[INFO] fetching crate spherical-cow 0.1.2...
[INFO] documenting spherical-cow-0.1.2 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate spherical-cow 0.1.2 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate spherical-cow 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 spherical-cow 0.1.2
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate spherical-cow 0.1.2
[INFO] tweaked toml for crates.io crate spherical-cow 0.1.2 written to /workspace/builds/worker-5/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]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] f25f462c1f871385562691a9ba760c5dd5f5996ea974dc6a62009f31e5ed196f
[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" "f25f462c1f871385562691a9ba760c5dd5f5996ea974dc6a62009f31e5ed196f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f25f462c1f871385562691a9ba760c5dd5f5996ea974dc6a62009f31e5ed196f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f25f462c1f871385562691a9ba760c5dd5f5996ea974dc6a62009f31e5ed196f", kill_on_drop: false }`
[INFO] [stdout] f25f462c1f871385562691a9ba760c5dd5f5996ea974dc6a62009f31e5ed196f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] 1441448c7d7c61caabb220384c3ed2192f0167b594de0304c082a89e64bf2ee8
[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" "1441448c7d7c61caabb220384c3ed2192f0167b594de0304c082a89e64bf2ee8", kill_on_drop: false }`
[INFO] [stderr]    Compiling libm v0.1.4
[INFO] [stderr]    Compiling matrixmultiply v0.1.15
[INFO] [stderr]     Checking rawpointer v0.1.0
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]     Checking itertools v0.7.11
[INFO] [stderr]     Checking approx v0.3.2
[INFO] [stderr]     Checking float-cmp v0.4.0
[INFO] [stderr]     Checking generic-array v0.11.1
[INFO] [stderr]     Checking alga v0.7.2
[INFO] [stderr]     Checking nalgebra v0.16.14
[INFO] [stderr]  Documenting spherical-cow 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:58:1
[INFO] [stdout]    |
[INFO] [stdout] 58 | #![feature(vec_remove_item)]
[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 `spherical-cow`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name spherical_cow src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern float_cmp=/opt/rustwide/target/debug/deps/libfloat_cmp-cb1bec0a30e22201.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-433d1b037a7098c7.rmeta --extern nalgebra=/opt/rustwide/target/debug/deps/libnalgebra-d8fc6a25c5e080d8.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-3c099bea820a9d53.rmeta --cap-lints=warn --crate-version 0.1.2` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "1441448c7d7c61caabb220384c3ed2192f0167b594de0304c082a89e64bf2ee8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1441448c7d7c61caabb220384c3ed2192f0167b594de0304c082a89e64bf2ee8", kill_on_drop: false }`
[INFO] [stdout] 1441448c7d7c61caabb220384c3ed2192f0167b594de0304c082a89e64bf2ee8