[INFO] fetching crate parse_torrent 0.5.2...
[INFO] documenting parse_torrent-0.5.2 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate parse_torrent 0.5.2 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate parse_torrent 0.5.2 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 parse_torrent 0.5.2
[INFO] finished tweaking crates.io crate parse_torrent 0.5.2
[INFO] tweaked toml for crates.io crate parse_torrent 0.5.2 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde_bencode v0.1.3
[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" "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] c58997cfdfcf120415aaa3412719007b1c4be70448d11627024037a527aa4bb4
[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" "c58997cfdfcf120415aaa3412719007b1c4be70448d11627024037a527aa4bb4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c58997cfdfcf120415aaa3412719007b1c4be70448d11627024037a527aa4bb4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c58997cfdfcf120415aaa3412719007b1c4be70448d11627024037a527aa4bb4", kill_on_drop: false }`
[INFO] [stdout] c58997cfdfcf120415aaa3412719007b1c4be70448d11627024037a527aa4bb4
[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" "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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] fb5967e26727a2dc52512c8fc305ed660055e4eee3f12037d016492ad55276c4
[INFO] running `Command { std: "docker" "start" "-a" "fb5967e26727a2dc52512c8fc305ed660055e4eee3f12037d016492ad55276c4", kill_on_drop: false }`
[INFO] [stderr]     Checking serde_bytes v0.10.5
[INFO] [stderr]     Checking bencode v0.1.16
[INFO] [stderr]     Checking bincode v0.6.1
[INFO] [stderr]     Checking chrono v0.3.0
[INFO] [stderr]     Checking serde_bencode v0.1.3
[INFO] [stderr]  Documenting parse_torrent v0.5.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(proc_macro)] // Rust nightly
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `parse_torrent`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name parse_torrent src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern bencode=/opt/rustwide/target/debug/deps/libbencode-c6d5e348235ddbb9.rmeta --extern bincode=/opt/rustwide/target/debug/deps/libbincode-04beac113907a8fd.rmeta --extern chrono=/opt/rustwide/target/debug/deps/libchrono-6fb37e29fe9d8433.rmeta --extern crypto=/opt/rustwide/target/debug/deps/libcrypto-3dca84d7ed372bb7.rmeta --extern rustc_serialize=/opt/rustwide/target/debug/deps/librustc_serialize-eddfb9427ca0b1f2.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-40de85e2d68f0998.rmeta --extern serde_bencode=/opt/rustwide/target/debug/deps/libserde_bencode-073e54d4dd846ac2.rmeta --extern serde_bytes=/opt/rustwide/target/debug/deps/libserde_bytes-1ef2863a212e27af.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-d5f0ab5be9261087.so --extern sha1=/opt/rustwide/target/debug/deps/libsha1-2cd8af4c67eb8ecd.rmeta --cap-lints=warn --crate-version 0.5.2` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "fb5967e26727a2dc52512c8fc305ed660055e4eee3f12037d016492ad55276c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb5967e26727a2dc52512c8fc305ed660055e4eee3f12037d016492ad55276c4", kill_on_drop: false }`
[INFO] [stdout] fb5967e26727a2dc52512c8fc305ed660055e4eee3f12037d016492ad55276c4