[INFO] fetching crate mdbook-plantuml 0.6.0-beta...
[INFO] documenting mdbook-plantuml-0.6.0-beta against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate mdbook-plantuml 0.6.0-beta into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate mdbook-plantuml 0.6.0-beta 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 crates.io crate mdbook-plantuml 0.6.0-beta
[INFO] finished tweaking crates.io crate mdbook-plantuml 0.6.0-beta
[INFO] tweaked toml for crates.io crate mdbook-plantuml 0.6.0-beta written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate crates.io crate mdbook-plantuml 0.6.0-beta 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 }`
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[INFO] [stdout] b639b5640358b95df2e3bcbc44fbcc3da1a8bab77e4f802cc12f16617c6e9677
[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" "b639b5640358b95df2e3bcbc44fbcc3da1a8bab77e4f802cc12f16617c6e9677", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b639b5640358b95df2e3bcbc44fbcc3da1a8bab77e4f802cc12f16617c6e9677", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b639b5640358b95df2e3bcbc44fbcc3da1a8bab77e4f802cc12f16617c6e9677", kill_on_drop: false }`
[INFO] [stdout] b639b5640358b95df2e3bcbc44fbcc3da1a8bab77e4f802cc12f16617c6e9677
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] dfdc7bc737870e8201067c35a29645e60cc9ec8ae78bb32cf322c78ccc2710ac
[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" "dfdc7bc737870e8201067c35a29645e60cc9ec8ae78bb32cf322c78ccc2710ac", kill_on_drop: false }`
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[INFO] [stderr]  Documenting mdbook-plantuml v0.6.0-beta (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]   --> src/markdown_plantuml_pipeline.rs:75:13
[INFO] [stdout]    |
[INFO] [stdout] 75 |             (c == b'`' || c == b'~')
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3m 41s
[INFO] running `Command { std: "docker" "inspect" "dfdc7bc737870e8201067c35a29645e60cc9ec8ae78bb32cf322c78ccc2710ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dfdc7bc737870e8201067c35a29645e60cc9ec8ae78bb32cf322c78ccc2710ac", kill_on_drop: false }`
[INFO] [stdout] dfdc7bc737870e8201067c35a29645e60cc9ec8ae78bb32cf322c78ccc2710ac