[INFO] cloning repository https://github.com/mkurth/rustysodoku
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mkurth/rustysodoku" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmkurth%2Frustysodoku", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmkurth%2Frustysodoku'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 29feba7bfa8914629753c1752bc4b8beb97fd78b
[INFO] testing mkurth/rustysodoku against beta-2020-10-09 for beta-1.48-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmkurth%2Frustysodoku" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mkurth/rustysodoku on toolchain beta-2020-10-09
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mkurth/rustysodoku
[INFO] finished tweaking git repo https://github.com/mkurth/rustysodoku
[INFO] tweaked toml for git repo https://github.com/mkurth/rustysodoku written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/mkurth/rustysodoku already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bd96438bc5fd8e196bc5264cb63e72719656b1b062d67e3148d73bf30d30a857
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "bd96438bc5fd8e196bc5264cb63e72719656b1b062d67e3148d73bf30d30a857", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bd96438bc5fd8e196bc5264cb63e72719656b1b062d67e3148d73bf30d30a857", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd96438bc5fd8e196bc5264cb63e72719656b1b062d67e3148d73bf30d30a857", kill_on_drop: false }`
[INFO] [stdout] bd96438bc5fd8e196bc5264cb63e72719656b1b062d67e3148d73bf30d30a857
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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=warn" "-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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 54decbdc1077e9b92d3f50c4e64fa54db0cc4eb36eb406e138c8ca77ffd50e50
[INFO] running `Command { std: "docker" "start" "-a" "54decbdc1077e9b92d3f50c4e64fa54db0cc4eb36eb406e138c8ca77ffd50e50", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustysodoku v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `cells`
[INFO] [stdout]   --> src/solver.rs:10:27
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn zip_with_all_solutions(cells: Vec<Vec<Cell>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stdout]    |                           ^^^^^ help: if this is intentional, prefix it with an underscore: `_cells`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cells`
[INFO] [stdout]   --> src/solver.rs:14:32
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn reduce_impossible_solutions(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stdout]    |                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_cells`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cells`
[INFO] [stdout]   --> src/solver.rs:18:29
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn reduce_possible_solution(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stdout]    |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_cells`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `zip_with_all_solutions`
[INFO] [stdout]   --> src/solver.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn zip_with_all_solutions(cells: Vec<Vec<Cell>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `reduce_impossible_solutions`
[INFO] [stdout]   --> src/solver.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn reduce_impossible_solutions(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `reduce_possible_solution`
[INFO] [stdout]   --> src/solver.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn reduce_possible_solution(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.08s
[INFO] running `Command { std: "docker" "inspect" "54decbdc1077e9b92d3f50c4e64fa54db0cc4eb36eb406e138c8ca77ffd50e50", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54decbdc1077e9b92d3f50c4e64fa54db0cc4eb36eb406e138c8ca77ffd50e50", kill_on_drop: false }`
[INFO] [stdout] 54decbdc1077e9b92d3f50c4e64fa54db0cc4eb36eb406e138c8ca77ffd50e50
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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=warn" "-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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0c43fe51327cd6abb5d76149d30c96045a2ac9f7604a49e29fdfe1ddf4e78e9b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "0c43fe51327cd6abb5d76149d30c96045a2ac9f7604a49e29fdfe1ddf4e78e9b", kill_on_drop: false }`
[INFO] [stdout] warning: unused variable: `cells`
[INFO] [stdout]   --> src/solver.rs:10:27
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn zip_with_all_solutions(cells: Vec<Vec<Cell>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stdout]    |                           ^^^^^ help: if this is intentional, prefix it with an underscore: `_cells`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rustysodoku v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `cells`
[INFO] [stdout]   --> src/solver.rs:14:32
