficult<'a, T>(x: &'a str, y: &'a str, z: T) -> &'a str
[INFO] [stdout]    |                                             ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `x` is assigned to, but never used
[INFO] [stdout]   --> src/closure.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let mut x = add(5,7);
[INFO] [stdout]    |             ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_x` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> src/closure.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     x = bo(5,7);
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list_of_statues`
[INFO] [stdout]   --> src/closure.rs:90:9
[INFO] [stdout]    |
[INFO] [stdout] 90 |     let list_of_statues: Vec<Status> = (0u32..20).map(Status::Value).collect();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_list_of_statues`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]    --> src/main.rs:115:9
[INFO] [stdout]     |
[INFO] [stdout] 115 |     let d = demod::Demo {x:2};
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |     let mut st2 = "字符串字面值".to_string();
[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: field `0` is never read
[INFO] [stdout]   --> src/main.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     Int(i32),
[INFO] [stdout]    |     --- ^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SheetCell` 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] 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 -     Int(i32),
[INFO] [stdout] 17 +     Int(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:18:11
[INFO] [stdout]    |
[INFO] [stdout] 18 |     Float(f64),
[INFO] [stdout]    |     ----- ^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SheetCell` 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] 18 -     Float(f64),
[INFO] [stdout] 18 +     Float(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:19:10
[INFO] [stdout]    |
[INFO] [stdout] 19 |     Text(String),
[INFO] [stdout]    |     ---- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SheetCell` 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] 19 -     Text(String),
[INFO] [stdout] 19 +     Text(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `y` is never read
[INFO] [stdout]    --> src/main.rs:124:5
[INFO] [stdout]     |
[INFO] [stdout] 122 | struct Point<T, U> {
[INFO] [stdout]     |        ----- field in this struct
[INFO] [stdout] 123 |     x: T,
[INFO] [stdout] 124 |     y: U
[INFO] [stdout]     |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `y` is never used
[INFO] [stdout]    --> src/main.rs:131:8
[INFO] [stdout]     |
[INFO] [stdout] 127 | impl<T, U> Point<T, U> {// 针对类型T U实现方法
[INFO] [stdout]     | ---------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 131 |     fn y(&self) -> &U {
[INFO] [stdout]     |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `cmp_display` is never used
[INFO] [stdout]    --> src/main.rs:143:8
[INFO] [stdout]     |
[INFO] [stdout] 142 | impl<T: Display + PartialOrd, U> Point<T, U> {
[INFO] [stdout]     | -------------------------------------------- method in this implementation
[INFO] [stdout] 143 |     fn cmp_display(&self) {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `MyEnum` is never used
[INFO] [stdout]    --> src/main.rs:157:6
[INFO] [stdout]     |
[INFO] [stdout] 157 | enum MyEnum<T> {
[INFO] [stdout]     |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_open_file` is never used
[INFO] [stdout]    --> src/main.rs:166:4
[INFO] [stdout]     |
[INFO] [stdout] 166 | fn test_open_file() -> Result<String, io::Error> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify` is never used
[INFO] [stdout]   --> src/mytrait.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | pub fn notify(item: impl Summary, item2: impl Summary) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_trait_bounds` is never used
[INFO] [stdout]   --> src/mytrait.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | pub fn notify_trait_bounds<T: Summary>(item: T, item2: T) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_multi_trait` is never used
[INFO] [stdout]   --> src/mytrait.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub fn notify_multi_trait(item: impl Summary + Display) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_multi_trait_return` is never used
