[INFO] cloning repository https://github.com/kind0Dev/hello_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kind0Dev/hello_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkind0Dev%2Fhello_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkind0Dev%2Fhello_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 76604e7b291aaf2b10ae96eef085cb6e96b0a03e
[INFO] checking kind0Dev/hello_rust against master#c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3 for pr-141352
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkind0Dev%2Fhello_rust" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kind0Dev/hello_rust on toolchain c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kind0Dev/hello_rust
[INFO] finished tweaking git repo https://github.com/kind0Dev/hello_rust
[INFO] tweaked toml for git repo https://github.com/kind0Dev/hello_rust written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/kind0Dev/hello_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" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 49068445b0ce53e22f569129ac7d73f86c414ce891d96e810baa322cd56adf52
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[INFO] running `Command { std: "docker" "inspect" "49068445b0ce53e22f569129ac7d73f86c414ce891d96e810baa322cd56adf52", kill_on_drop: false }`
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[INFO] [stdout] 49068445b0ce53e22f569129ac7d73f86c414ce891d96e810baa322cd56adf52
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fffbff5b8417a728af5f3fbd98951cc0e43be1c424d71c4fc439daf574b55135
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[INFO] [stderr]    Compiling autocfg v1.4.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.94
[INFO] [stderr]    Compiling unicode-ident v1.0.18
[INFO] [stderr]    Compiling libc v0.2.171
[INFO] [stderr]    Compiling crossbeam-utils v0.8.21
[INFO] [stderr]    Compiling parking_lot_core v0.9.10
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking smallvec v1.15.0
[INFO] [stderr]    Compiling thiserror v1.0.69
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]     Checking iana-time-zone v0.1.61
[INFO] [stderr]     Checking colored v3.0.0
[INFO] [stderr]    Compiling lock_api v0.4.12
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]     Checking crossbeam-channel v0.5.15
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]    Compiling syn v2.0.100
[INFO] [stderr]     Checking chrono v0.4.40
[INFO] [stderr]     Checking parking_lot v0.12.3
[INFO] [stderr]    Compiling thiserror-impl v1.0.69
[INFO] [stderr]     Checking activities v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/bin/a28.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 |     Custom(String),
[INFO] [stdout]    |     ------ ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Color` 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] 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 -     Custom(String),
[INFO] [stdout] 17 +     Custom(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple variants are never constructed
[INFO] [stdout]   --> src/bin/a28.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | enum Color {
[INFO] [stdout]    |      ----- variants in this enum
[INFO] [stdout] 14 |     Black,
[INFO] [stdout] 15 |     Blue,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 16 |     Brown,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 17 |     Custom(String),
[INFO] [stdout] 18 |     Gray,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 19 |     Green,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 20 |     Purple,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 21 |     Red,
[INFO] [stdout] 22 |     White,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 23 |     Yellow,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Color` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Truck` is never constructed
[INFO] [stdout]   --> src/bin/a30.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 45 | struct Truck;
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `bo`
[INFO] [stdout]   --> src/bin/a34.rs:79:12
[INFO] [stdout]    |
[INFO] [stdout] 79 |         Ok(bo) => println!("user receive item successfully"),
[INFO] [stdout]    |            ^^ help: if this is intentional, prefix it with an underscore: `_bo`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Black` and `White` are never constructed
[INFO] [stdout]   --> src/bin/a7.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | enum Color {
[INFO] [stdout]    |      ----- variants in this enum
[INFO] [stdout] 14 |     Black,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 15 |     White,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Color` 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 `Truck` is never constructed
[INFO] [stdout]   --> src/bin/a30.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 45 | struct Truck;
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/bin/a18b.rs:46:13
[INFO] [stdout]    |
[INFO] [stdout] 46 |             _ => Err("Not a position".to_owned()) 
[INFO] [stdout]    |             ^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/bin/a18b.rs:46:13
[INFO] [stdout]    |
[INFO] [stdout] 40 |             Position::Maintenance => Ok(self),
[INFO] [stdout]    |             --------------------- matches some of the same values
[INFO] [stdout] 41 |             Position::Marketing => Ok(self),
[INFO] [stdout]    |             ------------------- matches some of the same values
[INFO] [stdout] 42 |             Position::Managers  => Ok(self),
[INFO] [stdout]    |             ------------------ matches some of the same values