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn reduce_impossible_solutions(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stdout]    |                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_cells`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cells`
[INFO] [stdout]   --> src/solver.rs:18:29
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn reduce_possible_solution(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stdout]    |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_cells`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `zip_with_all_solutions`
[INFO] [stdout]   --> src/solver.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn zip_with_all_solutions(cells: Vec<Vec<Cell>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `reduce_impossible_solutions`
[INFO] [stdout]   --> src/solver.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn reduce_impossible_solutions(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `reduce_possible_solution`
[INFO] [stdout]   --> src/solver.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn reduce_possible_solution(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cells`
[INFO] [stdout]   --> src/solver.rs:10:27
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn zip_with_all_solutions(cells: Vec<Vec<Cell>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stdout]    |                           ^^^^^ help: if this is intentional, prefix it with an underscore: `_cells`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cells`
[INFO] [stdout]   --> src/solver.rs:14:32
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn reduce_impossible_solutions(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stdout]    |                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_cells`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cells`
[INFO] [stdout]   --> src/solver.rs:18:29
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn reduce_possible_solution(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stdout]    |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_cells`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `zip_with_all_solutions`
[INFO] [stdout]   --> src/solver.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn zip_with_all_solutions(cells: Vec<Vec<Cell>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `reduce_impossible_solutions`
[INFO] [stdout]   --> src/solver.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn reduce_impossible_solutions(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `reduce_possible_solution`
[INFO] [stdout]   --> src/solver.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn reduce_possible_solution(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.78s
[INFO] running `Command { std: "docker" "inspect" "0c43fe51327cd6abb5d76149d30c96045a2ac9f7604a49e29fdfe1ddf4e78e9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c43fe51327cd6abb5d76149d30c96045a2ac9f7604a49e29fdfe1ddf4e78e9b", kill_on_drop: false }`
[INFO] [stdout] 0c43fe51327cd6abb5d76149d30c96045a2ac9f7604a49e29fdfe1ddf4e78e9b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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=warn" "-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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "test" "--frozen", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f15b7cf1af4a79c0b06c7b6efcd54dc09a9190f6a5d22650d1fc39b4cc1c7cae
[INFO] running `Command { std: "docker" "start" "-a" "f15b7cf1af4a79c0b06c7b6efcd54dc09a9190f6a5d22650d1fc39b4cc1c7cae", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `cells`
[INFO] [stderr]   --> src/solver.rs:10:27
[INFO] [stderr]    |
[INFO] [stderr] 10 | fn zip_with_all_solutions(cells: Vec<Vec<Cell>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stderr]    |                           ^^^^^ help: if this is intentional, prefix it with an underscore: `_cells`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `cells`
[INFO] [stderr]   --> src/solver.rs:14:32
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn reduce_impossible_solutions(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stderr]    |                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_cells`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `cells`
[INFO] [stderr]   --> src/solver.rs:18:29
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn reduce_possible_solution(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stderr]    |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_cells`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `cells`
[INFO] [stderr]   --> src/solver.rs:10:27
[INFO] [stderr]    |
[INFO] [stderr] 10 | fn zip_with_all_solutions(cells: Vec<Vec<Cell>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stderr]    |                           ^^^^^ help: if this is intentional, prefix it with an underscore: `_cells`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `zip_with_all_solutions`
[INFO] [stderr]   --> src/solver.rs:10:4
[INFO] [stderr]    |
[INFO] [stderr] 10 | fn zip_with_all_solutions(cells: Vec<Vec<Cell>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `cells`
