[INFO] cloning repository https://github.com/four18teapot/rs_chess
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/four18teapot/rs_chess" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffour18teapot%2Frs_chess", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffour18teapot%2Frs_chess'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a169c04b47f740c0e1ebdccdebd2857659c1ce3c
[INFO] checking four18teapot/rs_chess against try#ae258e1fcbee4a062f5f3d869f06004d7cea088e for pr-135272
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffour18teapot%2Frs_chess" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/four18teapot/rs_chess on toolchain ae258e1fcbee4a062f5f3d869f06004d7cea088e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ae258e1fcbee4a062f5f3d869f06004d7cea088e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/four18teapot/rs_chess
[INFO] finished tweaking git repo https://github.com/four18teapot/rs_chess
[INFO] tweaked toml for git repo https://github.com/four18teapot/rs_chess written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/four18teapot/rs_chess 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" "+ae258e1fcbee4a062f5f3d869f06004d7cea088e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking four18teapot/rs_chess against try#ae258e1fcbee4a062f5f3d869f06004d7cea088e for pr-135272
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffour18teapot%2Frs_chess" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/four18teapot/rs_chess on toolchain ae258e1fcbee4a062f5f3d869f06004d7cea088e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ae258e1fcbee4a062f5f3d869f06004d7cea088e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/four18teapot/rs_chess
[INFO] finished tweaking git repo https://github.com/four18teapot/rs_chess
[INFO] tweaked toml for git repo https://github.com/four18teapot/rs_chess written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/four18teapot/rs_chess 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" "+ae258e1fcbee4a062f5f3d869f06004d7cea088e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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@sha256:819108c5571ea2e421544af4d832f968d213c87fbe3707a016657f43d2f853bc" "/opt/rustwide/cargo-home/bin/cargo" "+ae258e1fcbee4a062f5f3d869f06004d7cea088e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b78ca8a04f226d575dc44d91f7e30927cd40058b9ca7e82c59624a4e25ef96c0
[INFO] running `Command { std: "docker" "start" "-a" "b78ca8a04f226d575dc44d91f7e30927cd40058b9ca7e82c59624a4e25ef96c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b78ca8a04f226d575dc44d91f7e30927cd40058b9ca7e82c59624a4e25ef96c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b78ca8a04f226d575dc44d91f7e30927cd40058b9ca7e82c59624a4e25ef96c0", kill_on_drop: false }`
[INFO] [stdout] b78ca8a04f226d575dc44d91f7e30927cd40058b9ca7e82c59624a4e25ef96c0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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@sha256:819108c5571ea2e421544af4d832f968d213c87fbe3707a016657f43d2f853bc" "/opt/rustwide/cargo-home/bin/cargo" "+ae258e1fcbee4a062f5f3d869f06004d7cea088e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ec3dc215736547d32f073e0a72fb72f621b1777818c6d709090b6aab604b09e4
[INFO] running `Command { std: "docker" "start" "-a" "ec3dc215736547d32f073e0a72fb72f621b1777818c6d709090b6aab604b09e4", kill_on_drop: false }`
[INFO] [stderr]     Checking rs_chess v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `rand`
[INFO] [stdout]  --> src/hasher.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rand::prelude::*;
[INFO] [stdout]   |     ^^^^ use of undeclared crate or module `rand`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `rand`
[INFO] [stdout]  --> src/hasher.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rand::prelude::*;
[INFO] [stdout]   |     ^^^^ use of undeclared crate or module `rand`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `rand`
[INFO] [stdout]   --> src/hasher.rs:21:22
[INFO] [stdout]    |
[INFO] [stdout] 21 |         table[piece][sq] = rand::random::<HashKey>();
[INFO] [stdout]    |                            ^^^^ use of undeclared crate or module `rand`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `rand`
[INFO] [stdout]   --> src/hasher.rs:21:22
[INFO] [stdout]    |
[INFO] [stdout] 21 |         table[piece][sq] = rand::random::<HashKey>();
[INFO] [stdout]    |                            ^^^^ use of undeclared crate or module `rand`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0616]: field `board` of struct `board::Board` is private
[INFO] [stdout]   --> src/hasher.rs:32:20
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let piece = b.board[sq];
