[INFO] updating cached repository DenSev/rust-chess
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/DenSev/rust-chess
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/DenSev/rust-chess" "work/ex/clippy-test-run/sources/stable/gh/DenSev/rust-chess"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/DenSev/rust-chess'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/DenSev/rust-chess" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/DenSev/rust-chess"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/DenSev/rust-chess'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4a3b7afe8b86d7e15b60e7afe7a3179ce93ce29d
[INFO] sha for GitHub repo DenSev/rust-chess: 4a3b7afe8b86d7e15b60e7afe7a3179ce93ce29d
[INFO] validating manifest of DenSev/rust-chess 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 DenSev/rust-chess 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 DenSev/rust-chess
[INFO] finished frobbing DenSev/rust-chess
[INFO] frobbed toml for DenSev/rust-chess written to work/ex/clippy-test-run/sources/stable/gh/DenSev/rust-chess/Cargo.toml
[INFO] started frobbing DenSev/rust-chess
[INFO] finished frobbing DenSev/rust-chess
[INFO] frobbed toml for DenSev/rust-chess written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/DenSev/rust-chess/Cargo.toml
[INFO] crate DenSev/rust-chess 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 DenSev/rust-chess 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-6/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/DenSev/rust-chess:/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] b0df5385da0809b288b125fd8c3b996540dd2c35304b0f3aa5b3ef9be4d2b8b1
[INFO] running `"docker" "start" "-a" "b0df5385da0809b288b125fd8c3b996540dd2c35304b0f3aa5b3ef9be4d2b8b1"`
[INFO] [stderr]     Checking rust-chess v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |         return Cell::None;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Cell::None`
[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] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |         return Cell::Some(piece);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Cell::Some(piece)`
[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/lib.rs:22:9
[INFO] [stderr]    |
[INFO] [stderr] 22 | /         return match &self {
[INFO] [stderr] 23 | |             Cell::None => false,
[INFO] [stderr] 24 | |             Cell::Some(_) => true
[INFO] [stderr] 25 | |         };
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[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] 22 |         match &self {
[INFO] [stderr] 23 |             Cell::None => false,
[INFO] [stderr] 24 |             Cell::Some(_) => true
[INFO] [stderr] 25 |         }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:29:9
[INFO] [stderr]    |
[INFO] [stderr] 29 | /         return match &self {
[INFO] [stderr] 30 | |             Cell::None => true,
[INFO] [stderr] 31 | |             Cell::Some(_) => false
[INFO] [stderr] 32 | |         };
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[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] 29 |         match &self {
[INFO] [stderr] 30 |             Cell::None => true,
[INFO] [stderr] 31 |             Cell::Some(_) => false
[INFO] [stderr] 32 |         }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:36:9
[INFO] [stderr]    |
[INFO] [stderr] 36 | /         return match &self {
[INFO] [stderr] 37 | |             Cell::None => " ",
[INFO] [stderr] 38 | |             Cell::Some(piece) => &piece.representation
[INFO] [stderr] 39 | |         };
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[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] 36 |         match &self {
[INFO] [stderr] 37 |             Cell::None => " ",
[INFO] [stderr] 38 |             Cell::Some(piece) => &piece.representation
[INFO] [stderr] 39 |         }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 | /         return match &self {
[INFO] [stderr] 44 | |             Cell::None => None,
[INFO] [stderr] 45 | |             Cell::Some(piece) => Some(&piece.color)
[INFO] [stderr] 46 | |         };
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[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] 43 |         match &self {
[INFO] [stderr] 44 |             Cell::None => None,
[INFO] [stderr] 45 |             Cell::Some(piece) => Some(&piece.color)
[INFO] [stderr] 46 |         }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:50:9
[INFO] [stderr]    |
[INFO] [stderr] 50 | /         return match &self {
[INFO] [stderr] 51 | |             Cell::None => None,
[INFO] [stderr] 52 | |             Cell::Some(piece) => Some(&piece)
[INFO] [stderr] 53 | |         };
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[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] 50 |         match &self {
[INFO] [stderr] 51 |             Cell::None => None,
[INFO] [stderr] 52 |             Cell::Some(piece) => Some(&piece)
[INFO] [stderr] 53 |         }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:57:9
[INFO] [stderr]    |
[INFO] [stderr] 57 | /         return match &self {
[INFO] [stderr] 58 | |             Cell::None => None,
[INFO] [stderr] 59 | |             Cell::Some(piece) => Some(&piece.piece_kind)
[INFO] [stderr] 60 | |         };
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[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] 57 |         match &self {
[INFO] [stderr] 58 |             Cell::None => None,
[INFO] [stderr] 59 |             Cell::Some(piece) => Some(&piece.piece_kind)
[INFO] [stderr] 60 |         }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:65:9
[INFO] [stderr]    |
[INFO] [stderr] 65 | /         return match &self {
[INFO] [stderr] 66 | |             Cell::None => false,
