Oct 13 15:26:12.496 INFO checking fast_io-1.2.2 against try#4021bd0b3c5815b087d6db10ce461e7e4854ade7 for pr-54977
Oct 13 15:26:12.498 INFO running `"docker" "create" "-v" "/mnt/big/crater/./work/local/target-dirs/pr-54977/worker-1/try#4021bd0b3c5815b087d6db10ce461e7e4854ade7:/target:rw,Z" "-v" "/mnt/big/crater/./work/local/test-source/worker-1/pr-54977/try#4021bd0b3c5815b087d6db10ce461e7e4854ade7:/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 +4021bd0b3c5815b087d6db10ce461e7e4854ade7-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"`
Oct 13 15:26:13.014 INFO blam! 75617f89df1da0f9699908db7c37679c897eca2e9c790b709cbcaf516fc42bfd
Oct 13 15:26:13.016 INFO running `"docker" "start" "-a" "75617f89df1da0f9699908db7c37679c897eca2e9c790b709cbcaf516fc42bfd"`
Oct 13 15:26:14.342 INFO kablam! usermod: no changes
Oct 13 15:26:14.405 INFO kablam!     Checking fast_io v1.2.2 (/source)
Oct 13 15:26:15.476 INFO kablam! warning: variable does not need to be mutable
Oct 13 15:26:15.476 INFO kablam!   --> src/copy_io.rs:17:13
Oct 13 15:26:15.476 INFO kablam!    |
Oct 13 15:26:15.476 INFO kablam! 17 |         let mut buffer = unsafe {
Oct 13 15:26:15.476 INFO kablam!    |             ----^^^^^^
Oct 13 15:26:15.476 INFO kablam!    |             |
Oct 13 15:26:15.476 INFO kablam!    |             help: remove this `mut`
Oct 13 15:26:15.476 INFO kablam!    |
Oct 13 15:26:15.476 INFO kablam!    = note: #[warn(unused_mut)] on by default
Oct 13 15:26:15.476 INFO kablam! 
Oct 13 15:26:15.476 INFO kablam! warning: variable does not need to be mutable
Oct 13 15:26:15.476 INFO kablam!   --> src/copy_io.rs:38:17
Oct 13 15:26:15.476 INFO kablam!    |
Oct 13 15:26:15.476 INFO kablam! 38 |             let mut buffer = slice::from_raw_parts_mut(
Oct 13 15:26:15.476 INFO kablam!    |                 ----^^^^^^
Oct 13 15:26:15.476 INFO kablam!    |                 |
Oct 13 15:26:15.476 INFO kablam!    |                 help: remove this `mut`
Oct 13 15:26:15.476 INFO kablam! 
Oct 13 15:26:15.520 INFO kablam! warning: variable does not need to be mutable
Oct 13 15:26:15.520 INFO kablam!   --> src/copy_io.rs:17:13
Oct 13 15:26:15.520 INFO kablam!    |
Oct 13 15:26:15.520 INFO kablam! 17 |         let mut buffer = unsafe {
Oct 13 15:26:15.520 INFO kablam!    |             ----^^^^^^
Oct 13 15:26:15.520 INFO kablam!    |             |
Oct 13 15:26:15.520 INFO kablam!    |             help: remove this `mut`
Oct 13 15:26:15.520 INFO kablam!    |
Oct 13 15:26:15.520 INFO kablam!    = note: #[warn(unused_mut)] on by default
Oct 13 15:26:15.520 INFO kablam! 
Oct 13 15:26:15.520 INFO kablam! warning: variable does not need to be mutable
Oct 13 15:26:15.520 INFO kablam!   --> src/copy_io.rs:38:17
Oct 13 15:26:15.520 INFO kablam!    |
Oct 13 15:26:15.520 INFO kablam! 38 |             let mut buffer = slice::from_raw_parts_mut(
Oct 13 15:26:15.520 INFO kablam!    |                 ----^^^^^^
Oct 13 15:26:15.520 INFO kablam!    |                 |
Oct 13 15:26:15.520 INFO kablam!    |                 help: remove this `mut`
Oct 13 15:26:15.520 INFO kablam! 
Oct 13 15:26:15.584 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 1.20s
Oct 13 15:26:15.584 INFO kablam! su: No module specific data is present
Oct 13 15:26:16.526 INFO running `"docker" "rm" "-f" "75617f89df1da0f9699908db7c37679c897eca2e9c790b709cbcaf516fc42bfd"`
Oct 13 15:26:16.816 INFO blam! 75617f89df1da0f9699908db7c37679c897eca2e9c790b709cbcaf516fc42bfd