[INFO] updating cached repository KOBA789/rust-reversi
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/KOBA789/rust-reversi
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/KOBA789/rust-reversi" "work/ex/clippy-test-run/sources/stable/gh/KOBA789/rust-reversi"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/KOBA789/rust-reversi'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/KOBA789/rust-reversi" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/KOBA789/rust-reversi"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/KOBA789/rust-reversi'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8cb601080df78b26dc586f1645d4830f5cb663b3
[INFO] sha for GitHub repo KOBA789/rust-reversi: 8cb601080df78b26dc586f1645d4830f5cb663b3
[INFO] validating manifest of KOBA789/rust-reversi 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 KOBA789/rust-reversi 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 KOBA789/rust-reversi
[INFO] finished frobbing KOBA789/rust-reversi
[INFO] frobbed toml for KOBA789/rust-reversi written to work/ex/clippy-test-run/sources/stable/gh/KOBA789/rust-reversi/Cargo.toml
[INFO] started frobbing KOBA789/rust-reversi
[INFO] finished frobbing KOBA789/rust-reversi
[INFO] frobbed toml for KOBA789/rust-reversi written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/KOBA789/rust-reversi/Cargo.toml
[INFO] crate KOBA789/rust-reversi 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 KOBA789/rust-reversi against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-5/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/KOBA789/rust-reversi:/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" "-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] 93d70e19a00c88b462d7f98688c5ad7bee2c3b539aeaed138c39a4e3c3cdf0be
[INFO] running `"docker" "start" "-a" "93d70e19a00c88b462d7f98688c5ad7bee2c3b539aeaed138c39a4e3c3cdf0be"`
[INFO] [stderr]     Checking reversi v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `rhs`
[INFO] [stderr]   --> src/coord.rs:11:18
[INFO] [stderr]    |
[INFO] [stderr] 11 |     fn add(self, rhs: Self) -> Self::Output {
[INFO] [stderr]    |                  ^^^ help: consider using `_rhs` instead
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rhs`
[INFO] [stderr]   --> src/coord.rs:17:30
[INFO] [stderr]    |
[INFO] [stderr] 17 |     fn add_assign(&mut self, rhs: Self) {
[INFO] [stderr]    |                              ^^^ help: consider using `_rhs` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `index`
[INFO] [stderr]   --> src/board.rs:50:21
[INFO] [stderr]    |
[INFO] [stderr] 50 |     fn index(&self, index: Coord) -> &Self::Output {
[INFO] [stderr]    |                     ^^^^^ help: consider using `_index` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `index`
[INFO] [stderr]   --> src/board.rs:59:29
[INFO] [stderr]    |
[INFO] [stderr] 59 |     fn index_mut(&mut self, index: Coord) -> &mut Self::Output {
[INFO] [stderr]    |                             ^^^^^ help: consider using `_index` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `piece`
[INFO] [stderr]    --> src/board.rs:153:24
[INFO] [stderr]     |
[INFO] [stderr] 153 |     fn get_flip(&self, piece: Piece, mut pos: Coord, dir: Coord) -> u8 {
[INFO] [stderr]     |                        ^^^^^ help: consider using `_piece` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `pos`
[INFO] [stderr]    --> src/board.rs:153:42
[INFO] [stderr]     |
[INFO] [stderr] 153 |     fn get_flip(&self, piece: Piece, mut pos: Coord, dir: Coord) -> u8 {
[INFO] [stderr]     |                                          ^^^ help: consider using `_pos` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `dir`
[INFO] [stderr]    --> src/board.rs:153:54
[INFO] [stderr]     |
[INFO] [stderr] 153 |     fn get_flip(&self, piece: Piece, mut pos: Coord, dir: Coord) -> u8 {
[INFO] [stderr]     |                                                      ^^^ help: consider using `_dir` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `piece`
[INFO] [stderr]    --> src/board.rs:160:24
[INFO] [stderr]     |
[INFO] [stderr] 160 |     fn get_move(&self, piece: Piece, pos: Coord) -> Move {
[INFO] [stderr]     |                        ^^^^^ help: consider using `_piece` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `pos`
[INFO] [stderr]    --> src/board.rs:160:38
[INFO] [stderr]     |
[INFO] [stderr] 160 |     fn get_move(&self, piece: Piece, pos: Coord) -> Move {
[INFO] [stderr]     |                                      ^^^ help: consider using `_pos` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `piece`
