[INFO] fetching crate jsonwebkey 0.2.0...
[INFO] documenting jsonwebkey-0.2.0 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate jsonwebkey 0.2.0 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate jsonwebkey 0.2.0 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 jsonwebkey 0.2.0
[INFO] finished tweaking crates.io crate jsonwebkey 0.2.0
[INFO] tweaked toml for crates.io crate jsonwebkey 0.2.0 written to /workspace/builds/worker-8/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-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] 44e4aeed754542d6f822af0a05ce5f297cacdac6a38fae090db5872236a49c8b
[INFO] running `Command { std: "docker" "start" "-a" "44e4aeed754542d6f822af0a05ce5f297cacdac6a38fae090db5872236a49c8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "44e4aeed754542d6f822af0a05ce5f297cacdac6a38fae090db5872236a49c8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "44e4aeed754542d6f822af0a05ce5f297cacdac6a38fae090db5872236a49c8b", kill_on_drop: false }`
[INFO] [stdout] 44e4aeed754542d6f822af0a05ce5f297cacdac6a38fae090db5872236a49c8b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] bf82621d57edcc5f316e73189cae6d54c006a480548d6b28b329a4fc8806f094
[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" "bf82621d57edcc5f316e73189cae6d54c006a480548d6b28b329a4fc8806f094", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.45
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]    Compiling thiserror-impl v1.0.21
[INFO] [stderr]    Compiling zeroize_derive v1.0.1
[INFO] [stderr]    Compiling derive_more v0.99.11
[INFO] [stderr]     Checking zeroize v1.1.1
[INFO] [stderr]     Checking thiserror v1.0.21
[INFO] [stderr]     Checking serde v1.0.117
[INFO] [stderr]     Checking serde_json v1.0.59
[INFO] [stderr]  Documenting jsonwebkey v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(box_syntax, const_generics, fixed_size_array)]
[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 `jsonwebkey`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name jsonwebkey 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 base64=/opt/rustwide/target/debug/deps/libbase64-897b405df49641ae.rmeta --extern bitflags=/opt/rustwide/target/debug/deps/libbitflags-bb6ec8f28ecded21.rmeta --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-2ae9266d8cbba6fd.so --extern serde=/opt/rustwide/target/debug/deps/libserde-949c2808a859ef09.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-711294df20c01cf2.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-ec963d9a1ab6656b.rmeta --extern thiserror=/opt/rustwide/target/debug/deps/libthiserror-dd27a7db0703ee78.rmeta --extern zeroize=/opt/rustwide/target/debug/deps/libzeroize-1f0b4f4a060a8d7b.rmeta --cap-lints=warn --crate-version 0.2.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "bf82621d57edcc5f316e73189cae6d54c006a480548d6b28b329a4fc8806f094", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bf82621d57edcc5f316e73189cae6d54c006a480548d6b28b329a4fc8806f094", kill_on_drop: false }`
[INFO] [stdout] bf82621d57edcc5f316e73189cae6d54c006a480548d6b28b329a4fc8806f094
