[INFO] cloning repository https://github.com/joshuacox1/exact-cover
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/joshuacox1/exact-cover" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjoshuacox1%2Fexact-cover", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjoshuacox1%2Fexact-cover'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0f435891e004c4cf6aba04ac7353e45601b68545
[INFO] testing joshuacox1/exact-cover against 1.93.0 for beta-1.94-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjoshuacox1%2Fexact-cover" "/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/joshuacox1/exact-cover
[INFO] finished tweaking git repo https://github.com/joshuacox1/exact-cover
[INFO] tweaked toml for git repo https://github.com/joshuacox1/exact-cover written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/joshuacox1/exact-cover on toolchain 1.93.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.93.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/joshuacox1/exact-cover 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" "+1.93.0" "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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+1.93.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cd63c47abc4aa0a4bac81b4dd32777e4e7ba3476841b958bd6388254e48b1684
[INFO] running `Command { std: "docker" "start" "-a" "cd63c47abc4aa0a4bac81b4dd32777e4e7ba3476841b958bd6388254e48b1684", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cd63c47abc4aa0a4bac81b4dd32777e4e7ba3476841b958bd6388254e48b1684", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd63c47abc4aa0a4bac81b4dd32777e4e7ba3476841b958bd6388254e48b1684", kill_on_drop: false }`
[INFO] [stdout] cd63c47abc4aa0a4bac81b4dd32777e4e7ba3476841b958bd6388254e48b1684
[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=warn" "-e" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+1.93.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c1d85884f6221b1af010abee93478f330751995e474334c75a3528022f68724e
[INFO] running `Command { std: "docker" "start" "-a" "c1d85884f6221b1af010abee93478f330751995e474334c75a3528022f68724e", kill_on_drop: false }`
[INFO] [stderr]    Compiling either v1.15.0
[INFO] [stderr]    Compiling arrayvec v0.7.6
[INFO] [stderr]    Compiling bumpalo v3.19.0
[INFO] [stderr]    Compiling itertools v0.14.0
[INFO] [stderr]    Compiling exact_cover_solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `ExactCoverSolver`
[INFO] [stdout]  --> src/solver/representable.rs:2:17
[INFO] [stdout]   |
[INFO] [stdout] 2 |     ExactCover, ExactCoverSolver, ExactCoverProblem, PartialCover
[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: `arrayvec::ArrayVec`
[INFO] [stdout]  --> src/solver/solver.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use arrayvec::ArrayVec;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `itertools::Itertools`
[INFO] [stdout]  --> src/solver/solver.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use itertools::Itertools;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `ENTRY_IDX` should have an upper camel case name
[INFO] [stdout]   --> src/solver/solver.rs:83:6
[INFO] [stdout]    |
[INFO] [stdout] 83 | type ENTRY_IDX = u16;
[INFO] [stdout]    |      ^^^^^^^^^ help: convert the identifier to upper camel case: `EntryIdx`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `COL_OR_ROW_IDX` should have an upper camel case name
[INFO] [stdout]   --> src/solver/solver.rs:84:6
[INFO] [stdout]    |
[INFO] [stdout] 84 | type COL_OR_ROW_IDX = u16;
[INFO] [stdout]    |      ^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `ColOrRowIdx`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ExactCoverProblemError` and `SparseBinaryMatrix`
[INFO] [stdout]   --> src/solver/mod.rs:12:38
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub use problem::{ExactCoverProblem, ExactCoverProblemError,
[INFO] [stdout]    |                                      ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 13 | SparseBinaryMatrix};
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ExactCoverSolver`
[INFO] [stdout]  --> src/problems/n_queens.rs:7:21
[INFO] [stdout]   |
[INFO] [stdout] 7 |         ExactCover, ExactCoverSolver, ExactCoverProblem, PartialCover,
[INFO] [stdout]   |                     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `o_rows` and `empty_rows` are never read
[INFO] [stdout]   --> src/solver/solver.rs:59:5
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub struct ExactCoverSolver {
