[INFO] cloning repository https://github.com/timmy-feng/flow-solver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/timmy-feng/flow-solver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftimmy-feng%2Fflow-solver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftimmy-feng%2Fflow-solver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 76c1aad7be2a6dbdf4916fb46d396f3496cd2f18
[INFO] checking timmy-feng/flow-solver against try#342ed2e8608ee307743c341962b427652cdb06e9 for pr-146562
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftimmy-feng%2Fflow-solver" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/timmy-feng/flow-solver
[INFO] finished tweaking git repo https://github.com/timmy-feng/flow-solver
[INFO] tweaked toml for git repo https://github.com/timmy-feng/flow-solver written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/timmy-feng/flow-solver on toolchain 342ed2e8608ee307743c341962b427652cdb06e9
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+342ed2e8608ee307743c341962b427652cdb06e9" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/timmy-feng/flow-solver 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" "+342ed2e8608ee307743c341962b427652cdb06e9" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking timmy-feng/flow-solver against try#342ed2e8608ee307743c341962b427652cdb06e9 for pr-146562
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftimmy-feng%2Fflow-solver" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/timmy-feng/flow-solver
[INFO] finished tweaking git repo https://github.com/timmy-feng/flow-solver
[INFO] tweaked toml for git repo https://github.com/timmy-feng/flow-solver written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/timmy-feng/flow-solver on toolchain 342ed2e8608ee307743c341962b427652cdb06e9
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+342ed2e8608ee307743c341962b427652cdb06e9" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/timmy-feng/flow-solver 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" "+342ed2e8608ee307743c341962b427652cdb06e9" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded parking_lot_core v0.9.11
[INFO] [stderr]   Downloaded socket2 v0.5.8
[INFO] [stderr]   Downloaded tokio-macros v2.4.0
[INFO] [stderr]   Downloaded redox_syscall v0.5.17
[INFO] [stderr]   Downloaded signal-hook-registry v1.4.6
[INFO] [stderr]   Downloaded parking_lot v0.12.4
[INFO] [stderr]   Downloaded bitflags v2.9.3
[INFO] [stderr]   Downloaded serde_path_to_error v0.1.17
[INFO] [stderr]   Downloaded async-trait v0.1.89
[INFO] [stderr]   Downloaded rustc-demangle v0.1.26
[INFO] [stderr]   Downloaded axum-core v0.4.5
[INFO] [stderr]   Downloaded windows-targets v0.53.3
[INFO] [stderr]   Downloaded clap v4.5.45
[INFO] [stderr]   Downloaded axum v0.7.9
[INFO] [stderr]   Downloaded serde_json v1.0.143
[INFO] [stderr]   Downloaded http-range-header v0.4.2
[INFO] [stderr]   Downloaded clap_builder v4.5.44
[INFO] [stderr]   Downloaded mio v1.0.2
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[INFO] [stderr]   Downloaded cc v1.2.34
[INFO] [stderr]   Downloaded object v0.36.7
[INFO] [stderr]   Downloaded autocfg v1.5.0
[INFO] [stderr]   Downloaded hyper-util v0.1.16
[INFO] [stderr]   Downloaded gimli v0.29.0
[INFO] [stderr]   Downloaded backtrace v0.3.73
[INFO] [stderr]   Downloaded rustversion v1.0.22
[INFO] [stderr]   Downloaded windows-link v0.1.3
[INFO] [stderr]   Downloaded anstyle-wincon v3.0.10
[INFO] [stderr]   Downloaded clap_derive v4.5.45
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[INFO] [stderr]   Downloaded once_cell_polyfill v1.70.1
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[INFO] [stderr]   Downloaded lock_api v0.4.13
[INFO] [stderr]   Downloaded tokio v1.42.1
[INFO] [stderr]   Downloaded windows_x86_64_gnullvm v0.53.0
[INFO] [stderr]   Downloaded windows_x86_64_msvc v0.53.0
[INFO] [stderr]   Downloaded windows_aarch64_gnullvm v0.53.0
[INFO] [stderr]   Downloaded windows_x86_64_gnu v0.53.0
[INFO] [stderr]   Downloaded windows_i686_msvc v0.53.0
[INFO] [stderr]   Downloaded windows_i686_gnu v0.53.0
[INFO] [stderr]   Downloaded windows_aarch64_msvc v0.53.0
[INFO] [stderr]   Downloaded windows_i686_gnullvm v0.53.0
[INFO] [stderr]   Downloaded windows-sys v0.60.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+342ed2e8608ee307743c341962b427652cdb06e9" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8231b918bc3bbd2f8cb69f8512f1e39cfa969b9141be6fecbcdaefd880605412
[INFO] running `Command { std: "docker" "start" "-a" "8231b918bc3bbd2f8cb69f8512f1e39cfa969b9141be6fecbcdaefd880605412", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8231b918bc3bbd2f8cb69f8512f1e39cfa969b9141be6fecbcdaefd880605412", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8231b918bc3bbd2f8cb69f8512f1e39cfa969b9141be6fecbcdaefd880605412", kill_on_drop: false }`
[INFO] [stdout] 8231b918bc3bbd2f8cb69f8512f1e39cfa969b9141be6fecbcdaefd880605412
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+342ed2e8608ee307743c341962b427652cdb06e9" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7260bb052e0154f02c6869cf31248be227a7d98ff279df7073660ed3593eed42
[INFO] running `Command { std: "docker" "start" "-a" "7260bb052e0154f02c6869cf31248be227a7d98ff279df7073660ed3593eed42", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.101
