[INFO] cloning repository https://github.com/feadoor/sudoku-utils
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/feadoor/sudoku-utils" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffeadoor%2Fsudoku-utils", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffeadoor%2Fsudoku-utils'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 85a7d5da72ed81e6a32f1a6c4f27cdb178bdf314
[INFO] checking feadoor/sudoku-utils against try#0c70cfbec949d241375e31c5a42066be70c720fc for pr-149681
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffeadoor%2Fsudoku-utils" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/feadoor/sudoku-utils
[INFO] finished tweaking git repo https://github.com/feadoor/sudoku-utils
[INFO] tweaked toml for git repo https://github.com/feadoor/sudoku-utils written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/feadoor/sudoku-utils on toolchain 0c70cfbec949d241375e31c5a42066be70c720fc
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0c70cfbec949d241375e31c5a42066be70c720fc" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/feadoor/sudoku-utils 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" "+0c70cfbec949d241375e31c5a42066be70c720fc" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking feadoor/sudoku-utils against try#0c70cfbec949d241375e31c5a42066be70c720fc for pr-149681
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffeadoor%2Fsudoku-utils" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/feadoor/sudoku-utils
[INFO] finished tweaking git repo https://github.com/feadoor/sudoku-utils
[INFO] tweaked toml for git repo https://github.com/feadoor/sudoku-utils written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/feadoor/sudoku-utils on toolchain 0c70cfbec949d241375e31c5a42066be70c720fc
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0c70cfbec949d241375e31c5a42066be70c720fc" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/feadoor/sudoku-utils 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" "+0c70cfbec949d241375e31c5a42066be70c720fc" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded itertools v0.14.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+0c70cfbec949d241375e31c5a42066be70c720fc" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3d9d3cae48086b71f7eef205bb22871b88db17385a65d5172006420b46f5df4d
[INFO] running `Command { std: "docker" "start" "-a" "3d9d3cae48086b71f7eef205bb22871b88db17385a65d5172006420b46f5df4d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3d9d3cae48086b71f7eef205bb22871b88db17385a65d5172006420b46f5df4d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3d9d3cae48086b71f7eef205bb22871b88db17385a65d5172006420b46f5df4d", kill_on_drop: false }`
[INFO] [stdout] 3d9d3cae48086b71f7eef205bb22871b88db17385a65d5172006420b46f5df4d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+0c70cfbec949d241375e31c5a42066be70c720fc" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] abd15f764d5ed4b35b82d6c2581cd0e1639334783400b8e640e9f58acd4a0c06
[INFO] running `Command { std: "docker" "start" "-a" "abd15f764d5ed4b35b82d6c2581cd0e1639334783400b8e640e9f58acd4a0c06", kill_on_drop: false }`
[INFO] [stderr]     Checking either v1.15.0
[INFO] [stderr]     Checking itertools v0.14.0
[INFO] [stderr]     Checking sudoku-utils v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `fast_solver::FastBruteForceSolver`
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use fast_solver::FastBruteForceSolver;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `fast_solver::FastBruteForceSolver`
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use fast_solver::FastBruteForceSolver;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `N_DIGITS` is never used
[INFO] [stdout]  --> src/fast_solver.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | const N_DIGITS: usize = 9;
[INFO] [stdout]   |       ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `N_BANDS` is never used
[INFO] [stdout]  --> src/fast_solver.rs:6:7
[INFO] [stdout]   |
[INFO] [stdout] 6 | const N_BANDS: usize = 3;
[INFO] [stdout]   |       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `N_SUBBANDS` is never used
[INFO] [stdout]  --> src/fast_solver.rs:7:7
[INFO] [stdout]   |
[INFO] [stdout] 7 | const N_SUBBANDS: usize = N_DIGITS * N_BANDS;
[INFO] [stdout]   |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `N_CELLS` is never used
[INFO] [stdout]  --> src/fast_solver.rs:8:7
[INFO] [stdout]   |
[INFO] [stdout] 8 | const N_CELLS: usize = 81;
[INFO] [stdout]   |       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `NONE` is never used
[INFO] [stdout]   --> src/fast_solver.rs:10:7
[INFO] [stdout]    |
[INFO] [stdout] 10 | const NONE: u32 = 0;
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `ALL` is never used
[INFO] [stdout]   --> src/fast_solver.rs:11:7
[INFO] [stdout]    |
[INFO] [stdout] 11 | const ALL: u32 = 0o_777_777_777;
