[INFO] cloning repository https://github.com/Dawson-Jones/learn_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Dawson-Jones/learn_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDawson-Jones%2Flearn_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDawson-Jones%2Flearn_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1a433ed2cf5ae3da5023c3707fcb0f26526d6376
[INFO] testing Dawson-Jones/learn_rust against 1.75.0 for beta-1.76-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDawson-Jones%2Flearn_rust" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Dawson-Jones/learn_rust on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Dawson-Jones/learn_rust
[INFO] finished tweaking git repo https://github.com/Dawson-Jones/learn_rust
[INFO] tweaked toml for git repo https://github.com/Dawson-Jones/learn_rust written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/Dawson-Jones/learn_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" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded crossbeam-queue v0.3.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 26a54410e9b20ae4323a5e290a36dc80835d1be83299a4eb800cf8d2a9c5e6a3
[INFO] running `Command { std: "docker" "start" "-a" "26a54410e9b20ae4323a5e290a36dc80835d1be83299a4eb800cf8d2a9c5e6a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "26a54410e9b20ae4323a5e290a36dc80835d1be83299a4eb800cf8d2a9c5e6a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26a54410e9b20ae4323a5e290a36dc80835d1be83299a4eb800cf8d2a9c5e6a3", kill_on_drop: false }`
[INFO] [stdout] 26a54410e9b20ae4323a5e290a36dc80835d1be83299a4eb800cf8d2a9c5e6a3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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=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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 23b3312b104cc8d2149f65b8bd0a1aca7b31dfbc0774ecbfda65ffb4b9d26e8c
[INFO] running `Command { std: "docker" "start" "-a" "23b3312b104cc8d2149f65b8bd0a1aca7b31dfbc0774ecbfda65ffb4b9d26e8c", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling libc v0.2.137
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.47
[INFO] [stderr]    Compiling unicode-ident v1.0.5
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling syn v1.0.103
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling futures-core v0.3.25
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling pin-project-lite v0.2.9
[INFO] [stderr]    Compiling futures-channel v0.3.25
[INFO] [stderr]    Compiling futures-task v0.3.25
[INFO] [stderr]    Compiling crossbeam-utils v0.8.12
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling parking_lot_core v0.9.4
[INFO] [stderr]    Compiling slab v0.4.7
[INFO] [stderr]    Compiling lock_api v0.4.9
[INFO] [stderr]    Compiling futures-util v0.3.25
[INFO] [stderr]    Compiling futures-sink v0.3.25
[INFO] [stderr]    Compiling smallvec v1.10.0
[INFO] [stderr]    Compiling pin-utils v0.1.0
[INFO] [stderr]    Compiling futures-io v0.3.25
[INFO] [stderr]    Compiling tokio v1.21.2
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling mio v0.8.5
[INFO] [stderr]    Compiling num_cpus v1.14.0
[INFO] [stderr]    Compiling parking_lot v0.12.1
[INFO] [stderr]    Compiling signal-hook-registry v1.4.0
[INFO] [stderr]    Compiling socket2 v0.4.7
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.11
[INFO] [stderr]    Compiling bytes v1.2.1
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling crossbeam-queue v0.3.6
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling crossbeam-channel v0.5.6
[INFO] [stderr]    Compiling aho-corasick v1.0.1
[INFO] [stderr]    Compiling crossbeam-deque v0.8.2
[INFO] [stderr]    Compiling timer_future v0.1.0 (/opt/rustwide/workdir/timer_future)
[INFO] [stderr]    Compiling regex-syntax v0.7.1
[INFO] [stderr]    Compiling once_cell v1.17.1
[INFO] [stderr]    Compiling time v0.1.45
[INFO] [stderr]    Compiling crossbeam v0.8.2
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling futures-timer v3.0.2
[INFO] [stderr]    Compiling iana-time-zone v0.1.53
[INFO] [stderr]    Compiling arc-swap v1.6.0
[INFO] [stderr]    Compiling macro_learn v0.1.0 (/opt/rustwide/workdir/macro_learn)
[INFO] [stderr]    Compiling chrono v0.4.23
[INFO] [stderr]    Compiling regex v1.8.1
[INFO] [stderr]    Compiling futures-macro v0.3.25
[INFO] [stderr]    Compiling tokio-macros v1.8.0
[INFO] [stderr]    Compiling global_variables v0.1.0 (/opt/rustwide/workdir/global_variables)
[INFO] [stderr]    Compiling futures-executor v0.3.25
[INFO] [stderr]    Compiling futures v0.3.25
[INFO] [stderr]    Compiling executor v0.1.0 (/opt/rustwide/workdir/executor)
[INFO] [stdout] warning: unused import: `Poll`
[INFO] [stdout]   --> executor/src/main.rs:11:25
[INFO] [stdout]    |
[INFO] [stdout] 11 |         task::{Context, Poll},
[INFO] [stdout]    |                         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling tokio-stream v0.1.11
[INFO] [stderr]    Compiling fust_tutorials v0.1.0 (/opt/rustwide/workdir/fust_tutorials)
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]    --> fust_tutorials/src/lib.rs:259:27
[INFO] [stdout]     |
[INFO] [stdout] 259 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]     |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]   --> fust_tutorials/src/lib.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 24 | struct News {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 28 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `can_hold` is never used
[INFO] [stdout]   --> fust_tutorials/src/lib.rs:71:8
[INFO] [stdout]    |
[INFO] [stdout] 61 | impl Rectangle {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 71 |     fn can_hold(&self, other: &Self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `seat_at_table` is never used
[INFO] [stdout]  --> fust_tutorials/src/front_of_house.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 |     fn seat_at_table() {}
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_order` is never used
[INFO] [stdout]  --> fust_tutorials/src/front_of_house.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn take_order(){}
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `serve_order` is never used
[INFO] [stdout]  --> fust_tutorials/src/front_of_house.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn serve_order(){}
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_payment` is never used
