[INFO] cloning repository https://github.com/breezykermo/1-maze-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/breezykermo/1-maze-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbreezykermo%2F1-maze-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbreezykermo%2F1-maze-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a70d09c060e4405721a5e4487ed7a2e3f7d942b4
[INFO] testing breezykermo/1-maze-rs against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbreezykermo%2F1-maze-rs" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/breezykermo/1-maze-rs on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/breezykermo/1-maze-rs
[INFO] finished tweaking git repo https://github.com/breezykermo/1-maze-rs
[INFO] tweaked toml for git repo https://github.com/breezykermo/1-maze-rs written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/breezykermo/1-maze-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 04e1770af5c3fedefc353b95351d524c36f9c8305a5a4d2f08533a45b9694d33
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "04e1770af5c3fedefc353b95351d524c36f9c8305a5a4d2f08533a45b9694d33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "04e1770af5c3fedefc353b95351d524c36f9c8305a5a4d2f08533a45b9694d33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "04e1770af5c3fedefc353b95351d524c36f9c8305a5a4d2f08533a45b9694d33", kill_on_drop: false }`
[INFO] [stdout] 04e1770af5c3fedefc353b95351d524c36f9c8305a5a4d2f08533a45b9694d33
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 410812f312c6341fe14070b6c3edf2eb411c4a57618ba20c45797fb99fde27e0
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "410812f312c6341fe14070b6c3edf2eb411c4a57618ba20c45797fb99fde27e0", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.101
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling rust_1_maze v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/common.rs:56:20
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn is_in_range(row: usize, col: usize, num_rows: usize, num_cols: usize) -> bool {
[INFO] [stdout]    |                    ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `col`
[INFO] [stdout]   --> src/common.rs:56:32
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn is_in_range(row: usize, col: usize, num_rows: usize, num_cols: usize) -> bool {
[INFO] [stdout]    |                                ^^^ help: if this is intentional, prefix it with an underscore: `_col`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_rows`
[INFO] [stdout]   --> src/common.rs:56:44
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn is_in_range(row: usize, col: usize, num_rows: usize, num_cols: usize) -> bool {
[INFO] [stdout]    |                                            ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_cols`
[INFO] [stdout]   --> src/common.rs:56:61
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn is_in_range(row: usize, col: usize, num_rows: usize, num_cols: usize) -> bool {
[INFO] [stdout]    |                                                             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_rows`
[INFO] [stdout]   --> src/common.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 62 |     num_rows: usize,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_cols`
[INFO] [stdout]   --> src/common.rs:63:5
[INFO] [stdout]    |
[INFO] [stdout] 63 |     num_cols: usize,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `room`
[INFO] [stdout]   --> src/common.rs:65:5
[INFO] [stdout]    |
[INFO] [stdout] 65 |     room: &MazeRoom,
[INFO] [stdout]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_room`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dir`
[INFO] [stdout]   --> src/common.rs:66:5
[INFO] [stdout]    |
[INFO] [stdout] 66 |     dir: Direction,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_dir`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_cols`
[INFO] [stdout]   --> src/common.rs:72:28
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn initialize_maze<'a>(num_cols: usize, num_rows: usize, maze: &mut Vec<Vec<MazeRoom>>) -> () {
[INFO] [stdout]    |                            ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_rows`
[INFO] [stdout]   --> src/common.rs:72:45
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn initialize_maze<'a>(num_cols: usize, num_rows: usize, maze: &mut Vec<Vec<MazeRoom>>) -> () {
[INFO] [stdout]    |                                             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `maze`
[INFO] [stdout]   --> src/common.rs:72:62
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn initialize_maze<'a>(num_cols: usize, num_rows: usize, maze: &mut Vec<Vec<MazeRoom>>) -> () {
[INFO] [stdout]    |                                                              ^^^^ help: if this is intentional, prefix it with an underscore: `_maze`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `get_neighbor`
[INFO] [stdout]  --> src/bin/generator.rs:3:27
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rust_1_maze::common::{get_neighbor, Direction, MazeRoom};
[INFO] [stdout]   |                           ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/bin/generator.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     row: usize,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `col`
[INFO] [stdout]   --> src/bin/generator.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     col: usize,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_col`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_rows`
[INFO] [stdout]   --> src/bin/generator.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     num_rows: usize,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_cols`
