[INFO] cloning repository https://github.com/iovis/aoc2023
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/iovis/aoc2023" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiovis%2Faoc2023", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiovis%2Faoc2023'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2e546726d3608bd11952ad1a4b5560c6df0a3353
[INFO] checking iovis/aoc2023 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiovis%2Faoc2023" "/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/iovis/aoc2023 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/iovis/aoc2023
[INFO] finished tweaking git repo https://github.com/iovis/aoc2023
[INFO] tweaked toml for git repo https://github.com/iovis/aoc2023 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/iovis/aoc2023 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] baaf0b5f35f183bb8f0b74e4a29a739bb88f80001b8690073dcc0c9d9ee3c13e
[INFO] running `Command { std: "docker" "start" "-a" "baaf0b5f35f183bb8f0b74e4a29a739bb88f80001b8690073dcc0c9d9ee3c13e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "baaf0b5f35f183bb8f0b74e4a29a739bb88f80001b8690073dcc0c9d9ee3c13e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "baaf0b5f35f183bb8f0b74e4a29a739bb88f80001b8690073dcc0c9d9ee3c13e", kill_on_drop: false }`
[INFO] [stdout] baaf0b5f35f183bb8f0b74e4a29a739bb88f80001b8690073dcc0c9d9ee3c13e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8e21e606fd9ebde8b57b0ded4ea1a5087a6c67652e05a233dc4c2d91b04bd6ad
[INFO] running `Command { std: "docker" "start" "-a" "8e21e606fd9ebde8b57b0ded4ea1a5087a6c67652e05a233dc4c2d91b04bd6ad", kill_on_drop: false }`
[INFO] [stderr]     Checking nom v7.1.3
[INFO] [stderr]    Compiling indoc v2.0.4
[INFO] [stderr]    Compiling crossbeam-utils v0.8.16
[INFO] [stderr]    Compiling rayon-core v1.12.0
[INFO] [stderr]    Compiling anyhow v1.0.75
[INFO] [stderr]     Checking aho-corasick v1.1.2
[INFO] [stderr]     Checking day3 v0.1.0 (/opt/rustwide/workdir/day3)
[INFO] [stderr]    Compiling memoffset v0.9.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.15
[INFO] [stderr]     Checking day11 v0.1.0 (/opt/rustwide/workdir/day11)
[INFO] [stderr]     Checking day13 v0.1.0 (/opt/rustwide/workdir/day13)
[INFO] [stdout] warning: value assigned to `number_start` is never read
[INFO] [stdout]    --> day3/src/main.rs:102:21
[INFO] [stdout]     |
[INFO] [stdout] 102 |             let mut number_start = None;
[INFO] [stdout]     |                     ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `number_end` is never read
[INFO] [stdout]    --> day3/src/main.rs:103:21
[INFO] [stdout]     |
[INFO] [stdout] 103 |             let mut number_end = None;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::str::from_utf8`
[INFO] [stdout]  --> day13/src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::str::from_utf8;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> day11/src/main.rs:95:9
[INFO] [stdout]    |
[INFO] [stdout] 95 |     let mut map = input
[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: function `print` is never used
[INFO] [stdout]    --> day11/src/main.rs:166:4
[INFO] [stdout]     |
[INFO] [stdout] 166 | fn print(map: &[Vec<u8>]) {
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `number_start` is never read
[INFO] [stdout]    --> day3/src/main.rs:102:21
[INFO] [stdout]     |
[INFO] [stdout] 102 |             let mut number_start = None;
[INFO] [stdout]     |                     ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `number_end` is never read
[INFO] [stdout]    --> day3/src/main.rs:103:21
[INFO] [stdout]     |
[INFO] [stdout] 103 |             let mut number_end = None;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::str::from_utf8`
[INFO] [stdout]  --> day13/src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::str::from_utf8;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[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]   --> day11/src/main.rs:95:9
[INFO] [stdout]    |
[INFO] [stdout] 95 |     let mut map = input
[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: function `print` is never used
[INFO] [stdout]    --> day11/src/main.rs:166:4
[INFO] [stdout]     |
[INFO] [stdout] 166 | fn print(map: &[Vec<u8>]) {
[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] [stderr]     Checking crossbeam-deque v0.8.3
[INFO] [stderr]     Checking regex-automata v0.4.3
[INFO] [stderr]     Checking rayon v1.8.0
[INFO] [stderr]     Checking day2 v0.1.0 (/opt/rustwide/workdir/day2)
[INFO] [stderr]     Checking day7 v0.1.0 (/opt/rustwide/workdir/day7)
[INFO] [stderr]     Checking day4 v0.1.0 (/opt/rustwide/workdir/day4)
[INFO] [stderr]     Checking day1 v0.1.0 (/opt/rustwide/workdir/day1)
[INFO] [stderr]     Checking day10 v0.1.0 (/opt/rustwide/workdir/day10)
[INFO] [stderr]     Checking day8 v0.1.0 (/opt/rustwide/workdir/day8)
[INFO] [stderr]     Checking day6 v0.1.0 (/opt/rustwide/workdir/day6)
[INFO] [stderr]     Checking day9 v0.1.0 (/opt/rustwide/workdir/day9)
[INFO] [stdout] warning: the item `IntoIterator` is imported redundantly
[INFO] [stdout]  --> day1/src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::iter::IntoIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `IntoIterator` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `IntoIterator` is imported redundantly
[INFO] [stdout]  --> day1/src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::iter::IntoIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `IntoIterator` is already defined here
[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: function `print` is never used
[INFO] [stdout]    --> day10/src/main.rs:276:4
[INFO] [stdout]     |
[INFO] [stdout] 276 | fn print(map: &[Vec<Node>]) {
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print` is never used
[INFO] [stdout]    --> day10/src/main.rs:276:4
[INFO] [stdout]     |
[INFO] [stdout] 276 | fn print(map: &[Vec<Node>]) {