[INFO] [stdout]   --> fust_tutorials/src/front_of_house.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn take_payment(){}
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Guess` is never constructed
[INFO] [stdout]  --> fust_tutorials/src/guess.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Guess {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]  --> fust_tutorials/src/guess.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl Guess {
[INFO] [stdout]   | ---------- associated function in this implementation
[INFO] [stdout] 7 |     pub fn new(value: i32) -> Guess {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling future_learn v0.1.0 (/opt/rustwide/workdir/future_learn)
[INFO] [stdout] warning: unused import: `Poll`
[INFO] [stdout]  --> future_learn/src/lib.rs:3:26
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::task::{Context, Poll};
[INFO] [stdout]   |                          ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> future_learn/src/lib.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |         self.executor.send(self.clone());
[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] 17 |         let _ = self.executor.send(self.clone());
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `rcList` should have an upper camel case name
[INFO] [stdout]    --> fust_tutorials/src/main.rs:729:6
[INFO] [stdout]     |
[INFO] [stdout] 729 | enum rcList {
[INFO] [stdout]     |      ^^^^^^ help: convert the identifier to upper camel case: `RcList`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Sender`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:841:29
[INFO] [stdout]     |
[INFO] [stdout] 841 | use std::sync::mpsc::{self, Sender};
[INFO] [stdout]     |                             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `f_add` should have an upper camel case name
[INFO] [stdout]     --> fust_tutorials/src/main.rs:1109:6
[INFO] [stdout]      |
[INFO] [stdout] 1109 | type f_add = fn(i32, i32) -> i32;
[INFO] [stdout]      |      ^^^^^ help: convert the identifier to upper camel case: `FAdd`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `timer_future`
[INFO] [stdout]     --> fust_tutorials/src/main.rs:1177:5
[INFO] [stdout]      |
[INFO] [stdout] 1177 | use timer_future;
[INFO] [stdout]      |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Messager`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:405:49
[INFO] [stdout]     |
[INFO] [stdout] 405 | use fust_tutorials::{Tweet, Summary, Rectangle, Messager, Post};
[INFO] [stdout]     |                                                 ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> fust_tutorials/src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let x = 5;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `three`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:202:9
[INFO] [stdout]     |
[INFO] [stdout] 202 |     let three = User {
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_three`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:251:9
[INFO] [stdout]     |
[INFO] [stdout] 251 |     let y = back(x);
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:276:31
[INFO] [stdout]     |
[INFO] [stdout] 276 |                 Message::Move{x, y} => "move",
[INFO] [stdout]     |                               ^ help: try ignoring the field: `x: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:276:34
[INFO] [stdout]     |
[INFO] [stdout] 276 |                 Message::Move{x, y} => "move",
[INFO] [stdout]     |                                  ^ help: try ignoring the field: `y: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |     let x = if let Some(i) = some_num {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `first`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:315:9
[INFO] [stdout]     |
[INFO] [stdout] 315 |     let first = &v[0];
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ans`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:355:9
[INFO] [stdout]     |
[INFO] [stdout] 355 |     let ans = &hello[0..2]; // 慎用，用可能 panic
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_ans`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:376:9
[INFO] [stdout]     |
[INFO] [stdout] 376 |     let value = scores.get("Blue");
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `score`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:383:13
[INFO] [stdout]     |
[INFO] [stdout] 383 |     let mut score: HashMap<_, _> = teams.into_iter().zip(initial_scores.into_iter()).collect();
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> fust_tutorials/src/main.rs:383:9
[INFO] [stdout]     |
[INFO] [stdout] 383 |     let mut score: HashMap<_, _> = teams.into_iter().zip(initial_scores.into_iter()).collect();
[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: `t`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:509:20
[INFO] [stdout]     |
[INFO] [stdout] 509 | fn some_func<T, U>(t: &T, u: &U) -> i32 
[INFO] [stdout]     |                    ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:509:27
[INFO] [stdout]     |
[INFO] [stdout] 509 | fn some_func<T, U>(t: &T, u: &U) -> i32 
[INFO] [stdout]     |                           ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `excerpt`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:536:9
[INFO] [stdout]     |
[INFO] [stdout] 536 |     let excerpt = Excerpt {
[INFO] [stdout]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_excerpt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list_node`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:688:9
[INFO] [stdout]     |
[INFO] [stdout] 688 |     let list_node = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil))))));
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_list_node`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:739:9
[INFO] [stdout]     |
[INFO] [stdout] 739 |     let b = Cons(3, Rc::clone(&a)); // 使用 Rc::clone(), a 的引用计数加 1 
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:742:13
[INFO] [stdout]     |
[INFO] [stdout] 742 |         let c = Cons(4, Rc::clone(&a));
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `typeofdata` is never used
[INFO] [stdout]   --> fust_tutorials/src/main.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn typeofdata() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `arra_y` is never used
[INFO] [stdout]   --> fust_tutorials/src/main.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn arra_y() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `use_while` is never used
