[INFO] cloning repository https://github.com/billthemaxster/twenty_forty_eigth
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/billthemaxster/twenty_forty_eigth" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbillthemaxster%2Ftwenty_forty_eigth", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbillthemaxster%2Ftwenty_forty_eigth'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 086545286b7c37c11b2cb8f98b457addc89d8dfc
[INFO] testing billthemaxster/twenty_forty_eigth against 1.59.0 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbillthemaxster%2Ftwenty_forty_eigth" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/billthemaxster/twenty_forty_eigth on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/billthemaxster/twenty_forty_eigth
[INFO] finished tweaking git repo https://github.com/billthemaxster/twenty_forty_eigth
[INFO] tweaked toml for git repo https://github.com/billthemaxster/twenty_forty_eigth written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/billthemaxster/twenty_forty_eigth already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+1.59.0" "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] 9a9b97e5905e7fa759cc55c489911fb7d9235efa50b831dbfa24d96273ed3399
[INFO] running `Command { std: "docker" "start" "-a" "9a9b97e5905e7fa759cc55c489911fb7d9235efa50b831dbfa24d96273ed3399", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9a9b97e5905e7fa759cc55c489911fb7d9235efa50b831dbfa24d96273ed3399", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9a9b97e5905e7fa759cc55c489911fb7d9235efa50b831dbfa24d96273ed3399", kill_on_drop: false }`
[INFO] [stdout] 9a9b97e5905e7fa759cc55c489911fb7d9235efa50b831dbfa24d96273ed3399
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 802e3db2e78e5050bc090a05b1a17a58693393831816739ec3ecdfbcb276e70d
[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" "802e3db2e78e5050bc090a05b1a17a58693393831816739ec3ecdfbcb276e70d", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.76
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling twenty_forty_eight v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `get_grid`
[INFO] [stdout]   --> src/engine/game.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub fn get_grid(&self) -> &Grid {
[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: `perform_move`
[INFO] [stdout]   --> src/engine/game.rs:67:12
[INFO] [stdout]    |
[INFO] [stdout] 67 |     pub fn perform_move(&mut self, direction: MoveDirection) -> Result<(), &'static str> {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `perform_move_down`
[INFO] [stdout]   --> src/engine/game.rs:81:8
[INFO] [stdout]    |
[INFO] [stdout] 81 |     fn perform_move_down(&mut self) -> Result<Vec<Tile>, &'static str> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `perform_shunt_down`
[INFO] [stdout]   --> src/engine/game.rs:98:8
[INFO] [stdout]    |
[INFO] [stdout] 98 |     fn perform_shunt_down(&mut self, column_index: u8) -> Result<bool, &'static str> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `MoveDirection`
[INFO] [stdout]    --> src/engine/game.rs:119:10
[INFO] [stdout]     |
[INFO] [stdout] 119 | pub enum MoveDirection {
[INFO] [stdout]     |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `move_tile`
[INFO] [stdout]   --> src/engine/grid.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 |     pub fn move_tile(&mut self, current_position: GridCoord, new_position: GridCoord) -> Result<(), &'static str> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_size`
[INFO] [stdout]   --> src/engine/grid.rs:84:12
[INFO] [stdout]    |
[INFO] [stdout] 84 |     pub fn get_size(&self) -> u8{
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_equal`
[INFO] [stdout]  --> src/engine/grid_coord.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 |     pub fn is_equal(&self, other: &GridCoord) -> bool {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/engine/game.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 | /         match direction {
[INFO] [stdout] 70 | |             MoveDirection::Down => self.perform_move_down(),
[INFO] [stdout] 71 | |             _ => panic!(),
[INFO] [stdout] 72 | |         };
[INFO] [stdout]    | |__________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.27s
[INFO] running `Command { std: "docker" "inspect" "802e3db2e78e5050bc090a05b1a17a58693393831816739ec3ecdfbcb276e70d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "802e3db2e78e5050bc090a05b1a17a58693393831816739ec3ecdfbcb276e70d", kill_on_drop: false }`
[INFO] [stdout] 802e3db2e78e5050bc090a05b1a17a58693393831816739ec3ecdfbcb276e70d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+1.59.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 21b41327012ff925a1efccc3a8ce7a011e14b4ddd8a9d789fc50b23efcfa1b95
