[INFO] cloning repository https://github.com/sadilekivan/sudoku-solver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sadilekivan/sudoku-solver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsadilekivan%2Fsudoku-solver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsadilekivan%2Fsudoku-solver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 164b6003bca0d74c2c6882af3f5e5948fc5011f2
[INFO] linting sadilekivan/sudoku-solver against nightly for clippy-nonminimal_bool-denied
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsadilekivan%2Fsudoku-solver" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/sadilekivan/sudoku-solver
[INFO] finished tweaking git repo https://github.com/sadilekivan/sudoku-solver
[INFO] tweaked toml for git repo https://github.com/sadilekivan/sudoku-solver written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/sadilekivan/sudoku-solver on toolchain nightly
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/sadilekivan/sudoku-solver 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" "+nightly" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 326b99a0097a6682a1ac08fa499a2560ba5dcae211c7e4e2ccd6299743a31c16
[INFO] running `Command { std: "docker" "start" "-a" "326b99a0097a6682a1ac08fa499a2560ba5dcae211c7e4e2ccd6299743a31c16", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "326b99a0097a6682a1ac08fa499a2560ba5dcae211c7e4e2ccd6299743a31c16", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "326b99a0097a6682a1ac08fa499a2560ba5dcae211c7e4e2ccd6299743a31c16", kill_on_drop: false }`
[INFO] [stdout] 326b99a0097a6682a1ac08fa499a2560ba5dcae211c7e4e2ccd6299743a31c16
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "clippy" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ae10048f79b451fcca05e1a6f6a08a0c6fc648d073203709679bbba76f05ef11
[INFO] running `Command { std: "docker" "start" "-a" "ae10048f79b451fcca05e1a6f6a08a0c6fc648d073203709679bbba76f05ef11", kill_on_drop: false }`
[INFO] [stderr]     Checking sudoku-solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `Lrtb` is never constructed
[INFO] [stdout]   --> src/strategy/lrtb.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct Lrtb;
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_valid` is never used
[INFO] [stdout]   --> src/strategy/lrtb.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn is_valid(board: &mut impl SudokuBoard, row: usize, col: usize, n: u32) -> bool {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `solve_step` is never used
[INFO] [stdout]   --> src/strategy/lrtb.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | impl Lrtb {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 48 |     fn solve_step(board: &mut impl SudokuBoard, row: usize, col: usize) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Lap` is never constructed
[INFO] [stdout]  --> src/strategy/lap.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct Lap;
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_valid_numbers` is never used
[INFO] [stdout]  --> src/strategy/lap.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn get_valid_numbers(board: &mut impl SudokuBoard, p: Point) -> Vec<u32> {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LowestValid` is never constructed
[INFO] [stdout]   --> src/strategy/lap.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 31 | struct LowestValid {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/strategy/lap.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 36 | impl LowestValid {
[INFO] [stdout]    | ---------------- associated function in this implementation
[INFO] [stdout] 37 |     fn new(p: Point, valid_moves: Vec<u32>) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_lowest_valid` is never used
[INFO] [stdout]   --> src/strategy/lap.rs:43:4
[INFO] [stdout]    |
[INFO] [stdout] 43 | fn first_lowest_valid(board: &mut impl SudokuBoard) -> Option<LowestValid> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: empty string literal in `println!`
[INFO] [stdout]   --> src/board.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |         println!("");
[INFO] [stdout]    |         ^^^^^^^^^--^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  help: remove the empty string
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stdout]    = note: `#[warn(clippy::println_empty_string)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `solve_step` is never used
[INFO] [stdout]   --> src/strategy/lap.rs:65:8
[INFO] [stdout]    |
[INFO] [stdout] 64 | impl Lap {
[INFO] [stdout]    | -------- associated function in this implementation
[INFO] [stdout] 65 |     fn solve_step(board: &mut impl SudokuBoard) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LapMc` is never constructed
[INFO] [stdout]  --> src/strategy/lapmc.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct LapMc;
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_valid_numbers` is never used
[INFO] [stdout]   --> src/strategy/lapmc.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn get_valid_numbers(board: &mut impl SudokuBoard, p: Point) -> Vec<u32> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LowestValid` is never constructed
[INFO] [stdout]   --> src/strategy/lapmc.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct LowestValid {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/strategy/lapmc.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | impl LowestValid {
[INFO] [stdout]    | ---------------- associated function in this implementation
[INFO] [stdout] 39 |     fn new(p: Point, valid_moves: Vec<u32>) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lrtb.rs:41:5
[INFO] [stdout]    |
[INFO] [stdout] 41 |     return true;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout]    = note: `#[warn(clippy::needless_return)]` on by default
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 41 -     return true;
[INFO] [stdout] 41 +     true
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_lowest_valid` is never used
[INFO] [stdout]   --> src/strategy/lapmc.rs:45:4
[INFO] [stdout]    |
[INFO] [stdout] 45 | fn first_lowest_valid(board: &mut impl SudokuBoard) -> Option<LowestValid> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `solve_step` is never used
