[INFO] cloning repository https://github.com/twitchax/sudoku_solver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/twitchax/sudoku_solver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftwitchax%2Fsudoku_solver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftwitchax%2Fsudoku_solver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dde99062fe11ecedc05036db3ef7b0ea0cef930c
[INFO] checking twitchax/sudoku_solver against master#21de280cccb4eb02ead6bf0af40e2355a9136d6f for pr-100043-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftwitchax%2Fsudoku_solver" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/twitchax/sudoku_solver on toolchain 21de280cccb4eb02ead6bf0af40e2355a9136d6f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+21de280cccb4eb02ead6bf0af40e2355a9136d6f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/twitchax/sudoku_solver
[INFO] finished tweaking git repo https://github.com/twitchax/sudoku_solver
[INFO] tweaked toml for git repo https://github.com/twitchax/sudoku_solver written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/twitchax/sudoku_solver already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+21de280cccb4eb02ead6bf0af40e2355a9136d6f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded crossbeam-queue v0.2.3
[INFO] [stderr]   Downloaded memoffset v0.5.5
[INFO] [stderr]   Downloaded num-integer v0.1.43
[INFO] [stderr]   Downloaded crossbeam-channel v0.4.2
[INFO] [stderr]   Downloaded colored v1.9.3
[INFO] [stderr]   Downloaded libc v0.2.72
[INFO] [stderr]   Downloaded core_affinity v0.5.10
[INFO] [stderr]   Downloaded hermit-abi v0.1.15
[INFO] [stderr]   Downloaded simple_logger v1.6.0
[INFO] [stderr]   Downloaded crossbeam v0.7.3
[INFO] [stderr]   Downloaded once_cell v1.4.1
[INFO] [stderr]   Downloaded num-traits v0.2.12
[INFO] [stderr]   Downloaded chrono v0.4.13
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:824c28ce115f6b999260af6986f3384c158e782489540e41c0b698ca1d9fd927" "/opt/rustwide/cargo-home/bin/cargo" "+21de280cccb4eb02ead6bf0af40e2355a9136d6f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 80b8db8e7d127cedfb2c0300511da537ef1a0fe1ed1d85a703332c732407379c
[INFO] running `Command { std: "docker" "start" "-a" "80b8db8e7d127cedfb2c0300511da537ef1a0fe1ed1d85a703332c732407379c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "80b8db8e7d127cedfb2c0300511da537ef1a0fe1ed1d85a703332c732407379c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "80b8db8e7d127cedfb2c0300511da537ef1a0fe1ed1d85a703332c732407379c", kill_on_drop: false }`
[INFO] [stdout] 80b8db8e7d127cedfb2c0300511da537ef1a0fe1ed1d85a703332c732407379c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "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@sha256:824c28ce115f6b999260af6986f3384c158e782489540e41c0b698ca1d9fd927" "/opt/rustwide/cargo-home/bin/cargo" "+21de280cccb4eb02ead6bf0af40e2355a9136d6f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f7850ff05f4b54467e4a19d69ee7265bbf1c63f64e1c288eeeec1425fc258f19
[INFO] running `Command { std: "docker" "start" "-a" "f7850ff05f4b54467e4a19d69ee7265bbf1c63f64e1c288eeeec1425fc258f19", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling libc v0.2.72
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]     Checking once_cell v1.4.1
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling memoffset v0.5.5
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]     Checking crossbeam-channel v0.4.2
[INFO] [stderr]     Checking crossbeam-queue v0.2.3
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking colored v1.9.3
[INFO] [stderr]     Checking core_affinity v0.5.10
[INFO] [stderr]     Checking crossbeam-deque v0.7.3
[INFO] [stderr]     Checking crossbeam v0.7.3
[INFO] [stderr]     Checking chrono v0.4.13
[INFO] [stderr]     Checking simple_logger v1.6.0
[INFO] [stderr]     Checking sudoku_solver v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `num_workers` is never read
[INFO] [stdout]   --> src/beggar_pool.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub struct BeggarPool<T>
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 28 |     num_workers: usize,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout]    = note: `BeggarPool` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `num_workers` is never read
[INFO] [stdout]   --> src/beggar_pool.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub struct BeggarPool<T>
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 28 |     num_workers: usize,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout]    = note: `BeggarPool` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.99s
[INFO] running `Command { std: "docker" "inspect" "f7850ff05f4b54467e4a19d69ee7265bbf1c63f64e1c288eeeec1425fc258f19", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f7850ff05f4b54467e4a19d69ee7265bbf1c63f64e1c288eeeec1425fc258f19", kill_on_drop: false }`
[INFO] [stdout] f7850ff05f4b54467e4a19d69ee7265bbf1c63f64e1c288eeeec1425fc258f19