[INFO] cloning repository https://github.com/SergeevPavel/adventofcode2021
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/SergeevPavel/adventofcode2021" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSergeevPavel%2Fadventofcode2021", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSergeevPavel%2Fadventofcode2021'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 45477fa6f9ed2b12325aab36afc67ca4c26c3eaf
[INFO] checking SergeevPavel/adventofcode2021 against master#8f359beca4e58bc3ae795a666301a8f47023044c for pr-121557
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSergeevPavel%2Fadventofcode2021" "/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/SergeevPavel/adventofcode2021 on toolchain 8f359beca4e58bc3ae795a666301a8f47023044c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8f359beca4e58bc3ae795a666301a8f47023044c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/SergeevPavel/adventofcode2021
[INFO] finished tweaking git repo https://github.com/SergeevPavel/adventofcode2021
[INFO] tweaked toml for git repo https://github.com/SergeevPavel/adventofcode2021 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/SergeevPavel/adventofcode2021 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" "+8f359beca4e58bc3ae795a666301a8f47023044c" "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 SergeevPavel/adventofcode2021 against try#80d5fe37e16a0befb4128414cb6a11d544788c0a for pr-121557
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSergeevPavel%2Fadventofcode2021" "/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/SergeevPavel/adventofcode2021 on toolchain 80d5fe37e16a0befb4128414cb6a11d544788c0a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/SergeevPavel/adventofcode2021
[INFO] finished tweaking git repo https://github.com/SergeevPavel/adventofcode2021
[INFO] tweaked toml for git repo https://github.com/SergeevPavel/adventofcode2021 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/SergeevPavel/adventofcode2021 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" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "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
[ERROR] error running command: no output for 300 seconds
[INFO] checking SergeevPavel/adventofcode2021 against try#80d5fe37e16a0befb4128414cb6a11d544788c0a for pr-121557
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSergeevPavel%2Fadventofcode2021" "/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/SergeevPavel/adventofcode2021 on toolchain 80d5fe37e16a0befb4128414cb6a11d544788c0a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/SergeevPavel/adventofcode2021
[INFO] finished tweaking git repo https://github.com/SergeevPavel/adventofcode2021
[INFO] tweaked toml for git repo https://github.com/SergeevPavel/adventofcode2021 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/SergeevPavel/adventofcode2021 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" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3807b6f4610b355a052ef251a1aa249cd9aa9dd968092060fa038f1c8cbdc828
[INFO] running `Command { std: "docker" "start" "-a" "3807b6f4610b355a052ef251a1aa249cd9aa9dd968092060fa038f1c8cbdc828", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3807b6f4610b355a052ef251a1aa249cd9aa9dd968092060fa038f1c8cbdc828", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3807b6f4610b355a052ef251a1aa249cd9aa9dd968092060fa038f1c8cbdc828", kill_on_drop: false }`
[INFO] [stdout] 3807b6f4610b355a052ef251a1aa249cd9aa9dd968092060fa038f1c8cbdc828
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cadbfae34ec3540fcb08b58a5052a6d11342210a28670752421494f84f4ebcd0
[INFO] running `Command { std: "docker" "start" "-a" "cadbfae34ec3540fcb08b58a5052a6d11342210a28670752421494f84f4ebcd0", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.112
[INFO] [stderr]     Checking numtoa v0.1.0
[INFO] [stderr]     Checking itertools v0.10.1
[INFO] [stderr]     Checking termion v1.5.6
[INFO] [stderr]     Checking adventofcode2021 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `ops::Range`
[INFO] [stdout]  --> src/day05.rs:1:24
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{io::BufRead, ops::Range};
[INFO] [stdout]   |                        ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k`
[INFO] [stdout]   --> src/day05.rs:84:64
[INFO] [stdout]    |
[INFO] [stdout] 84 |     println!("result1 : {:?}", points.counts().iter().filter(|(k, v)| **v > 1).count());
[INFO] [stdout]    |                                                                ^ help: if this is intentional, prefix it with an underscore: `_k`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `st`
[INFO] [stdout]    --> src/day11.rs:123:9
[INFO] [stdout]     |
[INFO] [stdout] 123 |     for st in 1..=100 {
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_st`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task1` is never used
[INFO] [stdout]    --> src/day11.rs:119:4
[INFO] [stdout]     |
[INFO] [stdout] 119 | fn task1() {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k`
[INFO] [stdout]   --> src/day05.rs:92:64
[INFO] [stdout]    |
[INFO] [stdout] 92 |     println!("result2 : {:?}", points.counts().iter().filter(|(k, v)| **v > 1).count());
[INFO] [stdout]    |                                                                ^ help: if this is intentional, prefix it with an underscore: `_k`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> src/day18.rs:80:35
[INFO] [stdout]    |
[INFO] [stdout] 80 |                 Element::Number { n } => {},
[INFO] [stdout]    |                                   ^ help: try ignoring the field: `n: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `io::BufRead`
[INFO] [stdout]  --> src/day03a.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{io::BufRead, collections::HashMap};
