[INFO] fetching crate ramp 0.5.9...
[INFO] documenting ramp-0.5.9 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate ramp 0.5.9 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate ramp 0.5.9 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 ramp 0.5.9
[INFO] finished tweaking crates.io crate ramp 0.5.9
[INFO] tweaked toml for crates.io crate ramp 0.5.9 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate crates.io crate ramp 0.5.9 already has a lockfile, it will not be regenerated
[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 ieee754 v0.2.2
[INFO] [stderr]   Downloaded rand v0.4.1
[INFO] [stderr]   Downloaded rust-gmp v0.2.10
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 2d71f307d990ef7b5a174562feceee4cb7b2473a34fb780340e476008c0907d9
[INFO] running `Command { std: "docker" "start" "-a" "2d71f307d990ef7b5a174562feceee4cb7b2473a34fb780340e476008c0907d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2d71f307d990ef7b5a174562feceee4cb7b2473a34fb780340e476008c0907d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d71f307d990ef7b5a174562feceee4cb7b2473a34fb780340e476008c0907d9", kill_on_drop: false }`
[INFO] [stdout] 2d71f307d990ef7b5a174562feceee4cb7b2473a34fb780340e476008c0907d9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 3d8cbe0b605d8d1b32769725ce1181951c3f3e03d63156ca2800e4334c43e9e7
[INFO] running `Command { std: "docker" "start" "-a" "3d8cbe0b605d8d1b32769725ce1181951c3f3e03d63156ca2800e4334c43e9e7", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling num-traits v0.1.40
[INFO] [stderr]    Compiling libc v0.2.29
[INFO] [stderr]    Compiling rustc-cfg v0.2.0
[INFO] [stderr]    Compiling cc v1.0.17
[INFO] [stderr]     Checking rand_core v0.2.1
[INFO] [stderr]     Checking ieee754 v0.2.2
[INFO] [stderr]     Checking hamming v0.1.3
[INFO] [stderr]    Compiling num-integer v0.1.35
[INFO] [stderr]     Checking rand v0.5.4
[INFO] [stderr]    Compiling rand v0.3.16
[INFO] [stderr]    Compiling num-bigint v0.1.40
[INFO] [stderr]    Compiling ramp v0.5.9 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting ramp v0.5.9 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:17:1
[INFO] [stdout]    |
[INFO] [stdout] 17 | #![feature(core_intrinsics, asm, allocator_api)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:18:1
[INFO] [stdout]    |
[INFO] [stdout] 18 | #![feature(step_trait, step_trait_ext, ptr_internals, raw_vec_internals)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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 `ramp`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name ramp 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 hamming=/opt/rustwide/target/debug/deps/libhamming-8685938f868dcda3.rmeta --extern ieee754=/opt/rustwide/target/debug/deps/libieee754-8918bea96f3549bd.rmeta --extern num_integer=/opt/rustwide/target/debug/deps/libnum_integer-d8fb69fb961146ed.rmeta --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-3b2ff62a7dcfdff4.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-3b393b30daafa95f.rmeta --cap-lints=warn --crate-version 0.5.9` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "3d8cbe0b605d8d1b32769725ce1181951c3f3e03d63156ca2800e4334c43e9e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3d8cbe0b605d8d1b32769725ce1181951c3f3e03d63156ca2800e4334c43e9e7", kill_on_drop: false }`
[INFO] [stdout] 3d8cbe0b605d8d1b32769725ce1181951c3f3e03d63156ca2800e4334c43e9e7