Dec 05 03:18:20.385 INFO checking Bkindmonk/RustPractice against master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc for pr-56481
Dec 05 03:18:20.385 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-1/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/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 03:18:20.896 INFO [stdout] 7f5603c69f9d5cf63ed57a77b852c818eb41e11d8cc5645cf6e1f56026d61f19
Dec 05 03:18:20.899 INFO running `"docker" "start" "-a" "7f5603c69f9d5cf63ed57a77b852c818eb41e11d8cc5645cf6e1f56026d61f19"`
Dec 05 03:18:22.387 INFO [stderr] usermod: no changes
Dec 05 03:18:22.488 INFO [stderr]     Checking mergesort v0.1.0 (/source)
Dec 05 03:18:23.235 INFO [stderr] warning: variable does not need to be mutable
Dec 05 03:18:23.235 INFO [stderr]   --> src/main.rs:91:13
Dec 05 03:18:23.235 INFO [stderr]    |
Dec 05 03:18:23.235 INFO [stderr] 91 |         let mut realhalves = (*real).split_at_mut(halflength);
Dec 05 03:18:23.235 INFO [stderr]    |             ----^^^^^^^^^^
Dec 05 03:18:23.235 INFO [stderr]    |             |
Dec 05 03:18:23.235 INFO [stderr]    |             help: remove this `mut`
Dec 05 03:18:23.235 INFO [stderr]    |
Dec 05 03:18:23.235 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 05 03:18:23.235 INFO [stderr] 
Dec 05 03:18:23.235 INFO [stderr] warning: variable does not need to be mutable
Dec 05 03:18:23.235 INFO [stderr]   --> src/main.rs:92:13
Dec 05 03:18:23.235 INFO [stderr]    |
Dec 05 03:18:23.235 INFO [stderr] 92 |         let mut scratchhalves = (*scratch).split_at_mut(halflength);
Dec 05 03:18:23.235 INFO [stderr]    |             ----^^^^^^^^^^^^^
Dec 05 03:18:23.235 INFO [stderr]    |             |
Dec 05 03:18:23.235 INFO [stderr]    |             help: remove this `mut`
Dec 05 03:18:23.235 INFO [stderr] 
Dec 05 03:18:23.335 INFO [stderr] warning: variable does not need to be mutable
Dec 05 03:18:23.335 INFO [stderr]   --> src/main.rs:91:13
Dec 05 03:18:23.335 INFO [stderr]    |
Dec 05 03:18:23.335 INFO [stderr] 91 |         let mut realhalves = (*real).split_at_mut(halflength);
Dec 05 03:18:23.335 INFO [stderr]    |             ----^^^^^^^^^^
Dec 05 03:18:23.335 INFO [stderr]    |             |
Dec 05 03:18:23.335 INFO [stderr]    |             help: remove this `mut`
Dec 05 03:18:23.335 INFO [stderr]    |
Dec 05 03:18:23.335 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 05 03:18:23.335 INFO [stderr] 
Dec 05 03:18:23.335 INFO [stderr] warning: variable does not need to be mutable
Dec 05 03:18:23.335 INFO [stderr]   --> src/main.rs:92:13
Dec 05 03:18:23.335 INFO [stderr]    |
Dec 05 03:18:23.335 INFO [stderr] 92 |         let mut scratchhalves = (*scratch).split_at_mut(halflength);
Dec 05 03:18:23.335 INFO [stderr]    |             ----^^^^^^^^^^^^^
Dec 05 03:18:23.335 INFO [stderr]    |             |
Dec 05 03:18:23.335 INFO [stderr]    |             help: remove this `mut`
Dec 05 03:18:23.335 INFO [stderr] 
Dec 05 03:18:23.357 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.94s
Dec 05 03:18:23.363 INFO [stderr] su: No module specific data is present
Dec 05 03:18:23.849 INFO running `"docker" "inspect" "7f5603c69f9d5cf63ed57a77b852c818eb41e11d8cc5645cf6e1f56026d61f19"`
Dec 05 03:18:24.109 INFO running `"docker" "rm" "-f" "7f5603c69f9d5cf63ed57a77b852c818eb41e11d8cc5645cf6e1f56026d61f19"`
Dec 05 03:18:24.391 INFO [stdout] 7f5603c69f9d5cf63ed57a77b852c818eb41e11d8cc5645cf6e1f56026d61f19