[INFO] cloning repository https://github.com/mahulst/advent-of-code-2018
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mahulst/advent-of-code-2018" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmahulst%2Fadvent-of-code-2018", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmahulst%2Fadvent-of-code-2018'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a3bf9a630b126ac2cd285b0d69db8383953ccdd4
[INFO] checking mahulst/advent-of-code-2018 against beta-2021-10-15 for beta-1.56-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmahulst%2Fadvent-of-code-2018" "/workspace/builds/worker-95/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-95/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mahulst/advent-of-code-2018 on toolchain beta-2021-10-15
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-10-15" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mahulst/advent-of-code-2018
[INFO] finished tweaking git repo https://github.com/mahulst/advent-of-code-2018
[INFO] tweaked toml for git repo https://github.com/mahulst/advent-of-code-2018 written to /workspace/builds/worker-95/source/Cargo.toml
[INFO] crate git repo https://github.com/mahulst/advent-of-code-2018 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-10-15" "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-95/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-10-15" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9f06e854996c6c75d602ae85ee4fcefe0335c0c2869bb60965972ec0bfaad305
[INFO] running `Command { std: "docker" "start" "-a" "9f06e854996c6c75d602ae85ee4fcefe0335c0c2869bb60965972ec0bfaad305", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9f06e854996c6c75d602ae85ee4fcefe0335c0c2869bb60965972ec0bfaad305", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f06e854996c6c75d602ae85ee4fcefe0335c0c2869bb60965972ec0bfaad305", kill_on_drop: false }`
[INFO] [stdout] 9f06e854996c6c75d602ae85ee4fcefe0335c0c2869bb60965972ec0bfaad305
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-95/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-10-15" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9968dee669fc3171c64bd070d38db901faae97edcb7a45309ba411eb68a7cc50
[INFO] running `Command { std: "docker" "start" "-a" "9968dee669fc3171c64bd070d38db901faae97edcb7a45309ba411eb68a7cc50", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.44
[INFO] [stderr]     Checking cfg-if v0.1.6
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling regex v1.1.0
[INFO] [stderr]     Checking ucd-util v0.1.3
[INFO] [stderr]     Checking utf8-ranges v1.0.2
[INFO] [stderr]     Checking nodrop v0.1.13
[INFO] [stderr]     Checking memoffset v0.2.1
[INFO] [stderr]     Checking scopeguard v0.3.3
[INFO] [stderr]    Compiling rayon-core v1.4.1
[INFO] [stderr]    Compiling rayon v1.0.3
[INFO] [stderr]    Compiling num-traits v0.2.6
[INFO] [stderr]     Checking rand_core v0.3.0
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]     Checking either v1.5.0
[INFO] [stderr]     Checking linked-list v0.0.3
[INFO] [stderr]     Checking day13 v0.1.0 (/opt/rustwide/workdir/day13)
[INFO] [stderr]     Checking day1 v0.1.0 (/opt/rustwide/workdir/day1)
[INFO] [stderr]     Checking day11 v0.1.0 (/opt/rustwide/workdir/day11)
[INFO] [stderr]     Checking day8 v0.1.0 (/opt/rustwide/workdir/day8)
[INFO] [stderr]     Checking day2 v0.1.0 (/opt/rustwide/workdir/day2)
[INFO] [stderr]     Checking day14 v0.1.0 (/opt/rustwide/workdir/day14)
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]  --> day13/src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::thread;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::time`
[INFO] [stdout]  --> day13/src/lib.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use core::time;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r`
[INFO] [stdout]   --> day14/src/lib.rs:77:17
[INFO] [stdout]    |
[INFO] [stdout] 77 |     if let Some(r) = recipes.windows(window_size).find(|slice| {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_r`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r`
[INFO] [stdout]   --> day14/src/lib.rs:77:17
[INFO] [stdout]    |
[INFO] [stdout] 77 |     if let Some(r) = recipes.windows(window_size).find(|slice| {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_r`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `i` is assigned to, but never used
[INFO] [stdout]    --> day13/src/lib.rs:272:13
[INFO] [stdout]     |
[INFO] [stdout] 272 |     let mut i = 0;
[INFO] [stdout]     |             ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]     = note: consider using `_i` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `collision`
[INFO] [stdout]    --> day13/src/lib.rs:292:13