[INFO] [stdout]   --> src/mytrait.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | pub fn notify_multi_trait_return(item: impl Summary + Display) -> impl Summary {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_multi_trait_bounds` is never used
[INFO] [stdout]   --> src/mytrait.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | pub fn notify_multi_trait_bounds<T: Summary + Display>(item: T) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_multi_trait_bounds_where` is never used
[INFO] [stdout]   --> src/mytrait.rs:56:8
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn notify_multi_trait_bounds_where<T, U>(item: T, key: U) 
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `x` is never read
[INFO] [stdout]  --> src/demod/demo.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Demo {
[INFO] [stdout]   |            ---- field in this struct
[INFO] [stdout] 2 |     pub x: i32
[INFO] [stdout]   |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Lifecycle` is never constructed
[INFO] [stdout]  --> src/lifecycle.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Lifecycle<'a> {
[INFO] [stdout]   |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest` is never used
[INFO] [stdout]   --> src/lifecycle.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn largest<'a>(a: &'a i32, b: &'a i32) -> &'a i32 { // 声明了一个声明周期，跟泛型一样，泛型式声明了一个类型。
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `life`, `method_no_omit_lifecycle`, and `method` are never used
[INFO] [stdout]   --> src/lifecycle.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl<'a> Lifecycle<'a> {
[INFO] [stdout]    | ---------------------- associated items in this implementation
[INFO] [stdout] 19 |     fn life(arg: &'a str) -> &'a str {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 23 |     fn method_no_omit_lifecycle(&'a self) -> i32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     fn method(&self) -> i32 {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_dep_life` is never used
[INFO] [stdout]   --> src/lifecycle.rs:33:4
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn test_dep_life<'a: 'b, 'b: 'c, 'c>(a: &'a String, b: &'b String) -> &'c String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `difficult` is never used
[INFO] [stdout]   --> src/lifecycle.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn difficult<'a, T>(x: &'a str, y: &'a str, z: T) -> &'a str
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_closure` is never used
[INFO] [stdout]  --> src/closure.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn test_closure() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add` is never used
[INFO] [stdout]  --> src/closure.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn add(x: i32, y: i32) -> i32 {
[INFO] [stdout]   |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_fn_pointer` is never used
[INFO] [stdout]   --> src/closure.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn test_fn_pointer() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cache` is never constructed
[INFO] [stdout]   --> src/closure.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct  Cache<T>
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `value` are never used
[INFO] [stdout]   --> src/closure.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 31 | / impl<T> Cache<T>
[INFO] [stdout] 32 | | where
[INFO] [stdout] 33 | |     T: Fn(i32) -> i32,
[INFO] [stdout]    | |______________________- associated items in this implementation
[INFO] [stdout] 34 |   {
[INFO] [stdout] 35 |       fn new(method: T) -> Cache<T> {
[INFO] [stdout]    |          ^^^
[INFO] [stdout] ...
[INFO] [stdout] 42 |       fn value(&mut self, arg: i32) -> i32 {
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_once` is never used
[INFO] [stdout]   --> src/closure.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn add_once(x: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `do_more` is never used
[INFO] [stdout]   --> src/closure.rs:59:4
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn do_more(f: fn(i32) -> i32, arg: i32) -> i32 { // fn 表示函数指针类型
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `do_twice` is never used
[INFO] [stdout]   --> src/closure.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn do_twice<T>(f: T, arg: i32) -> i32
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Status` is never used