[INFO] [stdout]   --> src/bin/generator.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     num_cols: usize,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `maze`
[INFO] [stdout]   --> src/bin/generator.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     maze: RefCell<Vec<Vec<MazeRoom>>>, // pass as RefCell so that it can be borrowed both mutably and immutably
[INFO] [stdout]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_maze`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_opposite_dir`
[INFO] [stdout]   --> src/bin/generator.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn get_opposite_dir(dir: Direction) -> Direction {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shuffle_directions`
[INFO] [stdout]   --> src/bin/generator.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn shuffle_directions(directions: &mut Vec<Direction>) -> () {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `drunken_walk`
[INFO] [stdout]   --> src/bin/generator.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn drunken_walk(
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `maze_room`
[INFO] [stdout]   --> src/bin/solver.rs:28:28
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn create_room_connections(maze_room: &MazeRoom, hex: u8) -> () {}
[INFO] [stdout]    |                            ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_maze_room`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hex`
[INFO] [stdout]   --> src/bin/solver.rs:28:50
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn create_room_connections(maze_room: &MazeRoom, hex: u8) -> () {}
[INFO] [stdout]    |                                                  ^^^ help: if this is intentional, prefix it with an underscore: `_hex`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/bin/solver.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     row: u8,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `col`
[INFO] [stdout]   --> src/bin/solver.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     col: u8,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_col`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `goal_row`
[INFO] [stdout]   --> src/bin/solver.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     goal_row: u8,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_goal_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `goal_col`
[INFO] [stdout]   --> src/bin/solver.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     goal_col: u8,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_goal_col`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_rows`
[INFO] [stdout]   --> src/bin/solver.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     num_rows: u8,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_cols`
[INFO] [stdout]   --> src/bin/solver.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 36 |     num_cols: u8,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `maze`
[INFO] [stdout]   --> src/bin/solver.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 |     maze: Vec<Vec<MazeRoom>>,
[INFO] [stdout]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_maze`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `file`
[INFO] [stdout]   --> src/bin/solver.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 38 |     file: &File,
[INFO] [stdout]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_file`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_rows`
[INFO] [stdout]   --> src/bin/solver.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 |     num_rows: u8,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_cols`
[INFO] [stdout]   --> src/bin/solver.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 45 |     num_cols: u8,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `maze`
[INFO] [stdout]   --> src/bin/solver.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 46 |     maze: Vec<Vec<MazeRoom>>,
[INFO] [stdout]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_maze`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `encoded_maze`
[INFO] [stdout]   --> src/bin/solver.rs:47:5
[INFO] [stdout]    |
[INFO] [stdout] 47 |     encoded_maze: Vec<Vec<u8>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_encoded_maze`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `room`
[INFO] [stdout]   --> src/bin/solver.rs:51:22
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn print_pruned_path(room: &MazeRoom, file: &File) -> u8 {
[INFO] [stdout]    |                      ^^^^ help: if this is intentional, prefix it with an underscore: `_room`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `file`
[INFO] [stdout]   --> src/bin/solver.rs:51:39
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn print_pruned_path(room: &MazeRoom, file: &File) -> u8 {
[INFO] [stdout]    |                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_file`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_room_connections`
[INFO] [stdout]   --> src/bin/solver.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn create_room_connections(maze_room: &MazeRoom, hex: u8) -> () {}
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `dfs`
[INFO] [stdout]   --> src/bin/solver.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn dfs(
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `decode_maze`
[INFO] [stdout]   --> src/bin/solver.rs:43:4
[INFO] [stdout]    |
[INFO] [stdout] 43 | fn decode_maze(
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_pruned_path`
[INFO] [stdout]   --> src/bin/solver.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn print_pruned_path(room: &MazeRoom, file: &File) -> u8 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.97s
