Dec 19 07:56:12.085 INFO checking suelz/chapter_4 against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 07:56:12.085 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-1/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/suelz/chapter_4:/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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 07:56:12.320 INFO [stdout] c99c5d39bae782ad9d49fe998265bedb1a712c0de58f544e5b36e01a231b6cc7
Dec 19 07:56:12.326 INFO running `"docker" "start" "-a" "c99c5d39bae782ad9d49fe998265bedb1a712c0de58f544e5b36e01a231b6cc7"`
Dec 19 07:56:13.015 INFO [stderr]     Checking ch4 v0.1.0 (/opt/crater/workdir)
Dec 19 07:56:13.156 INFO [stderr] warning: unused variable: `word`
Dec 19 07:56:13.156 INFO [stderr]   --> src/main.rs:28:9
Dec 19 07:56:13.156 INFO [stderr]    |
Dec 19 07:56:13.156 INFO [stderr] 28 |     let word = first_word(&x);
Dec 19 07:56:13.156 INFO [stderr]    |         ^^^^ help: consider using `_word` instead
Dec 19 07:56:13.156 INFO [stderr]    |
Dec 19 07:56:13.156 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 07:56:13.156 INFO [stderr] 
Dec 19 07:56:13.160 INFO [stderr] warning: unused variable: `word`
Dec 19 07:56:13.161 INFO [stderr]   --> src/main.rs:28:9
Dec 19 07:56:13.161 INFO [stderr]    |
Dec 19 07:56:13.161 INFO [stderr] 28 |     let word = first_word(&x);
Dec 19 07:56:13.161 INFO [stderr]    |         ^^^^ help: consider using `_word` instead
Dec 19 07:56:13.161 INFO [stderr]    |
Dec 19 07:56:13.161 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 07:56:13.161 INFO [stderr] 
Dec 19 07:56:13.161 INFO [stderr] warning: variable does not need to be mutable
Dec 19 07:56:13.161 INFO [stderr]   --> src/main.rs:26:9
Dec 19 07:56:13.161 INFO [stderr]    |
Dec 19 07:56:13.161 INFO [stderr] 26 |     let mut x = String::from("Conor Kennedy");
Dec 19 07:56:13.161 INFO [stderr]    |         ----^
Dec 19 07:56:13.161 INFO [stderr]    |         |
Dec 19 07:56:13.161 INFO [stderr]    |         help: remove this `mut`
Dec 19 07:56:13.161 INFO [stderr]    |
Dec 19 07:56:13.161 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 19 07:56:13.161 INFO [stderr] 
Dec 19 07:56:13.172 INFO [stderr] warning: variable does not need to be mutable
Dec 19 07:56:13.172 INFO [stderr]   --> src/main.rs:26:9
Dec 19 07:56:13.172 INFO [stderr]    |
Dec 19 07:56:13.172 INFO [stderr] 26 |     let mut x = String::from("Conor Kennedy");
Dec 19 07:56:13.172 INFO [stderr]    |         ----^
Dec 19 07:56:13.172 INFO [stderr]    |         |
Dec 19 07:56:13.172 INFO [stderr]    |         help: remove this `mut`
Dec 19 07:56:13.172 INFO [stderr]    |
Dec 19 07:56:13.172 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 19 07:56:13.172 INFO [stderr] 
Dec 19 07:56:13.212 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.20s
Dec 19 07:56:13.638 INFO running `"docker" "inspect" "c99c5d39bae782ad9d49fe998265bedb1a712c0de58f544e5b36e01a231b6cc7"`
Dec 19 07:56:13.737 INFO running `"docker" "rm" "-f" "c99c5d39bae782ad9d49fe998265bedb1a712c0de58f544e5b36e01a231b6cc7"`
Dec 19 07:56:13.897 INFO [stdout] c99c5d39bae782ad9d49fe998265bedb1a712c0de58f544e5b36e01a231b6cc7