[INFO] cloning repository https://github.com/DerLando/board-repr-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/DerLando/board-repr-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDerLando%2Fboard-repr-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDerLando%2Fboard-repr-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 29fdbe0ca70a740109d3184139b45a2e777daf72
[INFO] testing DerLando/board-repr-rs against 1.59.0 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDerLando%2Fboard-repr-rs" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/DerLando/board-repr-rs on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/DerLando/board-repr-rs
[INFO] finished tweaking git repo https://github.com/DerLando/board-repr-rs
[INFO] tweaked toml for git repo https://github.com/DerLando/board-repr-rs written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/DerLando/board-repr-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 174999ce47029ff12e6e92145590230da8913ea3b4e9e02ad6a65b4db46bf8dc
[INFO] running `Command { std: "docker" "start" "-a" "174999ce47029ff12e6e92145590230da8913ea3b4e9e02ad6a65b4db46bf8dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "174999ce47029ff12e6e92145590230da8913ea3b4e9e02ad6a65b4db46bf8dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "174999ce47029ff12e6e92145590230da8913ea3b4e9e02ad6a65b4db46bf8dc", kill_on_drop: false }`
[INFO] [stdout] 174999ce47029ff12e6e92145590230da8913ea3b4e9e02ad6a65b4db46bf8dc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ade1678d9cc26d6c13c66367b14513fad51d8834616c6b5fe589313cfee58114
[INFO] running `Command { std: "docker" "start" "-a" "ade1678d9cc26d6c13c66367b14513fad51d8834616c6b5fe589313cfee58114", kill_on_drop: false }`
[INFO] [stderr]    Compiling anyhow v1.0.33
[INFO] [stderr]    Compiling board-repr-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::num::ParseIntError`
[INFO] [stdout]  --> src/err/mod.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::num::ParseIntError;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::char::ParseCharError`
[INFO] [stdout]  --> src/err/mod.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::char::ParseCharError;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `InvalidRow`
[INFO] [stdout]  --> src/err/mod.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     InvalidRow(char),
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `InvalidCol`
[INFO] [stdout]  --> src/err/mod.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     InvalidCol(char),
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `InvalidLength`
[INFO] [stdout]   --> src/err/mod.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     InvalidLength(usize)
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated constant is never used: `VALID_ROWS`
[INFO] [stdout]   --> src/position.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     const VALID_ROWS: [char; 8] = ['1', '2', '3', '4', '5', '6', '7', '8'];
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated constant is never used: `VALID_COLS`
[INFO] [stdout]   --> src/position.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     const VALID_COLS: [char; 8] = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'];
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `parse`
[INFO] [stdout]   --> src/position.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     pub fn parse(position: &str) -> Result<Self> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `parse_row`
[INFO] [stdout]   --> src/position.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn parse_row(char: &char) -> Result<u8, PositionParseError> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `parse_col`
[INFO] [stdout]   --> src/position.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn parse_col(char: &char) -> Result<u8, PositionParseError> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `to_string`
[INFO] [stdout]   --> src/position.rs:33:12
[INFO] [stdout]    |
[INFO] [stdout] 33 |     pub fn to_string(&self) -> String {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `SquareBoard8x8`
[INFO] [stdout]  --> src/boards/squareboard_8x8.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct SquareBoard8x8 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/boards/squareboard_8x8.rs:13:18
[INFO] [stdout]    |
[INFO] [stdout] 13 |     pub const fn new() -> Self {
[INFO] [stdout]    |                  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `position_to_index`
[INFO] [stdout]   --> src/boards/squareboard_8x8.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 |     fn position_to_index(position: &Position) -> usize {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `square`
[INFO] [stdout]   --> src/boards/squareboard_8x8.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 |     fn square(&self, position: impl Into<Position>) -> &Option<Piece> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `WhitePawn`
[INFO] [stdout]  --> src/piece.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     WhitePawn,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `WhiteRook`
[INFO] [stdout]  --> src/piece.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     WhiteRook,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `WhiteKnight`
[INFO] [stdout]  --> src/piece.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     WhiteKnight,
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `WhiteBishop`
[INFO] [stdout]  --> src/piece.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     WhiteBishop,
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `WhiteQueen`
[INFO] [stdout]  --> src/piece.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     WhiteQueen,
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `WhiteKing`
[INFO] [stdout]  --> src/piece.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     WhiteKing,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `BlackPawn`
[INFO] [stdout]  --> src/piece.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     BlackPawn,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `BlackRook`
[INFO] [stdout]   --> src/piece.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     BlackRook,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `BlackKnight`
[INFO] [stdout]   --> src/piece.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     BlackKnight,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `BlackBishop`
[INFO] [stdout]   --> src/piece.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     BlackBishop,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `BlackQueen`
[INFO] [stdout]   --> src/piece.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     BlackQueen,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `BlackKing`
