[INFO] fetching crate lockbook_core 3.3.6...
[INFO] documenting lockbook_core-3.3.6 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate lockbook_core 3.3.6 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate lockbook_core 3.3.6 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate lockbook_core 3.3.6
[INFO] finished tweaking crates.io crate lockbook_core 3.3.6
[INFO] tweaked toml for crates.io crate lockbook_core 3.3.6 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "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" "+1.46.0" "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-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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9a5a83615ebc0fee3576e6e99a8c13908aa55c2bf885177351803428297a2e32
[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" "9a5a83615ebc0fee3576e6e99a8c13908aa55c2bf885177351803428297a2e32", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9a5a83615ebc0fee3576e6e99a8c13908aa55c2bf885177351803428297a2e32", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9a5a83615ebc0fee3576e6e99a8c13908aa55c2bf885177351803428297a2e32", kill_on_drop: false }`
[INFO] [stdout] 9a5a83615ebc0fee3576e6e99a8c13908aa55c2bf885177351803428297a2e32
[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" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 392f97b8b8f4ec0f83c130bdfdd1be5530b1f4aca0036316dfb1a9b0dd9e4df6
[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" "392f97b8b8f4ec0f83c130bdfdd1be5530b1f4aca0036316dfb1a9b0dd9e4df6", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking smallvec v1.4.2
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]     Checking crossbeam-utils v0.7.2
[INFO] [stderr]     Checking universal-hash v0.3.0
[INFO] [stderr]     Checking aead v0.2.0
[INFO] [stderr]     Checking publicsuffix v1.5.4
[INFO] [stderr]     Checking openssl v0.10.30
[INFO] [stderr]     Checking uuid v0.8.1
[INFO] [stderr]    Compiling zeroize_derive v1.0.0
[INFO] [stderr]     Checking polyval v0.3.3
[INFO] [stderr]     Checking parking_lot_core v0.7.2
[INFO] [stderr]     Checking tokio-executor v0.1.10
[INFO] [stderr]     Checking crossbeam-epoch v0.8.2
[INFO] [stderr]     Checking crossbeam-queue v0.2.3
[INFO] [stderr]     Checking cookie_store v0.7.0
[INFO] [stderr]     Checking ghash v0.2.3
[INFO] [stderr]     Checking parking_lot v0.10.2
[INFO] [stderr]     Checking tokio-reactor v0.1.12
[INFO] [stderr]     Checking tokio-timer v0.2.13
[INFO] [stderr]     Checking tokio-current-thread v0.1.7
[INFO] [stderr]     Checking crossbeam-deque v0.7.3
[INFO] [stderr]     Checking sled v0.31.0
[INFO] [stderr]     Checking tokio-threadpool v0.1.18
[INFO] [stderr]     Checking num-iter v0.1.41
[INFO] [stderr]     Checking tokio-tcp v0.1.4
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stderr]     Checking zeroize v1.1.0
[INFO] [stderr]     Checking num-bigint-dig v0.6.0
[INFO] [stderr]     Checking aes-gcm v0.5.0
[INFO] [stderr]     Checking hyper v0.12.35
[INFO] [stderr]     Checking native-tls v0.2.4
[INFO] [stderr]     Checking rsa v0.2.0
[INFO] [stderr]     Checking hyper-tls v0.3.2
[INFO] [stderr]     Checking reqwest v0.9.24
[INFO] [stderr]  Documenting lockbook_core v3.3.6 (/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(try_trait)]
[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 `lockbook_core`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-type staticlib --crate-type cdylib --crate-name lockbook_core 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 aead=/opt/rustwide/target/debug/deps/libaead-049018007ae02e00.rmeta --extern aes_gcm=/opt/rustwide/target/debug/deps/libaes_gcm-271605668a1652b5.rmeta --extern base64=/opt/rustwide/target/debug/deps/libbase64-2cf622753e1ddd46.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-9de4bdcd0d606d7b.rmeta --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-584eac83de0b213d.rmeta --extern rsa=/opt/rustwide/target/debug/deps/librsa-372662c02faa75c9.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-cf2a7db764a470fc.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-00b105e50b749454.rmeta --extern sha2=/opt/rustwide/target/debug/deps/libsha2-c40449549d4fbddd.rmeta --extern sled=/opt/rustwide/target/debug/deps/libsled-a7a234c8ac78d7df.rmeta --extern tempfile=/opt/rustwide/target/debug/deps/libtempfile-acf8ecb6f63fff47.rmeta --extern uuid=/opt/rustwide/target/debug/deps/libuuid-41f4c25eff9e4603.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "392f97b8b8f4ec0f83c130bdfdd1be5530b1f4aca0036316dfb1a9b0dd9e4df6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "392f97b8b8f4ec0f83c130bdfdd1be5530b1f4aca0036316dfb1a9b0dd9e4df6", kill_on_drop: false }`
[INFO] [stdout] 392f97b8b8f4ec0f83c130bdfdd1be5530b1f4aca0036316dfb1a9b0dd9e4df6