[INFO] updating cached repository robertmaloney/advent2017
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/robertmaloney/advent2017
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/robertmaloney/advent2017" "work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/robertmaloney/advent2017"`
[INFO] [stderr] Cloning into 'work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/robertmaloney/advent2017'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/robertmaloney/advent2017" "work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/robertmaloney/advent2017"`
[INFO] [stderr] Cloning into 'work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/robertmaloney/advent2017'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 180761b70ebc080de44760d929554b0056d36220
[INFO] sha for GitHub repo robertmaloney/advent2017: 180761b70ebc080de44760d929554b0056d36220
[INFO] validating manifest of robertmaloney/advent2017 on toolchain master#5f9c0448dde167128d668da4555879f64e56af1d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of robertmaloney/advent2017 on toolchain try#8ec8125bea94852768b56958f05da47666c21ab0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing robertmaloney/advent2017
[INFO] finished frobbing robertmaloney/advent2017
[INFO] frobbed toml for robertmaloney/advent2017 written to work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/robertmaloney/advent2017/Cargo.toml
[INFO] started frobbing robertmaloney/advent2017
[INFO] finished frobbing robertmaloney/advent2017
[INFO] frobbed toml for robertmaloney/advent2017 written to work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/robertmaloney/advent2017/Cargo.toml
[INFO] crate robertmaloney/advent2017 already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking robertmaloney/advent2017 against master#5f9c0448dde167128d668da4555879f64e56af1d for pr-62133
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62133/worker-5/master#5f9c0448dde167128d668da4555879f64e56af1d:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/robertmaloney/advent2017:/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" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 403032704a166823155cbd919a9d1f4de21b767c5d1c8e7f13baeef4c1f934d2
[INFO] running `"docker" "start" "-a" "403032704a166823155cbd919a9d1f4de21b767c5d1c8e7f13baeef4c1f934d2"`
[INFO] [stderr]     Checking advent2017 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: function is never used: `max_min_difference`
[INFO] [stderr]  --> src/day_two/mod.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn max_min_difference<T: Iterator<Item=u32>>(iter: T) -> u32 {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `value`
[INFO] [stderr]  --> src/day_three/mod.rs:6:3
[INFO] [stderr]   |
[INFO] [stderr] 6 |   value: i32,
[INFO] [stderr]   |   ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/util/mod.rs:11:3
[INFO] [stderr]    |
[INFO] [stderr] 11 |   reader.read_to_string(&mut buffer);
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `max_min_difference`
[INFO] [stderr]  --> src/day_two/mod.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn max_min_difference<T: Iterator<Item=u32>>(iter: T) -> u32 {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `value`
[INFO] [stderr]  --> src/day_three/mod.rs:6:3
[INFO] [stderr]   |
[INFO] [stderr] 6 |   value: i32,
[INFO] [stderr]   |   ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/util/mod.rs:11:3
[INFO] [stderr]    |
[INFO] [stderr] 11 |   reader.read_to_string(&mut buffer);
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.49s
[INFO] running `"docker" "inspect" "403032704a166823155cbd919a9d1f4de21b767c5d1c8e7f13baeef4c1f934d2"`
[INFO] running `"docker" "rm" "-f" "403032704a166823155cbd919a9d1f4de21b767c5d1c8e7f13baeef4c1f934d2"`
[INFO] [stdout] 403032704a166823155cbd919a9d1f4de21b767c5d1c8e7f13baeef4c1f934d2