[INFO] [stdout]   --> src/piece.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     BlackKing,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.11s
[INFO] [stdout] warning: 27 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "ade1678d9cc26d6c13c66367b14513fad51d8834616c6b5fe589313cfee58114", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ade1678d9cc26d6c13c66367b14513fad51d8834616c6b5fe589313cfee58114", kill_on_drop: false }`
[INFO] [stdout] ade1678d9cc26d6c13c66367b14513fad51d8834616c6b5fe589313cfee58114
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a9015bc52c11f1ccb6079dc0b6355347d5c20d442c4533096fc10574cf3963a1
[INFO] running `Command { std: "docker" "start" "-a" "a9015bc52c11f1ccb6079dc0b6355347d5c20d442c4533096fc10574cf3963a1", kill_on_drop: false }`
[INFO] [stdout] warning: unused import: `std::num::ParseIntError`
[INFO] [stdout]  --> src/err/mod.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::num::ParseIntError;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::char::ParseCharError`
[INFO] [stdout]  --> src/err/mod.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::char::ParseCharError;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `InvalidRow`
[INFO] [stdout]  --> src/err/mod.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     InvalidRow(char),
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `InvalidCol`
[INFO] [stdout]  --> src/err/mod.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     InvalidCol(char),
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `InvalidLength`
[INFO] [stdout]   --> src/err/mod.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     InvalidLength(usize)
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated constant is never used: `VALID_ROWS`
[INFO] [stdout]   --> src/position.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     const VALID_ROWS: [char; 8] = ['1', '2', '3', '4', '5', '6', '7', '8'];
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated constant is never used: `VALID_COLS`
[INFO] [stdout]   --> src/position.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     const VALID_COLS: [char; 8] = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'];
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `parse`
[INFO] [stdout]   --> src/position.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     pub fn parse(position: &str) -> Result<Self> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `parse_row`
[INFO] [stdout]   --> src/position.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn parse_row(char: &char) -> Result<u8, PositionParseError> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `parse_col`
[INFO] [stdout]   --> src/position.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn parse_col(char: &char) -> Result<u8, PositionParseError> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `to_string`
[INFO] [stdout]   --> src/position.rs:33:12
[INFO] [stdout]    |
[INFO] [stdout] 33 |     pub fn to_string(&self) -> String {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `SquareBoard8x8`
[INFO] [stdout]  --> src/boards/squareboard_8x8.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct SquareBoard8x8 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/boards/squareboard_8x8.rs:13:18
[INFO] [stdout]    |
[INFO] [stdout] 13 |     pub const fn new() -> Self {
[INFO] [stdout]    |                  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `position_to_index`
[INFO] [stdout]   --> src/boards/squareboard_8x8.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 |     fn position_to_index(position: &Position) -> usize {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `square`
[INFO] [stdout]   --> src/boards/squareboard_8x8.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 |     fn square(&self, position: impl Into<Position>) -> &Option<Piece> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `WhitePawn`
[INFO] [stdout]  --> src/piece.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     WhitePawn,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `WhiteRook`
[INFO] [stdout]  --> src/piece.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     WhiteRook,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `WhiteKnight`
[INFO] [stdout]  --> src/piece.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     WhiteKnight,
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `WhiteBishop`
[INFO] [stdout]  --> src/piece.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     WhiteBishop,
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `WhiteQueen`
[INFO] [stdout]  --> src/piece.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     WhiteQueen,
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `WhiteKing`
[INFO] [stdout]  --> src/piece.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     WhiteKing,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `BlackPawn`
[INFO] [stdout]  --> src/piece.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     BlackPawn,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `BlackRook`
[INFO] [stdout]   --> src/piece.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     BlackRook,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `BlackKnight`
[INFO] [stdout]   --> src/piece.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     BlackKnight,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `BlackBishop`
[INFO] [stdout]   --> src/piece.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     BlackBishop,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `BlackQueen`
[INFO] [stdout]   --> src/piece.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     BlackQueen,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `BlackKing`
[INFO] [stdout]   --> src/piece.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     BlackKing,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling board-repr-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: 27 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::num::ParseIntError`
[INFO] [stdout]  --> src/err/mod.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::num::ParseIntError;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::char::ParseCharError`
[INFO] [stdout]  --> src/err/mod.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::char::ParseCharError;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `InvalidLength`
[INFO] [stdout]   --> src/err/mod.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     InvalidLength(usize)
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.38s
[INFO] running `Command { std: "docker" "inspect" "a9015bc52c11f1ccb6079dc0b6355347d5c20d442c4533096fc10574cf3963a1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a9015bc52c11f1ccb6079dc0b6355347d5c20d442c4533096fc10574cf3963a1", kill_on_drop: false }`
