Dec 18 08:23:11.179 INFO checking Bkindmonk/RustPractice against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 08:23:11.179 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/gh/Bkindmonk/RustPractice:/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 08:23:11.706 INFO [stdout] e8bd1736ec3fdcfbf1f8d0d0c1c4ab94f14796f339f8a7ed4313f775ce28059d
Dec 18 08:23:11.708 INFO running `"docker" "start" "-a" "e8bd1736ec3fdcfbf1f8d0d0c1c4ab94f14796f339f8a7ed4313f775ce28059d"`
Dec 18 08:23:13.424 INFO [stderr]     Checking mergesort v0.1.0 (/opt/crater/workdir)
Dec 18 08:23:13.996 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:23:13.996 INFO [stderr]   --> src/main.rs:91:13
Dec 18 08:23:13.996 INFO [stderr]    |
Dec 18 08:23:13.996 INFO [stderr] 91 |         let mut realhalves = (*real).split_at_mut(halflength);
Dec 18 08:23:13.996 INFO [stderr]    |             ----^^^^^^^^^^
Dec 18 08:23:13.996 INFO [stderr]    |             |
Dec 18 08:23:13.996 INFO [stderr]    |             help: remove this `mut`
Dec 18 08:23:13.996 INFO [stderr]    |
Dec 18 08:23:13.996 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 08:23:13.996 INFO [stderr] 
Dec 18 08:23:13.996 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:23:13.996 INFO [stderr]   --> src/main.rs:92:13
Dec 18 08:23:13.996 INFO [stderr]    |
Dec 18 08:23:13.996 INFO [stderr] 92 |         let mut scratchhalves = (*scratch).split_at_mut(halflength);
Dec 18 08:23:13.996 INFO [stderr]    |             ----^^^^^^^^^^^^^
Dec 18 08:23:13.996 INFO [stderr]    |             |
Dec 18 08:23:13.996 INFO [stderr]    |             help: remove this `mut`
Dec 18 08:23:13.996 INFO [stderr] 
Dec 18 08:23:14.076 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:23:14.076 INFO [stderr]   --> src/main.rs:91:13
Dec 18 08:23:14.076 INFO [stderr]    |
Dec 18 08:23:14.076 INFO [stderr] 91 |         let mut realhalves = (*real).split_at_mut(halflength);
Dec 18 08:23:14.076 INFO [stderr]    |             ----^^^^^^^^^^
Dec 18 08:23:14.076 INFO [stderr]    |             |
Dec 18 08:23:14.076 INFO [stderr]    |             help: remove this `mut`
Dec 18 08:23:14.076 INFO [stderr]    |
Dec 18 08:23:14.076 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 08:23:14.076 INFO [stderr] 
Dec 18 08:23:14.076 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:23:14.076 INFO [stderr]   --> src/main.rs:92:13
Dec 18 08:23:14.076 INFO [stderr]    |
Dec 18 08:23:14.076 INFO [stderr] 92 |         let mut scratchhalves = (*scratch).split_at_mut(halflength);
Dec 18 08:23:14.076 INFO [stderr]    |             ----^^^^^^^^^^^^^
Dec 18 08:23:14.076 INFO [stderr]    |             |
Dec 18 08:23:14.076 INFO [stderr]    |             help: remove this `mut`
Dec 18 08:23:14.076 INFO [stderr] 
Dec 18 08:23:14.114 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.74s
Dec 18 08:23:14.806 INFO running `"docker" "inspect" "e8bd1736ec3fdcfbf1f8d0d0c1c4ab94f14796f339f8a7ed4313f775ce28059d"`
Dec 18 08:23:15.202 INFO running `"docker" "rm" "-f" "e8bd1736ec3fdcfbf1f8d0d0c1c4ab94f14796f339f8a7ed4313f775ce28059d"`
Dec 18 08:23:15.504 INFO [stdout] e8bd1736ec3fdcfbf1f8d0d0c1c4ab94f14796f339f8a7ed4313f775ce28059d