[INFO] [stderr]   --> src/solver.rs:14:32
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn reduce_impossible_solutions(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stderr]    |                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_cells`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `reduce_impossible_solutions`
[INFO] [stderr]   --> src/solver.rs:14:4
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn reduce_impossible_solutions(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `cells`
[INFO] [stderr]   --> src/solver.rs:18:29
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn reduce_possible_solution(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stderr]    |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_cells`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `reduce_possible_solution`
[INFO] [stderr]   --> src/solver.rs:18:4
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn reduce_possible_solution(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `zip_with_all_solutions`
[INFO] [stderr]   --> src/solver.rs:10:4
[INFO] [stderr]    |
[INFO] [stderr] 10 | fn zip_with_all_solutions(cells: Vec<Vec<Cell>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 6 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `reduce_impossible_solutions`
[INFO] [stderr]   --> src/solver.rs:14:4
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn reduce_impossible_solutions(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `reduce_possible_solution`
[INFO] [stderr]   --> src/solver.rs:18:4
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn reduce_possible_solution(cells: Vec<Vec<(Cell, Vec<usize>)>>) -> Vec<Vec<(Cell, Vec<usize>)>> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 6 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/rustysodoku-0c5acbcaf8e7263d
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test solver::tests::ca_solve_2x2_with_only_one_missing_field ... ok
[INFO] [stdout] test solver::tests::can_solve_3x3_with_only_one_missing_field ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- solver::tests::can_solve_3x3_with_only_one_missing_field stdout ----
[INFO] [stdout] thread 'solver::tests::can_solve_3x3_with_only_one_missing_field' panicked at 'assertion failed: `(left == right)`
[INFO] [stdout]   left: `Empty`,
[INFO] [stdout]  right: `Filled { number: 2 }`', src/solver.rs:51:9
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x55b9ba148a00 - std::backtrace_rs::backtrace::libunwind::trace::h7cf3ca97bd83fbab
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/../../backtrace/src/backtrace/libunwind.rs:96
[INFO] [stdout]    1:     0x55b9ba148a00 - std::backtrace_rs::backtrace::trace_unsynchronized::h5a69c674b2d9ea5c
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/../../backtrace/src/backtrace/mod.rs:66
[INFO] [stdout]    2:     0x55b9ba148a00 - std::sys_common::backtrace::_print_fmt::hdf72478dfcb50678
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/sys_common/backtrace.rs:79
[INFO] [stdout]    3:     0x55b9ba148a00 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h1e0bdbb35e83deca
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/sys_common/backtrace.rs:58
[INFO] [stdout]    4:     0x55b9ba16ac9c - core::fmt::write::he67f9b17bcb7ee73
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/core/src/fmt/mod.rs:1080
[INFO] [stdout]    5:     0x55b9ba0f44c6 - std::io::Write::write_fmt::h68b2e5fe4c78e61a
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/io/mod.rs:1516
[INFO] [stdout]    6:     0x55b9ba14321d - std::io::impls::<impl std::io::Write for alloc::boxed::Box<W>>::write_fmt::he9ebec865e28165c
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/io/impls.rs:179
[INFO] [stdout]    7:     0x55b9ba14af1d - std::sys_common::backtrace::_print::haa20918e28a126c5
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/sys_common/backtrace.rs:61
[INFO] [stdout]    8:     0x55b9ba14af1d - std::sys_common::backtrace::print::h49e772a4873d9076
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/sys_common/backtrace.rs:48
[INFO] [stdout]    9:     0x55b9ba14af1d - std::panicking::default_hook::{{closure}}::hb218b305d15e3f11
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:208
[INFO] [stdout]   10:     0x55b9ba14ab72 - std::panicking::default_hook::h63997b7b949e1ce0
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:224
[INFO] [stdout]   11:     0x55b9ba14b601 - std::panicking::rust_panic_with_hook::hb54f09ccadf64bd3
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:577
[INFO] [stdout]   12:     0x55b9ba14b1a9 - std::panicking::begin_panic_handler::{{closure}}::h8b43445b254eeb30
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:484
[INFO] [stdout]   13:     0x55b9ba148e8c - std::sys_common::backtrace::__rust_end_short_backtrace::hacd691450edfeae0
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/sys_common/backtrace.rs:153
[INFO] [stdout]   14:     0x55b9ba14b169 - rust_begin_unwind
