[INFO] fetching crate kunai 0.4.0...
[INFO] documenting kunai-0.4.0 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate kunai 0.4.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate kunai 0.4.0 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate kunai 0.4.0
[INFO] finished tweaking crates.io crate kunai 0.4.0
[INFO] tweaked toml for crates.io crate kunai 0.4.0 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate kunai 0.4.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e40dc5a36aa08efd364c57bb588d0b71f4bf1a836c59c31c9f50c43203f06411
[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" "e40dc5a36aa08efd364c57bb588d0b71f4bf1a836c59c31c9f50c43203f06411", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e40dc5a36aa08efd364c57bb588d0b71f4bf1a836c59c31c9f50c43203f06411", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e40dc5a36aa08efd364c57bb588d0b71f4bf1a836c59c31c9f50c43203f06411", kill_on_drop: false }`
[INFO] [stdout] e40dc5a36aa08efd364c57bb588d0b71f4bf1a836c59c31c9f50c43203f06411
[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" "+1.47.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ef759ce495bd47a8c7845699eb08984841b3372de9d6a4e81bf717a3dd7728fc
[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" "ef759ce495bd47a8c7845699eb08984841b3372de9d6a4e81bf717a3dd7728fc", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.11
[INFO] [stderr]    Compiling string_cache_shared v0.3.0
[INFO] [stderr]     Checking rustc-ap-graphviz v610.0.0
[INFO] [stderr]    Compiling either v1.5.3
[INFO] [stderr]     Checking new_debug_unreachable v1.0.3
[INFO] [stderr]    Compiling itoa v0.4.4
[INFO] [stderr]    Compiling rustc-ap-rustc_target v610.0.0
[INFO] [stderr]    Compiling procedural-masquerade v0.1.6
[INFO] [stderr]    Compiling rustc-ap-syntax v610.0.0
[INFO] [stderr]     Checking unicode-xid v0.2.0
[INFO] [stderr]    Compiling rustfmt-nightly v1.4.11
[INFO] [stderr]     Checking thin-slice v0.1.1
[INFO] [stderr]     Checking bytecount v0.6.0
[INFO] [stderr]     Checking unicode_categories v0.1.1
[INFO] [stderr]     Checking diff v0.1.12
[INFO] [stderr]     Checking ego-tree v0.6.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rustc-ap-graphviz-610.0.0/lib.rs:277:1
[INFO] [stdout]     |
[INFO] [stdout] 277 | #![feature(rustc_private, nll)]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking home v0.5.1
[INFO] [stderr]     Checking itertools v0.8.2
[INFO] [stderr]     Checking unicode-normalization v0.1.11
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr] error: could not compile `rustc-ap-graphviz`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "ef759ce495bd47a8c7845699eb08984841b3372de9d6a4e81bf717a3dd7728fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef759ce495bd47a8c7845699eb08984841b3372de9d6a4e81bf717a3dd7728fc", kill_on_drop: false }`
[INFO] [stdout] ef759ce495bd47a8c7845699eb08984841b3372de9d6a4e81bf717a3dd7728fc
