[INFO] cloning repository https://github.com/mtrefilek/advent-of-code-2021-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mtrefilek/advent-of-code-2021-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmtrefilek%2Fadvent-of-code-2021-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmtrefilek%2Fadvent-of-code-2021-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b8219da128ec0198e0194280f9378899feb3e0f5
[INFO] checking mtrefilek/advent-of-code-2021-rust against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmtrefilek%2Fadvent-of-code-2021-rust" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/mtrefilek/advent-of-code-2021-rust
[INFO] finished tweaking git repo https://github.com/mtrefilek/advent-of-code-2021-rust
[INFO] tweaked toml for git repo https://github.com/mtrefilek/advent-of-code-2021-rust written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/mtrefilek/advent-of-code-2021-rust on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/mtrefilek/advent-of-code-2021-rust 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 72123e51f60e954c4df09ea7899289903ee070e4a6739c1034132c94728a63e4
[INFO] running `Command { std: "docker" "start" "-a" "72123e51f60e954c4df09ea7899289903ee070e4a6739c1034132c94728a63e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "72123e51f60e954c4df09ea7899289903ee070e4a6739c1034132c94728a63e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "72123e51f60e954c4df09ea7899289903ee070e4a6739c1034132c94728a63e4", kill_on_drop: false }`
[INFO] [stdout] 72123e51f60e954c4df09ea7899289903ee070e4a6739c1034132c94728a63e4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 01f2e65e7e3b5c3d12ce712f0a7881407ded0943cff2d440aa69c053783af469
[INFO] running `Command { std: "docker" "start" "-a" "01f2e65e7e3b5c3d12ce712f0a7881407ded0943cff2d440aa69c053783af469", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]    Compiling futures-core v0.3.18
[INFO] [stderr]    Compiling pkg-config v0.3.22
[INFO] [stderr]    Compiling cc v1.0.72
[INFO] [stderr]    Compiling parking_lot_core v0.8.5
[INFO] [stderr]     Checking instant v0.1.12
[INFO] [stderr]    Compiling futures-channel v0.3.18
[INFO] [stderr]     Checking smallvec v1.7.0
[INFO] [stderr]     Checking futures-sink v0.3.18
[INFO] [stderr]    Compiling futures-task v0.3.18
[INFO] [stderr]     Checking lock_api v0.4.5
[INFO] [stderr]    Compiling tokio v1.14.0
[INFO] [stderr]    Compiling futures-util v0.3.18
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]     Checking slab v0.4.5
[INFO] [stderr]     Checking futures-io v0.3.18
[INFO] [stderr]     Checking tinyvec v1.5.1
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]    Compiling const_fn v0.4.8
[INFO] [stderr]    Compiling ryu v1.0.6
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking parking_lot v0.11.2
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking mio v0.7.14
[INFO] [stderr]     Checking signal-hook-registry v1.4.0
[INFO] [stderr]     Checking tracing-core v0.1.21
[INFO] [stderr]     Checking http v0.2.5
[INFO] [stderr]    Compiling time v0.2.27
[INFO] [stderr]    Compiling native-tls v0.2.8
[INFO] [stderr]    Compiling openssl-sys v0.9.71
[INFO] [stderr]     Checking unicode-bidi v0.3.7
[INFO] [stderr]     Checking tracing v0.1.29
[INFO] [stderr]     Checking unicode-normalization v0.1.19
[INFO] [stderr]    Compiling openssl v0.10.38
[INFO] [stderr]    Compiling cookie v0.15.1
[INFO] [stderr]    Compiling serde_json v1.0.72
[INFO] [stderr]     Checking openssl-probe v0.1.4
[INFO] [stderr]     Checking socket2 v0.4.2
[INFO] [stderr]    Compiling encoding_rs v0.8.29
[INFO] [stderr]     Checking psl-types v2.0.9
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking ipnet v2.3.1
[INFO] [stderr]     Checking idna v0.2.3
[INFO] [stderr]     Checking http-body v0.4.4
[INFO] [stderr]     Checking url v2.2.2
[INFO] [stderr]     Checking publicsuffix v2.1.1
[INFO] [stderr]    Compiling futures-macro v0.3.18
[INFO] [stderr]    Compiling tokio-macros v1.6.0
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]    Compiling time-macros-impl v0.1.2
[INFO] [stderr]     Checking time-macros v0.1.1
[INFO] [stderr]     Checking serde v1.0.130
[INFO] [stderr]     Checking futures-executor v0.3.18
[INFO] [stderr]     Checking futures v0.3.18
[INFO] [stderr]     Checking tokio-util v0.6.9
[INFO] [stderr]     Checking tokio-native-tls v0.3.0
[INFO] [stderr]     Checking h2 v0.3.7
[INFO] [stderr]     Checking serde_urlencoded v0.7.0
[INFO] [stderr]     Checking cookie_store v0.15.1