[INFO] running `Command { std: "docker" "inspect" "410812f312c6341fe14070b6c3edf2eb411c4a57618ba20c45797fb99fde27e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "410812f312c6341fe14070b6c3edf2eb411c4a57618ba20c45797fb99fde27e0", kill_on_drop: false }`
[INFO] [stdout] 410812f312c6341fe14070b6c3edf2eb411c4a57618ba20c45797fb99fde27e0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] b16164e57133b29d60f87515b11a4db3f3e47ba4fcd828b6c102041312e3a60b
[INFO] running `Command { std: "docker" "start" "-a" "b16164e57133b29d60f87515b11a4db3f3e47ba4fcd828b6c102041312e3a60b", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_1_maze v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/common.rs:56:20
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn is_in_range(row: usize, col: usize, num_rows: usize, num_cols: usize) -> bool {
[INFO] [stdout]    |                    ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `col`
[INFO] [stdout]   --> src/common.rs:56:32
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn is_in_range(row: usize, col: usize, num_rows: usize, num_cols: usize) -> bool {
[INFO] [stdout]    |                                ^^^ help: if this is intentional, prefix it with an underscore: `_col`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_rows`
[INFO] [stdout]   --> src/common.rs:56:44
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn is_in_range(row: usize, col: usize, num_rows: usize, num_cols: usize) -> bool {
[INFO] [stdout]    |                                            ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_cols`
[INFO] [stdout]   --> src/common.rs:56:61
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn is_in_range(row: usize, col: usize, num_rows: usize, num_cols: usize) -> bool {
[INFO] [stdout]    |                                                             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_rows`
[INFO] [stdout]   --> src/common.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 62 |     num_rows: usize,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_cols`
[INFO] [stdout]   --> src/common.rs:63:5
[INFO] [stdout]    |
[INFO] [stdout] 63 |     num_cols: usize,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `room`
[INFO] [stdout]   --> src/common.rs:65:5
[INFO] [stdout]    |
[INFO] [stdout] 65 |     room: &MazeRoom,
[INFO] [stdout]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_room`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dir`
[INFO] [stdout]   --> src/common.rs:66:5
[INFO] [stdout]    |
[INFO] [stdout] 66 |     dir: Direction,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_dir`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_cols`
[INFO] [stdout]   --> src/common.rs:72:28
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn initialize_maze<'a>(num_cols: usize, num_rows: usize, maze: &mut Vec<Vec<MazeRoom>>) -> () {
[INFO] [stdout]    |                            ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_rows`
[INFO] [stdout]   --> src/common.rs:72:45
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn initialize_maze<'a>(num_cols: usize, num_rows: usize, maze: &mut Vec<Vec<MazeRoom>>) -> () {
[INFO] [stdout]    |                                             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `maze`
[INFO] [stdout]   --> src/common.rs:72:62
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn initialize_maze<'a>(num_cols: usize, num_rows: usize, maze: &mut Vec<Vec<MazeRoom>>) -> () {
[INFO] [stdout]    |                                                              ^^^^ help: if this is intentional, prefix it with an underscore: `_maze`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `maze_room`
[INFO] [stdout]   --> src/bin/solver.rs:28:28
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn create_room_connections(maze_room: &MazeRoom, hex: u8) -> () {}
[INFO] [stdout]    |                            ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_maze_room`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hex`
[INFO] [stdout]   --> src/bin/solver.rs:28:50
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn create_room_connections(maze_room: &MazeRoom, hex: u8) -> () {}
[INFO] [stdout]    |                                                  ^^^ help: if this is intentional, prefix it with an underscore: `_hex`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/bin/solver.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     row: u8,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `col`
[INFO] [stdout]   --> src/bin/solver.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     col: u8,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_col`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `goal_row`
[INFO] [stdout]   --> src/bin/solver.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     goal_row: u8,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_goal_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `goal_col`
[INFO] [stdout]   --> src/bin/solver.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     goal_col: u8,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_goal_col`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_rows`
[INFO] [stdout]   --> src/bin/solver.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     num_rows: u8,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_cols`
[INFO] [stdout]   --> src/bin/solver.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 36 |     num_cols: u8,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `maze`
[INFO] [stdout]   --> src/bin/solver.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 |     maze: Vec<Vec<MazeRoom>>,
[INFO] [stdout]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_maze`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `file`
[INFO] [stdout]   --> src/bin/solver.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 38 |     file: &File,
