[INFO] fetching crate teatree 0.0.4...
[INFO] documenting teatree-0.0.4 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate teatree 0.0.4 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate teatree 0.0.4 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate teatree 0.0.4
[INFO] finished tweaking crates.io crate teatree 0.0.4
[INFO] tweaked toml for crates.io crate teatree 0.0.4 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded sha3 v0.7.3
[INFO] [stderr]   Downloaded pagecache v0.17.0
[INFO] [stderr]   Downloaded jsonrpc-parse v0.1.2
[INFO] [stderr]   Downloaded sled v0.24.1
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2835552a991bb1b254f8904b26a028fb301a816ab1c4c4872d449daf51535000
[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" "2835552a991bb1b254f8904b26a028fb301a816ab1c4c4872d449daf51535000", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2835552a991bb1b254f8904b26a028fb301a816ab1c4c4872d449daf51535000", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2835552a991bb1b254f8904b26a028fb301a816ab1c4c4872d449daf51535000", kill_on_drop: false }`
[INFO] [stdout] 2835552a991bb1b254f8904b26a028fb301a816ab1c4c4872d449daf51535000
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e4934d089f7e886907817077398cbebc90ac8404b5f5b5424929e122e4f745bb
[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" "e4934d089f7e886907817077398cbebc90ac8404b5f5b5424929e122e4f745bb", kill_on_drop: false }`
[INFO] [stderr]     Checking byte-tools v0.2.0
[INFO] [stderr]     Checking historian v4.0.4
[INFO] [stderr]    Compiling hashbrown v0.6.3
[INFO] [stderr]     Checking actix-service v0.4.2
[INFO] [stderr]     Checking lock_api v0.2.0
[INFO] [stderr]     Checking fxhash v0.2.1
[INFO] [stderr]     Checking base64 v0.10.1
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking getrandom v0.1.16
[INFO] [stderr]     Checking hostname v0.3.1
[INFO] [stderr]    Compiling parking_lot_core v0.5.0
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]    Compiling parking_lot v0.8.0
[INFO] [stderr]     Checking fs2 v0.4.3
[INFO] [stderr]     Checking dirs v1.0.5
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]     Checking generic-array v0.9.1
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking threadpool v1.8.1
[INFO] [stderr]     Checking backtrace v0.3.61
[INFO] [stderr]     Checking block-buffer v0.3.3
[INFO] [stderr]     Checking resolv-conf v0.6.3
[INFO] [stderr]     Checking parking_lot_core v0.6.2
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]    Compiling derive_more v0.15.0
[INFO] [stderr]    Compiling enum-as-inner v0.2.1
[INFO] [stderr]    Compiling derive_more v0.14.1
[INFO] [stderr]    Compiling actix_derive v0.4.0
[INFO] [stderr]     Checking tokio-threadpool v0.1.18
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]    Compiling const-random-macro v0.1.13
[INFO] [stderr]     Checking rayon-core v1.9.1
[INFO] [stderr]     Checking hashbrown v0.3.1
[INFO] [stderr]     Checking serde_bytes v0.11.5
[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking ed25519 v1.2.0
[INFO] [stderr]     Checking toml v0.5.8
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking digest v0.7.6
[INFO] [stderr]     Checking parking_lot v0.9.0
[INFO] [stderr]     Checking tokio-io v0.1.13
[INFO] [stderr]     Checking http v0.1.21
[INFO] [stderr]     Checking string v0.2.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking curve25519-dalek v3.2.0
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking sha3 v0.7.3
[INFO] [stderr]     Checking rayon v1.5.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking tokio-codec v0.1.2
[INFO] [stderr]     Checking tokio-reactor v0.1.12
[INFO] [stderr]     Checking tokio-fs v0.1.7
[INFO] [stderr]     Checking const-random v0.1.13
[INFO] [stderr]     Checking actix-codec v0.1.2
[INFO] [stderr]     Checking ahash v0.2.19
[INFO] [stderr]     Checking actix-utils v0.4.7
[INFO] [stderr]     Checking tokio-tcp v0.1.4
[INFO] [stderr]     Checking tokio-udp v0.1.6
[INFO] [stderr]     Checking tokio-uds v0.2.7
[INFO] [stderr]     Checking actix-server-config v0.1.2
[INFO] [stderr]     Checking trust-dns-proto v0.7.4
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stderr]     Checking ed25519-dalek v1.0.1
[INFO] [stderr]     Checking h2 v0.1.26
[INFO] [stderr]     Checking jsonrpc-parse v0.1.2
[INFO] [stderr]     Checking pagecache v0.17.0
[INFO] [stderr]     Checking trust-dns-resolver v0.11.1
[INFO] [stderr]     Checking actix-threadpool v0.1.2
[INFO] [stderr]     Checking sled v0.24.1
[INFO] [stderr]     Checking actix-rt v0.2.6
[INFO] [stderr]     Checking actix-connect v0.2.5
[INFO] [stderr]     Checking actix-http v0.2.11
[INFO] [stderr]     Checking actix v0.8.3
[INFO] [stderr]  Documenting teatree v0.0.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(vec_drain_as_slice)]
[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 `teatree`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name teatree 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 actix=/opt/rustwide/target/debug/deps/libactix-51c0e862d6c7d3dd.rmeta --extern actix_derive=/opt/rustwide/target/debug/deps/libactix_derive-35262714e78d24f0.so --extern bincode=/opt/rustwide/target/debug/deps/libbincode-27a85d68349d73d1.rmeta --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-ad1d09bc25abc1b9.rmeta --extern bytes=/opt/rustwide/target/debug/deps/libbytes-6b69659421180917.rmeta --extern dirs=/opt/rustwide/target/debug/deps/libdirs-d14b227c0826b107.rmeta --extern ed25519_dalek=/opt/rustwide/target/debug/deps/libed25519_dalek-3b7ea2d6b960639a.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-dacc1e45b0e53b0c.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-533cf53875604e8f.rmeta --extern jsonrpc_parse=/opt/rustwide/target/debug/deps/libjsonrpc_parse-d9c580bba9216b22.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-b62d303a4044400e.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-f34436159fac0af7.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-f282cc1f57f3d638.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-15555f2003f0c506.rmeta --extern sha3=/opt/rustwide/target/debug/deps/libsha3-8bb14aa0ff4d7061.rmeta --extern sled=/opt/rustwide/target/debug/deps/libsled-938c118151e8031c.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-be54964eae7adc51.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-a0392c9c9f84711e.rmeta --cap-lints=warn --crate-version 0.0.4` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "e4934d089f7e886907817077398cbebc90ac8404b5f5b5424929e122e4f745bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e4934d089f7e886907817077398cbebc90ac8404b5f5b5424929e122e4f745bb", kill_on_drop: false }`
[INFO] [stdout] e4934d089f7e886907817077398cbebc90ac8404b5f5b5424929e122e4f745bb
