[INFO] cloning repository https://github.com/Eragra3/rusty-checkers
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Eragra3/rusty-checkers" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEragra3%2Frusty-checkers", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEragra3%2Frusty-checkers'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 764bba6fe5963f8c7fdc303c659a7cec1143cf46
[INFO] testing Eragra3/rusty-checkers against try#ce59db7a1b1b012fb2793c4641c1bdecad7a128b for pr-85530
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEragra3%2Frusty-checkers" "/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/Eragra3/rusty-checkers on toolchain ce59db7a1b1b012fb2793c4641c1bdecad7a128b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Eragra3/rusty-checkers
[INFO] finished tweaking git repo https://github.com/Eragra3/rusty-checkers
[INFO] tweaked toml for git repo https://github.com/Eragra3/rusty-checkers written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/Eragra3/rusty-checkers already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded colored v1.9.0
[INFO] [stderr]   Downloaded pad v0.1.6
[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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 07c4379f0b836b05428c71db2e367ae8b2427bf210c70e5676649f083e5e9ec0
[INFO] running `Command { std: "docker" "start" "-a" "07c4379f0b836b05428c71db2e367ae8b2427bf210c70e5676649f083e5e9ec0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "07c4379f0b836b05428c71db2e367ae8b2427bf210c70e5676649f083e5e9ec0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "07c4379f0b836b05428c71db2e367ae8b2427bf210c70e5676649f083e5e9ec0", kill_on_drop: false }`
[INFO] [stdout] 07c4379f0b836b05428c71db2e367ae8b2427bf210c70e5676649f083e5e9ec0
[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=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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ecb6218c74b764d730e808a3f54a23aa4176aa38f892bbac2bcc9c712396467a
[INFO] running `Command { std: "docker" "start" "-a" "ecb6218c74b764d730e808a3f54a23aa4176aa38f892bbac2bcc9c712396467a", 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] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling unicode-width v0.1.6
[INFO] [stderr]    Compiling pad v0.1.6
[INFO] [stderr]    Compiling atty v0.2.13
[INFO] [stderr]    Compiling colored v1.9.0
[INFO] [stderr]    Compiling checkers v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant is never constructed: `BlackKing`
[INFO] [stdout]   --> src/main.rs:50:5
[INFO] [stdout]    |
[INFO] [stdout] 50 |     BlackKing,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `WhiteKing`
[INFO] [stdout]   --> src/main.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 |     WhiteKing,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_tile_owner_at`
[INFO] [stdout]    --> src/main.rs:171:12
[INFO] [stdout]     |
[INFO] [stdout] 171 |     pub fn get_tile_owner_at(&self, index: Index) -> Result<Option<Player>, &str> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `MultiCapture`
[INFO] [stdout]    --> src/main.rs:843:5
[INFO] [stdout]     |
[INFO] [stdout] 843 |     MultiCapture(Vec<Index>),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `KingMove`
[INFO] [stdout]    --> src/main.rs:844:5
[INFO] [stdout]     |
[INFO] [stdout] 844 |     KingMove(Index),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `KingCapture`
[INFO] [stdout]    --> src/main.rs:845:5
[INFO] [stdout]     |
[INFO] [stdout] 845 | /     KingCapture {
[INFO] [stdout] 846 | |         target_index: Index,
[INFO] [stdout] 847 | |         captured_index: Index,
[INFO] [stdout] 848 | |     },
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `KingMultiCapture`
[INFO] [stdout]    --> src/main.rs:849:5
[INFO] [stdout]     |
[INFO] [stdout] 849 |     KingMultiCapture(Vec<Index>),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/main.rs:338:40
[INFO] [stdout]     |
[INFO] [stdout] 338 |                     Err(msg) => panic!(msg),
[INFO] [stdout]     |                                        ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 338 |                     Err(msg) => panic!("{}", msg),
[INFO] [stdout]     |                                        ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]     |