[INFO] [stdout]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_file`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_rows`
[INFO] [stdout]   --> src/bin/solver.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 |     num_rows: u8,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_cols`
[INFO] [stdout]   --> src/bin/solver.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 45 |     num_cols: u8,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `maze`
[INFO] [stdout]   --> src/bin/solver.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 46 |     maze: Vec<Vec<MazeRoom>>,
[INFO] [stdout]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_maze`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `encoded_maze`
[INFO] [stdout]   --> src/bin/solver.rs:47:5
[INFO] [stdout]    |
[INFO] [stdout] 47 |     encoded_maze: Vec<Vec<u8>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_encoded_maze`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `room`
[INFO] [stdout]   --> src/bin/solver.rs:51:22
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn print_pruned_path(room: &MazeRoom, file: &File) -> u8 {
[INFO] [stdout]    |                      ^^^^ help: if this is intentional, prefix it with an underscore: `_room`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `file`
[INFO] [stdout]   --> src/bin/solver.rs:51:39
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn print_pruned_path(room: &MazeRoom, file: &File) -> u8 {
[INFO] [stdout]    |                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_file`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_room_connections`
[INFO] [stdout]   --> src/bin/solver.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn create_room_connections(maze_room: &MazeRoom, hex: u8) -> () {}
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `dfs`
[INFO] [stdout]   --> src/bin/solver.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn dfs(
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `decode_maze`
[INFO] [stdout]   --> src/bin/solver.rs:43:4
[INFO] [stdout]    |
[INFO] [stdout] 43 | fn decode_maze(
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_pruned_path`
[INFO] [stdout]   --> src/bin/solver.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn print_pruned_path(room: &MazeRoom, file: &File) -> u8 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `get_neighbor`
[INFO] [stdout]  --> src/bin/generator.rs:3:27
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rust_1_maze::common::{get_neighbor, Direction, MazeRoom};
[INFO] [stdout]   |                           ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/bin/generator.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     row: usize,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `col`
[INFO] [stdout]   --> src/bin/generator.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     col: usize,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_col`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_rows`
[INFO] [stdout]   --> src/bin/generator.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     num_rows: usize,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_cols`
[INFO] [stdout]   --> src/bin/generator.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     num_cols: usize,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `maze`
[INFO] [stdout]   --> src/bin/generator.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     maze: RefCell<Vec<Vec<MazeRoom>>>, // pass as RefCell so that it can be borrowed both mutably and immutably
[INFO] [stdout]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_maze`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_opposite_dir`
[INFO] [stdout]   --> src/bin/generator.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn get_opposite_dir(dir: Direction) -> Direction {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shuffle_directions`
[INFO] [stdout]   --> src/bin/generator.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn shuffle_directions(directions: &mut Vec<Direction>) -> () {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `drunken_walk`
[INFO] [stdout]   --> src/bin/generator.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn drunken_walk(
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `maze_room`
[INFO] [stdout]   --> src/bin/solver.rs:28:28
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn create_room_connections(maze_room: &MazeRoom, hex: u8) -> () {}
[INFO] [stdout]    |                            ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_maze_room`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hex`
[INFO] [stdout]   --> src/bin/solver.rs:28:50
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn create_room_connections(maze_room: &MazeRoom, hex: u8) -> () {}
[INFO] [stdout]    |                                                  ^^^ help: if this is intentional, prefix it with an underscore: `_hex`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/bin/solver.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     row: u8,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `col`
[INFO] [stdout]   --> src/bin/solver.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     col: u8,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_col`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `goal_row`
[INFO] [stdout]   --> src/bin/solver.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     goal_row: u8,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_goal_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `goal_col`
