[INFO] cloning repository https://github.com/philmcminn/rust-sudoku
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/philmcminn/rust-sudoku" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fphilmcminn%2Frust-sudoku", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fphilmcminn%2Frust-sudoku'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e8baaaa55d6011f19725e7784062ca888901f184
[INFO] checking philmcminn/rust-sudoku against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fphilmcminn%2Frust-sudoku" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/philmcminn/rust-sudoku on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/philmcminn/rust-sudoku
[INFO] finished tweaking git repo https://github.com/philmcminn/rust-sudoku
[INFO] tweaked toml for git repo https://github.com/philmcminn/rust-sudoku written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/philmcminn/rust-sudoku already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 466d3554c87ba6d91c8fe19b870775d26c197b0471ff193157ce7f3de5c43fc4
[INFO] running `Command { std: "docker" "start" "-a" "466d3554c87ba6d91c8fe19b870775d26c197b0471ff193157ce7f3de5c43fc4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "466d3554c87ba6d91c8fe19b870775d26c197b0471ff193157ce7f3de5c43fc4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "466d3554c87ba6d91c8fe19b870775d26c197b0471ff193157ce7f3de5c43fc4", kill_on_drop: false }`
[INFO] [stdout] 466d3554c87ba6d91c8fe19b870775d26c197b0471ff193157ce7f3de5c43fc4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f9436cff07b0971bb7b6b1b53bd7b6ea20d2e041b29f6da34a07274aced8d78e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "f9436cff07b0971bb7b6b1b53bd7b6ea20d2e041b29f6da34a07274aced8d78e", kill_on_drop: false }`
[INFO] [stderr]     Checking sudoku v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `super::DLX`
[INFO] [stdout]    --> src/dlx.rs:318:9
[INFO] [stdout]     |
[INFO] [stdout] 318 |     use super::DLX;
[INFO] [stdout]     |         ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::Sudoku`
[INFO] [stdout]    --> src/solver.rs:100:9
[INFO] [stdout]     |
[INFO] [stdout] 100 |     use super::Sudoku;
[INFO] [stdout]     |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::DLX`
[INFO] [stdout]    --> src/solver.rs:101:9
[INFO] [stdout]     |
[INFO] [stdout] 101 |     use super::DLX;
[INFO] [stdout]     |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::super::solver`
[INFO] [stdout]    --> src/solver.rs:102:9
[INFO] [stdout]     |
[INFO] [stdout] 102 |     use super::super::solver; // TODO: is there a better way to state this
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::Sudoku`
[INFO] [stdout]    --> src/sudoku.rs:245:9
[INFO] [stdout]     |
[INFO] [stdout] 245 |     use super::Sudoku;
[INFO] [stdout]     |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::DLX`
[INFO] [stdout]    --> src/solver.rs:101:9
[INFO] [stdout]     |
[INFO] [stdout] 101 |     use super::DLX;
[INFO] [stdout]     |         ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `num_cols`
[INFO] [stdout]   --> src/matrix.rs:52:12
[INFO] [stdout]    |
[INFO] [stdout] 52 |     pub fn num_cols(&self) -> usize {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `block_dimension`
[INFO] [stdout]   --> src/sudoku.rs:99:12
[INFO] [stdout]    |
[INFO] [stdout] 99 |     pub fn block_dimension(&self) -> usize {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_completed`
[INFO] [stdout]    --> src/sudoku.rs:146:12
[INFO] [stdout]     |
[INFO] [stdout] 146 |     pub fn is_completed(&self) -> bool {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `num_cols`
[INFO] [stdout]   --> src/matrix.rs:52:12
[INFO] [stdout]    |
[INFO] [stdout] 52 |     pub fn num_cols(&self) -> usize {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `block_dimension`
[INFO] [stdout]   --> src/sudoku.rs:99:12
[INFO] [stdout]    |
[INFO] [stdout] 99 |     pub fn block_dimension(&self) -> usize {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_completed`
[INFO] [stdout]    --> src/sudoku.rs:146:12
[INFO] [stdout]     |
[INFO] [stdout] 146 |     pub fn is_completed(&self) -> bool {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.13s
[INFO] running `Command { std: "docker" "inspect" "f9436cff07b0971bb7b6b1b53bd7b6ea20d2e041b29f6da34a07274aced8d78e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9436cff07b0971bb7b6b1b53bd7b6ea20d2e041b29f6da34a07274aced8d78e", kill_on_drop: false }`
[INFO] [stdout] f9436cff07b0971bb7b6b1b53bd7b6ea20d2e041b29f6da34a07274aced8d78e