[INFO] [stderr]     Checking hyper v0.14.15
[INFO] [stderr]     Checking hyper-tls v0.5.0
[INFO] [stderr]     Checking reqwest v0.11.7
[INFO] [stderr]     Checking aoc2021 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around closure body
[INFO] [stdout]    --> src/main.rs:623:27
[INFO] [stdout]     |
[INFO] [stdout] 623 |     v.into_iter().map(|y| ((y-x).abs() * ((y-x).abs() + 1) / 2)).sum()
[INFO] [stdout]     |                           ^                                   ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 623 -     v.into_iter().map(|y| ((y-x).abs() * ((y-x).abs() + 1) / 2)).sum()
[INFO] [stdout] 623 +     v.into_iter().map(|y| (y-x).abs() * ((y-x).abs() + 1) / 2 ).sum()
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around closure body
[INFO] [stdout]    --> src/main.rs:623:27
[INFO] [stdout]     |
[INFO] [stdout] 623 |     v.into_iter().map(|y| ((y-x).abs() * ((y-x).abs() + 1) / 2)).sum()
[INFO] [stdout]     |                           ^                                   ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 623 -     v.into_iter().map(|y| ((y-x).abs() * ((y-x).abs() + 1) / 2)).sum()
[INFO] [stdout] 623 +     v.into_iter().map(|y| (y-x).abs() * ((y-x).abs() + 1) / 2 ).sum()
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `max_grad` is never read
[INFO] [stdout]    --> src/main.rs:334:25
[INFO] [stdout]     |
[INFO] [stdout] 334 |                         max_grad = height - h;
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:513:13
[INFO] [stdout]     |
[INFO] [stdout] 513 |         let mut found:char = 'z';
[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: `i`
[INFO] [stdout]    --> src/main.rs:459:22
[INFO] [stdout]     |
[INFO] [stdout] 459 |                 Some(i) => {},
[INFO] [stdout]     |                      ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:467:26
[INFO] [stdout]     |
[INFO] [stdout] 467 |                     Some(i) => {},
[INFO] [stdout]     |                          ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:493:22
[INFO] [stdout]     |
[INFO] [stdout] 493 |                 Some(i) => {
[INFO] [stdout]     |                      ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:500:34
[INFO] [stdout]     |
[INFO] [stdout] 500 | ...                   Some(i) => {},
[INFO] [stdout]     |                            ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `found`
[INFO] [stdout]    --> src/main.rs:513:13
[INFO] [stdout]     |
[INFO] [stdout] 513 |         let mut found:char = 'z';
[INFO] [stdout]     |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_found`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:516:18
[INFO] [stdout]     |
[INFO] [stdout] 516 |             for (i, char2) in &key {
[INFO] [stdout]     |                  ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:528:18
[INFO] [stdout]     |
[INFO] [stdout] 528 |             for (i, char2) in &key {
[INFO] [stdout]     |                  ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `l`
[INFO] [stdout]    --> src/main.rs:587:13
[INFO] [stdout]     |
[INFO] [stdout] 587 |         let l:Vec<&str> = v[0].split(" ").collect();
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_l`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:632:9
[INFO] [stdout]     |
[INFO] [stdout] 632 |     let mut until = if b.len() % 2 == 0 { 2 } else { 1 };
[INFO] [stdout]     |         ----^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:656:9
[INFO] [stdout]     |
[INFO] [stdout] 656 |     for i in 0 .. 7 {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:659:9
[INFO] [stdout]     |
[INFO] [stdout] 659 |     for i in 0 .. 9 {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `err`
[INFO] [stdout]    --> src/main.rs:675:17
[INFO] [stdout]     |
[INFO] [stdout] 675 |             Err(err) => {println!("Error: {}", s); vec[3] += 1;}
[INFO] [stdout]     |                 ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:682:13
[INFO] [stdout]     |
[INFO] [stdout] 682 |         let x = vec[mod_i];
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:703:9
[INFO] [stdout]     |
[INFO] [stdout] 703 |     for i in 0 .. 7 {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:706:9
[INFO] [stdout]     |
[INFO] [stdout] 706 |     for i in 0 .. 9 {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `err`
[INFO] [stdout]    --> src/main.rs:722:17
[INFO] [stdout]     |
[INFO] [stdout] 722 |             Err(err) => {println!("Error: {}", s); vec[3] += 1;}