[INFO] [stdout]   --> src/closure.rs:70:6
[INFO] [stdout]    |
[INFO] [stdout] 70 | enum Status {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `return_closure` is never used
[INFO] [stdout]   --> src/closure.rs:75:4
[INFO] [stdout]    |
[INFO] [stdout] 75 | fn return_closure() -> impl Fn(i32) -> i32 { // 返回闭包需要闭包特征
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `return_closure_pro` is never used
[INFO] [stdout]   --> src/closure.rs:79:4
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn return_closure_pro(a: i32) -> Box<dyn Fn(i32) -> i32> { // 返回闭包需要闭包特征
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test` is never used
[INFO] [stdout]   --> src/closure.rs:87:4
[INFO] [stdout]    |
[INFO] [stdout] 87 | fn test() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]   --> src/main.rs:52:5
[INFO] [stdout]    |
[INFO] [stdout] 52 |     st2 + &st3;
[INFO] [stdout]    |     ^^^^^^^^^^ the arithmetic operation produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let _ = st2 + &st3;
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.81s
[INFO] running `Command { std: "docker" "inspect" "8128c2ecf40eab4f905b64216eeb8e607099d506ef9099c1cf06ff7beeacfc5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8128c2ecf40eab4f905b64216eeb8e607099d506ef9099c1cf06ff7beeacfc5c", kill_on_drop: false }`
[INFO] [stdout] 8128c2ecf40eab4f905b64216eeb8e607099d506ef9099c1cf06ff7beeacfc5c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 7ec8e35059d260f97e1eb4d2c7d7e0a2cb004bbba156b74a8449df9d342fbe7e
[INFO] running `Command { std: "docker" "start" "-a" "7ec8e35059d260f97e1eb4d2c7d7e0a2cb004bbba156b74a8449df9d342fbe7e", kill_on_drop: false }`
[INFO] [stderr] warning: unused imports: `Attribute` and `parse_macro_input`
[INFO] [stderr]  --> macro_define_crate/src/lib.rs:2:11
[INFO] [stderr]   |
[INFO] [stderr] 2 | use syn::{parse_macro_input, Attribute};
[INFO] [stderr]   |           ^^^^^^^^^^^^^^^^^  ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `macro_define_crate` (lib) generated 1 warning (run `cargo fix --lib -p macro_define_crate` to apply 1 suggestion)
[INFO] [stderr] warning: variant `b` should have an upper camel case name
[INFO] [stderr]    --> src/main.rs:159:5
[INFO] [stderr]     |
[INFO] [stderr] 159 |     b(i32),
[INFO] [stderr]     |     ^ help: convert the identifier to upper camel case: `B`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(non_camel_case_types)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `item`
[INFO] [stderr]   --> src/mytrait.rs:47:34
[INFO] [stderr]    |
[INFO] [stderr] 47 | pub fn notify_multi_trait_return(item: impl Summary + Display) -> impl Summary {
[INFO] [stderr]    |                                  ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `item`
[INFO] [stderr]   --> src/mytrait.rs:43:27
[INFO] [stderr]    |
[INFO] [stderr] 43 | pub fn notify_multi_trait(item: impl Summary + Display) {
[INFO] [stderr]    |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `item`
[INFO] [stderr]   --> src/mytrait.rs:52:56
[INFO] [stderr]    |
[INFO] [stderr] 52 | pub fn notify_multi_trait_bounds<T: Summary + Display>(item: T) {
[INFO] [stderr]    |                                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `item`
[INFO] [stderr]   --> src/mytrait.rs:56:46
[INFO] [stderr]    |
[INFO] [stderr] 56 | pub fn notify_multi_trait_bounds_where<T, U>(item: T, key: U) 
[INFO] [stderr]    |                                              ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `key`
[INFO] [stderr]   --> src/mytrait.rs:56:55
[INFO] [stderr]    |
[INFO] [stderr] 56 | pub fn notify_multi_trait_bounds_where<T, U>(item: T, key: U) 
[INFO] [stderr]    |                                                       ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]   --> src/lifecycle.rs:14:28
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn largest<'a>(a: &'a i32, b: &'a i32) -> &'a i32 { // 声明了一个声明周期，跟泛型一样，泛型式声明了一个类型。
[INFO] [stderr]    |                            ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `arg`
[INFO] [stderr]   --> src/lifecycle.rs:19:13
[INFO] [stderr]    |
[INFO] [stderr] 19 |     fn life(arg: &'a str) -> &'a str {
[INFO] [stderr]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_arg`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]   --> src/lifecycle.rs:33:53
