[INFO] cloning repository https://github.com/hsanzg/exact-covers
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hsanzg/exact-covers" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhsanzg%2Fexact-covers", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhsanzg%2Fexact-covers'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 006bbcea1063c9d8c39e77ccba08aaa8cc94d222
[INFO] testing hsanzg/exact-covers against try#c066bf6804adc55193b71afdff6a56922f4a8689+target=x86_64-unknown-linux-musl for musl_upgrade_1_2_5_in_2025-retry-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhsanzg%2Fexact-covers" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/hsanzg/exact-covers
[INFO] removed 0 missing examples
[INFO] finished tweaking git repo https://github.com/hsanzg/exact-covers
[INFO] tweaked toml for git repo https://github.com/hsanzg/exact-covers written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/hsanzg/exact-covers on toolchain c066bf6804adc55193b71afdff6a56922f4a8689
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c066bf6804adc55193b71afdff6a56922f4a8689" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/hsanzg/exact-covers 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" "+c066bf6804adc55193b71afdff6a56922f4a8689" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+c066bf6804adc55193b71afdff6a56922f4a8689" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ad1896547b085268038b85df21f9eb3f16b124e2d3890db88b7114b01f6931aa
[INFO] running `Command { std: "docker" "start" "-a" "ad1896547b085268038b85df21f9eb3f16b124e2d3890db88b7114b01f6931aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ad1896547b085268038b85df21f9eb3f16b124e2d3890db88b7114b01f6931aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ad1896547b085268038b85df21f9eb3f16b124e2d3890db88b7114b01f6931aa", kill_on_drop: false }`
[INFO] [stdout] ad1896547b085268038b85df21f9eb3f16b124e2d3890db88b7114b01f6931aa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+c066bf6804adc55193b71afdff6a56922f4a8689" "build" "--frozen" "--message-format=json" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] 4f9c97aed8d26c6ce15572d63152d15ffa130781b17d552977b2dbab9730fc68
[INFO] running `Command { std: "docker" "start" "-a" "4f9c97aed8d26c6ce15572d63152d15ffa130781b17d552977b2dbab9730fc68", kill_on_drop: false }`
[INFO] [stderr]    Compiling exact-covers v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `primary`
[INFO] [stdout]   --> src/dc.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn new(primary: &'i [I], secondary: &'i [I]) -> Self {
[INFO] [stdout]    |            ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_primary`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `secondary`
[INFO] [stdout]   --> src/dc.rs:14:30
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn new(primary: &'i [I], secondary: &'i [I]) -> Self {
[INFO] [stdout]    |                              ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_secondary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `primary`
[INFO] [stdout]   --> src/dc.rs:18:36
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn add_option<P, S>(&mut self, primary: P, secondary: S)
[INFO] [stdout]    |                                    ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_primary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `secondary`
[INFO] [stdout]   --> src/dc.rs:18:48
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn add_option<P, S>(&mut self, primary: P, secondary: S)
[INFO] [stdout]    |                                                ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_secondary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visit`
[INFO] [stdout]   --> src/dc.rs:26:23
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn solve<F>(self, visit: F)
[INFO] [stdout]    |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_visit`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `level`
[INFO] [stdout]   --> src/dc.rs:35:23
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn pointer(&self, level: usize) -> Option<InstIndex> {
[INFO] [stdout]    |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_level`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ix`
[INFO] [stdout]   --> src/dc.rs:43:25
[INFO] [stdout]    |
[INFO] [stdout] 43 |     fn option_of(&self, ix: InstIndex, result: &mut Vec<&'i I>) {
[INFO] [stdout]    |                         ^^ help: if this is intentional, prefix it with an underscore: `_ix`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]   --> src/dc.rs:43:40
[INFO] [stdout]    |
[INFO] [stdout] 43 |     fn option_of(&self, ix: InstIndex, result: &mut Vec<&'i I>) {
[INFO] [stdout]    |                                        ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.37s
[INFO] running `Command { std: "docker" "inspect" "4f9c97aed8d26c6ce15572d63152d15ffa130781b17d552977b2dbab9730fc68", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f9c97aed8d26c6ce15572d63152d15ffa130781b17d552977b2dbab9730fc68", kill_on_drop: false }`
