[INFO] cloning repository https://github.com/kotamat/rust_tutorial
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kotamat/rust_tutorial" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkotamat%2Frust_tutorial", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkotamat%2Frust_tutorial'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] bf3226407efe0da3edb393fb0babbde348c0bea3
[INFO] checking kotamat/rust_tutorial against master#c1feb3eceef7d5f0126c309a87062cf413fe0a25 for pr-121053
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkotamat%2Frust_tutorial" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kotamat/rust_tutorial on toolchain c1feb3eceef7d5f0126c309a87062cf413fe0a25
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c1feb3eceef7d5f0126c309a87062cf413fe0a25" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kotamat/rust_tutorial
[INFO] finished tweaking git repo https://github.com/kotamat/rust_tutorial
[INFO] tweaked toml for git repo https://github.com/kotamat/rust_tutorial written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/kotamat/rust_tutorial 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" "+c1feb3eceef7d5f0126c309a87062cf413fe0a25" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking kotamat/rust_tutorial against try#0d3c0c4551bd9d6b6a4bd51e251b596e0195adf5 for pr-121053
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkotamat%2Frust_tutorial" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kotamat/rust_tutorial on toolchain 0d3c0c4551bd9d6b6a4bd51e251b596e0195adf5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0d3c0c4551bd9d6b6a4bd51e251b596e0195adf5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kotamat/rust_tutorial
[INFO] finished tweaking git repo https://github.com/kotamat/rust_tutorial
[INFO] tweaked toml for git repo https://github.com/kotamat/rust_tutorial written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/kotamat/rust_tutorial 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" "+0d3c0c4551bd9d6b6a4bd51e251b596e0195adf5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+0d3c0c4551bd9d6b6a4bd51e251b596e0195adf5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6654cf564b4be33a328b4dbfc2894b14054d0acbb78d094d356a7cb71bbf42cc
[INFO] running `Command { std: "docker" "start" "-a" "6654cf564b4be33a328b4dbfc2894b14054d0acbb78d094d356a7cb71bbf42cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6654cf564b4be33a328b4dbfc2894b14054d0acbb78d094d356a7cb71bbf42cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6654cf564b4be33a328b4dbfc2894b14054d0acbb78d094d356a7cb71bbf42cc", kill_on_drop: false }`
[INFO] [stdout] 6654cf564b4be33a328b4dbfc2894b14054d0acbb78d094d356a7cb71bbf42cc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+0d3c0c4551bd9d6b6a4bd51e251b596e0195adf5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2037eaf7615f6ccb37c4d82d2db62d9e24664d89ed4c7e84840f7326491f0692
[INFO] running `Command { std: "docker" "start" "-a" "2037eaf7615f6ccb37c4d82d2db62d9e24664d89ed4c7e84840f7326491f0692", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.97
[INFO] [stderr]     Checking tests v0.1.0 (/opt/rustwide/workdir/tests)
[INFO] [stderr]     Checking restaurant v0.1.0 (/opt/rustwide/workdir/restaurant)
[INFO] [stderr]     Checking function v0.1.0 (/opt/rustwide/workdir/function)
[INFO] [stderr]     Checking generics v0.1.0 (/opt/rustwide/workdir/generics)
[INFO] [stderr]     Checking pattern_match v0.1.0 (/opt/rustwide/workdir/pattern_match)
[INFO] [stderr]     Checking structs v0.1.0 (/opt/rustwide/workdir/structs)
[INFO] [stderr]     Checking macros v0.1.0 (/opt/rustwide/workdir/macros)
[INFO] [stderr]     Checking enums v0.1.0 (/opt/rustwide/workdir/enums)
[INFO] [stderr]     Checking ownership v0.1.0 (/opt/rustwide/workdir/ownership)
[INFO] [stderr]     Checking rust_tutorial v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking collections v0.1.0 (/opt/rustwide/workdir/collections)
[INFO] [stderr]     Checking oop v0.1.0 (/opt/rustwide/workdir/oop)
[INFO] [stderr]     Checking advanced_functions v0.1.0 (/opt/rustwide/workdir/advanced_functions)
[INFO] [stderr]     Checking concurrency v0.1.0 (/opt/rustwide/workdir/concurrency)
[INFO] [stdout] error[E0502]: cannot borrow `s` as mutable because it is also borrowed as immutable
[INFO] [stdout]   --> ownership/src/main.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let word = first_word(&s);
[INFO] [stdout]    |                           -- immutable borrow occurs here
[INFO] [stdout] 24 |     s.clear();
[INFO] [stdout]    |     ^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] 25 |     println!("the first word is: {}", word);
[INFO] [stdout]    |                                       ---- immutable borrow later used here
[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 E0502`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ownership` (bin "ownership") due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused import: `crate::largest`
[INFO] [stdout]  --> generics/src/lifetime.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::largest;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::hash::Hash`
[INFO] [stdout]  --> collections/src/hashmap.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::hash::Hash;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> tests/src/lib.rs:63:17
[INFO] [stdout]    |
[INFO] [stdout] 63 | pub fn greeting(name: &str) -> String {
[INFO] [stdout]    |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]   --> tests/src/lib.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | struct Rectangle {
[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]   --> tests/src/lib.rs:58:8