[INFO] [stderr]    Compiling unicode-ident v1.0.18
[INFO] [stderr]    Compiling libc v0.2.151
[INFO] [stderr]     Checking itoa v1.0.15
[INFO] [stderr]    Compiling autocfg v1.5.0
[INFO] [stderr]     Checking bytes v1.10.1
[INFO] [stderr]     Checking pin-project-lite v0.2.16
[INFO] [stderr]    Compiling parking_lot_core v0.9.11
[INFO] [stderr]     Checking futures-core v0.3.31
[INFO] [stderr]     Checking smallvec v1.15.1
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]     Checking fnv v1.0.7
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking once_cell v1.21.3
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]     Checking tower-service v0.3.3
[INFO] [stderr]     Checking log v0.4.27
[INFO] [stderr]     Checking futures-task v0.3.31
[INFO] [stderr]    Compiling httparse v1.10.1
[INFO] [stderr]     Checking utf8parse v0.2.2
[INFO] [stderr]     Checking percent-encoding v2.3.2
[INFO] [stderr]    Compiling unicase v2.8.1
[INFO] [stderr]     Checking tower-layer v0.3.3
[INFO] [stderr]    Compiling rustversion v1.0.22
[INFO] [stderr]     Checking mime v0.3.17
[INFO] [stderr]     Checking httpdate v1.0.3
[INFO] [stderr]     Checking anstyle-parse v0.2.7
[INFO] [stderr]     Checking tracing-core v0.1.34
[INFO] [stderr]     Checking futures-util v0.3.31
[INFO] [stderr]    Compiling mime_guess v2.0.5
[INFO] [stderr]     Checking futures-channel v0.3.31
[INFO] [stderr]     Checking anstyle v1.0.11
[INFO] [stderr]     Checking is_terminal_polyfill v1.70.1
[INFO] [stderr]     Checking colorchoice v1.0.4
[INFO] [stderr]     Checking ryu v1.0.20
[INFO] [stderr]     Checking sync_wrapper v1.0.2
[INFO] [stderr]    Compiling serde_json v1.0.143
[INFO] [stderr]     Checking atomic-waker v1.1.2
[INFO] [stderr]     Checking http v1.3.1
[INFO] [stderr]     Checking anstyle-query v1.1.4
[INFO] [stderr]     Checking form_urlencoded v1.2.2
[INFO] [stderr]     Checking memchr v2.7.5
[INFO] [stderr]     Checking clap_lex v0.7.5
[INFO] [stderr]     Checking anstream v0.6.20
[INFO] [stderr]    Compiling lock_api v0.4.13
[INFO] [stderr]     Checking strsim v0.11.1
[INFO] [stderr]    Compiling heck v0.5.0
[INFO] [stderr]     Checking futures-sink v0.3.31
[INFO] [stderr]     Checking bitflags v2.9.3
[INFO] [stderr]     Checking http-range-header v0.4.2
[INFO] [stderr]     Checking matchit v0.7.3
[INFO] [stderr]     Checking clap_builder v4.5.44
[INFO] [stderr]     Checking tracing v0.1.41
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]     Checking http-body v1.0.1
[INFO] [stderr]     Checking http-body-util v0.1.3
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]     Checking mio v1.0.2
[INFO] [stderr]     Checking socket2 v0.5.8
[INFO] [stderr]     Checking signal-hook-registry v1.4.6
[INFO] [stderr]     Checking getrandom v0.2.11
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking parking_lot v0.12.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]    Compiling tokio-macros v2.4.0
[INFO] [stderr]    Compiling serde_derive v1.0.219
[INFO] [stderr]    Compiling async-trait v0.1.89
[INFO] [stderr]    Compiling clap_derive v4.5.45
[INFO] [stderr]     Checking tokio v1.42.1
[INFO] [stderr]     Checking axum-core v0.4.5
[INFO] [stderr]     Checking clap v4.5.45
[INFO] [stderr]     Checking hyper v1.7.0
[INFO] [stderr]     Checking tower v0.5.2
[INFO] [stderr]     Checking tokio-util v0.7.16
[INFO] [stderr]     Checking tower-http v0.5.2
[INFO] [stderr]     Checking serde_path_to_error v0.1.17
[INFO] [stderr]     Checking serde_urlencoded v0.7.1
[INFO] [stderr]     Checking hyper-util v0.1.16
[INFO] [stderr]     Checking axum v0.7.9
[INFO] [stderr]     Checking flow_solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `oth`
[INFO] [stdout]  --> src/gen.rs:7:20
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn unite(self, oth: Self, u: usize, v: usize) -> Option<Self> { Some(Dummy()) }
[INFO] [stdout]   |                    ^^^ help: if this is intentional, prefix it with an underscore: `_oth`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `oth`
[INFO] [stdout]  --> src/gen.rs:7:20
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn unite(self, oth: Self, u: usize, v: usize) -> Option<Self> { Some(Dummy()) }
[INFO] [stdout]   |                    ^^^ help: if this is intentional, prefix it with an underscore: `_oth`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]  --> src/gen.rs:7:31
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn unite(self, oth: Self, u: usize, v: usize) -> Option<Self> { Some(Dummy()) }
[INFO] [stdout]   |                               ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]  --> src/gen.rs:7:31
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn unite(self, oth: Self, u: usize, v: usize) -> Option<Self> { Some(Dummy()) }
[INFO] [stdout]   |                               ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]  --> src/gen.rs:7:41
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn unite(self, oth: Self, u: usize, v: usize) -> Option<Self> { Some(Dummy()) }
[INFO] [stdout]   |                                         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]  --> src/gen.rs:7:41