[INFO] [stdout] 4f9c97aed8d26c6ce15572d63152d15ffa130781b17d552977b2dbab9730fc68
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+c066bf6804adc55193b71afdff6a56922f4a8689" "test" "--frozen" "--no-run" "--message-format=json" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] f68e0cf9449bb3bde38c9baa53a6144b159a5b87aeae1d0829be162041ed4b43
[INFO] running `Command { std: "docker" "start" "-a" "f68e0cf9449bb3bde38c9baa53a6144b159a5b87aeae1d0829be162041ed4b43", kill_on_drop: false }`
[INFO] [stderr]    Compiling smallvec v2.0.0-alpha.6
[INFO] [stdout] warning: unused variable: `primary`
[INFO] [stdout]   --> src/dc.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn new(primary: &'i [I], secondary: &'i [I]) -> Self {
[INFO] [stdout]    |            ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_primary`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `secondary`
[INFO] [stdout]   --> src/dc.rs:14:30
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn new(primary: &'i [I], secondary: &'i [I]) -> Self {
[INFO] [stdout]    |                              ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_secondary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `primary`
[INFO] [stdout]   --> src/dc.rs:18:36
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn add_option<P, S>(&mut self, primary: P, secondary: S)
[INFO] [stdout]    |                                    ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_primary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `secondary`
[INFO] [stdout]   --> src/dc.rs:18:48
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn add_option<P, S>(&mut self, primary: P, secondary: S)
[INFO] [stdout]    |                                                ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_secondary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visit`
[INFO] [stdout]   --> src/dc.rs:26:23
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn solve<F>(self, visit: F)
[INFO] [stdout]    |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_visit`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `level`
[INFO] [stdout]   --> src/dc.rs:35:23
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn pointer(&self, level: usize) -> Option<InstIndex> {
[INFO] [stdout]    |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_level`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ix`
[INFO] [stdout]   --> src/dc.rs:43:25
[INFO] [stdout]    |
[INFO] [stdout] 43 |     fn option_of(&self, ix: InstIndex, result: &mut Vec<&'i I>) {
[INFO] [stdout]    |                         ^^ help: if this is intentional, prefix it with an underscore: `_ix`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]   --> src/dc.rs:43:40
[INFO] [stdout]    |
[INFO] [stdout] 43 |     fn option_of(&self, ix: InstIndex, result: &mut Vec<&'i I>) {
[INFO] [stdout]    |                                        ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling exact-covers v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `primary`
[INFO] [stdout]   --> src/dc.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn new(primary: &'i [I], secondary: &'i [I]) -> Self {
[INFO] [stdout]    |            ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_primary`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `secondary`
[INFO] [stdout]   --> src/dc.rs:14:30
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn new(primary: &'i [I], secondary: &'i [I]) -> Self {
[INFO] [stdout]    |                              ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_secondary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `primary`
[INFO] [stdout]   --> src/dc.rs:18:36
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn add_option<P, S>(&mut self, primary: P, secondary: S)
[INFO] [stdout]    |                                    ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_primary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `secondary`
[INFO] [stdout]   --> src/dc.rs:18:48
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn add_option<P, S>(&mut self, primary: P, secondary: S)
[INFO] [stdout]    |                                                ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_secondary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `visit`
[INFO] [stdout]   --> src/dc.rs:26:23
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn solve<F>(self, visit: F)
[INFO] [stdout]    |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_visit`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `level`
[INFO] [stdout]   --> src/dc.rs:35:23
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn pointer(&self, level: usize) -> Option<InstIndex> {
[INFO] [stdout]    |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_level`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ix`
[INFO] [stdout]   --> src/dc.rs:43:25
[INFO] [stdout]    |
[INFO] [stdout] 43 |     fn option_of(&self, ix: InstIndex, result: &mut Vec<&'i I>) {
[INFO] [stdout]    |                         ^^ help: if this is intentional, prefix it with an underscore: `_ix`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]   --> src/dc.rs:43:40