[INFO] [stdout]    |            ---------------- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 59 |     o_rows: Vec<usize>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 64 |     empty_rows: Vec<usize>,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ExactCoverSolver` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `MAX_COLS` is never used
[INFO] [stdout]   --> src/solver/solver.rs:73:7
[INFO] [stdout]    |
[INFO] [stdout] 73 | const MAX_COLS: usize = 4096;
[INFO] [stdout]    |       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `MAX_ROWS` is never used
[INFO] [stdout]   --> src/solver/solver.rs:74:7
[INFO] [stdout]    |
[INFO] [stdout] 74 | const MAX_ROWS: usize = 4096;
[INFO] [stdout]    |       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `MAX_ONES` is never used
[INFO] [stdout]   --> src/solver/solver.rs:75:7
[INFO] [stdout]    |
[INFO] [stdout] 75 | const MAX_ONES: usize = 65536 - MAX_COLS;
[INFO] [stdout]    |       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `ENTRY_IDX` is never used
[INFO] [stdout]   --> src/solver/solver.rs:83:6
[INFO] [stdout]    |
[INFO] [stdout] 83 | type ENTRY_IDX = u16;
[INFO] [stdout]    |      ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `COL_OR_ROW_IDX` is never used
[INFO] [stdout]   --> src/solver/solver.rs:84:6
[INFO] [stdout]    |
[INFO] [stdout] 84 | type COL_OR_ROW_IDX = u16;
[INFO] [stdout]    |      ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/solver/solver.rs:346:27
[INFO] [stdout]     |
[INFO] [stdout] 346 |     pub fn iter_solutions(&mut self) -> Solutions {
[INFO] [stdout]     |                           ^^^^^^^^^     ^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 346 |     pub fn iter_solutions(&mut self) -> Solutions<'_> {
[INFO] [stdout]     |                                                  ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/solver/solver.rs:351:23
[INFO] [stdout]     |
[INFO] [stdout] 351 |     pub fn iter_steps(&mut self) -> SolverSteps {
[INFO] [stdout]     |                       ^^^^^^^^^     ^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                       |
[INFO] [stdout]     |                       the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 351 |     pub fn iter_steps(&mut self) -> SolverSteps<'_> {
[INFO] [stdout]     |                                                ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Duration` and `Instant`
[INFO] [stdout]  --> src/main.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::time::{Duration, Instant};
[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: `bumpalo::Bump`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use bumpalo::Bump;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::sleep`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::thread::sleep;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `itertools::Itertools`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use itertools::Itertools;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `SolverStep`
[INFO] [stdout]  --> src/main.rs:8:48
[INFO] [stdout]   |
[INFO] [stdout] 8 |     ExactCoverSolver, ExactCoverRepresentable, SolverStep
[INFO] [stdout]   |                                                ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.75s
[INFO] running `Command { std: "docker" "inspect" "c1d85884f6221b1af010abee93478f330751995e474334c75a3528022f68724e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c1d85884f6221b1af010abee93478f330751995e474334c75a3528022f68724e", kill_on_drop: false }`
[INFO] [stdout] c1d85884f6221b1af010abee93478f330751995e474334c75a3528022f68724e
[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=warn" "-e" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+1.93.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eafd3a3bac68896723ed474f2d80769a8795fb777011d1fedabe456d6f22c9e8
[INFO] running `Command { std: "docker" "start" "-a" "eafd3a3bac68896723ed474f2d80769a8795fb777011d1fedabe456d6f22c9e8", kill_on_drop: false }`
[INFO] [stdout] warning: unused import: `ExactCoverSolver`
[INFO] [stdout]  --> src/solver/representable.rs:2:17
[INFO] [stdout]   |
[INFO] [stdout] 2 |     ExactCover, ExactCoverSolver, ExactCoverProblem, PartialCover
[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: `arrayvec::ArrayVec`
[INFO] [stdout]  --> src/solver/solver.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use arrayvec::ArrayVec;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `itertools::Itertools`
[INFO] [stdout]  --> src/solver/solver.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use itertools::Itertools;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `ENTRY_IDX` should have an upper camel case name