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn unite(self, oth: Self, u: usize, v: usize) -> Option<Self> { Some(Dummy()) }
[INFO] [stdout]   |                                         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `hash_multiplier` is never read
[INFO] [stdout]   --> src/search/mod.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub struct SearchFlow {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 33 |     hash_multiplier: Vec<Modnum>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SearchFlow` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_degree` is never used
[INFO] [stdout]    --> src/search/mod.rs:107:8
[INFO] [stdout]     |
[INFO] [stdout]  38 | impl SearchFlow {
[INFO] [stdout]     | --------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 107 |     fn get_degree(&self, u: usize) -> usize {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `hash_multiplier` is never read
[INFO] [stdout]   --> src/search/mod.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub struct SearchFlow {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 33 |     hash_multiplier: Vec<Modnum>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SearchFlow` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_degree` is never used
[INFO] [stdout]    --> src/search/mod.rs:107:8
[INFO] [stdout]     |
[INFO] [stdout]  38 | impl SearchFlow {
[INFO] [stdout]     | --------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 107 |     fn get_degree(&self, u: usize) -> usize {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `collections::HashSet` and `time::Instant`
[INFO] [stdout]  --> src/main.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{time::Instant, collections::HashSet};
[INFO] [stdout]   |           ^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `collections::HashSet` and `time::Instant`
[INFO] [stdout]  --> src/main.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{time::Instant, collections::HashSet};
[INFO] [stdout]   |           ^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `it`
[INFO] [stdout]   --> src/main.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     for it in 0..16 {
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_it`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `h`
[INFO] [stdout]   --> src/main.rs:67:14
[INFO] [stdout]    |
[INFO] [stdout] 67 |         let (h, w, down, right) = {
[INFO] [stdout]    |              ^ help: if this is intentional, prefix it with an underscore: `_h`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `w`
[INFO] [stdout]   --> src/main.rs:67:17
[INFO] [stdout]    |
[INFO] [stdout] 67 |         let (h, w, down, right) = {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_w`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `down`
[INFO] [stdout]   --> src/main.rs:67:20
[INFO] [stdout]    |
[INFO] [stdout] 67 |         let (h, w, down, right) = {
[INFO] [stdout]    |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_down`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `right`
[INFO] [stdout]   --> src/main.rs:67:26
[INFO] [stdout]    |
[INFO] [stdout] 67 |         let (h, w, down, right) = {
[INFO] [stdout]    |                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_right`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `it`
[INFO] [stdout]   --> src/main.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     for it in 0..16 {
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_it`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `h`
[INFO] [stdout]   --> src/main.rs:67:14
[INFO] [stdout]    |
[INFO] [stdout] 67 |         let (h, w, down, right) = {
[INFO] [stdout]    |              ^ help: if this is intentional, prefix it with an underscore: `_h`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `w`
[INFO] [stdout]   --> src/main.rs:67:17
[INFO] [stdout]    |
[INFO] [stdout] 67 |         let (h, w, down, right) = {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_w`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:59:9
[INFO] [stdout]    |
[INFO] [stdout] 59 |     let mut board: Vec<Vec<usize>> = input.lines().map(|line| {
[INFO] [stdout]    |         ----^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `down`
[INFO] [stdout]   --> src/main.rs:67:20
[INFO] [stdout]    |
[INFO] [stdout] 67 |         let (h, w, down, right) = {
[INFO] [stdout]    |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_down`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `right`
[INFO] [stdout]   --> src/main.rs:67:26
[INFO] [stdout]    |
[INFO] [stdout] 67 |         let (h, w, down, right) = {
[INFO] [stdout]    |                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_right`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:59:9
[INFO] [stdout]    |
[INFO] [stdout] 59 |     let mut board: Vec<Vec<usize>> = input.lines().map(|line| {
[INFO] [stdout]    |         ----^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.61s
[INFO] running `Command { std: "docker" "inspect" "7260bb052e0154f02c6869cf31248be227a7d98ff279df7073660ed3593eed42", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7260bb052e0154f02c6869cf31248be227a7d98ff279df7073660ed3593eed42", kill_on_drop: false }`
[INFO] [stdout] 7260bb052e0154f02c6869cf31248be227a7d98ff279df7073660ed3593eed42