[INFO] [stdout]     |                 ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:728:13
[INFO] [stdout]     |
[INFO] [stdout] 728 |         let x = vec[mod_i];
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:745:9
[INFO] [stdout]     |
[INFO] [stdout] 745 |     let mut lines = resp.lines();
[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/main.rs:806:9
[INFO] [stdout]     |
[INFO] [stdout] 806 |     let mut lines = resp.lines();
[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/main.rs:859:17
[INFO] [stdout]     |
[INFO] [stdout] 859 |             let mut board: Vec<Vec<(i32, bool)>> = Vec::new();
[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/main.rs:867:21
[INFO] [stdout]     |
[INFO] [stdout] 867 |                 let mut tup = (num, false);
[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/main.rs:882:13
[INFO] [stdout]     |
[INFO] [stdout] 882 |         for mut board in boards.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/main.rs:893:17
[INFO] [stdout]     |
[INFO] [stdout] 893 |             for mut row in board.iter_mut() {
[INFO] [stdout]     |                 ----^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `last_num` is assigned to, but never used
[INFO] [stdout]    --> src/main.rs:876:9
[INFO] [stdout]     |
[INFO] [stdout] 876 |     let mut last_num = 0;
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_last_num` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `index2` is assigned to, but never used
[INFO] [stdout]    --> src/main.rs:894:21
[INFO] [stdout]     |
[INFO] [stdout] 894 |                 let mut index2 = 0;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_index2` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `last_num` is never read
[INFO] [stdout]    --> src/main.rs:942:17
[INFO] [stdout]     |
[INFO] [stdout] 942 |                 last_num = num_i;
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `index2` is never read
[INFO] [stdout]    --> src/main.rs:899:21
[INFO] [stdout]     |
[INFO] [stdout] 899 |                     index2 += 1;
[INFO] [stdout]     |                     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `solved` is never read
[INFO] [stdout]    --> src/main.rs:943:17
[INFO] [stdout]     |
[INFO] [stdout] 943 |                 solved = false;
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:972:17
[INFO] [stdout]     |
[INFO] [stdout] 972 |             let mut board: Vec<Vec<(i32, bool)>> = Vec::new();
[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/main.rs:980:21
[INFO] [stdout]     |
[INFO] [stdout] 980 |                 let mut tup = (num, false);
[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/main.rs:995:13
[INFO] [stdout]     |
[INFO] [stdout] 995 |         for mut board in boards.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/main.rs:1006:17
[INFO] [stdout]      |
[INFO] [stdout] 1006 |             for mut row in board.iter_mut() {
[INFO] [stdout]      |                 ----^^^
[INFO] [stdout]      |                 |
[INFO] [stdout]      |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `last_num` is assigned to, but never used
[INFO] [stdout]    --> src/main.rs:989:9
[INFO] [stdout]     |
[INFO] [stdout] 989 |     let mut last_num = 0;
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_last_num` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `index2` is assigned to, but never used
[INFO] [stdout]     --> src/main.rs:1007:21
[INFO] [stdout]      |
[INFO] [stdout] 1007 |                 let mut index2 = 0;
[INFO] [stdout]      |                     ^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: consider using `_index2` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `last_num` is never read
[INFO] [stdout]     --> src/main.rs:1055:17
[INFO] [stdout]      |
[INFO] [stdout] 1055 |                 last_num = num_i;
[INFO] [stdout]      |                 ^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `index2` is never read
[INFO] [stdout]     --> src/main.rs:1012:21
[INFO] [stdout]      |
[INFO] [stdout] 1012 |                     index2 += 1;
[INFO] [stdout]      |                     ^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `solved` is never read
[INFO] [stdout]     --> src/main.rs:1056:17
[INFO] [stdout]      |
[INFO] [stdout] 1056 |                 solved = false;
[INFO] [stdout]      |                 ^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:79:29
[INFO] [stdout]    |
[INFO] [stdout] 79 |         assert_eq!(five_two(str.parse().unwrap()), 12)