[INFO] [stdout]   --> src/solver/solver.rs:83:6
[INFO] [stdout]    |
[INFO] [stdout] 83 | type ENTRY_IDX = u16;
[INFO] [stdout]    |      ^^^^^^^^^ help: convert the identifier to upper camel case: `EntryIdx`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `COL_OR_ROW_IDX` should have an upper camel case name
[INFO] [stdout]   --> src/solver/solver.rs:84:6
[INFO] [stdout]    |
[INFO] [stdout] 84 | type COL_OR_ROW_IDX = u16;
[INFO] [stdout]    |      ^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `ColOrRowIdx`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ExactCoverProblemError` and `SparseBinaryMatrix`
[INFO] [stdout]   --> src/solver/mod.rs:12:38
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub use problem::{ExactCoverProblem, ExactCoverProblemError,
[INFO] [stdout]    |                                      ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 13 | SparseBinaryMatrix};
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ExactCoverSolver`
[INFO] [stdout]  --> src/problems/n_queens.rs:7:21
[INFO] [stdout]   |
[INFO] [stdout] 7 |         ExactCover, ExactCoverSolver, ExactCoverProblem, PartialCover,
[INFO] [stdout]   |                     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `o_rows` and `empty_rows` are never read
[INFO] [stdout]   --> src/solver/solver.rs:59:5
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub struct ExactCoverSolver {
[INFO] [stdout]    |            ---------------- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 59 |     o_rows: Vec<usize>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 64 |     empty_rows: Vec<usize>,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ExactCoverSolver` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `MAX_COLS` is never used
[INFO] [stdout]   --> src/solver/solver.rs:73:7
[INFO] [stdout]    |
[INFO] [stdout] 73 | const MAX_COLS: usize = 4096;
[INFO] [stdout]    |       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `MAX_ROWS` is never used
[INFO] [stdout]   --> src/solver/solver.rs:74:7
[INFO] [stdout]    |
[INFO] [stdout] 74 | const MAX_ROWS: usize = 4096;
[INFO] [stdout]    |       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `MAX_ONES` is never used
[INFO] [stdout]   --> src/solver/solver.rs:75:7
[INFO] [stdout]    |
[INFO] [stdout] 75 | const MAX_ONES: usize = 65536 - MAX_COLS;
[INFO] [stdout]    |       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `ENTRY_IDX` is never used
[INFO] [stdout]   --> src/solver/solver.rs:83:6
[INFO] [stdout]    |
[INFO] [stdout] 83 | type ENTRY_IDX = u16;
[INFO] [stdout]    |      ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `COL_OR_ROW_IDX` is never used
[INFO] [stdout]   --> src/solver/solver.rs:84:6
[INFO] [stdout]    |
[INFO] [stdout] 84 | type COL_OR_ROW_IDX = u16;
[INFO] [stdout]    |      ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/solver/solver.rs:346:27
[INFO] [stdout]     |
[INFO] [stdout] 346 |     pub fn iter_solutions(&mut self) -> Solutions {
[INFO] [stdout]     |                           ^^^^^^^^^     ^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 346 |     pub fn iter_solutions(&mut self) -> Solutions<'_> {
[INFO] [stdout]     |                                                  ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/solver/solver.rs:351:23
[INFO] [stdout]     |
[INFO] [stdout] 351 |     pub fn iter_steps(&mut self) -> SolverSteps {
[INFO] [stdout]     |                       ^^^^^^^^^     ^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                       |
[INFO] [stdout]     |                       the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 351 |     pub fn iter_steps(&mut self) -> SolverSteps<'_> {
[INFO] [stdout]     |                                                ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling exact_cover_solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Duration` and `Instant`
[INFO] [stdout]  --> src/main.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::time::{Duration, Instant};
[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: `bumpalo::Bump`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use bumpalo::Bump;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::sleep`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::thread::sleep;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `itertools::Itertools`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use itertools::Itertools;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `SolverStep`
