[INFO] fetching crate lockbook_core 3.3.6...
[INFO] documenting lockbook_core-3.3.6 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate lockbook_core 3.3.6 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate lockbook_core 3.3.6 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 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-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] a96e3f2ae98a70b10005e33c99d0d1a508faa9c5a28b84633b49d1df840701f6
[INFO] running `Command { std: "docker" "start" "-a" "a96e3f2ae98a70b10005e33c99d0d1a508faa9c5a28b84633b49d1df840701f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a96e3f2ae98a70b10005e33c99d0d1a508faa9c5a28b84633b49d1df840701f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a96e3f2ae98a70b10005e33c99d0d1a508faa9c5a28b84633b49d1df840701f6", kill_on_drop: false }`
[INFO] [stdout] a96e3f2ae98a70b10005e33c99d0d1a508faa9c5a28b84633b49d1df840701f6
[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] 87554fb7d18a0499db164be2c032410f0911e3f56b2f97919b3f662652ddd3cc
[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" "87554fb7d18a0499db164be2c032410f0911e3f56b2f97919b3f662652ddd3cc", kill_on_drop: false }`
[INFO] [stderr]     Checking spin v0.5.2
[INFO] [stderr]     Checking futures v0.1.30
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking hashbrown v0.9.1
[INFO] [stderr]    Compiling openssl v0.10.30
[INFO] [stderr]     Checking subtle v2.3.0
[INFO] [stderr]     Checking smallvec v1.4.2
[INFO] [stderr]    Compiling libm v0.2.1
[INFO] [stderr]     Checking regex-syntax v0.6.20
[INFO] [stderr]     Checking try-lock v0.2.3
[INFO] [stderr]    Compiling native-tls v0.2.4
[INFO] [stderr]    Compiling encoding_rs v0.8.24
[INFO] [stderr]     Checking openssl-probe v0.1.2
[INFO] [stderr]     Checking mime v0.3.16
[INFO] [stderr]     Checking base64 v0.11.0
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling indexmap v1.6.0
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling num-iter v0.1.41
[INFO] [stderr]    Compiling num-bigint-dig v0.6.0
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]    Compiling error-chain v0.12.4
[INFO] [stderr]     Checking try_from v0.3.2
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking idna v0.2.0
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking parking_lot_core v0.7.2
[INFO] [stderr]     Checking fs2 v0.4.3
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[INFO] [stderr]     Checking aead v0.2.0
[INFO] [stderr]     Checking digest v0.8.1
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[INFO] [stderr]     Checking parking_lot_core v0.6.2
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[INFO] [stderr]    Compiling zeroize_derive v1.0.1
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[INFO] [stderr]     Checking tokio-executor v0.1.10
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[INFO] [stderr]     Checking tokio-sync v0.1.8
[INFO] [stderr]     Checking tokio-buf v0.1.1
[INFO] [stderr]     Checking futures-cpupool v0.1.8
[INFO] [stderr]     Checking want v0.2.0
[INFO] [stderr]    Compiling mime_guess v2.0.3
[INFO] [stderr]     Checking tokio-current-thread v0.1.7
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[INFO] [stderr]     Checking publicsuffix v1.5.4
[INFO] [stderr]     Checking crossbeam-deque v0.7.3
[INFO] [stderr]     Checking sled v0.31.0
[INFO] [stderr]     Checking tokio-reactor v0.1.12
[INFO] [stderr]     Checking tokio-threadpool v0.1.18
[INFO] [stderr]     Checking tokio-tcp v0.1.4
[INFO] [stderr]     Checking zeroize v1.1.1
[INFO] [stderr]     Checking aes-gcm v0.5.0
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stderr]     Checking cookie_store v0.7.0
[INFO] [stderr]     Checking h2 v0.1.26
[INFO] [stderr]     Checking http-body v0.1.0
[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-e78dc06c63a55a94.rmeta --extern aes_gcm=/opt/rustwide/target/debug/deps/libaes_gcm-95d67b188d32999a.rmeta --extern base64=/opt/rustwide/target/debug/deps/libbase64-df6c862ed9a2d128.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-c85954dc41156076.rmeta --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-7127d777fd286a06.rmeta --extern rsa=/opt/rustwide/target/debug/deps/librsa-eb29394f7255e1c3.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-ce360c6747a68ca1.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-a547664976a3b244.rmeta --extern sha2=/opt/rustwide/target/debug/deps/libsha2-8325a45647c48e9b.rmeta --extern sled=/opt/rustwide/target/debug/deps/libsled-d8222cc8fd605af6.rmeta --extern tempfile=/opt/rustwide/target/debug/deps/libtempfile-5301f6fa520f8279.rmeta --extern uuid=/opt/rustwide/target/debug/deps/libuuid-dd1a5ac6c5f4249d.rmeta --cap-lints=warn --crate-version 3.3.6` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "87554fb7d18a0499db164be2c032410f0911e3f56b2f97919b3f662652ddd3cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87554fb7d18a0499db164be2c032410f0911e3f56b2f97919b3f662652ddd3cc", kill_on_drop: false }`
[INFO] [stdout] 87554fb7d18a0499db164be2c032410f0911e3f56b2f97919b3f662652ddd3cc