[INFO] [stdout]    |                             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:85:28
[INFO] [stdout]    |
[INFO] [stdout] 85 |         assert_eq!(six_one(str.parse().unwrap()), 5934)
[INFO] [stdout]    |                            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:91:28
[INFO] [stdout]    |
[INFO] [stdout] 91 |         assert_eq!(six_two(str.parse().unwrap()), 26984457539)
[INFO] [stdout]    |                            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:97:30
[INFO] [stdout]    |
[INFO] [stdout] 97 |         assert_eq!(seven_one(str.parse().unwrap()), 37);
[INFO] [stdout]    |                              ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]    --> src/main.rs:103:30
[INFO] [stdout]     |
[INFO] [stdout] 103 |         assert_eq!(seven_two(str.parse().unwrap()), 168);
[INFO] [stdout]     |                              ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `aoc2021` (bin "aoc2021" test) due to 5 previous errors; 40 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: value assigned to `max_grad` is never read
[INFO] [stdout]    --> src/main.rs:334:25
[INFO] [stdout]     |
[INFO] [stdout] 334 |                         max_grad = height - h;
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:513:13
[INFO] [stdout]     |
[INFO] [stdout] 513 |         let mut found:char = 'z';
[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: `i`
[INFO] [stdout]    --> src/main.rs:459:22
[INFO] [stdout]     |
[INFO] [stdout] 459 |                 Some(i) => {},
[INFO] [stdout]     |                      ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:467:26
[INFO] [stdout]     |
[INFO] [stdout] 467 |                     Some(i) => {},
[INFO] [stdout]     |                          ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:493:22
[INFO] [stdout]     |
[INFO] [stdout] 493 |                 Some(i) => {
[INFO] [stdout]     |                      ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:500:34
[INFO] [stdout]     |
[INFO] [stdout] 500 | ...                   Some(i) => {},
[INFO] [stdout]     |                            ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `found`
[INFO] [stdout]    --> src/main.rs:513:13
[INFO] [stdout]     |
[INFO] [stdout] 513 |         let mut found:char = 'z';
[INFO] [stdout]     |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_found`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:516:18
[INFO] [stdout]     |
[INFO] [stdout] 516 |             for (i, char2) in &key {
[INFO] [stdout]     |                  ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:528:18
[INFO] [stdout]     |
[INFO] [stdout] 528 |             for (i, char2) in &key {
[INFO] [stdout]     |                  ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `l`
[INFO] [stdout]    --> src/main.rs:587:13
[INFO] [stdout]     |
[INFO] [stdout] 587 |         let l:Vec<&str> = v[0].split(" ").collect();
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_l`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:632:9
[INFO] [stdout]     |
[INFO] [stdout] 632 |     let mut until = if b.len() % 2 == 0 { 2 } else { 1 };
[INFO] [stdout]     |         ----^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:656:9
[INFO] [stdout]     |
[INFO] [stdout] 656 |     for i in 0 .. 7 {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:659:9
[INFO] [stdout]     |
[INFO] [stdout] 659 |     for i in 0 .. 9 {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `err`
[INFO] [stdout]    --> src/main.rs:675:17
[INFO] [stdout]     |
[INFO] [stdout] 675 |             Err(err) => {println!("Error: {}", s); vec[3] += 1;}
[INFO] [stdout]     |                 ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:682:13
[INFO] [stdout]     |
[INFO] [stdout] 682 |         let x = vec[mod_i];
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:703:9
[INFO] [stdout]     |
[INFO] [stdout] 703 |     for i in 0 .. 7 {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:706:9
[INFO] [stdout]     |
[INFO] [stdout] 706 |     for i in 0 .. 9 {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `err`
[INFO] [stdout]    --> src/main.rs:722:17
[INFO] [stdout]     |
[INFO] [stdout] 722 |             Err(err) => {println!("Error: {}", s); vec[3] += 1;}
[INFO] [stdout]     |                 ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:728:13
[INFO] [stdout]     |
[INFO] [stdout] 728 |         let x = vec[mod_i];