[INFO] [stdout]    |
[INFO] [stdout] 57 | impl Rectangle {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] 58 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]   --> tests/src/lib.rs:69:5
[INFO] [stdout]    |
[INFO] [stdout] 68 | pub struct Guess {
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] 69 |     value: i32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_two` is never used
[INFO] [stdout]  --> tests/src/test_organization.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn add_two(a: i32) -> i32 {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `internal_adder` is never used
[INFO] [stdout]  --> tests/src/test_organization.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn internal_adder(a: i32, b: i32) -> i32 {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> generics/src/lifetime.rs:63:26
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn pick1<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout]    |                          ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `BorrowMut`, `Borrow`
[INFO] [stdout]  --> oop/src/oo_design_patterns.rs:1:19
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::borrow::{Borrow, BorrowMut};
[INFO] [stdout]   |                   ^^^^^^  ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> concurrency/src/shared_state.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::JoinHandle`
[INFO] [stdout]  --> concurrency/src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::thread::JoinHandle;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order1`
[INFO] [stdout]   --> restaurant/src/lib.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let order1 = Soup;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order2`
[INFO] [stdout]   --> restaurant/src/lib.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let order2 = Salad;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `serve_order` is never used
[INFO] [stdout]  --> restaurant/src/lib.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn serve_order() {}
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fix_incorrect_order` is never used
[INFO] [stdout]   --> restaurant/src/lib.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn fix_incorrect_order() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `cook_order` is never used
[INFO] [stdout]   --> restaurant/src/lib.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 |     fn cook_order() {}
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `seasonal_fruit` is never read
[INFO] [stdout]   --> restaurant/src/lib.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub struct Breakfast {
[INFO] [stdout]    |                --------- field in this struct
[INFO] [stdout] 18 |         pub toast: String,
[INFO] [stdout] 19 |         seasonal_fruit: String,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> generics/src/traits.rs:73:24
[INFO] [stdout]    |
[INFO] [stdout] 73 | fn some_function<T, U>(t: &T, u: &U)
[INFO] [stdout]    |                        ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]   --> generics/src/traits.rs:73:31
[INFO] [stdout]    |
[INFO] [stdout] 73 | fn some_function<T, U>(t: &T, u: &U)
[INFO] [stdout]    |                               ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `part` is never read
[INFO] [stdout]   --> generics/src/lifetime.rs:80:5
[INFO] [stdout]    |
[INFO] [stdout] 79 | struct ImportantExcerpt<'a> {
[INFO] [stdout]    |        ---------------- field in this struct
[INFO] [stdout] 80 |     part: &'a str,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ImportantExcerpt` 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: unused variable: `user2`
[INFO] [stdout]   --> structs/src/main.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let user2 = User {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user2`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word` is never used
[INFO] [stdout]   --> generics/src/lifetime.rs:95:4
[INFO] [stdout]    |
[INFO] [stdout] 95 | fn first_word(s: &str) -> &str {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]   --> structs/src/main.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let black = Color(0, 0, 0);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_black`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `level` and `announce_and_return_part` are never used
[INFO] [stdout]    --> generics/src/lifetime.rs:116:8
[INFO] [stdout]     |
[INFO] [stdout] 114 | impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]     | ----------------------------- methods in this implementation
[INFO] [stdout] 115 |     // 条件1
[INFO] [stdout] 116 |     fn level(&self) -> i32 {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 121 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `origin`
[INFO] [stdout]   --> structs/src/main.rs:40:9
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let origin = Point(0, 0, 0);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_origin`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_with_an_announcement` is never used
[INFO] [stdout]    --> generics/src/lifetime.rs:129:4
[INFO] [stdout]     |
[INFO] [stdout] 129 | fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]   --> generics/src/traits.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 9  | pub struct NewsArticle {
[INFO] [stdout]    |            ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 13 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]   --> generics/src/traits.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub struct Tweet {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 25 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 26 |     pub retweet: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify2` is never used