[INFO] [stdout]   --> fust_tutorials/src/main.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn use_while() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `ChangeColor` are never constructed
[INFO] [stdout]    --> fust_tutorials/src/main.rs:266:5
[INFO] [stdout]     |
[INFO] [stdout] 265 | enum Message {
[INFO] [stdout]     |      ------- variants in this enum
[INFO] [stdout] 266 |     Quit,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 267 |     Move { x: i32, y: i32 },
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 268 |     Write(String),
[INFO] [stdout] 269 |     ChangeColor(i32, i32, i32),
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `module` is never used
[INFO] [stdout]    --> fust_tutorials/src/main.rs:309:4
[INFO] [stdout]     |
[INFO] [stdout] 309 | fn module() {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_handle_with_wrap_helper` is never used
[INFO] [stdout]    --> fust_tutorials/src/main.rs:429:4
[INFO] [stdout]     |
[INFO] [stdout] 429 | fn error_handle_with_wrap_helper(file: &str) -> Result<String, io::Error> { // 枚举是一个范型, 范型用<>
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_handle_with_wrap` is never used
[INFO] [stdout]    --> fust_tutorials/src/main.rs:463:4
[INFO] [stdout]     |
[INFO] [stdout] 463 | fn error_handle_with_wrap() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_func` is never used
[INFO] [stdout]    --> fust_tutorials/src/main.rs:509:4
[INFO] [stdout]     |
[INFO] [stdout] 509 | fn some_func<T, U>(t: &T, u: &U) -> i32 
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `part` is never read
[INFO] [stdout]    --> fust_tutorials/src/main.rs:530:5
[INFO] [stdout]     |
[INFO] [stdout] 529 | struct Excerpt<'a> {
[INFO] [stdout]     |        ------- field in this struct
[INFO] [stdout] 530 |     part: &'a str,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]    --> fust_tutorials/src/main.rs:541:4
[INFO] [stdout]     |
[INFO] [stdout] 541 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cacher` is never constructed
[INFO] [stdout]    --> fust_tutorials/src/main.rs:575:8
[INFO] [stdout]     |
[INFO] [stdout] 575 | struct Cacher<T, U> 
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `get_value` are never used
[INFO] [stdout]    --> fust_tutorials/src/main.rs:588:8
[INFO] [stdout]     |
[INFO] [stdout] 584 | / impl<T, U> Cacher<T, U>
[INFO] [stdout] 585 | |     where T: Fn(U) -> U, 
[INFO] [stdout] 586 | |           U: Hash + Eq + Copy,
[INFO] [stdout]     | |______________________________- associated items in this implementation
[INFO] [stdout] 587 |   {
[INFO] [stdout] 588 |       fn new(calculation: T) -> Self {
[INFO] [stdout]     |          ^^^
[INFO] [stdout] ...
[INFO] [stdout] 592 |       fn get_value(&mut self, arg: U) -> U {
[INFO] [stdout]     |          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generate_workout` is never used
[INFO] [stdout]    --> fust_tutorials/src/main.rs:605:4
[INFO] [stdout]     |
[INFO] [stdout] 605 | fn generate_workout(intensity: u32, random_number: u32) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `closure` is never used
[INFO] [stdout]    --> fust_tutorials/src/main.rs:630:4
[INFO] [stdout]     |
[INFO] [stdout] 630 | fn closure() {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value` and `children` are never read
[INFO] [stdout]    --> fust_tutorials/src/main.rs:790:5
[INFO] [stdout]     |
[INFO] [stdout] 789 | struct Node {
[INFO] [stdout]     |        ---- fields in this struct
[INFO] [stdout] 790 |     value: i32,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 791 |     parent: RefCell<Weak<Node>>,
[INFO] [stdout] 792 |     children: RefCell<Vec<Rc<Node>>>,
[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 `label` is never read
[INFO] [stdout]    --> fust_tutorials/src/main.rs:930:5
[INFO] [stdout]     |
[INFO] [stdout] 927 | struct Button {
[INFO] [stdout]     |        ------ field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 930 |     label: String,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `options` is never read
[INFO] [stdout]    --> fust_tutorials/src/main.rs:943:5
[INFO] [stdout]     |
[INFO] [stdout] 940 | struct SelectBox {
[INFO] [stdout]     |        --------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 943 |     options: Vec<String>,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 39 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 27.10s
[INFO] running `Command { std: "docker" "inspect" "23b3312b104cc8d2149f65b8bd0a1aca7b31dfbc0774ecbfda65ffb4b9d26e8c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "23b3312b104cc8d2149f65b8bd0a1aca7b31dfbc0774ecbfda65ffb4b9d26e8c", kill_on_drop: false }`
[INFO] [stdout] 23b3312b104cc8d2149f65b8bd0a1aca7b31dfbc0774ecbfda65ffb4b9d26e8c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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=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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b915eca774420929fda3ba28f16fa805f24e0eba879e007269c6875657924572
[INFO] running `Command { std: "docker" "start" "-a" "b915eca774420929fda3ba28f16fa805f24e0eba879e007269c6875657924572", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]    --> fust_tutorials/src/lib.rs:259:27
[INFO] [stdout]     |
[INFO] [stdout] 259 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]     |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]   --> fust_tutorials/src/lib.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 24 | struct News {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 28 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `can_hold` is never used
[INFO] [stdout]   --> fust_tutorials/src/lib.rs:71:8
[INFO] [stdout]    |
[INFO] [stdout] 61 | impl Rectangle {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 71 |     fn can_hold(&self, other: &Self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `seat_at_table` is never used
[INFO] [stdout]  --> fust_tutorials/src/front_of_house.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 |     fn seat_at_table() {}
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_order` is never used
[INFO] [stdout]  --> fust_tutorials/src/front_of_house.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn take_order(){}
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `serve_order` is never used
