Dec 11 08:37:47.625 INFO checking suelz/chapter_4 against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 11 08:37:47.625 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-1/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/pr-56677/master#3a75e80557a103497cffbcab395a2f37061a77ea:/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 +3a75e80557a103497cffbcab395a2f37061a77ea-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 11 08:37:48.012 INFO [stdout] 0827cbb6160dbddd73b8e3aefc62b625e747ef2c6582eb5436c6c2a074f64fc8
Dec 11 08:37:48.018 INFO running `"docker" "start" "-a" "0827cbb6160dbddd73b8e3aefc62b625e747ef2c6582eb5436c6c2a074f64fc8"`
Dec 11 08:37:48.707 INFO [stderr] usermod: no changes
Dec 11 08:37:48.754 INFO [stderr]     Checking ch4 v0.1.0 (/source)
Dec 11 08:37:48.940 INFO [stderr] warning: unused variable: `word`
Dec 11 08:37:48.940 INFO [stderr]   --> src/main.rs:28:9
Dec 11 08:37:48.940 INFO [stderr]    |
Dec 11 08:37:48.940 INFO [stderr] 28 |     let word = first_word(&x);
Dec 11 08:37:48.940 INFO [stderr]    |         ^^^^ help: consider using `_word` instead
Dec 11 08:37:48.940 INFO [stderr]    |
Dec 11 08:37:48.940 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 11 08:37:48.940 INFO [stderr] 
Dec 11 08:37:48.946 INFO [stderr] warning: variable does not need to be mutable
Dec 11 08:37:48.946 INFO [stderr]   --> src/main.rs:26:9
Dec 11 08:37:48.946 INFO [stderr]    |
Dec 11 08:37:48.946 INFO [stderr] 26 |     let mut x = String::from("Conor Kennedy");
Dec 11 08:37:48.947 INFO [stderr]    |         ----^
Dec 11 08:37:48.947 INFO [stderr]    |         |
Dec 11 08:37:48.947 INFO [stderr]    |         help: remove this `mut`
Dec 11 08:37:48.947 INFO [stderr]    |
Dec 11 08:37:48.948 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 11 08:37:48.948 INFO [stderr] 
Dec 11 08:37:48.981 INFO [stderr] warning: unused variable: `word`
Dec 11 08:37:48.981 INFO [stderr]   --> src/main.rs:28:9
Dec 11 08:37:48.981 INFO [stderr]    |
Dec 11 08:37:48.981 INFO [stderr] 28 |     let word = first_word(&x);
Dec 11 08:37:48.981 INFO [stderr]    |         ^^^^ help: consider using `_word` instead
Dec 11 08:37:48.981 INFO [stderr]    |
Dec 11 08:37:48.981 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 11 08:37:48.981 INFO [stderr] 
Dec 11 08:37:48.981 INFO [stderr] warning: variable does not need to be mutable
Dec 11 08:37:48.981 INFO [stderr]   --> src/main.rs:26:9
Dec 11 08:37:48.981 INFO [stderr]    |
Dec 11 08:37:48.981 INFO [stderr] 26 |     let mut x = String::from("Conor Kennedy");
Dec 11 08:37:48.981 INFO [stderr]    |         ----^
Dec 11 08:37:48.981 INFO [stderr]    |         |
Dec 11 08:37:48.981 INFO [stderr]    |         help: remove this `mut`
Dec 11 08:37:48.981 INFO [stderr]    |
Dec 11 08:37:48.981 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 11 08:37:48.981 INFO [stderr] 
Dec 11 08:37:49.004 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.27s
Dec 11 08:37:49.004 INFO [stderr] su: No module specific data is present
Dec 11 08:37:49.354 INFO running `"docker" "inspect" "0827cbb6160dbddd73b8e3aefc62b625e747ef2c6582eb5436c6c2a074f64fc8"`
Dec 11 08:37:49.511 INFO running `"docker" "rm" "-f" "0827cbb6160dbddd73b8e3aefc62b625e747ef2c6582eb5436c6c2a074f64fc8"`
Dec 11 08:37:49.700 INFO [stdout] 0827cbb6160dbddd73b8e3aefc62b625e747ef2c6582eb5436c6c2a074f64fc8