[INFO] [stdout]    |       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `LOW9` is never used
[INFO] [stdout]   --> src/fast_solver.rs:12:7
[INFO] [stdout]    |
[INFO] [stdout] 12 | const LOW9: u32 = 0o_777;
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Unsolvable` is never constructed
[INFO] [stdout]   --> src/fast_solver.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct Unsolvable {}
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Solutions` is never used
[INFO] [stdout]   --> src/fast_solver.rs:20:6
[INFO] [stdout]    |
[INFO] [stdout] 20 | enum Solutions<'a> {
[INFO] [stdout]    |      ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `len` is never used
[INFO] [stdout]   --> src/fast_solver.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | impl<'a> Solutions<'a> {
[INFO] [stdout]    | ---------------------- method in this implementation
[INFO] [stdout] 26 |
[INFO] [stdout] 27 |     fn len(&self) -> usize {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `UncheckedIndexArray` is never constructed
[INFO] [stdout]   --> src/fast_solver.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | struct UncheckedIndexArray<T, const N: usize>([T; N]);
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `FastBruteForceSolver` is never constructed
[INFO] [stdout]   --> src/fast_solver.rs:59:12
[INFO] [stdout]    |
[INFO] [stdout] 59 | pub struct FastBruteForceSolver {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated items are never used
[INFO] [stdout]    --> src/fast_solver.rs:68:12
[INFO] [stdout]     |
[INFO] [stdout]  66 | impl FastBruteForceSolver {
[INFO] [stdout]     | ------------------------- associated items in this implementation
[INFO] [stdout]  67 |
[INFO] [stdout]  68 |     pub fn has_solution(sudoku: &Sudoku) -> bool {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  72 |     pub fn has_unique_solution(sudoku: &Sudoku) -> bool {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  76 |     pub fn count_solutions(sudoku: &Sudoku) -> usize {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  80 |     fn from_sudoku(sudoku: &Sudoku) -> Result<Self, Unsolvable> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  97 |     fn all_solutions_up_to(self, limit: usize) -> Vec<Sudoku> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 103 |     fn count_solutions_up_to(self, limit: usize) -> usize {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 109 |     fn solutions_up_to(mut self, limit: usize, solutions: &mut Solutions) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 117 |     fn is_solved(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 123 |     fn solve(&mut self, limit: usize, solutions: &mut Solutions) -> Result<(), Unsolvable> {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 139 |     fn guess(&mut self, limit: usize, solutions: &mut Solutions) {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 149 |     fn guess_bivalue(&mut self, limit: usize, solutions: &mut Solutions) -> Result<(), Unsolvable> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 189 |     fn guess_some_cell(&mut self, limit: usize, solutions: &mut Solutions) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 226 |     fn store_solution(&self, solutions: &mut Solutions) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 234 |     fn extract_solution(&self) -> Sudoku {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 250 |     fn find_naked_singles(&mut self) -> Result<bool, Unsolvable> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 302 |     fn find_locked_candidates_and_update(&mut self) -> Result<(), Unsolvable> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 344 |     fn find_locked_candidates_and_update_subband(&mut self, subband: usize) -> Result<(), Unsolvable> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 401 |     fn insert_value_by_mask(&mut self, subband: usize, mask: u32) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 408 |     fn insert_value(&mut self, cell: usize, value: u8) -> Result<(), Unsolvable> {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `nonconflicting_cells_same_band` is never used
[INFO] [stdout]    --> src/fast_solver.rs:439:4
[INFO] [stdout]     |
[INFO] [stdout] 439 | fn nonconflicting_cells_same_band(cell: usize) -> u32 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `nonconflicting_cells_neighbour_bands` is never used
[INFO] [stdout]    --> src/fast_solver.rs:455:4
[INFO] [stdout]     |
[INFO] [stdout] 455 | fn nonconflicting_cells_neighbour_bands(cell: usize) -> u32 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `nonconflicting_cells_same_band_by_locked_candidates` is never used
[INFO] [stdout]    --> src/fast_solver.rs:471:4
[INFO] [stdout]     |
