[INFO] fetching crate system_rust 0.2.16...
[INFO] testing system_rust-0.2.16 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate system_rust 0.2.16 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate system_rust 0.2.16
[INFO] finished tweaking crates.io crate system_rust 0.2.16
[INFO] tweaked toml for crates.io crate system_rust 0.2.16 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate system_rust 0.2.16 on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate system_rust 0.2.16 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-2025-09-21" "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-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f634599b65afb0d27cb6f625b4eeeabfdb4528a41189a1887329e87018e97cf4
[INFO] running `Command { std: "docker" "start" "-a" "f634599b65afb0d27cb6f625b4eeeabfdb4528a41189a1887329e87018e97cf4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f634599b65afb0d27cb6f625b4eeeabfdb4528a41189a1887329e87018e97cf4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f634599b65afb0d27cb6f625b4eeeabfdb4528a41189a1887329e87018e97cf4", kill_on_drop: false }`
[INFO] [stdout] f634599b65afb0d27cb6f625b4eeeabfdb4528a41189a1887329e87018e97cf4
[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-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2b4e9d0b2d3709fabea2056af633cd170d3e8f70df8581ab72484990314d9d52
[INFO] running `Command { std: "docker" "start" "-a" "2b4e9d0b2d3709fabea2056af633cd170d3e8f70df8581ab72484990314d9d52", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.174
[INFO] [stderr]    Compiling zerocopy v0.8.26
[INFO] [stderr]    Compiling iana-time-zone v0.1.63
[INFO] [stderr]    Compiling aho-corasick v1.1.3
[INFO] [stderr]    Compiling itertools v0.14.0
[INFO] [stderr]    Compiling chrono v0.4.41
[INFO] [stderr]    Compiling getrandom v0.3.3
[INFO] [stderr]    Compiling regex-automata v0.4.9
[INFO] [stderr]    Compiling rand_core v0.9.3
[INFO] [stderr]    Compiling ppv-lite86 v0.2.21
[INFO] [stderr]    Compiling rand_chacha v0.9.0
[INFO] [stderr]    Compiling rand v0.9.2
[INFO] [stderr]    Compiling regex v1.11.1
[INFO] [stderr]    Compiling system_rust v0.2.16 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_as_array)]
[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 compile `system_rust` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "2b4e9d0b2d3709fabea2056af633cd170d3e8f70df8581ab72484990314d9d52", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b4e9d0b2d3709fabea2056af633cd170d3e8f70df8581ab72484990314d9d52", kill_on_drop: false }`
[INFO] [stdout] 2b4e9d0b2d3709fabea2056af633cd170d3e8f70df8581ab72484990314d9d52