[INFO] cloning repository https://github.com/Jaco26/rust_chess
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Jaco26/rust_chess" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJaco26%2Frust_chess", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJaco26%2Frust_chess'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4b4080d5882122a9b77569b7778064f4218ee675
[INFO] checking Jaco26/rust_chess against master#6526e5c772f2da07db745c94ca6bb0a591a39ba4 for pr-80920
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJaco26%2Frust_chess" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Jaco26/rust_chess on toolchain 6526e5c772f2da07db745c94ca6bb0a591a39ba4
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6526e5c772f2da07db745c94ca6bb0a591a39ba4" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Jaco26/rust_chess
[INFO] finished tweaking git repo https://github.com/Jaco26/rust_chess
[INFO] tweaked toml for git repo https://github.com/Jaco26/rust_chess written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/Jaco26/rust_chess already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6526e5c772f2da07db745c94ca6bb0a591a39ba4" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+6526e5c772f2da07db745c94ca6bb0a591a39ba4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] de574950ca2755918dc5b74f2290590c5bb2e5642e8a660350788c97b7d0b96f
[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" "de574950ca2755918dc5b74f2290590c5bb2e5642e8a660350788c97b7d0b96f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "de574950ca2755918dc5b74f2290590c5bb2e5642e8a660350788c97b7d0b96f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de574950ca2755918dc5b74f2290590c5bb2e5642e8a660350788c97b7d0b96f", kill_on_drop: false }`
[INFO] [stdout] de574950ca2755918dc5b74f2290590c5bb2e5642e8a660350788c97b7d0b96f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+6526e5c772f2da07db745c94ca6bb0a591a39ba4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] aa88fdc6828ee964c7a13d2bd97d03bee99048bf09979adbf7fc3bbdff31ce1c
[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" "aa88fdc6828ee964c7a13d2bd97d03bee99048bf09979adbf7fc3bbdff31ce1c", kill_on_drop: false }`
[INFO] [stderr]     Checking chess v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `crate::v3::scanner::stop_at_piece`
[INFO] [stdout]  --> src/v3/brain/pawn.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use crate::v3::scanner::stop_at_piece;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::v3::scanner::stop_at_piece`
[INFO] [stdout]  --> src/v3/brain/pawn.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use crate::v3::scanner::stop_at_piece;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Fork`, `Pin`
[INFO] [stdout]  --> src/v3/brain/scanner.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     Fork,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 8 |     Pin,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Fork`, `Pin`
[INFO] [stdout]  --> src/v3/brain/scanner.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     Fork,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 8 |     Pin,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Fork`, `Pin`
[INFO] [stdout]  --> src/v3/scanner.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Fork,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 6 |     Pin,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Fork`, `Pin`
[INFO] [stdout]  --> src/v3/scanner.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Fork,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 6 |     Pin,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Fork`, `Pin`
[INFO] [stdout]  --> src/v4/brain/bishop.rs:5:3
[INFO] [stdout]   |
[INFO] [stdout] 5 |   Pin,
[INFO] [stdout]   |   ^^^
[INFO] [stdout] 6 |   Fork,
[INFO] [stdout]   |   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Fork`, `Pin`
[INFO] [stdout]  --> src/v4/brain/bishop.rs:5:3
[INFO] [stdout]   |
[INFO] [stdout] 5 |   Pin,
[INFO] [stdout]   |   ^^^
[INFO] [stdout] 6 |   Fork,
[INFO] [stdout]   |   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tiles`
[INFO] [stdout]    --> src/v3/brain/pawn.rs:105:11
[INFO] [stdout]     |
[INFO] [stdout] 105 |   fn pins(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Pin> {
[INFO] [stdout]     |           ^^^^^ help: if this is intentional, prefix it with an underscore: `_tiles`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `board`
[INFO] [stdout]    --> src/v3/brain/pawn.rs:105:30
[INFO] [stdout]     |
[INFO] [stdout] 105 |   fn pins(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Pin> {
[INFO] [stdout]     |                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_board`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pieces`
