[INFO] cloning repository https://github.com/sakamoto-hands-on/Rust_socket-programming
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sakamoto-hands-on/Rust_socket-programming" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsakamoto-hands-on%2FRust_socket-programming", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsakamoto-hands-on%2FRust_socket-programming'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 47d68ab8920fee0f84a81d176259d2e49340c04b
[INFO] documenting sakamoto-hands-on/Rust_socket-programming 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%2Fsakamoto-hands-on%2FRust_socket-programming" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sakamoto-hands-on/Rust_socket-programming 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/sakamoto-hands-on/Rust_socket-programming
[INFO] finished tweaking git repo https://github.com/sakamoto-hands-on/Rust_socket-programming
[INFO] tweaked toml for git repo https://github.com/sakamoto-hands-on/Rust_socket-programming written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/sakamoto-hands-on/Rust_socket-programming 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-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] [stdout] 4409e4d3f7287da3ea40d27d28e87d5d813c531c47c230da96b561c20ff3b8bc
[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" "4409e4d3f7287da3ea40d27d28e87d5d813c531c47c230da96b561c20ff3b8bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4409e4d3f7287da3ea40d27d28e87d5d813c531c47c230da96b561c20ff3b8bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4409e4d3f7287da3ea40d27d28e87d5d813c531c47c230da96b561c20ff3b8bc", kill_on_drop: false }`
[INFO] [stdout] 4409e4d3f7287da3ea40d27d28e87d5d813c531c47c230da96b561c20ff3b8bc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] cdd5ccd93ab130f0aaaa8929ae4ca019db968b21e4797831e658b27f7dceb403
[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" "cdd5ccd93ab130f0aaaa8929ae4ca019db968b21e4797831e658b27f7dceb403", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling cc v1.0.46
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]     Checking env_logger v0.6.2
[INFO] [stderr]    Compiling backtrace-sys v0.1.32
[INFO] [stderr]     Checking backtrace v0.3.40
[INFO] [stderr]    Compiling synstructure v0.12.1
[INFO] [stderr]    Compiling failure_derive v0.1.6
[INFO] [stderr]     Checking failure v0.1.6
[INFO] [stderr]  Documenting socket-programming v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: expected one of `!` or `::`, found `<eof>`
[INFO] [stdout]  --> src/udp_client.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | test
[INFO] [stdout]   | ^^^^ expected one of `!` or `::`
[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] [stderr] error: Could not document `socket-programming`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name socket_programming 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 --extern env_logger=/opt/rustwide/target/debug/deps/libenv_logger-3013c67b8c2e2bc6.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-28d954cede8e1a02.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-69d9a7f018cb28c7.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "cdd5ccd93ab130f0aaaa8929ae4ca019db968b21e4797831e658b27f7dceb403", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cdd5ccd93ab130f0aaaa8929ae4ca019db968b21e4797831e658b27f7dceb403", kill_on_drop: false }`
[INFO] [stdout] cdd5ccd93ab130f0aaaa8929ae4ca019db968b21e4797831e658b27f7dceb403