[INFO] [stdout]  --> src/main.rs:8:48
[INFO] [stdout]   |
[INFO] [stdout] 8 |     ExactCoverSolver, ExactCoverRepresentable, SolverStep
[INFO] [stdout]   |                                                ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ExactCoverSolver`
[INFO] [stdout]  --> src/solver/representable.rs:2:17
[INFO] [stdout]   |
[INFO] [stdout] 2 |     ExactCover, ExactCoverSolver, ExactCoverProblem, PartialCover
[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: `arrayvec::ArrayVec`
[INFO] [stdout]  --> src/solver/solver.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use arrayvec::ArrayVec;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `itertools::Itertools`
[INFO] [stdout]  --> src/solver/solver.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use itertools::Itertools;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `ENTRY_IDX` should have an upper camel case name
[INFO] [stdout]   --> src/solver/solver.rs:83:6
[INFO] [stdout]    |
[INFO] [stdout] 83 | type ENTRY_IDX = u16;
[INFO] [stdout]    |      ^^^^^^^^^ help: convert the identifier to upper camel case: `EntryIdx`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `COL_OR_ROW_IDX` should have an upper camel case name
[INFO] [stdout]   --> src/solver/solver.rs:84:6
[INFO] [stdout]    |
[INFO] [stdout] 84 | type COL_OR_ROW_IDX = u16;
[INFO] [stdout]    |      ^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `ColOrRowIdx`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ExactCoverRepresentable` and `problems::NQueens`
[INFO] [stdout]  --> src/solver/tests/cases.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     problems::NQueens,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 8 |     solver::{ExactCover, ExactCoverSolver, ExactCoverRepresentable,
[INFO] [stdout]   |                                            ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ExactCoverProblemError`
[INFO] [stdout]   --> src/solver/mod.rs:12:38
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub use problem::{ExactCoverProblem, ExactCoverProblemError,
[INFO] [stdout]    |                                      ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `o_rows` and `empty_rows` are never read
[INFO] [stdout]   --> src/solver/solver.rs:59:5
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub struct ExactCoverSolver {
[INFO] [stdout]    |            ---------------- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 59 |     o_rows: Vec<usize>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 64 |     empty_rows: Vec<usize>,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ExactCoverSolver` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `MAX_COLS` is never used
[INFO] [stdout]   --> src/solver/solver.rs:73:7
[INFO] [stdout]    |
[INFO] [stdout] 73 | const MAX_COLS: usize = 4096;
[INFO] [stdout]    |       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `MAX_ROWS` is never used
[INFO] [stdout]   --> src/solver/solver.rs:74:7
[INFO] [stdout]    |
[INFO] [stdout] 74 | const MAX_ROWS: usize = 4096;
[INFO] [stdout]    |       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `MAX_ONES` is never used
[INFO] [stdout]   --> src/solver/solver.rs:75:7
[INFO] [stdout]    |
[INFO] [stdout] 75 | const MAX_ONES: usize = 65536 - MAX_COLS;
[INFO] [stdout]    |       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `ENTRY_IDX` is never used
[INFO] [stdout]   --> src/solver/solver.rs:83:6
[INFO] [stdout]    |
[INFO] [stdout] 83 | type ENTRY_IDX = u16;
[INFO] [stdout]    |      ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `COL_OR_ROW_IDX` is never used
[INFO] [stdout]   --> src/solver/solver.rs:84:6
[INFO] [stdout]    |
[INFO] [stdout] 84 | type COL_OR_ROW_IDX = u16;
[INFO] [stdout]    |      ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/solver/solver.rs:346:27
[INFO] [stdout]     |
[INFO] [stdout] 346 |     pub fn iter_solutions(&mut self) -> Solutions {
[INFO] [stdout]     |                           ^^^^^^^^^     ^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 346 |     pub fn iter_solutions(&mut self) -> Solutions<'_> {
[INFO] [stdout]     |                                                  ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/solver/solver.rs:351:23
[INFO] [stdout]     |
[INFO] [stdout] 351 |     pub fn iter_steps(&mut self) -> SolverSteps {
[INFO] [stdout]     |                       ^^^^^^^^^     ^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                       |
[INFO] [stdout]     |                       the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 351 |     pub fn iter_steps(&mut self) -> SolverSteps<'_> {