[INFO] [stdout]   --> generics/src/traits.rs:69:4
[INFO] [stdout]    |
[INFO] [stdout] 69 | fn notify2<T: Summary>(item: &T) {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_function` is never used
[INFO] [stdout]   --> generics/src/traits.rs:73:4
[INFO] [stdout]    |
[INFO] [stdout] 73 | fn some_function<T, U>(t: &T, u: &U)
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `sign_in_count` and `active` are never read
[INFO] [stdout]  --> structs/src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct User {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 6 |     sign_in_count: u64,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 7 |     active: bool,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]   --> enums/src/matches.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let six = plus_one(Some(5));
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list_of_statuses`
[INFO] [stdout]   --> advanced_functions/src/main.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let list_of_statuses: Vec<Status> = (0u32..20).map(Status::Value).collect();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_list_of_statuses`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, and `2` are never read
[INFO] [stdout]   --> structs/src/main.rs:37:18
[INFO] [stdout]    |
[INFO] [stdout] 37 |     struct Color(i32, i32, i32);
[INFO] [stdout]    |            ----- ^^^  ^^^  ^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            fields in this struct
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 37 |     struct Color((), (), ());
[INFO] [stdout]    |                  ~~  ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> advanced_functions/src/main.rs:17:15
[INFO] [stdout]    |
[INFO] [stdout] 17 |         Value(u32),
[INFO] [stdout]    |         ----- ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` 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 |         Value(()),
[INFO] [stdout]    |               ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Stop` is never constructed
[INFO] [stdout]   --> advanced_functions/src/main.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     enum Status {
[INFO] [stdout]    |          ------ variant in this enum
[INFO] [stdout] 17 |         Value(u32),
[INFO] [stdout] 18 |         Stop,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, and `2` are never read
[INFO] [stdout]   --> structs/src/main.rs:38:18
[INFO] [stdout]    |
[INFO] [stdout] 38 |     struct Point(i32, i32, i32);
[INFO] [stdout]    |            ----- ^^^  ^^^  ^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            fields in this struct
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 38 |     struct Point((), (), ());
[INFO] [stdout]    |                  ~~  ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `returns_closure` is never used
[INFO] [stdout]   --> advanced_functions/src/main.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn returns_closure() -> Box<dyn Fn(i32) -> i32> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `none`
[INFO] [stdout]   --> enums/src/matches.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let none = plus_one(None);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_none`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home`
[INFO] [stdout]   --> enums/src/main.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let home = IpAddr {
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home`
[INFO] [stdout]   --> enums/src/main.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let home = IpAddr2::V4("127.0.0.1".to_string());
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home`
[INFO] [stdout]   --> enums/src/main.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let home = IpAddr3::V4(127, 0, 0, 1);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback`
[INFO] [stdout]   --> enums/src/main.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let loopback = IpAddr3::V6("::1".to_string());
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]   --> oop/src/oo_design_patterns.rs:69:27
[INFO] [stdout]    |
[INFO] [stdout] 69 |     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: variant `V6` is never constructed
[INFO] [stdout]  --> enums/src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum IpAddrKind {
[INFO] [stdout]   |      ---------- variant in this enum
[INFO] [stdout] 5 |     V4,
[INFO] [stdout] 6 |     V6,
[INFO] [stdout]   |     ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `kind` and `address` are never read
[INFO] [stdout]   --> enums/src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 9  | struct IpAddr {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 10 |     kind: IpAddrKind,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 11 |     address: String,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> enums/src/main.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 |     V4(String),
[INFO] [stdout]    |     -- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 15 |     V4(()),
[INFO] [stdout]    |        ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `V6` is never constructed
[INFO] [stdout]   --> enums/src/main.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | enum IpAddr2 {
[INFO] [stdout]    |      ------- variant in this enum
[INFO] [stdout] 15 |     V4(String),
[INFO] [stdout] 16 |     V6(String),
[INFO] [stdout]    |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, `2`, and `3` are never read