[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" "21b41327012ff925a1efccc3a8ce7a011e14b4ddd8a9d789fc50b23efcfa1b95", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]    Compiling rstest v0.6.4
[INFO] [stderr]    Compiling twenty_forty_eight v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `get_grid`
[INFO] [stdout]   --> src/engine/game.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub fn get_grid(&self) -> &Grid {
[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: `perform_move`
[INFO] [stdout]   --> src/engine/game.rs:67:12
[INFO] [stdout]    |
[INFO] [stdout] 67 |     pub fn perform_move(&mut self, direction: MoveDirection) -> Result<(), &'static str> {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `perform_move_down`
[INFO] [stdout]   --> src/engine/game.rs:81:8
[INFO] [stdout]    |
[INFO] [stdout] 81 |     fn perform_move_down(&mut self) -> Result<Vec<Tile>, &'static str> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `perform_shunt_down`
[INFO] [stdout]   --> src/engine/game.rs:98:8
[INFO] [stdout]    |
[INFO] [stdout] 98 |     fn perform_shunt_down(&mut self, column_index: u8) -> Result<bool, &'static str> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `MoveDirection`
[INFO] [stdout]    --> src/engine/game.rs:119:10
[INFO] [stdout]     |
[INFO] [stdout] 119 | pub enum MoveDirection {
[INFO] [stdout]     |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `move_tile`
[INFO] [stdout]   --> src/engine/grid.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 |     pub fn move_tile(&mut self, current_position: GridCoord, new_position: GridCoord) -> Result<(), &'static str> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/engine/game.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 | /         match direction {
[INFO] [stdout] 70 | |             MoveDirection::Down => self.perform_move_down(),
[INFO] [stdout] 71 | |             _ => panic!(),
[INFO] [stdout] 72 | |         };
[INFO] [stdout]    | |__________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 22.63s
[INFO] running `Command { std: "docker" "inspect" "21b41327012ff925a1efccc3a8ce7a011e14b4ddd8a9d789fc50b23efcfa1b95", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "21b41327012ff925a1efccc3a8ce7a011e14b4ddd8a9d789fc50b23efcfa1b95", kill_on_drop: false }`
[INFO] [stdout] 21b41327012ff925a1efccc3a8ce7a011e14b4ddd8a9d789fc50b23efcfa1b95
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+1.59.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 1af2af41853f30526be108e628e76f2325c8f00eea4daacf0f54dcfed0c67bf8
[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" "1af2af41853f30526be108e628e76f2325c8f00eea4daacf0f54dcfed0c67bf8", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: associated function is never used: `get_grid`
[INFO] [stdout] running 40 tests
[INFO] [stderr]   --> src/engine/game.rs:29:12
[INFO] [stdout] test engine::game::test::new::invalid_grid_size_requested_err_returned::case_1 ... ok
[INFO] [stderr]    |
[INFO] [stdout] test engine::game::test::new::set_tiles_to_grid_of_given_size::case_3 ... ok
[INFO] [stderr] 29 |     pub fn get_grid(&self) -> &Grid {
[INFO] [stdout] test engine::game::test::new::set_tiles_to_grid_of_given_size::case_2 ... ok
[INFO] [stderr]    |            ^^^^^^^^
[INFO] [stdout] test engine::grid::test::get_empty_positions::return_all_squares_when_grid_is_empty::case_2 ... ok
[INFO] [stderr]    |
[INFO] [stdout] test engine::grid::test::get_empty_positions::return_all_squares_when_grid_is_empty::case_3 ... ok
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] test engine::grid::test::get_empty_positions::returns_correct_squares::case_1 ... ok
[INFO] [stderr] 
[INFO] [stdout] test engine::grid::test::get_empty_positions::return_correct_number_of_squares_when_given_number_are_populated::case_2 ... ok
[INFO] [stderr] warning: associated function is never used: `perform_move`
[INFO] [stdout] test engine::grid::test::get_empty_positions::return_correct_number_of_squares_when_given_number_are_populated::case_6 ... ok
[INFO] [stderr]   --> src/engine/game.rs:67:12
[INFO] [stdout] test engine::grid::test::get_empty_positions::return_correct_number_of_squares_when_given_number_are_populated::case_5 ... ok
[INFO] [stderr]    |
[INFO] [stdout] test engine::grid::test::get_empty_positions::returns_correct_squares::case_3 ... ok
[INFO] [stderr] 67 |     pub fn perform_move(&mut self, direction: MoveDirection) -> Result<(), &'static str> {
[INFO] [stdout] test engine::grid::test::get_empty_positions::returns_correct_squares::case_2 ... ok
[INFO] [stderr]    |            ^^^^^^^^^^^^
[INFO] [stdout] test engine::grid::test::get_empty_positions::returns_correct_squares::case_5 ... ok
[INFO] [stderr] 
[INFO] [stdout] test engine::grid::test::get_empty_positions::returns_correct_squares::case_6 ... ok