[INFO] [stdout]     |                                                ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.13s
[INFO] running `Command { std: "docker" "inspect" "eafd3a3bac68896723ed474f2d80769a8795fb777011d1fedabe456d6f22c9e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eafd3a3bac68896723ed474f2d80769a8795fb777011d1fedabe456d6f22c9e8", kill_on_drop: false }`
[INFO] [stdout] eafd3a3bac68896723ed474f2d80769a8795fb777011d1fedabe456d6f22c9e8
[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=warn" "-e" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+1.93.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 57617eba25103648238ca049ffbb3a3b417e9ce40a8a3362dba48d7af9166652
[INFO] running `Command { std: "docker" "start" "-a" "57617eba25103648238ca049ffbb3a3b417e9ce40a8a3362dba48d7af9166652", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `ExactCoverSolver`
[INFO] [stderr]  --> src/solver/representable.rs:2:17
[INFO] [stderr]   |
[INFO] [stderr] 2 |     ExactCover, ExactCoverSolver, ExactCoverProblem, PartialCover
[INFO] [stderr]   |                 ^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `arrayvec::ArrayVec`
[INFO] [stderr]  --> src/solver/solver.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use arrayvec::ArrayVec;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `itertools::Itertools`
[INFO] [stderr]  --> src/solver/solver.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use itertools::Itertools;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type `ENTRY_IDX` should have an upper camel case name
[INFO] [stderr]   --> src/solver/solver.rs:83:6
[INFO] [stderr]    |
[INFO] [stderr] 83 | type ENTRY_IDX = u16;
[INFO] [stderr]    |      ^^^^^^^^^ help: convert the identifier to upper camel case: `EntryIdx`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_camel_case_types)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `COL_OR_ROW_IDX` should have an upper camel case name
[INFO] [stderr]   --> src/solver/solver.rs:84:6
[INFO] [stderr]    |
[INFO] [stderr] 84 | type COL_OR_ROW_IDX = u16;
[INFO] [stderr]    |      ^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `ColOrRowIdx`
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `ExactCoverProblemError` and `SparseBinaryMatrix`
[INFO] [stderr]   --> src/solver/mod.rs:12:38
[INFO] [stderr]    |
[INFO] [stderr] 12 | pub use problem::{ExactCoverProblem, ExactCoverProblemError,
[INFO] [stderr]    |                                      ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 13 | SparseBinaryMatrix};
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `ExactCoverSolver`
[INFO] [stderr]  --> src/problems/n_queens.rs:7:21
[INFO] [stderr]   |
[INFO] [stderr] 7 |         ExactCover, ExactCoverSolver, ExactCoverProblem, PartialCover,
[INFO] [stderr]   |                     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: fields `o_rows` and `empty_rows` are never read
[INFO] [stderr]   --> src/solver/solver.rs:59:5
[INFO] [stderr]    |
[INFO] [stderr] 54 | pub struct ExactCoverSolver {
[INFO] [stderr]    |            ---------------- fields in this struct
[INFO] [stderr] ...
[INFO] [stderr] 59 |     o_rows: Vec<usize>,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 64 |     empty_rows: Vec<usize>,
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `ExactCoverSolver` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: constant `MAX_COLS` is never used
[INFO] [stderr]   --> src/solver/solver.rs:73:7
[INFO] [stderr]    |
[INFO] [stderr] 73 | const MAX_COLS: usize = 4096;
[INFO] [stderr]    |       ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant `MAX_ROWS` is never used
[INFO] [stderr]   --> src/solver/solver.rs:74:7
[INFO] [stderr]    |
[INFO] [stderr] 74 | const MAX_ROWS: usize = 4096;
[INFO] [stderr]    |       ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant `MAX_ONES` is never used
[INFO] [stderr]   --> src/solver/solver.rs:75:7
[INFO] [stderr]    |
[INFO] [stderr] 75 | const MAX_ONES: usize = 65536 - MAX_COLS;
[INFO] [stderr]    |       ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type alias `ENTRY_IDX` is never used
[INFO] [stderr]   --> src/solver/solver.rs:83:6
[INFO] [stderr]    |
[INFO] [stderr] 83 | type ENTRY_IDX = u16;
[INFO] [stderr]    |      ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type alias `COL_OR_ROW_IDX` is never used
[INFO] [stderr]   --> src/solver/solver.rs:84:6
[INFO] [stderr]    |
[INFO] [stderr] 84 | type COL_OR_ROW_IDX = u16;