[INFO] [stderr]    |
[INFO] [stderr] 33 | fn test_dep_life<'a: 'b, 'b: 'c, 'c>(a: &'a String, b: &'b String) -> &'c String {
[INFO] [stderr]    |                                                     ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `z`
[INFO] [stderr]   --> src/lifecycle.rs:37:45
[INFO] [stderr]    |
[INFO] [stderr] 37 | fn difficult<'a, T>(x: &'a str, y: &'a str, z: T) -> &'a str
[INFO] [stderr]    |                                             ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `x` is assigned to, but never used
[INFO] [stderr]   --> src/closure.rs:13:13
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let mut x = add(5,7);
[INFO] [stderr]    |             ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_x` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `x` is never read
[INFO] [stderr]   --> src/closure.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     x = bo(5,7);
[INFO] [stderr]    |     ^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `list_of_statues`
[INFO] [stderr]   --> src/closure.rs:90:9
[INFO] [stderr]    |
[INFO] [stderr] 90 |     let list_of_statues: Vec<Status> = (0u32..20).map(Status::Value).collect();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_list_of_statues`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `d`
[INFO] [stderr]    --> src/main.rs:115:9
[INFO] [stderr]     |
[INFO] [stderr] 115 |     let d = demod::Demo {x:2};
[INFO] [stderr]     |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:49:9
[INFO] [stderr]    |
[INFO] [stderr] 49 |     let mut st2 = "字符串字面值".to_string();
[INFO] [stderr]    |         ----^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/main.rs:17:9
[INFO] [stderr]    |
[INFO] [stderr] 17 |     Int(i32),
[INFO] [stderr]    |     --- ^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `SheetCell` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 17 -     Int(i32),
[INFO] [stderr] 17 +     Int(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/main.rs:18:11
[INFO] [stderr]    |
[INFO] [stderr] 18 |     Float(f64),
[INFO] [stderr]    |     ----- ^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `SheetCell` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 18 -     Float(f64),
[INFO] [stderr] 18 +     Float(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/main.rs:19:10
[INFO] [stderr]    |
[INFO] [stderr] 19 |     Text(String),
[INFO] [stderr]    |     ---- ^^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `SheetCell` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 19 -     Text(String),
[INFO] [stderr] 19 +     Text(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: field `y` is never read
[INFO] [stderr]    --> src/main.rs:124:5
[INFO] [stderr]     |
[INFO] [stderr] 122 | struct Point<T, U> {
[INFO] [stderr]     |        ----- field in this struct
[INFO] [stderr] 123 |     x: T,
[INFO] [stderr] 124 |     y: U
[INFO] [stderr]     |     ^
[INFO] [stderr] 
[INFO] [stderr] warning: method `y` is never used
[INFO] [stderr]    --> src/main.rs:131:8
[INFO] [stderr]     |
[INFO] [stderr] 127 | impl<T, U> Point<T, U> {// 针对类型T U实现方法
[INFO] [stderr]     | ---------------------- method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 131 |     fn y(&self) -> &U {
[INFO] [stderr]     |        ^
[INFO] [stderr] 
[INFO] [stderr] warning: method `cmp_display` is never used
[INFO] [stderr]    --> src/main.rs:143:8
[INFO] [stderr]     |
[INFO] [stderr] 142 | impl<T: Display + PartialOrd, U> Point<T, U> {
[INFO] [stderr]     | -------------------------------------------- method in this implementation
[INFO] [stderr] 143 |     fn cmp_display(&self) {
[INFO] [stderr]     |        ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `MyEnum` is never used
[INFO] [stderr]    --> src/main.rs:157:6
[INFO] [stderr]     |
[INFO] [stderr] 157 | enum MyEnum<T> {
[INFO] [stderr]     |      ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `test_open_file` is never used
[INFO] [stderr]    --> src/main.rs:166:4
[INFO] [stderr]     |
[INFO] [stderr] 166 | fn test_open_file() -> Result<String, io::Error> {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `notify` is never used
[INFO] [stderr]   --> src/mytrait.rs:33:8
[INFO] [stderr]    |
[INFO] [stderr] 33 | pub fn notify(item: impl Summary, item2: impl Summary) {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `notify_trait_bounds` is never used