[INFO] [stdout]    |                       ^^^^^ private field
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0616]: field `board` of struct `board::Board` is private
[INFO] [stdout]   --> src/hasher.rs:32:20
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let piece = b.board[sq];
[INFO] [stdout]    |                       ^^^^^ private field
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `board`
[INFO] [stdout]    --> src/board.rs:138:10
[INFO] [stdout]     |
[INFO] [stdout] 138 |     let mut board = BOARD_EMPTY;
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_board`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `en_passant`
[INFO] [stdout]    --> src/board.rs:141:10
[INFO] [stdout]     |
[INFO] [stdout] 141 |     let mut en_passant: Option<Square> = None;
[INFO] [stdout]     |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_en_passant`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `side` is assigned to, but never used
[INFO] [stdout]    --> src/board.rs:142:10
[INFO] [stdout]     |
[INFO] [stdout] 142 |     let mut side = 0;
[INFO] [stdout]     |             ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_side` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `moves`
[INFO] [stdout]    --> src/board.rs:143:10
[INFO] [stdout]     |
[INFO] [stdout] 143 |     let mut moves = 0;
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_moves`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fifty_moves`
[INFO] [stdout]    --> src/board.rs:144:10
[INFO] [stdout]     |
[INFO] [stdout] 144 |     let mut fifty_moves = 0;
[INFO] [stdout]     |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_fifty_moves`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key_history`
[INFO] [stdout]    --> src/board.rs:145:10
[INFO] [stdout]     |
[INFO] [stdout] 145 |     let mut key_history = [0; 2048];
[INFO] [stdout]     |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_key_history`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `move_history`
[INFO] [stdout]    --> src/board.rs:146:10
[INFO] [stdout]     |
[INFO] [stdout] 146 |     let mut move_history = [Move::NoMove; 2048];
[INFO] [stdout]     |             ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_move_history`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `side` is never read
[INFO] [stdout]    --> src/board.rs:194:2
[INFO] [stdout]     |
[INFO] [stdout] 194 |     side = match fen_byte.get(byte_idx) {
[INFO] [stdout]     |     ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `byte_idx` is never read
[INFO] [stdout]    --> src/board.rs:213:2
[INFO] [stdout]     |
[INFO] [stdout] 213 |     byte_idx += 1;
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/board.rs:138:6
[INFO] [stdout]     |
[INFO] [stdout] 138 |     let mut board = BOARD_EMPTY;
[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/board.rs:141:6
[INFO] [stdout]     |
[INFO] [stdout] 141 |     let mut en_passant: Option<Square> = None;
[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/board.rs:143:6
[INFO] [stdout]     |
[INFO] [stdout] 143 |     let mut moves = 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/board.rs:144:6
[INFO] [stdout]     |
[INFO] [stdout] 144 |     let mut fifty_moves = 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/board.rs:145:6
[INFO] [stdout]     |
[INFO] [stdout] 145 |     let mut key_history = [0; 2048];
[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/board.rs:146:6
[INFO] [stdout]     |
[INFO] [stdout] 146 |     let mut move_history = [Move::NoMove; 2048];
[INFO] [stdout]     |         ----^^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `moves`
[INFO] [stdout]    --> src/board.rs:218:10
[INFO] [stdout]     |
[INFO] [stdout] 218 |     let mut moves: Vec<Move> = Vec::new();
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_moves`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/board.rs:218:6
[INFO] [stdout]     |
[INFO] [stdout] 218 |     let mut moves: Vec<Move> = Vec::new();
[INFO] [stdout]     |         ----^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `board`
[INFO] [stdout]    --> src/board.rs:138:10
[INFO] [stdout]     |
[INFO] [stdout] 138 |     let mut board = BOARD_EMPTY;
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_board`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `en_passant`
[INFO] [stdout]    --> src/board.rs:141:10
[INFO] [stdout]     |
[INFO] [stdout] 141 |     let mut en_passant: Option<Square> = None;
[INFO] [stdout]     |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_en_passant`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `side` is assigned to, but never used