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:745:9
[INFO] [stdout]     |
[INFO] [stdout] 745 |     let mut lines = resp.lines();
[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/main.rs:806:9
[INFO] [stdout]     |
[INFO] [stdout] 806 |     let mut lines = resp.lines();
[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/main.rs:859:17
[INFO] [stdout]     |
[INFO] [stdout] 859 |             let mut board: Vec<Vec<(i32, bool)>> = Vec::new();
[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/main.rs:867:21
[INFO] [stdout]     |
[INFO] [stdout] 867 |                 let mut tup = (num, false);
[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/main.rs:882:13
[INFO] [stdout]     |
[INFO] [stdout] 882 |         for mut board in boards.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/main.rs:893:17
[INFO] [stdout]     |
[INFO] [stdout] 893 |             for mut row in board.iter_mut() {
[INFO] [stdout]     |                 ----^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `last_num` is assigned to, but never used
[INFO] [stdout]    --> src/main.rs:876:9
[INFO] [stdout]     |
[INFO] [stdout] 876 |     let mut last_num = 0;
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_last_num` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `index2` is assigned to, but never used
[INFO] [stdout]    --> src/main.rs:894:21
[INFO] [stdout]     |
[INFO] [stdout] 894 |                 let mut index2 = 0;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_index2` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `last_num` is never read
[INFO] [stdout]    --> src/main.rs:942:17
[INFO] [stdout]     |
[INFO] [stdout] 942 |                 last_num = num_i;
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `index2` is never read
[INFO] [stdout]    --> src/main.rs:899:21
[INFO] [stdout]     |
[INFO] [stdout] 899 |                     index2 += 1;
[INFO] [stdout]     |                     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `solved` is never read
[INFO] [stdout]    --> src/main.rs:943:17
[INFO] [stdout]     |
[INFO] [stdout] 943 |                 solved = false;
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:972:17
[INFO] [stdout]     |
[INFO] [stdout] 972 |             let mut board: Vec<Vec<(i32, bool)>> = Vec::new();
[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/main.rs:980:21
[INFO] [stdout]     |
[INFO] [stdout] 980 |                 let mut tup = (num, false);
[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/main.rs:995:13
[INFO] [stdout]     |
[INFO] [stdout] 995 |         for mut board in boards.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/main.rs:1006:17
[INFO] [stdout]      |
[INFO] [stdout] 1006 |             for mut row in board.iter_mut() {
[INFO] [stdout]      |                 ----^^^
[INFO] [stdout]      |                 |
[INFO] [stdout]      |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `last_num` is assigned to, but never used
[INFO] [stdout]    --> src/main.rs:989:9
[INFO] [stdout]     |
[INFO] [stdout] 989 |     let mut last_num = 0;
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_last_num` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `index2` is assigned to, but never used
[INFO] [stdout]     --> src/main.rs:1007:21
[INFO] [stdout]      |
[INFO] [stdout] 1007 |                 let mut index2 = 0;
[INFO] [stdout]      |                     ^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: consider using `_index2` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `last_num` is never read
[INFO] [stdout]     --> src/main.rs:1055:17
[INFO] [stdout]      |
[INFO] [stdout] 1055 |                 last_num = num_i;
[INFO] [stdout]      |                 ^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `index2` is never read
[INFO] [stdout]     --> src/main.rs:1012:21
[INFO] [stdout]      |
[INFO] [stdout] 1012 |                     index2 += 1;
[INFO] [stdout]      |                     ^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `solved` is never read
[INFO] [stdout]     --> src/main.rs:1056:17
[INFO] [stdout]      |
[INFO] [stdout] 1056 |                 solved = false;
[INFO] [stdout]      |                 ^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "01f2e65e7e3b5c3d12ce712f0a7881407ded0943cff2d440aa69c053783af469", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "01f2e65e7e3b5c3d12ce712f0a7881407ded0943cff2d440aa69c053783af469", kill_on_drop: false }`
[INFO] [stdout] 01f2e65e7e3b5c3d12ce712f0a7881407ded0943cff2d440aa69c053783af469
