Dec 12 09:38:39.316 INFO checking puzzle-solver-0.4.1 against try#aa9aa79c3c583aab59ac9134542d60a780c35e2e for pr-56677
Dec 12 09:38:39.316 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-3/try#aa9aa79c3c583aab59ac9134542d60a780c35e2e:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-3/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 09:38:39.607 INFO [stdout] f252d798cae2467a6e0dba45b12f79f320955cf8f6100125e3a1ad062115e10e
Dec 12 09:38:39.609 INFO running `"docker" "start" "-a" "f252d798cae2467a6e0dba45b12f79f320955cf8f6100125e3a1ad062115e10e"`
Dec 12 09:38:40.100 INFO [stderr] usermod: no changes
Dec 12 09:38:40.160 INFO [stderr]     Checking num-rational v0.1.42
Dec 12 09:38:41.080 INFO [stderr]     Checking puzzle-solver v0.4.1 (/source)
Dec 12 09:38:42.440 INFO [stderr] warning: variable does not need to be mutable
Dec 12 09:38:42.440 INFO [stderr]    --> src/puzzle.rs:898:21
Dec 12 09:38:42.440 INFO [stderr]     |
Dec 12 09:38:42.440 INFO [stderr] 898 |         let (mut l, mut r) = slice.split_at_mut(b);
Dec 12 09:38:42.440 INFO [stderr]     |                     ----^
Dec 12 09:38:42.440 INFO [stderr]     |                     |
Dec 12 09:38:42.440 INFO [stderr]     |                     help: remove this `mut`
Dec 12 09:38:42.440 INFO [stderr]     |
Dec 12 09:38:42.440 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 12 09:38:42.440 INFO [stderr] 
Dec 12 09:38:42.440 INFO [stderr] warning: variable does not need to be mutable
Dec 12 09:38:42.440 INFO [stderr]    --> src/puzzle.rs:898:14
Dec 12 09:38:42.440 INFO [stderr]     |
Dec 12 09:38:42.440 INFO [stderr] 898 |         let (mut l, mut r) = slice.split_at_mut(b);
Dec 12 09:38:42.440 INFO [stderr]     |              ----^
Dec 12 09:38:42.440 INFO [stderr]     |              |
Dec 12 09:38:42.440 INFO [stderr]     |              help: remove this `mut`
Dec 12 09:38:42.440 INFO [stderr] 
Dec 12 09:38:42.812 INFO [stderr] warning: variable does not need to be mutable
Dec 12 09:38:42.812 INFO [stderr]    --> src/puzzle.rs:898:21
Dec 12 09:38:42.812 INFO [stderr]     |
Dec 12 09:38:42.812 INFO [stderr] 898 |         let (mut l, mut r) = slice.split_at_mut(b);
Dec 12 09:38:42.812 INFO [stderr]     |                     ----^
Dec 12 09:38:42.812 INFO [stderr]     |                     |
Dec 12 09:38:42.812 INFO [stderr]     |                     help: remove this `mut`
Dec 12 09:38:42.812 INFO [stderr]     |
Dec 12 09:38:42.812 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 12 09:38:42.812 INFO [stderr] 
Dec 12 09:38:42.812 INFO [stderr] warning: variable does not need to be mutable
Dec 12 09:38:42.812 INFO [stderr]    --> src/puzzle.rs:898:14
Dec 12 09:38:42.812 INFO [stderr]     |
Dec 12 09:38:42.812 INFO [stderr] 898 |         let (mut l, mut r) = slice.split_at_mut(b);
Dec 12 09:38:42.813 INFO [stderr]     |              ----^
Dec 12 09:38:42.813 INFO [stderr]     |              |
Dec 12 09:38:42.813 INFO [stderr]     |              help: remove this `mut`
Dec 12 09:38:42.813 INFO [stderr] 
Dec 12 09:38:47.743 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.61s
Dec 12 09:38:47.744 INFO [stderr] su: No module specific data is present
Dec 12 09:38:48.346 INFO running `"docker" "inspect" "f252d798cae2467a6e0dba45b12f79f320955cf8f6100125e3a1ad062115e10e"`
Dec 12 09:38:48.646 INFO running `"docker" "rm" "-f" "f252d798cae2467a6e0dba45b12f79f320955cf8f6100125e3a1ad062115e10e"`
Dec 12 09:38:49.022 INFO [stdout] f252d798cae2467a6e0dba45b12f79f320955cf8f6100125e3a1ad062115e10e