[INFO] [stderr]    |      ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/solver/solver.rs:346:27
[INFO] [stderr]     |
[INFO] [stderr] 346 |     pub fn iter_solutions(&mut self) -> Solutions {
[INFO] [stderr]     |                           ^^^^^^^^^     ^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                           |
[INFO] [stderr]     |                           the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 346 |     pub fn iter_solutions(&mut self) -> Solutions<'_> {
[INFO] [stderr]     |                                                  ++++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/solver/solver.rs:351:23
[INFO] [stderr]     |
[INFO] [stderr] 351 |     pub fn iter_steps(&mut self) -> SolverSteps {
[INFO] [stderr]     |                       ^^^^^^^^^     ^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |                       |
[INFO] [stderr]     |                       the lifetime is elided here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 351 |     pub fn iter_steps(&mut self) -> SolverSteps<'_> {
[INFO] [stderr]     |                                                ++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `ExactCoverRepresentable` and `problems::NQueens`
[INFO] [stderr]  --> src/solver/tests/cases.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     problems::NQueens,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 8 |     solver::{ExactCover, ExactCoverSolver, ExactCoverRepresentable,
[INFO] [stderr]   |                                            ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `ExactCoverProblemError`
[INFO] [stderr]   --> src/solver/mod.rs:12:38
[INFO] [stderr]    |
[INFO] [stderr] 12 | pub use problem::{ExactCoverProblem, ExactCoverProblemError,
[INFO] [stderr]    |                                      ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `exact_cover_solver` (lib) generated 15 warnings (run `cargo fix --lib -p exact_cover_solver` to apply 7 suggestions)
[INFO] [stderr] warning: `exact_cover_solver` (lib test) generated 15 warnings (13 duplicates) (run `cargo fix --lib -p exact_cover_solver --tests` to apply 2 suggestions)
[INFO] [stderr] warning: unused imports: `Duration` and `Instant`
[INFO] [stderr]  --> src/main.rs:1:17
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::time::{Duration, Instant};
[INFO] [stderr]   |                 ^^^^^^^^  ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `bumpalo::Bump`
[INFO] [stderr]  --> src/main.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use bumpalo::Bump;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::thread::sleep`
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::thread::sleep;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `itertools::Itertools`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use itertools::Itertools;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `SolverStep`
[INFO] [stderr]  --> src/main.rs:8:48
[INFO] [stderr]   |
[INFO] [stderr] 8 |     ExactCoverSolver, ExactCoverRepresentable, SolverStep
[INFO] [stderr]   |                                                ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `exact_cover_solver` (bin "exact_cover_solver" test) generated 5 warnings (run `cargo fix --bin "exact_cover_solver" -p exact_cover_solver --tests` to apply 5 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/exact_cover_solver-38d978f61dc9ca67)
[INFO] [stdout] 
[INFO] [stdout] running 15 tests
[INFO] [stdout] test problems::n_queens::test::n_queens_0_equal_to_brute_force ... ok
[INFO] [stdout] test problems::n_queens::test::n_queens_2_equal_to_brute_force ... ok
[INFO] [stdout] test problems::n_queens::test::n_queens_3_equal_to_brute_force ... ok
[INFO] [stdout] test solver::problem::test::test_ordered_points_rows ... ok
[INFO] [stdout] test solver::tests::cases::check_solutions_zero_rows_three_cols ... ok
[INFO] [stdout] test problems::n_queens::test::n_queens_4_equal_to_brute_force ... ok
[INFO] [stdout] test problems::n_queens::test::n_queens_5_equal_to_brute_force ... ok
[INFO] [stdout] test problems::n_queens::test::n_queens_1_equal_to_brute_force ... ok
[INFO] [stdout] test solver::tests::cases::check_solutions_zero_by_zero ... ok
[INFO] [stdout] test solver::tests::cases::check_solutions_knuth_simple ... ok
[INFO] [stdout] test solver::tests::cases::check_solutions_zero_rows_three_cols_all_secondary ... ok
[INFO] [stdout] test problems::n_queens::test::n_queens_6_equal_to_brute_force ... ok
[INFO] [stdout] test solver::tests::cases::check_solutions_three_rows_zero_cols ... FAILED