[INFO] [stdout] 43 |             Position::LineSupervisors  => Ok(self),
[INFO] [stdout]    |             ------------------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 46 |             _ => Err("Not a position".to_owned()) 
[INFO] [stdout]    |             ^ ...and 2 other patterns collectively make this unreachable
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `state` is never read
[INFO] [stdout]   --> src/bin/a34.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 19 | struct Luggage<State>{
[INFO] [stdout]    |        ------- field in this struct
[INFO] [stdout] 20 |     userid: i32,
[INFO] [stdout] 21 |     state: State
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `check_status`
[INFO] [stdout]   --> src/bin/a18b.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |         let check_status = self.status.check_status()?;
[INFO] [stdout]    |             ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_check_status`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tile`
[INFO] [stdout]   --> src/bin/a35.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let tile = Tile::Water(Pressure(11));
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_tile`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tilet`
[INFO] [stdout]   --> src/bin/a35.rs:59:9
[INFO] [stdout]    |
[INFO] [stdout] 59 |     let tilet = Tile::Treasure(TreasureChest { content: TreasureItem::Gold, amount: 100 });
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_tilet`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tile3`
[INFO] [stdout]   --> src/bin/a35.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |     let tile3 = Tile::Sand;
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_tile3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tile`
[INFO] [stdout]   --> src/bin/a35.rs:74:5
[INFO] [stdout]    |
[INFO] [stdout] 74 |     tile @ Tile::Grass | tile @ Tile::Dirt | tile @ Tile::Sand => println!("Ground tile"),
[INFO] [stdout]    |     ^^^^                 ^^^^                ^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]    |
[INFO] [stdout] 74 |     _tile @ Tile::Grass | _tile @ Tile::Dirt | _tile @ Tile::Sand => println!("Ground tile"),
[INFO] [stdout]    |     +                     +                    +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `SuperPower` is never constructed
[INFO] [stdout]   --> src/bin/a35.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | enum TreasureItem {
[INFO] [stdout]    |      ------------ variant in this enum
[INFO] [stdout] 26 |     Gold,
[INFO] [stdout] 27 |     SuperPower,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TreasureItem` 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: variants `Dungeon`, `Gray`, and `Red` are never constructed
[INFO] [stdout]   --> src/bin/a35.rs:41:5
[INFO] [stdout]    |
[INFO] [stdout] 40 | enum BrickStyle {
[INFO] [stdout]    |      ---------- variants in this enum
[INFO] [stdout] 41 |     Dungeon,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 42 |     Gray,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 43 |     Red,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `BrickStyle` 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 `Brick`, `Dirt`, and `Grass` are never constructed
[INFO] [stdout]   --> src/bin/a35.rs:48:5
[INFO] [stdout]    |
[INFO] [stdout] 47 | enum Tile {
[INFO] [stdout]    |      ---- variants in this enum
[INFO] [stdout] 48 |     Brick(BrickStyle),
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 49 |     Dirt,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 50 |     Grass,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Tile` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `clamp` is never used
[INFO] [stdout]   --> src/bin/a22.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn clamp(n: i32, lower: i32, upper: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `div` is never used
[INFO] [stdout]   --> src/bin/a22.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn div(a: i32, b: i32) -> Option<i32> {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `concat` is never used
[INFO] [stdout]   --> src/bin/a22.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn concat(first: &str, second: &str) -> String {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `bo`
[INFO] [stdout]   --> src/bin/a34.rs:79:12
[INFO] [stdout]    |
[INFO] [stdout] 79 |         Ok(bo) => println!("user receive item successfully"),
[INFO] [stdout]    |            ^^ help: if this is intentional, prefix it with an underscore: `_bo`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/a36.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let mut stream: Vec<_> = data().chunks(2).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: fields `user_id` and `name` are never read
[INFO] [stdout]   --> src/bin/a21.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct User {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 13 |     user_id: i32,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 14 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `User` 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: field `state` is never read
[INFO] [stdout]   --> src/bin/a34.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 19 | struct Luggage<State>{
[INFO] [stdout]    |        ------- field in this struct
[INFO] [stdout] 20 |     userid: i32,
[INFO] [stdout] 21 |     state: State
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tile`
[INFO] [stdout]   --> src/bin/a35.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let tile = Tile::Water(Pressure(11));
