Dec 17 14:29:35.312 INFO checking suelz/chapter_4 against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 17 14:29:35.312 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-3/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/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" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 17 14:29:35.631 INFO [stdout] 5166923c7e791563bcdf2202c51e82b179a5055a46fc39fae4611bebe8699cf4
Dec 17 14:29:35.633 INFO running `"docker" "start" "-a" "5166923c7e791563bcdf2202c51e82b179a5055a46fc39fae4611bebe8699cf4"`
Dec 17 14:29:36.584 INFO [stderr]     Checking ch4 v0.1.0 (/opt/crater/workdir)
Dec 17 14:29:36.728 INFO [stderr] warning: unused variable: `word`
Dec 17 14:29:36.728 INFO [stderr]   --> src/main.rs:28:9
Dec 17 14:29:36.728 INFO [stderr]    |
Dec 17 14:29:36.728 INFO [stderr] 28 |     let word = first_word(&x);
Dec 17 14:29:36.728 INFO [stderr]    |         ^^^^ help: consider using `_word` instead
Dec 17 14:29:36.728 INFO [stderr]    |
Dec 17 14:29:36.728 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 17 14:29:36.728 INFO [stderr] 
Dec 17 14:29:36.728 INFO [stderr] warning: variable does not need to be mutable
Dec 17 14:29:36.728 INFO [stderr]   --> src/main.rs:26:9
Dec 17 14:29:36.728 INFO [stderr]    |
Dec 17 14:29:36.728 INFO [stderr] 26 |     let mut x = String::from("Conor Kennedy");
Dec 17 14:29:36.728 INFO [stderr]    |         ----^
Dec 17 14:29:36.728 INFO [stderr]    |         |
Dec 17 14:29:36.728 INFO [stderr]    |         help: remove this `mut`
Dec 17 14:29:36.728 INFO [stderr]    |
Dec 17 14:29:36.728 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 17 14:29:36.728 INFO [stderr] 
Dec 17 14:29:36.736 INFO [stderr] warning: unused variable: `word`
Dec 17 14:29:36.736 INFO [stderr]   --> src/main.rs:28:9
Dec 17 14:29:36.736 INFO [stderr]    |
Dec 17 14:29:36.736 INFO [stderr] 28 |     let word = first_word(&x);
Dec 17 14:29:36.736 INFO [stderr]    |         ^^^^ help: consider using `_word` instead
Dec 17 14:29:36.736 INFO [stderr]    |
Dec 17 14:29:36.736 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 17 14:29:36.736 INFO [stderr] 
Dec 17 14:29:36.745 INFO [stderr] warning: variable does not need to be mutable
Dec 17 14:29:36.745 INFO [stderr]   --> src/main.rs:26:9
Dec 17 14:29:36.745 INFO [stderr]    |
Dec 17 14:29:36.745 INFO [stderr] 26 |     let mut x = String::from("Conor Kennedy");
Dec 17 14:29:36.745 INFO [stderr]    |         ----^
Dec 17 14:29:36.745 INFO [stderr]    |         |
Dec 17 14:29:36.745 INFO [stderr]    |         help: remove this `mut`
Dec 17 14:29:36.745 INFO [stderr]    |
Dec 17 14:29:36.745 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 17 14:29:36.745 INFO [stderr] 
Dec 17 14:29:36.764 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.19s
Dec 17 14:29:37.290 INFO running `"docker" "inspect" "5166923c7e791563bcdf2202c51e82b179a5055a46fc39fae4611bebe8699cf4"`
Dec 17 14:29:37.430 INFO running `"docker" "rm" "-f" "5166923c7e791563bcdf2202c51e82b179a5055a46fc39fae4611bebe8699cf4"`
Dec 17 14:29:37.679 INFO [stdout] 5166923c7e791563bcdf2202c51e82b179a5055a46fc39fae4611bebe8699cf4