[INFO] [stdout]    --> src/board.rs:142:10
[INFO] [stdout]     |
[INFO] [stdout] 142 |     let mut side = 0;
[INFO] [stdout]     |             ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_side` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `moves`
[INFO] [stdout]    --> src/board.rs:143:10
[INFO] [stdout]     |
[INFO] [stdout] 143 |     let mut moves = 0;
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_moves`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fifty_moves`
[INFO] [stdout]    --> src/board.rs:144:10
[INFO] [stdout]     |
[INFO] [stdout] 144 |     let mut fifty_moves = 0;
[INFO] [stdout]     |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_fifty_moves`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key_history`
[INFO] [stdout]    --> src/board.rs:145:10
[INFO] [stdout]     |
[INFO] [stdout] 145 |     let mut key_history = [0; 2048];
[INFO] [stdout]     |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_key_history`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `move_history`
[INFO] [stdout]    --> src/board.rs:146:10
[INFO] [stdout]     |
[INFO] [stdout] 146 |     let mut move_history = [Move::NoMove; 2048];
[INFO] [stdout]     |             ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_move_history`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `side` is never read
[INFO] [stdout]    --> src/board.rs:194:2
[INFO] [stdout]     |
[INFO] [stdout] 194 |     side = match fen_byte.get(byte_idx) {
[INFO] [stdout]     |     ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `byte_idx` is never read
[INFO] [stdout]    --> src/board.rs:213:2
[INFO] [stdout]     |
[INFO] [stdout] 213 |     byte_idx += 1;
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/board.rs:138:6
[INFO] [stdout]     |
[INFO] [stdout] 138 |     let mut board = BOARD_EMPTY;
[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/board.rs:141:6
[INFO] [stdout]     |
[INFO] [stdout] 141 |     let mut en_passant: Option<Square> = None;
[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/board.rs:143:6
[INFO] [stdout]     |
[INFO] [stdout] 143 |     let mut moves = 0;
[INFO] [stdout]     |         ----^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `alg`
[INFO] [stdout]    --> src/board.rs:285:24
[INFO] [stdout]     |
[INFO] [stdout] 285 | fn algebraic_to_square(alg: &str) -> Option<Square> {
[INFO] [stdout]     |                        ^^^ help: if this is intentional, prefix it with an underscore: `_alg`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/board.rs:144:6
[INFO] [stdout]     |
[INFO] [stdout] 144 |     let mut fifty_moves = 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/board.rs:145:6
[INFO] [stdout]     |
[INFO] [stdout] 145 |     let mut key_history = [0; 2048];
[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/board.rs:146:6
[INFO] [stdout]     |
[INFO] [stdout] 146 |     let mut move_history = [Move::NoMove; 2048];
[INFO] [stdout]     |         ----^^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `moves`
[INFO] [stdout]    --> src/board.rs:218:10
[INFO] [stdout]     |
[INFO] [stdout] 218 |     let mut moves: Vec<Move> = Vec::new();
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_moves`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/board.rs:218:6
[INFO] [stdout]     |
[INFO] [stdout] 218 |     let mut moves: Vec<Move> = Vec::new();
[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:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut b = Board::new_starting();
[INFO] [stdout]   |         ----^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `alg`
[INFO] [stdout]    --> src/board.rs:285:24
[INFO] [stdout]     |
[INFO] [stdout] 285 | fn algebraic_to_square(alg: &str) -> Option<Square> {
[INFO] [stdout]     |                        ^^^ help: if this is intentional, prefix it with an underscore: `_alg`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0433, E0616.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut b = Board::new_starting();
[INFO] [stdout]   |         ----^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0433, E0616.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rs_chess` (bin "rs_chess") due to 3 previous errors; 19 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `rs_chess` (bin "rs_chess" test) due to 3 previous errors; 19 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "ec3dc215736547d32f073e0a72fb72f621b1777818c6d709090b6aab604b09e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ec3dc215736547d32f073e0a72fb72f621b1777818c6d709090b6aab604b09e4", kill_on_drop: false }`
[INFO] [stdout] ec3dc215736547d32f073e0a72fb72f621b1777818c6d709090b6aab604b09e4