[INFO] [stdout]  --> fust_tutorials/src/front_of_house.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn serve_order(){}
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_payment` is never used
[INFO] [stdout]   --> fust_tutorials/src/front_of_house.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn take_payment(){}
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Guess` is never constructed
[INFO] [stdout]  --> fust_tutorials/src/guess.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Guess {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]  --> fust_tutorials/src/guess.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl Guess {
[INFO] [stdout]   | ---------- associated function in this implementation
[INFO] [stdout] 7 |     pub fn new(value: i32) -> Guess {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling fust_tutorials v0.1.0 (/opt/rustwide/workdir/fust_tutorials)
[INFO] [stderr]    Compiling global_variables v0.1.0 (/opt/rustwide/workdir/global_variables)
[INFO] [stdout] warning: unused import: `Poll`
[INFO] [stdout]  --> future_learn/src/lib.rs:3:26
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::task::{Context, Poll};
[INFO] [stdout]   |                          ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> future_learn/src/lib.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |         self.executor.send(self.clone());
[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] 17 |         let _ = self.executor.send(self.clone());
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling future_learn v0.1.0 (/opt/rustwide/workdir/future_learn)
[INFO] [stdout] warning: unused imports: `Add`, `Div`, `Mul`, `Rem`, `Sub`, `write`
[INFO] [stdout]  --> fust_tutorials/examples/7_trait_obj.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{ops::{Add, Sub, Mul, Div, Rem, DerefMut}, fmt::{Display, write}};
[INFO] [stdout]   |                 ^^^  ^^^  ^^^  ^^^  ^^^                            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b_`
[INFO] [stdout]   --> fust_tutorials/examples/12_pointer.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let b_: u8 = match b.try_into() {
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_b_`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0601]: `main` function not found in crate `pin`
[INFO] [stdout]   |
[INFO] [stdout]   = note: consider adding a `main` function to `global_variables/examples/pin.rs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0601`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `global_variables` (example "pin") due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: struct `Screen` is never constructed
[INFO] [stdout]   --> fust_tutorials/examples/7_trait_obj.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | struct Screen {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `iter::Sum`
[INFO] [stdout]  --> fust_tutorials/examples/6_trait.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{iter::Sum, ops::Add, fmt::Display};
[INFO] [stdout]   |           ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `RScallC` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = help: convert the identifier to snake case: `rscall_c`
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `width`, `height`, and `options` are never read
[INFO] [stdout]   --> fust_tutorials/examples/7_trait_obj.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct SelectBox {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 35 |     width: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 36 |     height: u32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 37 |     options: Vec<String>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `iter1`
[INFO] [stdout]   --> fust_tutorials/examples/6_trait.rs:15:23
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn notify<T: Summary>(iter1: &T, item2: &T) { }
[INFO] [stdout]    |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_iter1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item2`
[INFO] [stdout]   --> fust_tutorials/examples/6_trait.rs:15:34
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn notify<T: Summary>(iter1: &T, item2: &T) { }
[INFO] [stdout]    |                                  ^^^^^ help: if this is intentional, prefix it with an underscore: `_item2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `borrow::Borrow`
[INFO] [stdout]  --> fust_tutorials/examples/15_circle_reference.rs:1:42
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{cell::RefCell, rc::{Rc, Weak}, borrow::Borrow};
[INFO] [stdout]   |                                          ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify` is never used
[INFO] [stdout]   --> fust_tutorials/examples/6_trait.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn notify<T: Summary>(iter1: &T, item2: &T) { }
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Open` is never constructed
[INFO] [stdout]   --> fust_tutorials/examples/6_trait.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 37 | enum FileState {
[INFO] [stdout]    |      --------- variant in this enum
[INFO] [stdout] 38 |     Open,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `FileState` 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 `data` is never read
[INFO] [stdout]   --> fust_tutorials/examples/6_trait.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct File {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 44 |     name: String,
[INFO] [stdout] 45 |     data: Vec<u8>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `File` 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 `value` and `clildren` are never read
[INFO] [stdout]    --> fust_tutorials/examples/15_circle_reference.rs:115:5
[INFO] [stdout]     |
[INFO] [stdout] 114 | struct Node {
[INFO] [stdout]     |        ---- fields in this struct
[INFO] [stdout] 115 |     value: i32,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 116 |     parent: RefCell<Weak<Node>>,
[INFO] [stdout] 117 |     clildren: RefCell<Vec<Rc<Node>>>,
[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]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Tree` is never constructed
[INFO] [stdout]    --> fust_tutorials/examples/15_circle_reference.rs:122:8
[INFO] [stdout]     |
[INFO] [stdout] 122 | struct Tree {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Nodee` is never constructed
[INFO] [stdout]    --> fust_tutorials/examples/15_circle_reference.rs:127:8