[INFO] [stdout]   --> enums/src/main.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 |     V4(u8, u8, u8, u8),
[INFO] [stdout]    |     -- ^^  ^^  ^^  ^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 20 |     V4((), (), (), ()),
[INFO] [stdout]    |        ~~  ~~  ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> enums/src/main.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 |     V6(String),
[INFO] [stdout]    |     -- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 21 |     V6(()),
[INFO] [stdout]    |        ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Alaska` is never constructed
[INFO] [stdout]  --> enums/src/matches.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum UsState {
[INFO] [stdout]   |      ------- variant in this enum
[INFO] [stdout] 3 |     Alabama,
[INFO] [stdout] 4 |     Alaska,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Penny`, `Nickel`, and `Dime` are never constructed
[INFO] [stdout]   --> enums/src/matches.rs:8:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | enum Coin {
[INFO] [stdout]    |      ---- variants in this enum
[INFO] [stdout] 8  |     Penny,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 9  |     Nickel,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 10 |     Dime,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `move_in_spawn_thread` is never used
[INFO] [stdout]   --> concurrency/src/main.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn move_in_spawn_thread() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `handle_spawn_thread` is never used
[INFO] [stdout]   --> concurrency/src/main.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn handle_spawn_thread() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> concurrency/src/message_passing.rs:5:15
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub(crate) fn main() {
[INFO] [stdout]   |               ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `normal_messaging` is never used
[INFO] [stdout]   --> concurrency/src/message_passing.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn normal_messaging() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `multi_producing` is never used
[INFO] [stdout]   --> concurrency/src/message_passing.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn multi_producing() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> collections/src/strings.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let s = format!("{}-{}-{}", s1, s2, s3);
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> collections/src/main.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let row: Vec<SpreadsheetCell> = vec![
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 14 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stdout]   --> pattern_match/src/pattern.rs:90:5
[INFO] [stdout]    |
[INFO] [stdout] 89 | enum Message {
[INFO] [stdout]    |      ------- variants in this enum
[INFO] [stdout] 90 |     Quit,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 91 |     Move { x: i32, y: i32 },
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 92 |     Write(String),
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Rgb` is never constructed
[INFO] [stdout]   --> pattern_match/src/pattern.rs:96:5
[INFO] [stdout]    |
[INFO] [stdout] 95 | enum Color {
[INFO] [stdout]    |      ----- variant in this enum
[INFO] [stdout] 96 |     Rgb(i32, i32, i32),
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `Write` are never constructed
[INFO] [stdout]    --> pattern_match/src/pattern.rs:100:5
[INFO] [stdout]     |
[INFO] [stdout] 99  | enum Message2 {
[INFO] [stdout]     |      -------- variants in this enum
[INFO] [stdout] 100 |     Quit,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 101 |     Move { x: i32, y: i32 },
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 102 |     Write(String),
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Screen2` is never constructed
[INFO] [stdout]   --> oop/src/trait_object.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 | struct Screen2<T: Draw> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `run` is never used
[INFO] [stdout]   --> oop/src/trait_object.rs:47:12
[INFO] [stdout]    |
[INFO] [stdout] 43 | / impl<T> Screen2<T>
[INFO] [stdout] 44 | | where
[INFO] [stdout] 45 | |     T: Draw,
[INFO] [stdout]    | |____________- method in this implementation
[INFO] [stdout] 46 |   {
[INFO] [stdout] 47 |       pub fn run(&self) {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `width`, `height`, and `label` are never read
[INFO] [stdout]   --> oop/src/trait_object.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub struct Button {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 55 |     pub width: u32,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 56 |     pub height: u32,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 57 |     pub label: String,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `width`, `height`, and `options` are never read
[INFO] [stdout]   --> oop/src/trait_object.rs:67:5
[INFO] [stdout]    |
[INFO] [stdout] 66 | struct SelectBox {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 67 |     width: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 68 |     height: u32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 69 |     options: Vec<String>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "2037eaf7615f6ccb37c4d82d2db62d9e24664d89ed4c7e84840f7326491f0692", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2037eaf7615f6ccb37c4d82d2db62d9e24664d89ed4c7e84840f7326491f0692", kill_on_drop: false }`
[INFO] [stdout] 2037eaf7615f6ccb37c4d82d2db62d9e24664d89ed4c7e84840f7326491f0692