[INFO] fetching crate hostname 0.3.1...
[INFO] documenting hostname-0.3.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate hostname 0.3.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate hostname 0.3.1 on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate hostname 0.3.1
[INFO] finished tweaking crates.io crate hostname 0.3.1
[INFO] tweaked toml for crates.io crate hostname 0.3.1 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate hostname 0.3.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "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] 115c2cc73e79d92332a3b8f3846aa92d48aea7ce2e82eaff492d83edbab109a0
[INFO] running `Command { std: "docker" "start" "-a" "115c2cc73e79d92332a3b8f3846aa92d48aea7ce2e82eaff492d83edbab109a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "115c2cc73e79d92332a3b8f3846aa92d48aea7ce2e82eaff492d83edbab109a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "115c2cc73e79d92332a3b8f3846aa92d48aea7ce2e82eaff492d83edbab109a0", kill_on_drop: false }`
[INFO] [stdout] 115c2cc73e79d92332a3b8f3846aa92d48aea7ce2e82eaff492d83edbab109a0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] acbf939222bdceabcc7908748713cc2cdd101594028c85ec9e2a5d6814dac88e
[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" "acbf939222bdceabcc7908748713cc2cdd101594028c85ec9e2a5d6814dac88e", kill_on_drop: false }`
[INFO] [stderr]  Documenting hostname v0.3.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.52s
[INFO] running `Command { std: "docker" "inspect" "acbf939222bdceabcc7908748713cc2cdd101594028c85ec9e2a5d6814dac88e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "acbf939222bdceabcc7908748713cc2cdd101594028c85ec9e2a5d6814dac88e", kill_on_drop: false }`
[INFO] [stdout] acbf939222bdceabcc7908748713cc2cdd101594028c85ec9e2a5d6814dac88e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTC_BOOTSTRAP=1" "-e" "DOCS_RS=1" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "rustdoc" "--lib" "-Zrustdoc-map" "--features" "set" "--frozen" "--message-format=json" "--" "--cfg" "docsrs" "-Z" "unstable-options" "--document-private-items", 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] ed9c7e204564a2de79d152d584352782a1f038b895c44f3022b59a6212e9ebab
[INFO] running `Command { std: "docker" "start" "-a" "ed9c7e204564a2de79d152d584352782a1f038b895c44f3022b59a6212e9ebab", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]     Checking match_cfg v0.1.0
[INFO] [stderr]  Documenting hostname v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0658]: `#[doc(cfg)]` is experimental
[INFO] [stdout]    --> src/lib.rs:142:20
[INFO] [stdout]     |
[INFO] [stdout] 142 | #[cfg_attr(docsrs, doc(cfg(feature = "set")))]
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #43781 <https://github.com/rust-lang/rust/issues/43781> for more information
[INFO] [stdout]     = help: add `#![feature(doc_cfg)]` to the crate attributes to enable
[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 E0658`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `hostname`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name hostname src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="set"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --cfg docsrs -Z unstable-options --document-private-items -C metadata=3984de98d6e34d19 -L dependency=/opt/rustwide/target/debug/deps --extern libc=/opt/rustwide/target/debug/deps/liblibc-2242e8b30f0bacc7.rmeta --extern match_cfg=/opt/rustwide/target/debug/deps/libmatch_cfg-51368766a895da8f.rmeta --extern-html-root-url 'libc=https://docs.rs/libc/0.2.66/' --extern-html-root-url 'match_cfg=https://docs.rs/match_cfg/0.1.0/' -Zunstable-options --crate-version 0.3.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "ed9c7e204564a2de79d152d584352782a1f038b895c44f3022b59a6212e9ebab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ed9c7e204564a2de79d152d584352782a1f038b895c44f3022b59a6212e9ebab", kill_on_drop: false }`
[INFO] [stdout] ed9c7e204564a2de79d152d584352782a1f038b895c44f3022b59a6212e9ebab