Dec 17 10:55:48.314 INFO checking zhenhuanlee/simple_server against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 17 10:55:48.314 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-6/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/gh/zhenhuanlee/simple_server:/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 17 10:55:48.766 INFO [stdout] 3b2f669c09a01c6a6655e929ee48d6b53b69e58c40b98869b27b1949b8e3372e
Dec 17 10:55:48.770 INFO running `"docker" "start" "-a" "3b2f669c09a01c6a6655e929ee48d6b53b69e58c40b98869b27b1949b8e3372e"`
Dec 17 10:55:50.636 INFO [stderr]     Checking simple_server v0.1.0 (/opt/crater/workdir)
Dec 17 10:55:50.899 INFO [stderr] warning: field is never used: `workers`
Dec 17 10:55:50.899 INFO [stderr]  --> src/hello/lib.rs:8:3
Dec 17 10:55:50.899 INFO [stderr]   |
Dec 17 10:55:50.899 INFO [stderr] 8 |   workers: Vec<Worker>,
Dec 17 10:55:50.899 INFO [stderr]   |   ^^^^^^^^^^^^^^^^^^^^
Dec 17 10:55:50.899 INFO [stderr]   |
Dec 17 10:55:50.899 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 17 10:55:50.899 INFO [stderr] 
Dec 17 10:55:50.899 INFO [stderr] warning: field is never used: `id`
Dec 17 10:55:50.900 INFO [stderr]   --> src/hello/lib.rs:15:3
Dec 17 10:55:50.900 INFO [stderr]    |
Dec 17 10:55:50.900 INFO [stderr] 15 |   id: usize,
Dec 17 10:55:50.900 INFO [stderr]    |   ^^^^^^^^^
Dec 17 10:55:50.900 INFO [stderr] 
Dec 17 10:55:50.900 INFO [stderr] warning: field is never used: `thread`
Dec 17 10:55:50.900 INFO [stderr]   --> src/hello/lib.rs:16:3
Dec 17 10:55:50.900 INFO [stderr]    |
Dec 17 10:55:50.900 INFO [stderr] 16 |   thread: thread::JoinHandle<()>,
Dec 17 10:55:50.900 INFO [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 10:55:50.900 INFO [stderr] 
Dec 17 10:55:50.944 INFO [stderr] warning: field is never used: `workers`
Dec 17 10:55:50.944 INFO [stderr]  --> src/hello/lib.rs:8:3
Dec 17 10:55:50.944 INFO [stderr]   |
Dec 17 10:55:50.944 INFO [stderr] 8 |   workers: Vec<Worker>,
Dec 17 10:55:50.944 INFO [stderr]   |   ^^^^^^^^^^^^^^^^^^^^
Dec 17 10:55:50.944 INFO [stderr]   |
Dec 17 10:55:50.944 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 17 10:55:50.944 INFO [stderr] 
Dec 17 10:55:50.944 INFO [stderr] warning: field is never used: `id`
Dec 17 10:55:50.944 INFO [stderr]   --> src/hello/lib.rs:15:3
Dec 17 10:55:50.944 INFO [stderr]    |
Dec 17 10:55:50.944 INFO [stderr] 15 |   id: usize,
Dec 17 10:55:50.944 INFO [stderr]    |   ^^^^^^^^^
Dec 17 10:55:50.944 INFO [stderr] 
Dec 17 10:55:50.944 INFO [stderr] warning: field is never used: `thread`
Dec 17 10:55:50.944 INFO [stderr]   --> src/hello/lib.rs:16:3
Dec 17 10:55:50.944 INFO [stderr]    |
Dec 17 10:55:50.944 INFO [stderr] 16 |   thread: thread::JoinHandle<()>,
Dec 17 10:55:50.944 INFO [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 10:55:50.944 INFO [stderr] 
Dec 17 10:55:51.380 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.78s
Dec 17 10:55:52.490 INFO running `"docker" "inspect" "3b2f669c09a01c6a6655e929ee48d6b53b69e58c40b98869b27b1949b8e3372e"`
Dec 17 10:55:52.770 INFO running `"docker" "rm" "-f" "3b2f669c09a01c6a6655e929ee48d6b53b69e58c40b98869b27b1949b8e3372e"`
Dec 17 10:55:53.085 INFO [stdout] 3b2f669c09a01c6a6655e929ee48d6b53b69e58c40b98869b27b1949b8e3372e