[INFO] updating cached repository https://github.com/khanhtc1202/undefined-rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f32eab722599cd94d832f6a03d75f218efd34090
[INFO] checking khanhtc1202/undefined-rust against try#d27c6c6a469a28343396a8f3ac1c9d403aabda69 for pr-66037
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkhanhtc1202%2Fundefined-rust" "/workspace/builds/worker-6/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/khanhtc1202/undefined-rust on toolchain d27c6c6a469a28343396a8f3ac1c9d403aabda69
[INFO] running `"/workspace/cargo-home/bin/cargo" "+d27c6c6a469a28343396a8f3ac1c9d403aabda69" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/khanhtc1202/undefined-rust
[INFO] finished tweaking git repo https://github.com/khanhtc1202/undefined-rust
[INFO] tweaked toml for git repo https://github.com/khanhtc1202/undefined-rust written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/khanhtc1202/undefined-rust already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+d27c6c6a469a28343396a8f3ac1c9d403aabda69" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+d27c6c6a469a28343396a8f3ac1c9d403aabda69" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 0b12462f6e72093c63f0cd07491f31c31524d25aa627439833d7500298f3f669
[INFO] running `"docker" "start" "-a" "0b12462f6e72093c63f0cd07491f31c31524d25aa627439833d7500298f3f669"`
[INFO] [stderr]     Checking sandbox v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/mutexs.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 | /         /// To access the data inside the mutex, we use the lock method to acquire the lock.
[INFO] [stderr] 15 | |         ///
[INFO] [stderr] 16 | |         /// The call to lock would fail if another thread holding the lock panicked. => need unwrap()
[INFO] [stderr] 17 | |         ///
[INFO] [stderr] ...  |
[INFO] [stderr] 21 | |         /// after this line, we going out of inner scope and ref `num` will be drop => return the lock to main thread
[INFO] [stderr] 22 | |         /// using inner scope, we don’t risk forgetting to release the lock and blocking the mutex from being used by other threads
[INFO] [stderr]    | |___________________________________________________________________________________________________________________________________^
[INFO] [stderr] 23 |           let mut num = m.lock().unwrap();
[INFO] [stderr]    |           -------------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/mutexs.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 | /         /// To access the data inside the mutex, we use the lock method to acquire the lock.
[INFO] [stderr] 15 | |         ///
[INFO] [stderr] 16 | |         /// The call to lock would fail if another thread holding the lock panicked. => need unwrap()
[INFO] [stderr] 17 | |         ///
[INFO] [stderr] ...  |
[INFO] [stderr] 21 | |         /// after this line, we going out of inner scope and ref `num` will be drop => return the lock to main thread
[INFO] [stderr] 22 | |         /// using inner scope, we don’t risk forgetting to release the lock and blocking the mutex from being used by other threads
[INFO] [stderr]    | |___________________________________________________________________________________________________________________________________^
[INFO] [stderr] 23 |           let mut num = m.lock().unwrap();
[INFO] [stderr]    |           -------------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.81s
[INFO] running `"docker" "inspect" "0b12462f6e72093c63f0cd07491f31c31524d25aa627439833d7500298f3f669"`
[INFO] running `"docker" "rm" "-f" "0b12462f6e72093c63f0cd07491f31c31524d25aa627439833d7500298f3f669"`
[INFO] [stdout] 0b12462f6e72093c63f0cd07491f31c31524d25aa627439833d7500298f3f669