[INFO] fetching crate ratchet 1.2.0...
[INFO] documenting ratchet-1.2.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate ratchet 1.2.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate ratchet 1.2.0 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 ratchet 1.2.0
[INFO] finished tweaking crates.io crate ratchet 1.2.0
[INFO] tweaked toml for crates.io crate ratchet 1.2.0 written to /workspace/builds/worker-3/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] 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_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] 6bc34fb7a9628066d42daf3f4eab7ceaaa372aba8162e6a492e164f932f5a3ca
[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" "6bc34fb7a9628066d42daf3f4eab7ceaaa372aba8162e6a492e164f932f5a3ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6bc34fb7a9628066d42daf3f4eab7ceaaa372aba8162e6a492e164f932f5a3ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6bc34fb7a9628066d42daf3f4eab7ceaaa372aba8162e6a492e164f932f5a3ca", kill_on_drop: false }`
[INFO] [stdout] 6bc34fb7a9628066d42daf3f4eab7ceaaa372aba8162e6a492e164f932f5a3ca
[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] 7506d8911eb0dd14632bf690e0f5172c72b629a6fd9817154e693e6655bd10df
[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" "7506d8911eb0dd14632bf690e0f5172c72b629a6fd9817154e693e6655bd10df", kill_on_drop: false }`
[INFO] [stderr]    Compiling clear_on_drop v0.2.4
[INFO] [stderr]  Documenting ratchet v1.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:23:1
[INFO] [stdout]    |
[INFO] [stdout] 23 | #![feature(trusted_len, generator_trait, never_type,)]
[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 E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `ratchet`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name ratchet 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 clear_on_drop=/opt/rustwide/target/debug/deps/libclear_on_drop-649d00b9308832d8.rmeta --extern digest=/opt/rustwide/target/debug/deps/libdigest-ad8d847ce95708dc.rmeta --extern hkdf=/opt/rustwide/target/debug/deps/libhkdf-172b50bcf304bc33.rmeta --extern rand_core=/opt/rustwide/target/debug/deps/librand_core-2cba140c6b037bc0.rmeta --cap-lints=warn --crate-version 1.2.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "7506d8911eb0dd14632bf690e0f5172c72b629a6fd9817154e693e6655bd10df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7506d8911eb0dd14632bf690e0f5172c72b629a6fd9817154e693e6655bd10df", kill_on_drop: false }`
[INFO] [stdout] 7506d8911eb0dd14632bf690e0f5172c72b629a6fd9817154e693e6655bd10df