Dec 05 13:57:28.653 INFO checking fast_io-1.2.2 against master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc for pr-56481
Dec 05 13:57:28.653 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-5/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-5/pr-56481/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/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 +c8ae2de8363be088604ffa2ccba84ff7ad7250bc-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 05 13:57:29.131 INFO [stdout] 72cf5e29d27bba47f5471f5d324d09292b28a23a5b30570f49ce7b22670370d7
Dec 05 13:57:29.136 INFO running `"docker" "start" "-a" "72cf5e29d27bba47f5471f5d324d09292b28a23a5b30570f49ce7b22670370d7"`
Dec 05 13:57:30.891 INFO [stderr] usermod: no changes
Dec 05 13:57:30.937 INFO [stderr]     Checking fast_io v1.2.2 (/source)
Dec 05 13:57:31.863 INFO [stderr] warning: variable does not need to be mutable
Dec 05 13:57:31.863 INFO [stderr]   --> src/copy_io.rs:17:13
Dec 05 13:57:31.863 INFO [stderr]    |
Dec 05 13:57:31.863 INFO [stderr] 17 |         let mut buffer = unsafe {
Dec 05 13:57:31.863 INFO [stderr]    |             ----^^^^^^
Dec 05 13:57:31.863 INFO [stderr]    |             |
Dec 05 13:57:31.863 INFO [stderr]    |             help: remove this `mut`
Dec 05 13:57:31.863 INFO [stderr]    |
Dec 05 13:57:31.863 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 05 13:57:31.863 INFO [stderr] 
Dec 05 13:57:31.863 INFO [stderr] warning: variable does not need to be mutable
Dec 05 13:57:31.863 INFO [stderr]   --> src/copy_io.rs:38:17
Dec 05 13:57:31.863 INFO [stderr]    |
Dec 05 13:57:31.863 INFO [stderr] 38 |             let mut buffer = slice::from_raw_parts_mut(
Dec 05 13:57:31.863 INFO [stderr]    |                 ----^^^^^^
Dec 05 13:57:31.863 INFO [stderr]    |                 |
Dec 05 13:57:31.863 INFO [stderr]    |                 help: remove this `mut`
Dec 05 13:57:31.863 INFO [stderr] 
Dec 05 13:57:32.215 INFO [stderr] warning: variable does not need to be mutable
Dec 05 13:57:32.215 INFO [stderr]   --> src/copy_io.rs:17:13
Dec 05 13:57:32.215 INFO [stderr]    |
Dec 05 13:57:32.215 INFO [stderr] 17 |         let mut buffer = unsafe {
Dec 05 13:57:32.215 INFO [stderr]    |             ----^^^^^^
Dec 05 13:57:32.215 INFO [stderr]    |             |
Dec 05 13:57:32.215 INFO [stderr]    |             help: remove this `mut`
Dec 05 13:57:32.215 INFO [stderr]    |
Dec 05 13:57:32.215 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 05 13:57:32.215 INFO [stderr] 
Dec 05 13:57:32.215 INFO [stderr] warning: variable does not need to be mutable
Dec 05 13:57:32.215 INFO [stderr]   --> src/copy_io.rs:38:17
Dec 05 13:57:32.215 INFO [stderr]    |
Dec 05 13:57:32.215 INFO [stderr] 38 |             let mut buffer = slice::from_raw_parts_mut(
Dec 05 13:57:32.215 INFO [stderr]    |                 ----^^^^^^
Dec 05 13:57:32.215 INFO [stderr]    |                 |
Dec 05 13:57:32.215 INFO [stderr]    |                 help: remove this `mut`
Dec 05 13:57:32.215 INFO [stderr] 
Dec 05 13:57:32.243 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.32s
Dec 05 13:57:32.251 INFO [stderr] su: No module specific data is present
Dec 05 13:57:32.953 INFO running `"docker" "inspect" "72cf5e29d27bba47f5471f5d324d09292b28a23a5b30570f49ce7b22670370d7"`
Dec 05 13:57:33.267 INFO running `"docker" "rm" "-f" "72cf5e29d27bba47f5471f5d324d09292b28a23a5b30570f49ce7b22670370d7"`
Dec 05 13:57:33.591 INFO [stdout] 72cf5e29d27bba47f5471f5d324d09292b28a23a5b30570f49ce7b22670370d7