[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: function `p1` is never used
[INFO] [stdout]   --> day7/src/main.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn p1(input: &str) -> u64 {
[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: function `p1` is never used
[INFO] [stdout]   --> day7/src/main.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn p1(input: &str) -> u64 {
[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] [stderr]     Checking day5 v0.1.0 (/opt/rustwide/workdir/day5)
[INFO] [stderr]     Checking regex v1.10.2
[INFO] [stderr]     Checking day12 v0.1.0 (/opt/rustwide/workdir/day12)
[INFO] [stdout] warning: unused import: `FromParallelIterator`
[INFO] [stdout]  --> day12/src/main.rs:2:22
[INFO] [stdout]   |
[INFO] [stdout] 2 | use rayon::prelude::{FromParallelIterator, ParallelBridge, ParallelIterator};
[INFO] [stdout]   |                      ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `FromParallelIterator`
[INFO] [stdout]  --> day12/src/main.rs:2:22
[INFO] [stdout]   |
[INFO] [stdout] 2 | use rayon::prelude::{FromParallelIterator, ParallelBridge, ParallelIterator};
[INFO] [stdout]   |                      ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `input`
[INFO] [stdout]  --> day12/src/main.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let input = include_str!("input.txt");
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_input`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `valid`
[INFO] [stdout]   --> day12/src/main.rs:53:21
[INFO] [stdout]    |
[INFO] [stdout] 53 |             let mut valid = 0;
[INFO] [stdout]    |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_valid`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> day12/src/main.rs:52:16
[INFO] [stdout]    |
[INFO] [stdout] 52 |         .map(|(mut symbols, mut matches, results)| {
[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: variable does not need to be mutable
[INFO] [stdout]   --> day12/src/main.rs:53:17
[INFO] [stdout]    |
[INFO] [stdout] 53 |             let mut valid = 0;
[INFO] [stdout]    |                 ----^^^^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `valid`
[INFO] [stdout]    --> day12/src/main.rs:101:21
[INFO] [stdout]     |
[INFO] [stdout] 101 |             let mut valid = 0;
[INFO] [stdout]     |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_valid`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> day12/src/main.rs:99:16
[INFO] [stdout]    |
[INFO] [stdout] 99 |         .map(|(mut symbols, results)| {
[INFO] [stdout]    |                ----^^^^^^^
[INFO] [stdout]    |                |
[INFO] [stdout]    |                help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> day12/src/main.rs:101:17
[INFO] [stdout]     |
[INFO] [stdout] 101 |             let mut valid = 0;
[INFO] [stdout]     |                 ----^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> day12/src/main.rs:120:5
[INFO] [stdout]     |
[INFO] [stdout] 120 |     mut string: &mut [u8],
[INFO] [stdout]     |     ----^^^^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> day12/src/main.rs:126:5
[INFO] [stdout]     |
[INFO] [stdout] 126 |     mut valid: &mut usize,
[INFO] [stdout]     |     ----^^^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_numbers` is never used
[INFO] [stdout]  --> day12/src/parser.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn parse_numbers(input: &str) -> IResult<&str, Vec<u64>> {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `input`
[INFO] [stdout]  --> day12/src/main.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let input = include_str!("input.txt");
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_input`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `valid`
[INFO] [stdout]   --> day12/src/main.rs:53:21
[INFO] [stdout]    |
[INFO] [stdout] 53 |             let mut valid = 0;
[INFO] [stdout]    |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_valid`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> day12/src/main.rs:52:16
[INFO] [stdout]    |
[INFO] [stdout] 52 |         .map(|(mut symbols, mut matches, results)| {
[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: variable does not need to be mutable
[INFO] [stdout]   --> day12/src/main.rs:53:17
[INFO] [stdout]    |
[INFO] [stdout] 53 |             let mut valid = 0;
[INFO] [stdout]    |                 ----^^^^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `valid`
[INFO] [stdout]    --> day12/src/main.rs:101:21
[INFO] [stdout]     |
[INFO] [stdout] 101 |             let mut valid = 0;
[INFO] [stdout]     |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_valid`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> day12/src/main.rs:99:16
[INFO] [stdout]    |
[INFO] [stdout] 99 |         .map(|(mut symbols, results)| {
[INFO] [stdout]    |                ----^^^^^^^
[INFO] [stdout]    |                |
[INFO] [stdout]    |                help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> day12/src/main.rs:101:17
[INFO] [stdout]     |
[INFO] [stdout] 101 |             let mut valid = 0;
[INFO] [stdout]     |                 ----^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> day12/src/main.rs:120:5
[INFO] [stdout]     |
[INFO] [stdout] 120 |     mut string: &mut [u8],
[INFO] [stdout]     |     ----^^^^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> day12/src/main.rs:126:5
[INFO] [stdout]     |
[INFO] [stdout] 126 |     mut valid: &mut usize,
[INFO] [stdout]     |     ----^^^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.24s
[INFO] running `Command { std: "docker" "inspect" "8e21e606fd9ebde8b57b0ded4ea1a5087a6c67652e05a233dc4c2d91b04bd6ad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8e21e606fd9ebde8b57b0ded4ea1a5087a6c67652e05a233dc4c2d91b04bd6ad", kill_on_drop: false }`
[INFO] [stdout] 8e21e606fd9ebde8b57b0ded4ea1a5087a6c67652e05a233dc4c2d91b04bd6ad