Dec 19 09:03:46.639 INFO checking serayuzgur/chainake against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 09:03:46.640 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-4/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 09:03:47.150 INFO [stdout] 15d2ce2bc88e72dd91092c4810d68096703df8fcc64f46335b0d768559a49148
Dec 19 09:03:47.154 INFO running `"docker" "start" "-a" "15d2ce2bc88e72dd91092c4810d68096703df8fcc64f46335b0d768559a49148"`
Dec 19 09:03:48.823 INFO [stderr]     Checking chainake v0.0.1-alpha.1 (/opt/crater/workdir)
Dec 19 09:03:49.240 INFO [stderr] warning: unused variable: `difficulty`
Dec 19 09:03:49.240 INFO [stderr]   --> src/main.rs:29:25
Dec 19 09:03:49.240 INFO [stderr]    |
Dec 19 09:03:49.240 INFO [stderr] 29 |     fn play( &mut self, difficulty: usize) {
Dec 19 09:03:49.240 INFO [stderr]    |                         ^^^^^^^^^^ help: consider using `_difficulty` instead
Dec 19 09:03:49.240 INFO [stderr]    |
Dec 19 09:03:49.240 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 09:03:49.240 INFO [stderr] 
Dec 19 09:03:49.288 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 09:03:49.288 INFO [stderr]   --> src/main.rs:42:9
Dec 19 09:03:49.288 INFO [stderr]    |
Dec 19 09:03:49.288 INFO [stderr] 42 |         stdout.flush();
Dec 19 09:03:49.288 INFO [stderr]    |         ^^^^^^^^^^^^^^^
Dec 19 09:03:49.288 INFO [stderr]    |
Dec 19 09:03:49.288 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 19 09:03:49.288 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 09:03:49.288 INFO [stderr] 
Dec 19 09:03:49.308 INFO [stderr] warning: unused variable: `difficulty`
Dec 19 09:03:49.308 INFO [stderr]   --> src/main.rs:29:25
Dec 19 09:03:49.308 INFO [stderr]    |
Dec 19 09:03:49.308 INFO [stderr] 29 |     fn play( &mut self, difficulty: usize) {
Dec 19 09:03:49.308 INFO [stderr]    |                         ^^^^^^^^^^ help: consider using `_difficulty` instead
Dec 19 09:03:49.308 INFO [stderr]    |
Dec 19 09:03:49.308 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 09:03:49.308 INFO [stderr] 
Dec 19 09:03:49.357 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 09:03:49.357 INFO [stderr]   --> src/main.rs:42:9
Dec 19 09:03:49.357 INFO [stderr]    |
Dec 19 09:03:49.357 INFO [stderr] 42 |         stdout.flush();
Dec 19 09:03:49.357 INFO [stderr]    |         ^^^^^^^^^^^^^^^
Dec 19 09:03:49.357 INFO [stderr]    |
Dec 19 09:03:49.357 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 19 09:03:49.357 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 09:03:49.357 INFO [stderr] 
Dec 19 09:03:49.380 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.59s
Dec 19 09:03:49.970 INFO running `"docker" "inspect" "15d2ce2bc88e72dd91092c4810d68096703df8fcc64f46335b0d768559a49148"`
Dec 19 09:03:50.229 INFO running `"docker" "rm" "-f" "15d2ce2bc88e72dd91092c4810d68096703df8fcc64f46335b0d768559a49148"`
Dec 19 09:03:50.656 INFO [stdout] 15d2ce2bc88e72dd91092c4810d68096703df8fcc64f46335b0d768559a49148