[INFO] [stdout]   --> src/bin/solver.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     goal_col: u8,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_goal_col`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_rows`
[INFO] [stdout]   --> src/bin/solver.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     num_rows: u8,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_cols`
[INFO] [stdout]   --> src/bin/solver.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 36 |     num_cols: u8,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `maze`
[INFO] [stdout]   --> src/bin/solver.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 |     maze: Vec<Vec<MazeRoom>>,
[INFO] [stdout]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_maze`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `file`
[INFO] [stdout]   --> src/bin/solver.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 38 |     file: &File,
[INFO] [stdout]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_file`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_rows`
[INFO] [stdout]   --> src/bin/solver.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 |     num_rows: u8,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_cols`
[INFO] [stdout]   --> src/bin/solver.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 45 |     num_cols: u8,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `maze`
[INFO] [stdout]   --> src/bin/solver.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 46 |     maze: Vec<Vec<MazeRoom>>,
[INFO] [stdout]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_maze`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `encoded_maze`
[INFO] [stdout]   --> src/bin/solver.rs:47:5
[INFO] [stdout]    |
[INFO] [stdout] 47 |     encoded_maze: Vec<Vec<u8>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_encoded_maze`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `room`
[INFO] [stdout]   --> src/bin/solver.rs:51:22
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn print_pruned_path(room: &MazeRoom, file: &File) -> u8 {
[INFO] [stdout]    |                      ^^^^ help: if this is intentional, prefix it with an underscore: `_room`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `file`
[INFO] [stdout]   --> src/bin/solver.rs:51:39
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn print_pruned_path(room: &MazeRoom, file: &File) -> u8 {
[INFO] [stdout]    |                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_file`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_room_connections`
[INFO] [stdout]   --> src/bin/solver.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn create_room_connections(maze_room: &MazeRoom, hex: u8) -> () {}
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `dfs`
[INFO] [stdout]   --> src/bin/solver.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn dfs(
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `decode_maze`
[INFO] [stdout]   --> src/bin/solver.rs:43:4
[INFO] [stdout]    |
[INFO] [stdout] 43 | fn decode_maze(
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_pruned_path`
[INFO] [stdout]   --> src/bin/solver.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn print_pruned_path(room: &MazeRoom, file: &File) -> u8 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `get_neighbor`
[INFO] [stdout]  --> src/bin/generator.rs:3:27
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rust_1_maze::common::{get_neighbor, Direction, MazeRoom};
[INFO] [stdout]   |                           ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/bin/generator.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     row: usize,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `col`
[INFO] [stdout]   --> src/bin/generator.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     col: usize,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_col`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_rows`
[INFO] [stdout]   --> src/bin/generator.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     num_rows: usize,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_cols`
[INFO] [stdout]   --> src/bin/generator.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     num_cols: usize,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `maze`
[INFO] [stdout]   --> src/bin/generator.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     maze: RefCell<Vec<Vec<MazeRoom>>>, // pass as RefCell so that it can be borrowed both mutably and immutably
[INFO] [stdout]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_maze`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_opposite_dir`
[INFO] [stdout]   --> src/bin/generator.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn get_opposite_dir(dir: Direction) -> Direction {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shuffle_directions`
[INFO] [stdout]   --> src/bin/generator.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn shuffle_directions(directions: &mut Vec<Direction>) -> () {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `drunken_walk`
[INFO] [stdout]   --> src/bin/generator.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn drunken_walk(
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> src/lib.rs:76:9
[INFO] [stdout]    |
[INFO] [stdout] 76 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] help: consider adding a `#[cfg(test)]` to the containing module
[INFO] [stdout]   --> src/lib.rs:75:1
[INFO] [stdout]    |
[INFO] [stdout] 75 | mod tests {
[INFO] [stdout]    | ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Direction`, `MazeRoom`, `initialize_maze`
[INFO] [stdout]  --> tests/integration_test.rs:1:27
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rust_1_maze::common::{initialize_maze, Direction, MazeRoom};
[INFO] [stdout]   |                           ^^^^^^^^^^^^^^^  ^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `read_encoded_maze_from_file`, `write_encoded_maze_to_file`
