[INFO] fetching crate ed 0.1.5...
[INFO] documenting ed-0.1.5 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate ed 0.1.5 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate ed 0.1.5 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 ed 0.1.5
[INFO] finished tweaking crates.io crate ed 0.1.5
[INFO] tweaked toml for crates.io crate ed 0.1.5 written to /workspace/builds/worker-5/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 ed-derive v0.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] 2c718becc83730fec1f5d82ae1e0deb16dd652f57352df45010fdaa16626e2a9
[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" "2c718becc83730fec1f5d82ae1e0deb16dd652f57352df45010fdaa16626e2a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2c718becc83730fec1f5d82ae1e0deb16dd652f57352df45010fdaa16626e2a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c718becc83730fec1f5d82ae1e0deb16dd652f57352df45010fdaa16626e2a9", kill_on_drop: false }`
[INFO] [stdout] 2c718becc83730fec1f5d82ae1e0deb16dd652f57352df45010fdaa16626e2a9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] ca6b0e418aaedf85a25bf4439dc8827bcbe49641bf76556719c51cf33b2d6a64
[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" "ca6b0e418aaedf85a25bf4439dc8827bcbe49641bf76556719c51cf33b2d6a64", kill_on_drop: false }`
[INFO] [stderr]    Compiling seq-macro v0.1.5
[INFO] [stderr]    Compiling ed-derive v0.1.1
[INFO] [stderr]  Documenting ed v0.1.5 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:69:1
[INFO] [stdout]    |
[INFO] [stdout] 69 | #![feature(optin_builtin_traits)]
[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 `ed`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name ed 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 ed_derive=/opt/rustwide/target/debug/deps/libed_derive-3e91ab33e657fe4b.so --extern failure=/opt/rustwide/target/debug/deps/libfailure-3d0ba9b30d5da469.rmeta --extern seq_macro=/opt/rustwide/target/debug/deps/libseq_macro-e66e9d85c7e37d2b.so --cap-lints=warn --crate-version 0.1.5` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "ca6b0e418aaedf85a25bf4439dc8827bcbe49641bf76556719c51cf33b2d6a64", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ca6b0e418aaedf85a25bf4439dc8827bcbe49641bf76556719c51cf33b2d6a64", kill_on_drop: false }`
[INFO] [stdout] ca6b0e418aaedf85a25bf4439dc8827bcbe49641bf76556719c51cf33b2d6a64