[INFO] cloning repository https://github.com/shiro/jack-nerd-mixer
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/shiro/jack-nerd-mixer" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshiro%2Fjack-nerd-mixer", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshiro%2Fjack-nerd-mixer'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 55de58eae4af735703e7d84f35befc0167a30eeb
[INFO] documenting shiro/jack-nerd-mixer against 1.47.0 for beta-1.48-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshiro%2Fjack-nerd-mixer" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/shiro/jack-nerd-mixer 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 git repo https://github.com/shiro/jack-nerd-mixer
[INFO] finished tweaking git repo https://github.com/shiro/jack-nerd-mixer
[INFO] tweaked toml for git repo https://github.com/shiro/jack-nerd-mixer written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/shiro/jack-nerd-mixer already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded dbus v0.8.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] [stdout] 8b192be9e322bb1cd9b342461563fc2d1f5623b55df3e1a7d5246b49dd3e89d1
[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" "8b192be9e322bb1cd9b342461563fc2d1f5623b55df3e1a7d5246b49dd3e89d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8b192be9e322bb1cd9b342461563fc2d1f5623b55df3e1a7d5246b49dd3e89d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b192be9e322bb1cd9b342461563fc2d1f5623b55df3e1a7d5246b49dd3e89d1", kill_on_drop: false }`
[INFO] [stdout] 8b192be9e322bb1cd9b342461563fc2d1f5623b55df3e1a7d5246b49dd3e89d1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] 27320a778cbd1bc64018c5dfce0b77f624568d7fd834afdb77f9004e2c6bc542
[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" "27320a778cbd1bc64018c5dfce0b77f624568d7fd834afdb77f9004e2c6bc542", kill_on_drop: false }`
[INFO] [stderr]     Checking jack-sys v0.2.0 (https://github.com/RustAudio/rust-jack.git#95a3b192)
[INFO] [stderr]     Checking dbus v0.8.2
[INFO] [stderr]    Compiling clap_derive v3.0.0-beta.1 (https://github.com/clap-rs/clap/#37889c66)
[INFO] [stderr]     Checking jack v0.6.2 (https://github.com/RustAudio/rust-jack.git#95a3b192)
[INFO] [stderr]     Checking clap v3.0.0-beta.1 (https://github.com/clap-rs/clap/#37889c66)
[INFO] [stderr]  Documenting jack-nerd-mixer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(type_ascription)]
[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 `jack-nerd-mixer`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name jack_nerd_mixer src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern clap=/opt/rustwide/target/debug/deps/libclap-66dc61b6ecb4194d.rmeta --extern dbus=/opt/rustwide/target/debug/deps/libdbus-75f9f5642ca27185.rmeta --extern jack=/opt/rustwide/target/debug/deps/libjack-324e40f1c99d28d6.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "27320a778cbd1bc64018c5dfce0b77f624568d7fd834afdb77f9004e2c6bc542", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "27320a778cbd1bc64018c5dfce0b77f624568d7fd834afdb77f9004e2c6bc542", kill_on_drop: false }`
[INFO] [stdout] 27320a778cbd1bc64018c5dfce0b77f624568d7fd834afdb77f9004e2c6bc542