[INFO] [stderr]    --> src/board.rs:167:25
[INFO] [stderr]     |
[INFO] [stderr] 167 |     pub fn moves(&self, piece: Piece) -> Moves {
[INFO] [stderr]     |                         ^^^^^ help: consider using `_piece` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `piece`
[INFO] [stderr]    --> src/board.rs:172:29
[INFO] [stderr]     |
[INFO] [stderr] 172 |     fn count_mut(&mut self, piece: Piece) -> &mut u8 {
[INFO] [stderr]     |                             ^^^^^ help: consider using `_piece` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `piece`
[INFO] [stderr]    --> src/board.rs:184:27
[INFO] [stderr]     |
[INFO] [stderr] 184 |     fn do_flip(&mut self, piece: Piece, mut pos: Coord, dir: Coord, flip: u8) {
[INFO] [stderr]     |                           ^^^^^ help: consider using `_piece` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `pos`
[INFO] [stderr]    --> src/board.rs:184:45
[INFO] [stderr]     |
[INFO] [stderr] 184 |     fn do_flip(&mut self, piece: Piece, mut pos: Coord, dir: Coord, flip: u8) {
[INFO] [stderr]     |                                             ^^^ help: consider using `_pos` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `dir`
[INFO] [stderr]    --> src/board.rs:184:57
[INFO] [stderr]     |
[INFO] [stderr] 184 |     fn do_flip(&mut self, piece: Piece, mut pos: Coord, dir: Coord, flip: u8) {
[INFO] [stderr]     |                                                         ^^^ help: consider using `_dir` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `flip`
[INFO] [stderr]    --> src/board.rs:184:69
[INFO] [stderr]     |
[INFO] [stderr] 184 |     fn do_flip(&mut self, piece: Piece, mut pos: Coord, dir: Coord, flip: u8) {
[INFO] [stderr]     |                                                                     ^^^^ help: consider using `_flip` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `piece`
[INFO] [stderr]    --> src/board.rs:189:31
[INFO] [stderr]     |
[INFO] [stderr] 189 |     pub fn do_move(&mut self, piece: Piece, mov: &Move) {
[INFO] [stderr]     |                               ^^^^^ help: consider using `_piece` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `mov`
[INFO] [stderr]    --> src/board.rs:189:45
[INFO] [stderr]     |
[INFO] [stderr] 189 |     pub fn do_move(&mut self, piece: Piece, mov: &Move) {
[INFO] [stderr]     |                                             ^^^ help: consider using `_mov` instead
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/board.rs:153:38
[INFO] [stderr]     |
[INFO] [stderr] 153 |     fn get_flip(&self, piece: Piece, mut pos: Coord, dir: Coord) -> u8 {
[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: variable does not need to be mutable
[INFO] [stderr]    --> src/board.rs:184:41
[INFO] [stderr]     |
[INFO] [stderr] 184 |     fn do_flip(&mut self, piece: Piece, mut pos: Coord, dir: Coord, flip: u8) {
[INFO] [stderr]     |                                         ----^^^
[INFO] [stderr]     |                                         |
[INFO] [stderr]     |                                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_in_range`
[INFO] [stderr]   --> src/board.rs:34:5
[INFO] [stderr]    |
[INFO] [stderr] 34 |     pub fn is_in_range(&self, pos: Coord) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `size`
[INFO] [stderr]   --> src/board.rs:40:5
[INFO] [stderr]    |
[INFO] [stderr] 40 |     pub fn size(&self) -> usize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `ZERO_FLIP`
[INFO] [stderr]   --> src/board.rs:85:1
[INFO] [stderr]    |
[INFO] [stderr] 85 | const ZERO_FLIP: [u8; 8] = [0, 0, 0, 0, 0, 0, 0, 0];
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_legal`
[INFO] [stderr]    --> src/board.rs:101:5
[INFO] [stderr]     |
[INFO] [stderr] 101 |     pub fn is_legal(&self) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `DIRECTIONS`
[INFO] [stderr]    --> src/board.rs:120:1
[INFO] [stderr]     |
[INFO] [stderr] 120 | / const DIRECTIONS: [Coord; 8] = [
[INFO] [stderr] 121 | |     Coord(-1, -1), //左上
[INFO] [stderr] 122 | |     Coord(0, -1),  //真上
[INFO] [stderr] 123 | |     Coord(1, -1),  //右上
[INFO] [stderr] ...   |
[INFO] [stderr] 128 | |     Coord(1, 1),   //右下
[INFO] [stderr] 129 | | ];
[INFO] [stderr]     | |__^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_flip`
[INFO] [stderr]    --> src/board.rs:153:5
[INFO] [stderr]     |
[INFO] [stderr] 153 |     fn get_flip(&self, piece: Piece, mut pos: Coord, dir: Coord) -> u8 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_move`
[INFO] [stderr]    --> src/board.rs:160:5
[INFO] [stderr]     |
