Dec 18 06:36:53.476 INFO checking MainShayne233/concurrency_demo against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 06:36:53.476 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-0/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/gh/MainShayne233/concurrency_demo:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 06:36:53.856 INFO [stdout] 2fc9dda5b98ea72b0555668ccd0a1b735c011bd1390108676c2f97249dc9c277
Dec 18 06:36:53.858 INFO running `"docker" "start" "-a" "2fc9dda5b98ea72b0555668ccd0a1b735c011bd1390108676c2f97249dc9c277"`
Dec 18 06:36:55.732 INFO [stderr]     Checking concurrency_demo v0.1.0 (/opt/crater/workdir)
Dec 18 06:36:56.083 INFO [stderr] warning: field is never used: `workers`
Dec 18 06:36:56.083 INFO [stderr]  --> src/lib.rs:7:5
Dec 18 06:36:56.083 INFO [stderr]   |
Dec 18 06:36:56.083 INFO [stderr] 7 |     workers: Vec<Worker>,
Dec 18 06:36:56.083 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
Dec 18 06:36:56.083 INFO [stderr]   |
Dec 18 06:36:56.083 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 18 06:36:56.083 INFO [stderr] 
Dec 18 06:36:56.083 INFO [stderr] warning: field is never used: `id`
Dec 18 06:36:56.083 INFO [stderr]   --> src/lib.rs:49:5
Dec 18 06:36:56.083 INFO [stderr]    |
Dec 18 06:36:56.083 INFO [stderr] 49 |     id: usize,
Dec 18 06:36:56.083 INFO [stderr]    |     ^^^^^^^^^
Dec 18 06:36:56.083 INFO [stderr] 
Dec 18 06:36:56.083 INFO [stderr] warning: field is never used: `thread`
Dec 18 06:36:56.083 INFO [stderr]   --> src/lib.rs:50:5
Dec 18 06:36:56.083 INFO [stderr]    |
Dec 18 06:36:56.083 INFO [stderr] 50 |     thread: thread::JoinHandle<()>,
Dec 18 06:36:56.083 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 06:36:56.083 INFO [stderr] 
Dec 18 06:36:56.340 INFO [stderr] warning: field is never used: `workers`
Dec 18 06:36:56.340 INFO [stderr]  --> src/lib.rs:7:5
Dec 18 06:36:56.340 INFO [stderr]   |
Dec 18 06:36:56.340 INFO [stderr] 7 |     workers: Vec<Worker>,
Dec 18 06:36:56.340 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
Dec 18 06:36:56.340 INFO [stderr]   |
Dec 18 06:36:56.340 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 18 06:36:56.340 INFO [stderr] 
Dec 18 06:36:56.340 INFO [stderr] warning: field is never used: `id`
Dec 18 06:36:56.340 INFO [stderr]   --> src/lib.rs:49:5
Dec 18 06:36:56.340 INFO [stderr]    |
Dec 18 06:36:56.340 INFO [stderr] 49 |     id: usize,
Dec 18 06:36:56.340 INFO [stderr]    |     ^^^^^^^^^
Dec 18 06:36:56.340 INFO [stderr] 
Dec 18 06:36:56.340 INFO [stderr] warning: field is never used: `thread`
Dec 18 06:36:56.340 INFO [stderr]   --> src/lib.rs:50:5
Dec 18 06:36:56.340 INFO [stderr]    |
Dec 18 06:36:56.340 INFO [stderr] 50 |     thread: thread::JoinHandle<()>,
Dec 18 06:36:56.340 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 06:36:56.340 INFO [stderr] 
Dec 18 06:36:56.672 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.96s
Dec 18 06:36:57.788 INFO running `"docker" "inspect" "2fc9dda5b98ea72b0555668ccd0a1b735c011bd1390108676c2f97249dc9c277"`
Dec 18 06:36:58.014 INFO running `"docker" "rm" "-f" "2fc9dda5b98ea72b0555668ccd0a1b735c011bd1390108676c2f97249dc9c277"`
Dec 18 06:36:58.352 INFO [stdout] 2fc9dda5b98ea72b0555668ccd0a1b735c011bd1390108676c2f97249dc9c277