[INFO] [stdout] a9015bc52c11f1ccb6079dc0b6355347d5c20d442c4533096fc10574cf3963a1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 6734d325ba1e5558b5637657259bcff394ffe11df5d91c6c7dcf34e0e174abeb
[INFO] running `Command { std: "docker" "start" "-a" "6734d325ba1e5558b5637657259bcff394ffe11df5d91c6c7dcf34e0e174abeb", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stdout] 
[INFO] [stderr] warning: unused import: `std::num::ParseIntError`
[INFO] [stdout] running 2 tests
[INFO] [stderr]  --> src/err/mod.rs:2:5
[INFO] [stdout] test position::tests::parse_position ... ok
[INFO] [stderr]   |
[INFO] [stdout] test boards::squareboard_8x8::tests::query_initial_squares ... ok
[INFO] [stderr] 2 | use std::num::ParseIntError;
[INFO] [stdout] 
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]   |
[INFO] [stdout] 
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::char::ParseCharError`
[INFO] [stderr]  --> src/err/mod.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::char::ParseCharError;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `InvalidRow`
[INFO] [stderr]  --> src/err/mod.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     InvalidRow(char),
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `InvalidCol`
[INFO] [stderr]  --> src/err/mod.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     InvalidCol(char),
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `InvalidLength`
[INFO] [stderr]   --> src/err/mod.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     InvalidLength(usize)
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated constant is never used: `VALID_ROWS`
[INFO] [stderr]   --> src/position.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     const VALID_ROWS: [char; 8] = ['1', '2', '3', '4', '5', '6', '7', '8'];
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated constant is never used: `VALID_COLS`
[INFO] [stderr]   --> src/position.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     const VALID_COLS: [char; 8] = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'];
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `parse`
[INFO] [stderr]   --> src/position.rs:14:12
[INFO] [stderr]    |
[INFO] [stderr] 14 |     pub fn parse(position: &str) -> Result<Self> {
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `parse_row`
[INFO] [stderr]   --> src/position.rs:22:8
[INFO] [stderr]    |
[INFO] [stderr] 22 |     fn parse_row(char: &char) -> Result<u8, PositionParseError> {
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `parse_col`
[INFO] [stderr]   --> src/position.rs:27:8
[INFO] [stderr]    |
[INFO] [stderr] 27 |     fn parse_col(char: &char) -> Result<u8, PositionParseError> {
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `to_string`
[INFO] [stderr]   --> src/position.rs:33:12
[INFO] [stderr]    |
[INFO] [stderr] 33 |     pub fn to_string(&self) -> String {
[INFO] [stderr]    |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `SquareBoard8x8`
[INFO] [stderr]  --> src/boards/squareboard_8x8.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | struct SquareBoard8x8 {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/boards/squareboard_8x8.rs:13:18
[INFO] [stderr]    |
[INFO] [stderr] 13 |     pub const fn new() -> Self {
[INFO] [stderr]    |                  ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `position_to_index`
[INFO] [stderr]   --> src/boards/squareboard_8x8.rs:28:8
[INFO] [stderr]    |
[INFO] [stderr] 28 |     fn position_to_index(position: &Position) -> usize {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `square`
[INFO] [stderr]   --> src/boards/squareboard_8x8.rs:32:8
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn square(&self, position: impl Into<Position>) -> &Option<Piece> {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `WhitePawn`
[INFO] [stderr]  --> src/piece.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     WhitePawn,
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `WhiteRook`
[INFO] [stderr]  --> src/piece.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 |     WhiteRook,
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `WhiteKnight`
[INFO] [stderr]  --> src/piece.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     WhiteKnight,
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `WhiteBishop`
[INFO] [stderr]  --> src/piece.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 |     WhiteBishop,
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `WhiteQueen`
[INFO] [stderr]  --> src/piece.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     WhiteQueen,
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `WhiteKing`
[INFO] [stderr]  --> src/piece.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     WhiteKing,
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `BlackPawn`
[INFO] [stderr]  --> src/piece.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     BlackPawn,
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `BlackRook`
[INFO] [stderr]   --> src/piece.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     BlackRook,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `BlackKnight`
[INFO] [stderr]   --> src/piece.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     BlackKnight,
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `BlackBishop`
[INFO] [stderr]   --> src/piece.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     BlackBishop,
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `BlackQueen`
[INFO] [stderr]   --> src/piece.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     BlackQueen,
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `BlackKing`
[INFO] [stderr]   --> src/piece.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 |     BlackKing,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `board-repr-rs` (lib) generated 27 warnings
[INFO] [stderr] warning: variant is never constructed: `InvalidLength`
[INFO] [stderr]   --> src/err/mod.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     InvalidLength(usize)
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `board-repr-rs` (lib test) generated 3 warnings (2 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.20s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/board_repr_rs-64a52d2799c60a1b)
[INFO] [stderr]    Doc-tests board-repr-rs
[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" "6734d325ba1e5558b5637657259bcff394ffe11df5d91c6c7dcf34e0e174abeb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6734d325ba1e5558b5637657259bcff394ffe11df5d91c6c7dcf34e0e174abeb", kill_on_drop: false }`
[INFO] [stdout] 6734d325ba1e5558b5637657259bcff394ffe11df5d91c6c7dcf34e0e174abeb