[INFO] [stdout]   |           ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]   --> src/day06.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     for d in 0..days_count {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `io::BufRead`
[INFO] [stdout]  --> src/day03a.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{io::BufRead, collections::HashMap};
[INFO] [stdout]   |           ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]   --> src/day06.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     for d in 0..days_count {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `st`
[INFO] [stdout]    --> src/day11.rs:123:9
[INFO] [stdout]     |
[INFO] [stdout] 123 |     for st in 1..=100 {
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_st`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task1` is never used
[INFO] [stdout]    --> src/day11.rs:119:4
[INFO] [stdout]     |
[INFO] [stdout] 119 | fn task1() {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `edges` is never read
[INFO] [stdout]  --> src/day12.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Task {
[INFO] [stdout]   |        ---- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 7 |     edges: Vec<(String, String)>,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Task` 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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> src/day18.rs:80:35
[INFO] [stdout]    |
[INFO] [stdout] 80 |                 Element::Number { n } => {},
[INFO] [stdout]    |                                   ^ help: try ignoring the field: `n: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/day09.rs:123:9
[INFO] [stdout]     |
[INFO] [stdout] 123 |     let mut result = iproduct!(0..field.width, 0..field.height)
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/day09.rs:123:9
[INFO] [stdout]     |
[INFO] [stdout] 123 |     let mut result = iproduct!(0..field.width, 0..field.height)
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `step`
[INFO] [stdout]   --> src/day14.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     for step in 0..steps {
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_step`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ops::Range`
[INFO] [stdout]  --> src/day05.rs:1:24
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{io::BufRead, ops::Range};
[INFO] [stdout]   |                        ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `step`
[INFO] [stdout]   --> src/day14.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     for step in 0..steps {
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_step`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `apply` is never used
[INFO] [stdout]   --> src/day14.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn apply(s: String, productions: &HashMap<Pattern, char>) -> String {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `part1` is never used
[INFO] [stdout]   --> src/day14.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn part1(steps: usize) -> usize {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k`
[INFO] [stdout]   --> src/day05.rs:84:64
[INFO] [stdout]    |
[INFO] [stdout] 84 |     println!("result1 : {:?}", points.counts().iter().filter(|(k, v)| **v > 1).count());
[INFO] [stdout]    |                                                                ^ help: if this is intentional, prefix it with an underscore: `_k`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k`
[INFO] [stdout]   --> src/day05.rs:92:64
[INFO] [stdout]    |
[INFO] [stdout] 92 |     println!("result2 : {:?}", points.counts().iter().filter(|(k, v)| **v > 1).count());
[INFO] [stdout]    |                                                                ^ help: if this is intentional, prefix it with an underscore: `_k`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task1` is never used
[INFO] [stdout]   --> src/day08.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn task1() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `step`
[INFO] [stdout]   --> src/day14.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     for step in 0..steps {
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_step`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `step`
[INFO] [stdout]   --> src/day14.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     for step in 0..steps {
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_step`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `apply` is never used
[INFO] [stdout]   --> src/day14.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn apply(s: String, productions: &HashMap<Pattern, char>) -> String {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `part1` is never used
[INFO] [stdout]   --> src/day14.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn part1(steps: usize) -> usize {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task1` is never used
[INFO] [stdout]   --> src/day08.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn task1() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `edges` is never read
[INFO] [stdout]  --> src/day12.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Task {
[INFO] [stdout]   |        ---- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 7 |     edges: Vec<(String, String)>,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Task` 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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.96s
[INFO] running `Command { std: "docker" "inspect" "cadbfae34ec3540fcb08b58a5052a6d11342210a28670752421494f84f4ebcd0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cadbfae34ec3540fcb08b58a5052a6d11342210a28670752421494f84f4ebcd0", kill_on_drop: false }`
[INFO] [stdout] cadbfae34ec3540fcb08b58a5052a6d11342210a28670752421494f84f4ebcd0