[INFO] [stdout]     |
[INFO] [stdout] 127 | struct Nodee {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> fust_tutorials/examples/15_circle_reference.rs:135:8
[INFO] [stdout]     |
[INFO] [stdout] 134 | impl Tree {
[INFO] [stdout]     | --------- associated function in this implementation
[INFO] [stdout] 135 |     fn new() -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: linking with `cc` failed: exit status: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note: LC_ALL="C" PATH="/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/opt/rustwide/cargo-home/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" VSLANG="1033" "cc" "-m64" "/tmp/rustcbNwC3G/symbols.o" "/opt/rustwide/target/debug/examples/RScallC-7363e5a0b76751d6.RScallC.f687d85bc129e632-cgu.0.rcgu.o" "/opt/rustwide/target/debug/examples/RScallC-7363e5a0b76751d6.22vmzu2vzk3tyvvu.rcgu.o" "-Wl,--as-needed" "-L" "/opt/rustwide/target/debug/deps" "-L" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-90f6ddbf82de36ec.rlib" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-480c41e9d4e1f677.rlib" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libobject-db744c0ca03eed1d.rlib" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libmemchr-8ba652dc7d4b285a.rlib" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libaddr2line-d5f4520a9ebc0d58.rlib" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgimli-4ad84de58f0cb463.rlib" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-0d10aae2e0f38735.rlib" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd_detect-0c17cff739e6745b.rlib" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-b29e17139dde1aa8.rlib" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-1f975299829cc7bd.rlib" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libminiz_oxide-86bae3bc3079f89b.rlib" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libadler-321b82c30dffdf5f.rlib" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-3dd8a6810a0bdfef.rlib" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-eb39a61c0c879984.rlib" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-aa769569f91c3548.rlib" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-510a192a50a983ed.rlib" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-0577018320f99037.rlib" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-193cf992125ccd4c.rlib" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-8e138eaf26ebb4a8.rlib" "-Wl,-Bdynamic" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/opt/rustwide/target/debug/examples/RScallC-7363e5a0b76751d6" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-nodefaultlibs"
[INFO] [stdout]   = note: /usr/bin/ld: /opt/rustwide/target/debug/examples/RScallC-7363e5a0b76751d6.RScallC.f687d85bc129e632-cgu.0.rcgu.o: in function `RScallC::main':
[INFO] [stdout]           /opt/rustwide/workdir/fust_tutorials/examples/RScallC/main.rs:8: undefined reference to `add'
[INFO] [stdout]           collect2: error: ld returned 1 exit status
[INFO] [stdout]           
[INFO] [stdout]   = note: some `extern` functions couldn't be found; some native libraries may need to be installed or have their path specified
[INFO] [stdout]   = note: use the `-l` flag to specify native libraries to link
[INFO] [stdout]   = note: use the `cargo:rustc-link-lib` directive to specify the native libraries to link with Cargo (see https://doc.rust-lang.org/cargo/reference/build-scripts.html#cargorustc-link-libkindname)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `fust_tutorials` (example "RScallC") due to 2 previous errors; 1 warning emitted
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "b915eca774420929fda3ba28f16fa805f24e0eba879e007269c6875657924572", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b915eca774420929fda3ba28f16fa805f24e0eba879e007269c6875657924572", kill_on_drop: false }`
[INFO] [stdout] b915eca774420929fda3ba28f16fa805f24e0eba879e007269c6875657924572
[INFO] testing Dawson-Jones/learn_rust against beta-2023-12-22 for beta-1.76-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDawson-Jones%2Flearn_rust" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Dawson-Jones/learn_rust on toolchain beta-2023-12-22
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-12-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Dawson-Jones/learn_rust
[INFO] finished tweaking git repo https://github.com/Dawson-Jones/learn_rust
[INFO] tweaked toml for git repo https://github.com/Dawson-Jones/learn_rust written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Dawson-Jones/learn_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" "+beta-2023-12-22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-12-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c37016b68314d3ac1829811a760dec0d7c1934952e71f0fdff880359544cdc88
[INFO] running `Command { std: "docker" "start" "-a" "c37016b68314d3ac1829811a760dec0d7c1934952e71f0fdff880359544cdc88", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c37016b68314d3ac1829811a760dec0d7c1934952e71f0fdff880359544cdc88", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c37016b68314d3ac1829811a760dec0d7c1934952e71f0fdff880359544cdc88", kill_on_drop: false }`
[INFO] [stdout] c37016b68314d3ac1829811a760dec0d7c1934952e71f0fdff880359544cdc88
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-12-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 47a17963348907ad9a5bb1e99ebeeb7b6734b2b5de5157b69ed562a195a2ccc6
[INFO] running `Command { std: "docker" "start" "-a" "47a17963348907ad9a5bb1e99ebeeb7b6734b2b5de5157b69ed562a195a2ccc6", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling libc v0.2.137
[INFO] [stderr]    Compiling proc-macro2 v1.0.47
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling unicode-ident v1.0.5
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling syn v1.0.103
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling futures-core v0.3.25
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling pin-project-lite v0.2.9
[INFO] [stderr]    Compiling futures-channel v0.3.25
[INFO] [stderr]    Compiling slab v0.4.7
[INFO] [stderr]    Compiling futures-task v0.3.25
[INFO] [stderr]    Compiling lock_api v0.4.9
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling parking_lot_core v0.9.4
[INFO] [stderr]    Compiling crossbeam-utils v0.8.12
[INFO] [stderr]    Compiling futures-sink v0.3.25
[INFO] [stderr]    Compiling futures-util v0.3.25