[INFO] [stderr]   --> src/mytrait.rs:38:8
[INFO] [stderr]    |
[INFO] [stderr] 38 | pub fn notify_trait_bounds<T: Summary>(item: T, item2: T) {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `notify_multi_trait` is never used
[INFO] [stderr]   --> src/mytrait.rs:43:8
[INFO] [stderr]    |
[INFO] [stderr] 43 | pub fn notify_multi_trait(item: impl Summary + Display) {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `notify_multi_trait_return` is never used
[INFO] [stderr]   --> src/mytrait.rs:47:8
[INFO] [stderr]    |
[INFO] [stderr] 47 | pub fn notify_multi_trait_return(item: impl Summary + Display) -> impl Summary {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `notify_multi_trait_bounds` is never used
[INFO] [stderr]   --> src/mytrait.rs:52:8
[INFO] [stderr]    |
[INFO] [stderr] 52 | pub fn notify_multi_trait_bounds<T: Summary + Display>(item: T) {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `notify_multi_trait_bounds_where` is never used
[INFO] [stderr]   --> src/mytrait.rs:56:8
[INFO] [stderr]    |
[INFO] [stderr] 56 | pub fn notify_multi_trait_bounds_where<T, U>(item: T, key: U) 
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field `x` is never read
[INFO] [stderr]  --> src/demod/demo.rs:2:9
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub struct Demo {
[INFO] [stderr]   |            ---- field in this struct
[INFO] [stderr] 2 |     pub x: i32
[INFO] [stderr]   |         ^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Lifecycle` is never constructed
[INFO] [stderr]  --> src/lifecycle.rs:3:12
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub struct Lifecycle<'a> {
[INFO] [stderr]   |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `largest` is never used
[INFO] [stderr]   --> src/lifecycle.rs:14:4
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn largest<'a>(a: &'a i32, b: &'a i32) -> &'a i32 { // 声明了一个声明周期，跟泛型一样，泛型式声明了一个类型。
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `life`, `method_no_omit_lifecycle`, and `method` are never used
[INFO] [stderr]   --> src/lifecycle.rs:19:8
[INFO] [stderr]    |
[INFO] [stderr] 18 | impl<'a> Lifecycle<'a> {
[INFO] [stderr]    | ---------------------- associated items in this implementation
[INFO] [stderr] 19 |     fn life(arg: &'a str) -> &'a str {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] ...
[INFO] [stderr] 23 |     fn method_no_omit_lifecycle(&'a self) -> i32 {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 27 |     fn method(&self) -> i32 {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `test_dep_life` is never used
[INFO] [stderr]   --> src/lifecycle.rs:33:4
[INFO] [stderr]    |
[INFO] [stderr] 33 | fn test_dep_life<'a: 'b, 'b: 'c, 'c>(a: &'a String, b: &'b String) -> &'c String {
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `difficult` is never used
[INFO] [stderr]   --> src/lifecycle.rs:37:4
[INFO] [stderr]    |
[INFO] [stderr] 37 | fn difficult<'a, T>(x: &'a str, y: &'a str, z: T) -> &'a str
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `test_closure` is never used
[INFO] [stderr]  --> src/closure.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn test_closure() {
[INFO] [stderr]   |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `add` is never used
[INFO] [stderr]  --> src/closure.rs:8:4
[INFO] [stderr]   |
[INFO] [stderr] 8 | fn add(x: i32, y: i32) -> i32 {
[INFO] [stderr]   |    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `test_fn_pointer` is never used
[INFO] [stderr]   --> src/closure.rs:12:4
[INFO] [stderr]    |
[INFO] [stderr] 12 | fn test_fn_pointer() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Cache` is never constructed
[INFO] [stderr]   --> src/closure.rs:23:9
[INFO] [stderr]    |
[INFO] [stderr] 23 | struct  Cache<T>
[INFO] [stderr]    |         ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new` and `value` are never used
[INFO] [stderr]   --> src/closure.rs:35:8
[INFO] [stderr]    |
[INFO] [stderr] 31 | / impl<T> Cache<T>
[INFO] [stderr] 32 | | where
[INFO] [stderr] 33 | |     T: Fn(i32) -> i32,
[INFO] [stderr]    | |______________________- associated items in this implementation
[INFO] [stderr] 34 |   {
[INFO] [stderr] 35 |       fn new(method: T) -> Cache<T> {
[INFO] [stderr]    |          ^^^
[INFO] [stderr] ...
