[INFO] cloning repository https://github.com/garblez/sudoku-solver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/garblez/sudoku-solver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgarblez%2Fsudoku-solver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgarblez%2Fsudoku-solver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4ea4a1821764c7148b134bca510e4f0ab37f2bd1
[INFO] testing garblez/sudoku-solver against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgarblez%2Fsudoku-solver" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/garblez/sudoku-solver on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/garblez/sudoku-solver
[INFO] finished tweaking git repo https://github.com/garblez/sudoku-solver
[INFO] tweaked toml for git repo https://github.com/garblez/sudoku-solver written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/garblez/sudoku-solver already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "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] a1afe6a7f2c5b179d47f351895ba95ccc98b52e9bbea15afe7df2160715bf84c
[INFO] running `Command { std: "docker" "start" "-a" "a1afe6a7f2c5b179d47f351895ba95ccc98b52e9bbea15afe7df2160715bf84c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a1afe6a7f2c5b179d47f351895ba95ccc98b52e9bbea15afe7df2160715bf84c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a1afe6a7f2c5b179d47f351895ba95ccc98b52e9bbea15afe7df2160715bf84c", kill_on_drop: false }`
[INFO] [stdout] a1afe6a7f2c5b179d47f351895ba95ccc98b52e9bbea15afe7df2160715bf84c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 5bcd69ec5590303492aeebb534fcd7ac1ddcc9035e7d8f8920860243edcfc931
[INFO] running `Command { std: "docker" "start" "-a" "5bcd69ec5590303492aeebb534fcd7ac1ddcc9035e7d8f8920860243edcfc931", kill_on_drop: false }`
[INFO] [stderr]    Compiling sudoku-solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `domain`
[INFO] [stdout]   --> src/main.rs:32:38
[INFO] [stdout]    |
[INFO] [stdout] 32 |                 Value::Variable{val, domain} => println!("{}", val)
[INFO] [stdout]    |                                      ^^^^^^ help: try ignoring the field: `domain: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/main.rs:45:14
[INFO] [stdout]    |
[INFO] [stdout] 45 |         for (row, line) in lines.enumerate() {
[INFO] [stdout]    |              ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `column`
[INFO] [stdout]   --> src/main.rs:48:22
[INFO] [stdout]    |
[INFO] [stdout] 48 |                 for (column, chunk) in chunks.into_iter().enumerate() {
[INFO] [stdout]    |                      ^^^^^^ help: if this is intentional, prefix it with an underscore: `_column`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `domain`
[INFO] [stdout]   --> src/main.rs:72:34
[INFO] [stdout]    |
[INFO] [stdout] 72 |             Value::Variable{val, domain} => *val
[INFO] [stdout]    |                                  ^^^^^^ help: try ignoring the field: `domain: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Status`
[INFO] [stdout]   --> src/main.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | enum Status {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Board`
[INFO] [stdout]   --> src/main.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | struct Board {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_value`
[INFO] [stdout]   --> src/main.rs:68:8
[INFO] [stdout]    |
[INFO] [stdout] 68 |     fn get_value(&self) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unique_in_row`
[INFO] [stdout]   --> src/main.rs:78:4
[INFO] [stdout]    |
[INFO] [stdout] 78 | fn unique_in_row(board: &Vec<Value>, var: &Value, row: usize) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unique_in_col`
[INFO] [stdout]   --> src/main.rs:88:4
[INFO] [stdout]    |
[INFO] [stdout] 88 | fn unique_in_col(board: &Vec<Value>, var: &Value, col: usize) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unique_in_square`
[INFO] [stdout]   --> src/main.rs:98:4
[INFO] [stdout]    |
[INFO] [stdout] 98 | fn unique_in_square(board: &Vec<Value>, var: &Value, center: (usize, usize)) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.10s
[INFO] running `Command { std: "docker" "inspect" "5bcd69ec5590303492aeebb534fcd7ac1ddcc9035e7d8f8920860243edcfc931", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5bcd69ec5590303492aeebb534fcd7ac1ddcc9035e7d8f8920860243edcfc931", kill_on_drop: false }`
[INFO] [stdout] 5bcd69ec5590303492aeebb534fcd7ac1ddcc9035e7d8f8920860243edcfc931
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f851ff405262aeffc111750c20b80988662f2454a09b51211bb2e28b8a7e8c73
[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" "f851ff405262aeffc111750c20b80988662f2454a09b51211bb2e28b8a7e8c73", kill_on_drop: false }`
[INFO] [stderr]    Compiling sudoku-solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `domain`
[INFO] [stdout]   --> src/main.rs:32:38
[INFO] [stdout]    |
[INFO] [stdout] 32 |                 Value::Variable{val, domain} => println!("{}", val)
[INFO] [stdout]    |                                      ^^^^^^ help: try ignoring the field: `domain: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/main.rs:45:14
[INFO] [stdout]    |
[INFO] [stdout] 45 |         for (row, line) in lines.enumerate() {
[INFO] [stdout]    |              ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `column`
