[INFO] updating cached repository tomvidm/rust-sudoku-solver
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/tomvidm/rust-sudoku-solver
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/tomvidm/rust-sudoku-solver" "work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/tomvidm/rust-sudoku-solver"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/tomvidm/rust-sudoku-solver'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/tomvidm/rust-sudoku-solver" "work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/tomvidm/rust-sudoku-solver"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/tomvidm/rust-sudoku-solver'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9778d53891d8a991798dcffb2afeb743bbc9da94
[INFO] sha for GitHub repo tomvidm/rust-sudoku-solver: 9778d53891d8a991798dcffb2afeb743bbc9da94
[INFO] validating manifest of tomvidm/rust-sudoku-solver on toolchain master#a850a426491e14186af2250549bf41256b5938d2
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of tomvidm/rust-sudoku-solver on toolchain try#06a150c7d11500b41499224f165e9de1de096768
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing tomvidm/rust-sudoku-solver
[INFO] finished frobbing tomvidm/rust-sudoku-solver
[INFO] frobbed toml for tomvidm/rust-sudoku-solver written to work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/tomvidm/rust-sudoku-solver/Cargo.toml
[INFO] started frobbing tomvidm/rust-sudoku-solver
[INFO] finished frobbing tomvidm/rust-sudoku-solver
[INFO] frobbed toml for tomvidm/rust-sudoku-solver written to work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/tomvidm/rust-sudoku-solver/Cargo.toml
[INFO] crate tomvidm/rust-sudoku-solver already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking tomvidm/rust-sudoku-solver against master#a850a426491e14186af2250549bf41256b5938d2 for pr-60162
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60162/worker-4/master#a850a426491e14186af2250549bf41256b5938d2:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/tomvidm/rust-sudoku-solver:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 0beeb28f487184a66c21bfebb12641d325b3f20a337d638ae1743311f47fbd15
[INFO] running `"docker" "start" "-a" "0beeb28f487184a66c21bfebb12641d325b3f20a337d638ae1743311f47fbd15"`
[INFO] [stderr]    Compiling ryu v0.2.4
[INFO] [stderr]    Compiling serde v1.0.73
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling serde_derive v1.0.73
[INFO] [stderr]     Checking serde_json v1.0.26
[INFO] [stderr]     Checking sudoku v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `board`
[INFO] [stderr]   --> src/main.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let board = su::Board::new();
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_board`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `coord`
[INFO] [stderr]   --> src/su/board.rs:80:21
[INFO] [stderr]    |
[INFO] [stderr] 80 |                 let coord = Coord::new(r, c);
[INFO] [stderr]    |                     ^^^^^ help: consider prefixing with an underscore: `_coord`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `old_entry`
[INFO] [stderr]    --> src/su/board.rs:174:17
[INFO] [stderr]     |
[INFO] [stderr] 174 |             let old_entry = Move::new_from_coord_and_value(coord, old_value);
[INFO] [stderr]     |                 ^^^^^^^^^ help: consider prefixing with an underscore: `_old_entry`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `raw_board_struct`
[INFO] [stderr]   --> src/su/sugame.rs:31:13
[INFO] [stderr]    |
[INFO] [stderr] 31 |         let raw_board_struct = raw_board.clone();
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_raw_board_struct`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `board`
[INFO] [stderr]   --> src/main.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let board = su::Board::new();
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_board`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `board`
[INFO] [stderr]    --> src/su/board.rs:205:13
[INFO] [stderr]     |
[INFO] [stderr] 205 |     let mut board = Board::new_from_array(valid_raw_board);
[INFO] [stderr]     |             ^^^^^ help: consider prefixing with an underscore: `_board`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `coord`
[INFO] [stderr]   --> src/su/board.rs:80:21
[INFO] [stderr]    |
[INFO] [stderr] 80 |                 let coord = Coord::new(r, c);
[INFO] [stderr]    |                     ^^^^^ help: consider prefixing with an underscore: `_coord`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `old_entry`
[INFO] [stderr]    --> src/su/board.rs:174:17
[INFO] [stderr]     |
[INFO] [stderr] 174 |             let old_entry = Move::new_from_coord_and_value(coord, old_value);
[INFO] [stderr]     |                 ^^^^^^^^^ help: consider prefixing with an underscore: `_old_entry`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `game`
[INFO] [stderr]   --> src/su/sugame.rs:49:9
[INFO] [stderr]    |
[INFO] [stderr] 49 |     let game = Game::test_game();
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_game`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `raw_board_struct`
[INFO] [stderr]   --> src/su/sugame.rs:31:13
[INFO] [stderr]    |
[INFO] [stderr] 31 |         let raw_board_struct = raw_board.clone();
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_raw_board_struct`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/su/board.rs:205:9
[INFO] [stderr]     |
[INFO] [stderr] 205 |     let mut board = Board::new_from_array(valid_raw_board);
[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: field is never used: `data`
[INFO] [stderr]  --> src/su/sugame.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     data: [[i8; 9]; 9]
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Game`
[INFO] [stderr]   --> src/su/sugame.rs:12:1
[INFO] [stderr]    |
[INFO] [stderr] 12 | pub struct Game {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `test_game`
[INFO] [stderr]   --> src/su/sugame.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     fn test_game() -> Option<Game> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `data`
[INFO] [stderr]  --> src/su/sugame.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     data: [[i8; 9]; 9]
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `board`
[INFO] [stderr]   --> src/su/sugame.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     board: Board,
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 26.03s
[INFO] running `"docker" "inspect" "0beeb28f487184a66c21bfebb12641d325b3f20a337d638ae1743311f47fbd15"`
[INFO] running `"docker" "rm" "-f" "0beeb28f487184a66c21bfebb12641d325b3f20a337d638ae1743311f47fbd15"`
[INFO] [stdout] 0beeb28f487184a66c21bfebb12641d325b3f20a337d638ae1743311f47fbd15