[INFO] updating cached repository sebm/checkers
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/sebm/checkers
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/sebm/checkers" "work/ex/clippy-test-run/sources/stable/gh/sebm/checkers"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/sebm/checkers'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/sebm/checkers" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/sebm/checkers"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/sebm/checkers'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 07cce72a883f38ab9297467b91354fdcaacf8298
[INFO] sha for GitHub repo sebm/checkers: 07cce72a883f38ab9297467b91354fdcaacf8298
[INFO] validating manifest of sebm/checkers on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of sebm/checkers on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing sebm/checkers
[INFO] finished frobbing sebm/checkers
[INFO] frobbed toml for sebm/checkers written to work/ex/clippy-test-run/sources/stable/gh/sebm/checkers/Cargo.toml
[INFO] started frobbing sebm/checkers
[INFO] finished frobbing sebm/checkers
[INFO] frobbed toml for sebm/checkers written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/sebm/checkers/Cargo.toml
[INFO] crate sebm/checkers has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] linting sebm/checkers against stable+rustflags=-Dclippy::into_iter_on_array for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-0/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/sebm/checkers:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/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 -Dclippy::into_iter_on_array" "-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" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 06b9a12325b9097f43418acba66e95f037b6bad0aaec1574c2bdbb77a1f40332
[INFO] running `"docker" "start" "-a" "06b9a12325b9097f43418acba66e95f037b6bad0aaec1574c2bdbb77a1f40332"`
[INFO] [stderr]     Checking checkers v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: using `print!()` with a format string that ends in a single newline, consider using `println!()` instead
[INFO] [stderr]   --> src/board.rs:97:5
[INFO] [stderr]    |
[INFO] [stderr] 97 |     print!("═══╗\n");
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] warning: using `print!()` with a format string that ends in a single newline, consider using `println!()` instead
[INFO] [stderr]   --> src/board.rs:97:5
[INFO] [stderr]    |
[INFO] [stderr] 97 |     print!("═══╗\n");
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::print_with_newline)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stderr] 
[INFO] [stderr] warning: using `print!()` with a format string that ends in a single newline, consider using `println!()` instead
[INFO] [stderr]    --> src/board.rs:103:9
[INFO] [stderr]     |
[INFO] [stderr] 103 |         print!("║{}\n", i);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stderr] 
[INFO] [stderr] warning: using `print!()` with a format string that ends in a single newline, consider using `println!()` instead
[INFO] [stderr]    --> src/board.rs:109:5
[INFO] [stderr]     |
[INFO] [stderr] 109 |     print!("═══╝\n");
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stderr] 
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::print_with_newline)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stderr] 
[INFO] [stderr] warning: using `print!()` with a format string that ends in a single newline, consider using `println!()` instead
[INFO] [stderr]    --> src/board.rs:103:9
[INFO] [stderr]     |
[INFO] [stderr] 103 |         print!("║{}\n", i);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stderr] 
[INFO] [stderr] warning: using `print!()` with a format string that ends in a single newline, consider using `println!()` instead
[INFO] [stderr]    --> src/board.rs:109:5
[INFO] [stderr]     |
[INFO] [stderr] 109 |     print!("═══╝\n");
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/board.rs:27:5
[INFO] [stderr]    |
[INFO] [stderr] 27 | /     return [[BoardSquare::Empty,
[INFO] [stderr] 28 | |              BoardSquare::ManRed,
[INFO] [stderr] 29 | |              BoardSquare::Empty,
[INFO] [stderr] 30 | |              BoardSquare::ManRed,
[INFO] [stderr] ...  |
[INFO] [stderr] 75 | |              BoardSquare::ManWhite,
[INFO] [stderr] 76 | |              BoardSquare::Empty]];
[INFO] [stderr]    | |__________________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] help: remove `return` as shown
[INFO] [stderr]    |
[INFO] [stderr] 27 |     [[BoardSquare::Empty,
[INFO] [stderr] 28 |              BoardSquare::ManRed,
