[INFO] cloning repository https://github.com/superosku/block-game-solver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/superosku/block-game-solver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsuperosku%2Fblock-game-solver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsuperosku%2Fblock-game-solver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f39d4c541ff53bd3b86ae693b370bf3071dd25f9
[INFO] testing superosku/block-game-solver against try#8de4c7234dd9b97c9d76b58671343fdbbc9a433e+target=x86_64-unknown-linux-musl for musl_upgrade_1_2_5_with_libc_patch_0
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsuperosku%2Fblock-game-solver" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/superosku/block-game-solver
[INFO] finished tweaking git repo https://github.com/superosku/block-game-solver
[INFO] tweaked toml for git repo https://github.com/superosku/block-game-solver written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/superosku/block-game-solver on toolchain 8de4c7234dd9b97c9d76b58671343fdbbc9a433e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/superosku/block-game-solver 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" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 164d284c757c5748501a5007cce401fd0f41ec300baa892893c2b765100bfa34
[INFO] running `Command { std: "docker" "start" "-a" "164d284c757c5748501a5007cce401fd0f41ec300baa892893c2b765100bfa34", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "164d284c757c5748501a5007cce401fd0f41ec300baa892893c2b765100bfa34", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "164d284c757c5748501a5007cce401fd0f41ec300baa892893c2b765100bfa34", kill_on_drop: false }`
[INFO] [stdout] 164d284c757c5748501a5007cce401fd0f41ec300baa892893c2b765100bfa34
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "build" "--frozen" "--message-format=json" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] 2fefd127a8427fff289b9955e697bf3acb97af4acf65b9aa479a5d845474211f
[INFO] running `Command { std: "docker" "start" "-a" "2fefd127a8427fff289b9955e697bf3acb97af4acf65b9aa479a5d845474211f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.112
[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 puzzle-solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/main.rs:337:5
[INFO] [stdout]     |
[INFO] [stdout] 324 | /     loop {
[INFO] [stdout] 325 | |         let random_value = rng.gen_range(0..(pieces.len()));
[INFO] [stdout] 326 | |         let random_piece = &pieces[random_value];
[INFO] [stdout] ...   |
[INFO] [stdout] 335 | |     }
[INFO] [stdout]     | |_____- any code following this expression is unreachable
[INFO] [stdout] 336 |
[INFO] [stdout] 337 |       piece_count
[INFO] [stdout]     |       ^^^^^^^^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> src/main.rs:6:44
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let min_x: i32 = piece.iter().map(|(x, y)| *x).min().unwrap();
[INFO] [stdout]   |                                            ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/main.rs:7:41
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let min_y: i32 = piece.iter().map(|(x, y)| *y).min().unwrap();
[INFO] [stdout]   |                                         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sum`
[INFO] [stdout]    --> src/main.rs:242:17
[INFO] [stdout]     |
[INFO] [stdout] 242 |         let mut sum = 0;
[INFO] [stdout]     |                 ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:242:13
[INFO] [stdout]     |
[INFO] [stdout] 242 |         let mut sum = 0;
[INFO] [stdout]     |             ----^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:284:9
[INFO] [stdout]     |
[INFO] [stdout] 284 |     for i in 0..3 {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `piece_count`
[INFO] [stdout]    --> src/main.rs:320:13
[INFO] [stdout]     |
[INFO] [stdout] 320 |     let mut piece_count = 0;
[INFO] [stdout]     |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_piece_count`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `best_values`
[INFO] [stdout]    --> src/main.rs:328:13
[INFO] [stdout]     |
[INFO] [stdout] 328 |         let best_values = (0, 0, 0);
[INFO] [stdout]     |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_best_values`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:320:9
[INFO] [stdout]     |
[INFO] [stdout] 320 |     let mut piece_count = 0;
