[INFO] cloning repository https://github.com/PanGan21/simple-threadpool
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/PanGan21/simple-threadpool" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPanGan21%2Fsimple-threadpool", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPanGan21%2Fsimple-threadpool'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e297219285a47b50804724be3c43f02cf2d68d03
[INFO] checking PanGan21/simple-threadpool/e297219285a47b50804724be3c43f02cf2d68d03 against master#a3f76a26e045a760bb1163b7eab36872985242d5 for pr-130930
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPanGan21%2Fsimple-threadpool" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/PanGan21/simple-threadpool on toolchain a3f76a26e045a760bb1163b7eab36872985242d5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a3f76a26e045a760bb1163b7eab36872985242d5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/PanGan21/simple-threadpool
[INFO] finished tweaking git repo https://github.com/PanGan21/simple-threadpool
[INFO] tweaked toml for git repo https://github.com/PanGan21/simple-threadpool written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/PanGan21/simple-threadpool 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" "+a3f76a26e045a760bb1163b7eab36872985242d5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+a3f76a26e045a760bb1163b7eab36872985242d5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6ab7f2f626330191bb6c2c6270f8acb4531316d9f45195fc5aa8269626de4d61
[INFO] running `Command { std: "docker" "start" "-a" "6ab7f2f626330191bb6c2c6270f8acb4531316d9f45195fc5aa8269626de4d61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6ab7f2f626330191bb6c2c6270f8acb4531316d9f45195fc5aa8269626de4d61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ab7f2f626330191bb6c2c6270f8acb4531316d9f45195fc5aa8269626de4d61", kill_on_drop: false }`
[INFO] [stdout] 6ab7f2f626330191bb6c2c6270f8acb4531316d9f45195fc5aa8269626de4d61
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+a3f76a26e045a760bb1163b7eab36872985242d5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2ace9cb615d1b57650bba832a750fd114d95c7c611ad1d814c3251b9b6044fd1
[INFO] running `Command { std: "docker" "start" "-a" "2ace9cb615d1b57650bba832a750fd114d95c7c611ad1d814c3251b9b6044fd1", kill_on_drop: false }`
[INFO] [stderr]     Checking simple_threadpool v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/threadpool.rs:14:15
[INFO] [stdout]    |
[INFO] [stdout] 14 | struct Worker(usize, Option<thread::JoinHandle<()>>);
[INFO] [stdout]    |        ------ ^^^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 14 | struct Worker((), Option<thread::JoinHandle<()>>);
[INFO] [stdout]    |               ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/threadpool.rs:14:15
[INFO] [stdout]    |
[INFO] [stdout] 14 | struct Worker(usize, Option<thread::JoinHandle<()>>);
[INFO] [stdout]    |        ------ ^^^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 14 | struct Worker((), Option<thread::JoinHandle<()>>);
[INFO] [stdout]    |               ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.09s
[INFO] running `Command { std: "docker" "inspect" "2ace9cb615d1b57650bba832a750fd114d95c7c611ad1d814c3251b9b6044fd1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ace9cb615d1b57650bba832a750fd114d95c7c611ad1d814c3251b9b6044fd1", kill_on_drop: false }`
[INFO] [stdout] 2ace9cb615d1b57650bba832a750fd114d95c7c611ad1d814c3251b9b6044fd1