[INFO] [stdout]   --> src/strategy/lapmc.rs:67:8
[INFO] [stdout]    |
[INFO] [stdout] 66 | impl LapMc {
[INFO] [stdout]    | ---------- associated function in this implementation
[INFO] [stdout] 67 |     fn solve_step(board: &mut impl SudokuBoard) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lrtb.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |             return true;
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 52 -             return true;
[INFO] [stdout] 52 +             true
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lrtb.rs:55:13
[INFO] [stdout]    |
[INFO] [stdout] 55 |             return Self::solve_step(board, row + 1, 0);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 55 -             return Self::solve_step(board, row + 1, 0);
[INFO] [stdout] 55 +             Self::solve_step(board, row + 1, 0)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lrtb.rs:58:13
[INFO] [stdout]    |
[INFO] [stdout] 58 |             return Self::solve_step(board, row, col + 1);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 58 -             return Self::solve_step(board, row, col + 1);
[INFO] [stdout] 58 +             Self::solve_step(board, row, col + 1)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lrtb.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 76 |             return false;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 76 -             return false;
[INFO] [stdout] 76 +             false
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lrtb.rs:84:13
[INFO] [stdout]    |
[INFO] [stdout] 84 |             return Some(board)
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 84 -             return Some(board)
[INFO] [stdout] 84 +             Some(board)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lrtb.rs:86:13
[INFO] [stdout]    |
[INFO] [stdout] 86 |             return None
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 86 -             return None
[INFO] [stdout] 86 +             None
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/strategy/lap.rs:23:39
[INFO] [stdout]    |
[INFO] [stdout] 23 |             valid_number_v.retain(|n| !(*n == board.read(p)));
[INFO] [stdout]    |                                       ^^^^^^^^^^^^^^^^^^^^^^ help: try: `(*n != board.read(p))`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout]    = note: `#[warn(clippy::nonminimal_bool)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this `.filter_map(..)` can be written more simply using `.filter(..)`
[INFO] [stdout]   --> src/strategy/lap.rs:44:49
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let v: Vec<LowestValid> = board.into_iter().filter_map(|f| if f.1 == 0 {Some(f)} else {None} ).map(|(p, _)| 
[INFO] [stdout]    |                                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_filter_map
[INFO] [stdout]    = note: `#[warn(clippy::unnecessary_filter_map)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lap.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |             return false;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 77 -             return false;
[INFO] [stdout] 77 +             false
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lap.rs:79:13
[INFO] [stdout]    |
[INFO] [stdout] 79 |             return true;
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 79 -             return true;
[INFO] [stdout] 79 +             true
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lap.rs:87:13
[INFO] [stdout]    |
[INFO] [stdout] 87 |             return Some(board)
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 87 -             return Some(board)
[INFO] [stdout] 87 +             Some(board)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lap.rs:89:13
[INFO] [stdout]    |
[INFO] [stdout] 89 |             return None
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 89 -             return None
[INFO] [stdout] 89 +             None
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/strategy/lapmc.rs:25:39
[INFO] [stdout]    |
[INFO] [stdout] 25 |             valid_number_v.retain(|n| !(*n == board.read(p)));
[INFO] [stdout]    |                                       ^^^^^^^^^^^^^^^^^^^^^^ help: try: `(*n != board.read(p))`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this `.filter_map(..)` can be written more simply using `.filter(..)`
[INFO] [stdout]   --> src/strategy/lapmc.rs:46:49
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let v: Vec<LowestValid> = board.into_iter().filter_map(|f| if f.1 == 0 {Some(f)} else {None} ).map(|(p, _)| 
[INFO] [stdout]    |                                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_filter_map
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lapmc.rs:79:13
[INFO] [stdout]    |
[INFO] [stdout] 79 |             return false;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 79 -             return false;
[INFO] [stdout] 79 +             false
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lapmc.rs:81:13
[INFO] [stdout]    |
[INFO] [stdout] 81 |             return true;
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 81 -             return true;
[INFO] [stdout] 81 +             true
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lapmc.rs:89:13
[INFO] [stdout]    |
[INFO] [stdout] 89 |             return Some(board)
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 89 -             return Some(board)
[INFO] [stdout] 89 +             Some(board)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lapmc.rs:91:13
[INFO] [stdout]    |
[INFO] [stdout] 91 |             return None
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 91 -             return None
[INFO] [stdout] 91 +             None
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: empty string literal in `println!`
[INFO] [stdout]   --> src/board.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |         println!("");
[INFO] [stdout]    |         ^^^^^^^^^--^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  help: remove the empty string
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stdout]    = note: `#[warn(clippy::println_empty_string)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lrtb.rs:41:5