[INFO] [stdout]    --> src/v3/brain/pawn.rs:105:45
[INFO] [stdout]     |
[INFO] [stdout] 105 |   fn pins(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Pin> {
[INFO] [stdout]     |                                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_pieces`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tiles`
[INFO] [stdout]    --> src/v3/brain/pawn.rs:110:12
[INFO] [stdout]     |
[INFO] [stdout] 110 |   fn forks(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Fork> {
[INFO] [stdout]     |            ^^^^^ help: if this is intentional, prefix it with an underscore: `_tiles`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `board`
[INFO] [stdout]    --> src/v3/brain/pawn.rs:110:31
[INFO] [stdout]     |
[INFO] [stdout] 110 |   fn forks(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Fork> {
[INFO] [stdout]     |                               ^^^^^ help: if this is intentional, prefix it with an underscore: `_board`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pieces`
[INFO] [stdout]    --> src/v3/brain/pawn.rs:110:46
[INFO] [stdout]     |
[INFO] [stdout] 110 |   fn forks(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Fork> {
[INFO] [stdout]     |                                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_pieces`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `history`
[INFO] [stdout]   --> src/v3/brain/knight.rs:19:64
[INFO] [stdout]    |
[INFO] [stdout] 19 |   fn scan_board(origin: usize, board: &Board, pieces: &Pieces, history: Option<&GameHistory>) -> Result<Vec<usize>, String> {
[INFO] [stdout]    |                                                                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_history`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `history`
[INFO] [stdout]   --> src/v3/brain/knight.rs:59:69
[INFO] [stdout]    |
[INFO] [stdout] 59 |   fn available_tiles(origin: usize, board: &Board, pieces: &Pieces, history: Option<&GameHistory>) -> Result<Vec<usize>, String> {
[INFO] [stdout]    |                                                                     ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_history`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tiles`
[INFO] [stdout]    --> src/v3/brain/knight.rs:100:11
[INFO] [stdout]     |
[INFO] [stdout] 100 |   fn pins(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Pin> {
[INFO] [stdout]     |           ^^^^^ help: if this is intentional, prefix it with an underscore: `_tiles`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `board`
[INFO] [stdout]    --> src/v3/brain/knight.rs:100:30
[INFO] [stdout]     |
[INFO] [stdout] 100 |   fn pins(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Pin> {
[INFO] [stdout]     |                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_board`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pieces`
[INFO] [stdout]    --> src/v3/brain/knight.rs:100:45
[INFO] [stdout]     |
[INFO] [stdout] 100 |   fn pins(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Pin> {
[INFO] [stdout]     |                                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_pieces`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tiles`
[INFO] [stdout]    --> src/v3/brain/knight.rs:105:12
[INFO] [stdout]     |
[INFO] [stdout] 105 |   fn forks(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Fork> {
[INFO] [stdout]     |            ^^^^^ help: if this is intentional, prefix it with an underscore: `_tiles`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `board`
[INFO] [stdout]    --> src/v3/brain/knight.rs:105:31
[INFO] [stdout]     |
[INFO] [stdout] 105 |   fn forks(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Fork> {
[INFO] [stdout]     |                               ^^^^^ help: if this is intentional, prefix it with an underscore: `_board`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pieces`
[INFO] [stdout]    --> src/v3/brain/knight.rs:105:46
[INFO] [stdout]     |
[INFO] [stdout] 105 |   fn forks(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Fork> {
[INFO] [stdout]     |                                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_pieces`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `history`
[INFO] [stdout]   --> src/v3/brain/bishop.rs:36:64
[INFO] [stdout]    |
[INFO] [stdout] 36 |   fn scan_board(origin: usize, board: &Board, pieces: &Pieces, history: Option<&GameHistory>) -> Result<Vec<usize>, String> {
[INFO] [stdout]    |                                                                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_history`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `origin`
[INFO] [stdout]    --> src/v3/scanner.rs:110:22
[INFO] [stdout]     |