[INFO] [stderr] 160 |     fn get_move(&self, piece: Piece, pos: Coord) -> Move {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `count_mut`
[INFO] [stderr]    --> src/board.rs:172:5
[INFO] [stderr]     |
[INFO] [stderr] 172 |     fn count_mut(&mut self, piece: Piece) -> &mut u8 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `do_flip`
[INFO] [stderr]    --> src/board.rs:184:5
[INFO] [stderr]     |
[INFO] [stderr] 184 |     fn do_flip(&mut self, piece: Piece, mut pos: Coord, dir: Coord, flip: u8) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `DumbPlayer`
[INFO] [stderr]  --> src/players/dumb.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub struct DumbPlayer;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/players/negamax.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     pub fn new(depth: usize) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]  --> src/piece.rs:9:21
[INFO] [stderr]   |
[INFO] [stderr] 9 |     pub fn opponent(&self) -> Piece {
[INFO] [stderr]   |                     ^^^^^ help: consider passing by value instead: `self`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::trivially_copy_pass_by_ref)] on by default
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/players/alphabeta.rs:26:12
[INFO] [stderr]    |
[INFO] [stderr] 26 |         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: length comparison to zero
[INFO] [stderr]   --> src/players/human.rs:10:12
[INFO] [stderr]    |
[INFO] [stderr] 10 |         if moves.len() == 0 {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `moves.is_empty()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rhs`
[INFO] [stderr]   --> src/coord.rs:11:18
[INFO] [stderr]    |
[INFO] [stderr] 11 |     fn add(self, rhs: Self) -> Self::Output {
[INFO] [stderr]    |                  ^^^ help: consider using `_rhs` instead
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rhs`
[INFO] [stderr]   --> src/coord.rs:17:30
[INFO] [stderr]    |
[INFO] [stderr] 17 |     fn add_assign(&mut self, rhs: Self) {
[INFO] [stderr]    |                              ^^^ help: consider using `_rhs` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `index`
[INFO] [stderr]   --> src/board.rs:50:21
[INFO] [stderr]    |
[INFO] [stderr] 50 |     fn index(&self, index: Coord) -> &Self::Output {
[INFO] [stderr]    |                     ^^^^^ help: consider using `_index` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `index`
[INFO] [stderr]   --> src/board.rs:59:29
[INFO] [stderr]    |
[INFO] [stderr] 59 |     fn index_mut(&mut self, index: Coord) -> &mut Self::Output {
[INFO] [stderr]    |                             ^^^^^ help: consider using `_index` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `piece`
[INFO] [stderr]    --> src/board.rs:153:24
[INFO] [stderr]     |
[INFO] [stderr] 153 |     fn get_flip(&self, piece: Piece, mut pos: Coord, dir: Coord) -> u8 {
[INFO] [stderr]     |                        ^^^^^ help: consider using `_piece` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `pos`
[INFO] [stderr]    --> src/board.rs:153:42
[INFO] [stderr]     |
[INFO] [stderr] 153 |     fn get_flip(&self, piece: Piece, mut pos: Coord, dir: Coord) -> u8 {
[INFO] [stderr]     |                                          ^^^ help: consider using `_pos` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `dir`
[INFO] [stderr]    --> src/board.rs:153:54
[INFO] [stderr]     |
[INFO] [stderr] 153 |     fn get_flip(&self, piece: Piece, mut pos: Coord, dir: Coord) -> u8 {
[INFO] [stderr]     |                                                      ^^^ help: consider using `_dir` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `piece`
[INFO] [stderr]    --> src/board.rs:160:24
[INFO] [stderr]     |
[INFO] [stderr] 160 |     fn get_move(&self, piece: Piece, pos: Coord) -> Move {
[INFO] [stderr]     |                        ^^^^^ help: consider using `_piece` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `pos`
[INFO] [stderr]    --> src/board.rs:160:38
[INFO] [stderr]     |
[INFO] [stderr] 160 |     fn get_move(&self, piece: Piece, pos: Coord) -> Move {
[INFO] [stderr]     |                                      ^^^ help: consider using `_pos` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `piece`
[INFO] [stderr]    --> src/board.rs:167:25
[INFO] [stderr]     |
[INFO] [stderr] 167 |     pub fn moves(&self, piece: Piece) -> Moves {
[INFO] [stderr]     |                         ^^^^^ help: consider using `_piece` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `piece`
[INFO] [stderr]    --> src/board.rs:172:29
[INFO] [stderr]     |