[INFO] [stdout]    |
[INFO] [stdout] 43 |     fn option_of(&self, ix: InstIndex, result: &mut Vec<&'i I>) {
[INFO] [stdout]    |                                        ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.98s
[INFO] running `Command { std: "docker" "inspect" "f68e0cf9449bb3bde38c9baa53a6144b159a5b87aeae1d0829be162041ed4b43", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f68e0cf9449bb3bde38c9baa53a6144b159a5b87aeae1d0829be162041ed4b43", kill_on_drop: false }`
[INFO] [stdout] f68e0cf9449bb3bde38c9baa53a6144b159a5b87aeae1d0829be162041ed4b43
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+c066bf6804adc55193b71afdff6a56922f4a8689" "test" "--frozen" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] 8e0c0902ab59f7c2c9347320551db89a49dd146b384dd4cf27704751aa3703aa
[INFO] running `Command { std: "docker" "start" "-a" "8e0c0902ab59f7c2c9347320551db89a49dd146b384dd4cf27704751aa3703aa", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `primary`
[INFO] [stderr]   --> src/dc.rs:14:12
[INFO] [stderr]    |
[INFO] [stderr] 14 |     fn new(primary: &'i [I], secondary: &'i [I]) -> Self {
[INFO] [stderr]    |            ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_primary`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `secondary`
[INFO] [stderr]   --> src/dc.rs:14:30
[INFO] [stderr]    |
[INFO] [stderr] 14 |     fn new(primary: &'i [I], secondary: &'i [I]) -> Self {
[INFO] [stderr]    |                              ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_secondary`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `primary`
[INFO] [stderr]   --> src/dc.rs:18:36
[INFO] [stderr]    |
[INFO] [stderr] 18 |     fn add_option<P, S>(&mut self, primary: P, secondary: S)
[INFO] [stderr]    |                                    ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_primary`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `secondary`
[INFO] [stderr]   --> src/dc.rs:18:48
[INFO] [stderr]    |
[INFO] [stderr] 18 |     fn add_option<P, S>(&mut self, primary: P, secondary: S)
[INFO] [stderr]    |                                                ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_secondary`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `visit`
[INFO] [stderr]   --> src/dc.rs:26:23
[INFO] [stderr]    |
[INFO] [stderr] 26 |     fn solve<F>(self, visit: F)
[INFO] [stderr]    |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_visit`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `level`
[INFO] [stderr]   --> src/dc.rs:35:23
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn pointer(&self, level: usize) -> Option<InstIndex> {
[INFO] [stderr]    |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_level`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ix`
[INFO] [stderr]   --> src/dc.rs:43:25
[INFO] [stderr]    |
[INFO] [stderr] 43 |     fn option_of(&self, ix: InstIndex, result: &mut Vec<&'i I>) {
[INFO] [stderr]    |                         ^^ help: if this is intentional, prefix it with an underscore: `_ix`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `result`
[INFO] [stderr]   --> src/dc.rs:43:40
[INFO] [stderr]    |
[INFO] [stderr] 43 |     fn option_of(&self, ix: InstIndex, result: &mut Vec<&'i I>) {
[INFO] [stderr]    |                                        ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stderr] 
[INFO] [stderr] warning: `exact-covers` (lib) generated 8 warnings
[INFO] [stderr] warning: `exact-covers` (lib test) generated 8 warnings (8 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/x86_64-unknown-linux-musl/debug/deps/exact_covers-881c3c4415afa824)
[INFO] [stdout] 
[INFO] [stdout] running 12 tests
[INFO] [stdout] test dl::tests::new_exact_cover_with_primary_and_secondary ... ok
[INFO] [stdout] test dl::tests::find_item ... ok
[INFO] [stdout] test indices::tests::index_increment ... ok
[INFO] [stdout] test dl::tests::skips_solutions_that_do_not_intersect_a_purely_secondary_option ... ok
[INFO] [stdout] test indices::tests::index_decrement ... ok
[INFO] [stdout] test indices::tests::index_get ... ok
[INFO] [stdout] test dl::tests::new_exact_cover_without_primary_has_no_solution ... ok
[INFO] [stdout] test dl::tests::new_exact_cover_with_primary_only ... ok
[INFO] [stdout] test dl::tests::skips_solutions_with_purely_secondary_options ... ok
[INFO] [stdout] test dl::tests::toy_problem_with_colors ... ok
[INFO] [stdout] test dl::tests::solutions_intersect_item_sets_of_purely_secondary_options ... ok
[INFO] [stdout] test indices::tests::out_of_bounds_node_index - should panic ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 12 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.07s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "8e0c0902ab59f7c2c9347320551db89a49dd146b384dd4cf27704751aa3703aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8e0c0902ab59f7c2c9347320551db89a49dd146b384dd4cf27704751aa3703aa", kill_on_drop: false }`
[INFO] [stdout] 8e0c0902ab59f7c2c9347320551db89a49dd146b384dd4cf27704751aa3703aa