[INFO] fetching crate reversi 0.1.0...
[INFO] testing reversi-0.1.0 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate reversi 0.1.0 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate reversi 0.1.0
[INFO] finished tweaking crates.io crate reversi 0.1.0
[INFO] tweaked toml for crates.io crate reversi 0.1.0 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate reversi 0.1.0 on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate reversi 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9d0d985d4ef7869f07fbf5eef93b04700baab342c4e3a78c353d6f9223dd288f
[INFO] running `Command { std: "docker" "start" "-a" "9d0d985d4ef7869f07fbf5eef93b04700baab342c4e3a78c353d6f9223dd288f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9d0d985d4ef7869f07fbf5eef93b04700baab342c4e3a78c353d6f9223dd288f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9d0d985d4ef7869f07fbf5eef93b04700baab342c4e3a78c353d6f9223dd288f", kill_on_drop: false }`
[INFO] [stdout] 9d0d985d4ef7869f07fbf5eef93b04700baab342c4e3a78c353d6f9223dd288f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 88af0bd4fb0f5e1d46d0ea17f819643b27d352637b8a11575025ad27f46ecead
[INFO] running `Command { std: "docker" "start" "-a" "88af0bd4fb0f5e1d46d0ea17f819643b27d352637b8a11575025ad27f46ecead", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.73
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling ppv-lite86 v0.2.8
[INFO] [stderr]    Compiling regex-syntax v0.6.18
[INFO] [stderr]    Compiling thread_local v1.0.1
[INFO] [stderr]    Compiling ansi_term v0.12.1
[INFO] [stderr]    Compiling hashbrown v0.8.1
[INFO] [stderr]    Compiling indexmap v1.5.0
[INFO] [stderr]    Compiling aho-corasick v0.7.13
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling libmath v0.2.1
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling regex v1.3.9
[INFO] [stderr]    Compiling reversi v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `debug`
[INFO] [stdout]    --> src/main.rs:128:21
[INFO] [stdout]     |
[INFO] [stdout] 128 |     fn print(&self, debug: bool) {
[INFO] [stdout]     |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_debug`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `u` is never read
[INFO] [stdout]    --> src/main.rs:181:25
[INFO] [stdout]     |
[INFO] [stdout] 181 |         let mut u: u8 = 1;
[INFO] [stdout]     |                         ^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 194 |             u = 1;
[INFO] [stdout]     |             ----- `u` is overwritten here before the previous value is read
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `u` is never read
[INFO] [stdout]    --> src/main.rs:320:25
[INFO] [stdout]     |
[INFO] [stdout] 320 |         let mut u: u8 = 1; // used as the iter for get_new_pos()
[INFO] [stdout]     |                         ^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 326 |             u = 1;
[INFO] [stdout]     |             ----- `u` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `prev_player_score`
[INFO] [stdout]    --> src/main.rs:841:10
[INFO] [stdout]     |
[INFO] [stdout] 841 |     let (prev_player_score, prev_cpu_score): (u8, u8) = b.get_score();
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_prev_player_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `player_score`
[INFO] [stdout]    --> src/main.rs:857:14
[INFO] [stdout]     |
[INFO] [stdout] 857 |         let (player_score, cpu_score): (u8, u8) = new_board.get_score();
[INFO] [stdout]     |              ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_player_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `difficulty`
[INFO] [stdout]    --> src/main.rs:886:13
[INFO] [stdout]     |
[INFO] [stdout] 886 |         let difficulty: String = match cpu_diff.trim().to_string().as_str() {
[INFO] [stdout]     |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_difficulty`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:715:34
[INFO] [stdout]     |
[INFO] [stdout] 715 |         if !debug { print!("."); stdout().flush(); }
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 715 |         if !debug { print!("."); let _ = stdout().flush(); }
[INFO] [stdout]     |                                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.71s
[INFO] running `Command { std: "docker" "inspect" "88af0bd4fb0f5e1d46d0ea17f819643b27d352637b8a11575025ad27f46ecead", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88af0bd4fb0f5e1d46d0ea17f819643b27d352637b8a11575025ad27f46ecead", kill_on_drop: false }`
[INFO] [stdout] 88af0bd4fb0f5e1d46d0ea17f819643b27d352637b8a11575025ad27f46ecead
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4649759599c7923a7d298358640be55204fc4e6c863a10155ab4fff29f5da81b
[INFO] running `Command { std: "docker" "start" "-a" "4649759599c7923a7d298358640be55204fc4e6c863a10155ab4fff29f5da81b", kill_on_drop: false }`
[INFO] [stderr]    Compiling reversi v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `debug`
[INFO] [stdout]    --> src/main.rs:128:21
[INFO] [stdout]     |
[INFO] [stdout] 128 |     fn print(&self, debug: bool) {
[INFO] [stdout]     |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_debug`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `u` is never read
[INFO] [stdout]    --> src/main.rs:181:25
[INFO] [stdout]     |
[INFO] [stdout] 181 |         let mut u: u8 = 1;
[INFO] [stdout]     |                         ^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 194 |             u = 1;
