[INFO] fetching crate avr-std-stub 1.0.3...
[INFO] documenting avr-std-stub-1.0.3 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate avr-std-stub 1.0.3 into /workspace/builds/worker-67/source
[INFO] validating manifest of crates.io crate avr-std-stub 1.0.3 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 crates.io crate avr-std-stub 1.0.3
[INFO] finished tweaking crates.io crate avr-std-stub 1.0.3
[INFO] tweaked toml for crates.io crate avr-std-stub 1.0.3 written to /workspace/builds/worker-67/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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] 0f3cf5e8401b49ac326e5d35ee10cffa8184fb4c747ca60670a7b13287e27430
[INFO] running `Command { std: "docker" "start" "-a" "0f3cf5e8401b49ac326e5d35ee10cffa8184fb4c747ca60670a7b13287e27430", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0f3cf5e8401b49ac326e5d35ee10cffa8184fb4c747ca60670a7b13287e27430", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0f3cf5e8401b49ac326e5d35ee10cffa8184fb4c747ca60670a7b13287e27430", kill_on_drop: false }`
[INFO] [stdout] 0f3cf5e8401b49ac326e5d35ee10cffa8184fb4c747ca60670a7b13287e27430
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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] 63cb84aa73c8919ab41854c5bce2c6860fec8dea67152a8b565c4141d0413d76
[INFO] running `Command { std: "docker" "start" "-a" "63cb84aa73c8919ab41854c5bce2c6860fec8dea67152a8b565c4141d0413d76", kill_on_drop: false }`
[INFO] [stderr]  Documenting avr-std-stub v1.0.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![feature(lang_items)]
[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 `avr-std-stub`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name avr_std_stub src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=4e6ab06ea3fe26df -L dependency=/opt/rustwide/target/debug/deps --cap-lints=warn --crate-version 1.0.3` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "63cb84aa73c8919ab41854c5bce2c6860fec8dea67152a8b565c4141d0413d76", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "63cb84aa73c8919ab41854c5bce2c6860fec8dea67152a8b565c4141d0413d76", kill_on_drop: false }`
[INFO] [stdout] 63cb84aa73c8919ab41854c5bce2c6860fec8dea67152a8b565c4141d0413d76