Dec 11 05:07:59.457 INFO checking zhenhuanlee/simple_server against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 11 05:07:59.457 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-0/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-0/pr-56677/master#3a75e80557a103497cffbcab395a2f37061a77ea:/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 +3a75e80557a103497cffbcab395a2f37061a77ea-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 11 05:07:59.884 INFO [stdout] 31e0754ae4a7af455d9516618593e0dc936cbad11c1398bfd7a5fc876247f04d
Dec 11 05:07:59.890 INFO running `"docker" "start" "-a" "31e0754ae4a7af455d9516618593e0dc936cbad11c1398bfd7a5fc876247f04d"`
Dec 11 05:08:00.847 INFO [stderr] usermod: no changes
Dec 11 05:08:00.900 INFO [stderr]     Checking simple_server v0.1.0 (/source)
Dec 11 05:08:01.076 INFO [stderr] warning: field is never used: `workers`
Dec 11 05:08:01.076 INFO [stderr]  --> src/hello/lib.rs:8:3
Dec 11 05:08:01.076 INFO [stderr]   |
Dec 11 05:08:01.076 INFO [stderr] 8 |   workers: Vec<Worker>,
Dec 11 05:08:01.076 INFO [stderr]   |   ^^^^^^^^^^^^^^^^^^^^
Dec 11 05:08:01.076 INFO [stderr]   |
Dec 11 05:08:01.076 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 11 05:08:01.076 INFO [stderr] 
Dec 11 05:08:01.076 INFO [stderr] warning: field is never used: `id`
Dec 11 05:08:01.076 INFO [stderr]   --> src/hello/lib.rs:15:3
Dec 11 05:08:01.076 INFO [stderr]    |
Dec 11 05:08:01.076 INFO [stderr] 15 |   id: usize,
Dec 11 05:08:01.076 INFO [stderr]    |   ^^^^^^^^^
Dec 11 05:08:01.076 INFO [stderr] 
Dec 11 05:08:01.077 INFO [stderr] warning: field is never used: `thread`
Dec 11 05:08:01.077 INFO [stderr]   --> src/hello/lib.rs:16:3
Dec 11 05:08:01.077 INFO [stderr]    |
Dec 11 05:08:01.077 INFO [stderr] 16 |   thread: thread::JoinHandle<()>,
Dec 11 05:08:01.077 INFO [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 05:08:01.077 INFO [stderr] 
Dec 11 05:08:01.077 INFO [stderr] warning: field is never used: `workers`
Dec 11 05:08:01.077 INFO [stderr]  --> src/hello/lib.rs:8:3
Dec 11 05:08:01.077 INFO [stderr]   |
Dec 11 05:08:01.077 INFO [stderr] 8 |   workers: Vec<Worker>,
Dec 11 05:08:01.077 INFO [stderr]   |   ^^^^^^^^^^^^^^^^^^^^
Dec 11 05:08:01.077 INFO [stderr]   |
Dec 11 05:08:01.077 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 11 05:08:01.077 INFO [stderr] 
Dec 11 05:08:01.077 INFO [stderr] warning: field is never used: `id`
Dec 11 05:08:01.077 INFO [stderr]   --> src/hello/lib.rs:15:3
Dec 11 05:08:01.077 INFO [stderr]    |
Dec 11 05:08:01.077 INFO [stderr] 15 |   id: usize,
Dec 11 05:08:01.077 INFO [stderr]    |   ^^^^^^^^^
Dec 11 05:08:01.077 INFO [stderr] 
Dec 11 05:08:01.077 INFO [stderr] warning: field is never used: `thread`
Dec 11 05:08:01.077 INFO [stderr]   --> src/hello/lib.rs:16:3
Dec 11 05:08:01.077 INFO [stderr]    |
Dec 11 05:08:01.077 INFO [stderr] 16 |   thread: thread::JoinHandle<()>,
Dec 11 05:08:01.077 INFO [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 05:08:01.077 INFO [stderr] 
Dec 11 05:08:01.399 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.53s
Dec 11 05:08:01.399 INFO [stderr] su: No module specific data is present
Dec 11 05:08:01.767 INFO running `"docker" "inspect" "31e0754ae4a7af455d9516618593e0dc936cbad11c1398bfd7a5fc876247f04d"`
Dec 11 05:08:01.898 INFO running `"docker" "rm" "-f" "31e0754ae4a7af455d9516618593e0dc936cbad11c1398bfd7a5fc876247f04d"`
Dec 11 05:08:02.016 INFO [stdout] 31e0754ae4a7af455d9516618593e0dc936cbad11c1398bfd7a5fc876247f04d