[INFO] [stdout] 110 | pub fn stop_at_piece(origin: usize, tiles: &Vec<usize>, pieces: &Pieces) -> Vec<usize> {
[INFO] [stdout]     |                      ^^^^^^ help: if this is intentional, prefix it with an underscore: `_origin`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tiles`
[INFO] [stdout]    --> src/v3/brain/pawn.rs:105:11
[INFO] [stdout]     |
[INFO] [stdout] 105 |   fn pins(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Pin> {
[INFO] [stdout]     |           ^^^^^ help: if this is intentional, prefix it with an underscore: `_tiles`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `board`
[INFO] [stdout]    --> src/v3/brain/pawn.rs:105:30
[INFO] [stdout]     |
[INFO] [stdout] 105 |   fn pins(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Pin> {
[INFO] [stdout]     |                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_board`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pieces`
[INFO] [stdout]    --> src/v3/brain/pawn.rs:105:45
[INFO] [stdout]     |
[INFO] [stdout] 105 |   fn pins(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Pin> {
[INFO] [stdout]     |                                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_pieces`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tiles`
[INFO] [stdout]    --> src/v3/brain/pawn.rs:110:12
[INFO] [stdout]     |
[INFO] [stdout] 110 |   fn forks(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Fork> {
[INFO] [stdout]     |            ^^^^^ help: if this is intentional, prefix it with an underscore: `_tiles`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `board`
[INFO] [stdout]    --> src/v3/brain/pawn.rs:110:31
[INFO] [stdout]     |
[INFO] [stdout] 110 |   fn forks(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Fork> {
[INFO] [stdout]     |                               ^^^^^ help: if this is intentional, prefix it with an underscore: `_board`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pieces`
[INFO] [stdout]    --> src/v3/brain/pawn.rs:110:46
[INFO] [stdout]     |
[INFO] [stdout] 110 |   fn forks(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Fork> {
[INFO] [stdout]     |                                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_pieces`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `history`
[INFO] [stdout]   --> src/v3/brain/knight.rs:19:64
[INFO] [stdout]    |
[INFO] [stdout] 19 |   fn scan_board(origin: usize, board: &Board, pieces: &Pieces, history: Option<&GameHistory>) -> Result<Vec<usize>, String> {
[INFO] [stdout]    |                                                                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_history`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `history`
[INFO] [stdout]   --> src/v3/brain/knight.rs:59:69
[INFO] [stdout]    |
[INFO] [stdout] 59 |   fn available_tiles(origin: usize, board: &Board, pieces: &Pieces, history: Option<&GameHistory>) -> Result<Vec<usize>, String> {
[INFO] [stdout]    |                                                                     ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_history`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tiles`
[INFO] [stdout]    --> src/v3/brain/knight.rs:100:11
[INFO] [stdout]     |
[INFO] [stdout] 100 |   fn pins(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Pin> {
[INFO] [stdout]     |           ^^^^^ help: if this is intentional, prefix it with an underscore: `_tiles`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `board`
[INFO] [stdout]    --> src/v3/brain/knight.rs:100:30
[INFO] [stdout]     |
[INFO] [stdout] 100 |   fn pins(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Pin> {
[INFO] [stdout]     |                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_board`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pieces`
[INFO] [stdout]    --> src/v3/brain/knight.rs:100:45
[INFO] [stdout]     |
[INFO] [stdout] 100 |   fn pins(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Pin> {
[INFO] [stdout]     |                                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_pieces`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tiles`
[INFO] [stdout]    --> src/v3/brain/knight.rs:105:12
[INFO] [stdout]     |
[INFO] [stdout] 105 |   fn forks(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Fork> {
[INFO] [stdout]     |            ^^^^^ help: if this is intentional, prefix it with an underscore: `_tiles`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `board`
[INFO] [stdout]    --> src/v3/brain/knight.rs:105:31
[INFO] [stdout]     |
[INFO] [stdout] 105 |   fn forks(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Fork> {
[INFO] [stdout]     |                               ^^^^^ help: if this is intentional, prefix it with an underscore: `_board`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pieces`