[INFO] [stderr] 42 |       fn value(&mut self, arg: i32) -> i32 {
[INFO] [stderr]    |          ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `add_once` is never used
[INFO] [stderr]   --> src/closure.rs:55:4
[INFO] [stderr]    |
[INFO] [stderr] 55 | fn add_once(x: i32) -> i32 {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `do_more` is never used
[INFO] [stderr]   --> src/closure.rs:59:4
[INFO] [stderr]    |
[INFO] [stderr] 59 | fn do_more(f: fn(i32) -> i32, arg: i32) -> i32 { // fn 表示函数指针类型
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `do_twice` is never used
[INFO] [stderr]   --> src/closure.rs:63:4
[INFO] [stderr]    |
[INFO] [stderr] 63 | fn do_twice<T>(f: T, arg: i32) -> i32
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `Status` is never used
[INFO] [stderr]   --> src/closure.rs:70:6
[INFO] [stderr]    |
[INFO] [stderr] 70 | enum Status {
[INFO] [stderr]    |      ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `return_closure` is never used
[INFO] [stderr]   --> src/closure.rs:75:4
[INFO] [stderr]    |
[INFO] [stderr] 75 | fn return_closure() -> impl Fn(i32) -> i32 { // 返回闭包需要闭包特征
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `return_closure_pro` is never used
[INFO] [stderr]   --> src/closure.rs:79:4
[INFO] [stderr]    |
[INFO] [stderr] 79 | fn return_closure_pro(a: i32) -> Box<dyn Fn(i32) -> i32> { // 返回闭包需要闭包特征
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `test` is never used
[INFO] [stderr]   --> src/closure.rs:87:4
[INFO] [stderr]    |
[INFO] [stderr] 87 | fn test() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused arithmetic operation that must be used
[INFO] [stderr]   --> src/main.rs:52:5
[INFO] [stderr]    |
[INFO] [stderr] 52 |     st2 + &st3;
[INFO] [stderr]    |     ^^^^^^^^^^ the arithmetic operation produces a value
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 52 |     let _ = st2 + &st3;
[INFO] [stderr]    |     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `learn` (bin "learn" test) generated 48 warnings (run `cargo fix --bin "learn" --tests` to apply 1 suggestion)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/learn-eeacdbe7d1263af5)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/bin/crateroot.rs (/opt/rustwide/target/debug/deps/crateroot-5b06d55dafc876f5)
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/learn-d27e5988c950789e)
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 7 tests
[INFO] [stdout] test tests::demotest::inner::some_expensive_method ... ignored, too expensive
[INFO] [stdout] test tests::demotest::inner::it_doesnot_work ... ok
[INFO] [stdout] test tests::demotest::it_works ... ok
[INFO] [stdout] test tests::demotest::test_result ... ok
[INFO] [stdout] test tests::demotest::test_should_panic - should panic ... ok
[INFO] [stdout] test tests::demotest::inner::it_doesnot_work_customize ... FAILED
[INFO] [stdout] test tests::demotest::test_should_panic_expected - should panic ... ok
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- tests::demotest::inner::it_doesnot_work_customize stdout ----
[INFO] [stdout] 
[INFO] [stdout] thread 'tests::demotest::inner::it_doesnot_work_customize' (28) panicked at src/tests/demotest.rs:34:9:
[INFO] [stdout] This is custom error info
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x57b4646d22c2 - std::backtrace_rs::backtrace::libunwind::trace::hcab59e1e990fdc24
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stderr] error: test failed, to rerun pass `--bin learn`
[INFO] [stdout]    1:     0x57b4646d22c2 - std::backtrace_rs::backtrace::trace_unsynchronized::he24cc57f3d2f47b7
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x57b4646d22c2 - std::sys::backtrace::_print_fmt::hf8d65ede198eeb54