[INFO] [stdout]     |         ----^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:321:9
[INFO] [stdout]     |
[INFO] [stdout] 321 |     let mut board = Board::new();
[INFO] [stdout]     |         ----^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `placement_out_of_bounds` is never used
[INFO] [stdout]    --> src/main.rs:135:8
[INFO] [stdout]     |
[INFO] [stdout] 107 | impl Board {
[INFO] [stdout]     | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 135 |     fn placement_out_of_bounds(&self, piece: &Piece, x: i32, y: i32) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `play_a_game_monte_carlo` is never used
[INFO] [stdout]    --> src/main.rs:318:4
[INFO] [stdout]     |
[INFO] [stdout] 318 | fn play_a_game_monte_carlo() -> i32 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.02s
[INFO] running `Command { std: "docker" "inspect" "2fefd127a8427fff289b9955e697bf3acb97af4acf65b9aa479a5d845474211f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2fefd127a8427fff289b9955e697bf3acb97af4acf65b9aa479a5d845474211f", kill_on_drop: false }`
[INFO] [stdout] 2fefd127a8427fff289b9955e697bf3acb97af4acf65b9aa479a5d845474211f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "test" "--frozen" "--no-run" "--message-format=json" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] 79dfa4f4896a830b7df4675596251de8a6bcb772f2ee83eb520e587c69b5f822
[INFO] running `Command { std: "docker" "start" "-a" "79dfa4f4896a830b7df4675596251de8a6bcb772f2ee83eb520e587c69b5f822", kill_on_drop: false }`
[INFO] [stderr]    Compiling puzzle-solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/main.rs:337:5
[INFO] [stdout]     |
[INFO] [stdout] 324 | /     loop {
[INFO] [stdout] 325 | |         let random_value = rng.gen_range(0..(pieces.len()));
[INFO] [stdout] 326 | |         let random_piece = &pieces[random_value];
[INFO] [stdout] ...   |
[INFO] [stdout] 335 | |     }
[INFO] [stdout]     | |_____- any code following this expression is unreachable
[INFO] [stdout] 336 |
[INFO] [stdout] 337 |       piece_count
[INFO] [stdout]     |       ^^^^^^^^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> src/main.rs:6:44
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let min_x: i32 = piece.iter().map(|(x, y)| *x).min().unwrap();
[INFO] [stdout]   |                                            ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/main.rs:7:41
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let min_y: i32 = piece.iter().map(|(x, y)| *y).min().unwrap();
[INFO] [stdout]   |                                         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sum`
[INFO] [stdout]    --> src/main.rs:242:17
[INFO] [stdout]     |
[INFO] [stdout] 242 |         let mut sum = 0;
[INFO] [stdout]     |                 ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:242:13
[INFO] [stdout]     |
[INFO] [stdout] 242 |         let mut sum = 0;
[INFO] [stdout]     |             ----^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:284:9
[INFO] [stdout]     |
[INFO] [stdout] 284 |     for i in 0..3 {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `piece_count`
[INFO] [stdout]    --> src/main.rs:320:13
[INFO] [stdout]     |
[INFO] [stdout] 320 |     let mut piece_count = 0;
[INFO] [stdout]     |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_piece_count`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `best_values`
[INFO] [stdout]    --> src/main.rs:328:13
[INFO] [stdout]     |
[INFO] [stdout] 328 |         let best_values = (0, 0, 0);
[INFO] [stdout]     |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_best_values`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:320:9
[INFO] [stdout]     |
[INFO] [stdout] 320 |     let mut piece_count = 0;
[INFO] [stdout]     |         ----^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:321:9
[INFO] [stdout]     |
[INFO] [stdout] 321 |     let mut board = Board::new();
[INFO] [stdout]     |         ----^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `placement_out_of_bounds` is never used
[INFO] [stdout]    --> src/main.rs:135:8
[INFO] [stdout]     |
[INFO] [stdout] 107 | impl Board {
[INFO] [stdout]     | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 135 |     fn placement_out_of_bounds(&self, piece: &Piece, x: i32, y: i32) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `play_a_game_monte_carlo` is never used
[INFO] [stdout]    --> src/main.rs:318:4
[INFO] [stdout]     |