[INFO] [stdout]    --> src/v3/brain/knight.rs:105:46
[INFO] [stdout]     |
[INFO] [stdout] 105 |   fn forks(tiles: Vec<usize>, board: &Board, pieces: &Pieces) -> Vec<Fork> {
[INFO] [stdout]     |                                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_pieces`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `history`
[INFO] [stdout]   --> src/v3/brain/bishop.rs:36:64
[INFO] [stdout]    |
[INFO] [stdout] 36 |   fn scan_board(origin: usize, board: &Board, pieces: &Pieces, history: Option<&GameHistory>) -> Result<Vec<usize>, String> {
[INFO] [stdout]    |                                                                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_history`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `origin`
[INFO] [stdout]    --> src/v3/scanner.rs:110:22
[INFO] [stdout]     |
[INFO] [stdout] 110 | pub fn stop_at_piece(origin: usize, tiles: &Vec<usize>, pieces: &Pieces) -> Vec<usize> {
[INFO] [stdout]     |                      ^^^^^^ help: if this is intentional, prefix it with an underscore: `_origin`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/v3/brain/knight.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |         let mut scans = directions
[INFO] [stdout]    |             ----^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/v3/brain/knight.rs:101:9
[INFO] [stdout]     |
[INFO] [stdout] 101 |     let mut rv = vec![];
[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/v3/brain/knight.rs:106:9
[INFO] [stdout]     |
[INFO] [stdout] 106 |     let mut rv = vec![];
[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/v3/brain/knight.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |         let mut scans = directions
[INFO] [stdout]    |             ----^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/v3/brain/knight.rs:101:9
[INFO] [stdout]     |
[INFO] [stdout] 101 |     let mut rv = vec![];
[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/v3/brain/knight.rs:106:9
[INFO] [stdout]     |
[INFO] [stdout] 106 |     let mut rv = vec![];
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `backward_direction`
[INFO] [stdout]   --> src/v3/piece.rs:79:10
[INFO] [stdout]    |
[INFO] [stdout] 79 |   pub fn backward_direction(&self) -> Direction {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `ScanCtx`
[INFO] [stdout]   --> src/v3/brain/bishop.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub struct ScanCtx<'a> {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `AbsolutePin`
[INFO] [stdout]   --> src/v3/brain/prelude.rs:34:3
[INFO] [stdout]    |
[INFO] [stdout] 34 |   AbsolutePin,
[INFO] [stdout]    |   ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `RelativePin`
[INFO] [stdout]   --> src/v3/brain/prelude.rs:35:3
[INFO] [stdout]    |
[INFO] [stdout] 35 |   RelativePin,
[INFO] [stdout]    |   ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `PartialPin`
[INFO] [stdout]   --> src/v3/brain/prelude.rs:36:3
[INFO] [stdout]    |
[INFO] [stdout] 36 |   PartialPin,
[INFO] [stdout]    |   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `SituationalPin`
[INFO] [stdout]   --> src/v3/brain/prelude.rs:37:3
[INFO] [stdout]    |
[INFO] [stdout] 37 |   SituationalPin,
[INFO] [stdout]    |   ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `origin`
[INFO] [stdout]    --> src/v3/brain/scanner.rs:122:3
[INFO] [stdout]     |
[INFO] [stdout] 122 |   origin: usize,
[INFO] [stdout]     |   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Brain`
[INFO] [stdout]   --> src/v3/brain/mod.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct Brain { }
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tile_vector`
[INFO] [stdout]   --> src/v3/scanner.rs:65:8
[INFO] [stdout]    |
[INFO] [stdout] 65 | pub fn tile_vector(origin: usize, directions: &Directions) -> Vec<usize> {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_pin`
[INFO] [stdout]    --> src/v3/scanner.rs:101:8
[INFO] [stdout]     |
[INFO] [stdout] 101 | pub fn some_pin() -> Option<usize> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_fork`
[INFO] [stdout]    --> src/v3/scanner.rs:106:8
[INFO] [stdout]     |
[INFO] [stdout] 106 | pub fn some_fork() {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `stop_at_piece`
[INFO] [stdout]    --> src/v3/scanner.rs:110:8
[INFO] [stdout]     |
[INFO] [stdout] 110 | pub fn stop_at_piece(origin: usize, tiles: &Vec<usize>, pieces: &Pieces) -> Vec<usize> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `points`
[INFO] [stdout]   --> src/v4/piece.rs:48:10
[INFO] [stdout]    |
[INFO] [stdout] 48 |   pub fn points(&self) -> Option<u8> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `row_at`