[INFO] [stdout] 338 |                     Err(msg) => std::panic::panic_any(msg),
[INFO] [stdout]     |                                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/main.rs:688:35
[INFO] [stdout]     |
[INFO] [stdout] 688 |             Tile::Empty => panic!(INTERNAL_ERROR_MESSAGE),
[INFO] [stdout]     |                                   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 688 |             Tile::Empty => panic!("{}", INTERNAL_ERROR_MESSAGE),
[INFO] [stdout]     |                                   ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]     |
[INFO] [stdout] 688 |             Tile::Empty => std::panic::panic_any(INTERNAL_ERROR_MESSAGE),
[INFO] [stdout]     |                            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.70s
[INFO] running `Command { std: "docker" "inspect" "ecb6218c74b764d730e808a3f54a23aa4176aa38f892bbac2bcc9c712396467a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ecb6218c74b764d730e808a3f54a23aa4176aa38f892bbac2bcc9c712396467a", kill_on_drop: false }`
[INFO] [stdout] ecb6218c74b764d730e808a3f54a23aa4176aa38f892bbac2bcc9c712396467a
[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=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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d163e76f59d067d287572e57c9a3050302a023beb5fa7f28ace9f2fba370ecd3
[INFO] running `Command { std: "docker" "start" "-a" "d163e76f59d067d287572e57c9a3050302a023beb5fa7f28ace9f2fba370ecd3", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling checkers v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant is never constructed: `BlackKing`
[INFO] [stdout]   --> src/main.rs:50:5
[INFO] [stdout]    |
[INFO] [stdout] 50 |     BlackKing,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `WhiteKing`
[INFO] [stdout]   --> src/main.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 |     WhiteKing,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_tile_owner_at`
[INFO] [stdout]    --> src/main.rs:171:12
[INFO] [stdout]     |
[INFO] [stdout] 171 |     pub fn get_tile_owner_at(&self, index: Index) -> Result<Option<Player>, &str> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `MultiCapture`
[INFO] [stdout]    --> src/main.rs:843:5
[INFO] [stdout]     |
[INFO] [stdout] 843 |     MultiCapture(Vec<Index>),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `KingMove`
[INFO] [stdout]    --> src/main.rs:844:5
[INFO] [stdout]     |
[INFO] [stdout] 844 |     KingMove(Index),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `KingCapture`
[INFO] [stdout]    --> src/main.rs:845:5
[INFO] [stdout]     |
[INFO] [stdout] 845 | /     KingCapture {
[INFO] [stdout] 846 | |         target_index: Index,
[INFO] [stdout] 847 | |         captured_index: Index,
[INFO] [stdout] 848 | |     },
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `KingMultiCapture`
[INFO] [stdout]    --> src/main.rs:849:5
[INFO] [stdout]     |
[INFO] [stdout] 849 |     KingMultiCapture(Vec<Index>),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/main.rs:338:40
[INFO] [stdout]     |
[INFO] [stdout] 338 |                     Err(msg) => panic!(msg),
[INFO] [stdout]     |                                        ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 338 |                     Err(msg) => panic!("{}", msg),
[INFO] [stdout]     |                                        ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]     |
[INFO] [stdout] 338 |                     Err(msg) => std::panic::panic_any(msg),
[INFO] [stdout]     |                                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/main.rs:688:35
[INFO] [stdout]     |
[INFO] [stdout] 688 |             Tile::Empty => panic!(INTERNAL_ERROR_MESSAGE),
[INFO] [stdout]     |                                   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 688 |             Tile::Empty => panic!("{}", INTERNAL_ERROR_MESSAGE),
[INFO] [stdout]     |                                   ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]     |
[INFO] [stdout] 688 |             Tile::Empty => std::panic::panic_any(INTERNAL_ERROR_MESSAGE),
[INFO] [stdout]     |                            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.28s