[INFO] [stderr] 67 | |             Cell::Some(piece) => piece.color.ne(&cell.get_color().unwrap())
[INFO] [stderr] 68 | |         };
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[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] 65 |         match &self {
[INFO] [stderr] 66 |             Cell::None => false,
[INFO] [stderr] 67 |             Cell::Some(piece) => piece.color.ne(&cell.get_color().unwrap())
[INFO] [stderr] 68 |         }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:72:9
[INFO] [stderr]    |
[INFO] [stderr] 72 | /         return match &self {
[INFO] [stderr] 73 | |             Cell::None => true,
[INFO] [stderr] 74 | |             Cell::Some(piece) => piece.color.eq(&cell.get_color().unwrap())
[INFO] [stderr] 75 | |         };
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[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] 72 |         match &self {
[INFO] [stderr] 73 |             Cell::None => true,
[INFO] [stderr] 74 |             Cell::Some(piece) => piece.color.eq(&cell.get_color().unwrap())
[INFO] [stderr] 75 |         }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/lib.rs:225:9
[INFO] [stderr]     |
[INFO] [stderr] 225 |         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: unneeded return statement
[INFO] [stderr]    --> src/lib.rs:244:9
[INFO] [stderr]     |
[INFO] [stderr] 244 |         return &self.cells[y][x];
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `&self.cells[y][x]`
[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/lib.rs:259:9
[INFO] [stderr]     |
[INFO] [stderr] 259 |         return pieces;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^ help: remove `return` as shown: `pieces`
[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/lib.rs:272:9
[INFO] [stderr]     |
[INFO] [stderr] 272 |         return None;
[INFO] [stderr]     |         ^^^^^^^^^^^^ help: remove `return` as shown: `None`
[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/lib.rs:283:9
[INFO] [stderr]     |
[INFO] [stderr] 283 |         return false;
[INFO] [stderr]     |         ^^^^^^^^^^^^^ help: remove `return` as shown: `false`
[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] error[E0277]: the trait bound `Pos: std::hash::Hash` is not satisfied
[INFO] [stderr]    --> src/lib.rs:248:47
[INFO] [stderr]     |
[INFO] [stderr] 248 |         let mut pieces: HashMap<Pos, &Cell> = HashMap::new();
[INFO] [stderr]     |                                               ^^^^^^^^^^^^ the trait `std::hash::Hash` is not implemented for `Pos`
[INFO] [stderr]     |
[INFO] [stderr]     = note: required by `<std::collections::HashMap<K, V>>::new`
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |         return Cell::None;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Cell::None`
[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] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |         return Cell::Some(piece);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Cell::Some(piece)`
[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/lib.rs:22:9
[INFO] [stderr]    |
[INFO] [stderr] 22 | /         return match &self {
[INFO] [stderr] 23 | |             Cell::None => false,
[INFO] [stderr] 24 | |             Cell::Some(_) => true
[INFO] [stderr] 25 | |         };
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[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] 22 |         match &self {
[INFO] [stderr] 23 |             Cell::None => false,
[INFO] [stderr] 24 |             Cell::Some(_) => true
[INFO] [stderr] 25 |         }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:29:9
[INFO] [stderr]    |
[INFO] [stderr] 29 | /         return match &self {
[INFO] [stderr] 30 | |             Cell::None => true,
[INFO] [stderr] 31 | |             Cell::Some(_) => false
[INFO] [stderr] 32 | |         };
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[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] 29 |         match &self {
[INFO] [stderr] 30 |             Cell::None => true,
[INFO] [stderr] 31 |             Cell::Some(_) => false
[INFO] [stderr] 32 |         }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:36:9
[INFO] [stderr]    |
[INFO] [stderr] 36 | /         return match &self {
[INFO] [stderr] 37 | |             Cell::None => " ",
[INFO] [stderr] 38 | |             Cell::Some(piece) => &piece.representation
[INFO] [stderr] 39 | |         };
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[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] 36 |         match &self {
[INFO] [stderr] 37 |             Cell::None => " ",
[INFO] [stderr] 38 |             Cell::Some(piece) => &piece.representation
[INFO] [stderr] 39 |         }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 | /         return match &self {
[INFO] [stderr] 44 | |             Cell::None => None,
[INFO] [stderr] 45 | |             Cell::Some(piece) => Some(&piece.color)
[INFO] [stderr] 46 | |         };
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[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] 43 |         match &self {
[INFO] [stderr] 44 |             Cell::None => None,
[INFO] [stderr] 45 |             Cell::Some(piece) => Some(&piece.color)
[INFO] [stderr] 46 |         }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:50:9
[INFO] [stderr]    |
[INFO] [stderr] 50 | /         return match &self {
[INFO] [stderr] 51 | |             Cell::None => None,
[INFO] [stderr] 52 | |             Cell::Some(piece) => Some(&piece)
[INFO] [stderr] 53 | |         };
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[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] 50 |         match &self {
[INFO] [stderr] 51 |             Cell::None => None,