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/sys/backtrace.rs:66:9
[INFO] [stdout]    3:     0x57b4646d22c2 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h67edf0e4d33c343c
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/sys/backtrace.rs:39:26
[INFO] [stdout]    4:     0x57b4646e23ef - core::fmt::rt::Argument::fmt::hef94184842aeafdd
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/core/src/fmt/rt.rs:173:76
[INFO] [stdout]    5:     0x57b4646e23ef - core::fmt::write::hcf0c66b48a8fa606
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/core/src/fmt/mod.rs:1468:25
[INFO] [stdout]    6:     0x57b46469f751 - std::io::default_write_fmt::h69967ac0ba93195f
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/io/mod.rs:639:11
[INFO] [stdout]    7:     0x57b46469f751 - std::io::Write::write_fmt::h8db9396209deaa1c
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/io/mod.rs:1954:13
[INFO] [stdout]    8:     0x57b4646ab892 - std::sys::backtrace::BacktraceLock::print::h07e5435aa717b414
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/sys/backtrace.rs:42:9
[INFO] [stdout]    9:     0x57b4646b03df - std::panicking::default_hook::{{closure}}::h91001850288db5f7
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panicking.rs:301:27
[INFO] [stdout]   10:     0x57b4646b0271 - std::panicking::default_hook::h2346dbb704ef5512
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panicking.rs:325:9
[INFO] [stdout]   11:     0x57b464670d5e - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h18383b2e29377420
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/alloc/src/boxed.rs:1999:9
[INFO] [stdout]   12:     0x57b464670d5e - test::test_main_with_exit_callback::{{closure}}::h272d7ef99aef06dc
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/test/src/lib.rs:145:21
[INFO] [stdout]   13:     0x57b4646b0a9f - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h6dba6e441651a0d1
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/alloc/src/boxed.rs:1999:9
[INFO] [stdout]   14:     0x57b4646b0a9f - std::panicking::panic_with_hook::hd2b063a6090d23a4
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panicking.rs:842:13
[INFO] [stdout]   15:     0x57b4646b08c6 - std::panicking::panic_handler::{{closure}}::he666d95f139a333e
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panicking.rs:700:13
[INFO] [stdout]   16:     0x57b4646ab9c9 - std::sys::backtrace::__rust_end_short_backtrace::h631ad224854ebee5
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/sys/backtrace.rs:174:18
[INFO] [stdout]   17:     0x57b464693c2d - __rustc[1d67440d6e82e4f]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panicking.rs:698:5
[INFO] [stdout]   18:     0x57b4646e9d00 - core::panicking::panic_fmt::h420ddb7fd73daf53
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/core/src/panicking.rs:75:14
[INFO] [stdout]   19:     0x57b46464f995 - learn::tests::demotest::inner::it_doesnot_work_customize::h1d0f71eaf204f628
[INFO] [stdout]                                at /opt/rustwide/workdir/src/tests/demotest.rs:34:9
[INFO] [stdout]   20:     0x57b46464f9b7 - learn::tests::demotest::inner::it_doesnot_work_customize::{{closure}}::hb0392fc729940192
[INFO] [stdout]                                at /opt/rustwide/workdir/src/tests/demotest.rs:33:35
[INFO] [stdout]   21:     0x57b46464de16 - core::ops::function::FnOnce::call_once::h9ee53638c78351c1
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   22:     0x57b464670b1b - core::ops::function::FnOnce::call_once::h70887edf07a630ba
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   23:     0x57b464670b1b - test::__rust_begin_short_backtrace::h27763c4cbbdb8601
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/test/src/lib.rs:663:18
