[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 beta-2022-02-22 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fartran%2Frudoku" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/artran/rudoku on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "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-13/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" "+beta-2022-02-22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ccbd86e647dd0f68dbd934ed5cdb998eb7bfcd81f830460a44a31a3ef15a2d6d
[INFO] running `Command { std: "docker" "start" "-a" "ccbd86e647dd0f68dbd934ed5cdb998eb7bfcd81f830460a44a31a3ef15a2d6d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ccbd86e647dd0f68dbd934ed5cdb998eb7bfcd81f830460a44a31a3ef15a2d6d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ccbd86e647dd0f68dbd934ed5cdb998eb7bfcd81f830460a44a31a3ef15a2d6d", kill_on_drop: false }`
[INFO] [stdout] ccbd86e647dd0f68dbd934ed5cdb998eb7bfcd81f830460a44a31a3ef15a2d6d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] da12dadfd06d876ea8ebd90e766da3335282fa8766d006d9e0e7eae20f960564
[INFO] running `Command { std: "docker" "start" "-a" "da12dadfd06d876ea8ebd90e766da3335282fa8766d006d9e0e7eae20f960564", kill_on_drop: false }`
[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]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 68 |         let _ = &mut self.cols[col_idx - 1].remove(&value);
[INFO] [stdout]    |         +++++++
[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]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 69 |         let _ = &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]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 70 |         let _ = &mut self.squares[(col_idx - 1) / 3 + 3 * ((row_idx - 1) / 3)].remove(&value);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.81s
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "da12dadfd06d876ea8ebd90e766da3335282fa8766d006d9e0e7eae20f960564", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "da12dadfd06d876ea8ebd90e766da3335282fa8766d006d9e0e7eae20f960564", kill_on_drop: false }`
[INFO] [stdout] da12dadfd06d876ea8ebd90e766da3335282fa8766d006d9e0e7eae20f960564
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7288271fcc3c97b23e252ce2c063d2e2eacef2ebf1b3bafb4d25961549e80734
[INFO] running `Command { std: "docker" "start" "-a" "7288271fcc3c97b23e252ce2c063d2e2eacef2ebf1b3bafb4d25961549e80734", 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]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 68 |         let _ = &mut self.cols[col_idx - 1].remove(&value);
[INFO] [stdout]    |         +++++++
[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]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 69 |         let _ = &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]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 70 |         let _ = &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 6.66s
[INFO] running `Command { std: "docker" "inspect" "7288271fcc3c97b23e252ce2c063d2e2eacef2ebf1b3bafb4d25961549e80734", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7288271fcc3c97b23e252ce2c063d2e2eacef2ebf1b3bafb4d25961549e80734", kill_on_drop: false }`
[INFO] [stdout] 7288271fcc3c97b23e252ce2c063d2e2eacef2ebf1b3bafb4d25961549e80734
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 95048eb7d55e22b680be3e2778d9568dd414d5251d320660acb784d70a6980d3
[INFO] running `Command { std: "docker" "start" "-a" "95048eb7d55e22b680be3e2778d9568dd414d5251d320660acb784d70a6980d3", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stdout] running 24 tests
[INFO] [stderr]   --> src/board.rs:68:9
[INFO] [stderr]    |
[INFO] [stderr] 68 |         &mut self.cols[col_idx - 1].remove(&value);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 68 |         let _ = &mut self.cols[col_idx - 1].remove(&value);
[INFO] [stderr]    |         +++++++
[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]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]    |
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 69 |         let _ = &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]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]    |
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 70 |         let _ = &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 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/sudoku-5320f80968a82f56)
[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_is_empty_at_return_true_if_cell_at_location_is_empty ... 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_new_board_has_nine_cols ... ok
[INFO] [stdout] test board::tests::test_new_board_has_nine_boxes ... 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_returns_false ... 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 board::tests::test_the_board_can_be_initialised_from_a_string ... ok
[INFO] [stdout] test cell_group::test::test_contains_returns_true_if_number_is_stored ... ok
[INFO] [stdout] test cell_group::test::test_contains_returns_false_if_number_is_not_stored ... ok
[INFO] [stdout] test board::tests::test_setting_unacceptable_value_leaves_state_unchanged ... 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 0.04s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "95048eb7d55e22b680be3e2778d9568dd414d5251d320660acb784d70a6980d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "95048eb7d55e22b680be3e2778d9568dd414d5251d320660acb784d70a6980d3", kill_on_drop: false }`
[INFO] [stdout] 95048eb7d55e22b680be3e2778d9568dd414d5251d320660acb784d70a6980d3