[INFO] cloning repository https://github.com/joshuacox1/exact-cover
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[INFO] [stdout] 2b64382f8e520e4b0d725fdf930bacd9deba7610
[INFO] testing joshuacox1/exact-cover against master#f9988fefd3add01f414f52b414308e7872622fee for pr-155114
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjoshuacox1%2Fexact-cover" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
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[INFO] validating manifest of git repo https://github.com/joshuacox1/exact-cover on toolchain f9988fefd3add01f414f52b414308e7872622fee
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[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" "+f9988fefd3add01f414f52b414308e7872622fee" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[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: unused import: `ExactCover`
[INFO] [stdout]  --> src/problems/kaleidoscope.rs:4:32
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::{ExactCoverProblem, ExactCover, ExactCoverSolver};
[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: constant `GREY_RGB` is never used
[INFO] [stdout]    --> src/problems/kaleidoscope.rs:415:7
[INFO] [stdout]     |
[INFO] [stdout] 415 | const GREY_RGB: Rgb<u8> = Rgb([0x60, 0x60, 0x60]);
[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 imports: `ExactCoverRepresentable`, `ExactCoverSolver`, and `SolverStep`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     ExactCoverSolver, ExactCoverRepresentable, SolverStep
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `exact_cover_solver::NQueens`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use exact_cover_solver::NQueens;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1m 31s
[INFO] running `Command { std: "docker" "inspect" "dda098a4242a8093fa02684e1affdeaf8da14b181ff29e192d51b84ebdd9fffc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dda098a4242a8093fa02684e1affdeaf8da14b181ff29e192d51b84ebdd9fffc", kill_on_drop: false }`
[INFO] [stdout] dda098a4242a8093fa02684e1affdeaf8da14b181ff29e192d51b84ebdd9fffc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+f9988fefd3add01f414f52b414308e7872622fee" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fdada8d7fc59550fd79b8c409762b46e0d870d9ba0f0cfb44c28651d63b71240
[INFO] running `Command { std: "docker" "start" "-a" "fdada8d7fc59550fd79b8c409762b46e0d870d9ba0f0cfb44c28651d63b71240", kill_on_drop: false }`
[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: unused import: `ExactCover`
[INFO] [stdout]  --> src/problems/kaleidoscope.rs:4:32
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::{ExactCoverProblem, ExactCover, ExactCoverSolver};
[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: constant `GREY_RGB` is never used
[INFO] [stdout]    --> src/problems/kaleidoscope.rs:415:7
[INFO] [stdout]     |
[INFO] [stdout] 415 | const GREY_RGB: Rgb<u8> = Rgb([0x60, 0x60, 0x60]);
[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 imports: `ExactCoverRepresentable`, `ExactCoverSolver`, and `SolverStep`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     ExactCoverSolver, ExactCoverRepresentable, SolverStep
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `exact_cover_solver::NQueens`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use exact_cover_solver::NQueens;
[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: unused import: `ExactCover`
[INFO] [stdout]  --> src/problems/kaleidoscope.rs:4:32
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::{ExactCoverProblem, ExactCover, ExactCoverSolver};
[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: constant `GREY_RGB` is never used
[INFO] [stdout]    --> src/problems/kaleidoscope.rs:415:7
