Dec 18 16:35:20.692 INFO checking fast_io-1.2.2 against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 16:35:20.692 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-4/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/reg/fast_io/1.2.2:/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" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 16:35:20.915 INFO [stdout] 47edd3805fa0cd0ec506efe659550765a9bf0e70615c88c73b3f040ee182cbc1
Dec 18 16:35:20.918 INFO running `"docker" "start" "-a" "47edd3805fa0cd0ec506efe659550765a9bf0e70615c88c73b3f040ee182cbc1"`
Dec 18 16:35:21.556 INFO [stderr]     Checking fast_io v1.2.2 (/opt/crater/workdir)
Dec 18 16:35:21.876 INFO [stderr] warning: variable does not need to be mutable
Dec 18 16:35:21.876 INFO [stderr]   --> src/copy_io.rs:17:13
Dec 18 16:35:21.876 INFO [stderr]    |
Dec 18 16:35:21.876 INFO [stderr] 17 |         let mut buffer = unsafe {
Dec 18 16:35:21.876 INFO [stderr]    |             ----^^^^^^
Dec 18 16:35:21.876 INFO [stderr]    |             |
Dec 18 16:35:21.876 INFO [stderr]    |             help: remove this `mut`
Dec 18 16:35:21.876 INFO [stderr]    |
Dec 18 16:35:21.876 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 16:35:21.876 INFO [stderr] 
Dec 18 16:35:21.876 INFO [stderr] warning: variable does not need to be mutable
Dec 18 16:35:21.876 INFO [stderr]   --> src/copy_io.rs:38:17
Dec 18 16:35:21.877 INFO [stderr]    |
Dec 18 16:35:21.877 INFO [stderr] 38 |             let mut buffer = slice::from_raw_parts_mut(
Dec 18 16:35:21.877 INFO [stderr]    |                 ----^^^^^^
Dec 18 16:35:21.877 INFO [stderr]    |                 |
Dec 18 16:35:21.877 INFO [stderr]    |                 help: remove this `mut`
Dec 18 16:35:21.877 INFO [stderr] 
Dec 18 16:35:22.032 INFO [stderr] warning: variable does not need to be mutable
Dec 18 16:35:22.032 INFO [stderr]   --> src/copy_io.rs:17:13
Dec 18 16:35:22.032 INFO [stderr]    |
Dec 18 16:35:22.032 INFO [stderr] 17 |         let mut buffer = unsafe {
Dec 18 16:35:22.032 INFO [stderr]    |             ----^^^^^^
Dec 18 16:35:22.032 INFO [stderr]    |             |
Dec 18 16:35:22.032 INFO [stderr]    |             help: remove this `mut`
Dec 18 16:35:22.032 INFO [stderr]    |
Dec 18 16:35:22.032 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 16:35:22.032 INFO [stderr] 
Dec 18 16:35:22.034 INFO [stderr] warning: variable does not need to be mutable
Dec 18 16:35:22.034 INFO [stderr]   --> src/copy_io.rs:38:17
Dec 18 16:35:22.034 INFO [stderr]    |
Dec 18 16:35:22.034 INFO [stderr] 38 |             let mut buffer = slice::from_raw_parts_mut(
Dec 18 16:35:22.034 INFO [stderr]    |                 ----^^^^^^
Dec 18 16:35:22.034 INFO [stderr]    |                 |
Dec 18 16:35:22.034 INFO [stderr]    |                 help: remove this `mut`
Dec 18 16:35:22.034 INFO [stderr] 
Dec 18 16:35:22.056 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.54s
Dec 18 16:35:22.257 INFO running `"docker" "inspect" "47edd3805fa0cd0ec506efe659550765a9bf0e70615c88c73b3f040ee182cbc1"`
Dec 18 16:35:22.338 INFO running `"docker" "rm" "-f" "47edd3805fa0cd0ec506efe659550765a9bf0e70615c88c73b3f040ee182cbc1"`
Dec 18 16:35:22.459 INFO [stdout] 47edd3805fa0cd0ec506efe659550765a9bf0e70615c88c73b3f040ee182cbc1