[INFO] [stderr] 52 |             Cell::Some(piece) => Some(&piece)
[INFO] [stderr] 53 |         }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:57:9
[INFO] [stderr]    |
[INFO] [stderr] 57 | /         return match &self {
[INFO] [stderr] 58 | |             Cell::None => None,
[INFO] [stderr] 59 | |             Cell::Some(piece) => Some(&piece.piece_kind)
[INFO] [stderr] 60 | |         };
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[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] 57 |         match &self {
[INFO] [stderr] 58 |             Cell::None => None,
[INFO] [stderr] 59 |             Cell::Some(piece) => Some(&piece.piece_kind)
[INFO] [stderr] 60 |         }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:65:9
[INFO] [stderr]    |
[INFO] [stderr] 65 | /         return match &self {
[INFO] [stderr] 66 | |             Cell::None => false,
[INFO] [stderr] 67 | |             Cell::Some(piece) => piece.color.ne(&cell.get_color().unwrap())
[INFO] [stderr] 68 | |         };
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[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] 65 |         match &self {
[INFO] [stderr] 66 |             Cell::None => false,
[INFO] [stderr] 67 |             Cell::Some(piece) => piece.color.ne(&cell.get_color().unwrap())
[INFO] [stderr] 68 |         }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:72:9
[INFO] [stderr]    |
[INFO] [stderr] 72 | /         return match &self {
[INFO] [stderr] 73 | |             Cell::None => true,
[INFO] [stderr] 74 | |             Cell::Some(piece) => piece.color.eq(&cell.get_color().unwrap())
[INFO] [stderr] 75 | |         };
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[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] 72 |         match &self {
[INFO] [stderr] 73 |             Cell::None => true,
[INFO] [stderr] 74 |             Cell::Some(piece) => piece.color.eq(&cell.get_color().unwrap())
[INFO] [stderr] 75 |         }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/lib.rs:225:9
[INFO] [stderr]     |
[INFO] [stderr] 225 |         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: unneeded return statement
[INFO] [stderr]    --> src/lib.rs:244:9
[INFO] [stderr]     |
[INFO] [stderr] 244 |         return &self.cells[y][x];
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `&self.cells[y][x]`
[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/lib.rs:259:9
[INFO] [stderr]     |
[INFO] [stderr] 259 |         return pieces;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^ help: remove `return` as shown: `pieces`
[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/lib.rs:272:9
[INFO] [stderr]     |
[INFO] [stderr] 272 |         return None;
[INFO] [stderr]     |         ^^^^^^^^^^^^ help: remove `return` as shown: `None`
[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/lib.rs:283:9
[INFO] [stderr]     |
[INFO] [stderr] 283 |         return false;
[INFO] [stderr]     |         ^^^^^^^^^^^^^ help: remove `return` as shown: `false`
[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] error[E0599]: no method named `insert` found for type `std::collections::HashMap<Pos, &Cell>` in the current scope
[INFO] [stderr]    --> src/lib.rs:255:28
[INFO] [stderr]     |
[INFO] [stderr] 255 |                     pieces.insert(Pos { x: j, y: i }, cell_at);
[INFO] [stderr]     |                            ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: the method `insert` exists but the following trait bounds were not satisfied:
[INFO] [stderr]             `Pos : std::hash::Hash`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `iter` found for type `std::collections::HashMap<Pos, &Cell>` in the current scope
[INFO] [stderr]    --> src/lib.rs:276:36
[INFO] [stderr]     |
[INFO] [stderr] 276 |         for (pos, piece) in pieces.iter() {
[INFO] [stderr]     |                                    ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: the method `iter` exists but the following trait bounds were not satisfied:
[INFO] [stderr]             `Pos : std::hash::Hash`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/lib.rs:279:35
[INFO] [stderr]     |
[INFO] [stderr] 279 |             if positions.contains(opposing_king_pos) {
[INFO] [stderr]     |                                   ^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |                                   |
[INFO] [stderr]     |                                   expected reference, found struct `Pos`
[INFO] [stderr]     |                                   help: consider borrowing here: `&opposing_king_pos`
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&_`
[INFO] [stderr]                found type `Pos`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/lib.rs:298:48
[INFO] [stderr]     |
[INFO] [stderr] 298 |       pub fn check_board(&self) -> Option<Color> {
[INFO] [stderr]     |  ________________________________________________^
[INFO] [stderr] 299 | |         let white_pieces = self.get_cells_of_color(Color::White);
[INFO] [stderr] 300 | |         let black_king = self.get_pos_of_piece(PieceKind::King, Color::Black);
[INFO] [stderr] 301 | |         let black_king_checked = self.check_for_pieces(white_pieces, black_king.unwrap());
[INFO] [stderr] ...   |
[INFO] [stderr] 323 | |     }*/
[INFO] [stderr] 324 | |     }
[INFO] [stderr]     | |_____^ expected enum `std::option::Option`, found ()
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `std::option::Option<Color>`
[INFO] [stderr]                found type `()`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 5 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors occurred: E0277, E0308, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0277`.