[INFO] [stdout]     |
[INFO] [stdout] 415 | const GREY_RGB: Rgb<u8> = Rgb([0x60, 0x60, 0x60]);
[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 1.92s
[INFO] running `Command { std: "docker" "inspect" "fdada8d7fc59550fd79b8c409762b46e0d870d9ba0f0cfb44c28651d63b71240", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fdada8d7fc59550fd79b8c409762b46e0d870d9ba0f0cfb44c28651d63b71240", kill_on_drop: false }`
[INFO] [stdout] fdada8d7fc59550fd79b8c409762b46e0d870d9ba0f0cfb44c28651d63b71240
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+f9988fefd3add01f414f52b414308e7872622fee" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 0c923bbd0a54645c542f4b091d167aa4a03b40f941a02db1ad6eef947ce46039
[INFO] running `Command { std: "docker" "start" "-a" "0c923bbd0a54645c542f4b091d167aa4a03b40f941a02db1ad6eef947ce46039", 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: unused import: `ExactCover`
[INFO] [stderr]  --> src/problems/kaleidoscope.rs:4:32
[INFO] [stderr]   |
[INFO] [stderr] 4 | use crate::{ExactCoverProblem, ExactCover, ExactCoverSolver};
[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: constant `GREY_RGB` is never used
[INFO] [stderr]    --> src/problems/kaleidoscope.rs:415:7
[INFO] [stderr]     |
[INFO] [stderr] 415 | const GREY_RGB: Rgb<u8> = Rgb([0x60, 0x60, 0x60]);
[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: `exact_cover_solver` (lib) generated 17 warnings (run `cargo fix --lib -p exact_cover_solver` to apply 8 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 imports: `ExactCoverRepresentable`, `ExactCoverSolver`, and `SolverStep`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     ExactCoverSolver, ExactCoverRepresentable, SolverStep
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `exact_cover_solver::NQueens`
[INFO] [stderr]   --> src/main.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use exact_cover_solver::NQueens;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `exact_cover_solver` (bin "exact_cover_solver" test) generated 6 warnings (run `cargo fix --bin "exact_cover_solver" -p exact_cover_solver --tests` to apply 6 suggestions)
[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 test) generated 17 warnings (15 duplicates) (run `cargo fix --lib -p exact_cover_solver --tests` to apply 2 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.17s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/exact_cover_solver-cc154fd0322778d9)
[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_1_equal_to_brute_force ... ok
[INFO] [stdout] test problems::n_queens::test::n_queens_3_equal_to_brute_force ... 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_2_equal_to_brute_force ... ok
[INFO] [stdout] test solver::problem::test::test_ordered_points_rows ... ok
[INFO] [stdout] test solver::tests::cases::check_solutions_knuth_simple ... ok
[INFO] [stdout] test solver::tests::cases::check_solutions_zero_by_zero ... ok
[INFO] [stdout] test solver::tests::cases::check_solutions_zero_rows_three_cols ... 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] [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' (28) panicked at src/solver/problem.rs:79:9:
[INFO] [stdout] attempt to subtract with overflow
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x5a5ed420bdfa - std[1209cfb42f6d497f]::backtrace_rs::backtrace::libunwind::trace
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x5a5ed420bdfa - std[1209cfb42f6d497f]::backtrace_rs::backtrace::trace_unsynchronized::<std[1209cfb42f6d497f]::sys::backtrace::_print_fmt::{closure#1}>
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x5a5ed420bdfa - std[1209cfb42f6d497f]::sys::backtrace::_print_fmt