[INFO] [stderr] warning: associated function is never used: `perform_move_down`
[INFO] [stdout] test engine::grid::test::get_empty_positions::return_correct_number_of_squares_when_given_number_are_populated::case_4 ... ok
[INFO] [stderr]   --> src/engine/game.rs:81:8
[INFO] [stdout] test engine::grid::test::get_tile::errors_if_position_outside_of_grid::case_1 ... ok
[INFO] [stderr]    |
[INFO] [stdout] test engine::grid::test::get_tile::returns_tile_for_valid_location ... ok
[INFO] [stderr] 81 |     fn perform_move_down(&mut self) -> Result<Vec<Tile>, &'static str> {
[INFO] [stdout] test engine::grid::test::get_tile::errors_if_position_outside_of_grid::case_2 ... ok
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] test engine::grid::test::new::error_on_an_invalid_size::case_1 ... ok
[INFO] [stderr] 
[INFO] [stdout] test engine::grid::test::get_empty_positions::return_all_squares_when_grid_is_empty::case_1 ... ok
[INFO] [stderr] warning: associated function is never used: `perform_shunt_down`
[INFO] [stdout] test engine::game::test::new::game_created_with_two_initial_tiles ... ok
[INFO] [stderr]   --> src/engine/game.rs:98:8
[INFO] [stdout] test engine::grid::test::add_new_tile::adds_a_tile_of_given_value_to_the_given_position ... ok
[INFO] [stderr]    |
[INFO] [stdout] test engine::grid::test::get_empty_positions::return_correct_number_of_squares_when_given_number_are_populated::case_1 ... ok
[INFO] [stderr] 98 |     fn perform_shunt_down(&mut self, column_index: u8) -> Result<bool, &'static str> {
[INFO] [stdout] test engine::grid::test::new::set_dimensions_of_grid_data_to_given_size::case_1 ... ok
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `MoveDirection`
[INFO] [stderr]    --> src/engine/game.rs:119:10
[INFO] [stderr]     |
[INFO] [stderr] 119 | pub enum MoveDirection {
[INFO] [stderr]     |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `move_tile`
[INFO] [stderr]   --> src/engine/grid.rs:49:12
[INFO] [stderr]    |
[INFO] [stderr] 49 |     pub fn move_tile(&mut self, current_position: GridCoord, new_position: GridCoord) -> Result<(), &'static str> {
[INFO] [stderr]    |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/engine/game.rs:69:9
[INFO] [stderr]    |
[INFO] [stderr] 69 | /         match direction {
[INFO] [stderr] 70 | |             MoveDirection::Down => self.perform_move_down(),
[INFO] [stderr] 71 | |             _ => panic!(),
[INFO] [stderr] 72 | |         };
[INFO] [stderr]    | |__________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: `twenty_forty_eight` (bin "twenty_forty_eight" test) generated 7 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/twenty_forty_eight-071d2cad3b36b0e2)
[INFO] [stdout] test engine::grid::test::new::error_on_an_invalid_size::case_2 ... ok
[INFO] [stdout] test engine::grid_coord::test::is_equal::returns_false_when_xs_are_not_equal ... ok
[INFO] [stdout] test engine::grid::test::new::set_dimensions_of_grid_data_to_given_size::case_3 ... ok
[INFO] [stdout] test engine::game::test::new::game_created_with_two_tiles_that_are_of_initial_value ... ok
[INFO] [stdout] test engine::grid::test::new::set_dimensions_of_grid_data_to_given_size::case_2 ... ok
[INFO] [stdout] test engine::grid::test::new::set_size_to_given_size::case_2 ... ok
[INFO] [stdout] test engine::grid::test::new::set_size_to_given_size::case_1 ... ok
[INFO] [stdout] test engine::game::test::new::invalid_grid_size_requested_err_returned::case_2 ... ok
[INFO] [stdout] test engine::grid::test::new::set_size_to_given_size::case_3 ... ok
[INFO] [stdout] test engine::game::test::new::set_tiles_to_grid_of_given_size::case_1 ... ok
[INFO] [stdout] test engine::grid::test::get_empty_positions::returns_correct_squares::case_4 ... ok
[INFO] [stdout] test engine::game::test::new::set_score_to_zero ... ok
[INFO] [stdout] test engine::grid::test::get_empty_positions::return_correct_number_of_squares_when_given_number_are_populated::case_3 ... ok
[INFO] [stdout] test engine::grid_coord::test::is_equal::returns_false_when_both_x_and_y_are_not_equal ... ok
[INFO] [stdout] test engine::grid_coord::test::is_equal::returns_false_when_ys_are_not_equal ... ok
[INFO] [stdout] test engine::grid::test::add_new_tile::does_not_add_a_tile_if_one_is_present_in_given_location ... ok
[INFO] [stdout] test engine::grid_coord::test::is_equal::returns_true_when_both_x_and_y_are_equal ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 40 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.03s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "1af2af41853f30526be108e628e76f2325c8f00eea4daacf0f54dcfed0c67bf8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1af2af41853f30526be108e628e76f2325c8f00eea4daacf0f54dcfed0c67bf8", kill_on_drop: false }`
[INFO] [stdout] 1af2af41853f30526be108e628e76f2325c8f00eea4daacf0f54dcfed0c67bf8