Dec 04 06:06:00.189 INFO checking zhenhuanlee/simple_server against try#1df97983eb2057dc6a8f7eb364e263b51ae23230 for pr-56481
Dec 04 06:06:00.190 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-6/try#1df97983eb2057dc6a8f7eb364e263b51ae23230:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/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 04 06:06:00.804 INFO [stdout] f7c84cf897aba14d92d69e8518a04dfd04a5c804c5497a2928c35358e3a6df28
Dec 04 06:06:00.806 INFO running `"docker" "start" "-a" "f7c84cf897aba14d92d69e8518a04dfd04a5c804c5497a2928c35358e3a6df28"`
Dec 04 06:06:02.621 INFO [stderr] usermod: no changes
Dec 04 06:06:02.663 INFO [stderr]     Checking simple_server v0.1.0 (/source)
Dec 04 06:06:02.923 INFO [stderr] warning: field is never used: `workers`
Dec 04 06:06:02.923 INFO [stderr]  --> src/hello/lib.rs:8:3
Dec 04 06:06:02.923 INFO [stderr]   |
Dec 04 06:06:02.923 INFO [stderr] 8 |   workers: Vec<Worker>,
Dec 04 06:06:02.923 INFO [stderr]   |   ^^^^^^^^^^^^^^^^^^^^
Dec 04 06:06:02.923 INFO [stderr]   |
Dec 04 06:06:02.923 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 04 06:06:02.923 INFO [stderr] 
Dec 04 06:06:02.923 INFO [stderr] warning: field is never used: `id`
Dec 04 06:06:02.923 INFO [stderr]   --> src/hello/lib.rs:15:3
Dec 04 06:06:02.923 INFO [stderr]    |
Dec 04 06:06:02.923 INFO [stderr] 15 |   id: usize,
Dec 04 06:06:02.923 INFO [stderr]    |   ^^^^^^^^^
Dec 04 06:06:02.923 INFO [stderr] 
Dec 04 06:06:02.923 INFO [stderr] warning: field is never used: `thread`
Dec 04 06:06:02.923 INFO [stderr]   --> src/hello/lib.rs:16:3
Dec 04 06:06:02.923 INFO [stderr]    |
Dec 04 06:06:02.923 INFO [stderr] 16 |   thread: thread::JoinHandle<()>,
Dec 04 06:06:02.923 INFO [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 04 06:06:02.923 INFO [stderr] 
Dec 04 06:06:03.015 INFO [stderr] warning: field is never used: `workers`
Dec 04 06:06:03.015 INFO [stderr]  --> src/hello/lib.rs:8:3
Dec 04 06:06:03.015 INFO [stderr]   |
Dec 04 06:06:03.016 INFO [stderr] 8 |   workers: Vec<Worker>,
Dec 04 06:06:03.016 INFO [stderr]   |   ^^^^^^^^^^^^^^^^^^^^
Dec 04 06:06:03.016 INFO [stderr]   |
Dec 04 06:06:03.016 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 04 06:06:03.016 INFO [stderr] 
Dec 04 06:06:03.016 INFO [stderr] warning: field is never used: `id`
Dec 04 06:06:03.016 INFO [stderr]   --> src/hello/lib.rs:15:3
Dec 04 06:06:03.016 INFO [stderr]    |
Dec 04 06:06:03.016 INFO [stderr] 15 |   id: usize,
Dec 04 06:06:03.016 INFO [stderr]    |   ^^^^^^^^^
Dec 04 06:06:03.016 INFO [stderr] 
Dec 04 06:06:03.016 INFO [stderr] warning: field is never used: `thread`
Dec 04 06:06:03.016 INFO [stderr]   --> src/hello/lib.rs:16:3
Dec 04 06:06:03.016 INFO [stderr]    |
Dec 04 06:06:03.016 INFO [stderr] 16 |   thread: thread::JoinHandle<()>,
Dec 04 06:06:03.016 INFO [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 04 06:06:03.016 INFO [stderr] 
Dec 04 06:06:03.363 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.72s
Dec 04 06:06:03.363 INFO [stderr] su: No module specific data is present
Dec 04 06:06:04.059 INFO running `"docker" "inspect" "f7c84cf897aba14d92d69e8518a04dfd04a5c804c5497a2928c35358e3a6df28"`
Dec 04 06:06:04.331 INFO running `"docker" "rm" "-f" "f7c84cf897aba14d92d69e8518a04dfd04a5c804c5497a2928c35358e3a6df28"`
Dec 04 06:06:04.603 INFO [stdout] f7c84cf897aba14d92d69e8518a04dfd04a5c804c5497a2928c35358e3a6df28