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_tile`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tilet`
[INFO] [stdout]   --> src/bin/a35.rs:59:9
[INFO] [stdout]    |
[INFO] [stdout] 59 |     let tilet = Tile::Treasure(TreasureChest { content: TreasureItem::Gold, amount: 100 });
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_tilet`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tile3`
[INFO] [stdout]   --> src/bin/a35.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |     let tile3 = Tile::Sand;
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_tile3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tile`
[INFO] [stdout]   --> src/bin/a35.rs:74:5
[INFO] [stdout]    |
[INFO] [stdout] 74 |     tile @ Tile::Grass | tile @ Tile::Dirt | tile @ Tile::Sand => println!("Ground tile"),
[INFO] [stdout]    |     ^^^^                 ^^^^                ^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]    |
[INFO] [stdout] 74 |     _tile @ Tile::Grass | _tile @ Tile::Dirt | _tile @ Tile::Sand => println!("Ground tile"),
[INFO] [stdout]    |     +                     +                    +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `SuperPower` is never constructed
[INFO] [stdout]   --> src/bin/a35.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | enum TreasureItem {
[INFO] [stdout]    |      ------------ variant in this enum
[INFO] [stdout] 26 |     Gold,
[INFO] [stdout] 27 |     SuperPower,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TreasureItem` 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: variants `Dungeon`, `Gray`, and `Red` are never constructed
[INFO] [stdout]   --> src/bin/a35.rs:41:5
[INFO] [stdout]    |
[INFO] [stdout] 40 | enum BrickStyle {
[INFO] [stdout]    |      ---------- variants in this enum
[INFO] [stdout] 41 |     Dungeon,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 42 |     Gray,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 43 |     Red,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `BrickStyle` 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 `Brick`, `Dirt`, and `Grass` are never constructed
[INFO] [stdout]   --> src/bin/a35.rs:48:5
[INFO] [stdout]    |
[INFO] [stdout] 47 | enum Tile {
[INFO] [stdout]    |      ---- variants in this enum
[INFO] [stdout] 48 |     Brick(BrickStyle),
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 49 |     Dirt,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 50 |     Grass,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Tile` 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 `Black` and `White` are never constructed
[INFO] [stdout]   --> src/bin/a7.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | enum Color {
[INFO] [stdout]    |      ----- variants in this enum
[INFO] [stdout] 14 |     Black,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 15 |     White,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Color` 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: field `0` is never read
[INFO] [stdout]   --> src/bin/a28.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 |     Custom(String),
[INFO] [stdout]    |     ------ ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Color` 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] 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 -     Custom(String),
[INFO] [stdout] 17 +     Custom(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple variants are never constructed
[INFO] [stdout]   --> src/bin/a28.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | enum Color {
[INFO] [stdout]    |      ----- variants in this enum
[INFO] [stdout] 14 |     Black,
[INFO] [stdout] 15 |     Blue,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 16 |     Brown,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 17 |     Custom(String),
[INFO] [stdout] 18 |     Gray,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 19 |     Green,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 20 |     Purple,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 21 |     Red,
[INFO] [stdout] 22 |     White,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 23 |     Yellow,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Color` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `activitylib::msg`
[INFO] [stdout]   --> src/bin/a39.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | use activitylib::msg;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/bin/a39.rs:74:9
[INFO] [stdout]    |
[INFO] [stdout] 46 | /         loop {
[INFO] [stdout] 47 | |             if let Ok(msg) = receiver.recv() {
[INFO] [stdout] 48 | |                 match msg {
[INFO] [stdout] 49 | |                     LightMsg::ChangeColor(r, g, b) => {
[INFO] [stdout] ...  |
[INFO] [stdout] 73 | |         }
[INFO] [stdout]    | |_________- any code following this expression is unreachable
[INFO] [stdout] 74 |           light_status
[INFO] [stdout]    |           ^^^^^^^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Unavailable` and `Rented` are never constructed
[INFO] [stdout]   --> src/bin/a40.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | enum VehicleStatus{
[INFO] [stdout]    |      ------------- variants in this enum
[INFO] [stdout] 28 |     Available, 
[INFO] [stdout] 29 |     Unavailable, 
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 30 |     Maintenance, 
[INFO] [stdout] 31 |     Rented
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `VehicleStatus` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `vehicle_type`, `vin_number`, and `vehicle_status` are never read
