Dec 18 09:08:59.734 INFO checking x-923-0.1.2 against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 09:08:59.734 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-0/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/reg/x-923/0.1.2:/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" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 09:09:00.121 INFO [stdout] 481d38a246dc7e25a6bf8148f044940cd6f3030267634589d96308cf8e989ed4
Dec 18 09:09:00.123 INFO running `"docker" "start" "-a" "481d38a246dc7e25a6bf8148f044940cd6f3030267634589d96308cf8e989ed4"`
Dec 18 09:09:01.252 INFO [stderr]     Checking x-923 v0.1.2 (/opt/crater/workdir)
Dec 18 09:09:01.706 INFO [stderr] warning: variable does not need to be mutable
Dec 18 09:09:01.706 INFO [stderr]   --> src/lib.rs:20:19
Dec 18 09:09:01.706 INFO [stderr]    |
Dec 18 09:09:01.706 INFO [stderr] 20 | pub fn pad_buffer(mut buffer: &mut Vec<u8>, block_size: u8) {
Dec 18 09:09:01.707 INFO [stderr]    |                   ----^^^^^^
Dec 18 09:09:01.707 INFO [stderr]    |                   |
Dec 18 09:09:01.707 INFO [stderr]    |                   help: remove this `mut`
Dec 18 09:09:01.707 INFO [stderr]    |
Dec 18 09:09:01.708 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 09:09:01.708 INFO [stderr] 
Dec 18 09:09:01.709 INFO [stderr] warning: variable does not need to be mutable
Dec 18 09:09:01.709 INFO [stderr]   --> src/lib.rs:31:22
Dec 18 09:09:01.709 INFO [stderr]    |
Dec 18 09:09:01.710 INFO [stderr] 31 | pub fn un_pad_buffer(mut buffer: &mut Vec<u8>) {
Dec 18 09:09:01.710 INFO [stderr]    |                      ----^^^^^^
Dec 18 09:09:01.710 INFO [stderr]    |                      |
Dec 18 09:09:01.710 INFO [stderr]    |                      help: remove this `mut`
Dec 18 09:09:01.710 INFO [stderr] 
Dec 18 09:09:01.852 INFO [stderr] warning: variable does not need to be mutable
Dec 18 09:09:01.852 INFO [stderr]   --> src/lib.rs:20:19
Dec 18 09:09:01.852 INFO [stderr]    |
Dec 18 09:09:01.852 INFO [stderr] 20 | pub fn pad_buffer(mut buffer: &mut Vec<u8>, block_size: u8) {
Dec 18 09:09:01.852 INFO [stderr]    |                   ----^^^^^^
Dec 18 09:09:01.852 INFO [stderr]    |                   |
Dec 18 09:09:01.852 INFO [stderr]    |                   help: remove this `mut`
Dec 18 09:09:01.852 INFO [stderr]    |
Dec 18 09:09:01.852 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 09:09:01.852 INFO [stderr] 
Dec 18 09:09:01.856 INFO [stderr] warning: variable does not need to be mutable
Dec 18 09:09:01.856 INFO [stderr]   --> src/lib.rs:31:22
Dec 18 09:09:01.856 INFO [stderr]    |
Dec 18 09:09:01.856 INFO [stderr] 31 | pub fn un_pad_buffer(mut buffer: &mut Vec<u8>) {
Dec 18 09:09:01.856 INFO [stderr]    |                      ----^^^^^^
Dec 18 09:09:01.856 INFO [stderr]    |                      |
Dec 18 09:09:01.856 INFO [stderr]    |                      help: remove this `mut`
Dec 18 09:09:01.856 INFO [stderr] 
Dec 18 09:09:02.129 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.91s
Dec 18 09:09:02.650 INFO running `"docker" "inspect" "481d38a246dc7e25a6bf8148f044940cd6f3030267634589d96308cf8e989ed4"`
Dec 18 09:09:02.714 INFO running `"docker" "rm" "-f" "481d38a246dc7e25a6bf8148f044940cd6f3030267634589d96308cf8e989ed4"`
Dec 18 09:09:02.802 INFO [stdout] 481d38a246dc7e25a6bf8148f044940cd6f3030267634589d96308cf8e989ed4