[INFO] cloning repository https://github.com/artran/rudoku
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/artran/rudoku" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fartran%2Frudoku", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fartran%2Frudoku'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5c112775cdf80d3859ea4ce81dc1eb4c735473a5
[INFO] testing artran/rudoku against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fartran%2Frudoku" "/workspace/builds/worker-105/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-105/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/artran/rudoku 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/artran/rudoku
[INFO] finished tweaking git repo https://github.com/artran/rudoku
[INFO] tweaked toml for git repo https://github.com/artran/rudoku written to /workspace/builds/worker-105/source/Cargo.toml
[INFO] crate git repo https://github.com/artran/rudoku 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded spectral v0.6.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/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] [stdout] da3298888d703f7409dfe758248ac4846cf07c8938b12cc5ecb4cc4dbe017976
[INFO] running `Command { std: "docker" "start" "-a" "da3298888d703f7409dfe758248ac4846cf07c8938b12cc5ecb4cc4dbe017976", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "da3298888d703f7409dfe758248ac4846cf07c8938b12cc5ecb4cc4dbe017976", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "da3298888d703f7409dfe758248ac4846cf07c8938b12cc5ecb4cc4dbe017976", kill_on_drop: false }`
[INFO] [stdout] da3298888d703f7409dfe758248ac4846cf07c8938b12cc5ecb4cc4dbe017976
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/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] [stdout] 69a767b7ccd81bd90d2966e402045338bf3ecf4ca9e2a61b0389dad159ec620c
[INFO] running `Command { std: "docker" "start" "-a" "69a767b7ccd81bd90d2966e402045338bf3ecf4ca9e2a61b0389dad159ec620c", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling itertools v0.10.0
[INFO] [stderr]    Compiling sudoku v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/board.rs:68:9
[INFO] [stdout]    |
[INFO] [stdout] 68 |         &mut self.cols[col_idx - 1].remove(&value);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/board.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |         &mut self.rows[row_idx - 1].remove(&value);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/board.rs:70:9
[INFO] [stdout]    |
[INFO] [stdout] 70 |         &mut self.squares[(col_idx - 1) / 3 + 3 * ((row_idx - 1) / 3)].remove(&value);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2m 02s
[INFO] running `Command { std: "docker" "inspect" "69a767b7ccd81bd90d2966e402045338bf3ecf4ca9e2a61b0389dad159ec620c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69a767b7ccd81bd90d2966e402045338bf3ecf4ca9e2a61b0389dad159ec620c", kill_on_drop: false }`
[INFO] [stdout] 69a767b7ccd81bd90d2966e402045338bf3ecf4ca9e2a61b0389dad159ec620c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/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] d36e009f7c294d563bdb1a9e3b2ea3ea9be6bcb9cd78ba48221e699bd55f48d2
[INFO] running `Command { std: "docker" "start" "-a" "d36e009f7c294d563bdb1a9e3b2ea3ea9be6bcb9cd78ba48221e699bd55f48d2", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling libc v0.2.94
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling num-complex v0.1.43
[INFO] [stderr]    Compiling num-bigint v0.1.44
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling num v0.1.42
[INFO] [stderr]    Compiling spectral v0.6.0
[INFO] [stderr]    Compiling sudoku v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/board.rs:68:9
[INFO] [stdout]    |
[INFO] [stdout] 68 |         &mut self.cols[col_idx - 1].remove(&value);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/board.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |         &mut self.rows[row_idx - 1].remove(&value);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/board.rs:70:9
[INFO] [stdout]    |
