Nov 28 12:22:45.336 INFO checking MainShayne233/concurrency_demo against master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5 for pr-56074
Nov 28 12:22:45.336 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56074/worker-4/master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-56074/master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +0b9f19dff1347e29bf4362ab5a8fab84b43023b5-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Nov 28 12:22:45.725 INFO [stdout] 480a494e418b84de23fa112b60349514b9624652f0ae50a112bf6c919bb2112b
Nov 28 12:22:45.726 INFO running `"docker" "start" "-a" "480a494e418b84de23fa112b60349514b9624652f0ae50a112bf6c919bb2112b"`
Nov 28 12:22:47.911 INFO [stderr] usermod: no changes
Nov 28 12:22:48.004 INFO [stderr]     Checking concurrency_demo v0.1.0 (/source)
Nov 28 12:22:48.708 INFO [stderr] warning: field is never used: `workers`
Nov 28 12:22:48.708 INFO [stderr]  --> src/lib.rs:7:5
Nov 28 12:22:48.708 INFO [stderr]   |
Nov 28 12:22:48.708 INFO [stderr] 7 |     workers: Vec<Worker>,
Nov 28 12:22:48.708 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
Nov 28 12:22:48.708 INFO [stderr]   |
Nov 28 12:22:48.708 INFO [stderr]   = note: #[warn(dead_code)] on by default
Nov 28 12:22:48.708 INFO [stderr] 
Nov 28 12:22:48.708 INFO [stderr] warning: field is never used: `id`
Nov 28 12:22:48.708 INFO [stderr]   --> src/lib.rs:49:5
Nov 28 12:22:48.708 INFO [stderr]    |
Nov 28 12:22:48.708 INFO [stderr] 49 |     id: usize,
Nov 28 12:22:48.708 INFO [stderr]    |     ^^^^^^^^^
Nov 28 12:22:48.708 INFO [stderr] 
Nov 28 12:22:48.708 INFO [stderr] warning: field is never used: `thread`
Nov 28 12:22:48.708 INFO [stderr]   --> src/lib.rs:50:5
Nov 28 12:22:48.708 INFO [stderr]    |
Nov 28 12:22:48.708 INFO [stderr] 50 |     thread: thread::JoinHandle<()>,
Nov 28 12:22:48.708 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 12:22:48.708 INFO [stderr] 
Nov 28 12:22:48.832 INFO [stderr] warning: field is never used: `workers`
Nov 28 12:22:48.832 INFO [stderr]  --> src/lib.rs:7:5
Nov 28 12:22:48.832 INFO [stderr]   |
Nov 28 12:22:48.832 INFO [stderr] 7 |     workers: Vec<Worker>,
Nov 28 12:22:48.832 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
Nov 28 12:22:48.832 INFO [stderr]   |
Nov 28 12:22:48.832 INFO [stderr]   = note: #[warn(dead_code)] on by default
Nov 28 12:22:48.832 INFO [stderr] 
Nov 28 12:22:48.832 INFO [stderr] warning: field is never used: `id`
Nov 28 12:22:48.832 INFO [stderr]   --> src/lib.rs:49:5
Nov 28 12:22:48.832 INFO [stderr]    |
Nov 28 12:22:48.832 INFO [stderr] 49 |     id: usize,
Nov 28 12:22:48.832 INFO [stderr]    |     ^^^^^^^^^
Nov 28 12:22:48.832 INFO [stderr] 
Nov 28 12:22:48.832 INFO [stderr] warning: field is never used: `thread`
Nov 28 12:22:48.832 INFO [stderr]   --> src/lib.rs:50:5
Nov 28 12:22:48.832 INFO [stderr]    |
Nov 28 12:22:48.832 INFO [stderr] 50 |     thread: thread::JoinHandle<()>,
Nov 28 12:22:48.832 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 12:22:48.832 INFO [stderr] 
Nov 28 12:22:49.718 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.77s
Nov 28 12:22:49.720 INFO [stderr] su: No module specific data is present
Nov 28 12:22:50.385 INFO running `"docker" "inspect" "480a494e418b84de23fa112b60349514b9624652f0ae50a112bf6c919bb2112b"`
Nov 28 12:22:50.698 INFO running `"docker" "rm" "-f" "480a494e418b84de23fa112b60349514b9624652f0ae50a112bf6c919bb2112b"`
Nov 28 12:22:50.984 INFO [stdout] 480a494e418b84de23fa112b60349514b9624652f0ae50a112bf6c919bb2112b