[INFO] fetching crate persistentcache_procmacro 0.0.3...
[INFO] documenting persistentcache_procmacro-0.0.3 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate persistentcache_procmacro 0.0.3 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate persistentcache_procmacro 0.0.3 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 persistentcache_procmacro 0.0.3
[INFO] finished tweaking crates.io crate persistentcache_procmacro 0.0.3
[INFO] tweaked toml for crates.io crate persistentcache_procmacro 0.0.3 written to /workspace/builds/worker-13/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] [stderr]     Blocking waiting for file lock on package cache
[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] warning: only one of `license` or `license-file` is necessary
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] e593d324678c47c09ed2d3375f346a6ad50917d5d02628716f4a5b6373132458
[INFO] running `Command { std: "docker" "start" "-a" "e593d324678c47c09ed2d3375f346a6ad50917d5d02628716f4a5b6373132458", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e593d324678c47c09ed2d3375f346a6ad50917d5d02628716f4a5b6373132458", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e593d324678c47c09ed2d3375f346a6ad50917d5d02628716f4a5b6373132458", kill_on_drop: false }`
[INFO] [stdout] e593d324678c47c09ed2d3375f346a6ad50917d5d02628716f4a5b6373132458
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] ddd3f3c7fc6f872fb8b86461698cf8f9ca84a25ce640317b23aebef529040911
[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" "ddd3f3c7fc6f872fb8b86461698cf8f9ca84a25ce640317b23aebef529040911", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: only one of `license` or `license-file` is necessary
[INFO] [stderr]     Checking proc-macro2 v0.1.10
[INFO] [stderr]     Checking futures-await-quote v0.4.0
[INFO] [stderr]     Checking futures-await-synom v0.12.0
[INFO] [stderr]     Checking futures-await-syn v0.12.0
[INFO] [stderr]  Documenting persistentcache_procmacro v0.0.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(proc_macro)]
[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 `persistentcache_procmacro`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type proc-macro --crate-name persistentcache_procmacro 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 bincode=/opt/rustwide/target/debug/deps/libbincode-e6e3d5e940c1e286.rmeta --extern futures_await_quote=/opt/rustwide/target/debug/deps/libfutures_await_quote-0f362a583dccaadf.rmeta --extern futures_await_syn=/opt/rustwide/target/debug/deps/libfutures_await_syn-b6333011159756a9.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-db88f49d9e5662e7.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-e2b55f3fa9b89984.rmeta --extern synom=/opt/rustwide/target/debug/deps/libsynom-8b362dab8bba4c0d.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.0.3` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "ddd3f3c7fc6f872fb8b86461698cf8f9ca84a25ce640317b23aebef529040911", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ddd3f3c7fc6f872fb8b86461698cf8f9ca84a25ce640317b23aebef529040911", kill_on_drop: false }`
[INFO] [stdout] ddd3f3c7fc6f872fb8b86461698cf8f9ca84a25ce640317b23aebef529040911