[INFO] [stderr]    Compiling smallvec v1.10.0
[INFO] [stderr]    Compiling futures-io v0.3.25
[INFO] [stderr]    Compiling pin-utils v0.1.0
[INFO] [stderr]    Compiling tokio v1.21.2
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling mio v0.8.5
[INFO] [stderr]    Compiling parking_lot v0.12.1
[INFO] [stderr]    Compiling signal-hook-registry v1.4.0
[INFO] [stderr]    Compiling num_cpus v1.14.0
[INFO] [stderr]    Compiling socket2 v0.4.7
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.11
[INFO] [stderr]    Compiling bytes v1.2.1
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling crossbeam-queue v0.3.6
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling crossbeam-channel v0.5.6
[INFO] [stderr]    Compiling aho-corasick v1.0.1
[INFO] [stderr]    Compiling crossbeam-deque v0.8.2
[INFO] [stderr]    Compiling regex-syntax v0.7.1
[INFO] [stderr]    Compiling timer_future v0.1.0 (/opt/rustwide/workdir/timer_future)
[INFO] [stderr]    Compiling once_cell v1.17.1
[INFO] [stderr]    Compiling time v0.1.45
[INFO] [stderr]    Compiling crossbeam v0.8.2
[INFO] [stderr]    Compiling arc-swap v1.6.0
[INFO] [stderr]    Compiling iana-time-zone v0.1.53
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling futures-timer v3.0.2
[INFO] [stderr]    Compiling macro_learn v0.1.0 (/opt/rustwide/workdir/macro_learn)
[INFO] [stderr]    Compiling chrono v0.4.23
[INFO] [stderr]    Compiling regex v1.8.1
[INFO] [stderr]    Compiling futures-macro v0.3.25
[INFO] [stderr]    Compiling tokio-macros v1.8.0
[INFO] [stderr]    Compiling global_variables v0.1.0 (/opt/rustwide/workdir/global_variables)
[INFO] [stderr]    Compiling futures-executor v0.3.25
[INFO] [stderr]    Compiling futures v0.3.25
[INFO] [stderr]    Compiling executor v0.1.0 (/opt/rustwide/workdir/executor)
[INFO] [stdout] warning: unused import: `Poll`
[INFO] [stdout]   --> executor/src/main.rs:11:25
[INFO] [stdout]    |
[INFO] [stdout] 11 |         task::{Context, Poll},
[INFO] [stdout]    |                         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling tokio-stream v0.1.11
[INFO] [stderr]    Compiling fust_tutorials v0.1.0 (/opt/rustwide/workdir/fust_tutorials)
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]    --> fust_tutorials/src/lib.rs:259:27
[INFO] [stdout]     |
[INFO] [stdout] 259 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]     |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]   --> fust_tutorials/src/lib.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 24 | struct News {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 28 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `can_hold` is never used
[INFO] [stdout]   --> fust_tutorials/src/lib.rs:71:8
[INFO] [stdout]    |
[INFO] [stdout] 61 | impl Rectangle {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 71 |     fn can_hold(&self, other: &Self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `seat_at_table` is never used
[INFO] [stdout]  --> fust_tutorials/src/front_of_house.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 |     fn seat_at_table() {}
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_order` is never used
[INFO] [stdout]  --> fust_tutorials/src/front_of_house.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn take_order(){}
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `serve_order` is never used
[INFO] [stdout]  --> fust_tutorials/src/front_of_house.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn serve_order(){}
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_payment` is never used
[INFO] [stdout]   --> fust_tutorials/src/front_of_house.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn take_payment(){}
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Guess` is never constructed
[INFO] [stdout]  --> fust_tutorials/src/guess.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Guess {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]  --> fust_tutorials/src/guess.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl Guess {
[INFO] [stdout]   | ---------- associated function in this implementation
[INFO] [stdout] 7 |     pub fn new(value: i32) -> Guess {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling future_learn v0.1.0 (/opt/rustwide/workdir/future_learn)
[INFO] [stdout] warning: unused import: `Poll`
[INFO] [stdout]  --> future_learn/src/lib.rs:3:26
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::task::{Context, Poll};
[INFO] [stdout]   |                          ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> future_learn/src/lib.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |         self.executor.send(self.clone());
[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] 17 |         let _ = self.executor.send(self.clone());
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `rcList` should have an upper camel case name
[INFO] [stdout]    --> fust_tutorials/src/main.rs:729:6
[INFO] [stdout]     |
[INFO] [stdout] 729 | enum rcList {
[INFO] [stdout]     |      ^^^^^^ help: convert the identifier to upper camel case: `RcList`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Sender`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:841:29
[INFO] [stdout]     |
[INFO] [stdout] 841 | use std::sync::mpsc::{self, Sender};
[INFO] [stdout]     |                             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `f_add` should have an upper camel case name
[INFO] [stdout]     --> fust_tutorials/src/main.rs:1109:6
[INFO] [stdout]      |
[INFO] [stdout] 1109 | type f_add = fn(i32, i32) -> i32;
[INFO] [stdout]      |      ^^^^^ help: convert the identifier to upper camel case: `FAdd`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `timer_future`
[INFO] [stdout]     --> fust_tutorials/src/main.rs:1177:5
[INFO] [stdout]      |
[INFO] [stdout] 1177 | use timer_future;
[INFO] [stdout]      |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Messager`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:405:49
[INFO] [stdout]     |
[INFO] [stdout] 405 | use fust_tutorials::{Tweet, Summary, Rectangle, Messager, Post};
[INFO] [stdout]     |                                                 ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> fust_tutorials/src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let x = 5;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `three`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:202:9
[INFO] [stdout]     |
