[INFO] cloning repository https://github.com/colbyguan/minesweeper-rust-example
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/colbyguan/minesweeper-rust-example" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcolbyguan%2Fminesweeper-rust-example", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcolbyguan%2Fminesweeper-rust-example'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8547187434ebb262f644c94dc9bf6a04197bf9d4
[INFO] testing colbyguan/minesweeper-rust-example against 1.59.0 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcolbyguan%2Fminesweeper-rust-example" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/colbyguan/minesweeper-rust-example 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/colbyguan/minesweeper-rust-example
[INFO] finished tweaking git repo https://github.com/colbyguan/minesweeper-rust-example
[INFO] tweaked toml for git repo https://github.com/colbyguan/minesweeper-rust-example written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/colbyguan/minesweeper-rust-example 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] [stdout] 902dbead3df5a72f6017f07f06ea93e883a7bdda80329022f04e2c390a8bae9a
[INFO] running `Command { std: "docker" "start" "-a" "902dbead3df5a72f6017f07f06ea93e883a7bdda80329022f04e2c390a8bae9a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "902dbead3df5a72f6017f07f06ea93e883a7bdda80329022f04e2c390a8bae9a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "902dbead3df5a72f6017f07f06ea93e883a7bdda80329022f04e2c390a8bae9a", kill_on_drop: false }`
[INFO] [stdout] 902dbead3df5a72f6017f07f06ea93e883a7bdda80329022f04e2c390a8bae9a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] 416690b2e4897242be4fdec419d469e134d997b83fd864b4a6ec04b29780f447
[INFO] running `Command { std: "docker" "start" "-a" "416690b2e4897242be4fdec419d469e134d997b83fd864b4a6ec04b29780f447", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.86
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling getrandom v0.2.2
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling smallvec v1.6.1
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling lock_api v0.4.2
[INFO] [stderr]    Compiling instant v0.1.9
[INFO] [stderr]    Compiling mio v0.7.9
[INFO] [stderr]    Compiling signal-hook-registry v1.3.0
[INFO] [stderr]    Compiling parking_lot_core v0.8.3
[INFO] [stderr]    Compiling rand_core v0.6.2
[INFO] [stderr]    Compiling signal-hook v0.1.17
[INFO] [stderr]    Compiling rand_chacha v0.3.0
[INFO] [stderr]    Compiling parking_lot v0.11.1
[INFO] [stderr]    Compiling rand v0.8.3
[INFO] [stderr]    Compiling crossterm v0.19.0
[INFO] [stderr]    Compiling minesweepe-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: constant is never used: `EMOJI_NUMBERS`
[INFO] [stdout]   --> src/game.rs:50:1
[INFO] [stdout]    |
[INFO] [stdout] 50 | / const EMOJI_NUMBERS: [&'static str; 9] = [
[INFO] [stdout] 51 | |     "  ",
[INFO] [stdout] 52 | |     "\u{0031}\u{FE0F}\u{20E3}",
[INFO] [stdout] 53 | |     "\u{0032}\u{FE0F}\u{20E3}",
[INFO] [stdout] ...  |
[INFO] [stdout] 59 | |     "\u{0038}\u{FE0F}\u{20E3}",
[INFO] [stdout] 60 | | ];
[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: `receive_move_via_tokens`
[INFO] [stdout]    --> src/main.rs:149:8
[INFO] [stdout]     |
[INFO] [stdout] 149 |     fn receive_move_via_tokens(&mut self) -> VictoryState {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:79:17
[INFO] [stdout]    |
[INFO] [stdout] 79 |                 disable_raw_mode();
[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: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 |         disable_raw_mode();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:131:9
[INFO] [stdout]     |
[INFO] [stdout] 131 |         enable_raw_mode();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:153:9
[INFO] [stdout]     |
[INFO] [stdout] 153 |         stdout().flush();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: structure field `debugOn` should have a snake case name
[INFO] [stdout]  --> src/config.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     pub debugOn: bool,
[INFO] [stdout]   |         ^^^^^^^ help: convert the identifier to snake case: `debug_on`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/game.rs:131:9
[INFO] [stdout]     |
[INFO] [stdout] 131 |         execute!(stdout(), Print(s));
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `execute` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 17s
[INFO] running `Command { std: "docker" "inspect" "416690b2e4897242be4fdec419d469e134d997b83fd864b4a6ec04b29780f447", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "416690b2e4897242be4fdec419d469e134d997b83fd864b4a6ec04b29780f447", kill_on_drop: false }`
[INFO] [stdout] 416690b2e4897242be4fdec419d469e134d997b83fd864b4a6ec04b29780f447
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] ec3a405f30ed38a816e3e5ed0eedeed4f65228438ed1d3ae4885f80aeeb13cd8