[INFO] [stdout]    |
[INFO] [stdout] 41 |     return true;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout]    = note: `#[warn(clippy::needless_return)]` on by default
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 41 -     return true;
[INFO] [stdout] 41 +     true
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lrtb.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |             return true;
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 52 -             return true;
[INFO] [stdout] 52 +             true
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lrtb.rs:55:13
[INFO] [stdout]    |
[INFO] [stdout] 55 |             return Self::solve_step(board, row + 1, 0);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 55 -             return Self::solve_step(board, row + 1, 0);
[INFO] [stdout] 55 +             Self::solve_step(board, row + 1, 0)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lrtb.rs:58:13
[INFO] [stdout]    |
[INFO] [stdout] 58 |             return Self::solve_step(board, row, col + 1);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 58 -             return Self::solve_step(board, row, col + 1);
[INFO] [stdout] 58 +             Self::solve_step(board, row, col + 1)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lrtb.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 76 |             return false;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 76 -             return false;
[INFO] [stdout] 76 +             false
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lrtb.rs:84:13
[INFO] [stdout]    |
[INFO] [stdout] 84 |             return Some(board)
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 84 -             return Some(board)
[INFO] [stdout] 84 +             Some(board)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lrtb.rs:86:13
[INFO] [stdout]    |
[INFO] [stdout] 86 |             return None
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 86 -             return None
[INFO] [stdout] 86 +             None
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/strategy/lap.rs:23:39
[INFO] [stdout]    |
[INFO] [stdout] 23 |             valid_number_v.retain(|n| !(*n == board.read(p)));
[INFO] [stdout]    |                                       ^^^^^^^^^^^^^^^^^^^^^^ help: try: `(*n != board.read(p))`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout]    = note: `#[warn(clippy::nonminimal_bool)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this `.filter_map(..)` can be written more simply using `.filter(..)`
[INFO] [stdout]   --> src/strategy/lap.rs:44:49
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let v: Vec<LowestValid> = board.into_iter().filter_map(|f| if f.1 == 0 {Some(f)} else {None} ).map(|(p, _)| 
[INFO] [stdout]    |                                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_filter_map
[INFO] [stdout]    = note: `#[warn(clippy::unnecessary_filter_map)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lap.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |             return false;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 77 -             return false;
[INFO] [stdout] 77 +             false
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lap.rs:79:13
[INFO] [stdout]    |
[INFO] [stdout] 79 |             return true;
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 79 -             return true;
[INFO] [stdout] 79 +             true
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lap.rs:87:13
[INFO] [stdout]    |
[INFO] [stdout] 87 |             return Some(board)
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 87 -             return Some(board)
[INFO] [stdout] 87 +             Some(board)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lap.rs:89:13
[INFO] [stdout]    |
[INFO] [stdout] 89 |             return None
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 89 -             return None
[INFO] [stdout] 89 +             None
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/strategy/lapmc.rs:25:39
[INFO] [stdout]    |
[INFO] [stdout] 25 |             valid_number_v.retain(|n| !(*n == board.read(p)));
[INFO] [stdout]    |                                       ^^^^^^^^^^^^^^^^^^^^^^ help: try: `(*n != board.read(p))`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this `.filter_map(..)` can be written more simply using `.filter(..)`
[INFO] [stdout]   --> src/strategy/lapmc.rs:46:49
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let v: Vec<LowestValid> = board.into_iter().filter_map(|f| if f.1 == 0 {Some(f)} else {None} ).map(|(p, _)| 
[INFO] [stdout]    |                                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_filter_map
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lapmc.rs:79:13
[INFO] [stdout]    |
[INFO] [stdout] 79 |             return false;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 79 -             return false;
[INFO] [stdout] 79 +             false
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lapmc.rs:81:13
[INFO] [stdout]    |
[INFO] [stdout] 81 |             return true;
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 81 -             return true;
[INFO] [stdout] 81 +             true
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lapmc.rs:89:13
[INFO] [stdout]    |
[INFO] [stdout] 89 |             return Some(board)
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 89 -             return Some(board)
[INFO] [stdout] 89 +             Some(board)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/strategy/lapmc.rs:91:13
[INFO] [stdout]    |
[INFO] [stdout] 91 |             return None
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 91 -             return None
[INFO] [stdout] 91 +             None
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.46s
[INFO] running `Command { std: "docker" "inspect" "ae10048f79b451fcca05e1a6f6a08a0c6fc648d073203709679bbba76f05ef11", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ae10048f79b451fcca05e1a6f6a08a0c6fc648d073203709679bbba76f05ef11", kill_on_drop: false }`
[INFO] [stdout] ae10048f79b451fcca05e1a6f6a08a0c6fc648d073203709679bbba76f05ef11