[INFO] [stdout] 318 | fn play_a_game_monte_carlo() -> i32 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.58s
[INFO] running `Command { std: "docker" "inspect" "79dfa4f4896a830b7df4675596251de8a6bcb772f2ee83eb520e587c69b5f822", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "79dfa4f4896a830b7df4675596251de8a6bcb772f2ee83eb520e587c69b5f822", kill_on_drop: false }`
[INFO] [stdout] 79dfa4f4896a830b7df4675596251de8a6bcb772f2ee83eb520e587c69b5f822
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "test" "--frozen" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] 74e6373001dc77e536244b0409cf843e8a66b87098f7fad0d59bfaa6b217f88a
[INFO] running `Command { std: "docker" "start" "-a" "74e6373001dc77e536244b0409cf843e8a66b87098f7fad0d59bfaa6b217f88a", kill_on_drop: false }`
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/main.rs:337:5
[INFO] [stderr]     |
[INFO] [stderr] 324 | /     loop {
[INFO] [stderr] 325 | |         let random_value = rng.gen_range(0..(pieces.len()));
[INFO] [stderr] 326 | |         let random_piece = &pieces[random_value];
[INFO] [stderr] ...   |
[INFO] [stderr] 335 | |     }
[INFO] [stderr]     | |_____- any code following this expression is unreachable
[INFO] [stderr] 336 |
[INFO] [stderr] 337 |       piece_count
[INFO] [stderr]     |       ^^^^^^^^^^^ unreachable expression
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]  --> src/main.rs:6:44
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let min_x: i32 = piece.iter().map(|(x, y)| *x).min().unwrap();
[INFO] [stderr]   |                                            ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]  --> src/main.rs:7:41
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let min_y: i32 = piece.iter().map(|(x, y)| *y).min().unwrap();
[INFO] [stderr]   |                                         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sum`
[INFO] [stderr]    --> src/main.rs:242:17
[INFO] [stderr]     |
[INFO] [stderr] 242 |         let mut sum = 0;
[INFO] [stderr]     |                 ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:242:13
[INFO] [stderr]     |
[INFO] [stderr] 242 |         let mut sum = 0;
[INFO] [stderr]     |             ----^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/main.rs:284:9
[INFO] [stderr]     |
[INFO] [stderr] 284 |     for i in 0..3 {
[INFO] [stderr]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `piece_count`
[INFO] [stderr]    --> src/main.rs:320:13
[INFO] [stderr]     |
[INFO] [stderr] 320 |     let mut piece_count = 0;
[INFO] [stderr]     |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_piece_count`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `best_values`
[INFO] [stderr]    --> src/main.rs:328:13
[INFO] [stderr]     |
[INFO] [stderr] 328 |         let best_values = (0, 0, 0);
[INFO] [stderr]     |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_best_values`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:320:9
[INFO] [stderr]     |
[INFO] [stderr] 320 |     let mut piece_count = 0;
[INFO] [stderr]     |         ----^^^^^^^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:321:9
[INFO] [stderr]     |
[INFO] [stderr] 321 |     let mut board = Board::new();
[INFO] [stderr]     |         ----^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method `placement_out_of_bounds` is never used
[INFO] [stderr]    --> src/main.rs:135:8
[INFO] [stderr]     |
[INFO] [stderr] 107 | impl Board {
[INFO] [stderr]     | ---------- method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 135 |     fn placement_out_of_bounds(&self, piece: &Piece, x: i32, y: i32) -> bool {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `play_a_game_monte_carlo` is never used
[INFO] [stderr]    --> src/main.rs:318:4
[INFO] [stderr]     |
[INFO] [stderr] 318 | fn play_a_game_monte_carlo() -> i32 {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `puzzle-solver` (bin "puzzle-solver" test) generated 12 warnings (run `cargo fix --bin "puzzle-solver" --tests` to apply 3 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/x86_64-unknown-linux-musl/debug/deps/puzzle_solver-24f575036a5208f4)
[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" "74e6373001dc77e536244b0409cf843e8a66b87098f7fad0d59bfaa6b217f88a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "74e6373001dc77e536244b0409cf843e8a66b87098f7fad0d59bfaa6b217f88a", kill_on_drop: false }`
[INFO] [stdout] 74e6373001dc77e536244b0409cf843e8a66b87098f7fad0d59bfaa6b217f88a