[INFO] [stdout] 202 |     let three = User {
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_three`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:251:9
[INFO] [stdout]     |
[INFO] [stdout] 251 |     let y = back(x);
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:276:31
[INFO] [stdout]     |
[INFO] [stdout] 276 |                 Message::Move{x, y} => "move",
[INFO] [stdout]     |                               ^ help: try ignoring the field: `x: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:276:34
[INFO] [stdout]     |
[INFO] [stdout] 276 |                 Message::Move{x, y} => "move",
[INFO] [stdout]     |                                  ^ help: try ignoring the field: `y: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:294:9
[INFO] [stdout]     |
[INFO] [stdout] 294 |     let x = if let Some(i) = some_num {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `first`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:315:9
[INFO] [stdout]     |
[INFO] [stdout] 315 |     let first = &v[0];
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ans`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:355:9
[INFO] [stdout]     |
[INFO] [stdout] 355 |     let ans = &hello[0..2]; // 慎用，用可能 panic
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_ans`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:376:9
[INFO] [stdout]     |
[INFO] [stdout] 376 |     let value = scores.get("Blue");
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `score`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:383:13
[INFO] [stdout]     |
[INFO] [stdout] 383 |     let mut score: HashMap<_, _> = teams.into_iter().zip(initial_scores.into_iter()).collect();
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> fust_tutorials/src/main.rs:383:9
[INFO] [stdout]     |
[INFO] [stdout] 383 |     let mut score: HashMap<_, _> = teams.into_iter().zip(initial_scores.into_iter()).collect();
[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: `t`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:509:20
[INFO] [stdout]     |
[INFO] [stdout] 509 | fn some_func<T, U>(t: &T, u: &U) -> i32 
[INFO] [stdout]     |                    ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:509:27
[INFO] [stdout]     |
[INFO] [stdout] 509 | fn some_func<T, U>(t: &T, u: &U) -> i32 
[INFO] [stdout]     |                           ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `excerpt`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:536:9
[INFO] [stdout]     |
[INFO] [stdout] 536 |     let excerpt = Excerpt {
[INFO] [stdout]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_excerpt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list_node`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:688:9
[INFO] [stdout]     |
[INFO] [stdout] 688 |     let list_node = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil))))));
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_list_node`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:739:9
[INFO] [stdout]     |
[INFO] [stdout] 739 |     let b = Cons(3, Rc::clone(&a)); // 使用 Rc::clone(), a 的引用计数加 1 
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> fust_tutorials/src/main.rs:742:13
[INFO] [stdout]     |
[INFO] [stdout] 742 |         let c = Cons(4, Rc::clone(&a));
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `typeofdata` is never used
[INFO] [stdout]   --> fust_tutorials/src/main.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn typeofdata() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `arra_y` is never used
[INFO] [stdout]   --> fust_tutorials/src/main.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn arra_y() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `use_while` is never used
[INFO] [stdout]   --> fust_tutorials/src/main.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn use_while() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `ChangeColor` are never constructed
[INFO] [stdout]    --> fust_tutorials/src/main.rs:266:5
[INFO] [stdout]     |
[INFO] [stdout] 265 | enum Message {
[INFO] [stdout]     |      ------- variants in this enum
[INFO] [stdout] 266 |     Quit,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 267 |     Move { x: i32, y: i32 },
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 268 |     Write(String),
[INFO] [stdout] 269 |     ChangeColor(i32, i32, i32),
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `module` is never used
[INFO] [stdout]    --> fust_tutorials/src/main.rs:309:4
[INFO] [stdout]     |
[INFO] [stdout] 309 | fn module() {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_handle_with_wrap_helper` is never used
[INFO] [stdout]    --> fust_tutorials/src/main.rs:429:4
[INFO] [stdout]     |
[INFO] [stdout] 429 | fn error_handle_with_wrap_helper(file: &str) -> Result<String, io::Error> { // 枚举是一个范型, 范型用<>
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `error_handle_with_wrap` is never used
[INFO] [stdout]    --> fust_tutorials/src/main.rs:463:4
[INFO] [stdout]     |
[INFO] [stdout] 463 | fn error_handle_with_wrap() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_func` is never used
[INFO] [stdout]    --> fust_tutorials/src/main.rs:509:4
[INFO] [stdout]     |
[INFO] [stdout] 509 | fn some_func<T, U>(t: &T, u: &U) -> i32 
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `part` is never read
[INFO] [stdout]    --> fust_tutorials/src/main.rs:530:5
[INFO] [stdout]     |
[INFO] [stdout] 529 | struct Excerpt<'a> {
[INFO] [stdout]     |        ------- field in this struct
[INFO] [stdout] 530 |     part: &'a str,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]    --> fust_tutorials/src/main.rs:541:4
[INFO] [stdout]     |
[INFO] [stdout] 541 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cacher` is never constructed
[INFO] [stdout]    --> fust_tutorials/src/main.rs:575:8
[INFO] [stdout]     |
[INFO] [stdout] 575 | struct Cacher<T, U> 
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `get_value` are never used
[INFO] [stdout]    --> fust_tutorials/src/main.rs:588:8
[INFO] [stdout]     |
[INFO] [stdout] 584 | / impl<T, U> Cacher<T, U>
[INFO] [stdout] 585 | |     where T: Fn(U) -> U, 
[INFO] [stdout] 586 | |           U: Hash + Eq + Copy,
[INFO] [stdout]     | |______________________________- associated items in this implementation
[INFO] [stdout] 587 |   {
[INFO] [stdout] 588 |       fn new(calculation: T) -> Self {
[INFO] [stdout]     |          ^^^
[INFO] [stdout] ...