[INFO] [stderr] 172 |     fn count_mut(&mut self, piece: Piece) -> &mut u8 {
[INFO] [stderr]     |                             ^^^^^ help: consider using `_piece` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `piece`
[INFO] [stderr]    --> src/board.rs:184:27
[INFO] [stderr]     |
[INFO] [stderr] 184 |     fn do_flip(&mut self, piece: Piece, mut pos: Coord, dir: Coord, flip: u8) {
[INFO] [stderr]     |                           ^^^^^ help: consider using `_piece` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `pos`
[INFO] [stderr]    --> src/board.rs:184:45
[INFO] [stderr]     |
[INFO] [stderr] 184 |     fn do_flip(&mut self, piece: Piece, mut pos: Coord, dir: Coord, flip: u8) {
[INFO] [stderr]     |                                             ^^^ help: consider using `_pos` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `dir`
[INFO] [stderr]    --> src/board.rs:184:57
[INFO] [stderr]     |
[INFO] [stderr] 184 |     fn do_flip(&mut self, piece: Piece, mut pos: Coord, dir: Coord, flip: u8) {
[INFO] [stderr]     |                                                         ^^^ help: consider using `_dir` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `flip`
[INFO] [stderr]    --> src/board.rs:184:69
[INFO] [stderr]     |
[INFO] [stderr] 184 |     fn do_flip(&mut self, piece: Piece, mut pos: Coord, dir: Coord, flip: u8) {
[INFO] [stderr]     |                                                                     ^^^^ help: consider using `_flip` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `piece`
[INFO] [stderr]    --> src/board.rs:189:31
[INFO] [stderr]     |
[INFO] [stderr] 189 |     pub fn do_move(&mut self, piece: Piece, mov: &Move) {
[INFO] [stderr]     |                               ^^^^^ help: consider using `_piece` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `mov`
[INFO] [stderr]    --> src/board.rs:189:45
[INFO] [stderr]     |
[INFO] [stderr] 189 |     pub fn do_move(&mut self, piece: Piece, mov: &Move) {
[INFO] [stderr]     |                                             ^^^ help: consider using `_mov` instead
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/board.rs:153:38
[INFO] [stderr]     |
[INFO] [stderr] 153 |     fn get_flip(&self, piece: Piece, mut pos: Coord, dir: Coord) -> u8 {
[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: variable does not need to be mutable
[INFO] [stderr]    --> src/board.rs:184:41
[INFO] [stderr]     |
[INFO] [stderr] 184 |     fn do_flip(&mut self, piece: Piece, mut pos: Coord, dir: Coord, flip: u8) {
[INFO] [stderr]     |                                         ----^^^
[INFO] [stderr]     |                                         |
[INFO] [stderr]     |                                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `DIRECTIONS`
[INFO] [stderr]    --> src/board.rs:120:1
[INFO] [stderr]     |
[INFO] [stderr] 120 | / const DIRECTIONS: [Coord; 8] = [
[INFO] [stderr] 121 | |     Coord(-1, -1), //左上
[INFO] [stderr] 122 | |     Coord(0, -1),  //真上
[INFO] [stderr] 123 | |     Coord(1, -1),  //右上
[INFO] [stderr] ...   |
[INFO] [stderr] 128 | |     Coord(1, 1),   //右下
[INFO] [stderr] 129 | | ];
[INFO] [stderr]     | |__^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `DumbPlayer`
[INFO] [stderr]  --> src/players/dumb.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub struct DumbPlayer;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/players/negamax.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     pub fn new(depth: usize) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]  --> src/piece.rs:9:21
[INFO] [stderr]   |
[INFO] [stderr] 9 |     pub fn opponent(&self) -> Piece {
[INFO] [stderr]   |                     ^^^^^ help: consider passing by value instead: `self`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::trivially_copy_pass_by_ref)] on by default
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/players/alphabeta.rs:26:12
[INFO] [stderr]    |
[INFO] [stderr] 26 |         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: length comparison to zero
[INFO] [stderr]   --> src/players/human.rs:10:12
[INFO] [stderr]    |
[INFO] [stderr] 10 |         if moves.len() == 0 {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `moves.is_empty()`
[INFO] [stderr]    |
[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 2.22s
[INFO] running `"docker" "inspect" "93d70e19a00c88b462d7f98688c5ad7bee2c3b539aeaed138c39a4e3c3cdf0be"`
[INFO] running `"docker" "rm" "-f" "93d70e19a00c88b462d7f98688c5ad7bee2c3b539aeaed138c39a4e3c3cdf0be"`
[INFO] [stdout] 93d70e19a00c88b462d7f98688c5ad7bee2c3b539aeaed138c39a4e3c3cdf0be