Nov 30 11:55:03.335 INFO checking Bkindmonk/RustPractice against master#a49316ddc99d9d595193557fc899f6c52e4d9af9 for pr-56323
Nov 30 11:55:03.335 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56323/worker-1/master#a49316ddc99d9d595193557fc899f6c52e4d9af9:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/pr-56323/master#a49316ddc99d9d595193557fc899f6c52e4d9af9:/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 +a49316ddc99d9d595193557fc899f6c52e4d9af9-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"`
Nov 30 11:55:03.828 INFO [stdout] 75a9d3a3a073c327b29bccb90d5ffb540487a33932463bd73f30e9586cd5f2aa
Nov 30 11:55:03.830 INFO running `"docker" "start" "-a" "75a9d3a3a073c327b29bccb90d5ffb540487a33932463bd73f30e9586cd5f2aa"`
Nov 30 11:55:06.139 INFO [stderr] usermod: no changes
Nov 30 11:55:06.212 INFO [stderr]     Checking mergesort v0.1.0 (/source)
Nov 30 11:55:07.000 INFO [stderr] warning: variable does not need to be mutable
Nov 30 11:55:07.001 INFO [stderr]   --> src/main.rs:91:13
Nov 30 11:55:07.001 INFO [stderr]    |
Nov 30 11:55:07.001 INFO [stderr] 91 |         let mut realhalves = (*real).split_at_mut(halflength);
Nov 30 11:55:07.001 INFO [stderr]    |             ----^^^^^^^^^^
Nov 30 11:55:07.001 INFO [stderr]    |             |
Nov 30 11:55:07.001 INFO [stderr]    |             help: remove this `mut`
Nov 30 11:55:07.002 INFO [stderr]    |
Nov 30 11:55:07.002 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Nov 30 11:55:07.002 INFO [stderr] 
Nov 30 11:55:07.002 INFO [stderr] warning: variable does not need to be mutable
Nov 30 11:55:07.002 INFO [stderr]   --> src/main.rs:92:13
Nov 30 11:55:07.002 INFO [stderr]    |
Nov 30 11:55:07.003 INFO [stderr] 92 |         let mut scratchhalves = (*scratch).split_at_mut(halflength);
Nov 30 11:55:07.003 INFO [stderr]    |             ----^^^^^^^^^^^^^
Nov 30 11:55:07.003 INFO [stderr]    |             |
Nov 30 11:55:07.003 INFO [stderr]    |             help: remove this `mut`
Nov 30 11:55:07.003 INFO [stderr] 
Nov 30 11:55:07.284 INFO [stderr] warning: variable does not need to be mutable
Nov 30 11:55:07.284 INFO [stderr]   --> src/main.rs:91:13
Nov 30 11:55:07.284 INFO [stderr]    |
Nov 30 11:55:07.284 INFO [stderr] 91 |         let mut realhalves = (*real).split_at_mut(halflength);
Nov 30 11:55:07.284 INFO [stderr]    |             ----^^^^^^^^^^
Nov 30 11:55:07.284 INFO [stderr]    |             |
Nov 30 11:55:07.284 INFO [stderr]    |             help: remove this `mut`
Nov 30 11:55:07.284 INFO [stderr]    |
Nov 30 11:55:07.284 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Nov 30 11:55:07.284 INFO [stderr] 
Nov 30 11:55:07.284 INFO [stderr] warning: variable does not need to be mutable
Nov 30 11:55:07.284 INFO [stderr]   --> src/main.rs:92:13
Nov 30 11:55:07.284 INFO [stderr]    |
Nov 30 11:55:07.284 INFO [stderr] 92 |         let mut scratchhalves = (*scratch).split_at_mut(halflength);
Nov 30 11:55:07.284 INFO [stderr]    |             ----^^^^^^^^^^^^^
Nov 30 11:55:07.284 INFO [stderr]    |             |
Nov 30 11:55:07.284 INFO [stderr]    |             help: remove this `mut`
Nov 30 11:55:07.284 INFO [stderr] 
Nov 30 11:55:07.319 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.15s
Nov 30 11:55:07.324 INFO [stderr] su: No module specific data is present
Nov 30 11:55:08.070 INFO running `"docker" "inspect" "75a9d3a3a073c327b29bccb90d5ffb540487a33932463bd73f30e9586cd5f2aa"`
Nov 30 11:55:08.394 INFO running `"docker" "rm" "-f" "75a9d3a3a073c327b29bccb90d5ffb540487a33932463bd73f30e9586cd5f2aa"`
Nov 30 11:55:08.598 INFO [stdout] 75a9d3a3a073c327b29bccb90d5ffb540487a33932463bd73f30e9586cd5f2aa