[INFO] updating cached repository sebasmagri/rust-concurrency-patterns
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/sebasmagri/rust-concurrency-patterns
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/sebasmagri/rust-concurrency-patterns" "work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/sebasmagri/rust-concurrency-patterns"`
[INFO] [stderr] Cloning into 'work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/sebasmagri/rust-concurrency-patterns'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/sebasmagri/rust-concurrency-patterns" "work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/sebasmagri/rust-concurrency-patterns"`
[INFO] [stderr] Cloning into 'work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/sebasmagri/rust-concurrency-patterns'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c916fe831faec73a7fb5d652e91fa9da528d85c4
[INFO] sha for GitHub repo sebasmagri/rust-concurrency-patterns: c916fe831faec73a7fb5d652e91fa9da528d85c4
[INFO] validating manifest of sebasmagri/rust-concurrency-patterns 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 sebasmagri/rust-concurrency-patterns 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 sebasmagri/rust-concurrency-patterns
[INFO] finished frobbing sebasmagri/rust-concurrency-patterns
[INFO] frobbed toml for sebasmagri/rust-concurrency-patterns written to work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/sebasmagri/rust-concurrency-patterns/Cargo.toml
[INFO] started frobbing sebasmagri/rust-concurrency-patterns
[INFO] finished frobbing sebasmagri/rust-concurrency-patterns
[INFO] frobbed toml for sebasmagri/rust-concurrency-patterns written to work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/sebasmagri/rust-concurrency-patterns/Cargo.toml
[INFO] crate sebasmagri/rust-concurrency-patterns 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+75eff020d0923c035c2fe220db4a0465cd847048-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] checking sebasmagri/rust-concurrency-patterns against master#c43d03a19f326f4a323569328cc501e86eb6d22e for pr-63565
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63565/worker-2/master#c43d03a19f326f4a323569328cc501e86eb6d22e:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/sebasmagri/rust-concurrency-patterns:/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] a260ec31507f1c5df5713f51b287e9d0ad13afa9dfc243dea89c3643d1b3587c
[INFO] running `"docker" "start" "-a" "a260ec31507f1c5df5713f51b287e9d0ad13afa9dfc243dea89c3643d1b3587c"`
[INFO] [stderr]     Checking concurrency-patterns v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> examples/04-fan-in.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     consumer(Arc::new(Mutex::new(rx))).join();
[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 1.18s
[INFO] running `"docker" "inspect" "a260ec31507f1c5df5713f51b287e9d0ad13afa9dfc243dea89c3643d1b3587c"`
[INFO] running `"docker" "rm" "-f" "a260ec31507f1c5df5713f51b287e9d0ad13afa9dfc243dea89c3643d1b3587c"`
[INFO] [stdout] a260ec31507f1c5df5713f51b287e9d0ad13afa9dfc243dea89c3643d1b3587c