[INFO] [stdout] test problems::n_queens::test::n_queens_7_equal_to_brute_force ... ok
[INFO] [stdout] test problems::n_queens::test::n_queens_8_equal_to_brute_force ... ok
[INFO] [stderr] error: test failed, to rerun pass `--lib`
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- solver::tests::cases::check_solutions_three_rows_zero_cols stdout ----
[INFO] [stdout] 
[INFO] [stdout] thread 'solver::tests::cases::check_solutions_three_rows_zero_cols' (36) panicked at src/solver/problem.rs:79:9:
[INFO] [stdout] attempt to subtract with overflow
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x5b0e3affe2b2 - std::backtrace_rs::backtrace::libunwind::trace::h90e89fac33585832
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x5b0e3affe2b2 - std::backtrace_rs::backtrace::trace_unsynchronized::heebcf2380a8e7359
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x5b0e3affe2b2 - std::sys::backtrace::_print_fmt::hdf3e2a22d2f810db
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/sys/backtrace.rs:68:9
[INFO] [stdout]    3:     0x5b0e3affe2b2 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hac1d885928ba8582
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/sys/backtrace.rs:38:26
[INFO] [stdout]    4:     0x5b0e3b00e177 - core::fmt::rt::Argument::fmt::h6901eb7c19abebe8
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/fmt/rt.rs:152:76
[INFO] [stdout]    5:     0x5b0e3b00e177 - core::fmt::write::h83ebb4d32483be9e
[INFO] [stdout]    6:     0x5b0e3afcd066 - std::io::default_write_fmt::h751a79cdae495f10
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/io/mod.rs:639:11
[INFO] [stdout]    7:     0x5b0e3afcd066 - std::io::Write::write_fmt::h9ef514f8700ff7b2
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/io/mod.rs:1994:13
[INFO] [stdout]    8:     0x5b0e3afdd679 - std::sys::backtrace::BacktraceLock::print::hcc2e1a3ac996c911
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/sys/backtrace.rs:41:9
[INFO] [stdout]    9:     0x5b0e3afdd679 - std::panicking::default_hook::{{closure}}::h8e9c4d1276f0925f
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:292:27
[INFO] [stdout]   10:     0x5b0e3afdd511 - std::panicking::default_hook::h2b2078d38b534dfb
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:316:9
[INFO] [stdout]   11:     0x5b0e3afa002e - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h39d051e7dedac6a7
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/alloc/src/boxed.rs:2220:9
[INFO] [stdout]   12:     0x5b0e3afa002e - test::test_main_with_exit_callback::{{closure}}::h4b005fe75814c302
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/test/src/lib.rs:145:21
[INFO] [stdout]   13:     0x5b0e3afdd8f2 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hd426070722c13cbf
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/alloc/src/boxed.rs:2220:9
[INFO] [stdout]   14:     0x5b0e3afdd8f2 - std::panicking::panic_with_hook::h39b739724e701bfd
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:833:13
[INFO] [stdout]   15:     0x5b0e3afdd76a - std::panicking::panic_handler::{{closure}}::he540c4833054e458
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:691:13
[INFO] [stdout]   16:     0x5b0e3afd8d09 - std::sys::backtrace::__rust_end_short_backtrace::hfa179d89deec8aed
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/sys/backtrace.rs:176:18
[INFO] [stdout]   17:     0x5b0e3afc1e2d - __rustc[d131491b17107b07]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:689:5
[INFO] [stdout]   18:     0x5b0e3b0156ac - core::panicking::panic_fmt::ha564519d657d9c46
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/panicking.rs:80:14
[INFO] [stdout]   19:     0x5b0e3b0153b9 - core::panicking::panic_const::panic_const_sub_overflow::ha7812305f64855aa
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/panicking.rs:175:17
[INFO] [stdout]   20:     0x5b0e3af6ade1 - exact_cover_solver::solver::problem::ExactCoverProblem::primary_columns::hf0f0cab8422dcd4d
[INFO] [stdout]                                at /opt/rustwide/workdir/src/solver/problem.rs:79:9
[INFO] [stdout]   21:     0x5b0e3af66ac7 - exact_cover_solver::solver::solver::ExactCoverSolver::new::hc61f98b34c14a32b
[INFO] [stdout]                                at /opt/rustwide/workdir/src/solver/solver.rs:112:36
[INFO] [stdout]   22:     0x5b0e3af74b49 - exact_cover_solver::solver::tests::cases::TestCase::assert_solution_match::hc4180ae46dd822fe
[INFO] [stdout]                                at /opt/rustwide/workdir/src/solver/tests/cases.rs:17:27
[INFO] [stdout]   23:     0x5b0e3af7436b - exact_cover_solver::solver::tests::cases::check_solutions_three_rows_zero_cols::h6b4d9a2b36ae0ae1
