[INFO] cloning repository https://github.com/vi/audiorepeat
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vi/audiorepeat" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvi%2Faudiorepeat", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvi%2Faudiorepeat'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1563a7c673236223cdeb5259914f1e2a2329128e
[INFO] documenting vi/audiorepeat against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvi%2Faudiorepeat" "/workspace/builds/worker-34/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-34/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/vi/audiorepeat on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/vi/audiorepeat
[INFO] finished tweaking git repo https://github.com/vi/audiorepeat
[INFO] tweaked toml for git repo https://github.com/vi/audiorepeat written to /workspace/builds/worker-34/source/Cargo.toml
[INFO] crate git repo https://github.com/vi/audiorepeat already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--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 anyhow v1.0.28
[INFO] [stderr]   Downloaded cc v1.0.52
[INFO] [stderr]   Downloaded alsa-sys v0.3.0
[INFO] [stderr]   Downloaded libc v0.2.69
[INFO] [stderr]   Downloaded alsa v0.4.2
[INFO] [stderr]   Downloaded syn v1.0.18
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6ccfa018dbc588669ade5627dafd7fb69b97918f20663fc66419fcfbe1a6ad99
[INFO] running `Command { std: "docker" "start" "-a" "6ccfa018dbc588669ade5627dafd7fb69b97918f20663fc66419fcfbe1a6ad99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6ccfa018dbc588669ade5627dafd7fb69b97918f20663fc66419fcfbe1a6ad99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ccfa018dbc588669ade5627dafd7fb69b97918f20663fc66419fcfbe1a6ad99", kill_on_drop: false }`
[INFO] [stdout] 6ccfa018dbc588669ade5627dafd7fb69b97918f20663fc66419fcfbe1a6ad99
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3f89a7aeabf272e45b4b5183197f28f841f2f61d31d2846543deb9148b8f7744
[INFO] running `Command { std: "docker" "start" "-a" "3f89a7aeabf272e45b4b5183197f28f841f2f61d31d2846543deb9148b8f7744", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.10
[INFO] [stderr]    Compiling libc v0.2.69
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling pkg-config v0.3.17
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling syn v1.0.18
[INFO] [stderr]    Compiling nix v0.15.0
[INFO] [stderr]    Compiling anyhow v1.0.28
[INFO] [stderr]    Compiling argh_shared v0.1.1
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling alsa-sys v0.3.0
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]     Checking alsa v0.4.2
[INFO] [stderr]     Checking crossbeam-channel v0.4.2
[INFO] [stderr]    Compiling argh_derive v0.1.1
[INFO] [stderr]     Checking argh v0.1.3
[INFO] [stderr]  Documenting audiorepeat 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:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(saturating_neg)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `audiorepeat`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name audiorepeat src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=227966d1a5937444 -L dependency=/opt/rustwide/target/debug/deps --extern alsa=/opt/rustwide/target/debug/deps/libalsa-1eb8a2acb46b1cd2.rmeta --extern anyhow=/opt/rustwide/target/debug/deps/libanyhow-09089784b620a08d.rmeta --extern argh=/opt/rustwide/target/debug/deps/libargh-f170254b69b594d7.rmeta --extern crossbeam_channel=/opt/rustwide/target/debug/deps/libcrossbeam_channel-ef19c6f2928ad45f.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "3f89a7aeabf272e45b4b5183197f28f841f2f61d31d2846543deb9148b8f7744", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f89a7aeabf272e45b4b5183197f28f841f2f61d31d2846543deb9148b8f7744", kill_on_drop: false }`
[INFO] [stdout] 3f89a7aeabf272e45b4b5183197f28f841f2f61d31d2846543deb9148b8f7744