[INFO] cloning repository https://github.com/mylesmegyesi/tic-tac-toe-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mylesmegyesi/tic-tac-toe-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmylesmegyesi%2Ftic-tac-toe-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmylesmegyesi%2Ftic-tac-toe-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 41a5375fab35295be839def6bb1d1a6fc521686e
[INFO] checking mylesmegyesi/tic-tac-toe-rust against try#8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8 for pr-82565
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmylesmegyesi%2Ftic-tac-toe-rust" "/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/mylesmegyesi/tic-tac-toe-rust on toolchain 8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mylesmegyesi/tic-tac-toe-rust
[INFO] finished tweaking git repo https://github.com/mylesmegyesi/tic-tac-toe-rust
[INFO] tweaked toml for git repo https://github.com/mylesmegyesi/tic-tac-toe-rust written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/mylesmegyesi/tic-tac-toe-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "fetch" "--locked" "--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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 261403a5fa5cda2197930710d321185b59d9bbe4a43339eef2bc99c4ccc4c29f
[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" "261403a5fa5cda2197930710d321185b59d9bbe4a43339eef2bc99c4ccc4c29f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "261403a5fa5cda2197930710d321185b59d9bbe4a43339eef2bc99c4ccc4c29f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "261403a5fa5cda2197930710d321185b59d9bbe4a43339eef2bc99c4ccc4c29f", kill_on_drop: false }`
[INFO] [stdout] 261403a5fa5cda2197930710d321185b59d9bbe4a43339eef2bc99c4ccc4c29f
[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=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:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cccc33dbabe905b7c55121b6b40cff7e90ef2ed18394db1ca36d0605b48d9a9a
[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" "cccc33dbabe905b7c55121b6b40cff7e90ef2ed18394db1ca36d0605b48d9a9a", kill_on_drop: false }`
[INFO] [stderr]     Checking tic-tac-toe-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/board.rs:12:25
[INFO] [stdout]    |
[INFO] [stdout] 12 |     occupant: Option<Rc<Player>>,
[INFO] [stdout]    |                         ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/board.rs:25:45
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn get_occupant(&self) -> Option<Rc<Player>> {
[INFO] [stdout]    |                                             ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/board.rs:78:44
[INFO] [stdout]    |
[INFO] [stdout] 78 |     pub fn occupy_cell(&self, occupant: Rc<Player>, reference: &CellReference) -> Self {
[INFO] [stdout]    |                                            ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/board.rs:90:38
[INFO] [stdout]    |
[INFO] [stdout] 90 |     pub fn with_board(player_one: Rc<Player>, player_two: Rc<Player>, board_string: &str) -> Self {
[INFO] [stdout]    |                                      ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/board.rs:90:62
[INFO] [stdout]    |
[INFO] [stdout] 90 |     pub fn with_board(player_one: Rc<Player>, player_two: Rc<Player>, board_string: &str) -> Self {
[INFO] [stdout]    |                                                              ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/rules.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 |     Win(Rc<Player>),
[INFO] [stdout]   |            ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/rules.rs:40:58
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn get_segment_winner(segment: &Vec<&Cell>) -> Option<Rc<Player>> {
[INFO] [stdout]    |                                                          ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/player.rs:7:49
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn get_move<'board>(&self, other_player: Rc<Player>, board: &'board Board) -> &'board CellReference;
[INFO] [stdout]   |                                                 ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/player.rs:8:30
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fn to_boxed(self) -> Box<Player>;
[INFO] [stdout]   |                              ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/player.rs:11:20
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl PartialEq for Player {
[INFO] [stdout]    |                    ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/mock_player.rs:27:38
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn get_move<'board>(&self, _: Rc<Player>, board: &'board Board) -> &'board CellReference {
[INFO] [stdout]    |                                      ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/mock_player.rs:37:30
[INFO] [stdout]    |
[INFO] [stdout] 37 |     fn to_boxed(self) -> Box<Player> {
[INFO] [stdout]    |                              ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lib.rs:13:39
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn play_game<'players>(player_one: Rc<Player>, player_two: Rc<Player>) -> GameState {
[INFO] [stdout]    |                                       ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lib.rs:13:63
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn play_game<'players>(player_one: Rc<Player>, player_two: Rc<Player>) -> GameState {
[INFO] [stdout]    |                                                               ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/board.rs:12:25
[INFO] [stdout]    |
[INFO] [stdout] 12 |     occupant: Option<Rc<Player>>,
[INFO] [stdout]    |                         ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/board.rs:25:45
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn get_occupant(&self) -> Option<Rc<Player>> {
[INFO] [stdout]    |                                             ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/board.rs:78:44