[INFO] [stdout] 592 |       fn get_value(&mut self, arg: U) -> U {
[INFO] [stdout]     |          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generate_workout` is never used
[INFO] [stdout]    --> fust_tutorials/src/main.rs:605:4
[INFO] [stdout]     |
[INFO] [stdout] 605 | fn generate_workout(intensity: u32, random_number: u32) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `closure` is never used
[INFO] [stdout]    --> fust_tutorials/src/main.rs:630:4
[INFO] [stdout]     |
[INFO] [stdout] 630 | fn closure() {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value` and `children` are never read
[INFO] [stdout]    --> fust_tutorials/src/main.rs:790:5
[INFO] [stdout]     |
[INFO] [stdout] 789 | struct Node {
[INFO] [stdout]     |        ---- fields in this struct
[INFO] [stdout] 790 |     value: i32,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 791 |     parent: RefCell<Weak<Node>>,
[INFO] [stdout] 792 |     children: RefCell<Vec<Rc<Node>>>,
[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 `label` is never read
[INFO] [stdout]    --> fust_tutorials/src/main.rs:930:5
[INFO] [stdout]     |
[INFO] [stdout] 927 | struct Button {
[INFO] [stdout]     |        ------ field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 930 |     label: String,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `options` is never read
[INFO] [stdout]    --> fust_tutorials/src/main.rs:943:5
[INFO] [stdout]     |
[INFO] [stdout] 940 | struct SelectBox {
[INFO] [stdout]     |        --------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 943 |     options: Vec<String>,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 39 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 22.00s
[INFO] running `Command { std: "docker" "inspect" "47a17963348907ad9a5bb1e99ebeeb7b6734b2b5de5157b69ed562a195a2ccc6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "47a17963348907ad9a5bb1e99ebeeb7b6734b2b5de5157b69ed562a195a2ccc6", kill_on_drop: false }`
[INFO] [stdout] 47a17963348907ad9a5bb1e99ebeeb7b6734b2b5de5157b69ed562a195a2ccc6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-12-22" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d3ea2486557e76d1bc6dba8439dcc1de6b1e4aa335ec7c4bed8aec3638d5db9b
[INFO] running `Command { std: "docker" "start" "-a" "d3ea2486557e76d1bc6dba8439dcc1de6b1e4aa335ec7c4bed8aec3638d5db9b", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]    --> fust_tutorials/src/lib.rs:259:27
[INFO] [stdout]     |
[INFO] [stdout] 259 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]     |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]   --> fust_tutorials/src/lib.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 24 | struct News {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 28 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `can_hold` is never used
[INFO] [stdout]   --> fust_tutorials/src/lib.rs:71:8
[INFO] [stdout]    |
[INFO] [stdout] 61 | impl Rectangle {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 71 |     fn can_hold(&self, other: &Self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `seat_at_table` is never used
[INFO] [stdout]  --> fust_tutorials/src/front_of_house.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 |     fn seat_at_table() {}
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_order` is never used
[INFO] [stdout]  --> fust_tutorials/src/front_of_house.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn take_order(){}
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `serve_order` is never used
[INFO] [stdout]  --> fust_tutorials/src/front_of_house.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn serve_order(){}
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_payment` is never used
[INFO] [stdout]   --> fust_tutorials/src/front_of_house.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn take_payment(){}
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Guess` is never constructed
[INFO] [stdout]  --> fust_tutorials/src/guess.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Guess {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]  --> fust_tutorials/src/guess.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl Guess {
[INFO] [stdout]   | ---------- associated function in this implementation
[INFO] [stdout] 7 |     pub fn new(value: i32) -> Guess {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling fust_tutorials v0.1.0 (/opt/rustwide/workdir/fust_tutorials)
[INFO] [stderr]    Compiling global_variables v0.1.0 (/opt/rustwide/workdir/global_variables)
[INFO] [stdout] warning: unused import: `Poll`
[INFO] [stdout]  --> future_learn/src/lib.rs:3:26
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::task::{Context, Poll};
[INFO] [stdout]   |                          ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> future_learn/src/lib.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |         self.executor.send(self.clone());
[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] 17 |         let _ = self.executor.send(self.clone());
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling future_learn v0.1.0 (/opt/rustwide/workdir/future_learn)
[INFO] [stdout] warning: unused imports: `Add`, `Div`, `Mul`, `Rem`, `Sub`, `write`
[INFO] [stdout]  --> fust_tutorials/examples/7_trait_obj.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{ops::{Add, Sub, Mul, Div, Rem, DerefMut}, fmt::{Display, write}};
[INFO] [stdout]   |                 ^^^  ^^^  ^^^  ^^^  ^^^                            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> future_learn/examples/5_tokio1.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 9  | async fn main() {
[INFO] [stdout]    |                - expected `()` because of default return type
[INFO] [stdout] ...
[INFO] [stdout] 19 |     yield_now()
[INFO] [stdout]    |     ^^^^^^^^^^^ expected `()`, found future
[INFO] [stdout]    |
[INFO] [stdout] note: calling an async function returns a future
[INFO] [stdout]   --> future_learn/examples/5_tokio1.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     yield_now()
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] help: consider `await`ing on the `Future`
[INFO] [stdout]    |
[INFO] [stdout] 19 |     yield_now().await
[INFO] [stdout]    |                ++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `future_learn` (example "5_tokio1") due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused import: `Ref`
[INFO] [stdout]  --> fust_tutorials/examples/rc_refcell.rs:1:26
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{rc::Rc, cell::{Ref, RefCell}};
[INFO] [stdout]   |                          ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Screen` is never constructed
[INFO] [stdout]   --> fust_tutorials/examples/7_trait_obj.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | struct Screen {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `width`, `height`, and `options` are never read
[INFO] [stdout]   --> fust_tutorials/examples/7_trait_obj.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct SelectBox {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 35 |     width: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 36 |     height: u32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 37 |     options: Vec<String>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "d3ea2486557e76d1bc6dba8439dcc1de6b1e4aa335ec7c4bed8aec3638d5db9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d3ea2486557e76d1bc6dba8439dcc1de6b1e4aa335ec7c4bed8aec3638d5db9b", kill_on_drop: false }`
[INFO] [stdout] d3ea2486557e76d1bc6dba8439dcc1de6b1e4aa335ec7c4bed8aec3638d5db9b
