[INFO] fetching crate pumpkinscript 0.2.0...
[INFO] documenting pumpkinscript-0.2.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate pumpkinscript 0.2.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate pumpkinscript 0.2.0 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 pumpkinscript 0.2.0
[INFO] finished tweaking crates.io crate pumpkinscript 0.2.0
[INFO] tweaked toml for crates.io crate pumpkinscript 0.2.0 written to /workspace/builds/worker-0/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-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] 6aeb7e869e5eac5024bd912e00b8fa29f10c708d059e0e641922d3a0c7c1816a
[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" "6aeb7e869e5eac5024bd912e00b8fa29f10c708d059e0e641922d3a0c7c1816a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6aeb7e869e5eac5024bd912e00b8fa29f10c708d059e0e641922d3a0c7c1816a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6aeb7e869e5eac5024bd912e00b8fa29f10c708d059e0e641922d3a0c7c1816a", kill_on_drop: false }`
[INFO] [stdout] 6aeb7e869e5eac5024bd912e00b8fa29f10c708d059e0e641922d3a0c7c1816a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] 83918b003a4e4db3603b63b8cf64764390cc78ecd5649e3f377cffe029ba2056
[INFO] running `Command { std: "docker" "start" "-a" "83918b003a4e4db3603b63b8cf64764390cc78ecd5649e3f377cffe029ba2056", kill_on_drop: false }`
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]  Documenting pumpkinscript v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:61:1
[INFO] [stdout]    |
[INFO] [stdout] 61 | #![feature(try_from)]
[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 `pumpkinscript`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name pumpkinscript 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 byteorder=/opt/rustwide/target/debug/deps/libbyteorder-364c148656283980.rmeta --extern nom=/opt/rustwide/target/debug/deps/libnom-4b0504c59f3abb24.rmeta --extern num_bigint=/opt/rustwide/target/debug/deps/libnum_bigint-20906d1c4ab36b99.rmeta --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-996ecac5420b3288.rmeta --cap-lints=warn --crate-version 0.2.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "83918b003a4e4db3603b63b8cf64764390cc78ecd5649e3f377cffe029ba2056", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "83918b003a4e4db3603b63b8cf64764390cc78ecd5649e3f377cffe029ba2056", kill_on_drop: false }`
[INFO] [stdout] 83918b003a4e4db3603b63b8cf64764390cc78ecd5649e3f377cffe029ba2056