[INFO] fetching crate nyar_valkyrie 0.0.8...
[INFO] documenting nyar_valkyrie-0.0.8 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate nyar_valkyrie 0.0.8 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate nyar_valkyrie 0.0.8 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 nyar_valkyrie 0.0.8
[INFO] finished tweaking crates.io crate nyar_valkyrie 0.0.8
[INFO] tweaked toml for crates.io crate nyar_valkyrie 0.0.8 written to /workspace/builds/worker-4/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 nyar_ast v0.0.8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 325b06664fbb7a20619863229013c60fb576b287633ab7bbd2ff30cea91219da
[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" "325b06664fbb7a20619863229013c60fb576b287633ab7bbd2ff30cea91219da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "325b06664fbb7a20619863229013c60fb576b287633ab7bbd2ff30cea91219da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "325b06664fbb7a20619863229013c60fb576b287633ab7bbd2ff30cea91219da", kill_on_drop: false }`
[INFO] [stdout] 325b06664fbb7a20619863229013c60fb576b287633ab7bbd2ff30cea91219da
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 8037ef8756ff5cb7a24ca96e09baafdeb991f81c58178dfaa60b384916e17bd5
[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" "8037ef8756ff5cb7a24ca96e09baafdeb991f81c58178dfaa60b384916e17bd5", kill_on_drop: false }`
[INFO] [stderr]     Checking num-complex v0.2.4
[INFO] [stderr]     Checking num-bigint v0.2.6
[INFO] [stderr]     Checking num-rational v0.2.4
[INFO] [stderr]     Checking num v0.2.1
[INFO] [stderr]     Checking nyar_ast v0.0.8
[INFO] [stderr]  Documenting nyar_valkyrie v0.0.8 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(format_args_nl)]
[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 `nyar_valkyrie`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name nyar_valkyrie 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 lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-db88f49d9e5662e7.rmeta --extern nyar_ast=/opt/rustwide/target/debug/deps/libnyar_ast-80d6c51843b7737c.rmeta --extern pest=/opt/rustwide/target/debug/deps/libpest-2de5595cb6b09a5a.rmeta --cap-lints=warn --crate-version 0.0.8` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "8037ef8756ff5cb7a24ca96e09baafdeb991f81c58178dfaa60b384916e17bd5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8037ef8756ff5cb7a24ca96e09baafdeb991f81c58178dfaa60b384916e17bd5", kill_on_drop: false }`
[INFO] [stdout] 8037ef8756ff5cb7a24ca96e09baafdeb991f81c58178dfaa60b384916e17bd5