[INFO] fetching crate ao_rs 0.1.5...
[INFO] documenting ao_rs-0.1.5 against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] extracting crate ao_rs 0.1.5 into /workspace/builds/worker-108/source
[INFO] validating manifest of crates.io crate ao_rs 0.1.5 on toolchain beta-2022-05-20
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ao_rs 0.1.5
[INFO] finished tweaking crates.io crate ao_rs 0.1.5
[INFO] tweaked toml for crates.io crate ao_rs 0.1.5 written to /workspace/builds/worker-108/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-108/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-108/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" "+beta-2022-05-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 550b6a60230715d6098095eb53c2b1a7796c86ca255684ea0b755119a41ea961
[INFO] running `Command { std: "docker" "start" "-a" "550b6a60230715d6098095eb53c2b1a7796c86ca255684ea0b755119a41ea961", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "550b6a60230715d6098095eb53c2b1a7796c86ca255684ea0b755119a41ea961", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "550b6a60230715d6098095eb53c2b1a7796c86ca255684ea0b755119a41ea961", kill_on_drop: false }`
[INFO] [stdout] 550b6a60230715d6098095eb53c2b1a7796c86ca255684ea0b755119a41ea961
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-108/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-108/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" "+beta-2022-05-20" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c1fbb6636a73dba2caf79f09d0ba758e786624e7f48c07569c2d35678b929973
[INFO] running `Command { std: "docker" "start" "-a" "c1fbb6636a73dba2caf79f09d0ba758e786624e7f48c07569c2d35678b929973", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]  Documenting ao_rs v0.1.5 (/opt/rustwide/workdir)
[INFO] [stderr] error: could not document `ao_rs`
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(unique)]
[INFO] [stdout]   |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] error[E0635]: unknown feature `unique`
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(unique)]
[INFO] [stdout]   |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] Caused by:
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name ao_rs src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=39c60e9df6e1655f -L dependency=/opt/rustwide/target/debug/deps --extern libc=/opt/rustwide/target/debug/deps/liblibc-4d71df194c95b93b.rmeta --cap-lints=warn --crate-version 0.1.5` (exit status: 1)
[INFO] [stdout] Some errors have detailed explanations: E0554, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "c1fbb6636a73dba2caf79f09d0ba758e786624e7f48c07569c2d35678b929973", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c1fbb6636a73dba2caf79f09d0ba758e786624e7f48c07569c2d35678b929973", kill_on_drop: false }`
[INFO] [stdout] c1fbb6636a73dba2caf79f09d0ba758e786624e7f48c07569c2d35678b929973