[INFO] [stdout]  --> tests/integration_test.rs:2:19
[INFO] [stdout]   |
[INFO] [stdout] 2 | use rust_1_maze::{read_encoded_maze_from_file, write_encoded_maze_to_file};
[INFO] [stdout]   |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fs`
[INFO] [stdout]  --> tests/integration_test.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::fs;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/common.rs:56:20
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn is_in_range(row: usize, col: usize, num_rows: usize, num_cols: usize) -> bool {
[INFO] [stdout]    |                    ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `col`
[INFO] [stdout]   --> src/common.rs:56:32
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn is_in_range(row: usize, col: usize, num_rows: usize, num_cols: usize) -> bool {
[INFO] [stdout]    |                                ^^^ help: if this is intentional, prefix it with an underscore: `_col`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_rows`
[INFO] [stdout]   --> src/common.rs:56:44
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn is_in_range(row: usize, col: usize, num_rows: usize, num_cols: usize) -> bool {
[INFO] [stdout]    |                                            ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_cols`
[INFO] [stdout]   --> src/common.rs:56:61
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn is_in_range(row: usize, col: usize, num_rows: usize, num_cols: usize) -> bool {
[INFO] [stdout]    |                                                             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_rows`
[INFO] [stdout]   --> src/common.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 62 |     num_rows: usize,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_cols`
[INFO] [stdout]   --> src/common.rs:63:5
[INFO] [stdout]    |
[INFO] [stdout] 63 |     num_cols: usize,
[INFO] [stdout]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `room`
[INFO] [stdout]   --> src/common.rs:65:5
[INFO] [stdout]    |
[INFO] [stdout] 65 |     room: &MazeRoom,
[INFO] [stdout]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_room`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dir`
[INFO] [stdout]   --> src/common.rs:66:5
[INFO] [stdout]    |
[INFO] [stdout] 66 |     dir: Direction,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_dir`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_cols`
[INFO] [stdout]   --> src/common.rs:72:28
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn initialize_maze<'a>(num_cols: usize, num_rows: usize, maze: &mut Vec<Vec<MazeRoom>>) -> () {
[INFO] [stdout]    |                            ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_rows`
[INFO] [stdout]   --> src/common.rs:72:45
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn initialize_maze<'a>(num_cols: usize, num_rows: usize, maze: &mut Vec<Vec<MazeRoom>>) -> () {
[INFO] [stdout]    |                                             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `maze`
[INFO] [stdout]   --> src/common.rs:72:62
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn initialize_maze<'a>(num_cols: usize, num_rows: usize, maze: &mut Vec<Vec<MazeRoom>>) -> () {
[INFO] [stdout]    |                                                              ^^^^ help: if this is intentional, prefix it with an underscore: `_maze`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.54s
[INFO] [stderr]   Executable unittests src/lib.rs (/opt/rustwide/target/debug/deps/rust_1_maze-c145280867b04487)
[INFO] [stderr]   Executable unittests src/bin/generator.rs (/opt/rustwide/target/debug/deps/generator-8496f0228d16e051)
[INFO] [stderr]   Executable unittests src/bin/solver.rs (/opt/rustwide/target/debug/deps/solver-1c1e62b340b8d1f2)
[INFO] [stderr]   Executable tests/integration_test.rs (/opt/rustwide/target/debug/deps/integration_test-1d8ae84e069fea4b)
[INFO] running `Command { std: "docker" "inspect" "b16164e57133b29d60f87515b11a4db3f3e47ba4fcd828b6c102041312e3a60b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b16164e57133b29d60f87515b11a4db3f3e47ba4fcd828b6c102041312e3a60b", kill_on_drop: false }`
[INFO] [stdout] b16164e57133b29d60f87515b11a4db3f3e47ba4fcd828b6c102041312e3a60b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] a6ad01467fd648cab799c225b6b77dfe09b6799d678f3d739e7c2687eca9c08c
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "a6ad01467fd648cab799c225b6b77dfe09b6799d678f3d739e7c2687eca9c08c", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `row`
[INFO] [stderr]   --> src/common.rs:56:20
[INFO] [stderr]    |
[INFO] [stderr] 56 | pub fn is_in_range(row: usize, col: usize, num_rows: usize, num_cols: usize) -> bool {
[INFO] [stderr]    |                    ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `col`
[INFO] [stderr]   --> src/common.rs:56:32
[INFO] [stderr]    |
[INFO] [stderr] 56 | pub fn is_in_range(row: usize, col: usize, num_rows: usize, num_cols: usize) -> bool {
[INFO] [stderr]    |                                ^^^ help: if this is intentional, prefix it with an underscore: `_col`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_rows`
[INFO] [stderr]   --> src/common.rs:56:44
[INFO] [stderr]    |
[INFO] [stderr] 56 | pub fn is_in_range(row: usize, col: usize, num_rows: usize, num_cols: usize) -> bool {
[INFO] [stderr]    |                                            ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_cols`
[INFO] [stderr]   --> src/common.rs:56:61
[INFO] [stderr]    |
[INFO] [stderr] 56 | pub fn is_in_range(row: usize, col: usize, num_rows: usize, num_cols: usize) -> bool {
