[INFO] cloning repository https://github.com/errantsky/adventofcode-2017
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/errantsky/adventofcode-2017" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ferrantsky%2Fadventofcode-2017", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ferrantsky%2Fadventofcode-2017'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1a2d92f2213497e21cd7325c1a6923e8e58337fd
[INFO] checking errantsky/adventofcode-2017 against master#33fdb797f59421c7bbecaa4588ed5d7a31a9494a for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ferrantsky%2Fadventofcode-2017" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/errantsky/adventofcode-2017 on toolchain 33fdb797f59421c7bbecaa4588ed5d7a31a9494a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/errantsky/adventofcode-2017
[INFO] finished tweaking git repo https://github.com/errantsky/adventofcode-2017
[INFO] tweaked toml for git repo https://github.com/errantsky/adventofcode-2017 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/errantsky/adventofcode-2017 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e81acf358cab239753654ad2ff8bb103b03d5a16555c01c5b3ec64f8a7598fb5
[INFO] running `Command { std: "docker" "start" "-a" "e81acf358cab239753654ad2ff8bb103b03d5a16555c01c5b3ec64f8a7598fb5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e81acf358cab239753654ad2ff8bb103b03d5a16555c01c5b3ec64f8a7598fb5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e81acf358cab239753654ad2ff8bb103b03d5a16555c01c5b3ec64f8a7598fb5", kill_on_drop: false }`
[INFO] [stdout] e81acf358cab239753654ad2ff8bb103b03d5a16555c01c5b3ec64f8a7598fb5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 68db050086ec69ec5dc06a2f07643daed2a7837d820253537fda9e960ea21aa5
[INFO] running `Command { std: "docker" "start" "-a" "68db050086ec69ec5dc06a2f07643daed2a7837d820253537fda9e960ea21aa5", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking adventofcode-2017 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]   --> src/spiral_memory_3.rs:87:28
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let quadrant = mod_pos((p - zero), layer_len) / (2 * layer);
[INFO] [stdout]    |                            ^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fs::File`
[INFO] [stdout]  --> src/memory_realloc_6.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fs::File;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `BufRead`, `BufReader`
[INFO] [stdout]  --> src/memory_realloc_6.rs:2:15
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{BufReader, BufRead};
[INFO] [stdout]   |               ^^^^^^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `HashSet`
[INFO] [stdout]  --> src/memory_realloc_6.rs:3:24
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::{HashSet, HashMap};
[INFO] [stdout]   |                        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `BufRead`
[INFO] [stdout]  --> src/registers_8.rs:1:33
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::io::{Lines, BufReader, BufRead};
[INFO] [stdout]   |                                 ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `BufRead`, `BufReader`
[INFO] [stdout]  --> src/stream_processing_9.rs:1:15
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::io::{BufReader, BufRead};
[INFO] [stdout]   |               ^^^^^^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fs::File`
[INFO] [stdout]  --> src/stream_processing_9.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::fs::File;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::hash::Hash`
[INFO] [stdout]  --> src/digital_plumber_12.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::hash::Hash;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]   --> src/spiral_memory_3.rs:87:28
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let quadrant = mod_pos((p - zero), layer_len) / (2 * layer);
[INFO] [stdout]    |                            ^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `HashSet`
[INFO] [stdout]  --> src/memory_realloc_6.rs:3:24
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::{HashSet, HashMap};
[INFO] [stdout]   |                        ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::hash::Hash`
[INFO] [stdout]  --> src/digital_plumber_12.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::hash::Hash;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/memory_realloc_6.rs:23:13
[INFO] [stdout]    |
[INFO] [stdout] 23 |         for i in 0..blocks {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[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/memory_realloc_6.rs:12:23
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let (mut mid, mut mval) = banks.iter_mut()
[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]  --> src/stream_processing_9.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let mut letters = stream.chars().collect::<Vec<char>>();
[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]   --> src/digital_plumber_12.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |         let mut split_line: Vec<&str> = line.split(" <-> ").collect();
[INFO] [stdout]    |             ----^^^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `inverse_captcha`
[INFO] [stdout]  --> src/inverse_captcha_1.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn inverse_captcha(input: Vec<u32>) -> u32 {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `inverse_captcha2`
[INFO] [stdout]   --> src/inverse_captcha_1.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn inverse_captcha2(input: Vec<u32>) -> u32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_valid`
[INFO] [stdout]  --> src/high_entropy_passphrase_4.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn is_valid(passphrase: String) -> bool {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_valid_advanced`