[INFO] [stdout]   --> src/main.rs:48:22
[INFO] [stdout]    |
[INFO] [stdout] 48 |                 for (column, chunk) in chunks.into_iter().enumerate() {
[INFO] [stdout]    |                      ^^^^^^ help: if this is intentional, prefix it with an underscore: `_column`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `domain`
[INFO] [stdout]   --> src/main.rs:72:34
[INFO] [stdout]    |
[INFO] [stdout] 72 |             Value::Variable{val, domain} => *val
[INFO] [stdout]    |                                  ^^^^^^ help: try ignoring the field: `domain: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Status`
[INFO] [stdout]   --> src/main.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | enum Status {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Board`
[INFO] [stdout]   --> src/main.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | struct Board {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_value`
[INFO] [stdout]   --> src/main.rs:68:8
[INFO] [stdout]    |
[INFO] [stdout] 68 |     fn get_value(&self) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unique_in_row`
[INFO] [stdout]   --> src/main.rs:78:4
[INFO] [stdout]    |
[INFO] [stdout] 78 | fn unique_in_row(board: &Vec<Value>, var: &Value, row: usize) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unique_in_col`
[INFO] [stdout]   --> src/main.rs:88:4
[INFO] [stdout]    |
[INFO] [stdout] 88 | fn unique_in_col(board: &Vec<Value>, var: &Value, col: usize) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unique_in_square`
[INFO] [stdout]   --> src/main.rs:98:4
[INFO] [stdout]    |
[INFO] [stdout] 98 | fn unique_in_square(board: &Vec<Value>, var: &Value, center: (usize, usize)) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.58s
[INFO] running `Command { std: "docker" "inspect" "f851ff405262aeffc111750c20b80988662f2454a09b51211bb2e28b8a7e8c73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f851ff405262aeffc111750c20b80988662f2454a09b51211bb2e28b8a7e8c73", kill_on_drop: false }`
[INFO] [stdout] f851ff405262aeffc111750c20b80988662f2454a09b51211bb2e28b8a7e8c73
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 9c7e8fcf9f5de3f8dd6fcc640e06c8dd659a02ba74dd7ead56ade5b9e53274fb
[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" "9c7e8fcf9f5de3f8dd6fcc640e06c8dd659a02ba74dd7ead56ade5b9e53274fb", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `domain`
[INFO] [stderr]   --> src/main.rs:32:38
[INFO] [stderr]    |
[INFO] [stderr] 32 |                 Value::Variable{val, domain} => println!("{}", val)
[INFO] [stderr]    |                                      ^^^^^^ help: try ignoring the field: `domain: _`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `row`
[INFO] [stderr]   --> src/main.rs:45:14
[INFO] [stderr]    |
[INFO] [stderr] 45 |         for (row, line) in lines.enumerate() {
[INFO] [stderr]    |              ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `column`
[INFO] [stderr]   --> src/main.rs:48:22
[INFO] [stderr]    |
[INFO] [stderr] 48 |                 for (column, chunk) in chunks.into_iter().enumerate() {
[INFO] [stderr]    |                      ^^^^^^ help: if this is intentional, prefix it with an underscore: `_column`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `domain`
[INFO] [stderr]   --> src/main.rs:72:34
[INFO] [stderr]    |
[INFO] [stderr] 72 |             Value::Variable{val, domain} => *val
[INFO] [stderr]    |                                  ^^^^^^ help: try ignoring the field: `domain: _`
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Status`
[INFO] [stderr]   --> src/main.rs:14:6
[INFO] [stderr]    |
[INFO] [stderr] 14 | enum Status {
[INFO] [stderr]    |      ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Board`
[INFO] [stderr]   --> src/main.rs:19:8
[INFO] [stderr]    |
[INFO] [stderr] 19 | struct Board {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `get_value`
[INFO] [stderr]   --> src/main.rs:68:8
[INFO] [stderr]    |
[INFO] [stderr] 68 |     fn get_value(&self) -> u8 {
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `unique_in_row`
[INFO] [stderr]   --> src/main.rs:78:4
[INFO] [stderr]    |
[INFO] [stderr] 78 | fn unique_in_row(board: &Vec<Value>, var: &Value, row: usize) -> bool {
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `unique_in_col`
[INFO] [stderr]   --> src/main.rs:88:4
[INFO] [stderr]    |
[INFO] [stderr] 88 | fn unique_in_col(board: &Vec<Value>, var: &Value, col: usize) -> bool {
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `unique_in_square`
[INFO] [stderr]   --> src/main.rs:98:4
[INFO] [stderr]    |
[INFO] [stderr] 98 | fn unique_in_square(board: &Vec<Value>, var: &Value, center: (usize, usize)) -> bool {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `sudoku-solver` (bin "sudoku-solver" test) generated 10 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.00s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/sudoku_solver-14206c8f3fc4e8da)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "9c7e8fcf9f5de3f8dd6fcc640e06c8dd659a02ba74dd7ead56ade5b9e53274fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9c7e8fcf9f5de3f8dd6fcc640e06c8dd659a02ba74dd7ead56ade5b9e53274fb", kill_on_drop: false }`
[INFO] [stdout] 9c7e8fcf9f5de3f8dd6fcc640e06c8dd659a02ba74dd7ead56ade5b9e53274fb