[INFO] fetching crate rustep 0.1.2...
[INFO] documenting rustep-0.1.2 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate rustep 0.1.2 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate rustep 0.1.2 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 rustep 0.1.2
[INFO] finished tweaking crates.io crate rustep 0.1.2
[INFO] tweaked toml for crates.io crate rustep 0.1.2 written to /workspace/builds/worker-7/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 enumflags_derive v0.4.1
[INFO] [stderr]   Downloaded enumflags v0.3.2
[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-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 458d59532e381b6cb2c6c92443c49b4537009d05017056bec5bd9985ab2deb22
[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" "458d59532e381b6cb2c6c92443c49b4537009d05017056bec5bd9985ab2deb22", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "458d59532e381b6cb2c6c92443c49b4537009d05017056bec5bd9985ab2deb22", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "458d59532e381b6cb2c6c92443c49b4537009d05017056bec5bd9985ab2deb22", kill_on_drop: false }`
[INFO] [stdout] 458d59532e381b6cb2c6c92443c49b4537009d05017056bec5bd9985ab2deb22
[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-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d09f8b40c5af973903a8b7514ebee11143e6261b9cb562062c6c23c8642f5800
[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" "d09f8b40c5af973903a8b7514ebee11143e6261b9cb562062c6c23c8642f5800", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking enumflags v0.3.2
[INFO] [stderr]    Compiling proc-macro2 v0.2.3
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking memchr v1.0.2
[INFO] [stderr]     Checking nom v3.2.1
[INFO] [stderr]    Compiling quote v0.4.2
[INFO] [stderr]    Compiling syn v0.12.15
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]    Compiling enumflags_derive v0.4.1
[INFO] [stderr]  Documenting rustep v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:49:1
[INFO] [stdout]    |
[INFO] [stdout] 49 | #![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 `rustep`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name rustep 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 enumflags=/opt/rustwide/target/debug/deps/libenumflags-44e35fec7c8c7bb5.rmeta --extern enumflags_derive=/opt/rustwide/target/debug/deps/libenumflags_derive-1fa8dbf404f93eee.so --extern failure=/opt/rustwide/target/debug/deps/libfailure-eb6adc73bba0a487.rmeta --extern nom=/opt/rustwide/target/debug/deps/libnom-60052bd41b57d492.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-d76dabea52224d8c.rmeta --extern num_derive=/opt/rustwide/target/debug/deps/libnum_derive-1a959f44885e056e.so --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-b5dbcc2daa2e7df6.rmeta --cap-lints=warn --crate-version 0.1.2` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "d09f8b40c5af973903a8b7514ebee11143e6261b9cb562062c6c23c8642f5800", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d09f8b40c5af973903a8b7514ebee11143e6261b9cb562062c6c23c8642f5800", kill_on_drop: false }`
[INFO] [stdout] d09f8b40c5af973903a8b7514ebee11143e6261b9cb562062c6c23c8642f5800