Nov 30 09:53:33.345 INFO checking MainShayne233/concurrency_demo against try#32252761328f59ccfadb1bafb8148c685bc830b3 for pr-56323
Nov 30 09:53:33.345 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56323/worker-1/try#32252761328f59ccfadb1bafb8148c685bc830b3:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/pr-56323/try#32252761328f59ccfadb1bafb8148c685bc830b3:/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 +32252761328f59ccfadb1bafb8148c685bc830b3-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 30 09:53:33.858 INFO [stdout] 7ab3f800ab470d8d0bad73c2cb9512226e5d1623211ab33c77ce40c28ae6440a
Nov 30 09:53:33.868 INFO running `"docker" "start" "-a" "7ab3f800ab470d8d0bad73c2cb9512226e5d1623211ab33c77ce40c28ae6440a"`
Nov 30 09:53:35.246 INFO [stderr] usermod: no changes
Nov 30 09:53:35.312 INFO [stderr]     Checking concurrency_demo v0.1.0 (/source)
Nov 30 09:53:35.980 INFO [stderr] warning: field is never used: `workers`
Nov 30 09:53:35.980 INFO [stderr]  --> src/lib.rs:7:5
Nov 30 09:53:35.980 INFO [stderr]   |
Nov 30 09:53:35.980 INFO [stderr] 7 |     workers: Vec<Worker>,
Nov 30 09:53:35.980 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
Nov 30 09:53:35.980 INFO [stderr]   |
Nov 30 09:53:35.980 INFO [stderr]   = note: #[warn(dead_code)] on by default
Nov 30 09:53:35.980 INFO [stderr] 
Nov 30 09:53:35.980 INFO [stderr] warning: field is never used: `id`
Nov 30 09:53:35.980 INFO [stderr]   --> src/lib.rs:49:5
Nov 30 09:53:35.980 INFO [stderr]    |
Nov 30 09:53:35.980 INFO [stderr] 49 |     id: usize,
Nov 30 09:53:35.980 INFO [stderr]    |     ^^^^^^^^^
Nov 30 09:53:35.981 INFO [stderr] 
Nov 30 09:53:35.981 INFO [stderr] warning: field is never used: `thread`
Nov 30 09:53:35.981 INFO [stderr]   --> src/lib.rs:50:5
Nov 30 09:53:35.981 INFO [stderr]    |
Nov 30 09:53:35.981 INFO [stderr] 50 |     thread: thread::JoinHandle<()>,
Nov 30 09:53:35.981 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 30 09:53:35.981 INFO [stderr] 
Nov 30 09:53:36.592 INFO [stderr] warning: field is never used: `workers`
Nov 30 09:53:36.592 INFO [stderr]  --> src/lib.rs:7:5
Nov 30 09:53:36.592 INFO [stderr]   |
Nov 30 09:53:36.592 INFO [stderr] 7 |     workers: Vec<Worker>,
Nov 30 09:53:36.592 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
Nov 30 09:53:36.592 INFO [stderr]   |
Nov 30 09:53:36.592 INFO [stderr]   = note: #[warn(dead_code)] on by default
Nov 30 09:53:36.592 INFO [stderr] 
Nov 30 09:53:36.593 INFO [stderr] warning: field is never used: `id`
Nov 30 09:53:36.593 INFO [stderr]   --> src/lib.rs:49:5
Nov 30 09:53:36.593 INFO [stderr]    |
Nov 30 09:53:36.593 INFO [stderr] 49 |     id: usize,
Nov 30 09:53:36.593 INFO [stderr]    |     ^^^^^^^^^
Nov 30 09:53:36.593 INFO [stderr] 
Nov 30 09:53:36.593 INFO [stderr] warning: field is never used: `thread`
Nov 30 09:53:36.593 INFO [stderr]   --> src/lib.rs:50:5
Nov 30 09:53:36.593 INFO [stderr]    |
Nov 30 09:53:36.593 INFO [stderr] 50 |     thread: thread::JoinHandle<()>,
Nov 30 09:53:36.593 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 30 09:53:36.593 INFO [stderr] 
Nov 30 09:53:37.127 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.86s
Nov 30 09:53:37.129 INFO [stderr] su: No module specific data is present
Nov 30 09:53:38.072 INFO running `"docker" "inspect" "7ab3f800ab470d8d0bad73c2cb9512226e5d1623211ab33c77ce40c28ae6440a"`
Nov 30 09:53:38.294 INFO running `"docker" "rm" "-f" "7ab3f800ab470d8d0bad73c2cb9512226e5d1623211ab33c77ce40c28ae6440a"`
Nov 30 09:53:38.563 INFO [stdout] 7ab3f800ab470d8d0bad73c2cb9512226e5d1623211ab33c77ce40c28ae6440a