[INFO] [stdout]                                at /opt/rustwide/workdir/src/solver/tests/cases.rs:117:76
[INFO] [stdout]   24:     0x5b0e3af74387 - exact_cover_solver::solver::tests::cases::check_solutions_three_rows_zero_cols::{{closure}}::h4efa86755b8a6456
[INFO] [stdout]                                at /opt/rustwide/workdir/src/solver/tests/cases.rs:117:50
[INFO] [stdout]   25:     0x5b0e3af70006 - core::ops::function::FnOnce::call_once::h959bb5809d31eb40
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   26:     0x5b0e3af9fe5b - core::ops::function::FnOnce::call_once::h0217b30cfdee2e67
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   27:     0x5b0e3af9fe5b - test::__rust_begin_short_backtrace::h6d98714a1e28f556
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/test/src/lib.rs:663:18
[INFO] [stdout]   28:     0x5b0e3afb37ea - test::run_test_in_process::{{closure}}::he2c70d2634d3a3cc
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/test/src/lib.rs:686:74
[INFO] [stdout]   29:     0x5b0e3afb37ea - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h40a0a825bcf17fdd
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   30:     0x5b0e3afb37ea - std::panicking::catch_unwind::do_call::h6c8eb5dd6e7b5975
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:581:40
[INFO] [stdout]   31:     0x5b0e3afb37ea - std::panicking::catch_unwind::h55455eac2972ad1e
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:544:19
[INFO] [stdout]   32:     0x5b0e3afb37ea - std::panic::catch_unwind::h0025465150a5e558
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panic.rs:359:14
[INFO] [stdout]   33:     0x5b0e3afb37ea - test::run_test_in_process::hb61e682f9b630fbc
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/test/src/lib.rs:686:27
[INFO] [stdout]   34:     0x5b0e3afb37ea - test::run_test::{{closure}}::hc2c2a7a38ab176e2
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/test/src/lib.rs:607:43
[INFO] [stdout]   35:     0x5b0e3af8da84 - test::run_test::{{closure}}::ha91867b85cd2a911
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/test/src/lib.rs:637:41
[INFO] [stdout]   36:     0x5b0e3af8da84 - std::sys::backtrace::__rust_begin_short_backtrace::ha00a9fe02049c339
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/sys/backtrace.rs:160:18
[INFO] [stdout]   37:     0x5b0e3af913b2 - std::thread::lifecycle::spawn_unchecked::{{closure}}::{{closure}}::hd629fba9153dfb55
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/thread/lifecycle.rs:92:13
[INFO] [stdout]   38:     0x5b0e3af913b2 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h4189018816a5c5d9
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   39:     0x5b0e3af913b2 - std::panicking::catch_unwind::do_call::hf9fcdbca3c2e9877
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:581:40
[INFO] [stdout]   40:     0x5b0e3af913b2 - std::panicking::catch_unwind::h97b92d88631c7c64
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:544:19
[INFO] [stdout]   41:     0x5b0e3af913b2 - std::panic::catch_unwind::ha77cdbb68e725e5e
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panic.rs:359:14
[INFO] [stdout]   42:     0x5b0e3af913b2 - std::thread::lifecycle::spawn_unchecked::{{closure}}::h511f05bc1a132253
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/thread/lifecycle.rs:90:26
[INFO] [stdout]   43:     0x5b0e3af913b2 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h6b68b31e9b685cb8
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   44:     0x5b0e3afd439f - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h22a27d165e4e871d
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/alloc/src/boxed.rs:2206:9
[INFO] [stdout]   45:     0x5b0e3afd439f - std::sys::thread::unix::Thread::new::thread_start::h45cc87bb053add0f
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/sys/thread/unix.rs:118:17
[INFO] [stdout]   46:     0x7ebb15365aa4 - <unknown>
[INFO] [stdout]   47:     0x7ebb153f2a64 - clone
[INFO] [stdout]   48:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     solver::tests::cases::check_solutions_three_rows_zero_cols
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 14 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.71s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "57617eba25103648238ca049ffbb3a3b417e9ce40a8a3362dba48d7af9166652", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57617eba25103648238ca049ffbb3a3b417e9ce40a8a3362dba48d7af9166652", kill_on_drop: false }`
[INFO] [stdout] 57617eba25103648238ca049ffbb3a3b417e9ce40a8a3362dba48d7af9166652