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "d163e76f59d067d287572e57c9a3050302a023beb5fa7f28ace9f2fba370ecd3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d163e76f59d067d287572e57c9a3050302a023beb5fa7f28ace9f2fba370ecd3", kill_on_drop: false }`
[INFO] [stdout] d163e76f59d067d287572e57c9a3050302a023beb5fa7f28ace9f2fba370ecd3
[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=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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] afacba4c012fb69c5c081536a39eb8d3829fb7c93a48e3648913498fe84cc14c
[INFO] running `Command { std: "docker" "start" "-a" "afacba4c012fb69c5c081536a39eb8d3829fb7c93a48e3648913498fe84cc14c", kill_on_drop: false }`
[INFO] [stderr] warning: variant is never constructed: `BlackKing`
[INFO] [stderr]   --> src/main.rs:50:5
[INFO] [stderr]    |
[INFO] [stderr] 50 |     BlackKing,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `WhiteKing`
[INFO] [stderr]   --> src/main.rs:51:5
[INFO] [stderr]    |
[INFO] [stderr] 51 |     WhiteKing,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `get_tile_owner_at`
[INFO] [stderr]    --> src/main.rs:171:12
[INFO] [stderr]     |
[INFO] [stderr] 171 |     pub fn get_tile_owner_at(&self, index: Index) -> Result<Option<Player>, &str> {
[INFO] [stderr]     |            ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `MultiCapture`
[INFO] [stderr]    --> src/main.rs:843:5
[INFO] [stderr]     |
[INFO] [stderr] 843 |     MultiCapture(Vec<Index>),
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `KingMove`
[INFO] [stderr]    --> src/main.rs:844:5
[INFO] [stderr]     |
[INFO] [stderr] 844 |     KingMove(Index),
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `KingCapture`
[INFO] [stderr]    --> src/main.rs:845:5
[INFO] [stderr]     |
[INFO] [stderr] 845 | /     KingCapture {
[INFO] [stderr] 846 | |         target_index: Index,
[INFO] [stderr] 847 | |         captured_index: Index,
[INFO] [stderr] 848 | |     },
[INFO] [stderr]     | |_____^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `KingMultiCapture`
[INFO] [stderr]    --> src/main.rs:849:5
[INFO] [stderr]     |
[INFO] [stderr] 849 |     KingMultiCapture(Vec<Index>),
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: panic message is not a string literal
[INFO] [stderr]    --> src/main.rs:338:40
[INFO] [stderr]     |
[INFO] [stderr] 338 |                     Err(msg) => panic!(msg),
[INFO] [stderr]     |                                        ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stderr]     = note: this is no longer accepted in Rust 2021
[INFO] [stderr] help: add a "{}" format string to Display the message
[INFO] [stderr]     |
[INFO] [stderr] 338 |                     Err(msg) => panic!("{}", msg),
[INFO] [stderr]     |                                        ^^^^^
[INFO] [stderr] help: or use std::panic::panic_any instead
[INFO] [stderr]     |
[INFO] [stderr] 338 |                     Err(msg) => std::panic::panic_any(msg),
[INFO] [stderr]     |                                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: panic message is not a string literal
[INFO] [stderr]    --> src/main.rs:688:35
[INFO] [stderr]     |
[INFO] [stderr] 688 |             Tile::Empty => panic!(INTERNAL_ERROR_MESSAGE),
[INFO] [stderr]     |                                   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this is no longer accepted in Rust 2021
[INFO] [stderr] help: add a "{}" format string to Display the message
[INFO] [stderr]     |
[INFO] [stderr] 688 |             Tile::Empty => panic!("{}", INTERNAL_ERROR_MESSAGE),
[INFO] [stderr]     |                                   ^^^^^
[INFO] [stderr] help: or use std::panic::panic_any instead
[INFO] [stderr]     |
[INFO] [stderr] 688 |             Tile::Empty => std::panic::panic_any(INTERNAL_ERROR_MESSAGE),
[INFO] [stderr]     |                            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 9 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/checkers-ba58ab922d0ca200)
[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" "afacba4c012fb69c5c081536a39eb8d3829fb7c93a48e3648913498fe84cc14c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "afacba4c012fb69c5c081536a39eb8d3829fb7c93a48e3648913498fe84cc14c", kill_on_drop: false }`
[INFO] [stdout] afacba4c012fb69c5c081536a39eb8d3829fb7c93a48e3648913498fe84cc14c