[INFO] [stdout]    |
[INFO] [stdout] 78 |     pub fn occupy_cell(&self, occupant: Rc<Player>, reference: &CellReference) -> Self {
[INFO] [stdout]    |                                            ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/rules.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 |     Win(Rc<Player>),
[INFO] [stdout]   |            ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/rules.rs:40:58
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn get_segment_winner(segment: &Vec<&Cell>) -> Option<Rc<Player>> {
[INFO] [stdout]    |                                                          ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/player.rs:7:49
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn get_move<'board>(&self, other_player: Rc<Player>, board: &'board Board) -> &'board CellReference;
[INFO] [stdout]   |                                                 ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/player.rs:8:30
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fn to_boxed(self) -> Box<Player>;
[INFO] [stdout]   |                              ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/player.rs:11:20
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl PartialEq for Player {
[INFO] [stdout]    |                    ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lib.rs:13:39
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn play_game<'players>(player_one: Rc<Player>, player_two: Rc<Player>) -> GameState {
[INFO] [stdout]    |                                       ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lib.rs:13:63
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn play_game<'players>(player_one: Rc<Player>, player_two: Rc<Player>) -> GameState {
[INFO] [stdout]    |                                                               ^^^^^^ help: use `dyn`: `dyn Player`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Board`
[INFO] [stdout]  --> src/board.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub struct Board {
[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: `get_marker`
[INFO] [stdout]   --> src/board.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 16 |     pub fn get_marker(&self) -> Option<String> {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_reference`
[INFO] [stdout]   --> src/board.rs:21:12
[INFO] [stdout]    |
[INFO] [stdout] 21 |     pub fn get_reference(&self) -> &CellReference {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_occupant`
[INFO] [stdout]   --> src/board.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn get_occupant(&self) -> Option<Rc<Player>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `empty_board`
[INFO] [stdout]   --> src/board.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 34 |     pub fn empty_board() -> Board {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `empty_cells`
[INFO] [stdout]   --> src/board.rs:45:12
[INFO] [stdout]    |
[INFO] [stdout] 45 |     pub fn empty_cells(&self) -> Vec<&CellReference> {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `cells`
[INFO] [stdout]   --> src/board.rs:52:12
[INFO] [stdout]    |
[INFO] [stdout] 52 |     pub fn cells(&self) -> impl Iterator<Item=&Cell> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `segments`
[INFO] [stdout]   --> src/board.rs:56:12
[INFO] [stdout]    |
[INFO] [stdout] 56 |     pub fn segments(&self) -> Vec<Vec<&Cell>> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `occupy_cell`
[INFO] [stdout]   --> src/board.rs:78:12
[INFO] [stdout]    |
[INFO] [stdout] 78 |     pub fn occupy_cell(&self, occupant: Rc<Player>, reference: &CellReference) -> Self {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Pending`
[INFO] [stdout]  --> src/rules.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     Pending,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Draw`
[INFO] [stdout]  --> src/rules.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     Draw,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Win`
[INFO] [stdout]  --> src/rules.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     Win(Rc<Player>),
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `analyze_game_state`
[INFO] [stdout]   --> src/rules.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub fn analyze_game_state(board: &Board) -> GameState {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_segment_winner`
[INFO] [stdout]   --> src/rules.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn get_segment_winner(segment: &Vec<&Cell>) -> Option<Rc<Player>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `play_game`
[INFO] [stdout]   --> src/lib.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn play_game<'players>(player_one: Rc<Player>, player_two: Rc<Player>) -> GameState {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `empty_cell_indices`
[INFO] [stdout]    --> src/board.rs:124:8
[INFO] [stdout]     |
[INFO] [stdout] 124 |     fn empty_cell_indices(board: &Board) -> Vec<usize> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/board.rs:81:9
[INFO] [stdout]    |
[INFO] [stdout] 81 |         std::mem::replace(&mut cells[index], Cell { occupant: Some(occupant), reference: CellReference(index) });
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 26 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/board.rs:81:9
[INFO] [stdout]    |
[INFO] [stdout] 81 |         std::mem::replace(&mut cells[index], Cell { occupant: Some(occupant), reference: CellReference(index) });
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.43s
[INFO] running `Command { std: "docker" "inspect" "cccc33dbabe905b7c55121b6b40cff7e90ef2ed18394db1ca36d0605b48d9a9a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cccc33dbabe905b7c55121b6b40cff7e90ef2ed18394db1ca36d0605b48d9a9a", kill_on_drop: false }`
[INFO] [stdout] cccc33dbabe905b7c55121b6b40cff7e90ef2ed18394db1ca36d0605b48d9a9a