[INFO] fetching crate unkai 0.2.0...
[INFO] testing unkai-0.2.0 against beta-2025-10-28 for beta-1.92-2
[INFO] extracting crate unkai 0.2.0 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate unkai 0.2.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate unkai 0.2.0
[INFO] tweaked toml for crates.io crate unkai 0.2.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate unkai 0.2.0 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 crates.io crate unkai 0.2.0 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" "+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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0752adc374aeccf9a12a33496ed7366eadbac1c8b8f9373cbd58305a24786774
[INFO] running `Command { std: "docker" "start" "-a" "0752adc374aeccf9a12a33496ed7366eadbac1c8b8f9373cbd58305a24786774", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0752adc374aeccf9a12a33496ed7366eadbac1c8b8f9373cbd58305a24786774", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0752adc374aeccf9a12a33496ed7366eadbac1c8b8f9373cbd58305a24786774", kill_on_drop: false }`
[INFO] [stdout] 0752adc374aeccf9a12a33496ed7366eadbac1c8b8f9373cbd58305a24786774
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e2d5c427a9946100677ed5b6c640d38e09fb7b169f8a1b6a5d2fb6cd17ee83d8
[INFO] running `Command { std: "docker" "start" "-a" "e2d5c427a9946100677ed5b6c640d38e09fb7b169f8a1b6a5d2fb6cd17ee83d8", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.158
[INFO] [stderr]    Compiling autocfg v1.3.0
[INFO] [stderr]    Compiling adler v1.0.2
[INFO] [stderr]    Compiling memchr v2.7.4
[INFO] [stderr]    Compiling gimli v0.29.0
[INFO] [stderr]    Compiling cc v1.1.15
[INFO] [stderr]    Compiling smallvec v1.13.2
[INFO] [stderr]    Compiling rustc-demangle v0.1.24
[INFO] [stderr]    Compiling miniz_oxide v0.7.4
[INFO] [stderr]    Compiling hashbrown v0.14.5
[INFO] [stderr]    Compiling lock_api v0.4.12
[INFO] [stderr]    Compiling once_cell v1.19.0
[INFO] [stderr]    Compiling object v0.36.4
[INFO] [stderr]    Compiling parking_lot_core v0.9.10
[INFO] [stderr]    Compiling dashmap v5.5.3
[INFO] [stderr]    Compiling backtrace v0.3.73
[INFO] [stderr]    Compiling addr2line v0.22.0
[INFO] [stderr]    Compiling unkai v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:51:1
[INFO] [stdout]    |
[INFO] [stdout] 51 | #![feature(allocator_api)]
[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 `unkai` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "e2d5c427a9946100677ed5b6c640d38e09fb7b169f8a1b6a5d2fb6cd17ee83d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e2d5c427a9946100677ed5b6c640d38e09fb7b169f8a1b6a5d2fb6cd17ee83d8", kill_on_drop: false }`
[INFO] [stdout] e2d5c427a9946100677ed5b6c640d38e09fb7b169f8a1b6a5d2fb6cd17ee83d8