Dec 11 10:55:46.717 INFO checking robbystk/rust-by-the-book against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 11 10:55:46.717 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-0/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-0/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 10:55:47.058 INFO [stdout] 120ec88c42bd635d78228dfb95d5e37d2423f720617abcc9680842676d1f0590
Dec 11 10:55:47.061 INFO running `"docker" "start" "-a" "120ec88c42bd635d78228dfb95d5e37d2423f720617abcc9680842676d1f0590"`
Dec 11 10:55:47.863 INFO [stderr] usermod: no changes
Dec 11 10:55:47.928 INFO [stderr]     Checking errors v0.1.0 (/source)
Dec 11 10:55:48.258 INFO [stderr] warning: unused variable: `f`
Dec 11 10:55:48.258 INFO [stderr]  --> src/main.rs:4:9
Dec 11 10:55:48.258 INFO [stderr]   |
Dec 11 10:55:48.258 INFO [stderr] 4 |     let f = File::open("hello.txt").expect("Failed to open hello.txt");
Dec 11 10:55:48.258 INFO [stderr]   |         ^ help: consider using `_f` instead
Dec 11 10:55:48.258 INFO [stderr]   |
Dec 11 10:55:48.258 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 11 10:55:48.258 INFO [stderr] 
Dec 11 10:55:48.288 INFO [stderr] warning: unused variable: `f`
Dec 11 10:55:48.289 INFO [stderr]  --> src/main.rs:4:9
Dec 11 10:55:48.289 INFO [stderr]   |
Dec 11 10:55:48.289 INFO [stderr] 4 |     let f = File::open("hello.txt").expect("Failed to open hello.txt");
Dec 11 10:55:48.289 INFO [stderr]   |         ^ help: consider using `_f` instead
Dec 11 10:55:48.289 INFO [stderr]   |
Dec 11 10:55:48.289 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 11 10:55:48.289 INFO [stderr] 
Dec 11 10:55:48.299 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.40s
Dec 11 10:55:48.299 INFO [stderr] su: No module specific data is present
Dec 11 10:55:48.609 INFO running `"docker" "inspect" "120ec88c42bd635d78228dfb95d5e37d2423f720617abcc9680842676d1f0590"`
Dec 11 10:55:48.745 INFO running `"docker" "rm" "-f" "120ec88c42bd635d78228dfb95d5e37d2423f720617abcc9680842676d1f0590"`
Dec 11 10:55:48.974 INFO [stdout] 120ec88c42bd635d78228dfb95d5e37d2423f720617abcc9680842676d1f0590