[INFO] [stdout]     |
[INFO] [stdout] 292 |         let collision = move_carts(&empty_tracks, carts);
[INFO] [stdout]     |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_collision`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> day14/src/lib.rs:92:13
[INFO] [stdout]    |
[INFO] [stdout] 92 |         let mut recipes = vec![3, 7];
[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]    --> day14/src/lib.rs:104:13
[INFO] [stdout]     |
[INFO] [stdout] 104 |         let mut recipes = vec![3, 7, 0, 1, 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]    --> day13/src/lib.rs:274:9
[INFO] [stdout]     |
[INFO] [stdout] 274 |     let mut done = false;
[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: unused import: `std::thread`
[INFO] [stdout]  --> day13/src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::thread;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::time`
[INFO] [stdout]  --> day13/src/lib.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use core::time;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `i` is assigned to, but never used
[INFO] [stdout]    --> day13/src/lib.rs:272:13
[INFO] [stdout]     |
[INFO] [stdout] 272 |     let mut i = 0;
[INFO] [stdout]     |             ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]     = note: consider using `_i` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `collision`
[INFO] [stdout]    --> day13/src/lib.rs:292:13
[INFO] [stdout]     |
[INFO] [stdout] 292 |         let collision = move_carts(&empty_tracks, carts);
[INFO] [stdout]     |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_collision`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> day13/src/lib.rs:274:9
[INFO] [stdout]     |
[INFO] [stdout] 274 |     let mut done = false;
[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] [stderr]     Checking arrayvec v0.4.8
[INFO] [stderr]     Checking crossbeam-utils v0.2.2
[INFO] [stdout] warning: 5 warnings emitted
[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] [stderr]     Checking regex-syntax v0.6.4
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking day9 v0.1.0 (/opt/rustwide/workdir/day9)
[INFO] [stderr]     Checking rand_core v0.2.2
[INFO] [stderr]    Compiling memchr v2.1.1
[INFO] [stderr]     Checking crossbeam-epoch v0.3.1
[INFO] [stderr]     Checking num_cpus v1.8.0
[INFO] [stderr]     Checking time v0.1.40
[INFO] [stderr]     Checking rand v0.5.5
[INFO] [stderr]     Checking crossbeam-deque v0.2.0
[INFO] [stderr]     Checking aho-corasick v0.6.9
[INFO] [stderr]     Checking chrono v0.4.6
[INFO] [stderr]     Checking uuid v0.7.1
[INFO] [stderr]     Checking day12 v0.1.0 (/opt/rustwide/workdir/day12)
[INFO] [stderr]     Checking day16 v0.1.0 (/opt/rustwide/workdir/day16)
[INFO] [stderr]     Checking day7 v0.1.0 (/opt/rustwide/workdir/day7)
[INFO] [stderr]     Checking day3 v0.1.0 (/opt/rustwide/workdir/day3)
[INFO] [stderr]     Checking day10 v0.1.0 (/opt/rustwide/workdir/day10)
[INFO] [stderr]     Checking day6 v0.1.0 (/opt/rustwide/workdir/day6)
[INFO] [stderr]     Checking day4 v0.1.0 (/opt/rustwide/workdir/day4)
[INFO] [stdout] warning: use of deprecated constant `std::sync::atomic::ATOMIC_USIZE_INIT`: the `new` function is now preferred
[INFO] [stdout]   --> day6/src/lib.rs:11:46
[INFO] [stdout]    |
[INFO] [stdout] 11 | static OBJECT_COUNTER: AtomicUsize = atomic::ATOMIC_USIZE_INIT;
[INFO] [stdout]    |                                              ^^^^^^^^^^^^^^^^^ help: replace the use of the deprecated constant: `AtomicUsize::new(0)`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> day3/src/lib.rs:92:34
[INFO] [stdout]    |
[INFO] [stdout] 92 |         plot_square(&mut fabric, claim);
[INFO] [stdout]    |                                  ^^^^^
[INFO] [stdout]    |                                  |
[INFO] [stdout]    |                                  expected `&Claim`, found struct `Claim`
[INFO] [stdout]    |                                  help: consider borrowing here: `&claim`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> day3/src/lib.rs:105:34
[INFO] [stdout]     |
[INFO] [stdout] 105 |         plot_square(&mut fabric, claim1);
[INFO] [stdout]     |                                  ^^^^^^
[INFO] [stdout]     |                                  |
[INFO] [stdout]     |                                  expected `&Claim`, found struct `Claim`
[INFO] [stdout]     |                                  help: consider borrowing here: `&claim1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> day3/src/lib.rs:106:34
[INFO] [stdout]     |
[INFO] [stdout] 106 |         plot_square(&mut fabric, claim2);
[INFO] [stdout]     |                                  ^^^^^^
