[INFO] cloning repository https://github.com/guilgaly/advent-of-code-2021
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/guilgaly/advent-of-code-2021" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguilgaly%2Fadvent-of-code-2021", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguilgaly%2Fadvent-of-code-2021'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9b4b1613a16bbf730d840fd70dbbad0743378ec9
[INFO] checking guilgaly/advent-of-code-2021 against master#af4a5a13a15fa0c60e06321077ef452f769b42fd for pr-122960-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguilgaly%2Fadvent-of-code-2021" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/guilgaly/advent-of-code-2021 on toolchain af4a5a13a15fa0c60e06321077ef452f769b42fd
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/guilgaly/advent-of-code-2021
[INFO] finished tweaking git repo https://github.com/guilgaly/advent-of-code-2021
[INFO] tweaked toml for git repo https://github.com/guilgaly/advent-of-code-2021 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/guilgaly/advent-of-code-2021 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" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ce3343fe1700ab2e88ec928c2a1f1d5edbb3baafbb5c60e8828b9355fd5ce97e
[INFO] running `Command { std: "docker" "start" "-a" "ce3343fe1700ab2e88ec928c2a1f1d5edbb3baafbb5c60e8828b9355fd5ce97e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ce3343fe1700ab2e88ec928c2a1f1d5edbb3baafbb5c60e8828b9355fd5ce97e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce3343fe1700ab2e88ec928c2a1f1d5edbb3baafbb5c60e8828b9355fd5ce97e", kill_on_drop: false }`
[INFO] [stdout] ce3343fe1700ab2e88ec928c2a1f1d5edbb3baafbb5c60e8828b9355fd5ce97e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c6dfd5fd80cda11f1051df870506bf88e4e3f674b199f5a72dcded6f8ffe1a13
[INFO] running `Command { std: "docker" "start" "-a" "c6dfd5fd80cda11f1051df870506bf88e4e3f674b199f5a72dcded6f8ffe1a13", kill_on_drop: false }`
[INFO] [stderr]    Compiling radium v0.6.2
[INFO] [stderr]     Checking tap v1.0.1
[INFO] [stderr]     Checking funty v1.2.0
[INFO] [stderr]     Checking itertools v0.10.1
[INFO] [stderr]     Checking wyz v0.4.0
[INFO] [stderr]     Checking bitvec v0.22.3
[INFO] [stderr]     Checking common v0.1.0 (/opt/rustwide/workdir/common)
[INFO] [stderr]     Checking day_4 v0.1.0 (/opt/rustwide/workdir/day_4)
[INFO] [stderr]     Checking day_2 v0.1.0 (/opt/rustwide/workdir/day_2)
[INFO] [stderr]     Checking day_6 v0.1.0 (/opt/rustwide/workdir/day_6)
[INFO] [stderr]     Checking day_9 v0.1.0 (/opt/rustwide/workdir/day_9)
[INFO] [stderr]     Checking day_13 v0.1.0 (/opt/rustwide/workdir/day_13)
[INFO] [stderr]     Checking day_1 v0.1.0 (/opt/rustwide/workdir/day_1)
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]    --> day_4/src/main.rs:158:9
[INFO] [stdout]     |
[INFO] [stdout] 158 |     use super::*;
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking day_12 v0.1.0 (/opt/rustwide/workdir/day_12)
[INFO] [stdout] warning: struct `Coord` is never constructed
[INFO] [stdout]   --> day_9/src/main.rs:73:8
[INFO] [stdout]    |
[INFO] [stdout] 73 | struct Coord {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `is_neighbor` is never used
[INFO] [stdout]   --> day_9/src/main.rs:79:8
[INFO] [stdout]    |
[INFO] [stdout] 78 | impl Coord {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] 79 |     fn is_neighbor(&self, other: &Coord) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]   --> day_9/src/main.rs:37:31
[INFO] [stdout]    |
[INFO] [stdout] 37 |             for risk_level in heights_map.low_point_risk_level(x, y) {
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(for_loops_over_fallibles)]` on by default
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]    |
[INFO] [stdout] 37 |             while let Some(risk_level) = heights_map.low_point_risk_level(x, y) {
[INFO] [stdout]    |             ~~~~~~~~~~~~~~~          ~~~
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    |
[INFO] [stdout] 37 |             if let Some(risk_level) = heights_map.low_point_risk_level(x, y) {
[INFO] [stdout]    |             ~~~~~~~~~~~~          ~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking day_10 v0.1.0 (/opt/rustwide/workdir/day_10)
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking day_11 v0.1.0 (/opt/rustwide/workdir/day_11)
[INFO] [stdout] warning: unused imports: `BinaryHeap`, `VecDeque`
[INFO] [stdout]  --> day_10/src/main.rs:5:24
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::collections::{BinaryHeap, VecDeque};
[INFO] [stdout]   |                        ^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::format`
[INFO] [stdout]  --> day_10/src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::fmt::format;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> day_13/src/main.rs:41:17
[INFO] [stdout]    |
[INFO] [stdout] 41 |                 write!(target_string, "#");
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> day_13/src/main.rs:43:17
[INFO] [stdout]    |
[INFO] [stdout] 43 |                 write!(target_string, " ");
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> day_13/src/main.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |         writeln!(target_string, "");
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `BinaryHeap`, `VecDeque`
[INFO] [stdout]  --> day_10/src/main.rs:5:24
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::collections::{BinaryHeap, VecDeque};
[INFO] [stdout]   |                        ^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::format`
