Oct 31 22:25:51.227 INFO checking robbystk/rust-by-the-book against try#d7816399d50d407bbce1efe9dbadf8faaaf568fc for pr-55538
Oct 31 22:25:51.228 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-55538/worker-4/try#d7816399d50d407bbce1efe9dbadf8faaaf568fc:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-55538/try#d7816399d50d407bbce1efe9dbadf8faaaf568fc:/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 +d7816399d50d407bbce1efe9dbadf8faaaf568fc-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"`
Oct 31 22:25:51.415 INFO blam! 4e5fd0cf3aab7b321c30d72a3d42ef9d74164d0645141c25fe2ba40311954740
Oct 31 22:25:51.418 INFO running `"docker" "start" "-a" "4e5fd0cf3aab7b321c30d72a3d42ef9d74164d0645141c25fe2ba40311954740"`
Oct 31 22:25:52.248 INFO kablam! usermod: no changes
Oct 31 22:25:52.324 INFO kablam!     Checking errors v0.1.0 (/source)
Oct 31 22:25:52.576 INFO kablam! warning: unused variable: `f`
Oct 31 22:25:52.576 INFO kablam!  --> src/main.rs:4:9
Oct 31 22:25:52.576 INFO kablam!   |
Oct 31 22:25:52.576 INFO kablam! 4 |     let f = File::open("hello.txt").expect("Failed to open hello.txt");
Oct 31 22:25:52.576 INFO kablam!   |         ^ help: consider using `_f` instead
Oct 31 22:25:52.576 INFO kablam!   |
Oct 31 22:25:52.576 INFO kablam!   = note: #[warn(unused_variables)] on by default
Oct 31 22:25:52.576 INFO kablam! 
Oct 31 22:25:52.602 INFO kablam! warning: unused variable: `f`
Oct 31 22:25:52.602 INFO kablam!  --> src/main.rs:4:9
Oct 31 22:25:52.602 INFO kablam!   |
Oct 31 22:25:52.602 INFO kablam! 4 |     let f = File::open("hello.txt").expect("Failed to open hello.txt");
Oct 31 22:25:52.602 INFO kablam!   |         ^ help: consider using `_f` instead
Oct 31 22:25:52.602 INFO kablam!   |
Oct 31 22:25:52.602 INFO kablam!   = note: #[warn(unused_variables)] on by default
Oct 31 22:25:52.602 INFO kablam! 
Oct 31 22:25:52.625 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 0.32s
Oct 31 22:25:52.626 INFO kablam! su: No module specific data is present
Oct 31 22:25:53.393 INFO running `"docker" "rm" "-f" "4e5fd0cf3aab7b321c30d72a3d42ef9d74164d0645141c25fe2ba40311954740"`
Oct 31 22:25:53.712 INFO blam! 4e5fd0cf3aab7b321c30d72a3d42ef9d74164d0645141c25fe2ba40311954740