[INFO] [stdout] 471 | fn nonconflicting_cells_same_band_by_locked_candidates(shrink: u32) -> u32 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `nonconflicting_cells_neighbour_bands_by_locked_candidates` is never used
[INFO] [stdout]    --> src/fast_solver.rs:542:4
[INFO] [stdout]     |
[INFO] [stdout] 542 | fn nonconflicting_cells_neighbour_bands_by_locked_candidates(columns: u32) -> u32 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `locked_minirows` is never used
[INFO] [stdout]    --> src/fast_solver.rs:613:4
[INFO] [stdout]     |
[INFO] [stdout] 613 | fn locked_minirows(shrink: u32) -> u32 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `column_single` is never used
[INFO] [stdout]    --> src/fast_solver.rs:652:4
[INFO] [stdout]     |
[INFO] [stdout] 652 | fn column_single(shrink: u32) -> u32 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `neighbour_subbands` is never used
[INFO] [stdout]    --> src/fast_solver.rs:691:4
[INFO] [stdout]     |
[INFO] [stdout] 691 | fn neighbour_subbands(subband: usize) -> (usize, usize) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `row_mask` is never used
[INFO] [stdout]    --> src/fast_solver.rs:707:4
[INFO] [stdout]     |
[INFO] [stdout] 707 | fn row_mask(shrink_mask: u32) -> u32 {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `shrink_mask` is never used
[INFO] [stdout]    --> src/fast_solver.rs:716:4
[INFO] [stdout]     |
[INFO] [stdout] 716 | fn shrink_mask(cell_mask: u32) -> u32 {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mask_iter` is never used
[INFO] [stdout]    --> src/fast_solver.rs:740:4
[INFO] [stdout]     |
[INFO] [stdout] 740 | fn mask_iter(mask: u32) -> impl Iterator<Item = u32> {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `N_DIGITS` is never used
[INFO] [stdout]  --> src/fast_solver.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | const N_DIGITS: usize = 9;
[INFO] [stdout]   |       ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `N_BANDS` is never used
[INFO] [stdout]  --> src/fast_solver.rs:6:7
[INFO] [stdout]   |
[INFO] [stdout] 6 | const N_BANDS: usize = 3;
[INFO] [stdout]   |       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `N_SUBBANDS` is never used
[INFO] [stdout]  --> src/fast_solver.rs:7:7
[INFO] [stdout]   |
[INFO] [stdout] 7 | const N_SUBBANDS: usize = N_DIGITS * N_BANDS;
[INFO] [stdout]   |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `N_CELLS` is never used
[INFO] [stdout]  --> src/fast_solver.rs:8:7
[INFO] [stdout]   |
[INFO] [stdout] 8 | const N_CELLS: usize = 81;
[INFO] [stdout]   |       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `NONE` is never used
[INFO] [stdout]   --> src/fast_solver.rs:10:7
[INFO] [stdout]    |
[INFO] [stdout] 10 | const NONE: u32 = 0;
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `ALL` is never used
[INFO] [stdout]   --> src/fast_solver.rs:11:7
[INFO] [stdout]    |
[INFO] [stdout] 11 | const ALL: u32 = 0o_777_777_777;
[INFO] [stdout]    |       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `LOW9` is never used
[INFO] [stdout]   --> src/fast_solver.rs:12:7
[INFO] [stdout]    |
[INFO] [stdout] 12 | const LOW9: u32 = 0o_777;
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Unsolvable` is never constructed
[INFO] [stdout]   --> src/fast_solver.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct Unsolvable {}
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Solutions` is never used
[INFO] [stdout]   --> src/fast_solver.rs:20:6
[INFO] [stdout]    |
[INFO] [stdout] 20 | enum Solutions<'a> {
[INFO] [stdout]    |      ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `len` is never used
[INFO] [stdout]   --> src/fast_solver.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | impl<'a> Solutions<'a> {
[INFO] [stdout]    | ---------------------- method in this implementation
[INFO] [stdout] 26 |
[INFO] [stdout] 27 |     fn len(&self) -> usize {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `UncheckedIndexArray` is never constructed
[INFO] [stdout]   --> src/fast_solver.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | struct UncheckedIndexArray<T, const N: usize>([T; N]);
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `FastBruteForceSolver` is never constructed
[INFO] [stdout]   --> src/fast_solver.rs:59:12
[INFO] [stdout]    |
[INFO] [stdout] 59 | pub struct FastBruteForceSolver {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated items are never used
[INFO] [stdout]    --> src/fast_solver.rs:68:12
[INFO] [stdout]     |
[INFO] [stdout]  66 | impl FastBruteForceSolver {
[INFO] [stdout]     | ------------------------- associated items in this implementation
[INFO] [stdout]  67 |