[INFO] [stdout]   24:     0x57b464686785 - test::run_test_in_process::{{closure}}::h4dc8bc6d5e3924d3
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/test/src/lib.rs:686:74
[INFO] [stdout]   25:     0x57b464686785 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h75905e8ffe81974f
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   26:     0x57b464686785 - std::panicking::catch_unwind::do_call::h0bc60366ba66eba5
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panicking.rs:590:40
[INFO] [stdout]   27:     0x57b464686785 - std::panicking::catch_unwind::hae1ec7bf94407afa
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panicking.rs:553:19
[INFO] [stdout]   28:     0x57b464686785 - std::panic::catch_unwind::h0f4ff4773d84d3cd
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panic.rs:359:14
[INFO] [stdout]   29:     0x57b464686785 - test::run_test_in_process::h03fbc77ae48b3f10
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/test/src/lib.rs:686:27
[INFO] [stdout]   30:     0x57b464686785 - test::run_test::{{closure}}::h83476a9c453dc4d3
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/test/src/lib.rs:607:43
[INFO] [stdout]   31:     0x57b46465cf74 - test::run_test::{{closure}}::h515482ad1e7fe7de
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/test/src/lib.rs:637:41
[INFO] [stdout]   32:     0x57b46465cf74 - std::sys::backtrace::__rust_begin_short_backtrace::hed09f6ac5fe9d647
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/sys/backtrace.rs:158:18
[INFO] [stdout]   33:     0x57b46466083a - std::thread::Builder::spawn_unchecked_::{{closure}}::{{closure}}::h988e2cd969319888
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/thread/mod.rs:559:17
[INFO] [stdout]   34:     0x57b46466083a - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::hd70e28dc46ec20be
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   35:     0x57b46466083a - std::panicking::catch_unwind::do_call::hdc29e11311eb7655
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panicking.rs:590:40
[INFO] [stdout]   36:     0x57b46466083a - std::panicking::catch_unwind::h9e402d6a96fef41c
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panicking.rs:553:19
[INFO] [stdout]   37:     0x57b46466083a - std::panic::catch_unwind::h9213c0c54aec70e0
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panic.rs:359:14
[INFO] [stdout]   38:     0x57b46466083a - std::thread::Builder::spawn_unchecked_::{{closure}}::h6262965869ed2b87
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/thread/mod.rs:557:30
[INFO] [stdout]   39:     0x57b46466083a - core::ops::function::FnOnce::call_once{{vtable.shim}}::h05c05ed02619e462
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   40:     0x57b4646a6b2f - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h2044e71c41d3958a
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/alloc/src/boxed.rs:1985:9
[INFO] [stdout]   41:     0x57b4646a6b2f - std::sys::thread::unix::Thread::new::thread_start::hf277835320aa8e5a
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/sys/thread/unix.rs:126:17
[INFO] [stdout]   42:     0x7f84db906aa4 - <unknown>
[INFO] [stdout]   43:     0x7f84db993a34 - clone
[INFO] [stdout]   44:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     tests::demotest::inner::it_doesnot_work_customize
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 5 passed; 1 failed; 1 ignored; 0 measured; 0 filtered out; finished in 0.06s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "7ec8e35059d260f97e1eb4d2c7d7e0a2cb004bbba156b74a8449df9d342fbe7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7ec8e35059d260f97e1eb4d2c7d7e0a2cb004bbba156b74a8449df9d342fbe7e", kill_on_drop: false }`
[INFO] [stdout] 7ec8e35059d260f97e1eb4d2c7d7e0a2cb004bbba156b74a8449df9d342fbe7e
