Dec 04 11:33:12.324 INFO checking robbystk/rust-by-the-book against master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc for pr-56481
Dec 04 11:33:12.324 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-2/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-2/pr-56481/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/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 +c8ae2de8363be088604ffa2ccba84ff7ad7250bc-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 04 11:33:12.656 INFO [stdout] cf3334546166a4feff7b345f3b77a68ee0bef8746c2c34ce9aaee693902b3d27
Dec 04 11:33:12.661 INFO running `"docker" "start" "-a" "cf3334546166a4feff7b345f3b77a68ee0bef8746c2c34ce9aaee693902b3d27"`
Dec 04 11:33:13.651 INFO [stderr] usermod: no changes
Dec 04 11:33:13.718 INFO [stderr]     Checking errors v0.1.0 (/source)
Dec 04 11:33:13.935 INFO [stderr] warning: unused variable: `f`
Dec 04 11:33:13.935 INFO [stderr]  --> src/main.rs:4:9
Dec 04 11:33:13.935 INFO [stderr]   |
Dec 04 11:33:13.935 INFO [stderr] 4 |     let f = File::open("hello.txt").expect("Failed to open hello.txt");
Dec 04 11:33:13.935 INFO [stderr]   |         ^ help: consider using `_f` instead
Dec 04 11:33:13.935 INFO [stderr]   |
Dec 04 11:33:13.935 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 04 11:33:13.935 INFO [stderr] 
Dec 04 11:33:14.042 INFO [stderr] warning: unused variable: `f`
Dec 04 11:33:14.042 INFO [stderr]  --> src/main.rs:4:9
Dec 04 11:33:14.042 INFO [stderr]   |
Dec 04 11:33:14.042 INFO [stderr] 4 |     let f = File::open("hello.txt").expect("Failed to open hello.txt");
Dec 04 11:33:14.042 INFO [stderr]   |         ^ help: consider using `_f` instead
Dec 04 11:33:14.042 INFO [stderr]   |
Dec 04 11:33:14.042 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 04 11:33:14.042 INFO [stderr] 
Dec 04 11:33:14.066 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.40s
Dec 04 11:33:14.072 INFO [stderr] su: No module specific data is present
Dec 04 11:33:14.498 INFO running `"docker" "inspect" "cf3334546166a4feff7b345f3b77a68ee0bef8746c2c34ce9aaee693902b3d27"`
Dec 04 11:33:14.741 INFO running `"docker" "rm" "-f" "cf3334546166a4feff7b345f3b77a68ee0bef8746c2c34ce9aaee693902b3d27"`
Dec 04 11:33:14.953 INFO [stdout] cf3334546166a4feff7b345f3b77a68ee0bef8746c2c34ce9aaee693902b3d27