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/sys/backtrace.rs:74:9
[INFO] [stdout]    3:     0x5a5ed420bdfa - <<std[1209cfb42f6d497f]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[4a92201981c6b77a]::fmt::Display>::fmt
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/sys/backtrace.rs:44:26
[INFO] [stdout]    4:     0x5a5ed421fc1a - <core[4a92201981c6b77a]::fmt::rt::Argument>::fmt
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/core/src/fmt/rt.rs:152:76
[INFO] [stdout]    5:     0x5a5ed421fc1a - core[4a92201981c6b77a]::fmt::write
[INFO] [stdout]    6:     0x5a5ed4210632 - std[1209cfb42f6d497f]::io::default_write_fmt::<alloc[420bb310a727dfd7]::vec::Vec<u8>>
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/io/mod.rs:621:11
[INFO] [stdout]    7:     0x5a5ed4210632 - <alloc[420bb310a727dfd7]::vec::Vec<u8> as std[1209cfb42f6d497f]::io::Write>::write_fmt
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/io/mod.rs:1976:13
[INFO] [stdout]    8:     0x5a5ed41eadff - <std[1209cfb42f6d497f]::sys::backtrace::BacktraceLock>::print
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/sys/backtrace.rs:47:9
[INFO] [stdout]    9:     0x5a5ed41eadff - std[1209cfb42f6d497f]::panicking::default_hook::{closure#0}
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/panicking.rs:292:27
[INFO] [stdout]   10:     0x5a5ed4204259 - std[1209cfb42f6d497f]::panicking::default_hook
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/panicking.rs:316:9
[INFO] [stdout]   11:     0x5a5ed41991ec - <alloc[420bb310a727dfd7]::boxed::Box<dyn for<'a, 'b> core[4a92201981c6b77a]::ops::function::Fn<(&'a std[1209cfb42f6d497f]::panic::PanicHookInfo<'b>,), Output = ()> + core[4a92201981c6b77a]::marker::Sync + core[4a92201981c6b77a]::marker::Send> as core[4a92201981c6b77a]::ops::function::Fn<(&std[1209cfb42f6d497f]::panic::PanicHookInfo,)>>::call
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/alloc/src/boxed.rs:2285:9
[INFO] [stdout]   12:     0x5a5ed41991ec - test[59e67a9bc0e119f1]::test_main_inner::<test[59e67a9bc0e119f1]::test_main_static::{closure#0}>::{closure#0}
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/test/src/lib.rs:155:21
[INFO] [stdout]   13:     0x5a5ed4204412 - <alloc[420bb310a727dfd7]::boxed::Box<dyn for<'a, 'b> core[4a92201981c6b77a]::ops::function::Fn<(&'a std[1209cfb42f6d497f]::panic::PanicHookInfo<'b>,), Output = ()> + core[4a92201981c6b77a]::marker::Sync + core[4a92201981c6b77a]::marker::Send> as core[4a92201981c6b77a]::ops::function::Fn<(&std[1209cfb42f6d497f]::panic::PanicHookInfo,)>>::call
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/alloc/src/boxed.rs:2285:9
[INFO] [stdout]   14:     0x5a5ed4204412 - std[1209cfb42f6d497f]::panicking::panic_with_hook
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/panicking.rs:833:13
[INFO] [stdout]   15:     0x5a5ed41eaeea - std[1209cfb42f6d497f]::panicking::panic_handler::{closure#0}
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/panicking.rs:691:13
[INFO] [stdout]   16:     0x5a5ed41e00c9 - std[1209cfb42f6d497f]::sys::backtrace::__rust_end_short_backtrace::<std[1209cfb42f6d497f]::panicking::panic_handler::{closure#0}, !>
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/sys/backtrace.rs:182:18
[INFO] [stdout]   17:     0x5a5ed41ebbcd - __rustc[4effac393e9f3da6]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/panicking.rs:689:5
[INFO] [stdout]   18:     0x5a5ed422036c - core[4a92201981c6b77a]::panicking::panic_fmt
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/core/src/panicking.rs:80:14
[INFO] [stdout]   19:     0x5a5ed4221249 - core[4a92201981c6b77a]::panicking::panic_const::panic_const_sub_overflow
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/core/src/panicking.rs:175:17