[INFO] [stderr]    |                                                             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_rows`
[INFO] [stderr]   --> src/common.rs:62:5
[INFO] [stderr]    |
[INFO] [stderr] 62 |     num_rows: usize,
[INFO] [stderr]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_cols`
[INFO] [stderr]   --> src/common.rs:63:5
[INFO] [stderr]    |
[INFO] [stderr] 63 |     num_cols: usize,
[INFO] [stderr]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `room`
[INFO] [stderr]   --> src/common.rs:65:5
[INFO] [stderr]    |
[INFO] [stderr] 65 |     room: &MazeRoom,
[INFO] [stderr]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_room`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `dir`
[INFO] [stderr]   --> src/common.rs:66:5
[INFO] [stderr]    |
[INFO] [stderr] 66 |     dir: Direction,
[INFO] [stderr]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_dir`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_cols`
[INFO] [stderr]   --> src/common.rs:72:28
[INFO] [stderr]    |
[INFO] [stderr] 72 | pub fn initialize_maze<'a>(num_cols: usize, num_rows: usize, maze: &mut Vec<Vec<MazeRoom>>) -> () {
[INFO] [stderr]    |                            ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_rows`
[INFO] [stderr]   --> src/common.rs:72:45
[INFO] [stderr]    |
[INFO] [stderr] 72 | pub fn initialize_maze<'a>(num_cols: usize, num_rows: usize, maze: &mut Vec<Vec<MazeRoom>>) -> () {
[INFO] [stderr]    |                                             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `maze`
[INFO] [stderr]   --> src/common.rs:72:62
[INFO] [stderr]    |
[INFO] [stderr] 72 | pub fn initialize_maze<'a>(num_cols: usize, num_rows: usize, maze: &mut Vec<Vec<MazeRoom>>) -> () {
[INFO] [stderr]    |                                                              ^^^^ help: if this is intentional, prefix it with an underscore: `_maze`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]   --> src/lib.rs:76:9
[INFO] [stderr]    |
[INFO] [stderr] 76 |     use super::*;
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] help: consider adding a `#[cfg(test)]` to the containing module
[INFO] [stderr]   --> src/lib.rs:75:1
[INFO] [stderr]    |
[INFO] [stderr] 75 | mod tests {
[INFO] [stderr]    | ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_1_maze` (lib) generated 11 warnings
[INFO] [stderr] warning: `rust_1_maze` (lib test) generated 12 warnings (11 duplicates)
[INFO] [stderr] warning: unused import: `get_neighbor`
[INFO] [stderr]  --> src/bin/generator.rs:3:27
[INFO] [stderr]   |
[INFO] [stderr] 3 | use rust_1_maze::common::{get_neighbor, Direction, MazeRoom};
[INFO] [stderr]   |                           ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `row`
[INFO] [stderr]   --> src/bin/generator.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     row: usize,
[INFO] [stderr]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `col`
[INFO] [stderr]   --> src/bin/generator.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     col: usize,
[INFO] [stderr]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_col`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_rows`
[INFO] [stderr]   --> src/bin/generator.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 33 |     num_rows: usize,
[INFO] [stderr]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_cols`
[INFO] [stderr]   --> src/bin/generator.rs:34:5
[INFO] [stderr]    |
[INFO] [stderr] 34 |     num_cols: usize,
[INFO] [stderr]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `maze`
[INFO] [stderr]   --> src/bin/generator.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     maze: RefCell<Vec<Vec<MazeRoom>>>, // pass as RefCell so that it can be borrowed both mutably and immutably
[INFO] [stderr]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_maze`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_opposite_dir`
[INFO] [stderr]   --> src/bin/generator.rs:19:4
[INFO] [stderr]    |
[INFO] [stderr] 19 | fn get_opposite_dir(dir: Direction) -> Direction {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `shuffle_directions`
[INFO] [stderr]   --> src/bin/generator.rs:24:4
[INFO] [stderr]    |
[INFO] [stderr] 24 | fn shuffle_directions(directions: &mut Vec<Direction>) -> () {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `drunken_walk`
[INFO] [stderr]   --> src/bin/generator.rs:30:4
[INFO] [stderr]    |
[INFO] [stderr] 30 | fn drunken_walk(
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Direction`, `MazeRoom`, `initialize_maze`
[INFO] [stderr]  --> tests/integration_test.rs:1:27
[INFO] [stderr]   |
[INFO] [stderr] 1 | use rust_1_maze::common::{initialize_maze, Direction, MazeRoom};
[INFO] [stderr]   |                           ^^^^^^^^^^^^^^^  ^^^^^^^^^  ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `read_encoded_maze_from_file`, `write_encoded_maze_to_file`
[INFO] [stderr]  --> tests/integration_test.rs:2:19
[INFO] [stderr]   |
[INFO] [stderr] 2 | use rust_1_maze::{read_encoded_maze_from_file, write_encoded_maze_to_file};
[INFO] [stderr]   |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fs`
[INFO] [stderr]  --> tests/integration_test.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::fs;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `maze_room`
[INFO] [stderr]   --> src/bin/solver.rs:28:28
[INFO] [stderr]    |
[INFO] [stderr] 28 | fn create_room_connections(maze_room: &MazeRoom, hex: u8) -> () {}
[INFO] [stderr]    |                            ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_maze_room`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hex`
[INFO] [stderr]   --> src/bin/solver.rs:28:50
[INFO] [stderr]    |
[INFO] [stderr] 28 | fn create_room_connections(maze_room: &MazeRoom, hex: u8) -> () {}
