Dec 12 15:11:26.641 INFO checking fast_io-1.2.2 against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 12 15:11:26.641 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-2/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-2/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 12 15:11:26.972 INFO [stdout] dae721ade1b836a61f000f25aa50cebdc95d3a4d8c9dda4f5f2cc17e35f0c32f
Dec 12 15:11:26.979 INFO running `"docker" "start" "-a" "dae721ade1b836a61f000f25aa50cebdc95d3a4d8c9dda4f5f2cc17e35f0c32f"`
Dec 12 15:11:28.178 INFO [stderr] usermod: no changes
Dec 12 15:11:28.236 INFO [stderr]     Checking fast_io v1.2.2 (/source)
Dec 12 15:11:28.976 INFO [stderr] warning: variable does not need to be mutable
Dec 12 15:11:28.976 INFO [stderr]   --> src/copy_io.rs:17:13
Dec 12 15:11:28.976 INFO [stderr]    |
Dec 12 15:11:28.976 INFO [stderr] 17 |         let mut buffer = unsafe {
Dec 12 15:11:28.976 INFO [stderr]    |             ----^^^^^^
Dec 12 15:11:28.976 INFO [stderr]    |             |
Dec 12 15:11:28.976 INFO [stderr]    |             help: remove this `mut`
Dec 12 15:11:28.976 INFO [stderr]    |
Dec 12 15:11:28.976 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 15:11:28.976 INFO [stderr] 
Dec 12 15:11:28.976 INFO [stderr] warning: variable does not need to be mutable
Dec 12 15:11:28.976 INFO [stderr]   --> src/copy_io.rs:38:17
Dec 12 15:11:28.976 INFO [stderr]    |
Dec 12 15:11:28.976 INFO [stderr] 38 |             let mut buffer = slice::from_raw_parts_mut(
Dec 12 15:11:28.976 INFO [stderr]    |                 ----^^^^^^
Dec 12 15:11:28.977 INFO [stderr]    |                 |
Dec 12 15:11:28.977 INFO [stderr]    |                 help: remove this `mut`
Dec 12 15:11:28.977 INFO [stderr] 
Dec 12 15:11:29.336 INFO [stderr] warning: variable does not need to be mutable
Dec 12 15:11:29.336 INFO [stderr]   --> src/copy_io.rs:17:13
Dec 12 15:11:29.336 INFO [stderr]    |
Dec 12 15:11:29.336 INFO [stderr] 17 |         let mut buffer = unsafe {
Dec 12 15:11:29.336 INFO [stderr]    |             ----^^^^^^
Dec 12 15:11:29.336 INFO [stderr]    |             |
Dec 12 15:11:29.336 INFO [stderr]    |             help: remove this `mut`
Dec 12 15:11:29.336 INFO [stderr]    |
Dec 12 15:11:29.336 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 15:11:29.336 INFO [stderr] 
Dec 12 15:11:29.344 INFO [stderr] warning: variable does not need to be mutable
Dec 12 15:11:29.344 INFO [stderr]   --> src/copy_io.rs:38:17
Dec 12 15:11:29.344 INFO [stderr]    |
Dec 12 15:11:29.344 INFO [stderr] 38 |             let mut buffer = slice::from_raw_parts_mut(
Dec 12 15:11:29.344 INFO [stderr]    |                 ----^^^^^^
Dec 12 15:11:29.344 INFO [stderr]    |                 |
Dec 12 15:11:29.344 INFO [stderr]    |                 help: remove this `mut`
Dec 12 15:11:29.344 INFO [stderr] 
Dec 12 15:11:29.368 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.16s
Dec 12 15:11:29.368 INFO [stderr] su: No module specific data is present
Dec 12 15:11:30.043 INFO running `"docker" "inspect" "dae721ade1b836a61f000f25aa50cebdc95d3a4d8c9dda4f5f2cc17e35f0c32f"`
Dec 12 15:11:30.364 INFO running `"docker" "rm" "-f" "dae721ade1b836a61f000f25aa50cebdc95d3a4d8c9dda4f5f2cc17e35f0c32f"`
Dec 12 15:11:30.616 INFO [stdout] dae721ade1b836a61f000f25aa50cebdc95d3a4d8c9dda4f5f2cc17e35f0c32f