[INFO] cloning repository https://github.com/Cerulity64X/two_mutable_refs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Cerulity64X/two_mutable_refs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCerulity64X%2Ftwo_mutable_refs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCerulity64X%2Ftwo_mutable_refs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d69ccd41fef2dd1ef0de18d32fed77d0a56d5a4a
[INFO] documenting Cerulity64X/two_mutable_refs against beta-2025-10-28 for beta-1.92-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCerulity64X%2Ftwo_mutable_refs" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Cerulity64X/two_mutable_refs
[INFO] finished tweaking git repo https://github.com/Cerulity64X/two_mutable_refs
[INFO] tweaked toml for git repo https://github.com/Cerulity64X/two_mutable_refs written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Cerulity64X/two_mutable_refs on toolchain beta-2025-10-28
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Cerulity64X/two_mutable_refs 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" "+beta-2025-10-28" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 305d1f0948b358fdf03eb4bbf6755624b40ab6c6a83562bf6ef4f8dc5cb75833
[INFO] running `Command { std: "docker" "start" "-a" "305d1f0948b358fdf03eb4bbf6755624b40ab6c6a83562bf6ef4f8dc5cb75833", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "305d1f0948b358fdf03eb4bbf6755624b40ab6c6a83562bf6ef4f8dc5cb75833", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "305d1f0948b358fdf03eb4bbf6755624b40ab6c6a83562bf6ef4f8dc5cb75833", kill_on_drop: false }`
[INFO] [stdout] 305d1f0948b358fdf03eb4bbf6755624b40ab6c6a83562bf6ef4f8dc5cb75833
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "RUSTFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e193deb5ca4fae17f5d394f966412b5a52355c739c90841269f35295802e0fd9
[INFO] running `Command { std: "docker" "start" "-a" "e193deb5ca4fae17f5d394f966412b5a52355c739c90841269f35295802e0fd9", kill_on_drop: false }`
[INFO] [stderr]  Documenting two_mutable_refs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(get_mut_unchecked)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `two_mutable_refs`
[INFO] running `Command { std: "docker" "inspect" "e193deb5ca4fae17f5d394f966412b5a52355c739c90841269f35295802e0fd9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e193deb5ca4fae17f5d394f966412b5a52355c739c90841269f35295802e0fd9", kill_on_drop: false }`
[INFO] [stdout] e193deb5ca4fae17f5d394f966412b5a52355c739c90841269f35295802e0fd9
