[INFO] cloning repository https://github.com/ammoniak/sam3x8e
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ammoniak/sam3x8e" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fammoniak%2Fsam3x8e", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fammoniak%2Fsam3x8e'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 98daa87233a2135b77dcd1457deeecb998a3f470
[INFO] documenting ammoniak/sam3x8e against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fammoniak%2Fsam3x8e" "/workspace/builds/worker-23/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-23/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ammoniak/sam3x8e 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] removed /workspace/builds/worker-23/source/.cargo/config
[INFO] started tweaking git repo https://github.com/ammoniak/sam3x8e
[INFO] finished tweaking git repo https://github.com/ammoniak/sam3x8e
[INFO] tweaked toml for git repo https://github.com/ammoniak/sam3x8e written to /workspace/builds/worker-23/source/Cargo.toml
[INFO] crate git repo https://github.com/ammoniak/sam3x8e already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: package.bench
[INFO] [stderr] warning: unused manifest key: package.test
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/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] dd9205fd073eded1ec8b3d534a759dcb4173d80bb9e20e6abc2652d182173480
[INFO] running `Command { std: "docker" "start" "-a" "dd9205fd073eded1ec8b3d534a759dcb4173d80bb9e20e6abc2652d182173480", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dd9205fd073eded1ec8b3d534a759dcb4173d80bb9e20e6abc2652d182173480", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dd9205fd073eded1ec8b3d534a759dcb4173d80bb9e20e6abc2652d182173480", kill_on_drop: false }`
[INFO] [stdout] dd9205fd073eded1ec8b3d534a759dcb4173d80bb9e20e6abc2652d182173480
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/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] ae2a4cd605c042ab13b9eb3bd88a726ec3aaafbcb22e9f1e12f57b2020befdd0
[INFO] running `Command { std: "docker" "start" "-a" "ae2a4cd605c042ab13b9eb3bd88a726ec3aaafbcb22e9f1e12f57b2020befdd0", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: package.bench
[INFO] [stderr] warning: unused manifest key: package.test
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling cortex-m v0.5.8
[INFO] [stderr]     Checking vcell v0.1.0
[INFO] [stderr]     Checking aligned v0.2.0
[INFO] [stderr]    Compiling sam3x8e v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking volatile-register v0.2.0
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling bare-metal v0.2.4
[INFO] [stderr]  Documenting sam3x8e v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(untagged_unions)]
[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 `sam3x8e`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name sam3x8e src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=1fbd839198516579 -L dependency=/opt/rustwide/target/debug/deps --extern bare_metal=/opt/rustwide/target/debug/deps/libbare_metal-3bb3641e788ddf81.rmeta --extern cortex_m=/opt/rustwide/target/debug/deps/libcortex_m-a07636d0ae7f6293.rmeta --extern vcell=/opt/rustwide/target/debug/deps/libvcell-e1a4be04b1d40b22.rmeta --cap-lints=warn --crate-version 0.1.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "ae2a4cd605c042ab13b9eb3bd88a726ec3aaafbcb22e9f1e12f57b2020befdd0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ae2a4cd605c042ab13b9eb3bd88a726ec3aaafbcb22e9f1e12f57b2020befdd0", kill_on_drop: false }`
[INFO] [stdout] ae2a4cd605c042ab13b9eb3bd88a726ec3aaafbcb22e9f1e12f57b2020befdd0