[INFO] [stdout] 70 |         &mut self.squares[(col_idx - 1) / 3 + 3 * ((row_idx - 1) / 3)].remove(&value);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 6.98s
[INFO] running `Command { std: "docker" "inspect" "d36e009f7c294d563bdb1a9e3b2ea3ea9be6bcb9cd78ba48221e699bd55f48d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d36e009f7c294d563bdb1a9e3b2ea3ea9be6bcb9cd78ba48221e699bd55f48d2", kill_on_drop: false }`
[INFO] [stdout] d36e009f7c294d563bdb1a9e3b2ea3ea9be6bcb9cd78ba48221e699bd55f48d2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-105/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] 9f969332b4585d2f9186cadc2d23430b76a2b3a8a2f2784c35891bde4e4f9ee3
[INFO] running `Command { std: "docker" "start" "-a" "9f969332b4585d2f9186cadc2d23430b76a2b3a8a2f2784c35891bde4e4f9ee3", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]   --> src/board.rs:68:9
[INFO] [stderr]    |
[INFO] [stderr] 68 |         &mut self.cols[col_idx - 1].remove(&value);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]   --> src/board.rs:69:9
[INFO] [stderr]    |
[INFO] [stderr] 69 |         &mut self.rows[row_idx - 1].remove(&value);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]   --> src/board.rs:70:9
[INFO] [stderr]    |
[INFO] [stderr] 70 |         &mut self.squares[(col_idx - 1) / 3 + 3 * ((row_idx - 1) / 3)].remove(&value);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `sudoku` (bin "sudoku" test) generated 3 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.65s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/sudoku-77928f02eb1d0a2b)
[INFO] [stdout] 
[INFO] [stdout] running 24 tests
[INFO] [stdout] test board::tests::test_clear_value_at_removes_the_value_at_a_locations_col ... ok
[INFO] [stdout] test board::tests::test_clear_value_at_removes_the_value_at_a_locations_cell ... ok
[INFO] [stdout] test board::tests::test_clear_value_at_removes_the_value_at_a_locations_square ... ok
[INFO] [stdout] test board::tests::test_clear_value_at_removes_the_value_at_a_locations_row ... ok
[INFO] [stdout] test board::tests::test_is_empty_at_return_false_if_cell_at_location_is_not_empty ... ok
[INFO] [stdout] test board::tests::test_is_empty_at_return_true_if_cell_at_location_is_empty ... ok
[INFO] [stdout] test board::tests::test_new_board_has_nine_boxes ... ok
[INFO] [stdout] test board::tests::test_new_board_has_nine_cols ... ok
[INFO] [stdout] test board::tests::test_new_board_has_nine_rows ... ok
[INFO] [stdout] test board::tests::test_setting_acceptable_value_returns_true ... ok
[INFO] [stdout] test board::tests::test_setting_acceptable_value_updates_board ... ok
[INFO] [stdout] test board::tests::test_setting_unacceptable_value_does_not_update_board ... ok
[INFO] [stdout] test board::tests::test_setting_unacceptable_value_leaves_state_unchanged ... ok
[INFO] [stdout] test board::tests::test_setting_unacceptable_value_returns_false ... ok
[INFO] [stdout] test cell_group::test::test_contains_returns_false_if_number_is_not_stored ... ok
[INFO] [stdout] test board::tests::test_the_board_can_print_itself ... ok
[INFO] [stdout] test board::tests::test_setting_value_puts_value_in_correct_groups ... ok
[INFO] [stdout] test cell_group::test::test_contains_returns_true_if_number_is_stored ... ok
[INFO] [stdout] test board::tests::test_the_board_can_be_initialised_from_a_string ... ok
[INFO] [stdout] test cell_group::test::test_insert_accepts_0_to_9 ... ok
[INFO] [stdout] test cell_group::test::test_insert_stores_digit ... ok
[INFO] [stdout] test cell_group::test::test_remove_takes_digit_out_of_cell_group ... ok
[INFO] [stdout] test board::tests::test_that_the_board_solves_sudoku ... ok
[INFO] [stdout] test cell_group::test::test_insert_rejects_values_more_than_nine - should panic ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 24 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "9f969332b4585d2f9186cadc2d23430b76a2b3a8a2f2784c35891bde4e4f9ee3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f969332b4585d2f9186cadc2d23430b76a2b3a8a2f2784c35891bde4e4f9ee3", kill_on_drop: false }`
[INFO] [stdout] 9f969332b4585d2f9186cadc2d23430b76a2b3a8a2f2784c35891bde4e4f9ee3