[INFO] cloning repository https://github.com/cs-patzer/chess-engine
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cs-patzer/chess-engine" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcs-patzer%2Fchess-engine", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcs-patzer%2Fchess-engine'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f55ceaefb6635494264fc5e64c3d55c1b13a2889
[INFO] checking cs-patzer/chess-engine against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcs-patzer%2Fchess-engine" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/cs-patzer/chess-engine
[INFO] finished tweaking git repo https://github.com/cs-patzer/chess-engine
[INFO] tweaked toml for git repo https://github.com/cs-patzer/chess-engine written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/cs-patzer/chess-engine on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/cs-patzer/chess-engine 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fdaedab37a6905cb7d78692ab3215e477a6fa33f846405664c46f0ddc03aaea5
[INFO] running `Command { std: "docker" "start" "-a" "fdaedab37a6905cb7d78692ab3215e477a6fa33f846405664c46f0ddc03aaea5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fdaedab37a6905cb7d78692ab3215e477a6fa33f846405664c46f0ddc03aaea5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fdaedab37a6905cb7d78692ab3215e477a6fa33f846405664c46f0ddc03aaea5", kill_on_drop: false }`
[INFO] [stdout] fdaedab37a6905cb7d78692ab3215e477a6fa33f846405664c46f0ddc03aaea5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=forbid -Dunmustuse_in_always_ok" "-e" "RUSTDOCFLAGS=--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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d518c8795452fc96ad45eebd5bb4a73897c38b5a964fb9cfa5d4becd8053a010
[INFO] running `Command { std: "docker" "start" "-a" "d518c8795452fc96ad45eebd5bb4a73897c38b5a964fb9cfa5d4becd8053a010", kill_on_drop: false }`
[INFO] [stderr]     Checking ladybug v0.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `nps` is never read
[INFO] [stdout]   --> src/search/negamax.rs:36:33
[INFO] [stdout]    |
[INFO] [stdout] 36 |             let mut nps: u128 = 0;
[INFO] [stdout]    |                                 ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `state` is never read
[INFO] [stdout]   --> src/ladybug.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub struct Ladybug {
[INFO] [stdout]    |            ------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 16 |     state: State,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Busy` is never constructed
[INFO] [stdout]   --> src/ladybug.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 40 | enum State {
[INFO] [stdout]    |      ----- variant in this enum
[INFO] [stdout] 41 |     Idle,
[INFO] [stdout] 42 |     Busy,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `nps` is never read
[INFO] [stdout]   --> src/search/negamax.rs:36:33
[INFO] [stdout]    |
[INFO] [stdout] 36 |             let mut nps: u128 = 0;
[INFO] [stdout]    |                                 ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `position`
[INFO] [stdout]    --> src/zobrist.rs:110:13
[INFO] [stdout]     |
[INFO] [stdout] 110 |         let position = Board::from_fen("rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3 0 1").unwrap().position;
[INFO] [stdout]     |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_position`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `position`
[INFO] [stdout]    --> src/zobrist.rs:114:13
[INFO] [stdout]     |
[INFO] [stdout] 114 |         let position = Board::from_fen("rnbqkbnr/ppp1pppp/8/3p4/4P3/8/PPPP1PPP/RNBQKBNR w KQkq d6 0 2").unwrap().position;
[INFO] [stdout]     |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_position`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `state` is never read
[INFO] [stdout]   --> src/ladybug.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub struct Ladybug {
[INFO] [stdout]    |            ------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 16 |     state: State,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Busy` is never constructed
[INFO] [stdout]   --> src/ladybug.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 40 | enum State {
[INFO] [stdout]    |      ----- variant in this enum
[INFO] [stdout] 41 |     Idle,
[INFO] [stdout] 42 |     Busy,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.42s
[INFO] running `Command { std: "docker" "inspect" "d518c8795452fc96ad45eebd5bb4a73897c38b5a964fb9cfa5d4becd8053a010", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d518c8795452fc96ad45eebd5bb4a73897c38b5a964fb9cfa5d4becd8053a010", kill_on_drop: false }`
[INFO] [stdout] d518c8795452fc96ad45eebd5bb4a73897c38b5a964fb9cfa5d4becd8053a010