[INFO] fetching crate dnsclient 0.1.7...
[INFO] documenting dnsclient-0.1.7 against beta-2020-10-09 for beta-1.48-rustdoc-1
[INFO] extracting crate dnsclient 0.1.7 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate dnsclient 0.1.7 on toolchain beta-2020-10-09
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate dnsclient 0.1.7
[INFO] finished tweaking crates.io crate dnsclient 0.1.7
[INFO] tweaked toml for crates.io crate dnsclient 0.1.7 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded dnssector v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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-2020-10-09" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b203252e13929d51b0299d3d4b2cca43f6767d6a4901e4871c9ccad6a3eb48da
[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" "b203252e13929d51b0299d3d4b2cca43f6767d6a4901e4871c9ccad6a3eb48da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b203252e13929d51b0299d3d4b2cca43f6767d6a4901e4871c9ccad6a3eb48da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b203252e13929d51b0299d3d4b2cca43f6767d6a4901e4871c9ccad6a3eb48da", kill_on_drop: false }`
[INFO] [stdout] b203252e13929d51b0299d3d4b2cca43f6767d6a4901e4871c9ccad6a3eb48da
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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-2020-10-09" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1a78a160d2d4475f0acfcff5f72458ff89666998cd90cee29d301ab182d974a1
[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" "1a78a160d2d4475f0acfcff5f72458ff89666998cd90cee29d301ab182d974a1", kill_on_drop: false }`
[INFO] [stderr]     Checking debug-builders v0.1.0
[INFO] [stderr]    Compiling debugtrace v0.1.0
[INFO] [stderr]     Checking custom_derive v0.1.7
[INFO] [stderr]     Checking bitflags v0.7.0
[INFO] [stderr]    Compiling rustversion v1.0.3
[INFO] [stderr]     Checking either v0.1.7
[INFO] [stderr]    Compiling dbghelp-sys v0.2.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.37
[INFO] [stderr]     Checking futures-lite v1.11.1
[INFO] [stderr]     Checking polling v2.0.2
[INFO] [stderr]     Checking kv-log-macro v1.0.7
[INFO] [stderr]    Compiling thiserror-impl v1.0.21
[INFO] [stderr]     Checking libloading v0.5.2
[INFO] [stderr]     Checking conv v0.3.3
[INFO] [stderr]     Checking async-executor v1.3.0
[INFO] [stderr]     Checking async-io v1.1.10
[INFO] [stderr]     Checking blocking v1.0.2
[INFO] [stderr]     Checking backtrace v0.1.8
[INFO] [stderr]     Checking chomp v0.3.1
[INFO] [stderr]     Checking async-global-executor v1.4.0
[INFO] [stderr]     Checking async-std v1.6.5
[INFO] [stderr]     Checking thiserror v1.0.21
[INFO] [stderr]     Checking dnssector v0.2.0
[INFO] [stderr]  Documenting dnsclient v0.1.7 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_hygiene)]
[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 `dnsclient`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name dnsclient 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 async_std=/opt/rustwide/target/debug/deps/libasync_std-42cfda62c301145b.rmeta --extern dnssector=/opt/rustwide/target/debug/deps/libdnssector-4d26d275399d4242.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-05b22010c1859f50.rmeta --extern rustversion=/opt/rustwide/target/debug/deps/librustversion-511a37bee3ae87de.so --cap-lints=warn --crate-version 0.1.7` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "1a78a160d2d4475f0acfcff5f72458ff89666998cd90cee29d301ab182d974a1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1a78a160d2d4475f0acfcff5f72458ff89666998cd90cee29d301ab182d974a1", kill_on_drop: false }`
[INFO] [stdout] 1a78a160d2d4475f0acfcff5f72458ff89666998cd90cee29d301ab182d974a1
