[INFO] fetching crate teatree 0.0.4...
[INFO] documenting teatree-0.0.4 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate teatree 0.0.4 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate teatree 0.0.4 on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "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-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded generic-array v0.9.1
[INFO] [stderr]   Downloaded historian v4.0.4
[INFO] [stderr]   Downloaded sled v0.24.1
[INFO] [stderr]   Downloaded jsonrpc-parse v0.1.2
[INFO] [stderr]   Downloaded pagecache v0.17.0
[INFO] [stderr]   Downloaded sha3 v0.7.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 886258c549c9b56479a6a03e2bc529e55021279e3be514c313e652de17fb4079
[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" "886258c549c9b56479a6a03e2bc529e55021279e3be514c313e652de17fb4079", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "886258c549c9b56479a6a03e2bc529e55021279e3be514c313e652de17fb4079", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "886258c549c9b56479a6a03e2bc529e55021279e3be514c313e652de17fb4079", kill_on_drop: false }`
[INFO] [stdout] 886258c549c9b56479a6a03e2bc529e55021279e3be514c313e652de17fb4079
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "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] 147ebb6a57d030b0c60a88b67aa129e6aa3466726de6ac074a73b00913f17f67
[INFO] running `Command { std: "docker" "start" "-a" "147ebb6a57d030b0c60a88b67aa129e6aa3466726de6ac074a73b00913f17f67", kill_on_drop: false }`
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[INFO] [stderr]    Compiling synstructure v0.12.6
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[INFO] [stderr]    Compiling zeroize_derive v1.3.2
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking zeroize v1.3.0
[INFO] [stderr]     Checking curve25519-dalek v3.2.1
[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 trust-dns-proto v0.7.4
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[INFO] [stderr]     Checking hashbrown v0.3.1
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[INFO] [stderr]     Checking serde_bytes v0.11.6
[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[INFO] [stderr]     Checking ed25519 v1.5.2
[INFO] [stderr]     Checking toml v0.5.9
[INFO] [stderr]     Checking ed25519-dalek v1.0.1
[INFO] [stderr]     Checking pagecache v0.17.0
[INFO] [stderr]     Checking actix-http v0.2.11
[INFO] [stderr]     Checking jsonrpc-parse v0.1.2
[INFO] [stderr]     Checking sled v0.24.1
[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:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(vec_drain_as_slice)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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] 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,artifacts,future-incompat --document-private-items -C metadata=a3448a131dfaaf7e -L dependency=/opt/rustwide/target/debug/deps --extern actix=/opt/rustwide/target/debug/deps/libactix-50d92818f8728c1c.rmeta --extern actix_derive=/opt/rustwide/target/debug/deps/libactix_derive-385e858c71378518.so --extern bincode=/opt/rustwide/target/debug/deps/libbincode-0196ea85ac435ffa.rmeta --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-b0e216414bfe58b6.rmeta --extern bytes=/opt/rustwide/target/debug/deps/libbytes-0f4fc6f624e76385.rmeta --extern dirs=/opt/rustwide/target/debug/deps/libdirs-cd8b88093717f63e.rmeta --extern ed25519_dalek=/opt/rustwide/target/debug/deps/libed25519_dalek-3db2d96959a242a0.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-c72c35609420e95d.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-34937b916995a2ad.rmeta --extern jsonrpc_parse=/opt/rustwide/target/debug/deps/libjsonrpc_parse-ffd0ec9347f4a70b.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-1491d7ff9462155a.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-a4f1d3839b652009.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-cbe02c8b7676a721.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-56283ed852dc2a6f.rmeta --extern sha3=/opt/rustwide/target/debug/deps/libsha3-d43b7059cc326803.rmeta --extern sled=/opt/rustwide/target/debug/deps/libsled-49348cc7426f4612.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-f380bc43a0f7ff1f.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-5a42f89a19a180e4.rmeta --cap-lints=warn --crate-version 0.0.4` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "147ebb6a57d030b0c60a88b67aa129e6aa3466726de6ac074a73b00913f17f67", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "147ebb6a57d030b0c60a88b67aa129e6aa3466726de6ac074a73b00913f17f67", kill_on_drop: false }`
[INFO] [stdout] 147ebb6a57d030b0c60a88b67aa129e6aa3466726de6ac074a73b00913f17f67