[INFO] [stderr] error: Could not compile `rust-chess`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0277]: the trait bound `Pos: std::hash::Hash` is not satisfied
[INFO] [stderr]    --> src/lib.rs:248:47
[INFO] [stderr]     |
[INFO] [stderr] 248 |         let mut pieces: HashMap<Pos, &Cell> = HashMap::new();
[INFO] [stderr]     |                                               ^^^^^^^^^^^^ the trait `std::hash::Hash` is not implemented for `Pos`
[INFO] [stderr]     |
[INFO] [stderr]     = note: required by `<std::collections::HashMap<K, V>>::new`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `insert` found for type `std::collections::HashMap<Pos, &Cell>` in the current scope
[INFO] [stderr]    --> src/lib.rs:255:28
[INFO] [stderr]     |
[INFO] [stderr] 255 |                     pieces.insert(Pos { x: j, y: i }, cell_at);
[INFO] [stderr]     |                            ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: the method `insert` exists but the following trait bounds were not satisfied:
[INFO] [stderr]             `Pos : std::hash::Hash`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `iter` found for type `std::collections::HashMap<Pos, &Cell>` in the current scope
[INFO] [stderr]    --> src/lib.rs:276:36
[INFO] [stderr]     |
[INFO] [stderr] 276 |         for (pos, piece) in pieces.iter() {
[INFO] [stderr]     |                                    ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: the method `iter` exists but the following trait bounds were not satisfied:
[INFO] [stderr]             `Pos : std::hash::Hash`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/lib.rs:279:35
[INFO] [stderr]     |
[INFO] [stderr] 279 |             if positions.contains(opposing_king_pos) {
[INFO] [stderr]     |                                   ^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |                                   |
[INFO] [stderr]     |                                   expected reference, found struct `Pos`
[INFO] [stderr]     |                                   help: consider borrowing here: `&opposing_king_pos`
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `&_`
[INFO] [stderr]                found type `Pos`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/lib.rs:298:48
[INFO] [stderr]     |
[INFO] [stderr] 298 |       pub fn check_board(&self) -> Option<Color> {
[INFO] [stderr]     |  ________________________________________________^
[INFO] [stderr] 299 | |         let white_pieces = self.get_cells_of_color(Color::White);
[INFO] [stderr] 300 | |         let black_king = self.get_pos_of_piece(PieceKind::King, Color::Black);
[INFO] [stderr] 301 | |         let black_king_checked = self.check_for_pieces(white_pieces, black_king.unwrap());
[INFO] [stderr] ...   |
[INFO] [stderr] 323 | |     }*/
[INFO] [stderr] 324 | |     }
[INFO] [stderr]     | |_____^ expected enum `std::option::Option`, found ()
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `std::option::Option<Color>`
[INFO] [stderr]                found type `()`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 5 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors occurred: E0277, E0308, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0277`.
[INFO] [stderr] error: Could not compile `rust-chess`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b0df5385da0809b288b125fd8c3b996540dd2c35304b0f3aa5b3ef9be4d2b8b1"`
[INFO] running `"docker" "rm" "-f" "b0df5385da0809b288b125fd8c3b996540dd2c35304b0f3aa5b3ef9be4d2b8b1"`
[INFO] [stdout] b0df5385da0809b288b125fd8c3b996540dd2c35304b0f3aa5b3ef9be4d2b8b1