[INFO] [stdout]   --> src/bin/a40.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | struct RentalInfo{
[INFO] [stdout]    |        ---------- fields in this struct
[INFO] [stdout] 36 |     vehicle_type: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 37 |     vin_number: u64,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 38 |     vehicle_status: VehicleStatus
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `RentalInfo` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `light_status`
[INFO] [stdout]   --> src/bin/a39.rs:90:9
[INFO] [stdout]    |
[INFO] [stdout] 90 |     let light_status = light.join();
[INFO] [stdout]    |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_light_status`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/a39.rs:83:5
[INFO] [stdout]    |
[INFO] [stdout] 83 |     s.send(LightMsg::On);
[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] 83 |     let _ = s.send(LightMsg::On);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/a39.rs:84:5
[INFO] [stdout]    |
[INFO] [stdout] 84 |     s.send(LightMsg::ChangeColor(23, 24, 50));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 84 |     let _ = s.send(LightMsg::ChangeColor(23, 24, 50));
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/a39.rs:85:5
[INFO] [stdout]    |
[INFO] [stdout] 85 |     s.send(LightMsg::ChangeColor(255, 255, 255));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 85 |     let _ = s.send(LightMsg::ChangeColor(255, 255, 255));
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/a39.rs:86:5
[INFO] [stdout]    |
[INFO] [stdout] 86 |     s.send(LightMsg::ChangeColor(23, 88, 233));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let _ = s.send(LightMsg::ChangeColor(23, 88, 233));
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/a39.rs:87:5
[INFO] [stdout]    |
[INFO] [stdout] 87 |     s.send(LightMsg::Disconnect);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let _ = s.send(LightMsg::Disconnect);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/a39.rs:88:5
[INFO] [stdout]    |
[INFO] [stdout] 88 |     s.send(LightMsg::Off);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 88 |     let _ = s.send(LightMsg::Off);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::num`
[INFO] [stdout]   --> src/bin/p1.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | use core::num;
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::num`
[INFO] [stdout]   --> src/bin/a16.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use core::num;
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::num`
[INFO] [stdout]   --> src/bin/p1.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | use core::num;
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Unavailable` and `Rented` are never constructed
[INFO] [stdout]   --> src/bin/a40.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | enum VehicleStatus{
[INFO] [stdout]    |      ------------- variants in this enum
[INFO] [stdout] 28 |     Available, 
[INFO] [stdout] 29 |     Unavailable, 
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 30 |     Maintenance, 
[INFO] [stdout] 31 |     Rented
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `VehicleStatus` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `vehicle_type`, `vin_number`, and `vehicle_status` are never read
[INFO] [stdout]   --> src/bin/a40.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | struct RentalInfo{
[INFO] [stdout]    |        ---------- fields in this struct
[INFO] [stdout] 36 |     vehicle_type: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 37 |     vin_number: u64,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 38 |     vehicle_status: VehicleStatus
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `RentalInfo` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]   --> src/bin/a41.rs:78:28
[INFO] [stdout]    |
[INFO] [stdout] 78 |                 for job in jobs.pop_front() {
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(for_loops_over_fallibles)]` on by default
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]    |
[INFO] [stdout] 78 -                 for job in jobs.pop_front() {
[INFO] [stdout] 78 +                 while let Some(job) = jobs.pop_front() {
[INFO] [stdout]    |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    |
[INFO] [stdout] 78 -                 for job in jobs.pop_front() {
[INFO] [stdout] 78 +                 if let Some(job) = jobs.pop_front() {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `part_1` is never used
[INFO] [stdout]   --> src/bin/a23.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn part_1() -> bool {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `part_2` is never used
[INFO] [stdout]   --> src/bin/a23.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn part_2() -> Option<Access> {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `part_3` is never used
[INFO] [stdout]   --> src/bin/a23.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn part_3() -> Access {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Access` is never used
[INFO] [stdout]   --> src/bin/a23.rs:37:6
[INFO] [stdout]    |
[INFO] [stdout] 37 | enum Access {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `maybe_access` is never used
[INFO] [stdout]   --> src/bin/a23.rs:43:4
[INFO] [stdout]    |
[INFO] [stdout] 43 | fn maybe_access(name: &str) -> Option<Access> {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `root` is never used
[INFO] [stdout]   --> src/bin/a23.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn root() -> Option<Access> {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::num`
