Dec 12 03:43:47.330 INFO checking Bkindmonk/RustPractice against try#aa9aa79c3c583aab59ac9134542d60a780c35e2e for pr-56677
Dec 12 03:43:47.330 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-0/try#aa9aa79c3c583aab59ac9134542d60a780c35e2e:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-0/pr-56677/try#aa9aa79c3c583aab59ac9134542d60a780c35e2e:/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 +aa9aa79c3c583aab59ac9134542d60a780c35e2e-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 12 03:43:48.176 INFO [stdout] 8f5992126c6bfcbdcf67a857e48dba2d2806e93922feff00f5c31146dee1c420
Dec 12 03:43:48.178 INFO running `"docker" "start" "-a" "8f5992126c6bfcbdcf67a857e48dba2d2806e93922feff00f5c31146dee1c420"`
Dec 12 03:43:49.759 INFO [stderr] usermod: no changes
Dec 12 03:43:49.792 INFO [stderr]     Checking mergesort v0.1.0 (/source)
Dec 12 03:43:50.821 INFO [stderr] warning: variable does not need to be mutable
Dec 12 03:43:50.821 INFO [stderr]   --> src/main.rs:91:13
Dec 12 03:43:50.821 INFO [stderr]    |
Dec 12 03:43:50.821 INFO [stderr] 91 |         let mut realhalves = (*real).split_at_mut(halflength);
Dec 12 03:43:50.821 INFO [stderr]    |             ----^^^^^^^^^^
Dec 12 03:43:50.821 INFO [stderr]    |             |
Dec 12 03:43:50.821 INFO [stderr]    |             help: remove this `mut`
Dec 12 03:43:50.840 INFO [stderr]    |
Dec 12 03:43:50.840 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 03:43:50.840 INFO [stderr] 
Dec 12 03:43:50.841 INFO [stderr] warning: variable does not need to be mutable
Dec 12 03:43:50.841 INFO [stderr]   --> src/main.rs:92:13
Dec 12 03:43:50.841 INFO [stderr]    |
Dec 12 03:43:50.841 INFO [stderr] 92 |         let mut scratchhalves = (*scratch).split_at_mut(halflength);
Dec 12 03:43:50.841 INFO [stderr]    |             ----^^^^^^^^^^^^^
Dec 12 03:43:50.841 INFO [stderr]    |             |
Dec 12 03:43:50.841 INFO [stderr]    |             help: remove this `mut`
Dec 12 03:43:50.841 INFO [stderr] 
Dec 12 03:43:50.954 INFO [stderr] warning: variable does not need to be mutable
Dec 12 03:43:50.954 INFO [stderr]   --> src/main.rs:91:13
Dec 12 03:43:50.954 INFO [stderr]    |
Dec 12 03:43:50.954 INFO [stderr] 91 |         let mut realhalves = (*real).split_at_mut(halflength);
Dec 12 03:43:50.954 INFO [stderr]    |             ----^^^^^^^^^^
Dec 12 03:43:50.954 INFO [stderr]    |             |
Dec 12 03:43:50.954 INFO [stderr]    |             help: remove this `mut`
Dec 12 03:43:50.955 INFO [stderr]    |
Dec 12 03:43:50.955 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 03:43:50.955 INFO [stderr] 
Dec 12 03:43:50.955 INFO [stderr] warning: variable does not need to be mutable
Dec 12 03:43:50.956 INFO [stderr]   --> src/main.rs:92:13
Dec 12 03:43:50.956 INFO [stderr]    |
Dec 12 03:43:50.956 INFO [stderr] 92 |         let mut scratchhalves = (*scratch).split_at_mut(halflength);
Dec 12 03:43:50.956 INFO [stderr]    |             ----^^^^^^^^^^^^^
Dec 12 03:43:50.957 INFO [stderr]    |             |
Dec 12 03:43:50.957 INFO [stderr]    |             help: remove this `mut`
Dec 12 03:43:50.957 INFO [stderr] 
Dec 12 03:43:50.988 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.21s
Dec 12 03:43:50.990 INFO [stderr] su: No module specific data is present
Dec 12 03:43:52.175 INFO running `"docker" "inspect" "8f5992126c6bfcbdcf67a857e48dba2d2806e93922feff00f5c31146dee1c420"`
Dec 12 03:43:52.440 INFO running `"docker" "rm" "-f" "8f5992126c6bfcbdcf67a857e48dba2d2806e93922feff00f5c31146dee1c420"`
Dec 12 03:43:52.780 INFO [stdout] 8f5992126c6bfcbdcf67a857e48dba2d2806e93922feff00f5c31146dee1c420