[INFO] [stdout]     |                                  |
[INFO] [stdout]     |                                  expected `&Claim`, found struct `Claim`
[INFO] [stdout]     |                                  help: consider borrowing here: `&claim2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `events_to_sleep_info`
[INFO] [stdout]    --> day4/src/lib.rs:176:9
[INFO] [stdout]     |
[INFO] [stdout] 176 |     use events_to_sleep_info;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `day3` due to 4 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `datetime`
[INFO] [stdout]   --> day4/src/lib.rs:89:48
[INFO] [stdout]    |
[INFO] [stdout] 89 |                     GuardEvent::StartOfShift { datetime, id } => {
[INFO] [stdout]    |                                                ^^^^^^^^ help: try ignoring the field: `datetime: _`
[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]   --> day4/src/lib.rs:98:33
[INFO] [stdout]    |
[INFO] [stdout] 98 | ...                   let mut minute = minutes_asleep
[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: use of deprecated constant `std::sync::atomic::ATOMIC_USIZE_INIT`: the `new` function is now preferred
[INFO] [stdout]   --> day6/src/lib.rs:11:46
[INFO] [stdout]    |
[INFO] [stdout] 11 | static OBJECT_COUNTER: AtomicUsize = atomic::ATOMIC_USIZE_INIT;
[INFO] [stdout]    |                                              ^^^^^^^^^^^^^^^^^ help: replace the use of the deprecated constant: `AtomicUsize::new(0)`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `id`
[INFO] [stdout]    --> day16/src/lib.rs:194:43
[INFO] [stdout]     |
[INFO] [stdout] 194 |             let entry = map.iter().find(|(id, set)| {
[INFO] [stdout]     |                                           ^^ help: if this is intentional, prefix it with an underscore: `_id`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `id`
[INFO] [stdout]    --> day16/src/lib.rs:202:35
[INFO] [stdout]     |
[INFO] [stdout] 202 |         map.iter_mut().for_each(|(id, set)| {
[INFO] [stdout]     |                                   ^^ help: if this is intentional, prefix it with an underscore: `_id`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `function_id` is never read
[INFO] [stdout]    --> day16/src/lib.rs:191:17
[INFO] [stdout]     |
[INFO] [stdout] 191 |         let mut function_id: Vec<i32> = vec![];
[INFO] [stdout]     |                 ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `opcode_id` is never read
[INFO] [stdout]    --> day16/src/lib.rs:192:17
[INFO] [stdout]     |
[INFO] [stdout] 192 |         let mut opcode_id = -1;
[INFO] [stdout]     |                 ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `id`
[INFO] [stdout]    --> day16/src/lib.rs:194:43
[INFO] [stdout]     |
[INFO] [stdout] 194 |             let entry = map.iter().find(|(id, set)| {
[INFO] [stdout]     |                                           ^^ help: if this is intentional, prefix it with an underscore: `_id`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `id`
[INFO] [stdout]    --> day16/src/lib.rs:202:35
[INFO] [stdout]     |
[INFO] [stdout] 202 |         map.iter_mut().for_each(|(id, set)| {
[INFO] [stdout]     |                                   ^^ help: if this is intentional, prefix it with an underscore: `_id`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `function_id` is never read
[INFO] [stdout]    --> day16/src/lib.rs:191:17
[INFO] [stdout]     |
[INFO] [stdout] 191 |         let mut function_id: Vec<i32> = vec![];
[INFO] [stdout]     |                 ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `opcode_id` is never read
[INFO] [stdout]    --> day16/src/lib.rs:192:17
[INFO] [stdout]     |
[INFO] [stdout] 192 |         let mut opcode_id = -1;
[INFO] [stdout]     |                 ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[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: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> day4/src/lib.rs:188:21
[INFO] [stdout]     |
[INFO] [stdout] 188 |         sort_events(&mut events);
[INFO] [stdout]     |                     ^^^^^^^^^^^ expected enum `GuardEvent`, found `&GuardEvent`
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected mutable reference `&mut Vec<GuardEvent>`
[INFO] [stdout]                found mutable reference `&mut Vec<&GuardEvent>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "9968dee669fc3171c64bd070d38db901faae97edcb7a45309ba411eb68a7cc50", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9968dee669fc3171c64bd070d38db901faae97edcb7a45309ba411eb68a7cc50", kill_on_drop: false }`
[INFO] [stdout] 9968dee669fc3171c64bd070d38db901faae97edcb7a45309ba411eb68a7cc50
