[INFO] updating cached repository elycruz/rust-book
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/elycruz/rust-book
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/elycruz/rust-book" "work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/elycruz/rust-book"`
[INFO] [stderr] Cloning into 'work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/elycruz/rust-book'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/elycruz/rust-book" "work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/elycruz/rust-book"`
[INFO] [stderr] Cloning into 'work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/elycruz/rust-book'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] cd9266b6c61f2b69f353735e61512e1d19bc9fb5
[INFO] sha for GitHub repo elycruz/rust-book: cd9266b6c61f2b69f353735e61512e1d19bc9fb5
[INFO] validating manifest of elycruz/rust-book on toolchain master#c43d03a19f326f4a323569328cc501e86eb6d22e
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of elycruz/rust-book on toolchain try#75eff020d0923c035c2fe220db4a0465cd847048
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+75eff020d0923c035c2fe220db4a0465cd847048-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing elycruz/rust-book
[INFO] finished frobbing elycruz/rust-book
[INFO] frobbed toml for elycruz/rust-book written to work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/elycruz/rust-book/Cargo.toml
[INFO] started frobbing elycruz/rust-book
[INFO] finished frobbing elycruz/rust-book
[INFO] frobbed toml for elycruz/rust-book written to work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/elycruz/rust-book/Cargo.toml
[INFO] crate elycruz/rust-book already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+75eff020d0923c035c2fe220db4a0465cd847048-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking elycruz/rust-book against master#c43d03a19f326f4a323569328cc501e86eb6d22e for pr-63565
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63565/worker-4/master#c43d03a19f326f4a323569328cc501e86eb6d22e:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/elycruz/rust-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" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 8a297b8e152dcc203039926d0bded7828b54f8c2f7fdf6971fe0d21be7ae8439
[INFO] running `"docker" "start" "-a" "8a297b8e152dcc203039926d0bded7828b54f8c2f7fdf6971fe0d21be7ae8439"`
[INFO] [stderr]     Checking rand v0.4.3
[INFO] [stderr]     Checking rust-book v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: function is never used: `maximum`
[INFO] [stderr]   --> src/chp8/main.rs:45:1
[INFO] [stderr]    |
[INFO] [stderr] 45 | fn maximum<T: Ord + Debug>(xs: &Vec<T>) -> Option<&T> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.39s
[INFO] running `"docker" "inspect" "8a297b8e152dcc203039926d0bded7828b54f8c2f7fdf6971fe0d21be7ae8439"`
[INFO] running `"docker" "rm" "-f" "8a297b8e152dcc203039926d0bded7828b54f8c2f7fdf6971fe0d21be7ae8439"`
[INFO] [stdout] 8a297b8e152dcc203039926d0bded7828b54f8c2f7fdf6971fe0d21be7ae8439