[INFO] [stderr] 29 |              BoardSquare::Empty,
[INFO] [stderr] 30 |              BoardSquare::ManRed,
[INFO] [stderr] 31 |              BoardSquare::Empty,
[INFO] [stderr] 32 |              BoardSquare::ManRed,
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/board.rs:84:5
[INFO] [stderr]    |
[INFO] [stderr] 84 |     return board;
[INFO] [stderr]    |     ^^^^^^^^^^^^^ help: remove `return` as shown: `board`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `initial_board`
[INFO] [stderr]  --> src/main.rs:4:26
[INFO] [stderr]   |
[INFO] [stderr] 4 | use board::{BoardSquare, initial_board, draw_board};
[INFO] [stderr]   |                          ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/main.rs:70:5
[INFO] [stderr]    |
[INFO] [stderr] 70 |     return moves;
[INFO] [stderr]    |     ^^^^^^^^^^^^^ help: remove `return` as shown: `moves`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/board.rs:27:5
[INFO] [stderr]    |
[INFO] [stderr] 27 | /     return [[BoardSquare::Empty,
[INFO] [stderr] 28 | |              BoardSquare::ManRed,
[INFO] [stderr] 29 | |              BoardSquare::Empty,
[INFO] [stderr] 30 | |              BoardSquare::ManRed,
[INFO] [stderr] ...  |
[INFO] [stderr] 75 | |              BoardSquare::ManWhite,
[INFO] [stderr] 76 | |              BoardSquare::Empty]];
[INFO] [stderr]    | |__________________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] help: remove `return` as shown
[INFO] [stderr]    |
[INFO] [stderr] 27 |     [[BoardSquare::Empty,
[INFO] [stderr] 28 |              BoardSquare::ManRed,
[INFO] [stderr] 29 |              BoardSquare::Empty,
[INFO] [stderr] 30 |              BoardSquare::ManRed,
[INFO] [stderr] 31 |              BoardSquare::Empty,
[INFO] [stderr] 32 |              BoardSquare::ManRed,
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/board.rs:84:5
[INFO] [stderr]    |
[INFO] [stderr] 84 |     return board;
[INFO] [stderr]    |     ^^^^^^^^^^^^^ help: remove `return` as shown: `board`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `initial_board`
[INFO] [stderr]  --> src/main.rs:4:26
[INFO] [stderr]   |
[INFO] [stderr] 4 | use board::{BoardSquare, initial_board, draw_board};
[INFO] [stderr]   |                          ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/main.rs:70:5
[INFO] [stderr]    |
[INFO] [stderr] 70 |     return moves;
[INFO] [stderr]    |     ^^^^^^^^^^^^^ help: remove `return` as shown: `moves`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `initial_board`
[INFO] [stderr]   --> src/board.rs:26:1
[INFO] [stderr]    |
[INFO] [stderr] 26 | pub fn initial_board() -> [[BoardSquare; 8]; 8] {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/main.rs:9:13
[INFO] [stderr]    |
[INFO] [stderr] 9  | /             match board[x+1][y-1] {
[INFO] [stderr] 10 | |                 BoardSquare::Empty => {
[INFO] [stderr] 11 | |                     moves.push((x+1, y-1));
[INFO] [stderr] 12 | |                 },
[INFO] [stderr] ...  |
[INFO] [stderr] 15 | |                 }
[INFO] [stderr] 16 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::single_match)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 9  |             if let BoardSquare::Empty = board[x+1][y-1] {
[INFO] [stderr] 10 |     moves.push((x+1, y-1));
[INFO] [stderr] 11 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/main.rs:19:13
[INFO] [stderr]    |
[INFO] [stderr] 19 | /             match board[x+1][y+1] {
[INFO] [stderr] 20 | |                 BoardSquare::Empty => {
[INFO] [stderr] 21 | |                     moves.push((x+1, y+1));
[INFO] [stderr] 22 | |                 },
[INFO] [stderr] ...  |
[INFO] [stderr] 25 | |                 }
[INFO] [stderr] 26 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 19 |             if let BoardSquare::Empty = board[x+1][y+1] {
[INFO] [stderr] 20 |     moves.push((x+1, y+1));
[INFO] [stderr] 21 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/main.rs:32:13
[INFO] [stderr]    |
[INFO] [stderr] 32 | /             match board[x-1][y-1] {
[INFO] [stderr] 33 | |                 BoardSquare::Empty => {
[INFO] [stderr] 34 | |                     moves.push((x-1, y-1))
[INFO] [stderr] 35 | |                 },
[INFO] [stderr] ...  |
[INFO] [stderr] 38 | |                 }
[INFO] [stderr] 39 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 32 |             if let BoardSquare::Empty = board[x-1][y-1] {
[INFO] [stderr] 33 |     moves.push((x-1, y-1))
[INFO] [stderr] 34 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/main.rs:42:13
[INFO] [stderr]    |
[INFO] [stderr] 42 | /             match board[x-1][y+1] {