[INFO] [stdout]   20:     0x5a5ed4183f51 - <exact_cover_solver[77ccf5312cf4bde4]::solver::problem::ExactCoverProblem>::primary_columns
[INFO] [stdout]                                at /opt/rustwide/workdir/src/solver/problem.rs:79:9
[INFO] [stdout]   21:     0x5a5ed41822e7 - <exact_cover_solver[77ccf5312cf4bde4]::solver::solver::ExactCoverSolver>::new
[INFO] [stdout]                                at /opt/rustwide/workdir/src/solver/solver.rs:112:36
[INFO] [stdout]   22:     0x5a5ed417e259 - <exact_cover_solver[77ccf5312cf4bde4]::solver::tests::cases::ThreeRowsZeroCols as exact_cover_solver[77ccf5312cf4bde4]::solver::tests::cases::TestCase>::assert_solution_match
[INFO] [stdout]                                at /opt/rustwide/workdir/src/solver/tests/cases.rs:17:27
[INFO] [stdout]   23:     0x5a5ed417a9fb - exact_cover_solver[77ccf5312cf4bde4]::solver::tests::cases::check_solutions_three_rows_zero_cols
[INFO] [stdout]                                at /opt/rustwide/workdir/src/solver/tests/cases.rs:117:76
[INFO] [stdout]   24:     0x5a5ed4179c47 - exact_cover_solver[77ccf5312cf4bde4]::solver::tests::cases::check_solutions_three_rows_zero_cols::{closure#0}
[INFO] [stdout]                                at /opt/rustwide/workdir/src/solver/tests/cases.rs:117:50
[INFO] [stdout]   25:     0x5a5ed417daf6 - <exact_cover_solver[77ccf5312cf4bde4]::solver::tests::cases::check_solutions_three_rows_zero_cols::{closure#0} as core[4a92201981c6b77a]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   26:     0x5a5ed418c4cb - <fn() -> core[4a92201981c6b77a]::result::Result<(), alloc[420bb310a727dfd7]::string::String> as core[4a92201981c6b77a]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   27:     0x5a5ed418c4cb - test[59e67a9bc0e119f1]::__rust_begin_short_backtrace::<core[4a92201981c6b77a]::result::Result<(), alloc[420bb310a727dfd7]::string::String>, fn() -> core[4a92201981c6b77a]::result::Result<(), alloc[420bb310a727dfd7]::string::String>>
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/test/src/lib.rs:724:18
[INFO] [stdout]   28:     0x5a5ed4199cbb - test[59e67a9bc0e119f1]::run_test_in_process::{closure#0}
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/test/src/lib.rs:747:74
[INFO] [stdout]   29:     0x5a5ed4199cbb - <core[4a92201981c6b77a]::panic::unwind_safe::AssertUnwindSafe<test[59e67a9bc0e119f1]::run_test_in_process::{closure#0}> as core[4a92201981c6b77a]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/core/src/panic/unwind_safe.rs:275:9
[INFO] [stdout]   30:     0x5a5ed4199cbb - std[1209cfb42f6d497f]::panicking::catch_unwind::do_call::<core[4a92201981c6b77a]::panic::unwind_safe::AssertUnwindSafe<test[59e67a9bc0e119f1]::run_test_in_process::{closure#0}>, core[4a92201981c6b77a]::result::Result<(), alloc[420bb310a727dfd7]::string::String>>
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/panicking.rs:581:40
[INFO] [stdout]   31:     0x5a5ed4199cbb - std[1209cfb42f6d497f]::panicking::catch_unwind::<core[4a92201981c6b77a]::result::Result<(), alloc[420bb310a727dfd7]::string::String>, core[4a92201981c6b77a]::panic::unwind_safe::AssertUnwindSafe<test[59e67a9bc0e119f1]::run_test_in_process::{closure#0}>>
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/panicking.rs:544:19
[INFO] [stdout]   32:     0x5a5ed4199cbb - std[1209cfb42f6d497f]::panic::catch_unwind::<core[4a92201981c6b77a]::panic::unwind_safe::AssertUnwindSafe<test[59e67a9bc0e119f1]::run_test_in_process::{closure#0}>, core[4a92201981c6b77a]::result::Result<(), alloc[420bb310a727dfd7]::string::String>>
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/panic.rs:359:14
[INFO] [stdout]   33:     0x5a5ed4199cbb - test[59e67a9bc0e119f1]::run_test_in_process
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/test/src/lib.rs:747:27