[INFO] [stdout]   --> src/v4/board.rs:38:10
[INFO] [stdout]    |
[INFO] [stdout] 38 |   pub fn row_at(&self, idx: usize) -> Option<usize> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `rank_of`
[INFO] [stdout]   --> src/v4/board.rs:47:10
[INFO] [stdout]    |
[INFO] [stdout] 47 |   pub fn rank_of(&self, piece: &ChessPiece) -> Option<usize> {
[INFO] [stdout]    |          ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `rank_of_index`
[INFO] [stdout]   --> src/v4/board.rs:53:10
[INFO] [stdout]    |
[INFO] [stdout] 53 |   pub fn rank_of_index(&self, idx: usize, color: &Color) -> Option<usize> {
[INFO] [stdout]    |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `last`
[INFO] [stdout]   --> src/v4/history.rs:36:10
[INFO] [stdout]    |
[INFO] [stdout] 36 |   pub fn last(&self) -> Option<&GameMove> {
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 40 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `backward_direction`
[INFO] [stdout]   --> src/v3/piece.rs:79:10
[INFO] [stdout]    |
[INFO] [stdout] 79 |   pub fn backward_direction(&self) -> Direction {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `ScanCtx`
[INFO] [stdout]   --> src/v3/brain/bishop.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub struct ScanCtx<'a> {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `AbsolutePin`
[INFO] [stdout]   --> src/v3/brain/prelude.rs:34:3
[INFO] [stdout]    |
[INFO] [stdout] 34 |   AbsolutePin,
[INFO] [stdout]    |   ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `RelativePin`
[INFO] [stdout]   --> src/v3/brain/prelude.rs:35:3
[INFO] [stdout]    |
[INFO] [stdout] 35 |   RelativePin,
[INFO] [stdout]    |   ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `PartialPin`
[INFO] [stdout]   --> src/v3/brain/prelude.rs:36:3
[INFO] [stdout]    |
[INFO] [stdout] 36 |   PartialPin,
[INFO] [stdout]    |   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `SituationalPin`
[INFO] [stdout]   --> src/v3/brain/prelude.rs:37:3
[INFO] [stdout]    |
[INFO] [stdout] 37 |   SituationalPin,
[INFO] [stdout]    |   ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `origin`
[INFO] [stdout]    --> src/v3/brain/scanner.rs:122:3
[INFO] [stdout]     |
[INFO] [stdout] 122 |   origin: usize,
[INFO] [stdout]     |   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Brain`
[INFO] [stdout]   --> src/v3/brain/mod.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct Brain { }
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tile_vector`
[INFO] [stdout]   --> src/v3/scanner.rs:65:8
[INFO] [stdout]    |
[INFO] [stdout] 65 | pub fn tile_vector(origin: usize, directions: &Directions) -> Vec<usize> {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_pin`
[INFO] [stdout]    --> src/v3/scanner.rs:101:8
[INFO] [stdout]     |
[INFO] [stdout] 101 | pub fn some_pin() -> Option<usize> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_fork`
[INFO] [stdout]    --> src/v3/scanner.rs:106:8
[INFO] [stdout]     |
[INFO] [stdout] 106 | pub fn some_fork() {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `stop_at_piece`
[INFO] [stdout]    --> src/v3/scanner.rs:110:8
[INFO] [stdout]     |
[INFO] [stdout] 110 | pub fn stop_at_piece(origin: usize, tiles: &Vec<usize>, pieces: &Pieces) -> Vec<usize> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `points`
[INFO] [stdout]   --> src/v4/piece.rs:48:10
[INFO] [stdout]    |
[INFO] [stdout] 48 |   pub fn points(&self) -> Option<u8> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `row_at`
[INFO] [stdout]   --> src/v4/board.rs:38:10
[INFO] [stdout]    |
[INFO] [stdout] 38 |   pub fn row_at(&self, idx: usize) -> Option<usize> {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `rank_of`
[INFO] [stdout]   --> src/v4/board.rs:47:10
[INFO] [stdout]    |
[INFO] [stdout] 47 |   pub fn rank_of(&self, piece: &ChessPiece) -> Option<usize> {
[INFO] [stdout]    |          ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `rank_of_index`
[INFO] [stdout]   --> src/v4/board.rs:53:10
[INFO] [stdout]    |
[INFO] [stdout] 53 |   pub fn rank_of_index(&self, idx: usize, color: &Color) -> Option<usize> {
[INFO] [stdout]    |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `last`
[INFO] [stdout]   --> src/v4/history.rs:36:10
[INFO] [stdout]    |
[INFO] [stdout] 36 |   pub fn last(&self) -> Option<&GameMove> {
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 40 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.90s
[INFO] running `Command { std: "docker" "inspect" "aa88fdc6828ee964c7a13d2bd97d03bee99048bf09979adbf7fc3bbdff31ce1c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa88fdc6828ee964c7a13d2bd97d03bee99048bf09979adbf7fc3bbdff31ce1c", kill_on_drop: false }`
[INFO] [stdout] aa88fdc6828ee964c7a13d2bd97d03bee99048bf09979adbf7fc3bbdff31ce1c