[INFO] [stderr] 43 | |                 BoardSquare::Empty => {
[INFO] [stderr] 44 | |                     moves.push((x-1, y+1));
[INFO] [stderr] 45 | |                 },
[INFO] [stderr] ...  |
[INFO] [stderr] 48 | |                 }
[INFO] [stderr] 49 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 42 |             if let BoardSquare::Empty = board[x-1][y+1] {
[INFO] [stderr] 43 |     moves.push((x-1, y+1));
[INFO] [stderr] 44 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/main.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let ref piece = board[x][y];
[INFO] [stderr]    |     ----^^^^^^^^^--------------- help: try: `let piece = &board[x][y];`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::toplevel_ref_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/main.rs:109:12
[INFO] [stderr]     |
[INFO] [stderr] 109 |         if moves.len() == 0 {
[INFO] [stderr]     |            ^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `moves.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::len_zero)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `initial_board`
[INFO] [stderr]   --> src/board.rs:26:1
[INFO] [stderr]    |
[INFO] [stderr] 26 | pub fn initial_board() -> [[BoardSquare; 8]; 8] {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/main.rs:9:13
[INFO] [stderr]    |
[INFO] [stderr] 9  | /             match board[x+1][y-1] {
[INFO] [stderr] 10 | |                 BoardSquare::Empty => {
[INFO] [stderr] 11 | |                     moves.push((x+1, y-1));
[INFO] [stderr] 12 | |                 },
[INFO] [stderr] ...  |
[INFO] [stderr] 15 | |                 }
[INFO] [stderr] 16 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::single_match)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 9  |             if let BoardSquare::Empty = board[x+1][y-1] {
[INFO] [stderr] 10 |     moves.push((x+1, y-1));
[INFO] [stderr] 11 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/main.rs:19:13
[INFO] [stderr]    |
[INFO] [stderr] 19 | /             match board[x+1][y+1] {
[INFO] [stderr] 20 | |                 BoardSquare::Empty => {
[INFO] [stderr] 21 | |                     moves.push((x+1, y+1));
[INFO] [stderr] 22 | |                 },
[INFO] [stderr] ...  |
[INFO] [stderr] 25 | |                 }
[INFO] [stderr] 26 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 19 |             if let BoardSquare::Empty = board[x+1][y+1] {
[INFO] [stderr] 20 |     moves.push((x+1, y+1));
[INFO] [stderr] 21 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/main.rs:32:13
[INFO] [stderr]    |
[INFO] [stderr] 32 | /             match board[x-1][y-1] {
[INFO] [stderr] 33 | |                 BoardSquare::Empty => {
[INFO] [stderr] 34 | |                     moves.push((x-1, y-1))
[INFO] [stderr] 35 | |                 },
[INFO] [stderr] ...  |
[INFO] [stderr] 38 | |                 }
[INFO] [stderr] 39 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 32 |             if let BoardSquare::Empty = board[x-1][y-1] {
[INFO] [stderr] 33 |     moves.push((x-1, y-1))
[INFO] [stderr] 34 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/main.rs:42:13
[INFO] [stderr]    |
[INFO] [stderr] 42 | /             match board[x-1][y+1] {
[INFO] [stderr] 43 | |                 BoardSquare::Empty => {
[INFO] [stderr] 44 | |                     moves.push((x-1, y+1));
[INFO] [stderr] 45 | |                 },
[INFO] [stderr] ...  |
[INFO] [stderr] 48 | |                 }
[INFO] [stderr] 49 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 42 |             if let BoardSquare::Empty = board[x-1][y+1] {
[INFO] [stderr] 43 |     moves.push((x-1, y+1));
[INFO] [stderr] 44 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/main.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let ref piece = board[x][y];
[INFO] [stderr]    |     ----^^^^^^^^^--------------- help: try: `let piece = &board[x][y];`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::toplevel_ref_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/main.rs:109:12
[INFO] [stderr]     |
[INFO] [stderr] 109 |         if moves.len() == 0 {
[INFO] [stderr]     |            ^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `moves.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::len_zero)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.84s
[INFO] running `"docker" "inspect" "06b9a12325b9097f43418acba66e95f037b6bad0aaec1574c2bdbb77a1f40332"`
[INFO] running `"docker" "rm" "-f" "06b9a12325b9097f43418acba66e95f037b6bad0aaec1574c2bdbb77a1f40332"`
[INFO] [stdout] 06b9a12325b9097f43418acba66e95f037b6bad0aaec1574c2bdbb77a1f40332