[INFO] [stdout]   --> src/high_entropy_passphrase_4.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn is_valid_advanced(passphrase: String) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `spiral_idx_to_xy`
[INFO] [stdout]   --> src/spiral_memory_3.rs:50:4
[INFO] [stdout]    |
[INFO] [stdout] 50 | fn spiral_idx_to_xy(idx: usize) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `I`
[INFO] [stdout]   --> src/spiral_memory_3.rs:66:1
[INFO] [stdout]    |
[INFO] [stdout] 66 | type I = i32;
[INFO] [stdout]    | ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `U`
[INFO] [stdout]   --> src/spiral_memory_3.rs:67:1
[INFO] [stdout]    |
[INFO] [stdout] 67 | type U = usize;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `layer_index`
[INFO] [stdout]   --> src/spiral_memory_3.rs:69:4
[INFO] [stdout]    |
[INFO] [stdout] 69 | fn layer_index(p: I) -> (I, I, I, I) {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `mod_pos`
[INFO] [stdout]   --> src/spiral_memory_3.rs:96:8
[INFO] [stdout]    |
[INFO] [stdout] 96 | pub fn mod_pos(a: I, b: I) -> I {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `manhattan`
[INFO] [stdout]    --> src/spiral_memory_3.rs:100:4
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn manhattan(p: I) -> I {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `part2`
[INFO] [stdout]    --> src/spiral_memory_3.rs:105:4
[INFO] [stdout]     |
[INFO] [stdout] 105 | fn part2(target: I) -> I {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `solve_part_1`
[INFO] [stdout]  --> src/maze_5.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn solve_part_1(mut list: Vec<i32>) -> usize {
[INFO] [stdout]   |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `solve_part_2`
[INFO] [stdout]   --> src/maze_5.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn solve_part_2(mut list: Vec<i32>) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_input`
[INFO] [stdout]   --> src/maze_5.rs:39:4
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn read_input() -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `solve_p1`
[INFO] [stdout]  --> src/memory_realloc_6.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn solve_p1(mut banks: Vec<usize>) -> (usize, usize) {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `part1`
[INFO] [stdout]  --> src/registers_8.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn part1(lines: Lines<BufReader<File>>) -> (i32, i32) {
[INFO] [stdout]   |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `solve_part1`
[INFO] [stdout]  --> src/stream_processing_9.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn solve_part1(stream: String) -> u32 {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `bfs`
[INFO] [stdout]  --> src/digital_plumber_12.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn bfs(adjacency_map: &HashMap<u16, HashSet<u16>>, visited_nodes: &mut HashSet<u16>, start_node: u16) -> u16 {
[INFO] [stdout]   |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `bfs_alt`
[INFO] [stdout]   --> src/digital_plumber_12.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn bfs_alt(adjacency_map: HashMap<u16, HashSet<u16>>) -> u16 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `part1`
[INFO] [stdout]   --> src/digital_plumber_12.rs:59:4
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn part1(adjacency_map: HashMap<u16, HashSet<u16>>) -> u16 {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `part2`
[INFO] [stdout]   --> src/digital_plumber_12.rs:65:4
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn part2(adjacency_map: HashMap<u16, HashSet<u16>>) -> u16 {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_input`
[INFO] [stdout]   --> src/digital_plumber_12.rs:71:4
[INFO] [stdout]    |
[INFO] [stdout] 71 | fn read_input(path: &str) -> HashMap<u16, HashSet<u16>>{
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 34 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/memory_realloc_6.rs:23:13
[INFO] [stdout]    |
[INFO] [stdout] 23 |         for i in 0..blocks {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `banks`
[INFO] [stdout]   --> src/memory_realloc_6.rs:41:13
[INFO] [stdout]    |
[INFO] [stdout] 41 |         let banks = vec![0, 2, 7, 0];
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_banks`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/high_entropy_passphrase_4.rs:63:17
[INFO] [stdout]    |
[INFO] [stdout] 63 |             let mut l = line.unwrap();
[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]    --> src/high_entropy_passphrase_4.rs:112:17
[INFO] [stdout]     |
[INFO] [stdout] 112 |             let mut l = line.unwrap();
[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]   --> src/memory_realloc_6.rs:12:23
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let (mut mid, mut mval) = banks.iter_mut()
[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]   --> src/memory_realloc_6.rs:48:13
[INFO] [stdout]    |
[INFO] [stdout] 48 |         let mut buffered = BufReader::new(file);
[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]  --> src/stream_processing_9.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let mut letters = stream.chars().collect::<Vec<char>>();
[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]   --> src/digital_plumber_12.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |         let mut split_line: Vec<&str> = line.split(" <-> ").collect();
[INFO] [stdout]    |             ----^^^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `manhattan`
[INFO] [stdout]    --> src/spiral_memory_3.rs:100:4
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn manhattan(p: I) -> I {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.70s
[INFO] running `Command { std: "docker" "inspect" "68db050086ec69ec5dc06a2f07643daed2a7837d820253537fda9e960ea21aa5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "68db050086ec69ec5dc06a2f07643daed2a7837d820253537fda9e960ea21aa5", kill_on_drop: false }`
[INFO] [stdout] 68db050086ec69ec5dc06a2f07643daed2a7837d820253537fda9e960ea21aa5