[INFO] [stdout]  --> day_10/src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::fmt::format;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking day_7 v0.1.0 (/opt/rustwide/workdir/day_7)
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking day_8 v0.1.0 (/opt/rustwide/workdir/day_8)
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected `;`, found `}`
[INFO] [stdout]   --> day_8/src/main.rs:52:19
[INFO] [stdout]    |
[INFO] [stdout] 52 |         let digits
[INFO] [stdout]    |                   ^ help: add `;` here
[INFO] [stdout] 53 |
[INFO] [stdout] 54 |     }
[INFO] [stdout]    |     - unexpected token
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Segment`
[INFO] [stdout]  --> day_8/src/main.rs:1:22
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::signals::{Segment, SignalPattern};
[INFO] [stdout]   |                      ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `common::lazy_static::lazy_static`
[INFO] [stdout]  --> day_8/src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use common::lazy_static::lazy_static;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `common::regex::Regex`
[INFO] [stdout]  --> day_8/src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use common::regex::Regex;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashSet`
[INFO] [stdout]  --> day_8/src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::collections::HashSet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> day_8/src/main.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |         let digits
[INFO] [stdout]    |             ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: consider giving `digits` an explicit type
[INFO] [stdout]    |
[INFO] [stdout] 52 |         let digits: /* Type */
[INFO] [stdout]    |                   ++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> day_13/src/main.rs:41:17
[INFO] [stdout]    |
[INFO] [stdout] 41 |                 write!(target_string, "#");
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> day_13/src/main.rs:43:17
[INFO] [stdout]    |
[INFO] [stdout] 43 |                 write!(target_string, " ");
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> day_13/src/main.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |         writeln!(target_string, "");
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected `;`, found `}`
[INFO] [stdout]   --> day_8/src/main.rs:52:19
[INFO] [stdout]    |
[INFO] [stdout] 52 |         let digits
[INFO] [stdout]    |                   ^ help: add `;` here
[INFO] [stdout] 53 |
[INFO] [stdout] 54 |     }
[INFO] [stdout]    |     - unexpected token
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `day_8` (bin "day_8") due to 3 previous errors; 4 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Segment`
[INFO] [stdout]  --> day_8/src/main.rs:1:22
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::signals::{Segment, SignalPattern};
[INFO] [stdout]   |                      ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `common::lazy_static::lazy_static`
[INFO] [stdout]  --> day_8/src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use common::lazy_static::lazy_static;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `common::regex::Regex`
[INFO] [stdout]  --> day_8/src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use common::regex::Regex;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashSet`
[INFO] [stdout]  --> day_8/src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::collections::HashSet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> day_8/src/main.rs:91:9
[INFO] [stdout]    |
[INFO] [stdout] 91 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> day_8/src/main.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |         let digits
[INFO] [stdout]    |             ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: consider giving `digits` an explicit type
[INFO] [stdout]    |
[INFO] [stdout] 52 |         let digits: /* Type */
[INFO] [stdout]    |                   ++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `day_8` (bin "day_8" test) due to 3 previous errors; 5 warnings emitted
[INFO] [stdout] warning: struct `Coord` is never constructed
[INFO] [stdout]   --> day_9/src/main.rs:73:8
[INFO] [stdout]    |
[INFO] [stdout] 73 | struct Coord {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `is_neighbor` is never used
[INFO] [stdout]   --> day_9/src/main.rs:79:8
[INFO] [stdout]    |
[INFO] [stdout] 78 | impl Coord {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] 79 |     fn is_neighbor(&self, other: &Coord) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]   --> day_9/src/main.rs:37:31
[INFO] [stdout]    |
[INFO] [stdout] 37 |             for risk_level in heights_map.low_point_risk_level(x, y) {
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(for_loops_over_fallibles)]` on by default
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]    |
[INFO] [stdout] 37 |             while let Some(risk_level) = heights_map.low_point_risk_level(x, y) {
[INFO] [stdout]    |             ~~~~~~~~~~~~~~~          ~~~
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    |
[INFO] [stdout] 37 |             if let Some(risk_level) = heights_map.low_point_risk_level(x, y) {
[INFO] [stdout]    |             ~~~~~~~~~~~~          ~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "c6dfd5fd80cda11f1051df870506bf88e4e3f674b199f5a72dcded6f8ffe1a13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6dfd5fd80cda11f1051df870506bf88e4e3f674b199f5a72dcded6f8ffe1a13", kill_on_drop: false }`
[INFO] [stdout] c6dfd5fd80cda11f1051df870506bf88e4e3f674b199f5a72dcded6f8ffe1a13