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:483
[INFO] [stdout]   15:     0x55b9ba14b11b - std::panicking::begin_panic_fmt::hef75366dd3a9de61
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:437
[INFO] [stdout]   16:     0x55b9ba0f21f8 - rustysodoku::solver::tests::can_solve_3x3_with_only_one_missing_field::h2ae2ca18eb82c850
[INFO] [stdout]                                at /opt/rustwide/workdir/src/solver.rs:51
[INFO] [stdout]   17:     0x55b9ba0f1efa - rustysodoku::solver::tests::can_solve_3x3_with_only_one_missing_field::{{closure}}::h4d222834460cfdda
[INFO] [stdout]                                at /opt/rustwide/workdir/src/solver.rs:41
[INFO] [stdout]   18:     0x55b9ba0f22fe - core::ops::function::FnOnce::call_once::h8d01e7812cb5d2da
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/core/src/ops/function.rs:227
[INFO] [stdout]   19:     0x55b9ba11b2b3 - core::ops::function::FnOnce::call_once::hcd3fa2f0696c1015
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/core/src/ops/function.rs:227
[INFO] [stdout]   20:     0x55b9ba11b2b3 - test::__rust_begin_short_backtrace::h113f97c5e5ab7d4a
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/test/src/lib.rs:516
[INFO] [stdout]   21:     0x55b9ba1197b8 - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h01fd09163cae2442
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/alloc/src/boxed.rs:1042
[INFO] [stdout]   22:     0x55b9ba1197b8 - <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h0da6b685ae74a04a
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panic.rs:308
[INFO] [stdout]   23:     0x55b9ba1197b8 - std::panicking::try::do_call::h564a32f132f2c264
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:381
[INFO] [stdout]   24:     0x55b9ba1197b8 - std::panicking::try::h477cfd4b06a2e64a
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:345
[INFO] [stdout]   25:     0x55b9ba1197b8 - std::panic::catch_unwind::hdb5abc6d008c399d
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panic.rs:382
[INFO] [stdout]   26:     0x55b9ba1197b8 - test::run_test_in_process::he8ff7dec91b275be
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/test/src/lib.rs:543
[INFO] [stdout]   27:     0x55b9ba1197b8 - test::run_test::run_test_inner::{{closure}}::hfd9f49e4a4ff9162
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/test/src/lib.rs:449
[INFO] [stdout]   28:     0x55b9ba0f3846 - std::sys_common::backtrace::__rust_begin_short_backtrace::hee6d60d5bb466aff
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/sys_common/backtrace.rs:137
[INFO] [stdout]   29:     0x55b9ba0f89b5 - std::thread::Builder::spawn_unchecked::{{closure}}::{{closure}}::h988cecdf9ebbaf00
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/thread/mod.rs:464
[INFO] [stdout]   30:     0x55b9ba0f89b5 - <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h330cf727ec126982
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panic.rs:308
[INFO] [stdout]   31:     0x55b9ba0f89b5 - std::panicking::try::do_call::h6cd25078f4a5ea13
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:381
[INFO] [stdout]   32:     0x55b9ba0f89b5 - std::panicking::try::h84b1d49961301705
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:345
[INFO] [stdout]   33:     0x55b9ba0f89b5 - std::panic::catch_unwind::h6145324593b3654b
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panic.rs:382
[INFO] [stdout]   34:     0x55b9ba0f89b5 - std::thread::Builder::spawn_unchecked::{{closure}}::ha41e72e8024f9192
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/thread/mod.rs:463
[INFO] [stdout]   35:     0x55b9ba0f89b5 - core::ops::function::FnOnce::call_once{{vtable.shim}}::hfb5034cf1f1be223
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/core/src/ops/function.rs:227
[INFO] [stdout]   36:     0x55b9ba15162a - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::hd4d30e37db281e8f
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/alloc/src/boxed.rs:1042
[INFO] [stdout]   37:     0x55b9ba15162a - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h019185a215ba16e4
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/alloc/src/boxed.rs:1042
[INFO] [stdout]   38:     0x55b9ba15162a - std::sys::unix::thread::Thread::new::thread_start::h33c6d7cf25f9291f
[INFO] [stdout]                                at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/sys/unix/thread.rs:87
[INFO] [stdout]   39:     0x7f79d6ddc609 - start_thread
[INFO] [stdout]   40:     0x7f79d7067103 - clone
[INFO] [stdout]   41:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     solver::tests::can_solve_3x3_with_only_one_missing_field
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 1 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--lib'
[INFO] running `Command { std: "docker" "inspect" "f15b7cf1af4a79c0b06c7b6efcd54dc09a9190f6a5d22650d1fc39b4cc1c7cae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f15b7cf1af4a79c0b06c7b6efcd54dc09a9190f6a5d22650d1fc39b4cc1c7cae", kill_on_drop: false }`
[INFO] [stdout] f15b7cf1af4a79c0b06c7b6efcd54dc09a9190f6a5d22650d1fc39b4cc1c7cae