[INFO] [stdout]   --> src/bin/a16.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use core::num;
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]   --> src/bin/a41.rs:78:28
[INFO] [stdout]    |
[INFO] [stdout] 78 |                 for job in jobs.pop_front() {
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(for_loops_over_fallibles)]` on by default
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]    |
[INFO] [stdout] 78 -                 for job in jobs.pop_front() {
[INFO] [stdout] 78 +                 while let Some(job) = jobs.pop_front() {
[INFO] [stdout]    |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    |
[INFO] [stdout] 78 -                 for job in jobs.pop_front() {
[INFO] [stdout] 78 +                 if let Some(job) = jobs.pop_front() {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `activitylib::msg`
[INFO] [stdout]   --> src/bin/a39.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | use activitylib::msg;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/bin/a18b.rs:46:13
[INFO] [stdout]    |
[INFO] [stdout] 46 |             _ => Err("Not a position".to_owned()) 
[INFO] [stdout]    |             ^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/bin/a18b.rs:46:13
[INFO] [stdout]    |
[INFO] [stdout] 40 |             Position::Maintenance => Ok(self),
[INFO] [stdout]    |             --------------------- matches some of the same values
[INFO] [stdout] 41 |             Position::Marketing => Ok(self),
[INFO] [stdout]    |             ------------------- matches some of the same values
[INFO] [stdout] 42 |             Position::Managers  => Ok(self),
[INFO] [stdout]    |             ------------------ matches some of the same values
[INFO] [stdout] 43 |             Position::LineSupervisors  => Ok(self),
[INFO] [stdout]    |             ------------------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 46 |             _ => Err("Not a position".to_owned()) 
[INFO] [stdout]    |             ^ ...and 2 other patterns collectively make this unreachable
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `check_status`
[INFO] [stdout]   --> src/bin/a18b.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |         let check_status = self.status.check_status()?;
[INFO] [stdout]    |             ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_check_status`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/bin/a39.rs:74:9
[INFO] [stdout]    |
[INFO] [stdout] 46 | /         loop {
[INFO] [stdout] 47 | |             if let Ok(msg) = receiver.recv() {
[INFO] [stdout] 48 | |                 match msg {
[INFO] [stdout] 49 | |                     LightMsg::ChangeColor(r, g, b) => {
[INFO] [stdout] ...  |
[INFO] [stdout] 73 | |         }
[INFO] [stdout]    | |_________- any code following this expression is unreachable
[INFO] [stdout] 74 |           light_status
[INFO] [stdout]    |           ^^^^^^^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `light_status`
[INFO] [stdout]   --> src/bin/a39.rs:90:9
[INFO] [stdout]    |
[INFO] [stdout] 90 |     let light_status = light.join();
[INFO] [stdout]    |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_light_status`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/a36.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let mut stream: Vec<_> = data().chunks(2).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: fields `user_id` and `name` are never read
[INFO] [stdout]   --> src/bin/a21.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct User {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 13 |     user_id: i32,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 14 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `User` 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 `Result` that must be used
[INFO] [stdout]   --> src/bin/a39.rs:83:5
[INFO] [stdout]    |
[INFO] [stdout] 83 |     s.send(LightMsg::On);
[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] 83 |     let _ = s.send(LightMsg::On);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/a39.rs:84:5
[INFO] [stdout]    |
[INFO] [stdout] 84 |     s.send(LightMsg::ChangeColor(23, 24, 50));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 84 |     let _ = s.send(LightMsg::ChangeColor(23, 24, 50));
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/a39.rs:85:5
[INFO] [stdout]    |
[INFO] [stdout] 85 |     s.send(LightMsg::ChangeColor(255, 255, 255));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 85 |     let _ = s.send(LightMsg::ChangeColor(255, 255, 255));
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/a39.rs:86:5
[INFO] [stdout]    |
[INFO] [stdout] 86 |     s.send(LightMsg::ChangeColor(23, 88, 233));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let _ = s.send(LightMsg::ChangeColor(23, 88, 233));
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/a39.rs:87:5
[INFO] [stdout]    |
[INFO] [stdout] 87 |     s.send(LightMsg::Disconnect);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let _ = s.send(LightMsg::Disconnect);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/a39.rs:88:5
[INFO] [stdout]    |
[INFO] [stdout] 88 |     s.send(LightMsg::Off);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 88 |     let _ = s.send(LightMsg::Off);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.08s
[INFO] running `Command { std: "docker" "inspect" "fffbff5b8417a728af5f3fbd98951cc0e43be1c424d71c4fc439daf574b55135", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fffbff5b8417a728af5f3fbd98951cc0e43be1c424d71c4fc439daf574b55135", kill_on_drop: false }`
[INFO] [stdout] fffbff5b8417a728af5f3fbd98951cc0e43be1c424d71c4fc439daf574b55135