[INFO] [stdout]     |             ----- `u` is overwritten here before the previous value is read
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `u` is never read
[INFO] [stdout]    --> src/main.rs:320:25
[INFO] [stdout]     |
[INFO] [stdout] 320 |         let mut u: u8 = 1; // used as the iter for get_new_pos()
[INFO] [stdout]     |                         ^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 326 |             u = 1;
[INFO] [stdout]     |             ----- `u` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `prev_player_score`
[INFO] [stdout]    --> src/main.rs:841:10
[INFO] [stdout]     |
[INFO] [stdout] 841 |     let (prev_player_score, prev_cpu_score): (u8, u8) = b.get_score();
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_prev_player_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `player_score`
[INFO] [stdout]    --> src/main.rs:857:14
[INFO] [stdout]     |
[INFO] [stdout] 857 |         let (player_score, cpu_score): (u8, u8) = new_board.get_score();
[INFO] [stdout]     |              ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_player_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `difficulty`
[INFO] [stdout]    --> src/main.rs:886:13
[INFO] [stdout]     |
[INFO] [stdout] 886 |         let difficulty: String = match cpu_diff.trim().to_string().as_str() {
[INFO] [stdout]     |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_difficulty`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:715:34
[INFO] [stdout]     |
[INFO] [stdout] 715 |         if !debug { print!("."); stdout().flush(); }
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 715 |         if !debug { print!("."); let _ = stdout().flush(); }
[INFO] [stdout]     |                                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.51s
[INFO] running `Command { std: "docker" "inspect" "4649759599c7923a7d298358640be55204fc4e6c863a10155ab4fff29f5da81b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4649759599c7923a7d298358640be55204fc4e6c863a10155ab4fff29f5da81b", kill_on_drop: false }`
[INFO] [stdout] 4649759599c7923a7d298358640be55204fc4e6c863a10155ab4fff29f5da81b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] ae84cdad0c36c57c0754bf30c895124668b5f4add5cc2f346a312b0ef62624cd
[INFO] running `Command { std: "docker" "start" "-a" "ae84cdad0c36c57c0754bf30c895124668b5f4add5cc2f346a312b0ef62624cd", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `debug`
[INFO] [stderr]    --> src/main.rs:128:21
[INFO] [stderr]     |
[INFO] [stderr] 128 |     fn print(&self, debug: bool) {
[INFO] [stderr]     |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_debug`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `u` is never read
[INFO] [stderr]    --> src/main.rs:181:25
[INFO] [stderr]     |
[INFO] [stderr] 181 |         let mut u: u8 = 1;
[INFO] [stderr]     |                         ^ this value is reassigned later and never used
[INFO] [stderr] ...
[INFO] [stderr] 194 |             u = 1;
[INFO] [stderr]     |             ----- `u` is overwritten here before the previous value is read
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `u` is never read
[INFO] [stderr]    --> src/main.rs:320:25
[INFO] [stderr]     |
[INFO] [stderr] 320 |         let mut u: u8 = 1; // used as the iter for get_new_pos()
[INFO] [stderr]     |                         ^ this value is reassigned later and never used
[INFO] [stderr] ...
[INFO] [stderr] 326 |             u = 1;
[INFO] [stderr]     |             ----- `u` is overwritten here before the previous value is read
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `prev_player_score`
[INFO] [stderr]    --> src/main.rs:841:10
[INFO] [stderr]     |
[INFO] [stderr] 841 |     let (prev_player_score, prev_cpu_score): (u8, u8) = b.get_score();
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_prev_player_score`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `player_score`
[INFO] [stderr]    --> src/main.rs:857:14
[INFO] [stderr]     |
[INFO] [stderr] 857 |         let (player_score, cpu_score): (u8, u8) = new_board.get_score();
[INFO] [stderr]     |              ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_player_score`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `difficulty`
[INFO] [stderr]    --> src/main.rs:886:13
[INFO] [stderr]     |
[INFO] [stderr] 886 |         let difficulty: String = match cpu_diff.trim().to_string().as_str() {
[INFO] [stderr]     |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_difficulty`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:715:34
[INFO] [stderr]     |
[INFO] [stderr] 715 |         if !debug { print!("."); stdout().flush(); }
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 715 |         if !debug { print!("."); let _ = stdout().flush(); }
[INFO] [stderr]     |                                  +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `reversi` (bin "reversi" test) generated 7 warnings (run `cargo fix --bin "reversi" -p reversi --tests` to apply 4 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/reversi-2ad09ff5dc0b8643)
[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" "ae84cdad0c36c57c0754bf30c895124668b5f4add5cc2f346a312b0ef62624cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ae84cdad0c36c57c0754bf30c895124668b5f4add5cc2f346a312b0ef62624cd", kill_on_drop: false }`
[INFO] [stdout] ae84cdad0c36c57c0754bf30c895124668b5f4add5cc2f346a312b0ef62624cd