[INFO] running `Command { std: "docker" "start" "-a" "ec3a405f30ed38a816e3e5ed0eedeed4f65228438ed1d3ae4885f80aeeb13cd8", kill_on_drop: false }`
[INFO] [stderr]    Compiling minesweepe-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: constant is never used: `EMOJI_NUMBERS`
[INFO] [stdout]   --> src/game.rs:50:1
[INFO] [stdout]    |
[INFO] [stdout] 50 | / const EMOJI_NUMBERS: [&'static str; 9] = [
[INFO] [stdout] 51 | |     "  ",
[INFO] [stdout] 52 | |     "\u{0031}\u{FE0F}\u{20E3}",
[INFO] [stdout] 53 | |     "\u{0032}\u{FE0F}\u{20E3}",
[INFO] [stdout] ...  |
[INFO] [stdout] 59 | |     "\u{0038}\u{FE0F}\u{20E3}",
[INFO] [stdout] 60 | | ];
[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: `receive_move_via_tokens`
[INFO] [stdout]    --> src/main.rs:149:8
[INFO] [stdout]     |
[INFO] [stdout] 149 |     fn receive_move_via_tokens(&mut self) -> VictoryState {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:79:17
[INFO] [stdout]    |
[INFO] [stdout] 79 |                 disable_raw_mode();
[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: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 |         disable_raw_mode();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:131:9
[INFO] [stdout]     |
[INFO] [stdout] 131 |         enable_raw_mode();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:153:9
[INFO] [stdout]     |
[INFO] [stdout] 153 |         stdout().flush();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: structure field `debugOn` should have a snake case name
[INFO] [stdout]  --> src/config.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     pub debugOn: bool,
[INFO] [stdout]   |         ^^^^^^^ help: convert the identifier to snake case: `debug_on`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/game.rs:131:9
[INFO] [stdout]     |
[INFO] [stdout] 131 |         execute!(stdout(), Print(s));
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `execute` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.81s
[INFO] running `Command { std: "docker" "inspect" "ec3a405f30ed38a816e3e5ed0eedeed4f65228438ed1d3ae4885f80aeeb13cd8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ec3a405f30ed38a816e3e5ed0eedeed4f65228438ed1d3ae4885f80aeeb13cd8", kill_on_drop: false }`
[INFO] [stdout] ec3a405f30ed38a816e3e5ed0eedeed4f65228438ed1d3ae4885f80aeeb13cd8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] 9af873e0a5131480277dbb7265e65a843579a978e4f39a265e18b9ca7d31abd7
[INFO] running `Command { std: "docker" "start" "-a" "9af873e0a5131480277dbb7265e65a843579a978e4f39a265e18b9ca7d31abd7", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: constant is never used: `EMOJI_NUMBERS`
[INFO] [stderr]   --> src/game.rs:50:1
[INFO] [stderr]    |
[INFO] [stderr] 50 | / const EMOJI_NUMBERS: [&'static str; 9] = [
[INFO] [stderr] 51 | |     "  ",
[INFO] [stderr] 52 | |     "\u{0031}\u{FE0F}\u{20E3}",
[INFO] [stderr] 53 | |     "\u{0032}\u{FE0F}\u{20E3}",
[INFO] [stderr] ...  |
[INFO] [stderr] 59 | |     "\u{0038}\u{FE0F}\u{20E3}",
[INFO] [stderr] 60 | | ];
[INFO] [stderr]    | |__^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `receive_move_via_tokens`
[INFO] [stderr]    --> src/main.rs:149:8
[INFO] [stderr]     |
[INFO] [stderr] 149 |     fn receive_move_via_tokens(&mut self) -> VictoryState {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/main.rs:79:17
[INFO] [stderr]    |
[INFO] [stderr] 79 |                 disable_raw_mode();
[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: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:126:9
[INFO] [stderr]     |
[INFO] [stderr] 126 |         disable_raw_mode();
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:131:9
[INFO] [stderr]     |
[INFO] [stderr] 131 |         enable_raw_mode();
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:153:9
[INFO] [stderr]     |
[INFO] [stderr] 153 |         stdout().flush();
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: structure field `debugOn` should have a snake case name
[INFO] [stderr]  --> src/config.rs:5:9
[INFO] [stderr]   |
[INFO] [stderr] 5 |     pub debugOn: bool,
[INFO] [stderr]   |         ^^^^^^^ help: convert the identifier to snake case: `debug_on`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/game.rs:131:9
[INFO] [stderr]     |
[INFO] [stderr] 131 |         execute!(stdout(), Print(s));
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in the macro `execute` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: `minesweepe-rs` (bin "minesweepe-rs" test) generated 8 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.26s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/minesweepe_rs-1d3a260b8294071d)
[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" "9af873e0a5131480277dbb7265e65a843579a978e4f39a265e18b9ca7d31abd7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9af873e0a5131480277dbb7265e65a843579a978e4f39a265e18b9ca7d31abd7", kill_on_drop: false }`
[INFO] [stdout] 9af873e0a5131480277dbb7265e65a843579a978e4f39a265e18b9ca7d31abd7