Dec 19 10:04:44.774 INFO checking robbystk/rust-by-the-book against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 10:04:44.774 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-7/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/robbystk/rust-by-the-book:/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 10:04:45.068 INFO [stdout] 19fefcbab74fb5537edbb2b702d90e9fbc807152613ef547e3c2244c069403a5
Dec 19 10:04:45.074 INFO running `"docker" "start" "-a" "19fefcbab74fb5537edbb2b702d90e9fbc807152613ef547e3c2244c069403a5"`
Dec 19 10:04:45.915 INFO [stderr]     Checking errors v0.1.0 (/opt/crater/workdir)
Dec 19 10:04:46.088 INFO [stderr] warning: unused variable: `f`
Dec 19 10:04:46.088 INFO [stderr]  --> src/main.rs:4:9
Dec 19 10:04:46.088 INFO [stderr]   |
Dec 19 10:04:46.088 INFO [stderr] 4 |     let f = File::open("hello.txt").expect("Failed to open hello.txt");
Dec 19 10:04:46.088 INFO [stderr]   |         ^ help: consider using `_f` instead
Dec 19 10:04:46.088 INFO [stderr]   |
Dec 19 10:04:46.088 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 19 10:04:46.089 INFO [stderr] 
Dec 19 10:04:46.108 INFO [stderr] warning: unused variable: `f`
Dec 19 10:04:46.108 INFO [stderr]  --> src/main.rs:4:9
Dec 19 10:04:46.108 INFO [stderr]   |
Dec 19 10:04:46.108 INFO [stderr] 4 |     let f = File::open("hello.txt").expect("Failed to open hello.txt");
Dec 19 10:04:46.108 INFO [stderr]   |         ^ help: consider using `_f` instead
Dec 19 10:04:46.108 INFO [stderr]   |
Dec 19 10:04:46.108 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 19 10:04:46.108 INFO [stderr] 
Dec 19 10:04:46.148 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.23s
Dec 19 10:04:46.525 INFO running `"docker" "inspect" "19fefcbab74fb5537edbb2b702d90e9fbc807152613ef547e3c2244c069403a5"`
Dec 19 10:04:46.694 INFO running `"docker" "rm" "-f" "19fefcbab74fb5537edbb2b702d90e9fbc807152613ef547e3c2244c069403a5"`
Dec 19 10:04:47.076 INFO [stdout] 19fefcbab74fb5537edbb2b702d90e9fbc807152613ef547e3c2244c069403a5