[INFO] updating cached repository serayuzgur/chainake
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/serayuzgur/chainake
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/serayuzgur/chainake" "work/ex/pr-57745/sources/master#f613dc138b4012cf3d2eb40718fbcc7cf0a34039/gh/serayuzgur/chainake"`
[INFO] [stderr] Cloning into 'work/ex/pr-57745/sources/master#f613dc138b4012cf3d2eb40718fbcc7cf0a34039/gh/serayuzgur/chainake'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/serayuzgur/chainake" "work/ex/pr-57745/sources/try#29640c57b5f92febba0e40c50cb863c9a7ede51d/gh/serayuzgur/chainake"`
[INFO] [stderr] Cloning into 'work/ex/pr-57745/sources/try#29640c57b5f92febba0e40c50cb863c9a7ede51d/gh/serayuzgur/chainake'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c5693bc2e3c41494c0b1c603737e0bf6a9e65787
[INFO] sha for GitHub repo serayuzgur/chainake: c5693bc2e3c41494c0b1c603737e0bf6a9e65787
[INFO] validating manifest of serayuzgur/chainake on toolchain master#f613dc138b4012cf3d2eb40718fbcc7cf0a34039
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+f613dc138b4012cf3d2eb40718fbcc7cf0a34039-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of serayuzgur/chainake on toolchain try#29640c57b5f92febba0e40c50cb863c9a7ede51d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+29640c57b5f92febba0e40c50cb863c9a7ede51d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing serayuzgur/chainake
[INFO] finished frobbing serayuzgur/chainake
[INFO] frobbed toml for serayuzgur/chainake written to work/ex/pr-57745/sources/master#f613dc138b4012cf3d2eb40718fbcc7cf0a34039/gh/serayuzgur/chainake/Cargo.toml
[INFO] started frobbing serayuzgur/chainake
[INFO] finished frobbing serayuzgur/chainake
[INFO] frobbed toml for serayuzgur/chainake written to work/ex/pr-57745/sources/try#29640c57b5f92febba0e40c50cb863c9a7ede51d/gh/serayuzgur/chainake/Cargo.toml
[INFO] crate serayuzgur/chainake has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+f613dc138b4012cf3d2eb40718fbcc7cf0a34039-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+29640c57b5f92febba0e40c50cb863c9a7ede51d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking serayuzgur/chainake against try#29640c57b5f92febba0e40c50cb863c9a7ede51d for pr-57745
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57745/worker-6/try#29640c57b5f92febba0e40c50cb863c9a7ede51d:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57745/sources/try#29640c57b5f92febba0e40c50cb863c9a7ede51d/gh/serayuzgur/chainake:/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" "+29640c57b5f92febba0e40c50cb863c9a7ede51d-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 0194b83e8f97e4f0a7d7d7721f2c52a91fda4e97b868406860c964a66354b679
[INFO] running `"docker" "start" "-a" "0194b83e8f97e4f0a7d7d7721f2c52a91fda4e97b868406860c964a66354b679"`
[INFO] [stderr]     Checking termion v1.5.1
[INFO] [stderr]     Checking chainake v0.0.1-alpha.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `difficulty`
[INFO] [stderr]   --> src/main.rs:29:25
[INFO] [stderr]    |
[INFO] [stderr] 29 |     fn play( &mut self, difficulty: usize) {
[INFO] [stderr]    |                         ^^^^^^^^^^ help: consider using `_difficulty` instead
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `difficulty`
[INFO] [stderr]   --> src/main.rs:29:25
[INFO] [stderr]    |
[INFO] [stderr] 29 |     fn play( &mut self, difficulty: usize) {
[INFO] [stderr]    |                         ^^^^^^^^^^ help: consider using `_difficulty` instead
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:42:9
[INFO] [stderr]    |
[INFO] [stderr] 42 |         stdout.flush();
[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: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:42:9
[INFO] [stderr]    |
[INFO] [stderr] 42 |         stdout.flush();
[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 1.08s
[INFO] running `"docker" "inspect" "0194b83e8f97e4f0a7d7d7721f2c52a91fda4e97b868406860c964a66354b679"`
[INFO] running `"docker" "rm" "-f" "0194b83e8f97e4f0a7d7d7721f2c52a91fda4e97b868406860c964a66354b679"`
[INFO] [stdout] 0194b83e8f97e4f0a7d7d7721f2c52a91fda4e97b868406860c964a66354b679