[INFO] [stdout]  68 |     pub fn has_solution(sudoku: &Sudoku) -> bool {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  72 |     pub fn has_unique_solution(sudoku: &Sudoku) -> bool {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  76 |     pub fn count_solutions(sudoku: &Sudoku) -> usize {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  80 |     fn from_sudoku(sudoku: &Sudoku) -> Result<Self, Unsolvable> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  97 |     fn all_solutions_up_to(self, limit: usize) -> Vec<Sudoku> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 103 |     fn count_solutions_up_to(self, limit: usize) -> usize {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 109 |     fn solutions_up_to(mut self, limit: usize, solutions: &mut Solutions) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 117 |     fn is_solved(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 123 |     fn solve(&mut self, limit: usize, solutions: &mut Solutions) -> Result<(), Unsolvable> {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 139 |     fn guess(&mut self, limit: usize, solutions: &mut Solutions) {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 149 |     fn guess_bivalue(&mut self, limit: usize, solutions: &mut Solutions) -> Result<(), Unsolvable> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 189 |     fn guess_some_cell(&mut self, limit: usize, solutions: &mut Solutions) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 226 |     fn store_solution(&self, solutions: &mut Solutions) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 234 |     fn extract_solution(&self) -> Sudoku {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 250 |     fn find_naked_singles(&mut self) -> Result<bool, Unsolvable> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 302 |     fn find_locked_candidates_and_update(&mut self) -> Result<(), Unsolvable> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 344 |     fn find_locked_candidates_and_update_subband(&mut self, subband: usize) -> Result<(), Unsolvable> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 401 |     fn insert_value_by_mask(&mut self, subband: usize, mask: u32) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 408 |     fn insert_value(&mut self, cell: usize, value: u8) -> Result<(), Unsolvable> {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `nonconflicting_cells_same_band` is never used
[INFO] [stdout]    --> src/fast_solver.rs:439:4
[INFO] [stdout]     |
[INFO] [stdout] 439 | fn nonconflicting_cells_same_band(cell: usize) -> u32 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `nonconflicting_cells_neighbour_bands` is never used
[INFO] [stdout]    --> src/fast_solver.rs:455:4
[INFO] [stdout]     |
[INFO] [stdout] 455 | fn nonconflicting_cells_neighbour_bands(cell: usize) -> u32 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `nonconflicting_cells_same_band_by_locked_candidates` is never used
[INFO] [stdout]    --> src/fast_solver.rs:471:4
[INFO] [stdout]     |
[INFO] [stdout] 471 | fn nonconflicting_cells_same_band_by_locked_candidates(shrink: u32) -> u32 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `nonconflicting_cells_neighbour_bands_by_locked_candidates` is never used
[INFO] [stdout]    --> src/fast_solver.rs:542:4
[INFO] [stdout]     |
[INFO] [stdout] 542 | fn nonconflicting_cells_neighbour_bands_by_locked_candidates(columns: u32) -> u32 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `locked_minirows` is never used
[INFO] [stdout]    --> src/fast_solver.rs:613:4
[INFO] [stdout]     |
[INFO] [stdout] 613 | fn locked_minirows(shrink: u32) -> u32 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `column_single` is never used
[INFO] [stdout]    --> src/fast_solver.rs:652:4
[INFO] [stdout]     |
[INFO] [stdout] 652 | fn column_single(shrink: u32) -> u32 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `neighbour_subbands` is never used
[INFO] [stdout]    --> src/fast_solver.rs:691:4
[INFO] [stdout]     |
[INFO] [stdout] 691 | fn neighbour_subbands(subband: usize) -> (usize, usize) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `row_mask` is never used
[INFO] [stdout]    --> src/fast_solver.rs:707:4
[INFO] [stdout]     |
[INFO] [stdout] 707 | fn row_mask(shrink_mask: u32) -> u32 {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `shrink_mask` is never used
[INFO] [stdout]    --> src/fast_solver.rs:716:4
[INFO] [stdout]     |
[INFO] [stdout] 716 | fn shrink_mask(cell_mask: u32) -> u32 {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mask_iter` is never used
[INFO] [stdout]    --> src/fast_solver.rs:740:4
[INFO] [stdout]     |
[INFO] [stdout] 740 | fn mask_iter(mask: u32) -> impl Iterator<Item = u32> {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.42s
[INFO] running `Command { std: "docker" "inspect" "abd15f764d5ed4b35b82d6c2581cd0e1639334783400b8e640e9f58acd4a0c06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "abd15f764d5ed4b35b82d6c2581cd0e1639334783400b8e640e9f58acd4a0c06", kill_on_drop: false }`
[INFO] [stdout] abd15f764d5ed4b35b82d6c2581cd0e1639334783400b8e640e9f58acd4a0c06