[INFO] fetching crate ecfft 0.1.0...
[INFO] testing ecfft-0.1.0 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate ecfft 0.1.0 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate ecfft 0.1.0
[INFO] finished tweaking crates.io crate ecfft 0.1.0
[INFO] tweaked toml for crates.io crate ecfft 0.1.0 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate ecfft 0.1.0 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 ecfft 0.1.0 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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] fb193fd0867eba1b7617c6d4b007d7eb06764b689e4f009a312de345a2706999
[INFO] running `Command { std: "docker" "start" "-a" "fb193fd0867eba1b7617c6d4b007d7eb06764b689e4f009a312de345a2706999", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fb193fd0867eba1b7617c6d4b007d7eb06764b689e4f009a312de345a2706999", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb193fd0867eba1b7617c6d4b007d7eb06764b689e4f009a312de345a2706999", kill_on_drop: false }`
[INFO] [stdout] fb193fd0867eba1b7617c6d4b007d7eb06764b689e4f009a312de345a2706999
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 78f4c87cc4a19ce03e8970e690e93d602b5b4257b5dd038854fc301b37b44c1d
[INFO] running `Command { std: "docker" "start" "-a" "78f4c87cc4a19ce03e8970e690e93d602b5b4257b5dd038854fc301b37b44c1d", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.144
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling num-bigint v0.4.3
[INFO] [stderr]    Compiling ahash v0.8.3
[INFO] [stderr]    Compiling once_cell v1.17.1
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling crypto-common v0.1.6
[INFO] [stderr]    Compiling syn v2.0.16
[INFO] [stderr]    Compiling digest v0.10.6
[INFO] [stderr]    Compiling hashbrown v0.13.2
[INFO] [stderr]    Compiling getrandom v0.2.9
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling ark-std v0.4.0
[INFO] [stderr]    Compiling zeroize_derive v1.4.2
[INFO] [stderr]    Compiling zeroize v1.6.0
[INFO] [stderr]    Compiling ark-serialize-derive v0.4.2
[INFO] [stderr]    Compiling ark-ff-macros v0.4.2
[INFO] [stderr]    Compiling ark-ff-asm v0.4.2
[INFO] [stderr]    Compiling derivative v2.2.0
[INFO] [stderr]    Compiling ark-serialize v0.4.2
[INFO] [stderr]    Compiling ark-ff v0.4.2
[INFO] [stderr]    Compiling ark-poly v0.4.2
[INFO] [stderr]    Compiling ark-ff-optimized v0.4.1
[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/ark-ff-optimized-0.4.1/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(const_mut_refs, const_trait_impl)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `const_mut_refs` has been stable since `1.83.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ark-ff-optimized` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "78f4c87cc4a19ce03e8970e690e93d602b5b4257b5dd038854fc301b37b44c1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "78f4c87cc4a19ce03e8970e690e93d602b5b4257b5dd038854fc301b37b44c1d", kill_on_drop: false }`
[INFO] [stdout] 78f4c87cc4a19ce03e8970e690e93d602b5b4257b5dd038854fc301b37b44c1d