[INFO] fetching crate polyhal 0.4.0...
[INFO] testing polyhal-0.4.0 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate polyhal 0.4.0 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate polyhal 0.4.0
[INFO] finished tweaking crates.io crate polyhal 0.4.0
[INFO] tweaked toml for crates.io crate polyhal 0.4.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate polyhal 0.4.0 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 polyhal 0.4.0 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-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] aad1b3d2e7e0539513c45f6117b09acd2a68dcb1f2295ac731e120a3d81a16c2
[INFO] running `Command { std: "docker" "start" "-a" "aad1b3d2e7e0539513c45f6117b09acd2a68dcb1f2295ac731e120a3d81a16c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aad1b3d2e7e0539513c45f6117b09acd2a68dcb1f2295ac731e120a3d81a16c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aad1b3d2e7e0539513c45f6117b09acd2a68dcb1f2295ac731e120a3d81a16c2", kill_on_drop: false }`
[INFO] [stdout] aad1b3d2e7e0539513c45f6117b09acd2a68dcb1f2295ac731e120a3d81a16c2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 91c04469217d696431c9d4c34fca6ae396734f3e9ff391e86d19fb4335f465fa
[INFO] running `Command { std: "docker" "start" "-a" "91c04469217d696431c9d4c34fca6ae396734f3e9ff391e86d19fb4335f465fa", kill_on_drop: false }`
[INFO] [stderr]    Compiling bitflags v2.9.0
[INFO] [stderr]    Compiling rustversion v1.0.20
[INFO] [stderr]    Compiling proc-macro2 v1.0.94
[INFO] [stderr]    Compiling hashbrown v0.15.3
[INFO] [stderr]    Compiling paste v1.0.15
[INFO] [stderr]    Compiling lock_api v0.4.12
[INFO] [stderr]    Compiling winnow v0.7.9
[INFO] [stderr]    Compiling toml_datetime v0.6.9
[INFO] [stderr]    Compiling polyhal v0.4.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling log v0.4.26
[INFO] [stderr]    Compiling bit v0.1.1
[INFO] [stderr]    Compiling raw-cpuid v11.5.0
[INFO] [stderr]    Compiling acpi v5.2.0
[INFO] [stderr]    Compiling spin v0.10.0
[INFO] [stderr]    Compiling arrayvec v0.7.6
[INFO] [stderr]    Compiling indexmap v2.9.0
[INFO] [stderr]    Compiling multiboot v0.8.0
[INFO] [stderr]    Compiling fdt-parser v0.4.10
[INFO] [stderr]    Compiling x86_64 v0.15.2
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]    Compiling uart_16550 v0.3.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/x86_64-0.15.2/src/lib.rs:5:44
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![cfg_attr(feature = "abi_x86_interrupt", feature(abi_x86_interrupt))]
[INFO] [stdout]   |                                            ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/x86_64-0.15.2/src/lib.rs:6:37
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![cfg_attr(feature = "step_trait", feature(step_trait))]
[INFO] [stdout]   |                                     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling syn v2.0.100
[INFO] [stderr]    Compiling lazyinit v0.2.1
[INFO] [stderr]    Compiling toml_edit v0.22.26
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `x86_64` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "91c04469217d696431c9d4c34fca6ae396734f3e9ff391e86d19fb4335f465fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "91c04469217d696431c9d4c34fca6ae396734f3e9ff391e86d19fb4335f465fa", kill_on_drop: false }`
[INFO] [stdout] 91c04469217d696431c9d4c34fca6ae396734f3e9ff391e86d19fb4335f465fa