[INFO] cloning repository https://github.com/placefortea/teatree
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/placefortea/teatree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fplacefortea%2Fteatree", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fplacefortea%2Fteatree'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7a56755a428fe63ee753df67a7c71d8f668e17ec
[INFO] documenting placefortea/teatree against 1.54.0 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fplacefortea%2Fteatree" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/placefortea/teatree 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 git repo https://github.com/placefortea/teatree
[INFO] finished tweaking git repo https://github.com/placefortea/teatree
[INFO] tweaked toml for git repo https://github.com/placefortea/teatree written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/placefortea/teatree already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] 080f060fe359a6146cc42575dd0cc494e7ea5e23dd6169e936669eaa742a444b
[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" "080f060fe359a6146cc42575dd0cc494e7ea5e23dd6169e936669eaa742a444b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "080f060fe359a6146cc42575dd0cc494e7ea5e23dd6169e936669eaa742a444b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "080f060fe359a6146cc42575dd0cc494e7ea5e23dd6169e936669eaa742a444b", kill_on_drop: false }`
[INFO] [stdout] 080f060fe359a6146cc42575dd0cc494e7ea5e23dd6169e936669eaa742a444b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] 9acb17ee050be191279304f1c8cbff5648ee6b0f4f98d8b78bfb9a696e5864d5
[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" "9acb17ee050be191279304f1c8cbff5648ee6b0f4f98d8b78bfb9a696e5864d5", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.29
[INFO] [stderr]    Compiling syn v0.15.33
[INFO] [stderr]    Compiling cc v1.0.36
[INFO] [stderr]    Compiling subtle v2.1.0
[INFO] [stderr]    Compiling bitflags v1.0.5
[INFO] [stderr]     Checking either v1.5.2
[INFO] [stderr]     Checking historian v4.0.3
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking crossbeam-utils v0.2.2
[INFO] [stderr]    Compiling bincode v1.1.3
[INFO] [stderr]     Checking tokio-sync v0.1.5
[INFO] [stderr]    Compiling byteorder v1.3.1
[INFO] [stderr]     Checking crossbeam-channel v0.3.8
[INFO] [stderr]    Compiling typenum v1.10.0
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking num_cpus v1.10.0
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking socket2 v0.3.8
[INFO] [stderr]     Checking hostname v0.1.5
[INFO] [stderr]     Checking fs2 v0.4.3
[INFO] [stderr]     Checking dirs v1.0.5
[INFO] [stderr]     Checking fxhash v0.2.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_chacha v0.1.1
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking crossbeam-epoch v0.3.1
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking resolv-conf v0.6.2
[INFO] [stderr]     Checking threadpool v1.7.1
[INFO] [stderr]     Checking mio v0.6.16
[INFO] [stderr]     Checking sha3 v0.7.3
[INFO] [stderr]     Checking sha2 v0.8.0
[INFO] [stderr]     Checking crossbeam-deque v0.2.0
[INFO] [stderr]    Compiling generic-array v0.12.0
[INFO] [stderr]     Checking tokio-io v0.1.12
[INFO] [stderr]     Checking http v0.1.17
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]    Compiling clear_on_drop v0.2.3
[INFO] [stderr]     Checking rayon-core v1.4.1
[INFO] [stderr]    Compiling digest v0.8.0
[INFO] [stderr]     Checking rayon v1.0.3
[INFO] [stderr]     Checking tokio-codec v0.1.1
[INFO] [stderr]     Checking parking_lot_core v0.4.0
[INFO] [stderr]     Checking tokio-threadpool v0.1.14
[INFO] [stderr]    Compiling quote v0.6.12
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]    Compiling curve25519-dalek v1.1.3
[INFO] [stderr]     Checking parking_lot v0.7.1
[INFO] [stderr]     Checking tokio-fs v0.1.6
[INFO] [stderr]     Checking backtrace v0.3.15
[INFO] [stderr]     Checking tokio-reactor v0.1.9
[INFO] [stderr]     Checking tokio-tcp v0.1.3
[INFO] [stderr]     Checking tokio-udp v0.1.3
[INFO] [stderr]     Checking tokio-uds v0.2.5
[INFO] [stderr]     Checking tokio v0.1.19
[INFO] [stderr]    Compiling synstructure v0.10.1
[INFO] [stderr]    Compiling serde_derive v1.0.90
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling derive_more v0.14.0
[INFO] [stderr]    Compiling enum-as-inner v0.2.1
[INFO] [stderr]    Compiling actix_derive v0.4.0
[INFO] [stderr]     Checking failure v0.1.5
[INFO] [stderr]     Checking trust-dns-proto v0.7.3
[INFO] [stderr]     Checking actix-threadpool v0.1.0
[INFO] [stderr]     Checking actix-rt v0.2.2
[INFO] [stderr]     Checking trust-dns-resolver v0.11.0
[INFO] [stderr]     Checking actix v0.8.1
[INFO] [stderr]     Checking serde v1.0.90
[INFO] [stderr]     Checking hashbrown v0.3.0
[INFO] [stderr]     Checking serde_bytes v0.11.1
[INFO] [stderr]     Checking serde_json v1.0.39
[INFO] [stderr]     Checking toml v0.5.0
[INFO] [stderr]     Checking ed25519-dalek v1.0.0-pre.1
[INFO] [stderr]     Checking pagecache v0.17.0
[INFO] [stderr]     Checking jsonrpc-parse v0.1.2
[INFO] [stderr]     Checking sled v0.24.1
[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-1995eac59e170bd8.rmeta --extern actix_derive=/opt/rustwide/target/debug/deps/libactix_derive-4b3d791d4a617656.so --extern bincode=/opt/rustwide/target/debug/deps/libbincode-fa9c0c509b58b21c.rmeta --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-6d7d2e976eba6e57.rmeta --extern bytes=/opt/rustwide/target/debug/deps/libbytes-e297346a8fe4c493.rmeta --extern dirs=/opt/rustwide/target/debug/deps/libdirs-2181e85a8a2d1304.rmeta --extern ed25519_dalek=/opt/rustwide/target/debug/deps/libed25519_dalek-4f1ef34abbdf09e4.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-c8b537e334739a39.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-eda077e2ad4c5ae6.rmeta --extern jsonrpc_parse=/opt/rustwide/target/debug/deps/libjsonrpc_parse-fb183b334e6b969a.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-ffbcec6a4d5e31f6.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-b1e71c670a1d77f4.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-2739194d89163c2d.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-4245b0cd3f7e90c2.rmeta --extern sha3=/opt/rustwide/target/debug/deps/libsha3-99eb30a2e965943f.rmeta --extern sled=/opt/rustwide/target/debug/deps/libsled-c2a0d9883ecd720a.rmeta --extern time=/opt/rustwide/target/debug/deps/libtime-70629a7a84dd4829.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-80e79032d4ca904e.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-31563954b79d6977.rmeta --cap-lints=warn --crate-version 0.0.4` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "9acb17ee050be191279304f1c8cbff5648ee6b0f4f98d8b78bfb9a696e5864d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9acb17ee050be191279304f1c8cbff5648ee6b0f4f98d8b78bfb9a696e5864d5", kill_on_drop: false }`
[INFO] [stdout] 9acb17ee050be191279304f1c8cbff5648ee6b0f4f98d8b78bfb9a696e5864d5
