Dec 05 01:21:42.572 INFO checking MainShayne233/concurrency_demo against master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc for pr-56481
Dec 05 01:21:42.572 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-6/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/pr-56481/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/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 +c8ae2de8363be088604ffa2ccba84ff7ad7250bc-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"`
Dec 05 01:21:42.972 INFO [stdout] f841e39f8877799af713ebf155450b863c6a2ba8bba2b1108f7b010cab338f5a
Dec 05 01:21:42.974 INFO running `"docker" "start" "-a" "f841e39f8877799af713ebf155450b863c6a2ba8bba2b1108f7b010cab338f5a"`
Dec 05 01:21:43.996 INFO [stderr] usermod: no changes
Dec 05 01:21:44.044 INFO [stderr]     Checking concurrency_demo v0.1.0 (/source)
Dec 05 01:21:44.715 INFO [stderr] warning: field is never used: `workers`
Dec 05 01:21:44.715 INFO [stderr]  --> src/lib.rs:7:5
Dec 05 01:21:44.716 INFO [stderr]   |
Dec 05 01:21:44.716 INFO [stderr] 7 |     workers: Vec<Worker>,
Dec 05 01:21:44.716 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:44.716 INFO [stderr]   |
Dec 05 01:21:44.716 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 05 01:21:44.717 INFO [stderr] 
Dec 05 01:21:44.717 INFO [stderr] warning: field is never used: `id`
Dec 05 01:21:44.717 INFO [stderr]   --> src/lib.rs:49:5
Dec 05 01:21:44.717 INFO [stderr]    |
Dec 05 01:21:44.717 INFO [stderr] 49 |     id: usize,
Dec 05 01:21:44.717 INFO [stderr]    |     ^^^^^^^^^
Dec 05 01:21:44.717 INFO [stderr] 
Dec 05 01:21:44.717 INFO [stderr] warning: field is never used: `thread`
Dec 05 01:21:44.723 INFO [stderr]   --> src/lib.rs:50:5
Dec 05 01:21:44.723 INFO [stderr]    |
Dec 05 01:21:44.723 INFO [stderr] 50 |     thread: thread::JoinHandle<()>,
Dec 05 01:21:44.723 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:44.723 INFO [stderr] 
Dec 05 01:21:45.177 INFO [stderr] warning: field is never used: `workers`
Dec 05 01:21:45.177 INFO [stderr]  --> src/lib.rs:7:5
Dec 05 01:21:45.178 INFO [stderr]   |
Dec 05 01:21:45.178 INFO [stderr] 7 |     workers: Vec<Worker>,
Dec 05 01:21:45.179 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:45.195 INFO [stderr]   |
Dec 05 01:21:45.195 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 05 01:21:45.196 INFO [stderr] 
Dec 05 01:21:45.196 INFO [stderr] warning: field is never used: `id`
Dec 05 01:21:45.196 INFO [stderr]   --> src/lib.rs:49:5
Dec 05 01:21:45.197 INFO [stderr]    |
Dec 05 01:21:45.197 INFO [stderr] 49 |     id: usize,
Dec 05 01:21:45.197 INFO [stderr]    |     ^^^^^^^^^
Dec 05 01:21:45.197 INFO [stderr] 
Dec 05 01:21:45.198 INFO [stderr] warning: field is never used: `thread`
Dec 05 01:21:45.198 INFO [stderr]   --> src/lib.rs:50:5
Dec 05 01:21:45.198 INFO [stderr]    |
Dec 05 01:21:45.198 INFO [stderr] 50 |     thread: thread::JoinHandle<()>,
Dec 05 01:21:45.198 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:45.203 INFO [stderr] 
Dec 05 01:21:46.004 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.97s
Dec 05 01:21:46.007 INFO [stderr] su: No module specific data is present
Dec 05 01:21:46.737 INFO running `"docker" "inspect" "f841e39f8877799af713ebf155450b863c6a2ba8bba2b1108f7b010cab338f5a"`
Dec 05 01:21:46.952 INFO running `"docker" "rm" "-f" "f841e39f8877799af713ebf155450b863c6a2ba8bba2b1108f7b010cab338f5a"`
Dec 05 01:21:47.213 INFO [stdout] f841e39f8877799af713ebf155450b863c6a2ba8bba2b1108f7b010cab338f5a