[INFO] [stdout]   34:     0x5a5ed4199cbb - test[59e67a9bc0e119f1]::run_test::{closure#0}
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/test/src/lib.rs:668:43
[INFO] [stdout]   35:     0x5a5ed41933d4 - test[59e67a9bc0e119f1]::run_test::{closure#1}
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/test/src/lib.rs:698:41
[INFO] [stdout]   36:     0x5a5ed41933d4 - std[1209cfb42f6d497f]::sys::backtrace::__rust_begin_short_backtrace::<test[59e67a9bc0e119f1]::run_test::{closure#1}, ()>
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/sys/backtrace.rs:166:18
[INFO] [stdout]   37:     0x5a5ed419c8c2 - std[1209cfb42f6d497f]::thread::lifecycle::spawn_unchecked::<test[59e67a9bc0e119f1]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/thread/lifecycle.rs:70:13
[INFO] [stdout]   38:     0x5a5ed419c8c2 - <core[4a92201981c6b77a]::panic::unwind_safe::AssertUnwindSafe<std[1209cfb42f6d497f]::thread::lifecycle::spawn_unchecked<test[59e67a9bc0e119f1]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}> as core[4a92201981c6b77a]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/core/src/panic/unwind_safe.rs:275:9
[INFO] [stdout]   39:     0x5a5ed419c8c2 - std[1209cfb42f6d497f]::panicking::catch_unwind::do_call::<core[4a92201981c6b77a]::panic::unwind_safe::AssertUnwindSafe<std[1209cfb42f6d497f]::thread::lifecycle::spawn_unchecked<test[59e67a9bc0e119f1]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/panicking.rs:581:40
[INFO] [stdout]   40:     0x5a5ed419c8c2 - std[1209cfb42f6d497f]::panicking::catch_unwind::<(), core[4a92201981c6b77a]::panic::unwind_safe::AssertUnwindSafe<std[1209cfb42f6d497f]::thread::lifecycle::spawn_unchecked<test[59e67a9bc0e119f1]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>>
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/panicking.rs:544:19
[INFO] [stdout]   41:     0x5a5ed419c8c2 - std[1209cfb42f6d497f]::panic::catch_unwind::<core[4a92201981c6b77a]::panic::unwind_safe::AssertUnwindSafe<std[1209cfb42f6d497f]::thread::lifecycle::spawn_unchecked<test[59e67a9bc0e119f1]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/panic.rs:359:14
[INFO] [stdout]   42:     0x5a5ed419c8c2 - std[1209cfb42f6d497f]::thread::lifecycle::spawn_unchecked::<test[59e67a9bc0e119f1]::run_test::{closure#1}, ()>::{closure#1}
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/thread/lifecycle.rs:68:26
[INFO] [stdout]   43:     0x5a5ed419c8c2 - <std[1209cfb42f6d497f]::thread::lifecycle::spawn_unchecked<test[59e67a9bc0e119f1]::run_test::{closure#1}, ()>::{closure#1} as core[4a92201981c6b77a]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   44:     0x5a5ed420b70f - <alloc[420bb310a727dfd7]::boxed::Box<dyn core[4a92201981c6b77a]::ops::function::FnOnce<(), Output = ()> + core[4a92201981c6b77a]::marker::Send> as core[4a92201981c6b77a]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/alloc/src/boxed.rs:2271:9
[INFO] [stdout]   45:     0x5a5ed420b70f - <std[1209cfb42f6d497f]::sys::thread::unix::Thread>::new::thread_start
[INFO] [stdout]                                at /rustc/f9988fefd3add01f414f52b414308e7872622fee/library/std/src/sys/thread/unix.rs:118:17
[INFO] [stdout]   46:     0x723faecd5aa4 - <unknown>
[INFO] [stdout]   47:     0x723faed62a64 - 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 0.70s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass `--lib`
[INFO] running `Command { std: "docker" "inspect" "0c923bbd0a54645c542f4b091d167aa4a03b40f941a02db1ad6eef947ce46039", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c923bbd0a54645c542f4b091d167aa4a03b40f941a02db1ad6eef947ce46039", kill_on_drop: false }`
[INFO] [stdout] 0c923bbd0a54645c542f4b091d167aa4a03b40f941a02db1ad6eef947ce46039
