[INFO] cloning repository https://github.com/mpgarate/rust-fifteen-puzzle
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mpgarate/rust-fifteen-puzzle" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmpgarate%2Frust-fifteen-puzzle", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmpgarate%2Frust-fifteen-puzzle'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ecc1c4e0f50d6d7197aac0e18cc619f2fff226db
[INFO] checking mpgarate/rust-fifteen-puzzle against master#a5f164faad4a2fed606b8160fd7ecd2d5cbba381 for pr-84920
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmpgarate%2Frust-fifteen-puzzle" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mpgarate/rust-fifteen-puzzle on toolchain a5f164faad4a2fed606b8160fd7ecd2d5cbba381
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mpgarate/rust-fifteen-puzzle
[INFO] finished tweaking git repo https://github.com/mpgarate/rust-fifteen-puzzle
[INFO] tweaked toml for git repo https://github.com/mpgarate/rust-fifteen-puzzle written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/mpgarate/rust-fifteen-puzzle already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] error: the lock file /workspace/builds/worker-8/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/passcod/cargo-watch`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9af3303aaaa95f86c5d28ed24a38032a09ef709423fe9b9c4f7071fb4ffd335a
[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" "9af3303aaaa95f86c5d28ed24a38032a09ef709423fe9b9c4f7071fb4ffd335a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9af3303aaaa95f86c5d28ed24a38032a09ef709423fe9b9c4f7071fb4ffd335a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9af3303aaaa95f86c5d28ed24a38032a09ef709423fe9b9c4f7071fb4ffd335a", kill_on_drop: false }`
[INFO] [stdout] 9af3303aaaa95f86c5d28ed24a38032a09ef709423fe9b9c4f7071fb4ffd335a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 059721a7fcb36c453c6174d8dac20ef237b0c5598b5c3068ca972b0ab603c51e
[INFO] running `Command { std: "docker" "start" "-a" "059721a7fcb36c453c6174d8dac20ef237b0c5598b5c3068ca972b0ab603c51e", kill_on_drop: false }`
[INFO] [stderr]     Checking fifteen_puzzle v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/solver.rs:128:8
[INFO] [stdout]     |
[INFO] [stdout] 128 |     if (depth > 100000) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/solver.rs:128:8
[INFO] [stdout]     |
[INFO] [stdout] 128 |     if (depth > 100000) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/solver.rs:75:46
[INFO] [stdout]    |
[INFO] [stdout] 75 | pub fn depth_limited_dfs(state: SolverState, mut depth: u64) -> Option<Vec<MoveDirection>> {
[INFO] [stdout]    |                                              ----^^^^^
[INFO] [stdout]    |                                              |
[INFO] [stdout]    |                                              help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `depth_limited_dfs`
[INFO] [stdout]   --> src/solver.rs:75:8
[INFO] [stdout]    |
[INFO] [stdout] 75 | pub fn depth_limited_dfs(state: SolverState, mut depth: u64) -> Option<Vec<MoveDirection>> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `solve_idfs`
[INFO] [stdout]    --> src/solver.rs:118:8
[INFO] [stdout]     |
[INFO] [stdout] 118 | pub fn solve_idfs(state: GameState) -> Option<Vec<MoveDirection>> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/solver.rs:75:46
[INFO] [stdout]    |
[INFO] [stdout] 75 | pub fn depth_limited_dfs(state: SolverState, mut depth: u64) -> Option<Vec<MoveDirection>> {
[INFO] [stdout]    |                                              ----^^^^^
[INFO] [stdout]    |                                              |
[INFO] [stdout]    |                                              help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.10s
[INFO] running `Command { std: "docker" "inspect" "059721a7fcb36c453c6174d8dac20ef237b0c5598b5c3068ca972b0ab603c51e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "059721a7fcb36c453c6174d8dac20ef237b0c5598b5c3068ca972b0ab603c51e", kill_on_drop: false }`
[INFO] [stdout] 059721a7fcb36c453c6174d8dac20ef237b0c5598b5c3068ca972b0ab603c51e