[INFO] fetching crate corekit 1.2.0...
[INFO] documenting corekit-1.2.0 against 1.99.0-beta.8 for beta-rustdoc-1.100
[INFO] extracting crate corekit 1.2.0 into /workspace/builds/worker-5-tc1/source
[INFO] started tweaking crates.io crate corekit 1.2.0
[INFO] finished tweaking crates.io crate corekit 1.2.0
[INFO] tweaked toml for crates.io crate corekit 1.2.0 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate corekit 1.2.0 on toolchain 1.99.0-beta.8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate corekit 1.2.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded corekit_macros v1.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:77db811e55d90add9212f6832c23229e3de5f1c1f9905e8cb07319ea15df73ac" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] bc9393e9279b2e69a9080b4e74286963e5e8eed7017101bb349a7f5085033084
[INFO] running `Command { std: "docker" "start" "bc9393e9279b2e69a9080b4e74286963e5e8eed7017101bb349a7f5085033084", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bc9393e9279b2e69a9080b4e74286963e5e8eed7017101bb349a7f5085033084", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "bc9393e9279b2e69a9080b4e74286963e5e8eed7017101bb349a7f5085033084" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bc9393e9279b2e69a9080b4e74286963e5e8eed7017101bb349a7f5085033084", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "bc9393e9279b2e69a9080b4e74286963e5e8eed7017101bb349a7f5085033084" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v3.0.5
[INFO] [stderr]    Compiling syn v2.0.119
[INFO] [stderr]    Compiling thiserror-impl v2.0.20
[INFO] [stderr]     Checking thiserror v2.0.20
[INFO] [stderr]    Compiling corekit_macros v1.2.0
[INFO] [stderr]  Documenting corekit v1.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0658]: the `!` type is experimental
[INFO] [stdout]   --> src/algebraic_types/empty.rs:21:18
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub type Empty = !;
[INFO] [stdout]    |                  ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #35121 <https://github.com/rust-lang/rust/issues/35121> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0658`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `corekit`
[INFO] running `Command { std: "docker" "inspect" "bc9393e9279b2e69a9080b4e74286963e5e8eed7017101bb349a7f5085033084", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bc9393e9279b2e69a9080b4e74286963e5e8eed7017101bb349a7f5085033084", kill_on_drop: false }`
[INFO] [stdout] bc9393e9279b2e69a9080b4e74286963e5e8eed7017101bb349a7f5085033084
