[INFO] cloning repository https://github.com/peter-wilkins-mayden/eight-puzzle
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/peter-wilkins-mayden/eight-puzzle" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpeter-wilkins-mayden%2Feight-puzzle", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpeter-wilkins-mayden%2Feight-puzzle'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7f4028533ac5b684fb947203f379eb48b1d86bec
[INFO] checking peter-wilkins-mayden/eight-puzzle against master#f5f33ec0e0455eefa72fc5567eb1280a4d5ee206 for pr-83312
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpeter-wilkins-mayden%2Feight-puzzle" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/peter-wilkins-mayden/eight-puzzle on toolchain f5f33ec0e0455eefa72fc5567eb1280a4d5ee206
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f5f33ec0e0455eefa72fc5567eb1280a4d5ee206" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/peter-wilkins-mayden/eight-puzzle
[INFO] finished tweaking git repo https://github.com/peter-wilkins-mayden/eight-puzzle
[INFO] tweaked toml for git repo https://github.com/peter-wilkins-mayden/eight-puzzle written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/peter-wilkins-mayden/eight-puzzle already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f5f33ec0e0455eefa72fc5567eb1280a4d5ee206" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+f5f33ec0e0455eefa72fc5567eb1280a4d5ee206" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9336dcc77be458aa202b5ead89d04d472e467e38fcc6450f0a9b9b79e9fbbec9
[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" "9336dcc77be458aa202b5ead89d04d472e467e38fcc6450f0a9b9b79e9fbbec9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9336dcc77be458aa202b5ead89d04d472e467e38fcc6450f0a9b9b79e9fbbec9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9336dcc77be458aa202b5ead89d04d472e467e38fcc6450f0a9b9b79e9fbbec9", kill_on_drop: false }`
[INFO] [stdout] 9336dcc77be458aa202b5ead89d04d472e467e38fcc6450f0a9b9b79e9fbbec9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+f5f33ec0e0455eefa72fc5567eb1280a4d5ee206" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] adda25e30594088dc5f1d996bf5aa15bdc510694d41673116d59ea5047da8bc5
[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" "adda25e30594088dc5f1d996bf5aa15bdc510694d41673116d59ea5047da8bc5", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling num-rational v0.2.2
[INFO] [stderr]    Compiling num-complex v0.2.3
[INFO] [stderr]    Compiling num-iter v0.1.39
[INFO] [stderr]     Checking num-bigint v0.2.2
[INFO] [stderr]     Checking num v0.2.0
[INFO] [stderr]     Checking eight-puzzle v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `hamming`
[INFO] [stdout]   --> src/main.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 |     fn hamming(&self) -> i32 {
[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: `is_solvable`
[INFO] [stdout]   --> src/main.rs:89:8
[INFO] [stdout]    |
[INFO] [stdout] 89 |     fn is_solvable(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.50s
[INFO] running `Command { std: "docker" "inspect" "adda25e30594088dc5f1d996bf5aa15bdc510694d41673116d59ea5047da8bc5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "adda25e30594088dc5f1d996bf5aa15bdc510694d41673116d59ea5047da8bc5", kill_on_drop: false }`
[INFO] [stdout] adda25e30594088dc5f1d996bf5aa15bdc510694d41673116d59ea5047da8bc5