[INFO] fetching crate pn-sign 0.1.0...
[INFO] documenting pn-sign-0.1.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate pn-sign 0.1.0 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate pn-sign 0.1.0 on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate pn-sign 0.1.0
[INFO] finished tweaking crates.io crate pn-sign 0.1.0
[INFO] tweaked toml for crates.io crate pn-sign 0.1.0 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate crates.io crate pn-sign 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded git2 v0.13.6
[INFO] [stderr]   Downloaded libgit2-sys v0.12.7+1.0.0
[INFO] [stderr]   Downloaded cargo-lock v4.0.1
[INFO] [stderr]   Downloaded built v0.4.2
[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" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 08f5dbe8dcb6657887b0fb3c9d16468b9b0b66b3821378c15fa48556b8cf32ad
[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" "08f5dbe8dcb6657887b0fb3c9d16468b9b0b66b3821378c15fa48556b8cf32ad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "08f5dbe8dcb6657887b0fb3c9d16468b9b0b66b3821378c15fa48556b8cf32ad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "08f5dbe8dcb6657887b0fb3c9d16468b9b0b66b3821378c15fa48556b8cf32ad", kill_on_drop: false }`
[INFO] [stdout] 08f5dbe8dcb6657887b0fb3c9d16468b9b0b66b3821378c15fa48556b8cf32ad
[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" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 04b1e4663e9aebfc0c7714b0390bbb425ebf42c7ac6dacf00d40876c30ed8ca0
[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" "04b1e4663e9aebfc0c7714b0390bbb425ebf42c7ac6dacf00d40876c30ed8ca0", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.72
[INFO] [stderr]    Compiling syn v1.0.34
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling matches v0.1.8
[INFO] [stderr]    Compiling serde v1.0.114
[INFO] [stderr]    Compiling tinyvec v0.3.3
[INFO] [stderr]    Compiling percent-encoding v2.1.0
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]     Checking headers-core v0.2.0
[INFO] [stderr]     Checking sha-1 v0.8.2
[INFO] [stderr]    Compiling unicode-bidi v0.3.4
[INFO] [stderr]    Compiling unicode-normalization v0.1.13
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling idna v0.2.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking clap v2.33.1
[INFO] [stderr]    Compiling jobserver v0.1.21
[INFO] [stderr]    Compiling url v2.1.1
[INFO] [stderr]    Compiling cc v1.0.58
[INFO] [stderr]     Checking headers v0.3.2
[INFO] [stderr]     Checking chrono v0.4.13
[INFO] [stderr]     Checking pretty_env_logger v0.4.0
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling libgit2-sys v0.12.7+1.0.0
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling git2 v0.13.6
[INFO] [stderr]    Compiling serde_derive v1.0.114
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.3
[INFO] [stderr]    Compiling thiserror-impl v1.0.20
[INFO] [stderr]    Compiling proc-macro-error v1.0.3
[INFO] [stderr]    Compiling structopt-derive v0.4.8
[INFO] [stderr]     Checking thiserror v1.0.20
[INFO] [stderr]     Checking structopt v0.3.15
[INFO] [stderr]    Compiling toml v0.5.6
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling cargo-lock v4.0.1
[INFO] [stderr]    Compiling built v0.4.2
[INFO] [stderr]    Compiling pn-sign v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting pn-sign v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(backtrace)]
[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 `pn-sign`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name pn_sign src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="log-level-info"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern anyhow=/opt/rustwide/target/debug/deps/libanyhow-70b362b0d3f6c020.rmeta --extern base64=/opt/rustwide/target/debug/deps/libbase64-e0678ab4998e9df0.rmeta --extern bytes=/opt/rustwide/target/debug/deps/libbytes-c5714e68d7e46dbf.rmeta --extern chrono=/opt/rustwide/target/debug/deps/libchrono-7f8b1bb6e19a78c3.rmeta --extern headers=/opt/rustwide/target/debug/deps/libheaders-3118296b75695c12.rmeta --extern hmac=/opt/rustwide/target/debug/deps/libhmac-9533bd7934e3f6b0.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-93d4a0c8dc98e851.rmeta --extern percent_encoding=/opt/rustwide/target/debug/deps/libpercent_encoding-ade4f36e8e12afd7.rmeta --extern pretty_env_logger=/opt/rustwide/target/debug/deps/libpretty_env_logger-c6eb84aa358f87a5.rmeta --extern sha2=/opt/rustwide/target/debug/deps/libsha2-124f8acc46cd58ae.rmeta --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-1641eb2af575cfbf.rmeta --extern thiserror=/opt/rustwide/target/debug/deps/libthiserror-1a228d9f92e63378.rmeta --extern url=/opt/rustwide/target/debug/deps/liburl-ce802e45ec40a9b5.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "04b1e4663e9aebfc0c7714b0390bbb425ebf42c7ac6dacf00d40876c30ed8ca0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "04b1e4663e9aebfc0c7714b0390bbb425ebf42c7ac6dacf00d40876c30ed8ca0", kill_on_drop: false }`
[INFO] [stdout] 04b1e4663e9aebfc0c7714b0390bbb425ebf42c7ac6dacf00d40876c30ed8ca0