[INFO] cloning repository https://github.com/tynr426/concurrent_prog
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tynr426/concurrent_prog" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftynr426%2Fconcurrent_prog", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftynr426%2Fconcurrent_prog'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b6ebb7610abe74273975100bb8192b92d59660e1
[INFO] documenting tynr426/concurrent_prog against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftynr426%2Fconcurrent_prog" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tynr426/concurrent_prog on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tynr426/concurrent_prog
[INFO] finished tweaking git repo https://github.com/tynr426/concurrent_prog
[INFO] tweaked toml for git repo https://github.com/tynr426/concurrent_prog written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/tynr426/concurrent_prog already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 35030c330730f3e37f4b3d7209dd2fa3216bf819a8b67dc4fc147306d2a0407e
[INFO] running `Command { std: "docker" "start" "-a" "35030c330730f3e37f4b3d7209dd2fa3216bf819a8b67dc4fc147306d2a0407e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "35030c330730f3e37f4b3d7209dd2fa3216bf819a8b67dc4fc147306d2a0407e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "35030c330730f3e37f4b3d7209dd2fa3216bf819a8b67dc4fc147306d2a0407e", kill_on_drop: false }`
[INFO] [stdout] 35030c330730f3e37f4b3d7209dd2fa3216bf819a8b67dc4fc147306d2a0407e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6508c3ce12632a0884bdad8c571b0412a7dc4a0bc6b80f3988513e525f913bcb
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "6508c3ce12632a0884bdad8c571b0412a7dc4a0bc6b80f3988513e525f913bcb", kill_on_drop: false }`
[INFO] [stderr]  Documenting concurrent_prog v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0603]: function `mutex_test` is private
[INFO] [stdout]  --> src/main.rs:5:18
[INFO] [stdout]   |
[INFO] [stdout] 5 | use mutex_learn::mutex_test;
[INFO] [stdout]   |                  ^^^^^^^^^^ private function
[INFO] [stdout]   |
[INFO] [stdout] note: the function `mutex_test` is defined here
[INFO] [stdout]  --> src/mutex_learn.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn mutex_test() {
[INFO] [stdout]   | ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0603`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `concurrent_prog`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name concurrent_prog src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "6508c3ce12632a0884bdad8c571b0412a7dc4a0bc6b80f3988513e525f913bcb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6508c3ce12632a0884bdad8c571b0412a7dc4a0bc6b80f3988513e525f913bcb", kill_on_drop: false }`
[INFO] [stdout] 6508c3ce12632a0884bdad8c571b0412a7dc4a0bc6b80f3988513e525f913bcb