[INFO] [stderr]    |                                                  ^^^ help: if this is intentional, prefix it with an underscore: `_hex`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `row`
[INFO] [stderr]   --> src/bin/solver.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     row: u8,
[INFO] [stderr]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `col`
[INFO] [stderr]   --> src/bin/solver.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     col: u8,
[INFO] [stderr]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_col`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `goal_row`
[INFO] [stderr]   --> src/bin/solver.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 33 |     goal_row: u8,
[INFO] [stderr]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_goal_row`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `goal_col`
[INFO] [stderr]   --> src/bin/solver.rs:34:5
[INFO] [stderr]    |
[INFO] [stderr] 34 |     goal_col: u8,
[INFO] [stderr]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_goal_col`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_rows`
[INFO] [stderr]   --> src/bin/solver.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     num_rows: u8,
[INFO] [stderr]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_cols`
[INFO] [stderr]   --> src/bin/solver.rs:36:5
[INFO] [stderr]    |
[INFO] [stderr] 36 |     num_cols: u8,
[INFO] [stderr]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `maze`
[INFO] [stderr]   --> src/bin/solver.rs:37:5
[INFO] [stderr]    |
[INFO] [stderr] 37 |     maze: Vec<Vec<MazeRoom>>,
[INFO] [stderr]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_maze`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `file`
[INFO] [stderr]   --> src/bin/solver.rs:38:5
[INFO] [stderr]    |
[INFO] [stderr] 38 |     file: &File,
[INFO] [stderr]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_file`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_rows`
[INFO] [stderr]   --> src/bin/solver.rs:44:5
[INFO] [stderr]    |
[INFO] [stderr] 44 |     num_rows: u8,
[INFO] [stderr]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_rows`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_cols`
[INFO] [stderr]   --> src/bin/solver.rs:45:5
[INFO] [stderr]    |
[INFO] [stderr] 45 |     num_cols: u8,
[INFO] [stderr]    |     ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_cols`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `maze`
[INFO] [stderr]   --> src/bin/solver.rs:46:5
[INFO] [stderr]    |
[INFO] [stderr] 46 |     maze: Vec<Vec<MazeRoom>>,
[INFO] [stderr]    |     ^^^^ help: if this is intentional, prefix it with an underscore: `_maze`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `encoded_maze`
[INFO] [stderr]   --> src/bin/solver.rs:47:5
[INFO] [stderr]    |
[INFO] [stderr] 47 |     encoded_maze: Vec<Vec<u8>>,
[INFO] [stderr]    |     ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_encoded_maze`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `room`
[INFO] [stderr]   --> src/bin/solver.rs:51:22
[INFO] [stderr]    |
[INFO] [stderr] 51 | fn print_pruned_path(room: &MazeRoom, file: &File) -> u8 {
[INFO] [stderr]    |                      ^^^^ help: if this is intentional, prefix it with an underscore: `_room`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `file`
[INFO] [stderr]   --> src/bin/solver.rs:51:39
[INFO] [stderr]    |
[INFO] [stderr] 51 | fn print_pruned_path(room: &MazeRoom, file: &File) -> u8 {
[INFO] [stderr]    |                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_file`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `create_room_connections`
[INFO] [stderr]   --> src/bin/solver.rs:28:4
[INFO] [stderr]    |
[INFO] [stderr] 28 | fn create_room_connections(maze_room: &MazeRoom, hex: u8) -> () {}
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `dfs`
[INFO] [stderr]   --> src/bin/solver.rs:30:4
[INFO] [stderr]    |
[INFO] [stderr] 30 | fn dfs(
[INFO] [stderr]    |    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `decode_maze`
[INFO] [stderr]   --> src/bin/solver.rs:43:4
[INFO] [stderr]    |
[INFO] [stderr] 43 | fn decode_maze(
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `print_pruned_path`
[INFO] [stderr]   --> src/bin/solver.rs:51:4
[INFO] [stderr]    |
[INFO] [stderr] 51 | fn print_pruned_path(room: &MazeRoom, file: &File) -> u8 {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_1_maze` (bin "generator") generated 9 warnings
[INFO] [stderr] warning: `rust_1_maze` (test "integration_test") generated 3 warnings
[INFO] [stderr] warning: `rust_1_maze` (bin "solver") generated 20 warnings
[INFO] [stderr] warning: `rust_1_maze` (bin "solver" test) generated 20 warnings (20 duplicates)
[INFO] [stderr] warning: `rust_1_maze` (bin "generator" test) generated 9 warnings (9 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/rust_1_maze-c145280867b04487)
[INFO] [stderr]      Running unittests src/bin/generator.rs (/opt/rustwide/target/debug/deps/generator-8496f0228d16e051)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test tests::test_initialize_maze ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/bin/solver.rs (/opt/rustwide/target/debug/deps/solver-1c1e62b340b8d1f2)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running tests/integration_test.rs (/opt/rustwide/target/debug/deps/integration_test-1d8ae84e069fea4b)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test_something ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests rust_1_maze
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "a6ad01467fd648cab799c225b6b77dfe09b6799d678f3d739e7c2687eca9c08c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a6ad01467fd648cab799c225b6b77dfe09b6799d678f3d739e7c2687eca9c08c", kill_on_drop: false }`
[INFO] [stdout] a6ad01467fd648cab799c225b6b77dfe09b6799d678f3d739e7c2687eca9c08c