[INFO] fetching crate pn-sign 0.1.0...
[INFO] documenting pn-sign-0.1.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate pn-sign 0.1.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate pn-sign 0.1.0 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 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-0/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" "+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-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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6d4c6683016d3202e64751f4608031a83cca93bbd8e382137d16ef6c4c8e49e7
[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" "6d4c6683016d3202e64751f4608031a83cca93bbd8e382137d16ef6c4c8e49e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6d4c6683016d3202e64751f4608031a83cca93bbd8e382137d16ef6c4c8e49e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d4c6683016d3202e64751f4608031a83cca93bbd8e382137d16ef6c4c8e49e7", kill_on_drop: false }`
[INFO] [stdout] 6d4c6683016d3202e64751f4608031a83cca93bbd8e382137d16ef6c4c8e49e7
[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" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cf562dbd8851db55a6fd2855c36d1ec4fbbde5c152a1193927b118375529dc0f
[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" "cf562dbd8851db55a6fd2855c36d1ec4fbbde5c152a1193927b118375529dc0f", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.34
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling tinyvec v0.3.3
[INFO] [stderr]    Compiling serde v1.0.114
[INFO] [stderr]    Compiling percent-encoding v2.1.0
[INFO] [stderr]    Compiling jobserver v0.1.21
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling time v0.1.43
[INFO] [stderr]     Checking sha-1 v0.8.2
[INFO] [stderr]     Checking sha2 v0.8.2
[INFO] [stderr]     Checking chrono v0.4.13
[INFO] [stderr]     Checking headers v0.3.2
[INFO] [stderr]    Compiling cc v1.0.58
[INFO] [stderr]    Compiling unicode-normalization v0.1.13
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]    Compiling num-integer v0.1.43
[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 idna v0.2.0
[INFO] [stderr]    Compiling url v2.1.1
[INFO] [stderr]    Compiling git2 v0.13.6
[INFO] [stderr]    Compiling syn-mid v0.5.0
[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 stable 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-8c061b3ea71c2288.rmeta --extern base64=/opt/rustwide/target/debug/deps/libbase64-2cf622753e1ddd46.rmeta --extern bytes=/opt/rustwide/target/debug/deps/libbytes-e39cb00dc7b3284b.rmeta --extern chrono=/opt/rustwide/target/debug/deps/libchrono-d2e81d3a47154355.rmeta --extern headers=/opt/rustwide/target/debug/deps/libheaders-ed176ddfad07d53d.rmeta --extern hmac=/opt/rustwide/target/debug/deps/libhmac-f5b0123a4af903e0.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-07cca7575b6eba10.rmeta --extern percent_encoding=/opt/rustwide/target/debug/deps/libpercent_encoding-4c7d35c073f4d6c2.rmeta --extern pretty_env_logger=/opt/rustwide/target/debug/deps/libpretty_env_logger-2563e48048958933.rmeta --extern sha2=/opt/rustwide/target/debug/deps/libsha2-cf9e4e0b82f479ca.rmeta --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-74c31c6eaaaf932d.rmeta --extern thiserror=/opt/rustwide/target/debug/deps/libthiserror-4b313ebcfd9c6fd6.rmeta --extern url=/opt/rustwide/target/debug/deps/liburl-f08e687af456fe47.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "cf562dbd8851db55a6fd2855c36d1ec4fbbde5c152a1193927b118375529dc0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cf562dbd8851db55a6fd2855c36d1ec4fbbde5c152a1193927b118375529dc0f", kill_on_drop: false }`
[INFO] [stdout] cf562dbd8851db55a6fd2855c36d1ec4fbbde5c152a1193927b118375529dc0f