Dec 05 01:21:40.142 INFO checking MainShayne233/concurrency_demo against try#1df97983eb2057dc6a8f7eb364e263b51ae23230 for pr-56481
Dec 05 01:21:40.142 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-1/try#1df97983eb2057dc6a8f7eb364e263b51ae23230:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/pr-56481/try#1df97983eb2057dc6a8f7eb364e263b51ae23230:/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 +1df97983eb2057dc6a8f7eb364e263b51ae23230-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 01:21:40.571 INFO [stdout] 8561c7614c54606b5736edd016dfe82d4e63dc72967db255c9c5cd74c8d4d57e
Dec 05 01:21:40.573 INFO running `"docker" "start" "-a" "8561c7614c54606b5736edd016dfe82d4e63dc72967db255c9c5cd74c8d4d57e"`
Dec 05 01:21:41.701 INFO [stderr] usermod: no changes
Dec 05 01:21:41.754 INFO [stderr]     Checking concurrency_demo v0.1.0 (/source)
Dec 05 01:21:42.217 INFO [stderr] warning: field is never used: `workers`
Dec 05 01:21:42.218 INFO [stderr]  --> src/lib.rs:7:5
Dec 05 01:21:42.218 INFO [stderr]   |
Dec 05 01:21:42.218 INFO [stderr] 7 |     workers: Vec<Worker>,
Dec 05 01:21:42.227 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:42.227 INFO [stderr]   |
Dec 05 01:21:42.227 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 05 01:21:42.227 INFO [stderr] 
Dec 05 01:21:42.227 INFO [stderr] warning: field is never used: `id`
Dec 05 01:21:42.227 INFO [stderr]   --> src/lib.rs:49:5
Dec 05 01:21:42.227 INFO [stderr]    |
Dec 05 01:21:42.227 INFO [stderr] 49 |     id: usize,
Dec 05 01:21:42.227 INFO [stderr]    |     ^^^^^^^^^
Dec 05 01:21:42.227 INFO [stderr] 
Dec 05 01:21:42.227 INFO [stderr] warning: field is never used: `thread`
Dec 05 01:21:42.227 INFO [stderr]   --> src/lib.rs:50:5
Dec 05 01:21:42.227 INFO [stderr]    |
Dec 05 01:21:42.227 INFO [stderr] 50 |     thread: thread::JoinHandle<()>,
Dec 05 01:21:42.227 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:42.227 INFO [stderr] 
Dec 05 01:21:42.272 INFO [stderr] warning: field is never used: `workers`
Dec 05 01:21:42.272 INFO [stderr]  --> src/lib.rs:7:5
Dec 05 01:21:42.272 INFO [stderr]   |
Dec 05 01:21:42.272 INFO [stderr] 7 |     workers: Vec<Worker>,
Dec 05 01:21:42.272 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:42.272 INFO [stderr]   |
Dec 05 01:21:42.272 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 05 01:21:42.272 INFO [stderr] 
Dec 05 01:21:42.272 INFO [stderr] warning: field is never used: `id`
Dec 05 01:21:42.272 INFO [stderr]   --> src/lib.rs:49:5
Dec 05 01:21:42.272 INFO [stderr]    |
Dec 05 01:21:42.272 INFO [stderr] 49 |     id: usize,
Dec 05 01:21:42.272 INFO [stderr]    |     ^^^^^^^^^
Dec 05 01:21:42.272 INFO [stderr] 
Dec 05 01:21:42.272 INFO [stderr] warning: field is never used: `thread`
Dec 05 01:21:42.272 INFO [stderr]   --> src/lib.rs:50:5
Dec 05 01:21:42.272 INFO [stderr]    |
Dec 05 01:21:42.272 INFO [stderr] 50 |     thread: thread::JoinHandle<()>,
Dec 05 01:21:42.272 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:42.272 INFO [stderr] 
Dec 05 01:21:42.939 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.21s
Dec 05 01:21:42.941 INFO [stderr] su: No module specific data is present
Dec 05 01:21:43.686 INFO running `"docker" "inspect" "8561c7614c54606b5736edd016dfe82d4e63dc72967db255c9c5cd74c8d4d57e"`
Dec 05 01:21:43.997 INFO running `"docker" "rm" "-f" "8561c7614c54606b5736edd016dfe82d4e63dc72967db255c9c5cd74c8d4d57e"`
Dec 05 01:21:44.319 INFO [stdout] 8561c7614c54606b5736edd016dfe82d4e63dc72967db255c9c5cd74c8d4d57e